December 8, 2005 PURCHASE AND SALE AGREEMENT NATIONAL-OILWELL, L.P. AND UNION DRILLING INC. This Purchase and Sale Agreement is made and entered this 8th day of December, 2005 between Union Drilling Inc. (UDI) with offices at South Pittsburgh...

[NATIONAL OILWELL VARCO LOGO]

December 8, 2005

PURCHASE AND SALE AGREEMENT
NATIONAL-OILWELL, L.P. AND UNION DRILLING INC.

This Purchase and Sale Agreement is made and entered this 8th day of
December, 2005 between Union Drilling Inc. (UDI) with offices at South
Pittsburgh Technology Park, ▇▇▇▇ ▇▇▇▇▇▇▇▇▇▇ ▇▇▇▇, ▇▇▇▇▇▇▇▇▇▇▇, ▇▇ ▇▇▇▇▇ and
National-Oilwell, L.P. ("NOV"), with offices at 10000 Richmond, ▇▇▇▇▇▇▇, ▇▇▇▇▇
▇▇▇▇▇. In consideration of the mutual promises, covenants and agreements
hereinafter set forth, the parties mutually agree as set forth below:

AGREEMENT:

The parties agree to include the following terms:

1. UDI hereby agrees to purchase rig equipment for three (3) Ideal Rigs
from NOV, with an option to purchase three (3) more rigs. Such
equipment is described in NOV's quotation number NOI-10977-DWK Rev 1
and shall be purchased in accordance with the prices set forth therein.
The option rigs are described in quotation number NOI-11283-DWK dated
12/02/05.

2. Pursuant to the terms and conditions of the Letter of Intent ("LOI")
executed by the parties on November 7,2005, UDI provided NOV with a
initial deposit of $250,000.00 to secure the construction slots for the
three (3) Ideal Rigs. Upon execution of this Purchase and Sale
Agreement, the initial deposit shall be applied to UDI's total down
payment costs.

3. UDI further agrees to remit to NOV a thirty percent (30%) down payment
based on the total contract price for all rigs.

4. Delivery of the equipment is subject to Ex-works, NOV's facility -
Houston (INCOTERMS 2000 Edition), subject to further tax implementation
and clarification.

5. The delivery date of the first rig is scheduled for March 30, 2006. The
second rig will be delivered on May 15,2006, and the third rig will be
delivered on June 30, 2006.

6. A second milestone payment of 50% of the total contract price for each
rig shall be made by UDI to NOV upon completion of the "Rig Up" of each
rig. For clarification, "Rig-Up" shall be considered complete when both
parties agree and/or verify that 85% of all components required per the
quotation are in place and assembled within the drilling unit.

7. A third milestone payment of 20% of the total contract price for each
rig shall be made by UDI to NOV upon completion of the factory
acceptance tests.

8. The parties agree that the equipment and services provided under this
Purchase and Sale Agreement shall be governed by NOV's standard terms
and conditions included in its quotation number NOI-10977-DWK Rev.1.
and which are hereby incorporated herein.

Attachment 1: Standard Terms & Conditions
Attachment 2:

IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be duly
executed by their duly authorized representatives on the date first above
written.

NATIONAL-OILWELL, L.P. UNION DRILLING COMPANY

/s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇▇ /s/ J. ▇▇▇▇▇▇▇ ▇▇▇▇▇
--------------------- ---------------------
▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇▇ J. ▇▇▇▇▇▇▇ ▇▇▇▇▇
V.P. Sales and Marketing Executive V.P./Operations

[NATIONAL OILWELL VARCO LOGO]

December 8, 2005

SPECIAL CONDITIONS
------------------

The parties agree that these Special Conditions shall apply and supersede any
corresponding terms in NOV's Standard Terms & Conditions. All other provisions
in NOV's Standard terms and conditions remain "as is".

Proposed Indemnity Provision for UDI's Agreement with NOV to Purchase "Ideal"
Drilling Rigs.

o NOV represents to UDI that NOV's Ideal Rig does not violate or infringe
the patent or intellectual property right of any person and the sale of
the Ideal Rigs to, and the purchase or use of the Ideal Rigs by, UDI
will not violate or constitute an infringement or breach of any such
rights. In the event that a claim is made against NOV or UDI for the
sale or use of the Ideal Rig, NOV agrees to the following:

o NOV AGREES TO INDEMNIFY, DEFEND AND HOLD UDI AND ITS OFFICERS,
DIRECTORS AND AFFILIATES HARMLESS FROM AND AGAINST ALL LOSSES, CLAIMS,
LIABILITIES, DAMAGES AND EXPENSE (INCLUDING REASONABLE ATTORNEY'S FEES)
ARISING OUT OF OR BASED ON ANY BREACH OF THE FOREGOING REPRESENTATION
AND WARRANTY, AND IN THE EVENT THAT A THIRD PARTY'S CLAIMS INVOLVES
CLAIMS FOR RELIEF OTHER THAN THE MONETARY DAMAGES SUCH AS ENJOINING OR
SEEKING TO PREVENT THE USE OF THE IDEAL RIG OR ANY PORTION THEREOF BY
UDI, NOV'S INDEMNITY SHALL INCLUDE, PROMPTLY PROVIDING TO UDI, at NOV's
election to either (I)SUBSTITUTE EQUIPMENT EQUIVALENT TO AN IDEAL RIG,
WHICH IS NOT SUBJECT TO SUCH A CLAIM AND IS OTHERWISE NON-INFRINGING,
or (ii) obtaining for UDI the right to use the Ideal Rig, or (iii)
modify the Ideal Rigs owned by UDI in a manner acceptable to UDI so it
becomes non-infringing, but are functionally equivalent, or (4) refund
the purchase price. The above are the sole and exclusive remedies with
respect to a violation of the above representation or warranty.

o Not withstanding anything contained herein to the contrary herein to
the contrary, neither party shall be liable for any indirect or
consequential damages sustained or alleged to have been sustained by
the other party under this agreement

NATIONAL-OILWELL, L.P. UNION DRILLING COMPANY

/s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇▇ /s/ J. ▇▇▇▇▇▇▇ ▇▇▇▇▇
-------------------------- ---------------------------
▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇▇ J. ▇▇▇▇▇▇▇ ▇▇▇▇▇
V.P. SALES AND MARKETING EXECUTIVE V.P./OPERATIONS

[NATIONAL OILWELL VARCO LOGO] PROPOSAL

NATIONAL OILWELL VARCO IDEAL 1500 RIG PACKAGE

PREPARED FOR:

UNION DRILLING

PROJECT:

NOI PROPOSAL REF:
NOI-10977-DWK REV. 01

10/20/05

THIS PROPOSAL IS SUBJECT TO OUR STANDARD AND
ANY SPECIAL TERMS AND CONDTIONS OF SALE.

OUR REFERENCE:
NOI-10977-DWK Rev. 01
YOUR REFERENCE:

UNION DRILLING

National Oilwell Varco is pleased to offer our equipment detailed in the
following proposal.

A minimum 30% non refundable down payment required at time of order, 50% at time
of Rig-Up with balance at time of shipment (ex-works). These prices are valid
for 30 days and will remain firm through delivery, subject to receipt of written
purchase order.

Deliveries of the Ideal Rig Packages are to be confirmed by Product Line Manager
at March 30, May 15, June 30 (ex-works, Houston Facility) based on Standard
Ideal Rig Packages, subject to prior sale. Delivery confirmation is base on
receipt of down payment no later than Oct. 28, 2005.

This quote is for standard production equipment and uses National Oilwell Varco
standard components. Third party and/or regulator agency requirements are not
considered part of standard production equipment and if required, may result in
increased costs.

This quote does not provide for, nor include documentation or third party
certification. Charges for such certification, if required, will be quoted upon
definition of your requirements

Thank you for considering National Oilwell Varco.

Best Regards,

Page 2 of 58

PROPOSAL CURRENCY: U.S. DOLLARS

1. IDEAL RIG 1500 $23,955,000.00

TOTAL $23,955,000.00

Page 3 of 58

1.1 IDEAL 1500 STANDARD RIG PACKAGE $23,955,000.00
QTY. 3 PKG IDEAL-1500
STANDARD IDEAL 1500 RIG PACKAGE

IDEAL(TM) RIG SYSTEM

The Ideal(TM) Rig, rated @ 1500 HP, can drill up to depths of 18,000
ft., encompassing a wide array of features and benefits.

Designed and manufactured to achieve extraordinary gains in drilling
efficiencies for light, safe and efficient rapid deployment.

Enhanced safety features including low-set drawworks. All assembly
labor is performed at ground level with more inherently safe assembly
techniques.

National Oilwell quality, reliability and support through National
Oilwell worldwide network of parts and service locations.

The IDEAL(TM) SYSTEM package comes complete with the following
equipment:

DRAWWORKS
FAST MOVING RIG
TRAVELING EQUIPMENT
ROTARY EQUIPMENT
ELECTRICAL POWER SYSTEM
MUD PUMPS
MUD SYSTEM
HIGH PRESSURE MUD PIPING
BOP CONTROL AND CLOSING SYSTEM
INSTRUMENTATION
AIR SYSTEM
FUEL SYSTEM
ELECTRICAL RIG-UP
MECHANICAL RIG-UP
MISCELLANEOUS EQUIPMENT

DRAWWORKS EQUIPMENT GROUP

Qty. 1 EA. JC50D

Page 4 of 58

All air and hydraulic to terminate at a bulkhead on the drawworks
skid. Panel will be remote mounted and provisions for fast moving
disconnects of supply lines to panel are designed into the
drawworks skid.

Qty. 1 EA. LS-DWWK-CONT
Drawworks Console
LS-NOW to provide standard panel with instrumentation and control
used when LS-NOW is integrating their drawworks and their vendor's
disc brake. All controls, motors, instrumentation, transformers,
electrical items 60 HZ. All instrumentation in imperial units, all
labels in English. Panel to will be integrated with the other rig
controls in the remote mounted at driller's position in the
Doghouse.

Qty. 1 EA. DS50-BC
Brake Cradle
For LS-NOW model DS50 eddy current brake installed on LS-NOW Model
JC50D Drawworks.

Qty. 1 EA. DS50
Auxiliary Electric Brake
LS-NOW DS50 Eddy Current Brake
o Rated brake torque 60.76 KNm
o Applicable drilling range 3500-5000m
o Max. exciting power 12 KW
o Exciting coil insulation class/No. H/4
o Cooling water flow rate 285L/min

Page 5 of 58

C/W one(1) 503 water cooling unit

Qty. 1 EA. DS50-MC
Mounting Charge
Mounting charge for LS-NOW DS50 auxiliary electrical brake.

Qty. 1 EA. MODEL 2025A-LS Brake Control System
National Oilwell Model 2025-A Primary Brake Control System, for
application with a Model 6032 Eddy Current Brake. The system shall
consist of the following:

o Model 59926, 2025-A With H20 Alarm
o Model 55858 Driller's Control Unit. (Intrinsically Safe)
o Model 55860 Power Selector Unit (Intrinsically Safe)
o ▇▇▇▇-▇▇-▇▇▇▇ Power Transformer, 3 Phase, 30 kVA,
60 Hz, 480 Volt AC Primary, 220 Volt AC Secondary
(Drip-Proof)

Qty. 1 EA. MODEL 2025A-MS Brake Water Cooling Monitor System
Baylor designed brake cooling water monitor system to monitor eddy
current brake cooling water flow and temperature and provide an
alarm for insufficient cooling water inlet flow rate and high
cooling water outlet water temperature. In the event of either low
cooling water flow or high cooling water temperature an alarm ▇▇▇▇
and red alarm and red alarm lamp will be activated.

The system consists of the following:

(2) Cooling water flow switches (intrinsically safe) (1) Cooling
water temperature switch (intrinsically safe) (1) Set installation
hardware (3) Installation/maintenance manuals

o Model 57064, Flow Switch
o Model 56236 Temp Sensor
o Model 59924 Brake Sensor Junction Box

Page 6 of 58

Qty. 2 EA. YZ08/YZ08A Drilling Motor - Drawworks Yongji YZ08/YZ08A
drilling motor.

SPECIFICATIONS
o Rated power: 800 KW
o Rated voltage: 750 V
o Rated current: 1150 A
o Rated speed: 970 RPM
o Rated torque 8033.7 N.m
o Max. current: 1600A
o Max. torque: 12206.4 N.m
o Exciting type series
o Insulation class H
o Cooling type: Air forced ventilation
o Ex-proof type: Air pressurization
o Weight: 3200 kg

FEATURES
o Self excited series field
o Single shaft extension with standard hub
o Pressurized connection box with bolts for connecting
armature & field cables
o High current, powerful torque and wide speed adjusting
range at constant power
o C/W blower driven by 15HP ex-proof AC motor, 460V, 60Hz
and 230V spacer heater.

Qty. 1 EA. CBS-1 Crown Block Saver
LS-NOW type Toggle Valve, adjustable support and air piping.

FEATURES
Safety shut off device to limit block travel, installed on
drawworks to actuate main drum brake when required travel is
reached.

FAST MOVING RIG

Qty. 1 EA. LS-IDEAL-1500

Page 7 of 58

Mast
o Mast 142' height x 750,000# hook load capacity, upper and
lower section. Crown, jib boom, ladder & racking board
included. Upper section to contain block and reserve line
spool while in transit, lower section to contain top
drive while in transit. Crown contains (5) 50" sheaves,
(1) 60" fast line sheave and (2) 42" deadline sheaves.
o Ramp/Rail style mast raising system includes truck
mounted mast alignment mechanism.
o Dual mast stand (API Monogrammed).

Substructure
o 25' slingshot substructure, hydraulic cylinder raising,
with pipe ramp and 3-stairs, bop handling rail.

Drawworks Master Skid W/ 2 Mast Raising Cylinders and Brakewater
Cooling Unit Reservoir, & Piping
o Skid contains integral brake water cooling unit
reservoir, brake water cooling pumps and piping are
mounted on the skid, the drawworks mounts on the skid,
the mast raising cylinders pin to and rest in cradles on
the skid when not in use.

(Mast and substructure API monogrammed.)

Qty. 1 EA. 2302043
Hydraulic Power Unit
Self-contained skid mounted hydraulic power unit with two
hydraulic pumps. The first hydraulic pump is driven by a diesel
engine and the second hydraulic pump is driven by a
explosion-proof electric motor. Diesel engine and/or electric
motor driven hydraulic pumps can be used separately or
in-conjunction to power the hydraulic system

Dual Electric/Diesel Hydraulic Power Unit consisting of the
following:

Hydraulic Pumps:
(1) Variable displacement pressure compensated piston pump
(electric) Flow: 40GPM @ 1800 RPM Pressure: 3000 PSI

(1) Variable displacement pressure compensated through drive
tandem piston pumps (diesel)

Page 8 of 58

(2) Gear pump (Circulation pump)
Displacement: 2 CIR

Hydraulic Control Manifold and Components:
No Pressure Filter
(3) 20 SAE outlet ports
(4) 24 SAE return ports
(2) 0-5000 PSI pressure gauges

o Hydraulic reservoir stainless steel 60 US gallons with
all accessories.
o Diesel Fuel Tank Stainless steel 150 gallons with all
accessories
o Pump to motor adapters and coupling sets
o In tank return line filter housing and element 10 micron
absolute
o 3500 PSI relief valve (flanged mounted)
o Flange mounted check valves
o Hydraulic fan driven air to oil cooler
o Tank mounted suction filters for pump supply
o Low level and high temp shutdown

Diesel Motor:
o BF6L914
o 195HP @ 2300 RPM
o Air cooled 6 cylinder four stroke
o 12 volt starter
o SAE C pump adapter & drive plate

Electric Items:
(1) 75 HP 1800 RPM 365TC 460 volt C face (Class 1, Div 2 G-D)
(1) Remote stop/start station

Skid:
o A36 carbon steel skid
o Oilfield skid with roll-off ends
o Drip drain with drain valve

Assembly:
o All fittings and hose ends will be carbon steel.
o Label all connections, pressure and supply indication
points
o Sand blast and paint all components including the skid
o Assembly and testing of the HPU

Page 9 of 58

Qty. 1 EA. STDPIPE-1
4", 5000psi WP Standpipe

Qty. 1 EA. SPM-1
Standpipe Manifold
One (1) Single 4" standpipe manifold to connect to standpipe.

Manifold Consisting of:
o One (1) 4" 5,000# WP BW mud gate valve
o One (1) 2" 5,000# WP WN mud gate valve (kill, fill)
o Two (2) 4" fig 1002 hammer unions
o One (1) 2" connection for pressure gauge with 1002
hammer union
o One (1) 2" 1502 hammer union & wing nut connection for
pressure transducer.
o One (1) Pressure gauge 0-6000# 2" NPT connection
o Includes X-ray, hydrotest and paint.

Qty. 1 EA. VH-1 Vibrator Hose
Connects standpipe manifold to drill floor connection.

Qty. 2 EA. TWB-1 Tong Weight Box
Complete with pulleys and lines, LESS weight material.

Qty. 1 EA. 2300-0-EP
Safety Climbing Device
Mast ladder safety climb with three safety belts. Rope lock
2300-0-EP with 5/8" line.

Qty. 3 EA. CB-TS

Page 10 of 58

Qty. 1 EA. DLS-H-5000-1-3/8 Drill Line Spooler
Hydraulic Powered Drill Line Stand designed to accommodate steel
reel with 5000 Ft. 1-3/8" Drill Line.

Qty. 5000 FT 800091-1-3/8
1-3/8" Drilling line, 6X19, EIPS-PF-RI, IWRC

Qty. 1 EA. WC-D-BOPH Bop Beams
Trolley rail on Sub for hoisting and positioning BOP stack.

Qty. 1 EA. MR-CB-2CYLXHC
National Oilwell Two Cylinder Hydraulic Catworks
Hydraulic catworks mounted in mast. Individual hydraulic makeup &
breakout cylinders. Includes all wire line and all hydraulic
piping for the two cylinder catworks.

SPECIFICATIONS

o Breakout and Makeup Cylinders - 4" Bore x 8' Stroke
o Maximum Speed - 67' Per Min. at 35 GPM
o Maximum Pull - 20,000# at 2,000 PSI

Qty. 1 EA. Q250
Spinning Wrench, Q250
Air Spinner: 12cubic meters/min
Applicable Pipe: 3-1/2" - 10"
Norm Power: 16HP
Spinning Speed: 108-38 rpm
Spinning Torque: 1094-2500 NM

Qty. 1 EA. HYD-PIPING
Hydraulic Piping for Mast and Substructure
For mast and substructure raising/lowering and other hydraulic
functions (not including top drive).

Page 11 of 58

Drum is designed to rotate completely around the shaft during line
slipping.
(National Oilwell Dreco Exclusive)
Drum design includes a lead in groove to a smooth surface.
Rollers guide the line across the drum surface as the
drum rotates.

Designed and Manufactured to ▇▇▇ ▇▇, ▇▇▇-▇

For 1-3/8" Wireline size. Has double clamp for use with PVF
wireline. Have lugs for mounting to floor with two pins.

Model: LFLH-75-C-8C-R-PVF
Mounting: Lug Floor Mount
Orientation: Left Hand
Load Cell (Not Supplied): E-551 Compression Type
Maximum Deadline Load: 75,000 LBS. (34 mT)
Drum Diameter: 24" (609.6mm)
Approximate Weight: 2212 LBS. (1005 kg)
Coating: Three Coat Epoxy Paint System
Standard color: White

TRAVELING EQUIPMENT

Qty. 1 EA. YC450
LS-NOW Model YC450 Traveling Block

FEATURES
o Heavy steel fabricated main frame
o Heavy wireline guards
o Steel sheaves with induction hardened API wireline
grooves
o Tapered roller bearings in sheaves
o Oil quenched and tempered alloy steel shaft with
individual grease passages to each bearing
o High strength steel becket
o Designed to API standard 8A

SPECIFICATIONS

Page 12 of 58

Qty. 1 EA. DG450 LS-NOW model DG450 Hook

Complete with conventional bail, safety positioner, built in
hydraulic snubber and rotation lock.

Built to API 8A
Max. hook load: 4500KN
Overall dimensions (L x W x H mm): 2950 x 890 x 883
Weight: 3496kg

Qty. 1 EA. SL-450-5
Ls-National Oilwell Model Sl-450-5 Spinning Swivel

With spinning function.

Equipped with standard bails.

The wash pipe and packing assembly are cartridge type and can be
replaced on the floor without disconnecting the rotary hose and/or
gooseneck.

The gooseneck is provided with an outlet for wireline logging.

Equipped with 4" API hose connection.

Conforms to API specification 8A.

Maximum Static Load Rating 458.87 tonne (505.82 tons)
Maximum Speed 300 RPM
Maximum Working Pressure 35 MPa (5,000 PSI)

Page 13 of 58

Diameter of Stem 75 mm (2.95 in.)
Coupling Thread to Stem 7-5/8" Reg. LH
Coupling Thread to ▇▇▇▇▇ 6-5/8" Reg. LH

Manufactured in China at Lanzhou LS-National Oilwell Facility

o Spinner controls mounted at drillers position.

Qty. 1 PKG ▇▇-▇▇
▇▇▇ ▇▇▇ ▇▇▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇, size 108" API 8A.

ROTARY EQUIPMENT

Qty. 1 ZP-375
Lanzhou LS/National Oilwell 37-1/2" Rotary Table

o Built to API 7K
o Opening dia. 952.5 mm (37-1/2")
o Static load rating 5858 KN (1,300,000 lbs)
o Max. working torque 32362 Nm (23,900ft-lbs)
o Weight 7548 kg

Qty. 1 EA. IRD-LS-NOW
Independent rotary drive for LS-NOW ZP375 rotary table includes:

o Coupling, with Spacer, between Rotary and Transmission
o 2-Speed IRD Transmission (Roller Chain Type)
o Coupling between Transmission and DC Motor
o Inertia Brake for IRD Components

Above components to be assembled with rotary and motor (not
included) as one unit. Above modified to directly mount drive in
substructure.

Qty. 1
Full Guard, Included in Item. IRD-LS-NOW

Qty. 1 EA. YZ08/YZ08A

Page 14 of 58

Qty. 1 EA. D1636
Assembly of LS-NOW rotary drive components, motor & rotary table
into substructure.

Qty. 1 EA.
Master Bushing Bowl
LS-NOW split body pin drive master bushing for ZP375 rotary table,
complete with API No.3 bowl, lifting sling, and bit breaker plate
for ZP375 rotary table.

Qty. 1 EA.
Master Bushing Bowl
LS-NOW No. 2 Bowl for 10- 3/4" and 9 -5/8" Pipe.

Page 15 of 58

Qty. 1 EA.
Split Casing Bushing
LS-NOW 37-1/2" x 20" Split casing bushing for ▇▇-▇▇▇ ▇▇-▇/▇"
Rotary Table

Qty. 1 EA.
▇▇▇▇▇ Bushing
LS-NOW pin drive ▇▇▇▇▇▇ ▇▇▇▇▇ bushing for 5-1/4" HEX ▇▇▇▇▇

Qty. 1 EA.
Hex ▇▇▇▇▇
5-1/4"x40' hex. ▇▇▇▇▇. (5" Drill pipe), Drill Pipe connection
NC50- 4-1/2IF.

Qty. 1 EA.
Upper ▇▇▇▇▇ Valve
Mudanjiang Petro. machinery plant mode ▇▇▇▇▇▇▇▇ ▇▇▇-▇▇▇ ▇▇▇▇▇
▇▇▇▇▇, ▇-▇/▇" OD / 3-1/16" ID 6-5/8" reg LH (Upper)

ELECTRICAL POWER SYSTEM

Qty. 1 EA. 6715-00
SCR House
System Description

Item Qty Description
1 3 Detroit Diesel V-1600 engines driving a 1750 kVA,
600 VAC, 60 Hz generator.
2 1 1500 HP Drawworks, driven by two (2) series wound
Yongi DC motors.
3 2 1600 HP Mud Pumps, each driven by two (2) series
wound Yongi DC motors.
4 1 1000 HP Rotary Table driven by one (1) series
wound Yongi DC motor.

Page 16 of 58

National Oilwell to provide the following equipment
Item Qty Description
1 4 Model 1400 SCR control cubicles
2 3 Model 1400 Engine/Generator control cubicles
3 1 Blank cubicle for future Gen Control
4 1 Synchronizing system
5 1 Ground detection system
6 1 Hands off circuit
7 1 Power limit system
8 1 PLC System
9 1 Driller's console
10 1 Driller's foot throttle
11 1 Drawworks dynamic brake system
12 1 Baylor Brake Control
13 1 600 Volt feeder section
14 1 Transformer section
15 1 MCC section
16 1 Power Control House

1) MODEL 1400 SCR CONTROL CUBICLE
NOI will supply four (4) Model ▇▇▇▇ ▇▇▇ ▇▇▇▇▇ Control cubicles
each to include:
Item Qty Description
1 1 AC Input, ▇▇▇▇▇▇, ▇▇▇▇▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇
Breaker Switch with UV trip and auxiliary
contacts.
2 1 Voltmeter, 0 - 1000 VDC
3 1 Ammeter, 0 - 2000ADC
4 1 SCR "ON" indicating lamp, (Red)
5 1 6 pulse, 1800 amp, 750 VDC, vertical air
cooled SCR Bridge. The bridge shall be
protected using semiconductor type fuses
with form C contacts, which are activated
when the fuse opens.
6 1 Surge Suppression "ON" Indicating Lamp
(Green). Surge Suppression will be provided
to clamp any transient voltages, which could
be damaging to the SCR devices. The surge
suppressor will consist of a fused set of
metal oxide varistors (MOVs).
7 1 Set of DC assignment contactors to allow for
multiple assignments of the bridge.
8 1 DC Control Module with:
o Pulse thyristor-firing circuits with
"Hard Firing" outputs. The synchronizing
signal originates

Page 17 of 58

[NATIONAL OILWELL VARCO LOGO] Proposal
--------------------------------------------------------------------------------
Customer Name: UNION DRILLING Quote No: NOI-10977-DWK Rev. 01
Project Name: Date: 10/20/05
Cust Ref No:
--------------------------------------------------------------------------------
directly from the AC line so that no
pilot generator is required.
o High speed current regulator with
twenty-millisecond response. Automatic
current limit load sharing for motors
driving the same shaft and driven by
separate armature supplies no setup or
adjustment required.
o Individual control of current limit for
all drilling functions. The rotary table
torque limit will be mounted in the
driller's console.
o Ramp generator on the Drawworks current
regulator to control the rate of rise of
motor torque.
o Motor speed regulators for the Mud
Pumps, Drawworks, and Rotary Table (Top
Drive). Each regulator will be
interlocked with its related assignment
contactor.
o All controls are designed to be
"Foolproof", no preset sequence of
operation is required. The operator may
push any button at any time and the
system will either follow when it is
safe or block the command if it is not
consistent with the operation.
o Manual firing control for emergency
operation.
o Thyristor gate suppression at
approximately 150% of the bridge rating.
o "Zero Throttle Interlock", the hand
throttle must be returned to zero after
an assignment change before the motor
can be powered.
o Module Fault Finder includes a meter and
switch mounted on the front for
monitoring critical internal voltages

2) MODEL 1400 ENGINE/GENERATOR CONTROL CUBICLE
NOI will supply three (3) Model 1400 Generator Control
cubicles each to include:
Item Qty Description
1 1 ▇▇▇▇▇▇, ▇▇▇▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇▇ Breaker
with LI solid state trip unit, manually
charged, electric closing solenoid, UV
release and necessary auxiliary contacts.
2 1 Circuit Breaker Pushbutton "CLOSE"
3 1 Ammeter Meter
4 1 Kilowatt Meter
5 1 Kilovar Meter
6 1 Generator Hour Meter
7 1 Engine Control Pushbutton "OFF IDLE-RUN"

Page 18 of 58

[NATIONAL OILWELL VARCO LOGO] Proposal
--------------------------------------------------------------------------------
Customer Name: UNION DRILLING Quote No: NOI-10977-DWK Rev. 01
Project Name: Date: 10/20/05
Cust Ref No:
--------------------------------------------------------------------------------
8 1 Generator "RUN" Indicating Lamp (White)
9 1 Generator "ON LINE" Indicating Lamp (Red)
10 1 Generator Sync Indicating Lamp (Amber)
11 1 Manual Engine Speed Adjust Potentiometer
12 1 Manual Voltage Adjust Potentiometer
13 1 Engine Generator Solid State Control Module
with:
o Voltage Regulator
o Electronic Governor Control
- Response time of .8 second typical
- Maximum load unbalance between
engines (one hot, one cold) at all
points, no load to full load, +5%
of its rated load
- Working temperature range of
30(degree)C to +50(degree)C
- No load to full load regulation of
+1%
- Governor electronics arranged for
battery power to advance throttle
for "black start" capability.
o Reactive power is shared between the
generators by reactive power droop
compensation
o Real power is shared by a master / slave
command line
o Exciter power supply, 12 amp maximum
current (the exciter current limit is
set to suit the individual exciter)
o Exciter power supply maximum voltage is
240 volts (this is set by the choices of
the exciter transformer and the
generator self excitation requirements)
o Protective functions built into the
regulator are:
- Reverse Power Trip
- Under Frequency Trip
- Over voltage Trip
- Over speed Trip
- Frequency / Voltage Scheduled for
Engine Operation at Idle Speeds

3) BLANK CUBICLE FOR FUTURE GEN CONTROL
National Oilwell Varco will supply one (1) blank cubicle for
future Gen Control. This cubicle will

4) SYNCHRONIZING SYSTEM
NOI will supply a Synchronizing System that will consist of
the following items:
Item Qty Description
1 1 Synchronizing System

Page 19 of 58

5) GROUND DETECTION NETWORK
NOI will supply a Ground Detection Network consisting of the
following items:
Item Qty Description
1 1 Ground Detection Circuit
(3) - Ground Detection Lights
(1) - Percent DC Ground Meter
(1) - Percent AC Ground Meter
(1) - Test Pushbutton
(1) - Audible Alarm to be mounted on the
exterior of the house
(1) - Strobe Light to be mounted on the
exterior of the house
(1) - Alarm Acknowledge Pushbutton

6) HANDS-OFF CIRCUIT (HOC)
The HOC will supply power for the engine starting circuit and
the pulse pick-up circuit in each of the AC generator control
modules. The items included will be: Item Qty Description 1 1
Set of CPT's.
2 1 Set of fuses.
3 1 Single-phase diode bridge.
4 2 12V Batteries

7) POWER LIMIT SYSTEM
The Power Limit Circuit will monitor the KW & KVA of each
engine generator set. If either of these parameters reach its
limits, the Power Limit Circuit will reduce the power being
delivered to the loads so that the load on each generator is
held at its limit until the loads on the SCR drives are
reduced (by other action) to a level below the generator
limit. A meter on the Driller's Console indicates percent
Power Limit. A warning lamp is illuminated on the Driller's
Console at a load level just below the power limit.

Page 20 of 58

9) DRILLER'S CONSOLE
The console will be constructed of 12-gauge stainless steel
and the hand throttle wheels of solid stainless steel. Each
hand wheel will drive two (2) independent potentiometers to
provide 100% backup of the throttle function. The console will
be watertight and include a gasket type door. The console will
be equipped with purging for application in a Class I Division
2, Group D Hazardous area. A rig air supply fitting will be
provided for connection to an external 85 to 150 psi dry air
supply. An internal pressure regulator is included to maintain
a positive interior pressure relative to the ambient. NOI to
supply a driller's console with the following controls and
indicators:
Item Qty Description
1 1 SCR Assignment Switch
2 1 Rotary Table Speed Control
3 1 Rotary Table "FWD OFF REV"
4 1 Drawworks Speed Control
5 1 Drawworks Switch "FWD OFF REV"
6 2 Mud Pump Speed Controls
7 2 Mud Pump "ON-OFF" Switch
8 1 Rotary Table Torque Limit Selector Switch
9 1 Rotary Table Torque Meter Scaled for Amps
10 1 PLC "By-Pass" Switch
11 1 Power Limit Meter
12 3 Generator "ON" Lamps (Red)
13 4 SCR "ON" Lamps (Green)
14 1 Drawworks Blower "ON" Lamp (White) *
15 1 Rotary Table Blower "ON" Lamp (White) *
16 2 Mud Pump Blower "ON" Lamps (White) *

Page 21 of 58

10) DRILLER'S FOOT THROTTLE
The foot throttle is constructed of 12-gauge No.304 stainless
steel throughout, built to withstand the environment normally
encountered on the rig floor. It includes dual stainless steel
return springs to provide a fail safe return to the off
position in the event of a spring failure. Provisions for a
dry air connection to the electrical compartment are also
included. The foot throttle connects directly to the Driller's
console through a three-conductor cable.

11) DRAWWORKS DYNAMIC BRAKE SYSTEM
National Oilwell will provide a Drawworks Dynamic Brake
system. The dynamic brake will slow the Drawworks A motor from
full speed to some preset cathead speed within 10 to 15
seconds after the foot throttle is released. The power
generated by the freewheeling DC motor is fed into a stainless
steel grid resistor bank mounted out on the porch. During
normal operation of the Drawworks, the dynamic brake is not
connected. If at any time the motor speed is higher than the
DW throttle setting and the foot throttle is not in use, the
brake circuit will engage and reduce the motor speed to the
hand throttle setting.

12) BAYLOR BRAKE CONTROL SYSTEM
National Oilwell's Baylor Primary Brake control system, for
application with and eddy current brake. The system shall
consist of the following:
Item Qty Description
1 1 Air cooled 25 kW SCR unit with door mounted
alarm minimic panel (NEMA 1)
2 1 Driller's control unit (intrinsically safe)
3 1 Power selector unit (intrinsically safe)
4 1 Power transformer, 3 phase, 30 kVA, 60 Hz,
480 Volt AC primary, 220 Volt AC secondary
(Drip-proof)

Page 22 of 58

14) TRANSFORMERS
NOI will provide the following ventilated dry type
transformers:
Item Qty Description
1 1 1000 kVA, 600:480 Volt, 60 Hz, three phase,
aluminum wound, NEMA 3R enclosed MCC
transformer.

15) 480 VOLT MOTOR CONTROL CENTER
National Oilwell will provide the following vertical sections
of MCC. The MCC will be NEMA type, 480 Volt, 60 Hz, with
individual breakers. The horizontal bus will be copper and
suitably rated. The vertical bus will be copper and rated for
300 amps. A copper ground bus will run the full length of the
MCC line up. Each starter will be complete with a 480:120
control power transformer fused on the primary and secondary
(magnetic only) breaker, a contactor and an ambient
compensated overload element (heater).

LEGION: FVNR = Full Voltage Non-Reversing
HOA = Hands - Off - Automatic
3WRC = 3 Wire Remote Control
AF = Amp Frame
AT = Amp Trip
Item HP Size Type Control Function
1 1.5 1 FVNR HOA Mud Pump #1 Lube Oil Pump
2 3 1 FVNR HOA Mud Pump #1 Linear Wash Pump
3 15 2 FVNR HOA Mud Pump #1A ▇▇▇▇▇▇
▇ ▇▇ ▇ ▇▇▇▇ ▇▇▇ ▇▇▇ ▇▇▇▇ #1B ▇▇▇▇▇▇
▇ ▇▇ ▇ ▇▇▇▇ ▇▇▇ ▇▇▇ ▇▇▇▇ #1 Charging Pump
6 1.5 1 FVNR HOA Mud Pump #2 Lube Oil Pump
7 3 1 FVNR HOA Mud Pump #2 Linear Wash Pump
8 15 2 FVNR HOA Mud Pump #2 A ▇▇▇▇▇▇
▇ ▇▇ ▇ ▇▇▇▇ ▇▇▇ ▇▇▇ ▇▇▇▇ #2 B ▇▇▇▇▇▇
▇▇ ▇▇ ▇ ▇▇▇▇ ▇▇▇ ▇▇▇ ▇▇▇▇ #2 Charging Pump
11 15 2 FVNR HOA DWA Blower

Page 23 of 58

Feeder Circuit Breakers
Item AT/AF Function
1 150/150 Air Compressor #1
2 150/150 Air Compressor #2
3 150/150 Lighting transformer
4 100/100 Koomey Unit Pump #1
5 100/100 Spare
7 40/60 House AC #1
8 50/60 Baylor Brake Supply
9 30/30 HPU Disc Brake
10 40/60 House AC #2
11 150/150 Mud Tank Panel
12 50/60 Accumulator BOP
14 30/30 Spare
15 20/30 Dog House A/C Feeder
16 15/30 Dog House Purge Feeder
17 60/60 Spare
18 15/30 Block Heater #1

Page 24 of 58

16) POWER CONTROL HOUSE
The Power Control House will be designed for transportation by
an oilfield trailer. The house size will be approximately 10'
W x 46' L x 10'6" H.

The house columns and ceiling frame will be constructed from
structural steel seam welded. The outside shall be fabricated
from twelve-gauge sheet steel. All corners are to be formed by
bending leaving no sheet edge exposed.

Three of the walls will be insulated with three-inch thick
polystyrene block insulation. The floor and the wall with the
receptacles and plugs will not be insulated. The inside
surface of the walls will be finished with a sandwich style
insulating board with aluminum sheet interior. A rubber
neoprene mat will run the full length of the interior aisle of
the House.

One (1) 42 circuit 120Y208 volt, 3 phase, 4 wire panel board
will be mounted on an interior wall for lighting and other
required needs. Four (4) fluorescent lighting fixtures (2
40WRS) will be supplied for aisle lighting. Two (2) 120 volt
duplex receptacles will be included. An emergency lighting
fixture will also be included in the center interior of the
House.

Two (2) steel doors with panic hardware will be supplied, one
at each end and on opposite sides of the house. Both doors
shall be designed to open to the outside by pushing down on
the opening bar.

The two (2) air conditioning units will be of the split unit
type with the condenser and evaporator sections mounted
separately. Each unit will be rated at 7.5 tons. The hot air
generated by the SCR bridges will be discharged out the top of
the cubicles and contained within the dead air space between
the ceiling and the roof. This air will then be ducted to the
return air side of the evaporator sections of the units.
Transformers and air conditioning condenser units will be
mounted on a covered porch at one end of the house.

The incoming power connections will be located in a recessed
box located at the top and on one side of the house and spaced

Page 25 of 58

The exterior of the house will be cleaned with a sweep blast
of sand to remove scale and oxidation. The exterior coating
will consist of a sub coat of primer and a topcoat of urethane
linear white. The interior floor will be painted ANSI ▇▇▇▇.

Qty. 3 EA. R163-7M36 Generator Set

▇▇▇▇▇▇▇ & ▇▇▇▇▇▇▇▇▇ packaged Model R1630F900 generator sets, 600
volt, 3 phase, 60 Hz, 0.6 PF, 1800 RPM, equipped as follows:

Diesel Driver
o Detroit Diesel 16V2000/G80, Model R163-7M36
o 1350 BHP @ 1800 RPM, Prime Rated
o 16V configuration
o 4 stroke direct injected
o Bore and stroke 5.12 x 5.91 (130 x 150); 1944 CID (31.88L)
o Turbocharged (dual)
o Charge air cooled, SPCC
o SAE "0" flywheel housing
o Detroit Diesel Electronic Controls MDEC
o Provides engine monitoring and control
o Electronic (isochronous) governing
o Accessory Package
A. Instrumentation
o DDC Electronic Display Module. Provides engine monitoring
functions to include:
o Engine RPM
o Coolant temperature
o Oil pressure
o Battery voltage
o Diagnostic function
o Engine hours
o Overspeed shutdown. Independent of electronic controls.
o Magnetic pick-up

Page 26 of 58

B. Air cleaner. Dual dry type for standard service, mounted with
pre-cleaner caps.

C. Lubricating System
o Filter, replaceable spin-on.
o Gear driven oil pump.
o Angularity limits: 30(degree) Front up/down, 30(degree)
side tilt.
o Integral oil cooler

D. Fuel System
o Racor filter/moisture separator with replaceable element.
o DDC secondary filter, replaceable spin-on
o MDEC Electronic Unit Injector (EUI)

E. Start System
o Air starter, ▇▇▇▇ housing mounted, complete with actuator
valve and filter.

F. Electrical System
o Dual 12V HD batteries, mounted, marine boxes
o Engine driven 24V alternator, 70 amp (battery and
alternator package may be deleted if 24V power available
from others for electronic engine controls)
o MDEC wiring harness
o DDC Electronic Computer Module (ECU), mounted

G. Cooling System
o Radiator, front mounted, engine driven blower type fan,
separate Circuit Charge Cooling (SCCC) equipped with dual
cores
o Separate Circuit Charge Air Cooling (SCCC) engine
systems.
o Jacket water heater, 110/220V
o 115(degree)F ambient sizing

H. Exhaust System
o Exhaust wye, dual 8" inlet, 12" outlet
o Exhaust silencer, spark arresting, loose
o 12" inlet, 12" outlet
o Rain proof style stove pipe
o Two (2) 90(degree) exhaust elbows, 12" flange, two (2)
12" companion

Page 27 of 58

Generator
o National Oilwell 1750 KVA NOI/Baylor alternator, single
bearing for direct mounting to 16V2000, "0" housing, 1800
RPM.

EXPANDED DESCRIPTION BELOW

Construction
o Engine, generator, radiator assemblies unitized on heavy
duty structural steel. Accessory packages installed and
mounted unless noted as loose.
o Oil and fuel lines extended and fastened to base side
rails for convenient service and quick connection.
o Dimensions - 198" L x 75"W; Weight - 24,500 lb. -
Estimate

Manuals, Documentation, Testing
o Operation and Maintenance Manuals (2 copies each unit)
o Generator test reports
o Detroit Diesel Corporation dynamometer test reports
o Stewart & ▇▇▇▇▇▇▇▇▇ Standard Manufacturers test

GENERATOR
Model: S437QUJ
National Oilwell Baylor AC Generator with direct connected
brushless rotating exciter in accordance with the following:

o RPM: 800
o Electrical Rating 1050kW, ▇.▇▇▇, ▇▇▇▇▇▇▇, ▇▇▇, ▇▇▇▇,
600V, Wye
o Temperature Rise 105(degree) C by resistance over
40(degree) C ambient
o Duty Continuous SCR
o Insulation Class H form wound - VPI
o Enclosure Drip proof guarded
o Weight Approximate 9,500 lbs.
o Bearings One anti-friction, grease
lubricated
o RTD's 6 X PT100 in stator, 1 X
PT100 in bearing
o Excitation Brushless - shaft mounted
o Housing Adapter SAE "0"
o Drive Disc SAE 518
o Accessories:
o Oversized terminal box with bus bars

Page 28 of 58

Qty. 1 LOT 16V2000-HOUSE-3
Generator House
Engine/generator enclosure for three (3) Detroit Diesel 16V2000
power sets consisting of:

o Three (3) 10' x 40' Three runner oilfield type skids.
Skids constructed of W18" beam with 1/4" checkered plate
flooring.
o Three (3) 10' x 38' long roofs (10' clear height). Roofs
corrugated panel metal construction.
o Installation for three (3) National Oilwell furnished
mufflers and flex joints.
o One (1) fuel feed manifold with supply line to generator
set each skid.
o One (1) fuel return manifold with return line to
generator set each skid.
o Install following National Oilwell furnished equipment on
skid extensions:
o Two (2) Air Compressors
o Two (2) Air Receivers
o One (1) Air Dryer 400 ACFM Unit size (OR two (2) Air
dryers 200 ACFM size)
o One (1) Cold Start Unit

Provide piping between air compressors and air receiver and to
engine starters.

MUD PUMPS

Qty. 2 EA. 12-P-160
NOI model 12-P-160 mud pump, triplex single acting.

SPECIFICATIONS

Max. input horsepower 1600HP(1193KW)
Rated pump speed 120SPM
Piston stroke 12"
Max. working pressure 5000psi
Max. liner bore 7-1/4"
Suction connection flange 10"ASA-150lb.▇.▇.
Discharge connection flange 6" API-5000lb.▇.▇.
Dimension 5309L x 2889W x 1905H

Page 29 of 58

FEATURES
o One-piece construction of crank-shaft, connecting rod and
pinion shaft
o Roller bearing throughout
o Two-piece piston rod allows removal of piston without
disturbing liner
o Clamp lock liners and piston rod assemblies in place
o Full circle spray cools and lubricates liners regardless
of pump speed
o Metal to metal liner retention
o Herringbone gears
o Two piece cylinder modules with complete
interchangeability between modules
o "Fast Change" valve cover arrangement
o Liner Spray & motor 60HZ.
o Dress pump with 6-1/2" liners & pistons.
o Standard lube system

Qty. 2 EA.
Discharge Strainer Cross, complete with:
o 5" 5000# discharge flange connections
o 4" 5000# top connection for pulsation dampener
o 5" 5000# end connection for strainer clean-out

Qty. 2 EA.
▇▇▇▇▇▇, ▇-▇/▇" ▇▇▇▇# ▇▇▇▇▇ flange, to match 2-1/16" gauge.

Qty. 4 EA.
Flange, 5-1/8" 5000# API 6B Weld neck flange.

Qty. 2 EA.
Blind Flange, 5-1/8" 5000# Mod. 6B blind flange.

Qty. 8 EA. Ring Joint Gasket.

Qty. 2 EA.
Jib Crane with Trolley only For a 12-P-160 Mud Pump, for handling
fluid end expendable parts (only)

Qty. 2 EA.
1/2 ton hand hoist for use with Jib Crane

Page 30 of 58

Qty. 2 EA. 1292369
Oilwell In-Line Suction Stabilizer for 12-P-160 Pump application.

Qty. 2 EA. LS-20-5000 LS pulsation dampener.

Maximum service pressure 5,000 PSI
Surge capacity: 20 gallons
Connection: 4" API 5,000 RTJ
Diaphragm: Hydrogenated nitrile (installed)

Qty. 2 EA.
Pump Drive
For 12-160-P mud pump with:

o Extended skid frame
o Rear mounted dual belt drive
o Complete with sheaves, hubs, powerband
o Belt guard

For use with YZ08/YZ08A motor

Qty. 2 EA.
Assembly Of Drive To Pump
Assembly and mounting of motor and drive on 12-P-160 pump

Qty. 4 EA. YZ08/YZ08A Motor - Pumps
Yongji YZ08/YZ08A drilling motor.

Page 31 of 58

FEATURES
o Self excited series field
o Single shaft extension with standard hub
Pressurized connection box with bolts for connecting
armature & field cables
o High current, powerful torque and wide speed adjusting
range at constant power
o C/W blower driven by 15HP ex-proof AC motor, 460V, 60Hz
and 230V spacer heater.

MUD SYSTEM

Qty. 1 EA. MS-2T-1314BBL
Mud Tank System - Two Tank, Total Capacity of 1314 BBL /
Patent Pending

SHAKER TANK GENERAL DESCRIPTION:
1. To be equipped with the Following Equipment:
▇. ▇▇▇▇▇▇ ▇▇▇▇ Cobra Linear Motion Shale Shaker utilizes
a Cobra Linear Motion screen deck containing four
screens and 33.4 sq. ft. screening area and the
contour plus deck design with drying panel.
Screen area: 33.4 sq. ft., flat screens
Screens/deck: four screens
Screen angle: contour deck design 0(degree),
+5(degree), +5(degree), +5(0)
Deck angle: adjustable from -5(degree) to
+3(degree)
"G" force: nominal 6.3 G's
Electrical: direct drive, two 2.5 hp
canister vibra motors, 60 Hz,
230/460 volt, 3 phase,
explosion proof
Overall dimensions:
Length: 120"
Width: 65"
Height: 69"
▇▇▇▇ height: 41"
Weight: 4300 lbs.
(Screens are not included with shaker) - Left hand
▇. ▇▇▇▇▇▇ ▇▇▇▇ Cobra Linear Motion Shale Shaker utilizes
a

Page 32 of 58

[NATIONAL OILWELL VARCO LOGO] Proposal
--------------------------------------------------------------------------------
Customer Name: UNION DRILLING Quote No: NOI-10977-DWK Rev. 01
Project Name: Date: 10/20/05
Cust Ref No:
--------------------------------------------------------------------------------
Cobra Linear Motion screen deck containing four
screens and 33.4 sq. ft. screening area and the
contour plus deck design with drying panel.
Screen area: 33.4 sq. ft., flat screens
Screens/deck: four screens
Screen angle: contour deck design 0(degree),
+5(degree), +5(degree), +5(0)
Deck angle: adjustable from -5(degree) to
+3(degree)
"G" force: nominal 6.3 G's
Electrical: direct drive, two 2.5 hp
canister vibra motors, 60 Hz,
230/460 volt, 3 phase,
explosion proof
Overall dimensions:
Length: 120"
Width: 65"
Height: 69"
▇▇▇▇ height: 41"
Weight: 4300 lbs.
(Screens are not included with shaker) - right hand
C. One (1) Degasser Model D-1000-C, vertical vacuum
degasser with 60" diameter vessel mounted on an
oilfield skid. includes explosion proof 1800 rpm 5 hp
motor and starter, suction and discharge piping, and
jet nozzle with 1-3/4" bore.
Maximum capacity: 1000 gpm.
Electrical service: xp 3 phase 230/460v/60Hz.
D. One (1) Desander Vertical Model DSN-3V-10CTX, 3 cone
features manifold constructed of 8" sch. 40 pipe
mounted on an angle iron base, three (3) 10" diameter
CTX desander with grooved end inlet and overflow,
desilting capacity of 1500 gpm.
E. One (1) Desilter Model DSLR-20GG-4CTX, 20 cone
features 24" round manifold constructed of 3/8" plate
mounted on an angle iron base, twenty (20) 4" CTX
cones with grooved end inlet and overflow, desilting
capacity of 1300 gpm.
F. One (1) Vertical Centrifugal Pump Model
67065408ITAD0DS, degasser feed/clean out centrifugal
6x5x14 14" impeller 1150rpm 60hp vertical centrifugal
pump w/dual mech. seals @18 ppg mud.
G. One (1) Vertical Centrifugal Pump Model
670861516IT70DS, desander feed/clean out centrifugal
8x6x11 11" impeller 1750rpm 100hp vertical
centrifugal pump w/dual mech. seals @14 ppg mud.
H. One (1) Vertical Centrifugal Pump Model
67861516IT70DS, desilter feed/clean out centrifugal
8x6x14 14" impeller 1750rpm 100hp vertical
centrifugal pump w/dual mech. seals

Page 33 of 58

2. Shaker Tank Overall Dimension Is 55-0' Long X 12-0" Wide.

3. Tank will be as follows: (52' 9" long x 10-0' wide x 8'
6" high walls)
A. One (1) settling tank (sand trap) double slopped floor
114.923bbls
B. One (1) degasser tank 151.696bbls
C. One (1) desander tank 120.608bbls
D. One (1) desilter tank 120.608bbls
E. One (1) reserve tank #1 161.156

4. Shakers are mounted on two individual skids for fast
moving and to prevent having to have any fold up or down
walk around.

5. Walls and partitions are to be fabricated of crimped 1/4"
plate.

6. Flat bottom floors will be constructed of 3/8" plate.

7. Galvanized serrated grating will be installed over the
mud compartments, on walkways, on equipment platforms,
and on stairs.

8. Skid beams will be W12 X 45 PPF A36 for the main mud tank
skids.

9. The equipment skid to mount the degasser, desander, and
desilter is setting on the reserve side of the mud tank
with easy mount connection with no support members under
the skid to interfere with other equipment possibilities.
All 1-1/4 serrated grading will be mounted on the skid.

10. Rim line will be constructed of 6" square tubing with
1/2" wall thickness. The rig side of the rim used for
transferring mud and jetting each section to the reserve
side and displacing mud.

11. Rim line will be constructed of 6" square tubing with
1/2" wall

Page 34 of 58

12. Hinged manways with rung ladders will be installed in all
compartments.

13. All handrails will be constructed of 1-1/2" square tube
with 3/16" wall thickness and most of the handrails will
be designed to stay in place during shipment but lay down
to avoid having to rig them up each time.

14. Toe plates will be installed on the perimeter of tank
and/or walkway and surrounding the cuttings chute.

15. Handrails to be furnished around cuttings chute.

16. Butterfly dumps 10" to be installed in each compartment
off-rig side.

17. Shaker tank piped for one (1) desander, one (1) desilter
single source pumping, and each compartment will have
suction in a sump for transferring and jetting mud.

18. Discharge and suction piping will be kept below the
grating except where necessary to feed equipment.

19. Piping extensions higher than the mud agitators will be
connected with a union for quick rig up and rig down.

20. All piping up to 6" will be schedule 80 IPS.

21. All piping 8" and larger will be schedule 40 IPS

22. Mud trough will be sized for 1500gpm.

23. All pumps to be mission magnum with dual mechanical seals
intended for sucking the tanks dry.

24. All butterfly valves will have actuators below the
grating with socket adapter for manual operation.

25. Where possible butterfly valves to be outside mud tanks
and all butterfly valves are above mud level.

Page 35 of 58

27. Shaker tank piped for one (1) degasser, one (1) desander,
one (1) desilter, and each compartment will have suction
in a sump for transferring and jetting mud.

28. One (1) set of external stairs will be built for shaker
tank access with 42" handrails.

29. One (1) crossover platform from Shaker Tank to
Intermediate Tank #1.

SUCTION TANK GENERAL DESCRIPTION:
30. To equipped with the following equipment:
A. Two (2) Vertical Centrifugal Pumps Model
67065408ITAD0DS, charging mud pumps and feed/clean
out centrifugal 6x5x14, 14" impeller 1150rpm 60 hp
vertical centrifugal pump, w/ dual mech. Seals @18
ppg mud.
B. Two (2) Vertical Centrifugal Pumps Model
670654509IT0DS, mixing and feed/clean out centrifugal
6x5x14 75hp 1150rpm, vertical centrifugal pump, w/
dual mech. Seals @18 ppg mud
C. Four (4) Agitators 10hp Agitator Model MX-MA10-MTHC,
drill mud agitator with 30:1 helical gear speed
reducer, cast iron drop bearing housing for shaft
support, and 10 hp 1800 rpm explosion proof c-face
motor.
Includes shaft 84" long and impeller up to 36"
diameter and 49' diameter in suction #2 pitched blade
impeller.
Electrical service: xp 3 phase 230/460v/60Hz
D. One (1) Mud ▇▇▇▇▇▇ Model MH-6-WVT, MUD MIXING ▇▇▇▇▇▇
with venture tube ▇▇▇▇▇▇ mud 6" with venturi features
include venturi discharge nozzle, jet nozzle, sack
cutting table, and ▇▇▇▇▇▇ isolation valve.

31. Suction tank overall dimension 55' long x 12'-0 wide.

32. Tank will be as follows:
A. One (1) suction tank #2 232.275bbls
B. One (1) reserve tank #2 135.427bbls
C. One (1) suction tank #1 156.269bbls
D. One (1) premix (pill) tank 121.42bbls

33. Mud tank measurement 46'-3/4"long x 10-0" wide.

34. Walls and partitions are to be fabricated of crimped 1/4"
plate.

Page 36 of 58

35. Flat bottom floors will be constructed of 3/8" plate.

36. Galvanized serrated grating will be installed over the
mud compartments, on walkways, on equipment platforms,
and on stairs.

37. Diamond checkered thread plate will be installed on the
▇▇▇▇▇▇ floor and on the tank top over the ▇▇▇▇▇▇ porch.

38. Skid beams will be W12 X 45 PPF A36 for the main mud tank
skids.

39. Rim line will be constructed of 6" square tubing with
1/2" wall thickness. The rig side of the rim used for
transferring mud and jetting each section to the reserve
side and displacing mud. Hinged manways with rung ladders
will be installed in all compartments.

40. Rim line will be constructed of 6" square tubing with
1/2" wall thickness. The off-rig side of the rim used for
transferring water and 2" outlets provided for shaker,
desander and desilter, chemical mixing, and mud mixing
area.

41. All handrails will be constructed of 1-1/2" square tube
with 3/16" wall thickness and most of the handrails will
be designed to stay in place during shipment but lay down
to avoid having to rig them up each time.

42. Toe plates will be installed on the perimeter of tank
and/or walkways.

43. Butterfly dumps 10" to be installed in each compartment.

44. All pumps to be mission magnum with dual mechanical seals
intended for sucking the tanks dry.

45. Suction tank piped for one (1) mud ▇▇▇▇▇▇, two (2)
charging pumps, and each compartment will have suction in
a sump for transferring and jetting mud.

46. All piping up to 6" will be schedule 80 IPS.

47. All piping 8" and larger will be schedule 40 IPS

Page 37 of 58

49. Overflow and underflow pipes will be fitted with hammer
seal unions.

50. All butterfly valves will have actuators below the
grating with socket adapter for manual operation.

51. Where possible butterfly valves to be outside mud tanks
and all butterfly valves to be above mud level.

52. One set of stairs to tank will be built for the suction
tank access with 42" handrail.

Paint System:
Blasted and primed with epoxy inside and out and painted with
enamel hardener.

Qty. 1 1490413
Caustic Barrel
National Oilwell Caustic Barrel, telescoping.

Qty. 1 1490308
Mud Check Station
National Oilwell Mud Check Station with sink.

Qty. 1 EA. PBDG-48
Poor Boy Degasser
48" OD X 15 ft. long Poor Boy Degasser, skid mounted.
Skid suitable for also mounting optional choke kill manifold).
TO MOUNT ON COMMON SKID WITH TRIP TANK ASSEMBLY.

Qty. 1 EA.
Trip Tank Assembly
Trip tank assembly, skid mounted, constructed.

TO MOUNT ON SAME SKID AS POOR BOY DEGASSER.
(Two pump assemblies from below, to be mounted and piped on skid)

Qty. 1 EA.
Brake Water Cooling Unit
Brake water cooling unit. Cooling system consist of a water tank
integrated into the drawworks master skid, with piping, 3x2x13
circulating pumps, and a heat exchanger. Heat exchanger is cooled
with rig water.

Page 38 of 58

Qty. 4 EA. 323280081-2
Trip Tank & Water Transfer Pump
3x2x13 Mission Magnum I pump with 11" impeller, mechanical seal,
3ph, 60hz, 460V, 25 HP, explosion proof motor.

Elevation of cetnterline of assembly 15".

Standard two coat paint and top coated with RAL 7040 Grey.

Qty. 1 EA WT-400BBL Tank General Construction:
o 3 runner wide flange oilfield skid
o 3/8" flat plate bottom
o 1/4" v-crimp walls
o Open top design o 1/4" floor plate on skid extension
o Ladder rungs inside & out
o 4" drain with butterfly valve
o 10'-0" wide x 7'-0" deep x 32'-8" long mounted on a
42'-0" long skid- provision for transfer pumps located on
skid porch.
o 400 BBL Cap.

Qty. 2 EA. 61373-2
Brake Water Cooling Pump
3x2x13 Mission Magnum pump with 13" impeller, mechanical seal,
3ph, 60hz, 460V, 25 HP, explosion proof motor. Mounted on a low
profile channel base.

Elevation of centerline of assembly 12-15/16".

Standard two coat paint and top coated with RAL 7040 Grey.

HIGH PRESSURE MUD PIPING

High Pressure Mud Piping System
Qty. 1 EA.
The system will be fabricated by Changing as per NOI drawings.
Spec of valves.

o 4"-5000PSI W.P. gate valve
4" 5000psi buttweld mud gate valve for H2S.

Page 39 of 58

Qty. 3 PKG
4" X 12' X 5000 PSI WP Vibrator Hose
Vibrator Hose with FIG 1002 unions (male & female) and hose
hobbles (both ends) internal diameter 4".

Qty. 1 EA.
Rotary Hose
3-1/2" X 75 Ft.,10,000 PSI test, 5000 PSI Working Pressure with 4"
API Male threads each end with 4" Fig 1002 Union (Male X Female) &
Safety Clamp & Chain each end.

BOP CONTROL AND CLOSING SYSTEM

Qty. 1 EA. FKQ720-6 Remote Control Panel
Made by Beijing No.1 Petro. Pant, model FKQ720-6, consisting of:

REMOTE CONTROL PANEL

One (1) remote control panel include the following major
components unitized and mounted on an oilfield skid of heavy duty
welded steel construction:

a. One (1) 1290 liter (340 gallon) oil tank, complete with
1" drain plug, 2" air vent, internal baffles, electric
low level switch, sight glass gauge and four (4) 4" large
inspection port.
b. Twelve (12) 60 liter (15 gallon) capacity 21MPa (3000
psi) WP accumulators, which are arranged in both sides
and equipped with ball valve in any bank, bladder type
precharged with nitrogen gas. This vessel meets API
requirements. Accumulators are provided with ASME U-1A
certificates.
c. One (1) electric motor driven triplex pump, completes
with automatic pressure switch and relief valve. Pump
flow rate 43 liter/min. (11.4GPM) at 21MPa (3000psi)
output pressure. Explosion proof motor 18.5 kW. 3ph
460V/60 Hz.
d. Two (2) pneumatic pumps with capacity of 4.5 liter/min.
(1.2 GPM) and 21MPa (3000 psi) output pressure with a
0.53MPa air supply. The ratio of liquid/air is 60:1.
e. One (1) air supply manifold include air regulator,
lubricator, filter/separator, shutoff valve, bypass valve
and automatic

Page 40 of 58

1. Six (6) 1" manual/remote operated 3-pos./4-way control
valves for the controlling of:
Annular preventer (open/close)
Pipe ram preventer (open/close)
Blind preventer (open/close)
Pipe ram preventer (open/close)
Chock valve (open/close)
Kill valve (open/close)

2. Three (3) 100 mm OD pressure gauge for the following
pressure indication:

3. One (1) 1" 2-position, 4-way manual/remote operated
control valve for operation of the manifold pressure
bypass function.

g. Three (3) air transmitter for the remote indications of
the following pressure reading:
Accumulator pressure with 0~40MPa (0~5800 psi) range.
Manifold pressure with 0~40MPa (0~5800 psi) range.
Annular supply pressure with 0~25MPa (0~3570 psi)
range.

h. One (1) explosion proof electrical junction box include
pump motor starter/control, and all necessary elements.
In addition to this the junction box will include the
following indication lamps and switches:
One (1) switch for the following function:
Electric power on
Two (2) indication lamp for the following function:
Electric connection on (Red)
Electric power on (Green)
One (1) selector switch of the following function:
Electric pump HAND/OFF/AUTO

i. All other necessary gauges, check valves, bleed valves,
safety valves, fittings and connections for the proper
operation of the system.

Qty. 1 EA.
Drillers control panel suitable for control of the BOP stack. The
panel will consist of following main components:

Page 41 of 58

a. Seven (7) of 3-position, 4-way air operate valve, for the
remote operation of the following functions:

Annular preventer (Open/Close)
Pipe ram preventer (Open/Close)
Blind preventer (Open/Close)
Pipe ram preventer (Open/Close)
Choke valve (Open/Close)
Kill valve (Open/Close)
Manifold bypass valve (Open/Close)

b. One (1) set of air pressure regulator, for the remote
operation of the following function:
Annular air pressure (Increase /decrease)

c. Four (4) 100mm OD pressure gauge for the indication of
the following pressure readings:

Annular Pressure 0~25MPa (0~3570 psi) range
Accumulator Pressure 0~40MPa (0~5800 psi) range
Manifold Pressure 0~40MPa (0~5800 psi) range
Air Supply Pressure 0~2.5MPa(0~357 psi) range

Qty. 1 EA.
Auxiliary Panel

Graphic auxiliary drillers control panel suitable for control of
the BOP stack. The panel will consist of following main components
(can't indicate the position of open/close):

a. Seven (7) of 3-position, 4-way air operate valve, for the
remote operation of the following functions:

Annular preventer (Open/Close)
Pipe ram preventer (Open/Close)
Blind ram preventer (Open/Close)
Pipe ram preventer (Open/Close)
Choke Valve (Open/Close)
Backup Valve (Open/Close)
Manifold bypass valve (Open/Close)

b. Four (4) 100mm OD pressure gauge for the indication of
the following pressure readings:

Page 42 of 58

Qty. 1 EA.
Prevention house

Qty. 1 EA.
Alarm Device
This device can be equipped with alarm device when following case
occur, gives lamp and/or sound alarms, include a electric cable
connecting the control system and driller's panel, control system
and auxiliary panel. Remote control system and driller's panel ,
Cauxiliary panel are all equipped with 4 explosion-proof
indication lamp for the following function:

Low accumulator pressure (yellow, with sound alarm)
Low air pressure (yellow, with sound alarm)
Low fluid level (yellow, with sound alarm)
Electric pump running (green)

Qty. 5 EA.
Bop Closing System Pipe Rack Assembly
Pipe Rack Module made into 20 foot sections.

Each section consists of twelve (12) 1" extra heavy pipe with 1"
hammer lug unions on each end.

All pipe is covered with a walkway type grating.

Includes one (1) complete extra hammer union per pipe run.

Suitcase must be designed to accommodate all functions between bop
closing unit and the BOP. This would include all hydraulic, air &
electric.

(12) pipe required for six function BOP.

Qty. 24 EA.
1 Inch, 5000 PSI X 25 feet long "Firefighter" BOP Hoses with
Carbon steel male NPT end fittings.

(12) For connecting closing unit to pipe rack.
(12) For BOP

Page 43 of 58

INSTRUMENTATION

Qty. 1 SDI-50-1500HP-LAND
Smart Drilling Instrumentation For 1500 Hp Land Rig
The SDI-50 Smart Drilling Instrumentation System measures and
displays all critical drilling and mud parameters. The versatility
and flexibility offered by SDI-50 ensures that the system is ideal
for both land and offshore drilling units. It is designed as a
modern alternative to older instrumentation technology and it can
be easily configured to meet all of your current and future
drilling instrumentation needs. Information is presented in a
logical and ergonomic fashion in pages, which combine both
analogue and digital displays. Much emphasis has been placed on
ease of operation and as a result this user-friendly product
requires no special operator training.

Drillers Console is ergonomically designed. Manufactured with a
stainless steel frame and 304 stainless steel facia panels.
Console to house the SDI-50 Driller's Display Panel, Driller's
Meter Panel, KEMS with Autodriller and Weight Indicator. NOTE:
This console will reside in an overall console that includes SCR
and Drawworks Controls.

Installed in the driller's console. The driller's display panel
provides access to, and display of, all mud and drilling
parameters The unit is fully ruggedised for drill floor operation
Requires 110v AC 60Hz rig supply. The DDP features a 15" Active
Matrix Color LCD with 1024 x 768 Resolution XGA LCD screen with
minimum brightness of 400 cd/m2 to eliminate sunlight viewing
problems. Enclosure suitable for wall or console mounting 20kg
420(L)x200(W)x410(H)mm.

Signal Conditioning Unit.
Installed in safe area, this unit connects to the SDI-50 Displays
and provides intrinsically safe interfaces to the field sensors.
SCU typically configured as follows: 5 pit level/volume 4-20 mA
isolators, 3 pump SPM and Strokes, Tong Torque, Standpipe Press.,
RT RPM, RT Torque, all circuits have repeat outputs. 75 lbs.
15"(H)x15"(W)x10"(D). The SCU will be specifically configured to
suit the sensor inputs mentioned below.

SDI-50 Safe Area Workstation: For installation in the
Tool-Pusher's office. The computer Workstation provides the user
access to SDI-50 information configured with display software as
per the Drillers Display Panel. The Tool pusher's Workstation also
configured for this application as the server, to provide sensor
data to the Drillers Display

Page 44 of 58

Pentium 4 (2.4GHZ) Desktop PC with convertible mini tower with 17"
XVGA CRT Monitor, 40gig Hard Disk, 512 MB RAM, 48X-CD-RW, Win2000
Operating System & CP 5611 Profibus card with TB Server Software.

Driller Meter Panel: Provides additional analogue and digital
indication of the main drilling parameters on conventional
analogue meters and digital readouts. The operation of this panel
is independent of the DDP and as such it provides full display
redundancy. Configuration example based on the sensor options:
Stand-Pipe Pressure, Tong Torque, Rotary Table Torque, Rotary
Table RPM, Top Drive Torque, Top Drive RPM,2 Mud Pump SPM's and 2
Stroke Counters, Return Mud Flow and Trip Tank Level. Weight is
20kg; dimensions are 80(L) x 225(W) x 440(H) mm.

System includes:

1 1 304 Stainless steel Drillers Console to house
items 2, 3 & 5.
2 1 Weight Indicator (12" electric)
3 1 SDI-50 Drillers Display Panel
4 ▇ ▇▇▇-▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇▇▇▇▇▇▇▇ ▇▇▇▇ (▇▇▇▇ ▇▇▇▇).
5 1 SDI-50 Drillers Meter
6 1 SDI-50 Safe Area Workstation with Drill-Graph &
Drill-Log.
7 1 SDI-50 Power Conditioning & Distribution System.
8 1 Hook Load Sensor (EEx. Zone 1)
9 1 Standpipe Pressure Sensor (EEx. Zone 1)
10 2 Mud pump SPM sensor (EEx. Zone 1)
11 1 Rotary RPM sensor (EEx Zone 1)
12 1 Rotary torque sensor
13 1 Return mud flow sensor (EEx Zone 1)
14 1 Tong torque sensor (EEx Zone 1)
15 1 Height/Depth/ROP sensor (EEx)
16 7 Mud Pit level transmitters (EEx Zone 1)
17 1 Trip tank level sensor, 8.2 ft measuring level
and 9.52 ft overall length (EEx Zone 1)

Page 45 of 58

Submit types of offered sensors with ranges.

1. Hook Load Sensor (EEx Zone 1). Solid state, strain gauge
pressure transmitter, 4 to 20 mA. Range 0 to 1080 PSI to
suit deadline sensator.
2. Mud pressure sensor (EEx Zone 1). Solid state, strain
gauge pressure transmitter, 4 to 20 mA. Range 0 to 5000
PSI.
3. Mud pump SPM sensor 9EEx Zone 1). Inductive proximity
switch, NAMUR digital output.
4. Rotary/Top Drive RPM sensor (EEx Zone 1). Inductive
proximity switch, NAMUR digital output.
5. Rotary/Top Drive torque sensor. Split core current
transformer, 4 to 10 mA. Range and calibration nominally
0 to 1000 amps (Adjusted to suit rig).
6. Return Mud flow sensor (EEx Zone 1). Paddle flow sensor,
output signal is 4 to 20 mA. Range 0 to 100% RMF.
7. Tong torque sensor (EEx solid state, strain gauge
pressure transmitter, 4 to 20 mA. Range nominally 0 to
2000 PSI (Adjusted to suit rig).
8. Height/Depth sensor (EEx Zone 1). Digital shaft encoder
with quadrature output, 250 pulses per drawworks
resolution.
9. Mud Pit level transmitters (EEx Zone 1). Solid state,
ultrasonic level transmitter. Range nominal 0 to 5
meters. (adjusted to suit rig).

10. Trip tank level sensor. A float type IS level sensor
transmitter to provide a tank level signal to the SDI-50
DAQ. Sensor probe overall length = Measuring length - 452
mm (terminal hosing standoff). Please confirm No. of
pits, pit BBLs and probe length required when ordering.
11. Tension load cell 25k - for tong torque, utilizes item #7
for signal transmission.

Detail drawing for console to follow identification of customer
preferences. Console is custom designed to meet customer's needs.
Indicators and bar graphs are monitored on a flat screen TFT
monitor. Console is made from SS316 stainless steel.

Includes a power stabilizer. This unit takes whatever power the
rig give and provides stable AC & DC supplies for the entire
drilling instrumentation package.

The ROP is calculated on inputs from the drawworks encoder and the

Page 46 of 58

There is no need to have a 7 pen recorder. All measured parameters
are available as trends on the drillers display. Permanent print
out of any trend is also available at the block speed and the SDI
calculates the ROP. It is displayed on the flat screen TFT
monitor.

Qty. 1 EA.
KEMS with Automatic Drilling System
Kinetic Energy Monitoring System (KEMS-0006). The KEMS monitors
the load, speed and position of the traveling block and when
required operates the drawworks brakes, clutches and motors to
bring the traveling block to a controlled stop within preset
limits of travel. Interfaces are included for operation of the
drawworks auxiliary brake; main brake and clutches as well as the
drawworks drive motor/s. During downward travel, the system
measures the total hook load to determine a safe velocity profile
for downward motion. As the blocks descend and speed is gained,
the auxiliary brake is engaged to bring the block speed within the
safe velocity profile. This process continues until the block
comes to rest at, or just above, the bottom limit of travel.
However, should the auxiliary brake fail to control the descent as
requested, then the system will assume an auxiliary brake fault
and will immediately actuate the main brake in an effort to bring
the blocks to a controlled stop.

When traveling upwards the system assesses upward velocity and
hook load and, when required, will switch off the drive to the
drawworks motors and at the same time it shall apply, momentarily,
the Elmagco brake to bring the drawworks and traveling block
assembly to a standstill at, or just below, the upper limit of
travel. Just before the blocks come to a stop the main brake is
also set to prevent any subsequent, unwanted, downward motion.

The KEMS-0006 is a complete system hardware package and is
supplied with all materials, required to effect its installation,
including:

o Safe Area Signal Conditioning Unit
o Safe Area Power Supply Unit with Battery Back Up or
equivalent
o Intrinsically Safe Control Unit (specify stand alone or
console mount when ordering)
o Intrinsically Safe Spear Shaft (Drillers offside) mounted
Height Sensor.

Page 47 of 58

Automatic Driller: When installed this option provides the system
with the ability to control hook load, hence bit weight,
automatically. In operation the system compares the actual bit
weight to the desired bit weight releasing the drawworks brakes to
feed off drill line. As this happens any increase in bit weight is
compared to the corresponding movements of the drawworks drum. In
this way the system continuously monitors the relationship between
drawworks rotation (amount of drilling line feed) and the
subsequent transfer of weight from the hook to the bit. The
frequency and duration of the brake release cycle is then
controlled to provide optimum ROP while ensuring that bit weight
is kept at a constant level. The auto-driller does not require to
be tuned to match formation changes and drilling rate will
progress at the highest possible ROP.

Documentation:
o System Layout Drawing, DW/
o Electrical Interconnection Drawing, DW/
o General Arrangement Drawing(s), DW/
o System Operating Manual, OM/
o Ex Certification Data Book, CD/
o Calibration and Factory Test Reports, FT/

Qty. 1 EA. WL100 KINNECOR / LANTEC Wireline Winch

Stand mounted winch, with 5.5" dia. barrel, 16" dia. flange, 20"
long and cable dia .092" performance based on motor torque of
5,888 LB. IN. @ 68RPM:
Drum holds 34,800 T of cable on 57 layers. (outfitted with 25,000
ft, stainless steel line)

Bare drum line pull = 2,100 LB @ 100 FPM
Mid drum line pull = 990 LB @ 210 FPM
Full drum line pull = 740 @ 282 FPM

Page 48 of 58

AIR SYSTEM

Qty. 2 EA. HP75 Air Compressor ▇▇▇▇▇▇▇▇▇-▇▇▇▇ Model HP75 air
compressors

Type Oil flooded screw air compressor
Model 75 HP
Capacity 299CFM
Rated pressure 0PSI
Power supply 480V/60Hz/3Ph
Cooling method Air cooled
Ambient temperature <46(degree)C

SCOPE OF SUPPLY:
Air compressor mounted on air receiver, main electric motor,
modulation system, oil cooler, after cooler, air filter, oil
filter, water/gas separator, electrical control system, piping,
enclosure, etc.

Qty. 1 EA. LD-0.8/10 Cold Start Unit
Two-stage cold start compressor unit, belt drive, guard skid with
301 cc gasoline fuel engine.

Qty. 2 IR61D
▇▇▇▇▇▇▇▇▇-▇▇▇▇ Model IR61D air dryer.

o Model IR61D
o Capacity 7.5 M3/min.
o Max. inlet temperature 66(degree)C
o Filtering capability Oil 0.5ppm
o Particle size 1(micron)

Qty. 2 EA. VAR-53CF-PI
53CF vertical air receiver with ring base. The 400 gallon receiver
is ASME coded and stamped fro 165 PSIG working pressure. Finish is
factory standard.
36"OD x 98"L
Air Accessory Kit consist of
Pressure Relief Valve
Pressure Gauge
Automatic Drain

Qty. 1 EA.

Page 49 of 58

Air Accessory Kit consists of:
Pressure Relief Valve
Pressure Gauge
Automatic Drain

Qty. 2 EA.
Utility air winch. Five (5) ton capacity.

Qty. 1 EA. 8CF
8 c.f. horizontal air receiver, 60 gallon, ASME coded and stamped
to accept minimum 165 PSIG working pressure.

20" OD x 48" Length

FUEL SYSTEM

Qty. 1 LOT FT-400-BBL-CYL
Cylindrical fuel tank, having a 400 BBL capacity, saddle mounted
on a three runner skid with oilfield type skid ends for
tailboarding. Tank includes one 20" OD manway, ladder rungs inside
and out, one (1) 2" vent, one (1) 4" fill connection, and one (1)
4" drain and one (1) sight level gauge.

Skid extension decked with 1/4" checkered plate to accommodate
fuel transfer pump and one fuel filter.

Pump and filter quoted separately.

Qty. 1 EA. K-FF1081
National Oilwell/Halco Model FS-1081 Fuel Filter System
This filter package is a three-stage filter type. There is a
prefilter to remove dirt, a coalescer element to form dissolved
water into droplets and separator element to make the water
droplets drop out of the fuel.

PREFILTER:
Contains a quantity of three pleated paper filter elements each
rated to remove solids to five (5) microns. The three elements
will hold approximately twenty pounds of dirt before time to
change out the elements. The purpose of the prefilter is to trap
solids or dirt before they

Page 50 of 58

COALESCER:
Contains a quantity of two coalescer elements and two separator
elements. The purpose of the coalescer element is to separate the
water from the fuel by forming the water into droplets so that the
water will fall out of the fuel by gravity. The purpose of the
separator element is to repel any droplets that do not fall out of
the fuel. This tank has an automatic drain valve to let the
separated water out. This is what is commonly referred to as
two-stage separation. It is important to remember that even though
the coalescer and separator elements will remove dirt, their
primary function is to remove water. Rated to remove water to 5
parts per million or 99.999995%.

DIESEL FUEL TRANSFER PUMPS
Two packages each having a ▇▇▇▇▇ 2AM21 gear pumps with built in
relief valve, rated at 35-39 GPM mounted on a base with a flexible
coupling, OSHA coupling guard and a 3 HP, 1800RPM, explosion proof
motor, 230-460Volts, 3 phase, 60 cycle.

MOUNTING:
These two filter tanks along with the two pump packages are
mounted on a base, piped with valves for series flow through the
tanks or to bypass the filters. The pumps will be manifold
together so that product can flow through either pump while the
other pump is operating. Pressure gauges are mounted on each of
the tanks to measure pressure drop and know when to change
filters. The system will also include an automatic drain for
water, and all necessary valves, unions etc. to make it a complete
functional unit. The system only requires a hose from the main
fuel storage and a hose to the day tank. The total unit is painted
with a two-part catalyst setting epoxy.

ELECTRICAL RIG-UP

Electrical materials, supervision, electrical rig-up, welding, and
rig down.

LIGHTING SYSTEM - 120Volt 60 HZ

1. Mast, Racking Board, and Obstruction Lighting
2. Rig Floor - Drawworks Lighting
3. Pipe Rack and Area Lighting
4. Substructure Lighting
5. Mud Pump Lighting
6. Generator Skids

Page 51 of 58

All fixtures to be completed outfitted with plugs and receptacles,
cable

GENERATOR POWER AND CONTROL CABLES

1. A/C power and control cables to connect generators to SCR
House
2. Control cables for generators
3. Glastic plate for cable entrance @ generator
4. Cable Trays included

D.C. MOTOR POWER AND CONTROL CABLES

Mud Pumps Motors (4)
Drawworks Motors (2)
Rotary Table Motor (1)

1. Power and Control Cables

AC POWER AND CONTROL CABLES

1. (2) Mud Tanks are included
2. Cable tray's included

PLUG AND RECEPTACLE PANELS FURNISHED BY NOI

1. Plugs and receptacles furnished by Prime

A. Between Mud Pump 1 and Mud Pump 2 (4 motors)
B. For Mud Tanks & System
C. Grasshopper
D. (2) Water Tanks
E. 120 Volt Power BOP Closing
F. Swing out Booms on Water Tank
G. Mud Pump Boom

Page 52 of 58

RIG-UP SPECIFICATIONS

A. Cables supplied will be Polyrad XT 125 degree C type P
B. Electrical Rig-up will meet API standards
C. All connections to be weatherproof
D. Receptacles to have watertight covers
E. Grounding of skids included
F. Function Test & Support

ENGINEERING

A. As built drawings on a C.D. will be provided to NOI.

MECHANICAL RIG-UP

Qty. 1 LOT MRU-T-RD-1500
Rigup Test Rig Down

Qty. 1 LOT EL-CBLTRY-GRHPR
Cable Trays To Grasshopper

Qty. 1 EA. BN-1, ▇▇▇▇ Nipple

Qty. 1 FL-10, 10" Flow Line

Qty. 1 EA. Mousehole Scabbard Assembly

Qty. 1 EA. Rathole Assembly

MISCELLANEOUS EQUIPMENT

Qty. 1 EA. Drillers Dog House / Control Cabin
The driller's cabin is designed to provide the drilling operators
a safe and comfortable work environment. The cabin will be
suitable for the required area classification. Considerations made
include:

Environment
Considerations made include comfortable colors, low noise levels,
and high automation level this environment will enhance the
quality and the success of the drilling operations where critical
split-second decisions

Page 53 of 58

Ergonomics
The driller's cabin and other control panels are designed to make
the operator able to work long shifts without stress or strain.
The positioning of instruments and controls has been thoroughly
evaluated with regard to frequency of use, interrelation and ease
of operation and help reduce fatigue to the driller.

Classification
The driller's cabin will be rated for a Class 1 Division 2 area.
The protection means for this housing will be accomplished by
pressurization according to NFPA496 requirements.

Safety
Since most of the machinery operations are controlled from the
driller's cabin the safety will be enhanced considerably. There
will be two (2) escape route from the cabin. Protection bars and
netting on the sloped windows secure operators from falling/
moving objects. All windows are of 9/16" laminated, heat
strengthened safety glass.

Layout
From the driller's cabin the operator can control most of the
equipment used in the drilling process. Most controls used are
included in the drillers control console and are in easy reach of
the operators.

The driller's cabin is located on the drill floor and is designed
to have a clear line of sight to the operating machinery and
people on the drill floor.

The equipment/control panels in the driller's cabin will be placed
in the most visual / convenient position (fire /gas, drillers talk
back, etc.)Driller's cabin features: the cabin supply includes as
a minimum the equipment listed below:

Driller's cabin carbon steel enclosure with grey (RAL 7040).

Removable protection net attached to the protection bars on sloped
windows.

Insulated walls, roof and floor

Architectural items such as: wall panels, ceiling panels,
Floor cover, door and windows

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Junction boxes where required

Access to equipment in ceiling/floor the driller's cabin will have
available space for

The drillers cabin will have available space for the Typical
instrumentation / equipment as listed below:

DCC panel
Ex telephones
ESD pushbuttons
Talkback station
BOP panel
Choke panel
Fire / gas monitor / panel
Thermostat / pressurization monitoring system for HVAC the
driller's cabin is connected to an independent HVAC

The drillers cabin is connected to an independent HVAC system with
dual blowers and two independent power feeders.

The HVAC unit is located on the outside wall of the cabin.

The HVAC system supplies the necessary air to pressure the cabin
and maintain a safe working environment within the hazardous area.
The operator has the ability to see an HVAC common alarm on the
SDI screens if something should occur.

Qty. 1 SET YNG-CTWLK
One (1) section catwalk, 60" wide x 42" high x 49' long. Decked
with 1/2" plate for approximately 10' from the pipe ramp and 3/8"
plate for the remaining length.

Qty. 1 EA. WS 8 X 26 X 8
One (1) workshop. Workshop 26' long x8' wide with one personnel
door, one dual access door and one window.

Includes work bench, mechanics tool set and steel tool chest, and
drill press. Air conditioning/heating not included.

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Shipping dimensions: 8 ft. wide X 4 ft. high X 30 ft. long.
Weight: 12,000 lbs.

Qty. 1 Electrical Cable Handling System 5- Booms, 1 telescoping boom,
drag chain.
(3) Assembly mounts on water tank and one boom on each mud pump.

TOTAL $23,955,000.00

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All quotations and sales are FOB point of shipment unless otherwise specified on
the face hereof. Seller's responsibility ceases upon delivery to carrier and
title shall transfer and risk of lost goods shall be borne by Buyer at that
point. Any Hot Shot or other premium transportation charges requested by Buyer
will be for the account of Buyer. A minimum shipping and handling charge shall
apply on any order of less than $500.00. Prices are subject to adjustment to
reflect the Seller's prices in effect at time of shipment. No claims for price
adjustments will be honored unless presented within one year from date of
invoice. All quotations are subject to change without notice and to prior sale
of goods.

THERE ARE NO WARRANTIES WHICH EXTEND BEYOND THE DESCRIPTION ON THE FACE HEREOF.
THIS WARRANTY IS GIVEN EXPRESSLY AND IN PLACE OF ALL OTHER EXPRESS OR IMPLIED
WARRANTIES AND ALL IMPLIED WARRANTIES FOR MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE ARE DISCLAIMED.

Goods manufactured by others are sold "as is" except to the extent the
manufacturer honors any applicable warranty made by the manufacturer. Secondhand
goods are sold "as is". Leased goods, new or used, are leased "as is".

In the event any goods manufactured by Seller and furnished hereunder are found
to be defective or otherwise fail to conform to the conditions of this contract,
Seller will, at its option, either: (1) replace the goods at the delivery point
specified herein, (2) repair the goods, or (3) refund the purchase price.
Buyer's remedies with respect to goods manufactured by Seller and furnished
hereunder that are found to be defective or otherwise not in conformity with the
contract shall be limited exclusively to the right to have said goods replaced,
repaired, or to a refund of the purchase price, at Seller's option. Buyer's
remedies with respect to goods manufactured by others and furnished hereunder
that are found to be defective or otherwise not in conformity with the contract
are limited to any warranties extended and honored by the manufacturer. Buyer's
remedies are limited as aforesaid regardless of whether Buyer's claim is based
on principles of contract or tort. Claims must be made promptly following
delivery of the goods to the Buyer, but within one year from date of tender of
delivery. Seller must be given a reasonable opportunity to investigate. NEITHER
SELLER NOR THE MANUFACTURER SHALL HAVE ANY LIABILITY FOR SPECIAL, INDIRECT,
CONSEQUENTIAL, INCIDENTAL, OR OTHER CLAIMS FROM ANY BREACH OF CONTRACT OR TORT
COMMITTED BY SELLER OR THE MANUFACTURER OF GOODS RESOLD BY SELLER. Buyer agrees
that it is to be solely responsible for, and will hold Seller, and the
manufacturer of any goods resold by Seller, harmless from any claims, regardless
of their basis, by Buyer or third parties that may arise from the goods after
delivery, except for replacement, repair, or refund of the purchase price, at
Seller's option, for Seller manufactured goods or as provided in any warranties
extended and honored by the manufacturer on goods manufactured by others as
provided above. Seller's total cumulative liability in any way arising from or
pertaining to any products sold or required to be sold under this contract,
shall not in any case exceed the purchase price paid by Buyer for such product.

With respect to any work performed on goods furnished by Buyer (including but
not limited to repairing, welding, machining, fabricating, heat treating, and
forging) Seller agrees to make every effort to perform fully such work in
accordance with Buyer's specifications. Seller shall be responsible for damages
to such goods caused only by Seller's negligence, in which case Buyer's remedy
shall be limited exclusively to the price of the work to be performed by Seller
on the article damaged. Claims must be made promptly following delivery of the
goods to Buyer, but within three months from the date the same is put into
operation and, in any event, not more than one year after date of tender of
delivery. Seller must be given a reasonable opportunity to investigate. Seller
shall have no liability for special, indirect, consequential, incidental or
other damages arising from any breach of contract or tort.

All federal, state, dominion, provincial or municipal taxes now or hereafter
imposed in respect to the goods sold by the Seller and/or the processing,
manufacture, delivery, transportation and/or proceeds of the goods herein
specified shall be for the account of the Buyer and if taxes are required to be
paid by the Seller, the amount thereof shall be added to and become part of the
price payable by the Buyer.

Payment shall be made at par in legal tender of the United States of America.
Buyer shall make such arrangements for terms of payment as Seller's treasurer
shall from time to time require. All orders are subject to the continued review
of the Seller and if, in its opinion, the financial position of the Buyer has so
changed prior to delivery as to render the Seller insecure, the Seller may
suspend production and/or refuse to make delivery pending satisfactory
modification of the terms of payment. If in the event it becomes necessary to
place the account in the hands of an attorney for collection, Buyer agrees to
pay reasonable attorney's fees incurred by the Seller. Buyer shall pay interest
of 18% per annum for all accounts after the due date; provided, however in no
event shall Buyer be required to pay any amount beyond the maximum allowed by
law.

In the event of any delay in Seller's performance due to fire, explosion,
strike, shortage of utility, facility, material or labor, delay in
transportation, breakdown or accident, compliance with any other action taken to
carry out the intent or purpose of any law or regulation, or other causes beyond
Seller's control, Seller shall not be liable for any direct or indirect damage
or loss due to any such causes. Seller uses reasonable efforts to ship within
the time specified, but does not guarantee to do so and shall not be liable for
any damage caused by delay in delivery, irrespective of the cause of delay.

Any clause required to be included in a contract of this type by any applicable
law or administrative regulation having the effect of law shall be deemed to be
incorporated herein. It is hereby certified that the goods manufactured by
Seller are produced in accordance with the Fair Labor Standards Act.

No material may be returned to the Seller nor may orders be canceled or
specifications changed without first obtaining written permission of the Seller.

ADDITIONAL CONDITIONS APPLICABLE TO EXPORT SALES
------------------------------------------------

Seller will not provide any certification or other documentation nor agree to
any contract provision or otherwise act in any manner which may cause Seller to
be in violation of United States law, including but not limited to the Export
Administration Act of 1979 and regulations issued pursuant thereto. This
contract shall be construed in accordance with United States law.

Page 57 of 58

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December 8, 2005 PURCHASE AND SALE AGREEMENT NATIONAL-OILWELL, L.P. AND UNION DRILLING INC. This Purchase and Sale Agreement is made and entered this 8th day of December, 2005 between Union Drilling Inc. (UDI) with offices at South Pittsburgh...

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