200 Gilliiigiiam Laiie, MD7 Suyai Land. TX 77470

November 12,2007

4

United States Nuclear Regulatory Commission Region IV- Mater ia ls Inspection Branch 61 1 Ryan Plaza Drive, Suite 400 Arlington, Texas 7601 1

RE: Source Abandonment f o r EnCana Oil & Gas (USA), Inc.: Stud Horse Bu t te 57-22

Dear Sir o r Madam:

This letter is t o confirm the abandonment of irretrievable sources in a we l l in accordance with Part39, Section 39.77(d). Information fo r th is abandonment is attached.

If you have any questions or require additional information, please contac t me a t 281-285-7460.

Since rely,

&

Thomas S. W o o d Deputy Radiation Safety Officer Schlumberger Technology Corporation

Source Abandonment for EnCana Oi l & Gas (USA), Inc. Well: Stud Horse Butte 57-22

Date of Occurrence:

Source #1 Identification: Manufacturer: Model: Depth:

Source #2 Identification: M anufa ctu rer: Model: Depth:

Wel l Identification:

Seal Results:

Recovery Attempts:

Depth of Well:

Identification:

Reports:

Initial Telephone

October 27,2007

592 GBq (1.7 Ci), Am241 Be, Neutron Source, Serial #A2562 Gammatron, Inc.

8,770' NSR-F

63GBq (1.7 Ci), Cs 137, Density Source, Serial #A5176 AEA Technology, QSA

8,783' CDC.CY3 (GSR-J)

Company: EnCana Oil & Gas (USA), Inc. Well : Stud Horse Butt 57-22 Location: 1558' FSL & 424' FWL, Sec.22, T-29N, R- l08W Field: Jonah County: Sublette State: Wyoming API Number: 40 035 25205

Set 200'of 15.8 ppg Class G cement plug with red oxide dye from, -8,757' t o -8,572'. Set second cement plug (1 5.8 ppg Class G ) f rom -8,091 t o -7,623'. Set th i rd cement plug (1 5.8 ppg Class G) f rom -5,985' t o -5,885'. Set fourth cement plug (15.8 ppg Class G ) f rom -3,950'to -3,850'. Set fifth cement plug (15.8 ppg Class G ) f rom -2,600'to -2,464'. Placed a mechanical deflect ion device (7 7/8" t r i -cone drill b i t upside down) on top o f the cement plug a t -2,464'. Placed 10 sacks of cement on top of drill bit. Set sixth cement plug (15.8 ppg Class G ) f rom -1OO'to surface.

Mult ip le attempts f rom 10/20/07 t o 10/27/07

12,745' M D (4.7 O deviation)

Plaque as required by Part 39 ordered and will be at tached t o the well .

N o other agency will receive a copy of this report.

10/26/2007 @ 08:20 CST Contact: Chuck Cain - NRC Region IV

LEH-QT LEH-QT 2807

DTC-H ECH-KC DTCHO-A DTCH 1 -A

HI LTH-FTB HGNSD-H HMCA-H

NLS-KL HGNH

NSR-F2562 HACCZ-H 5873 HCNT-H HGR

GLS-VJ 51 76 MCFL Device-H HILT NucI. LS-H HILT NucI. SS-H HILT NucI. BS-H BOW-SPR

DOWNHOLE EQUIPMENT

CTEM

TelStatus ToolStatu

HGNS HTEM HMCA

HGNS Gamm

HGNS HGNS

28448 4276flGNS 26579

Neut Neut

sens

NPV-N

HRCC cart

MCFL HILT Cali

HRDD-LS HRDD-SS HRDD-BS

41T-M 4MIS-A 146 4MRM-A

Inl-Action Temperatu Power S u p

SP SENSOR DF

HTEN HMAS HV Accelerom Mud Resis

- 39.7

37.6 I - 37.6 - 36.9

U

- 31.1 __ 30.6

- 28.2

- 24.2

__ 17.9

MAXIMUM STRING DIAMETER 5.88 IN MEASUREMENTS RELATIVE TO TOOL ZERO

ALL LENGTHS IN FEET

43.6

40.6

37.6

16.0

1.0 IN Standoff

1.0 IN Standoff

Wellbore Diagram

Casing/ Hole Size

Cement Plug 100' to Surface

2,464 Top of Cement Plus

9 5/8" Csa @.? 2.501 '

2,600' Bottom of Plug

3,850' Top of Cement Pluc

3,950' Bottom of Plug

5,885' Top of Cement Plus

5,985' Bottom of Plug

7,623' Top of Cement Plu!

8,091' Bottom of Plug

8,572' Top of Cement Plu

8,757' Top of Tool

TD @ 12,745' MD

JOB REPORT

Company: Encana Well: Stud Horse Butte 57-22 Rig: Ensign 123 Service(s): PEX

Run 1: PEX

7.875” section: 20-Oct-2007

10/20/2007 06:OO Well was handed to SLB, safety meeting and rig up started.

10/20/2007 07:30 Operating time started: RIH with logging tools.

10/20/2007 09:30 Tagged bottom with logging tools (12760 FT) and started to log up. Experienced several tight pulls and had to close the caliper about 3-4 times.

10/20/2007 11 :45 Winch Failure at 6480 FT: Changes in the logging speed were noticed by the winchman, after stopping the drum and re-starting it the speed changed again, it slowed down and speed up really fast when winchman tried to adjust. After a couple of minutes winch quit working, operator stopped the joystick and try to re- start the winch without success. SLB crew started trouble shooting the winch checking hydraulic fluid, brakes, chain, winch control panel, etc. Crew contacted REW shop to inform about the failure and request support. Winch started working after 3 to 5 minutes, by that time engineer had already closed the caliper and asked operator to pull out of hole as fast as possible, but logs were not stopped yet. The winch continued working for about 3-4 minutes and then quit again. The joystick was stopped and the whole tiuck was restarted, PTO’s were kicked back in and crew continued trying to move winch from control panel. After about 5 more minutes winch started moving again but this time slower even less than 100 FT/HR. But crew continued moving tool trying to get it into casing. Winch quit again a couple of times and movement was restarted but really slow; the shop mechanics were contacted and winch continued to be trouble shooted with the mechanics on the phone. SLB crew managed to bring the tool up to 6100 FT. After about 10 minutes winch quit again for 17 minutes straight, according with drillers logs. Winchman managed to make drum move but by the time the wiiicli was re-started the cable was keyseated, the tension in the head remained normal but the surface tension was increasing. Engineer pulled up to maximum safe pull =6700 LB without any success and requested authorization from FSM to pull above MSP

FSM authorized to pull up to 7200 LB after, verifying with engineer tlie proper information. Key seat was estimated to be right below casing at 2500 FT according to the MAXIS key seat calculation tool. SLB crew worked the keyseat for about 1 hr. before the client decided to start contacting a fishing company.

10/20/2007 14:OO Client decided to start a fishing operation. SLB crew kept working with to get the keyseat to break without success. Engineer provided the client with a toolsketch that included lengths and OD’s of downhole tools and torpedo inside the head. Toolstring is as follows:

1. LEH-QT 2807 2. DTC-H9064 3. ECHKC 10354 4. HGNSH4789 5. HGNH3886 6. NSRF2562 7. HRcc4774 8. HRMS4779 9. HRGD3932 10. GSRJ 5176 11. AITM 146

10/21/2007 0O:OO Fishing operation started. Fishing company was SMITH. Schlumberger provided fishing sling and 2-way radios for communication. All other equipment was provided by smith iiicludiiig a 3.375 (as stamped on the tool) grapple. Safety meeting was started using the appropriate HARC. Fishing rig-up was performed as per the fisherman suggestions. The rig up in this rig was different as usual since there was no mouse hole; the lower sheave was hanged on the left hand side of the wellhead and the logger was re-spotted aside the catwalk.

10/21/2003 03:OO Fishing rig-up finished and fishing operation started running pipe in the hole. 25 Stands were nm in the hole before the rig crew changed.

10/21/2007 06:OO Safety meeting was held with the day time crew, both crew worked together for a couple of stands to smooth the crew change. Fishing operation continued, when casing shoe was reached the SLB surface tension showed a change about 40 FT below the shoe, but the tool was not free, so the fishing operation continued until 6100 FT.

10/21/2007 13:20 Fish was encountered at around 6045 FT, engagement was confirmed 3 times, changes in tension were observed in the wireline as well as in the drill pipe weight. While moving the drillpipe down when the fish was being approached, the winchman advised about an increase in the wireline tension. 3 joints of pipe were pulled out and the winchman noticed a decrease in the tension up to 500 LB confirming the latch of the fish. The engagement was confirmed 3 times applying tension with the wireline up to 4500 LB and then keeping the wireline static and pulling the drill pipe joints. After the client, the

fisherman, and SLB crew all agreed that the fish was engaged, the rig crew proceed to break the weak point. Weakpoint was broken using the top drive. Weak point broke at around 6,000+ LB, according with the driller’s gauge.

10/21/2007 13:50 Cable started to be spooled back to the dmm. Cable movement was slowed down around 1000 FT and stopped at 100 FT, the remaining of the cable was spooled by hand. At the end of the cable weak point was found as it was intended.

10/21/2007 14:OO Rig crew started pulling out the pipe, rig crew commented the noticed an ovei-pull at around 4500 FT. While SLB was rigging down the sheaves and tie-down chain the drill pipe was moved up and down a couple of times.

10/21/2007 19:30 SLB crew got ready to unload sources but fish did not show up on surface. Another meeting was held with the client, fisherman, rig crew and Schlumberger. The fishing equipment was disassembled and the grapple was verified; only the bottom 3 threads looked as they had engaged the fish downhole. The grapple was tested in a spare head and even though it was inarked as 3.375 it would not fit the 3.375 tools. Another grapple which was available on location and inarked as 3.5 was tested in the tools and it fit proper1 y . The engineer updated the toolsketch given to the company man with the tension and compression limits of the tools and clarified with the fisherman issues related with the location of the sources in the toolstriiig and the hazards related during the Znd attempt of the fishing operation.

Wireline Logging crew: Engineer: Liliana Seres Leader Operator: Doug Robiiison Support while Fishing: Ken Ditges

Operator: EnCana Oil and Gas (USA) Inc.

Well Data: Stud Horse Butte 57-22 NWlSW 1,558‘ FSL, 424’ FWL Section 22, T29N, R 108W Sublette County, Wyoming

Lease No. WYW 127749 API NO. 049-035-25205

Surface Casing Set at 2,501 ft 9 5/8”, 36ppf, J-55, LT&C Depth: 2501’ to 39’ 9 5/8”, 40ppf, N-80, LT&C Depth: 39’ to 0’

Cement back to surface with: Lead 675 sacks 65/35 G/Poz Tail 150 sacks Class G Top out w/ 45 sacks Class G

Cement

Bit Size: 12 %” from 0 ft. to 2501 ft. 8 %” from 2,501 ft. to 10,975 ft 7 7/8“ from 10,975 ft to TD

Formation Tops: Top of the Fort Union: 3,900 ft Base of the Fort Union: 8,020 ft Top of Overpressure: 8,772 ft Lance Upper: 8,860 ft Mesaverde: 12,300 ft Total Depth: 12,457 ft

Schlumberger Logging Tool Estimated depth at 8,757’ (Diagram of tool & dimensions attached)

P&A Procedure Note: All Cement Plugs Class G cement (Weight 15.8 ppg, Yield = 1 .I 5 ft3/sack)

Mud between plugs = 12.6 ppg

Plug # I NRC Required Plug w/ red oxide die. Depth: 8557‘ - 8757‘, 200 ft Openhole log Volume = 11 4 ft3 Excess = 10% 110 sacks class G (15.8 ppg, 1.15ft3/sack)

Tag Cement Plug

Plug #2 Plug at the base of Fort Union 7920’ - 81 20’, 200 ft plug Excess = 10% Openhole log Volume = 91 ft3 90 sacks class G (1 5.8 ppg, 1 .I 5 ft3/sack)

Tag Cement Plug

Plug #3 Stabilizer Plug 5885‘ - 5985’, 100 ft plug

Excess = 54% Assume Hole Volume (bit size) = 8.5" (0.3941 ft3/ft) 55 sacks class G (1 5.8 ppg, 1 .I 5 ft3/sack)

Plus #4 Plug at the top of Fort Union ( EnCana Geologist Est. 3900')

Excess = 54% Assume Hole Volume (bit size) = 8.5" (0.3941 ft3/ft) 55 sacks class G (1 5.8 ppg, 1 .I 5 ft3/sack)

3850' - 3950', 100 ft plug

Plus #5 1/2 In and 1/2 Out of 9-5/8" Surface Casing 2400' - 2600', 200 ft plug Excess = 26% Assume Open Hole Volume = 8.5" (0.3941 ft3/ft) Cased Hole Volume, ID = 8.921" (0.4341 ft3/ft) 90 sacks class G (15.8 ppg, 1 . I 5 ft3/sack)

Tag Cement Plug and confirm placement prior to proceeding to next step. Mechanical Deflection Device (7 7/8" tri-cone bit turned upside down) set at 2400' Dump 10 sacks cement on top of the bit. Circulate 12.6 ppg mud with corrosion Inhibitor in hole.

Plus #7 Surface Plug 0' - 1 OO', 100 ft plug Excess = 10% Cased Hole Volume = 43 ft3 42 sacks class G (15.8 ppg, 1.15ft3/sack)

Cut off 9-5/8", 3 ft below surface. Cap 9-5/8" stub & Install Dry hole Marker plate with well information & NRC radio active source data.

PNA job to cover radioactive source

Tiineline 10/27/2007

Encaiia SHB 57-22 2207 158784

10/26/2007 11:30 pm.. .................. Arrived to the location

10/27/2007 8:OO am ......................Started job, Plug 1 + dye (110 sacks) 8: 12 am... ................. ..Started pumping water (4bbl) 8: 15 am.. .................. .Pressure test lines (5000 psi) 8:20 am.. .................. .Started cement slurry (Plug 1) 8:50 am.. .................. .End lead slurry (22.6 bbl) 8:5 1 am. ................... .Started displacement, watched returns 9: 15 am.. .................. .Ended displacement (1 16 bbl) 9: 15 am. ................... .Washed out 9:20 am.. .................. .Waiting for the cement to set (NLT 8 hrs)

- 7:OO pm.. ................ Encana people tagged it 3 feet earlier with 5000 psi and broke the plug, waiting for the cement to set

10/28/2007 2:OO am .................. Plug 2(90 sacks) 2:30 am.. .................. Safety meeting 2:50 am ................ ..Started pumping water (5 bbl) 2:53 am.. ............... ..Ended pumping water 2:53 am ................. ..Started mixing lead slurry (18 bbl)

3:02 am.. .................. Stated displacement (Includes 2bbl of water behind) 3 :26 am .................. .Ended displacement (1 1 1 bb1+2 bbl) 3:27 am .................. Washed out 3:40 am.. ................ Waiting for the cement to set (NLT 8 hrs)

3:Ol am ................... Ended lead slurry

11:OO am ................. .Encana wanted to wait till 2:OO pm 2:OO pin.. .................. Still waiting 3 :00 pin.. .................. .Encana washed out the plug by circulating and reciprocating

10/29/2007

1:lO pin .................... Safety meeting 1:29 pm.. ............... ..Repeated our 2"d plug job with new parameters (110 sacks) 1:30 pm.. .................. Started pumping water (8 bbl) 1:33 pin.. ............... ..Ended pumping water

1:33 pin ................... Started mixing lead slurry (23 bbl) 1 5 0 pm ................... Ended lead slurry 2: 10 pm.. .................. Started displacement (Includes 2bbl of water behind) 2:26 pm ................... Ended displacement (107 bbl mud +2bbl Hz0) 2:27 pm.. ................ Washed out 2:30 pm.. ................ Waiting for the cement to set (NLT 12 h s )

1013 Of2007

6:30 am.. ................. Plug was tagged @ 7600 ft 1:00 pin.. ............... ..Safety meeting 1:25 pm ................. Started our 3'd plug job 1:26 pm.. ................ Started pumping water ( 5 bbl) 1:27 pm.. ................ Pressure test lines (2500 psi) 1:27 pm.. ............... .Pumped rest of the water (3bbl)

1:34 pm.. .................. .Started cement slurry (Plug 3) 1 : 52 pm. ................... .End lead slurry (1 1 bbl) 1:52 pm.. .................. .Started displacement water 1:53 pm.. .................. .End displacement water (2 bbl)

2: 12 pm.. .................. .Ended displacement (79 bbl) 2: 13 pin.. .................. .Started washing out 2:29 pm.. .................. .Ended washing out 2:30 pm.. ................... Waiting for rig to pool joints = 2000ft (- 1.5-2 hrs)

1:53 pin.. .................. .Started displacement mud

4: 15 pm.. .................. .Safety meeting 4:24 pm.. .................. .Stai-ted our 4 plug job 4:24 pin.. .................. .Stasted pumping water (8 bbl) 4:28 pm.. .................. .Started lead slurry

4:38 pin.. ................... Started displacement water (2 bbl) 4:40 pm.. .................. .End water displacement

4:50 pm.. .................. .Ended mud displacement (49 bbl) 4:50 pin.. ................... Waiting for rig to pool joints = 1OOOft (- 1.5-2 h s )

th

4:37 pin.. ................... Ended lead slurry (-9 bbl)

4:42 pm.. .................. .Started displacement mud

7:30 pin.. .................. .Safety meeting 7:40 pm.. .................. .Started our 5th plug job 7:40 pin.. .................. .Started pumping water (10 bbl) 7:42 pm.. .................. .Started lead slui-ry 8:OO pm.. .................. .Ended lead slurry (-18 bbl) 8:Ol pm.. .................. .Started displacement water (2 bbl) 8:03 pm.. .................. .End water displacement 8:03 pm.. .................. .Started displacement mud 8:26 pm.. .................. .Ended mud displacement (26 bbl)

8:30 pm.. ................. ..Waiting for cement to set (NLT 15 hrs)

1013 112007

-10:30 am.. ................... Cement was tagged Encana put Diverting Plate and Drill Bit into the hole

4:40 pm.. .................. .Safety meeting 4:41 pm.. .................. .Started our 6th plug job 4:41 pm.. .................. .Stai-ted pumping water (2 bbl)

4:44 pm.. .................. .Stai-ted lead slurry 4 5 5 pm.. ................... Ended lead slurry (3 bbl) 4:55 pm.. .................. .Started displacement water (2 bbl) 4:57 pin.. .................. .End water displacement 4: 57 pin. ................... .Started displacement mud 5:05 pin.. .................. .Ended mud displacement (26 bbl) 5: 10 pin.. .................. .Waiting for rig to pull out drill pipe, pull out BOP(b1ow out prevention), cut off well head, put 3 stand pipes back to top out through

4:41 pin.. ................... Ended ahead water

Top out

1O:OO pm. .................... Still waiting

12/02/2007

1:20 am.. .................. ..Safety meeting 1:26 am.. .................... Started top out job 2:27 am.. .................... Ended job (6.5 bbl mixed water used, 55 sacks of cement)

Page 1 of 2

Tom Wood

From: Tom Wood [woodt@sugar-land.oiIfield.slb.com] Sent:

To: ‘clc@nrc.gov’ cc:

Subject: Schlumberger Source Abandonment

Friday, October 26, 2007 1 :02 PM

Erik Borchardt; Jeffrey S Davis

Chuck,

As per our phone conversation, information regarding the abandonment of two radioactive sources for EnCana Oil & Gas in Sublette County, Wyoming is as follows:

Company Name: EnCana Oil and Gas (USA), Inc. Well: Stud Horse Butte 57-22 API Number: 49-035-25205 Location: Jonah Field

TD: 12,745’ Hole Size: 7.875” Casing Size: 9.625” Casing Depth: 2,501’

EnCana has elected to plug and abandon (P&A) this well. The P&A plan is as follows:

A 200‘ cement plug with red oxide dye to be spotted on top of the tool string from -8,757 to -8,557’. A second 200’ cement plug will be set from -8,120’ to -7,920’. A third cement plug will be set from -5,360’ to -5,160’. A fourth cement plug will be set from -2,600’ to -2,400’ An upside down drill bit will be placed on top of the cement plug at -2,400’ and will serve as the mechanical deflection device. A fifth cement plug (surface plug) will be set from -100’ to surface.

Sources and Source D e p a

8,770’ 592 GBq, Am241 Be, Neutron Source, Serial # A2562

8,783’ 63 GBq, Cs 137, Density Source, Serial # A51 76

Source Information

Source #I Identification: 592 GBq, Am241 Be, Neutron Source, Serial # A2562 Manufacturer: Gammatron, Inc. Model: NSR-F (AN-HP)

Source #2 Identification: 63 GBq, Cs 137, Density Source, Serial # A51 76 Manufacturer: AENAmersham Model: CDC.CY3

Written report will be filed with your office as per Part 39,§39.77(d).

10/26/2007

Page 2 of 2

Please don't hesitate to contact me should you have any questions regarding this abandonment,

Best Regards, Tom

T h o m a s S . W o o d Depu ty Radiat ion Safety Of f icer

Sch lumberge r Techno logy Corporat ion 200 Gillingham Lane, MD-7 Sugarland, Texas 77478

Phone: + I (281) 285-7460 Fax: + I (281) 285-8526

Both the individual sending this e-mail and Schlumberger Technology Corporation intend that this electronic message be used exclusively by the individual or entity to which it is intended to be addressed. This message may contain information that is privileged, confidential and thereby exempt and protected from unauthorized disclosure under applicable law. lr the reader of this message is not the intended recipient, or an employee or agent responsible for delivering the message to the intended recipient, be aware that any disclosure. dissemination, distribution or copying of this communication, or the use of its contents, is not authorized and is strictly prohibited. If you have received this communication and are not the intended recipient, please notify the sender immediately and permanently delete the original message and all attachments from your e-mail system

10/26/2007

MEMORY TRANSMI S S I ON REPORT

PAGE : 001 TIME : NOV-12-07 04:53PM TEL NUMBER1 : t281-285-8526 TEL NUMBERZ: t NAME : Schlumberger Technology Corp.

FILE NUMBER

DATE

TO

DOCUMENT PAGES

START TIME

END TIME

SENT PAGES

STATUS

FILE NUMBER : 380

O i l l i ~ l d Sowi=-= Radiarlon/Explosivss Compllance

F a x T O Ernie Jilelc

From Tom Wood

: 380

: NOV-12 04:51PM

: B919857272165

: 003

: NOV-12 04:51PM

: NOV-12 04:53PM

: 003

: OK

*** SUCCESSFULTXNOTICE ***

Schlumberger

Data: November 12,2007

Fax : 986-727-21 65

Tel: 281 -285-7460 Fax: 281 -285-8526

Pages 2 (including cover) Subject Abandonment Plaque - Encanit

Ernie,

R e q u e s t f o r abandonment plaque f o r EnCuna. wel l information follows.

Regards.

L5ie-

This rransmlssion is intended onlyforthe use ofrhe in.lluidual or ent iwro whish iris addressed and may conrain informarlon tha t is privileged and confidential. IP vou =re not the inte,tded resipienr, you aro hereby notified thar any disclosure. disrriburion or Gopyine of rhis informarion is srristly prohihired. If yoil have receivwd rhis rransmission in error. please notify us imrnediar'elv by relephone and return the original documenrsro us a t l l i e address sboue vie The United Stares Pogtel Service=.

Oilfield Services Radiation/Explosives Compliance

200 Gillingham Lane, MD 7 Sugar Land, Texas 77478 Tel 281 485-7460 Fax 281 -285-8526

To Ernie Jilek

From Tom Wood

Subject Abandonment Plaque - EnCana

Date: November 12,2007

Fax : 985-727-21 65

Tel: 281 -285-7460 Fax: 281 -285-8526

Pages 2 (including cover)

Ernie,

Request for abandonment plaque for EnCana, wel l information follows.

Regards,

This transmission is intended only for the use of the individual or entity t o which it is addressed and may contain information that is privileged and confidential. If you are not the intended recipient, you are hereby notified that any disclosure, distribution or copying of this information is strictly prohibited. If you have received this transmission in error, please notify us immediately by telephone and return the original documents to us at the address above via the United States Postal Services.

Oilfield Services

200 Gillingham Lane Sugarlland, Texas 77478 Tel 281-285-8500

Graphics N' Metal 1200 Clause1 Street Mandenville, LA. 70448

(985) 727-21 65 (Fax) (504) 669-6082

November 12,2007

Attn: Ernie Jilek,

Please construct the standard abandonment plaque with the following information:

Company: EnCana Oil & Gas (USA), Inc. Wel l Name: Stud Horse Butte 57-22 Location: 1558' FSL & 424' FWL, Sec. 22, T-29-N, R-108W State: Wyoming

Date of Abandonment: October 27,2007 Wel l Depth: 12,745' M D Plug Back: Surface' Top of Fish: 8,757' Sources Abandoned: 592 GBq (16 Ci), Am-241, Neutron Source @ 8,770'

63 GBq (1.7 Ci), Cs 137, Density Source @ 8,783'

API#: 49-035-25205

Special Instructions: DO NOT RE-ENTER THIS WELL BEFORE CONTACTING REGION IV OFTHE NUCLEAR REGULATORY COMMISSION OR SCHLUMBERGER TECHNOLOGY CORPORATION

Please forward to me the completed plaque and invoice.

Thomas S. Wood

LLOWI U T 592 GBq (I6 63 GBq (1.

- WO 1975 1 FILM POS RRED 100% SCHLUMBERGER

+

Offshore (OCS Waters) rli Land or State Lease Waters Date Time Company Name (Full Name) EnCana Oil and Gas (USA), Inc. Well Name or (OCS-G No. or State Lease No.) Offshore State of Jonah Field Rig Name Ensign 123

Location of Lease County or Parish Sublette State Wyoming District Rock Springs Sales Engr Erik Borchardt TD 12,745’ Mole Size 7 7/8” Deviation 4.7 Casing Depth 2,501 ’ Casing Size 9 5/8” (361bfft) Depth of Fish (Top) 8,757’ (Bottom) 8,801’

Source Activity (1) 592 GBq Source Activity (2) 63 GBq SerialNo. (1) A2562 SerialNo. (2) A5176 Isotope (1) Am-241 -Be Isotope (2) Cs-137 Depth (1) 8,770’ Depth (2) 8,783’ Leak Test Date (1) 5/23/2007 Leak Test Date (2) 8/23/2007 Leak Test Results (1) 1.604-005 yCi Leak Test Results (2) 6.1664E-006 pCi Tool String (Head to Bottom LEH-QT, DTC-H, HILTH-FTB, AIT-N Date and Time Stuck Date and Time Cement Pumped 27-Oct-2007 @08:00 Hole Conditions

Stud Horse Butte 57-22

API Number (If Available or CLSD) 49-035-25205 1558’ FSL & 424’ FWL, Sec. 22, T-29N, R-108W

Source Type (1) NSR-F Source Type (2) GSR-J

20-Oct-2007 @ 12:OO

Hole in bad condition, over pulls of over 20001bs at head of tool (downhole) Experienced all the way from bottom while pooh.

Fishing Attempts See Attached Report

Comments (what happened to get stuck?, etc.,): Winch drum stopped for 17 minutes while pooh, this Caused the cable to become keyseated at 3,500 ft. from surface (estimated keyseat depth from kevseat calculation)

NOTE: Regulatory agencies should be contacted ONLY by the Schlumberger Technology Corporation (STC) Radiation Safety Officer or, if unavailable, his designee.

Notified: .@ NRC or Stateof: NRCRegionW

Name: Mr. Chuck Cain Name: Date: 10/26/2007 Date: Time: 08:20 CST Time:

A The following is a sunnnary of NRC and/or Agreement States regulations that must be followed when abandoning an irretrievable well logging source(s). The specific regulations are found in 10 CFR 39.15 and equivalent regulations in Agreement States. An irretrievable well logging soiirce means any licensed radioactive sealed source that becomes lodged in a well and cannot be retrieved after reasonable efforts have been made to recover the source(s).

If a well logging source is irretrievable, the following requirements must be implemented.

a) The source(s) must be innnobilized and sealed in place with a cement plug. The cement has to be dyed red in Texas as a condition of the Texas Railroad Commission (others occasionally).

A mechanical deflection device must be set at some point in the well above the cement plug to prevent inadvertent intrusion on the source, unless the cement plug and sources(s) are not accessible to any subsequent drilling operations. The mechanical device can be devices such as a whipstock, old drill bit, etc. For LWD, drillpipe andor collars left on top of the BHA usually are approved as a deflection device.

A pelinanent identification plaque, (supplied by your QHSE Manager) made of stainless steel (or brass, bronze and inonel), must be mounted at the surface of the well unless the mounting of tlie plaque is not practical (i.e. subsea completion).

b)

c)

The STC RSO (or his designee) will notify the NRC or Agreement State of the abandonment plan developed by/with the client. The NRC or Agreement State must approve the abandonment plan prior to implementation. The federal and/or state oil and gas well permitting agency noiinally will also require that they approve the abandonment plan. The contact with the well peiinitting agency is the responsibility of the well owner/client but we should advise hiidher of that fact as a courtesy.

If any changes must be made to the abandonment plan submitted to the NRC or Agreement State, tlie STC RSO must be infolined so that he/she can get approval of the modification, as appropriate. The actual abandonment must not begin until any abandonment plan or modification to that plan is approved by the appropriate agency.

The STC Radiation Safety Officer must file a written report with the NRC or Agreement State within 30 days after the abandonment. The facility management should file a written report within 10 days to the STC Radiation Safety Officer via tlie Health, Safety and Environment Manager. The facility report should cover the final abandoninent details such as:

a) Actual date of abandonment.

b)

c)

d)

e)

Any changes in the data sent with the approved abandonment plan.

A new well diagram if different from the that submitted with the approved abandonment plan

Any information pertinent to the abandonment that the STC RSO may not have for his/her final report.

If all data sent to the STC RSO is still applicable for the final report, an e-mail or fax is to be sent to the STC RSO confirming that fact so that he/she can be ensured that the data sent to the appropriate agency is totally accurate. Most facilities send a completely new report since inany these documents often are incomplete or are poor quality fax reproductions.

If there are any questions regarding these procedures, discuss them with your Operations Manager.

FACILITY MANAGEMENT MUST ENSURE THAT THE FINAL ABANDONMENT REPORT IS SUBMITTED TO THE STC RADIATION SAFETY OFFICER.