• Author / Uploaded
• Freddy Mendoza Coronel

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• Tubería de revestimiento (Pozo de sondeo)
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Drilling

COB-114

Drilling

Drilling Phases Summary 26” HOLE SECTION 185 m MDRT to 659 m MDRT 02/ 04 February 2003 The CP N-8 shoe was collapsed, but was recover in September. So it was decided to run a BHA to control with a R.C.J. bit at 185m, after pulled out same, they ran a magnet but no metallic pieces were found. It was decided to run a BHA with a 26” bit to wash down without rotation up to 185m. A new stearable BHA was run with a motor bent at 1.83°. After attempted to pass the shoe from 181m to 185m with a WOB= 2/5t, it was pulled out to run a new BHA to washed down 1000l/mn, 250Psi and tagged the obstruction at 185m. At this stage they decided to run a Taper Mill, hanged up at 177.60m and milled from this depth to 189m. A new stereable BHA was ran to 189m without obstructions; they make a Gyro and drilled to 191.70m. At this depth, as a result of high torque they decided to run a BHA with a magnet, some few pieces of 30” casing were recovered. A new BHA was run with 26” bit rerun for finally pass over casing and drill out to 210m. A new BHA with a motor/sleeve 25”3/4 was ran, and drilled formation in sliding mode taking gyro survey every 10m up to 315m, taking 3.70° inc and an azimuth of 141.28°, they spaced out gyro survey 29m apart then 85m, sliding and rotating to the Total Depth of this phase at 659m.

17½” HOLE SECTION 659m MDRT to 2160m MDRT 15 February to 28 February 2002 The directional 17”1/2 BHA with a PDC bit was made up and ran in hole to the top of cement at 615m. The cement was drilled out to the casing shoe at 649m, the pocket washed and 1 meter of new formation drilled prior the L.O.T. The maximum pressure reached was 360 Psi for an Equivalent Mud Weight of 1.42 SG. Then the hole was drilled to 1501m without any problem as per directional drillers instructions. A bottom up circulation was performed prior a wiper trip to the shoe. While running in hole only the last stand was circulated to clean the bottom. The bit continued up to 2008 m where the rate of penetration was null. The bit was pulled out in back reaming mode from 2008m to 1947m then “wet” to the surface. The bit was in very bad shape.

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COB-114

Drilling

A new BHA with a rock bit was picked up and made up then ran in hole to 1942m where they must wash down to bottom. This bit reached TD at 2160m as per directional driller instructions. A wiper trip to 1881m and a “hole clean” circulation on the bottom were performed prior to pull out the string to run the 13”3/8 casing. The 13”3/8 casing shoe was set and cemented at 2153m without difficulties. The new BOP’s were nipple up and tested before to pick up the 12”1/4 BHA.

12¼” HOLE SECTION 2160 m MDRT to 3190 m MDRT 01 March 2003 to 15 March 2003 After resolving the problem of inability of the wear bushing passing through the BOP stack, the 12¼” BHA was made up and run in hole to drill out the cement and float collar from 2116 m to the shoe at 2153m. The pocket, from 2153 to 2160m, was washed and 5 meter of new formation drilled prior the F.I.T. The maximum pressure reached was 1938 Psi to give an Equivalent Mud Weight equal to 1.93 SG. Then the hole was drilled with a PDC BIT to 2614m without any problem as per directional drillers instructions. A bottom up circulation was performed prior a wiper trip to the shoe. While running in hole only the last stand was circulated to clean the bottom. The bit continued up to 2776 m. The directional driller build up the angle up to 33°13. At this depth because of a slow rate of penetration, the bit was pulled out in back reaming mode from 2776m to 2584m then “wet” to the surface. A new BHA with a new motor setting (1.22) was picked up and made up then ran in hole to 2776m. This bit reached 3105m as per directional driller instructions, building up angle to 44°37. At this step, because of new provisional formation harder and a slow rate of penetration, they pulled out this bit. A new BHA with a rock bit and a new motor setting (0°00) was picked up then ran in hole to 3105m where the hole was washed down to the bottom. This bit reached TD of this phase at 3190m as per directional driller instructions to reach a drift of 42°03. The 9”5/8 casing was run and land at 3186m where it was cemented.

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COB-114

Drilling

8½” HOLE SECTION 2190 m MDRT to 4117 m MDRT 22 March 2003 to 02 April 2003 A 8 ½” BHA was run to tag the cement at 3096m and to drill it out to the shoe at 3186m. The drilling progressed from 3190m to 350m as per the Directional Drillers instructions. Losses were recorded at 3240m, up to 7m3/hr were recorded; a 20m3 LCM pill was spotted in response, the losses were stabilized at 2m3/h then the drilling was resumed to 3454m. The bit was pulling out due to an over time rotation. A new PDC bit 8½” with a new motor set bent (1.15°) was run in hole, losses were 2.5 m/hr and increased to 8 m3/hr at shoe 3190m. At 3364m, 7m3 of LCM were spotted in response and the bit pulled back in the casing shoe. Many LCM pills were set to cure the losses, but it was impossible to stop them, so it was decided to drill ahead as soon as they were reduced to 2 m3/h.

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COB-114

Drilling

8”½ HOLE SECTION 4730 m MDRT to 4941 m MDRT 04 January 2003 to 19 january 2003 The BHA #17 was run with a PDC bit to drill out the cement and to continue in the formation. Once on bottom it was very difficult to rotate with the top drive which one was stopped many times due to very high torque (> 4000 m*kg). So it was decided to pull out this BHA to include a motor to be able to slide if it was not possible to rotate even the BHA out of the casing. With the same bit in the BHA #18 it was possible to drill in sliding mode the cement, the shoe at 4720m and the formation to 4868m. But the torque was still too high to rotate so the directional driller cannot keep the angle and this BHA was pull out to remove the stabilizers. The new BHA #19 was made up with an insert bit and no stabilizer, once on bottom it was possible to rotate with a normal torque around 2000 m*kg. In normal conditions, drilling continued to 4936m where mud losses were detected. Making a flow check, the losses were established to 6m3/h in static, it was decided to continue drilling but at 4941m the losses reached 12m3/h while circulating and the decision to plug them was taken. It was impossible to maintain a stable static level but, after spot 5 LCM pills, losses at 600/ 800l/h were considered as acceptable prior to run the E-logs. Five E-logs runs were planned: the first (APS-HNGS-MDT) was made in TLC mode ; the second was the VSI, made inside the 5”DP ; the third one was the AIT-FMI-DSI-E ; the fourth was the FMI-GR-DSI-AITC ; the fifth was the FMI-GR-DSI-EMS. The new BHA #20 was decided to continue drilling to 4991mTD lossing 4m3/hr. Running liner 7” to 4575m losing 6m3/hr. Running Completion string tubing 4.5” to 4608m monitoring on trip tank losses 6.3m3/hr. Completion job.

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COB-114

Drilling

Drilling Activities Summary 04 Feb. 2003

Install bell nipple - M/up BHA - Slip 11m of drilling line - RIH to 185m - Tag bottom, Drop ball - Take above 0.5m core – POOH - M/up magnet w/ same string and RIH to 180m circ 5mn w/1000 l/mn - Tag bottom twice - POOH magnet - M/up BHA 26” same string RIH to 180m – Cont. wash down to 185m, @ 181m - Pull out to surface - L/down jar + bit sub and P/up new BHA w/ motor, RIH.

05 Feb 2003

Cont. M/up BHA, RIH to 180m - Attempt to pass shoe @181-185m - Hang up 184.39m POOH and M/up new BHA - RIH same to 174m - Wash down and Tag obscuration @ 185m - P/up and attempt to work string - POOH 26” Bit f/ 185m to 30m – B/out and L/down orienting sub f/ valve-motor - P/up taper mill assy and RIH same to 160m.

06 Feb 2003

Wash down f/ 155m & Take parameters - Hang up 177.6m & Mill to 178m - Electrical repair on TDS due to vibration – Cont. milling to 178.90m - Repair electrical cable on TDS due to vibration - Milling f/ 178.9m to 179.95m - Maintenance TDS - Milling f/ 179.75m to 180.8m - P/up 1 5”HWDP - Repair bolts broken on pipe Mandrel due to vibrations - Milling f/ 180.8m to 180.90m.

07 Feb 2003

Cont. milling f/ 180.6m to 182.5m - Stop milling due to TDS repairing - Resume milling to 186.80m - Maintenance TDS and add single 5”HWDP - Milling f/ 186.8m to 189m POOH Taper mill f/ 189m to 77m – P/up 1 5”HWDP and 1 X-over above 8”¼DC and hydro jar - Control 2 stabilizers and Taper mill - L/down Taper mill and RIH bit sub to 27m - Maintenance TDS – B/out bit sub + pony + 1stab + 26” Bit.

08 Feb 2003

Cont. L/out milling BHA - Clean and clear rig floor – M/up 26” drilling Assy & RIH to 132m - RIH 2 stds HWDP & L/out same from single drilling - RIH to 188m: no obstruction - Break circ. - PJSM prior to rig up Schlumberger wire-line equipment - Gyro data & take survey – R/down Schlumberger - Take parameters and Slide f/ 188m to 191.7m - L/down 1 HWDP - POOH 26” bit to surface and L/down same – P/up 1 X-over and 2 5”HWDP – B/out orienting sub - RIH magnet and tag bottom w/ 5 tons - POOH magnet and L/down same – P/up 26” Bit + Bit sub + Stab - RIH to 35m.

09 Feb 2003

M/up BHA & RIH - Rotate f/ 191.7m to 210m & back-ream 2 std twice - PJSM - POOH & L/out BHA to 10m - L/down 26” std - M/up 2 9”½ DC - L/down bit & bit sub - P/up motor + float sub + orienting sub + sleeve + 26” bit - Adjust Ben Housing 1.15° and orienting sleeve - RIH 26” bit f/ 130 to 210m - Tag bottom w/ 5 tons – R/up equipment for Gyro Sliding f / 210m to 225m and run Gyro survey every single drilled.

10 Feb 2003

Slide f/ 225m to 280m taking Gyro survey every single drilled - Rotate f/ 280m to 299m - Resume sliding f/ 299m to 315m & Drill f/ 315m to 329m - Take Gyro survey – Cont. rotating f/ 329m to 358m, Take Gyro - Slide and rotate f/ 358m to 471m taking Gyro surveys.

11 Feb 2003

Slide and rotate f/ 471m to 650m section TD, taking Gyro surveys every 3 stds drilled Circulate 12000 Strks - POOH 26” Bit f/ 659m to 175m (659 to 605m: 5-10t over-pull; 605 to 491m: 10-20t over-pull) - Pump out f/ 491m to 175m; 285m: 20t over-pull -RIH f/ 175 to 659m: OK – Circ. w/ mud 1.14 to hole clean - Displace hole w/ 1.20 SG bentonitic mud.

12 Feb. 2003

POOH 26” Bit f/ 659m to surface and B/out same - Nipple down Bell Nipple & Riser and L/out on Tender – P/up Weatherford Csg equipment & R/up same - P/up 20” Csg shoe and RIH to 649m filling up Csg string every 3 Jnts.

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COB-114

Drilling

13 Feb. 2003

PJSM & L/out Weatherford Csg tong - Power pack and clear rig floor – R/up 5” elevators & plate - PJSM prior to run stinger - RIH with Stinger, Tag float collar, Space out - Install cement head – R/up cement line, Flush through with seawater - Install low Torque and Elbow to cement head, Test line 2000Psi - Circulate SW w/ rig pumps via cmt line-good returns - Start cement job: Pump 20m3 of spacer with rig pumps; perform cement operation as per TFE procedure, cmt returns confirmed & displaced – B/out and L/out circulating head - POOH 3 stds of 5” DP; circulate @ 105spm = 2000l/min. OK; POOH 19 stds 5” - L/out jnt #48 + PJ + Csg head - Rig skidding - PJSM prior to move Tender - R/down Schlumberger - P/up wire-line cabin – L/down 20” Csg material - R/up material wire-line in progress.

14 Feb. 2003

Press test line to 3000Psi: OK, Press test riser + Flow head: 3000Psi - R/up lubricator + pop, Install on flow head, Press test to 3000Psi: OK - R/down, open Swab, RIH, Retrieve SCSSV, Pulling tool - L/out SCSSV + valve GRX 3", RIH, Retrieve junk catcher to surface - R/up and RIH w/ 3"1/2 slick plug, Equalize PRONG and PLOG, POOH to surface - M/up 3"6.5 pulling Prong, RIH, Latch on, Pull 212 slick plug wait 15 mins - Pull to surface, L/out plug, R/up SCSSV, RIH, Set at 151m - R/down surface equipment on long string - Install short string (Cob_107) - Press test riser to 3000Psi and flow head, Install lubricator and pulling tool, Press test to 3000 Psi: OK - RIH and Recover SCSSV, Pull to surface, L/down same - RIH and Recover Junk Catcher, Pull to surface, L/down same, M/up Prong equalizing, pull plug - Set safety valve - Empty riser and clear rig floor - L/down riser - Prepared skidding – Skidding - P/up riser 4"1/4, Install flow head Test riser to 3000 Psi, Install and test SAS to 3000Psi – Wire-line, Set injection valve, Pull basket, Equalized Prong - Set safety valve - R/down Wire-line equipment

15 Feb. 2003

Clear rig floor of Schlumberger equipment, L/out flow head and riser - PJSM, Prepare rig for skidding - Skid rig f/ COB105 to max south prior to move equipment , Move tender platform - Remove slick line K-winch w/ tender crane, Move Schlumberger electric cable f/ tender to platform, Make rig safe after operation - Skid rig to COB114, Secure rig - PJSM, P/up riser, Nipple up riser + BOP's + C&K lines, Bell nipple complete - R/up and test csg - Attempt press test (leak at kill line connection), Investigate leak, Repair same, Test cmt line= 2000Psi, Test 20" csg and Blind rams = 500/1500Psi - Test assy w/ tester cup 20" - Test annular on Cup 20"= 500Psi/5min, 1000Psi/15min - Test 5" Rams and valve C&K lines= 500Psi/5min, 1500Psi/15min - Pull out 3 stds DP5" and tester cup - Test I-BOP and lower I-BOP= 500Psi/5min, 1500Psi/15min - Install wear bushing - Change saver sub on pipe handler - Change sleeve on motor, M/up bit 17"1/2 - P/up mouse hole, L/down 2 x 9"1/2 DC - Pick up power pulse + MNDC + Stab

16 Feb. 2003

Cont. M/up 17 ½” BHA - M/up orienting sub & data orientate UBHO - M/up 8”DC & 9½”DC - Stop M/up BHA & L/out jar + 3 x 6½”DC + 8”DC on tender - P/up from tender & RIH jar and 2 x 8¼” DC – Cont. RIH with 5” HWDP & DP to 600m and take parameters Wash down & tag cement @ 615m,drill out same & clean out pocket to 659m - Drill 1m of new formation to 660m & back ream stand, Wash back down to 657m & displace hole with 1.22 SG OBM - Circulate to homogenize mud - Fill cmt line & test to 2200Psi Perform LOT - Drilling from 660m to 678m - Install Schlumberger for Gyro and perform Gyro survey - Resume drilling f / 678m to 800m.

17 Feb. 2003

Drilling f/ 800m to 925m - Lost of power on top drive - Pull back to 910m - Circulate while Electrician investigation and repair same - Work sting ensure free - Continue drilling as per directional drillers instructions f / 925m to 1108m.

18 Feb. 2003

Drilling as per directional driller instructions f / 1108m to 1501m

19 Feb. 2003

Circulate hole clean (Q= 3100l/mn, SPP= 3200Psi) - Flow check and POOH f/ 1501m to 625m for wiper trip. - Make well safe, Monitor well on trip tank, Contruction radioactive source operation - Slip 10m drill line, Test and Reset Crown o Matic - RIH f/ 625 to 1473m - Wash down f/ 1473m to TD, Take parameter and SCR, Tag at 1501m Rotating f/ 1501m to 1528m - Sliding f/ 1528m to 1539m - Rotate drill f/ 1539 to 1669m Sliding f/ 1669 to 1679m - Rotate f/ 1679 to 1753m. 6-7

COB-114

Drilling

20 Feb. 2003

Cont. to rotate drill f/ 1753m to 1865m - Slide f/ 1865m to 1875m - Rotate drill f/ 1875m to 1892m - Slide f/ 1892m to 1897m - Rotate drill f/ 1897m to 1921m - Slide f/ 1921m to 1926m - Rotate drill f/ 1926m to 1949m - Slide f/ 1949m to 1956m - Rotate drill f/ 1956m to 1967m (f/ 1965m to 1967m: difficulties to drill: stack motor and hight torque)

21 Feb. 2003

Cont. rotating f/ 1967m to 1977m - Slide f/ 1977m to 1982m - Rotate drill f/ 1982m to 2004m - Slide f/ 2004m to 2005m – Bell Nipple leaking, Pull 1 std to 1978m and work string, repair Bell nipple leak and test prior to drill - Cont to Slide f/ 2005m to 2008m Work string w/ 1600l/mn - Back reaming f/ 2008m to 1947m - POOH f/ 1947m to 1325m, Pump slug (4m3), POOH f/ 1325m to 623m - Flow check, POOH f/ 623m to top of BHA - Flow check, POOH BHA and PDC bit 17” ½ - L/out bit + motor - PJSM, Repair Bell nipple leak.

22 Feb. 2003

M/up 17”1/2 motor + Float sub + Stab + Shot NMDC - Scribe motor (1.22 Bend), Install and M/up Sleeve 17”1/2 - M/up bit + MWD power pulse, Test same - M/up O/sub 8”1/4 DC + jar + HWDP, RIH 5” DP to shoe @= 659m - Cont. RIH in open hole f/ 659m to 1942m - Wash and ream f/ 1942m to 2005m - Take MWD survey, Wash down, Tag bottom at 2008m - Break in new bit, Rotate f/ 2008m to 2013m - Slide f/ 2013m to 2018m - Rotate f/ 2018m to 2033m - Slide f/ 2033m to 2039m - Rotate f/ 2039m to 2060m - Slide f/ 2060m to 2069m - Rotate f/ 2069m to 2089m - Slide f/ 2089m to 2100m - Replace pipe handler locked sensor on top drive, Investigate on break problem Rotate f/ 2100m to 2116m - Slide f/ 2116m to 2122m.

23 Feb. 2003

Slide f/ 2122m to 2128m - Rotate f/ 2128m to 2160m - Work string and circ. B/up, Flow check - POOH f/ 2160m to 1881m, Back ream f/ 1977m to 1949m - RIH back to Btm, Circ. hole clean - Flow check, POOH f/ 2160m to 1859m - Pump slug (4m3), POOH f/ 1859m to 650m - Flow check, POOH f/ 650m to 250m (Top of BHA) - Flow check, POOH BHA - L/down 1x9"1/2DC + Orienting sub + 1xNMDC 9"1/2 + Power pulse L/down BHA + Bit.

24 Feb. 2003

Cont. L/out 17"1/2 BHA to tender - Clean and Clear rig floor for safety - Attempt to pull wear bushing, No success, R/back running tool, RIH to well head, Flush, Work string 15/ 18 mns, POOH, Run back w/ running tool, Enlarge on Wear bushing, Retrieve B/out running tool, L/out same - Change out bails to 500 tons bails, M/up Lafleur + XO to TDS, Install 500 tons elevators P/up, Spot Weatherford power pack, R/up mounted slips and power tong - PJSM, P/up shoe joint, Check function, M/up float collar, Break circ. - P/up and RIH 13"3/8 csg string, Fill each joint to 332m - Change Weatherfoerd valve (clean rig floor) - P/up and RIH 13"3/8 csg f/ 332m to 648m - Circ. 55 m3 mud (Q= 1600l/mn, SPP= 300Psi) - P/up and RIH 13"3/8 csg f/ 648m to 1000m - Circ. 10 m3 mud (Q= 1600l/mn, SPP= 400Psi) - P/up and RIH 13"3/8 csg f/ 1000m to 1071m

25 Feb. 2003

Cont. RIH w/ 13"3/8 csg to 1500m - Break circ. 20m3 : Q= 1500l/mn, SPP= 200Psi Cont. RIH f/ 1500m to 2153m filling every joint, RIH w/ circ. f/ 2130m to 2153m - L/down Weatherford head - Install Cmt head, Test line to 5000Psi, PJSM - Cic. 180m3, Started pumping slowly - Pump 30m3 Pre-spacer @ 1600 l/mn - Cement job, Pump 64.6m3 of Gel cmt (d= 1.5 sg), Pump 21.5m3 of Gel cmt (d= 1.90 sg) - Displacement w/ rig pump (10350 strokes), Final pressure = 950Psi - W.O.C. Check return on Trip tank

26 Feb. 2003

Wait on cement - Empty riser - Cut casing - Nipple down BOP’s.

27 Feb. 2003

Nipple up and Test BOP's

28 Feb. 2003

Test BOB - M/up new BHA.

01 Mar. 2003

P/up 3 x 8”DC - Run to 61m - Test motor - RIH BHA and DP to 2000m - Slip and cut drilling cable - RIH to 2115m, tag float collar, drill out cement to 2160m (shoe at 2153m) - Drill formation f/ 2160m to 2165m, Circ. B/up, Test line and Perform a FIT: EMW= 1.93 - Drill formation: Rotating= 2165/ 2167m, 2172/ 2194m, 2204/ 2214m; Sliding= 2167/ 2172m, 2194/ 2204m. 6-8

COB-114

Drilling

02 Mar. 2003

Drilling as per directional driller instructions: Rotating= 2214/ 2222m, 2236/ 2250m, 2262/ 2278m, 2288/ 2306m, 2316/ 2418m; Sliding= 2222/ 2236m, 2250/ 2262m, 2278/ 2288m, 2306/ 2316m, 2418/ 2419m

03 Mar 2003

Drilling as per directional driller instructions: Sliding= 2419/ 2435m, 2446/ 2455 m, 2475/ 2490m, 2512/ 2531m, 2540/ 2549m; Rotating= 2435/ 2446m, 2455/ 2475m, 2490/ 2512m, 2531/ 2540m

04 Mar 2003

Drilling as per directional driller instructions: Sliding= 2549/ 2558m, 2568/ 2614m – Rotating= 2558m/ 2568m - Circulation Bottom up at 2900l/mn - Wiper trip to shoe Maintenance TDS - RIH to bottom (2614m) – Resumed drilling as per directional driller instructions: Rotating= 2614/ 2623m; Sliding= 2623/ 2629m.

05 Mar 2003

Drilling as per directional driller instructions: Sliding= 2629/ 2641m, 2651/ 2669m, 2681/ 2697m, 2710/ 2725m; Rotating= 2641/ 2651m, 2669/ 2681m, 2697/ 2707m, 2707/ 2710m, 2725/ 2729m.

06 Mar 2003

Drilling as per directional driller instructions: Rotating= 2726/ 2740m, 2754/ 2766m, 2772/ 2774m; Sliding= 2740/ 2754m, 2766/ 2772m, 2774/ 2775m - Circulation bottom up – POOH to Csg shoe - Flow check and Pump slug (3 x 2m3) – Cont. POOH.

07 Mar 2003

POOH BHA to surface, L/down bit - P/up new bit + new motor - RIH BHA w/DP to 2121m - Slip 11m of drilling line - RIH BHA to bottom - Drilling as per directional driller instructions: Sliding= 2776/ 2782m, 2798/ 2809m; Rotating= 2782/ 2798m, 2809/ 2816m.

08 Mar 2003

Drilling as per directional driller instructions: Rotating= 2816/ 2830m, 2838/ 2924m, 2929/ 2947m; Sliding= 2830/ 2838m, 2924/ 2929m

09 Mar 2003

Drilling as per directional driller instructions: Rotating= 2947/ 3040m, 3042/ 3043m; Sliding= 3040/ 3042m

10 Mar 2003

Drilling as per directional driller instructions: Rotating= 3043/ 3050m, 3054/ 3098m – Sliding= 3050/ 3054m

11 Mar 2003

Drilling from 3098m to 3105m - Pump 3m3 low vis, 5m3 heavy pill and Circ. same, Flow check - POOH to 2300m, Pump slug, POOH to shoe, Flow check - Maintenance TDS POOH, Flow check, L/down single, Cont. POOH to surface - L/down bit#10 with bit#11 RIH BHA, M/up Monel + Power pulse + bent sub (0 deg), Beak circulation, check MWD - RIH with DC and HWDP filling up every 20 stds, Break circulation at top of BHA and RIH to shoe w/DP - Slip drilling cable - RIH in open hole.

12 Mar 2003

RIH to 3012m - Reaming f/ 3012 to 3105m - Drilling f/ 3105m to 3127m.

13 Mar 2003

Drilling f/ 3127m to 3140m

14 Mar 2003

Drilling f/ 3152m to 3164m, Circ. 2500 l/min, 4100 Psi, Gas increase to 20.37%, Flow check: OK - Drilling f/ 3165m to 3177m.

15 Mar 2003

Drilling f/ 3177m to 3188m, Repaired on pump #2 and#3 - Drilling f/3188m to 3188m. Drilling f/ 3188m to 3190m (TD) - Circulated 2400 l/mn -Circulated 3m3 low vis pill , follow up 5m3 heavy pill, Flow check - Wiper trip to 2153m - Circulate B/up, Max gas = 3.14%.

16 Mar 2003

Circulate out 3m3 low-vis pill, follow up with 5m3 heavy pill – Flow check OK, POOH to 2600m, Pump slug 6m3 - POOH from 2600m to 2131m, Flow check= OK - POOH from 2131 to 286m top of BHA - Flow check= OK - POOH BHA wet - L/down NMDC + Power pulse + bit 12 ¼” + 2 x 8” SNMDC - POOH BHA & L/down Monel + stabilizer + motor 6-9

COB-114

Drilling

Clean floor/ housekeeping - SPJD prior R/up equipment and logs - R/up Schlumberger equipment - Run tools to 3190m, logs DSL f/ 3190 to 2700m - A &TC GR f/ 3190m to 2153m - POOH tools – R/down tools. 17 Mar 2003

Run 9”5/8 csg f/ 588m to 1200m – Fill up each joint - @1200m, Circulated 45m3 OBM – Cont. to run 9”5./8 csg f/ 1200 to 2180m.

18 Mar 2003

Run 9”5/8 csg f/ 2120m to 2146m - Circulate at 1800l/m - Run 9”5/8 csg f/ 2146m to 2800m - Circulate B/up at 1500 l/mn , Max gas= 10% - Run 9”5/8 csg f/ 2800m to 3186m - Release long bail elevator, B/down fill up tool “Lafleur” - M/up cement head, connect 2” lines x 2, P/up to m/d weight - Circulated 160m3 OBM to condition mud (1.5 bottoms up) 1500 l/mn, Max gas= 6% - PJSM w/ crew and all supervisors prior to cement job - Rig pump 30m3 of pre-flush (1.58sg), Followed up by 10m3 Dowell water base spacer, 1.65 SG - Test cement line @ 5000Psi - Drop bottom plug - Dowell pump 33.3m3 of cement (1.90sg), Drop top plug, Dowell displace w/ 1.59m3 of fresh water Rig pumps displace w/ sea water - 2650 Psi end pressure, no bump - Bleed off casing pressure, Volume return 1400l - WOC: control annulus w/ 200 Psi, monitor casing on trip tank. .

19 Mar 2003

WOC - S.P.J.M.- Bleed off annulus pressure, open annulus, flush riser and BOP stack w/ sea water, Bleed off platform - Disconnect riser f/ spool, P/up 13”3/8 BOP + riser and secure same - Remove bottom guides under spider elevator, release cement head over 9”5/8 csg - Pull 9”5/8 csg and set on slips w/ 80t above cement - Attempt to release slips of spider elevator, Stuck on csg joint, investigation in progress - Continue to attempt to release spider slips from 9”5/8 csg= no success - Change out bails and install slings on elevators - Install csg cutting tool on 9”5/8 csg - Cut 9”5/8 csg 16cm above 13”5/8 flange w/ 9T over-pull - P/up and confirm cut (OK) and R/down cutting equipment to rig floor – R/up cutting equipment and cut 9”5/8 csg under elevators – L/out slips w/ cut csg to tender - PSSM and risk assessment – L/out remaining landing string and clear rig floor – B/ out bottom riser adaptor and L/out same – R/up csg spool and prepare well head, install same.

20 Mar 2003

Nipple up 11”csg spool + csg head 9”5/8, Tight belt, Pressure test= 5000 Psi - N/up BOP stack and riser on casing head - Tightening flange and clamps, Install 2 wing valves on csg head - Remove check valves on emergency kill line and kill line – B/down BOP tool - M/up test assy w/ tester cap 9”5/8 - SPJM prior to pressure testing BOP Pressure test BOP: Test I: well head, rams, 5h upper inlet valves kill and choke, 300 Psi and 5000Psi; Test II = annulus 300Psi and 3000Psi - B/down assy tester cap, M/up assy tester plug - Pressure test 5” p/rams, 2 7/8 x 5” variables, choke line and kill line, BOP valves, mud hose, 300Psi and 5000Psi - B/out assy - Leave test plug and test shear rams via choke line, 1000Psi, 2000Psi, 3000Psi - Pull tester plug assy and L/out same M/up wear bushing R/tool - RIH and set wear bushing - Pull R/tool, B/out and L/out same - Clean rig floor - PJSM - RIH w/ 5 x 8”1/4DC + 1 x 8” jar + 3 x 6”1/2DC - B/out, clean and protect threads, L/out on tender.

21 Mar 2003

Test Manifold and pipe manifold at 5030 Psi – M/up 8”1/2 BHA - Test Motor/ MWD and P/up 5”HWDP - RIH BHA to 840m – Working on TDS – Cont. RIH 2705m.

22 Mar 2003

RIH f/ 2705m to 3096m - Tag cmt at 3096m, Wash down, Confirm depth w/ 3t WOB POOH 1 stand, Rack same, slip 15m of drill line- RIH to 3096m and drill out cement to 3182m, Pump 5m3 hi-vis pill each 10m, Start to displace sea water w/ mud f/ 3176m to 3182m and Circulate until mud return to surface - Drill out shoe @ 3183m, Clean pocket to 3190m, Flow check= OK – SPR record @ 3190m -Circulate through choke manifold to check lines, Flow check= OK - Circulate B/up, Max gas= 8.8% - Drill 8”1/2 hole, sliding f/ 3190m to 3250m - Experience losses @ 3240m= 7m3/hour - Pump 20m3 LCM and Circulate – Sliding= 3192/ 3197m, 3202/ 3207m, 3212/ 3217m, 3222/ 3227m, 3232/ 3237m, 3242/ 3248m, Rotating= 3197/ 3202m, 3207/ 3212m, 3217/ 3222m, 3227/ 3232m, 3237/ 3242m, 3248/ 3250m. 6-10

COB-114

Drilling

23 Mar 2003

Drill f/ 3250 to 3271m, losses 8m3/hr – Gain 2m3, Flow check, Circ. B/up - Spot 7m3 LCM, Flow check no losses, POOH to shoe - Circulate, well stable - RIH to bottom - Drill f/ 3271 to 3309m - Circulate Maxi gas= 15%, losses= 2m3/hr - Drill f/ 3309 to 3418m, Max gas= 10%, Losses= 2m3/hr – Sliding= 3346/ 3351m, 3361/ 3366m, 3375/ 3380m, 3391/ 3396m, 3405/ 3411m; Rotating= 3338/ 3346m, 3351/ 3361m, 3366/ 3375m, 3380/ 3391m, 3396/ 3405m, 3411/ 3418m.

24 Mar 2003

Drill f/ 3418 to 3454m, losses 2m3/hr - POOH to 9”5/8 shoe - Circulate B/up at shoe – Flow check 15’, losses 2.5m3/hr - POOH bit to surface pipes wet - POOH f/ 2342 to 290m - Flow check on trip tank, losses= 2.5m3/hr - POOH BHA to surface, L/down motor + ARC + bit - Clean & clear rig floor for safety - PJSM & P/up new 8”½ BHA, Set motor @1.15° & RIH - Shallow test motor & MWD – Cont. RIH w/ 5”DP & HWDP.

25 Mar 2003

Continue RIH w/ 5”HWDP to 942m, top BHA, changed jar and landing sub positions in BHA - RIH w/ 5”DP f/ 942m to 9”5/8 shoe @ 3185m, Fill up string each 600m - L/down single, P/up 1 pop joint - Slip 9m drill line and cut excess - Circulate w/ TF on high side, 8m3/hr losses - RIH to 3366m, 8m3/hr losses - Spot 7m3 LCM, Displace at 800l/mn max - POOH bit above 9”5/8 shoe at 3193m - Orientate TF on high side, install safety valve & injection hose on top of string - Repair I-BOP valve on TDS, circulate at 800l/mn, 2.5m3/hr losses - Function test I-BOP: OK - RIH to 3425m - Break circulation, wash, ream & work through full hole - Take SCRs - Drill 8”1./2 f/ 3475m to 3480m as per directional driller instructions: Rotating: 3454/ 3470m, 3472/ 3478m, Sliding: 3470/ 3472m, 3478/ 3480m.

26 Mar 2003

Drilling f/ 3480m to 3519m as per directional driller instructions: Rotating: 3480/ 3483m, 3500/ 3503m - Mud losses: f/ 2.5m3 to 3.2m3/h - Rotate drilling f/ 3519m to 3524m Pump 13m3 LCM and displace - Flow check losses 7m3/h - POOH f/ 3524m to 3188m. Flow check losses 4m3/h - POOH f/ 3188m to 2435m - Flow check on trip tank 8m3/h RIH f/ 2435m to 3163m - Monitor well and Repair Bell nipple leak - Fill well – Cont. RIH f/ 3163m to 3367m.

27 Mar 2003

Spot 7m3 LCM @ 3366m, displacement 1500l/mn and 800l/mn, Flow check: Losses = 6m3/hr - POOH to 9”5/8 csg shoe - Flow check: Losses= 6m3/hr - Mix LCM - RIH to 3366m - Spot 7m3 LCM pill - POOH to shoe - Flow check: Losses= 5m3/hr - POOH from shoe to top HWDP – Flow check: Losses= 5.7m3/hr while tripping - Circulate to clean and check MWD – Flow check: Losses= 4.5m3/hr - POOH 21 stands HWDP + jar - Rack BHA + Power pulse + NMDC, B/out bit + stabilizer – L/out same - M/up new BHA, M/up bit + motor & Adjust stabilizer - Test motor + function test Andergauge, Set in 7”¾ position - P/up ARC w/ new memory, RIH, Scribe memory – Cont. RIH w/ MWD & NMDC - Test MWD – Cont. RIH at controlled speed w/ HWDP, jar and 5”DP - Fill string every 600m to 3164m - Flow check: Losses= 6.5m/hr - Slip 13m drilling line - Losses while RIH = 18-19m3/hr.

28 Mar 2003

RHI f/ shoe 9”5/8 to 3366,m - Fill up string - Spot 8m3 of LCM pill - Flow 1500 l/min to 800 l/min - POOH to shoe 9”5/8. - Orientate GTF on hight side, Circulate B/up: mud losses 3m3/hr - RIH to bottom, Ream 2 last stands to bottom @=3524m - Drilling f/ 3524m to 3652m, Losses = 2.5m3/hr.

29 Mar 2003

Drilling (rotary and sliding) f/ 3652m to 3785m.

30 Mar 2003

Drilling (rotary and sliding) f/ 3785m to 3833m – Circ. B/up at 1800 l/mn - Flow check: Losses= 2m3/hr - POOH bit f/ 3833m to 3169m - Flow check: Losses= 2m3/hr Continue POOH to top of BHA - Flow check: Losses= 2.5m3/hr - POOH 5”HWDP and 5”DP – L/down MWD + Motor + Stab + Bit - Clean rig floor for safety - Prepare to P/up new BHA – P/up MWD tool repaired, confirm communication to Unit - RIH MWD – P/up ADN with 8”¼ Stab. and M/up to string confirm communication to HMIT - Clear rig floor P/up and install Radio Active source in AND tool, RIH.

6-11

COB-114

Drilling

31 Mar 2003

Run BHA with 2 stands 5”DP to 100m, Circulate - Test MWD - Run 30 stands of 5”DP to 942m, F/up string - Run with 5”HWDP to 1106m – R/up and M/up Hydro jar -RIH with 5” HWDP to 1190m and with 5”DP to csg shoe, F/up string every 600m - Slip 10m of drilling line, Adjust and check Crow-o-matic - General greasing on TDS - RIH in open hole, Ream last stand, Tag bottom at 3833m - Flush bottom 3 times, make up bit with 4T - Drilling f/ 3833m t 3934m as per directional driller instructions rotary and sliding.

01 Apr 2003

Drilling as per directional driller instructions rotary and sliding f/ 3934m to 4001m - MWD failure - MWD representative fault find - Circulate reciprocate pipe – Cont. fault find MWD Failure: no success – Cont. drilling f/ 4001m to 4058m, Losses= 2.2m3/hr.

02 Apr 2003

Cont. Drilling f/ 4058m to 4117m - Circulate for geological sample - Flow check and POOH f/ 4117m to 3964m - Back reaming f/ 3964m to 3195m for AND Logging - Flow check at shoe: Losses= 1.5m3.

03 Apr 2003

RIH f/ 3195m to bottom - Circulate B/up, Losses 2m3/hr - Flow check on TT: Losses= 2.3m3/hr - POOH to 3163m, Flow check and cont. POOH to 941m (top of BHA) – Cont. POOH to top of DC - Recover nuclear source – L/down 6”½ NMDC - Dump AND and ARC memories, L/down Power pulse + ARC + STAB + Float sub + Motor + Bit - Install TLC bushing - Prepare and P/up material in Schlumberger basket – R/up Logging tool Install Sheave Schlumberger in mast - Tools function test.

04 Apr 2003

Cont. with function tests of Schlumberger tools - Install X-over, hold PJSM and Risk assessment for radio active source, erect safety barriers - Install radioactive source RIH with 5”DP to 2776m - RIH to 3067m, Circulate every stand 1000 l/mn due to inclination – P/up one string stab + side entry sub, Connected 1 stand of 5”DP - Install sheave - RIH PWCH for tool testing, attempt to latch: no success. POOH PWCH at 2800m and RIH PWCH with circulation - Attempt to latch - POOH PWCH at 2800m and RIH same - Attempt to latch: no success - POOH PWCH at 2800m and RIH same, Latch: OK - Disconnected and POOH PWCH at 200m - Disconnected 1 stand 5”DP and side entry sub - Control PWCH on surface - RIH wet connector in pumping Disconnected and POOH PWCH at 200m - Disconnected 1 stand 5”DP + side entry sub + stab - POOH logging tools f/ 3067m to 2834m.

05 Apr 2003

POOH w/ Schlumberger logging tools to surface as per program, Monitor TT: Losses= 2 m3/h - Risk assessment, Clear rig floor, Schlumberger rep. remove radioactive source POOH logging tools - Schlumberger fault find tool failure, Monitor well on TT: Losses= 2 m3/h - Change out logging tool to back up tool, Function test same - Risk assessment, Clear rig floor, Erect barrier, Schlumberger rep. install radioactive source - RIH to 3067m logging string as per program, Fill up string every 10 stds (drift all 5"DP).

06 Apr 2003

Cont. RIH f/ 3067m to 3096m. Slip 19m drilling line, Reset Crow-o-matic, Circulate 1000 l/min - P/back 1 std - Install stab + side entry sub, R/up lower sheave - Schlumberger RIH - Latch to wet PWCH, Function test: Bad connection found between tools - Unlatch PWCH and pull to surface - Disconnect side entry sub, L/out PWCH and lower sheave POOH w/ 5”DP f/ 3067m to 2863m, Circulate at 1000 l/min - Cont. POOH w/ 5”DP to 2716m - Install string stab - M/up PWCH, Function test, Install side entry sub, RIH. PJSM - Install clamp on cable side entry sub, Pull test to 3000 lbs - RIH logging string to 3297m - POOH logging string f/ 3297m to 2778m - Unlatch PWCH and POOH PWCH to 200m.

07 Apr 2003

PJSM, Schlumberger cont. POOH w/ PWCH, L/out side entry sub + Stab + Lower sheave. Flow check, POOH f/ 2778m to logging tool then surface - PJSM, Risk assessment, Clear rig floor, Schlumberger rep - Remove radioactive source monitor well on TT: Losses= 2m3/hr - B/out and L/out all Schlumberger logging tool and send to tender – Clean and clear rig floor for safety, RIH 5”DP to 145m prior to change out rams for well control purpose - PJSM, Install VBR 4”½x7”, Continue fill up the well - POOH 5 stds 5”DP - Recover wear bushing - P/up and RIH test assy - Modification test assy Test BOP to 500 and 5000 psi - L/down test assy, Install XO and hose for TDS testing 6-12

COB-114

Drilling

Test rotary nose + upper I-BOP + lower I-BOP to 500 and 5000 psi - Reinstall wear bushing. 09 Apr 2003

Install wear busing, POOH R/ tool, L/out same - M/up 8”½ assy (Bit + Near Bit + 1 x 6”½ DC), RIH - P/up ARC, M/up to string, MWD rep. Program ARC tool - M/up Power pulse to ARC, Check communication - Cont. RIH MNDC + 1 std 5”DP, Commence shallow test MWD - Cont RIH w/ 5”HWDP to 3060m, Filling pipes every 600m - Draw work water cooling pipe work broken, Isolated draw work and change out, Monitor well on TT: Losses= 2m3/hr - Cont RIH to 3167m, Connect TDS - Hold PJSM, Slip and cut drill line, Reset Crow-o-matic, Clean and clear rig floor - Reaming f/3178m to 3330m - RIH f/ 3330m to 3375m - Reaming f/ 3375m to 3867m.

10 April 2003

Clean and clear rig floor for safety, PJSM prior Schlumberger job - P/up Schlumberger logging tool and function test - Fault finding, (probe failed) - P/up tool string and remove faulty probe - M/up probe to string and function test: OK - RIH logging tool and 5" DP, filling every stands to 2345m, Average losses 2.5m3/hrs. - PJSM prior RIH logging string from 2345m to 2450m, with drift 2.5”, Back Flow - Circulation at 2450m: 1000l/mn SPP 4000psi - RIH logging tools from 2450 to 2798m, Back Flow - Circulation to cure unbalanced well 2000 l/mn, SPP 1300psi - RIH from 2798m to 3062m, Fill up string every 5 Stds - RIH PWCH, Circulation as per Schlumberger instructions, Latch on, Test tool functions - Pull test on cable setting with 3000 lbs – Cont. RIH logging tools from 3062 to 3355m, fill up string every 5 stds.

11 April 2003

PJSM, Cont. Schlumberger logging operation f/ 3355 to 4110m - Circulation at 4110m: Q= 1200l/mn, SPP= 850psi - Flow check, POOH Schlumberger logging tools taking pressure reading - Excessive back flow, Connect TDS, Circ.: Q= 1200l/mn, SPP= 850psi - Clean and Clear rlg floor for safety – POOH logging tools and pressure test as per Schlumberger instructions f/ 4012m to 3476m (Connect TDS every std for back flow)

6-13

COB-114

Drilling

Bit Record BIT Nb

1

2

3

4R

5R

6R

26”

26”

26”

26”

26”

26”

BHA Nb

10

11

12

11

14

15

Bit maker

Security

Security

W-ford

Security

Security

Secutity

Bit type

S3SJ4

XN1C

Taper mill

XN1C

3SJ4

XN1C

Serial Nb

742648

742648

350

742648

734854

742648

Diameter

In

Nozzles

/32’

3x24+1x22

3x24+1x22

3x24+1x22

Open

3x24+1x22

TFA

In2

1.6966

1.6966

1.6966

3.1416

1.6966

1-1-1

1-1-1-S

1-1-1-S

1-1-1

1-1-1-S

IACD code Depth IN

m

184

185

177.6

188

191.7

210

Depth OUT

m

186

185

189

191.7

210

659

Meters drilled

m

2

0

11.4

3.7

18.3

449

Pumping time

hr

0.82

1.5

36.9

2.74

7.3

30.5

Time ON bottom

hr

0.55

1

20

2.0

5.35

26.1

Average ROP

m/hr

3.6

0.6

1.8

3.4

17.2

WOB min/Max

T

0.5

0.5

0.1/0.5

2.5

1/3.5

1/5

Flow Maxi

l/mn

1500

1200

1000

2400

2000

3500

SSP Maxi

Psi

250

255

140

600

250

1750

35

35

52

39

35

436

86

21

RPM min/Maxi Cumul RPM

krev

682 1-2-WT-G6-4-NO-TD

Grading Comments

6-14

COB-114

BIT Nb

Drilling

7

8

9

10

11

17”1/2

17”1/2

12”1/4

12”1/4

12”¼

BHA Nb

18

19

20

21

22

Bit maker

VAREL

HUGHES

VAREL

HUGHES

HUGHES

Bit type

SKS76

MX1

MKS59G2

MXC 18

NX28DX

Serial Nb

CP6642B

IL63JX

CP6669C

C71DH

G90DX

Diameter

In

Nozzles

/32’

9 x 18

3 x Open + 1 x 22

9 x 16

3 x 24 + 1 x 16

3x22

TFA

In2

2.2365

2.7274

1.7667

1.5217

1.1136

4-1-7

5-2-7

IACD code

1-1-1

Depth IN

m

659

2008

2160

2776

3105

Depth OUT

m

2008

2160

2776

3105

3190

Meters drilled

m

1349

152

616

329

85

Pumping time

hr

103.6

26.8

117

87.4

83.1

Time ON bottom

hr

72.7

13.0

82.9

73.6

72.2

Average ROP

m/hr

18.6

11.7

7.4

4.5

1.2

WOB min/Maxi

T

1/ 10

1/ 6

1/ 8

5/ 20

2/ 16

Flow Maxi

l/mn

3500

2900

2850

2600

2500

SSP Maxi

Psi

3560

3500

4100

4150

4100

170/ 260

170/ 260

70/ 130

70/135

70/135

1116

172

554

381

363

Grading

5-8-BT-A-X2-CT-PR

2-1-WT-A-10-NO-TD

0-2-BT-G-X2-JD-PR

3-8-BT-C-E6-LT-TQ

1-2-BT-G-E3-WT-TD

Comments

Slow ROP

17”1/2 TD

Slow ROP

Slow ROP

End of phase

RPM min/Maxi Cumul RPM

krev

6-15

COB-114

BIT Nb

Drilling

12

13

14

15

8”1/2

8”1/2

8”1/2

8”1/2

BHA Nb

23

24

25

26

Bit maker

SMITH

Christensen

REED

HUGHES

Bit type

10MFPSR

HCM606

EHP51AK

MX 20

Serial Nb

MJ5331

56756

ER5501

6013114

Diameter

In

Nozzles

/32’

Open

6 x 16

Open

3 x 24

TFA

In2

2.3562

1.1778

2.3562

1.3254

4-3-7-X

M-3-2-3

5-1-7-W

5-1-7

IACD code Depth IN

m

3190

3454

3524

3833

Depth OUT

m

3454

3524

3833

4117

Meters drilled

m

264

70

309

284

Pumping time

hr

43.5

16.2

54.9

64

Time ON bottom

hr

24.3

13.4

37.6

39

Average ROP

m/hr

10.6

5.2

8.2

7.3

WOB min/Maxi

T

2/ 8

2/ 4

2/ 12

2/ 12

Flow Maxi

l/mn

1900

1800

1850

1850

SSP Maxi

Psi

2100

2200

2450

2450

160/ 270

160/ 260

160/ 280

160/ 280

568

342

762

877

3-5-BT-G-E2-LT-RIG

0-2-WT-G-X1-JD-TQ

4-8-LT-G-E3-BT-HR

1-1-WT-A-E1-NO-TD

RPM min/Maxi Cumul RPM Grading

krev

Comments

6-16

COB-114

Drilling

Drilling Assembly Record BHA Nb

Phase diameter

Bit diameter

10

26”

26” Total le n g t h

Description

O.D

I.D

Length

LANDING SUB

6¼

2 15/16

0.64

107.21

X -Over

6¼

3

0.55

106.57

3XDC6”½

6 5/16

2 7/8

0.61

27.77

X-Over

7 3/4

2¾

0.89

78.25

DC8”¼

8 3/16

2 13/16

9.35

77.36

JAR

8

3

9.79

68.01

3XDC8”¼

8¼

2 13/16

27.65

58.22

X-Over

23/4

7 3/4

0.93

30.57

2XDC9”½

9½

3

18.62

29.64

ORIENTING SUB

9½

3.00

0.66

11.02

FLOAT SUB

9½

0.55

10.36

Mud Motor

9½

9.24

9.81

26”BIT

26”

6.25

0.57

6-17

COB-114

Drilling

BHA Nb

Phase diameter

Bit diameter

11

26”

26” Total le n g t h

Description

O.D

I.D

Length

LANDING SUB

6¼

2 15/16

0.64

116.38

1HWDP

5”

3

9.18

115.74

X -Over

6¼

3

0.55

106.57

3XDC6”½

6 5/16

2 7/8

0.61

27.77

X-Over

7 3/4

2¾

0.89

78.25

DC8”¼

8 3/16

2 13/16

9.35

77.36

JAR

8

3

9.79

68.01

3XDC8”¼

8¼

2 13/16

27.65

58.22

X-Over

23/4

7 3/4

0.93

30.57

2XDC9”½

9½

3

18.62

29.64

ORIENTING SUB

9½

3.00

0.66

11.02

FLOAT SUB

9½

0.55

10.36

Mud Motor

9½

9.24

9.81

26”BIT

26”

2 7/825

0.57

6-18

COB-114

Drilling

BHA Nb

Phase diameter

Bit diameter

12

26”

26” Total le n g t h

Description

O.D

I.D

Length

LANDING SUB

6¼

2 15/16

0.64

107.20

1HWDP 5”

6½

3

9.18

115.74

XO

6¼

3

0.55

106.56

3XDC 6½

6 5/16

2 7/8

9.26

87.50

XO

7 ¾-

2 3/4

0.89

78.24

DC 8¼

6 5/16

2 7/8

27.7

87.50

JAR

8

3

9.79

68.00

3XDC 8¼

8¼-

2 13/16

9.37

27.65

XO

7 ¾-

2 3/4

0.93

30.56

2 x DC 9½

9 5/8-

3 1/16

18.61

29.63

ORIENTING SUB

9½

37/8

0.66

11.02

FLOAT SUB

9½

3”

0.55

10.36

Mud Motor

9½

2 7/8

9.24

9.81

26”bit

26’

0.57

0.57

6-19

COB-114

Drilling

BHA Nb

Phase diameter

Bit diameter

13

26”

26” Total le n g t h

Description

O.D

I.D

Length

LANDING SUB

6¼

2 15/16

0.64

115.04

1HWDP 5”

6½

3”

9.18

114.40

XO

6¼

3”

0.55

105.22

DC 6½

6 5/16

2 7/8

27.77

104.67

XO

7¾

2¾

0.89

76.90

DC 8¼

8 3/16

2 13/16

9.35

76.01

JAR(new)

8”

3”

9.80

66.68

3XDC 8¼

8¼

2 13/16

27.65

56.86

BUMPER SUB

7¾

3 1/16

1.50

29.21

XO

7¾

2¾

0.93

27.71

1DC 9½

9 5/8

3 1/16

9.44

26.78

STAB 26”

9 3/4

3”

2.36

`17.34

1DC 9½

9½

3 1/8

9.17

14.98

STAB 26”

9 5/16

3”

2.30

5.81

PONY DC 9½

9 5/8

2 3/4

0.58

3.51

BIT SUB

9½

2 3/4

0.91

2.93

TAPER MILL 26”

8”

2 13/16

2.02

2.02

6-20

COB-114

Drilling

BHA Nb

Phase diameter

Bit diameter

14

26”

26” Total le n g t h

Description

O.D

I.D

Length

LANDING SUB

6¼

2 15/16

0.61

116.37

1 HWDP 5”

6½

3”

9.18

115.76

XO

6¼

3”

0.55

106.58

3 x DC 6½

6 5/16

2 7/8

27.77

106.03

XO

7¾

2¾

0.89

78.26

DC8¼

8 3/16

2 13/16

9.35

77.37

JAR

8”

3”

9.80

68.02

3 x DC 8¼

8¼

2 13/16

27.65

58.22

XO

7¾

2¾

0.93

30.57

2 x DC 9½

9 5/8

3 1/16

18.62

29.64

ORIENTING SUB

9½

3 7/8

0.66

11.02

FLOAT SUB

9½

3”

0.55

10.36

MOTOR

9½

2 7/16

9.24

9.81

0.57

0.57

BIT

6-21

COB-114

Drilling

BHA Nb

Phase diameter

Bit diameter

16

26”

26” Total

Description

O.D

I.D

le n g t h

Length

HWDP 5”

111.39

LANDING SUB

6¼

2 15/16

0.61

111.39

1HWDP 5”

6½

3”

9.18

110.78

XO

6¼

3”

0.55

101.60

DC 6½

6 5/16

2 7/8

27.77

101.05

XO

7¾

2¾

0.89

73.28

DC 8¼

8 3/16

2 13/16

9.35

72.39

JAR(new)

8”

3”

9.80

63.04

DC 8¼

8 3/16

2 13/16

27.65

53.24

XO

7¾

2¾

0.93

25.59

STAB 26”

9 5/16

3”

2.30

24.66

1DC 9½

9 5/8

3 1/16

9.45

22.36

STAB 26”

9¾

3”

2.36

12.91

1DC 9½

9½

3 1/8

9.17

10.55

BIT SUB

9½

2 7/8

0.81

1.38

0.57

0.57

BIT 26” rerun

6-22

COB-114

Drilling

BHA Nb

Phase diameter

Bit diameter

17

26”

26” Total le n g t h

Description

O.D

I.D

Length

LANDING SUB

6¼

2 15/16

0.61

116.51

1 HWDP 5”

6½

3”

9.18

115.90

XO

6¼

3”

0.55

106.72

3 x DC 6½

6 5/16

2 7/8

27.77

106.17

XO

7¾

2¾

0.89

78.40

DC8¼

8 3/16

2 13/16

9.35

77.51

JAR

8”

3”

9.80

68.16

3 x DC 8¼

8¼

2 13/16

27.65

58.36

XO

7¾

2¾

0.93

30.71

2 x DC 9½

9 5/8

3 1/16

18.62

29.78

ORIENTING SUB

9½

3 7/8

0.66

11.16

FLOAT SUB

9½

3”

0.55

10.50

MOTOR

9½

2 7/16

9.38

9.95

BIT 26”

0.57

6-23

COB-114

Drilling

BHA Nb

Phase diameter.

Bit diameter

18

17”1/2

17”1/2 Total le n g t h

Description

O.D

I.D

Length

Landing sub.

6’1/2

2”5/8

0.65

108.3

5” HWDP

6”5/8

3”

9.07

107.65

X/ O

6”1/4

3”1/4

0.83

98.58

2 x 8”1/4 DC

8”

2”7/8

18.58

97.75

Jar

8”

3”

9.75

79.17

3 x 8”1/4 DC

8”

2”13/16

27.65

69.42

X/ O

9”1/2

2”3/4

0.93

41.77

1 x 9”1/2 DC

9”1/2

3”1/8

9.17

40.84

Orienting Sub

9”1/2

3”7/8

0.66

31.67

NMDC

9”1/2

3”

9.42

31.01

MWD

9”1/2

3”1/2

8.51

21.59

NMDC

9”1/2

3”1/4

1.02

13.08

17” Stab.

9”1/2

3”

1.63

12.06

Float sub

9”1/2

3”

0.55

10.43

Mud Motor

9”7/16

2”3/8

9.38

9.88

17”1/2 Bit

8”3/4

0.50

6-24

COB-114

Drilling

BHA Nb

Phase diameter

Bit diameter

19

17”1/2

17”1/2 Total le n g t h

Description

O.D

I.D

Length

Landing sub.

6’1/2

2”5/8

0.65

108.3

5” HWDP

6”5/8

3”

9.07

107.65

X/ O

6”1/4

3”1/4

0.83

98.58

2 x 8”1/4 DC

8”

2”7/8

18.58

97.75

Jar

8”

3”

9.75

79.17

3 x 8”1/4 DC

8”

2”13/16

27.65

69.42

X/ O

9”1/2

2”3/4

0.93

41.77

1 x 9”1/2 DC

9”1/2

3”1/8

9.17

40.84

Orienting Sub

9”1/2

3”7/8

0.66

31.67

NMDC

9”1/2

3”

9.42

31.01

MWD

9”1/2

3”1/2

8.51

21.59

NMDC

9”1/2

3”1/4

1.02

13.08

17” Stab.

9”1/2

3”

1.63

12.06

Float sub

9”1/2

3”

0.55

10.43

Mud Motor

9”7/16

2”3/8

9.38

9.88

17”1/2 Bit

8”3/4

0.50

6-25

COB-114

Drilling

BHA Nb

Phase diameter

Bit diameter

20

17”1/2

17”1/2 Total le n g t h

Description

O.D

I.D

Length

17 x 5” HWDP

5”

3”

154.89

284.58

X/ O

6”1/4

3”

0.61

129.69

1 x 5” HWDP

5”

3”

9.14

129.08

X/ O

6”1/4

2”13/16

0.86

119.94

3 x 6”1/4 DC

6”1/4

2”13/16

27.72

119.08

X/ O

6”1/4

2”13/16

0.79

91.36

X/ O

7”1/4

3”

0.59

90.57

2 x 8” DC

8”

2”13/16

18.89

89.98

Jar

8”

3”

9.77

71.09

3 x 8”1/4 DC

8”1/4

2”13/16

28.33

61.32

NMDC

8”

3”

9.42

32.99

MWD

8”

3”

8.47

23.57

SNMDC

8”

3”

2.61

15.10

12”1/4 Stab.

8”5/16

2”13/16

2.45

12.49

Float sub

8”

2”13/16

0.46

10.04

Mud Motor

9”5/8

3”

9.24

9.58

12”1/4 Bit

0.34

6-26

COB-114

6-27

Drilling

COB-114

Drilling

BHA Nb

Phase diameter

Bit diameter

21

17”1/2

17”1/2 Total le n g t h

Description

O.D

I.D

Length

17 x 5” HWDP

5”

3”

154.89

285.10

X/ O

6”1/4

3”

0.61

130.21

1 x 5” HWDP

5”

3”

9.14

129.56

X/ O

6”1/4

2”13/16

0.86

120.42

3 x 6”1/4 DC

6”1/4

2”13/16

27.72

119.56

X/ O

6”1/4

2”13/16

0.79

91.84

X/ O

7”1/4

3”

0.59

91.05

2 x 8”1/4 DC

8”

2”13/16

18.89

90.46

Jar

8”

3”

9.78

71.57

3 x 8” DC

8”1/4

2”13/16

28.33

61.79

NMDC

8”

3”

9.42

33.46

MWD

8”

3”

8.47

24.04

SNMDC

8”

3”

2.61

15.57

12”1/4 Stab.

8”5/16

2”13/16

2.45

12.96

Float sub

8”

2”13/16

0.46

10.04

Mud Motor

9”5/8

3”

9.72

10.05

12”1/4 Bit

12”1/4

0.34

6-28

COB-114

Drilling

BHA Nb

Phase diameter

Bit diameter

22

12¼"

12¼" Total le n g t h

Description

O.D

I.D

Length

Landing sub

6¼”

3”

0.65

131.47

1 x 5”HWDP

6¼”

2”13/16

9.14

130.82

X/ O

6¼”

2”13/16

0.86

121.68

3 x 6”½ DC

6¼”

2”13/16

27.72

120.82

2 x X-over

6”1/4

3”

0.59/0.79

93.10

3 x 8”DC

8”

2”13/16

18.89

91.72

Hydro jar

8”

3”

9.78

72.83

3 x 8”DC

8.25”

2”13/16

28.33

63.05

1 x 8”NMDC

8”

2”7/8

9.42

34.72

Power Pulse HF

8”15/32

2”7/8

8.47

25.30

2 x 8”SNMDC

8”

2”13/16

1.36/2.61

16.83

Stab 12”1/8

8”5/16

2”13/16

2.35

12.86

8” Float Sub

8”

3”

0.46

10.51

Motor (0.00 deg )

9”

9.72

10.05

12 ¼” Bit

12”1/4

0.39

6-29

COB-114

Drilling

BHA Nb

Phase diameter

Bit diameter

23

12¼"

12¼" Total le n g t h

Description

O.D

I.D

Length

9 x 5”HWDP

5”

3”

86.40

304.53

Hydraulic jar 6 ½”

6”1/2

3”

9.86

218.13

18 x 5” HWDP

5”

3”

172.80

208.27

NMDC 6 ½”

6”1/2

2”13/16

9.60

35.47

Power pulse 6 ¾”

6”3/4

2”7/8

8.94

25.87

ARC 6”

6”1/2

2”13/32

6.00

16.93

Stabilizer 8”3/8”

6”1/2

2”13/16

1.76

10.93

Float sub 6½”

6”1/2

2”13/16

0.69

9.17

Motor (1°50)

8”3/8

8.08

8.48

8½” insert bit

8”1/2

0.40

0.40

2.25”

6-30

COB-114

Drilling

BHA Nb

Phase diameter

Bit diameter

24

8½"

8½" Total le n g t h

Description

O.D

I.D

Length

8 x 5”HWDP

5”

3”

73.23

941.68

Landing sub

6”1/4

2”5/8

0.65

868.45

1 x 5”HWDP

5”

3”

9.17

867.80

JAR

6”1/2

3”

9.86

858.63

18 x 5”HWDP

6”1/2

3”

164.03

848.77

69 x 5” DP

6”9/16

3”

649.88

684.74

1 x 6”½NMDC

6”1/2

3”

9.05

34.86

Power Pulse

6”7/8

2.8125

8.85

25.81

ARC-6

6”7/8

2.812

5.85

16.96

8”1/4 Stab

6”9/16

2.8125

1.95

11.01

Float sub

6”1/2

2.75

0.69

9.06

Motor (1.15°)

6”3/4

8.08

8.37

8½” Bit

8”1/2

0.29

6-31

COB-114

Drilling

BHA Nb

Phase diameter

Bit diameter

25

12¼"

12¼" Total le n g t h

Description

O.D(m)

I.D(m)

Length

8 x 5”HWDP

5”

3”

73.23

942.59

Landing sub

6”1/4

2”5/8

0.65

868.45

1 x 5”HWDP

5”

3”

9.17

867.80

JAR

6”1/2

3”

9.86

858.63

18 x 5”HWDP

5”

3”

164.03

848.77

69 x 5”DP

5”

3”

649.88

684.74

1 x 6”½NMDC

6”1/2

3”

9.05

34.86

Power Pulse

6”7/8

2”13/16

8.85

25.81

ARC-6

6”7/8

2”13/16

5.85

16.96

8”1/4 Stab

6”9/16

2”13/16

2.89

11.92

Float sub

6”1/2

2”3/4

0.69

9.06

Motor (1.15°)

6”3/4

8.08

8.37

8½” Bit

8”1/2

0.26

6-32

COB-114

Drilling

BHA Nb

Phase diameter

Bit diameter

26

8 ½”

8½” Total le n g t h

Description

O.D

I.D

Length

8 x 5”HWDP

5”

3”

73.23

1199.78

Landing sub

6”1/4

2”5/8

0.65

1126.55

1 x 5”HWDP

5”

3”

9.17

1125.90

JAR

6”1/2

3”

9.86

1116.73

18 x 5”HWDP

5”

3”

164.03

1106.87

96 x 5”DP

5”

3”

902.17

942.84

1 x 6½”NMDC

6.5

3”

9.05

40.67

AND w/ 8”1/4 STAB

4”5/8

2”3/4

6.19

31.62

ARC-6

6”7/8

2”13/16

6.33

17.10

8.25 Stab

6”9/16

2”13/16

1.76

10.77

Float sub

6”1/2

2”3/4

0.69

9.01

Motor (1.15°)

6”3/4

8.08

8.32

8½” Bit

8.5

0.24

6-33

COB-114

Drilling

Mud Record 26” Hole Date

05/ 02

06/ 02

07/ 02

08/02

09/ 02

10/ 02

11/ 02

No rapport

13

14

15

16

17

18

19

Depth

186

186

185

191

225

471

659

Type

Gel/Poly

Gel/Poly

Gel/Poly

Gel/Poly

Gel/Poly

Gel/Poly

M.W. (sg)

1.04

1.05

1.05

1.05

1.07

1.14

1.14

F.V.

65

63

66

85

55

56

61

P.V.

16

15

13

14

12

10

14

Y.P. (lbs/100ft2)

30

30

40

40

26

30

34

Gel 0 (lbs/100ft2)

15

14

18

19

12

16

16

Gel 10 (lbs/100ft2)

25

25

27

32

21

26

32

Fann 600

62

60

66

68

66

58

62

Fann 300

46

45

53

54

53

43

48

Fann 200

43

42

48

50

48

39

43

Fann 100

38

37

40

38

40

32

35

Oil/ Water (%)

-

-

-

HPHT Filt . (ml/30mn)

-

-

-

Sand (%)

-

6-34

Gel/Poly

COB-114

Drilling

17”1/2 hole Date

17/ 02

18/ 02

19/ 02

20/ 02

21/ 02

22/ 02

23/ 02

No rapport

25

26

27

28

29

30

31

Depth

969

1336

1599

1947

2008

2120

2160

Type

Carbo-drill Carbo-drill Carbo-drill Carbo-drill Carbo-drill Carbo-drill Carbo-drill

M.W. (sg)

1.12

1.23

1.22

1.23

1.25

1.30

1.30

F.V.

76

85

80

80

70

78

80

P.V.

38

39

40

40

44

45

44

Y.P. (lbs/100ft2)

22

23

22

20

18

20

20

Gel 0 (lbs/100ft2)

25

21

18

18

14

19

18

Gel 10 (lbs/100ft2)

49

50

49

50

50

51

50

Fann 600

98

101

102

100

106

110

108

Fann 300

60

62

62

60

62

65

64

Fann 200

45

44

43

44

46

49

48

Fann 100

31

29

27

29

28

30

30

HPHT Filt . (ml/30mn

3.0

3.8

3.6

4.0

3.5

3.3

3.2

Water (%)

24

23

23

23

22

21

21

Oil (%)

59

61

61

60

61

62

62

Solids (%)

17

16

16

17

17

17

17

6-35

COB-114

Drilling

12”¼ hole Date

01/ 03

02/ 03

03/ 03

04/ 03

05/ 03

06/ 03

07/ 03

08/ 03

09/ 03

No rapport

37

38

39

40

41

42

43

44

45

Depth

2213

2405

2461

2623

2721

2776

2808

2915

3018

Carbo-Drill

Carbo-Drill

Carbo-Drill

Carbo-Drill

Carbo-Drill

Type

Carbo-Drill Carbo-Drill

Carbo-Drill Carbo-Drill

M.W. (sg)

1.35

1.34

1.35

1.35

1.39

1.40

1.45

1.50

1.55

F.V.

97

100

83

73

94

105

78

84

94

P.V.

38

40

38

39

46

45

49

48

50

Y.P. (lbs/100ft2)

20

23

23

19

22

25

22

22

24

Gel 0 (lbs/100ft2)

16

18

19

15

21

24

26

26

28

Gel 10 (lbs/100ft2)

37

41

44

43

48

51

52

50

54

Fann 600

96

103

99

97

114

115

120

118

124

Fann 300

58

63

61

58

68

70

71

70

74

Fann 200

41

41

42

38

43

52

43

51

56

Fann 100

26

36

26

19

29

33

29

32

35

HPHT Filt . (ml/30mn

2.8

3.1

2.8

2.6

2.4

2.8

3.2

2.8

2.6

Water (%)

21

21

18

16

16

16

16

16

17

Oil (%)

61

62

64

66

64

63

63

62

59

Solids (%)

18

17

18

18

20

21

21

22

24

6-36

COB-114

Drilling

12”1/4 hole Date

10/ 03

11/ 03

12/03

13/03

14/ 03

15/03

16/03

17/03

18/03

No rapport

46

47

48

49

50

51

52

53

54

Depth

3077

3100

3127

3152

3177

3190

3190

3190

3190

Carbo-Drill

Carbo-Drill

Carbo-Drill

Type

Carbo-Drill Carbo-Drill

Carbo-Drill Carbo-Drill

Carbo-Drill Carbo-Drill

M.W. (sg)

1.55

1.55

1.55

1.55

1.58

1.58

1.58

1.58

1.58

F.V.

72

72

76

71

74

64

67

64

67

P.V.

44

47

48

41

42

40

40

40

40

Y.P. (lbs/100ft2)

21

20

20

22

20

16

15

15

14

Gel 0 (lbs/100ft2)

23

25

23

22

22

15

14

14

14

Gel 10 (lbs/100ft2)

49

54

49

46

47

36

36

36

35

Fann 600

109

114

116

104

104

96

95

95

94

Fann 300

65

67

68

63

62

56

55

55

54

Fann 200

49

49

47

44

41

39

39

39

38

Fann 100

31

29

29

27

26

24

23

23

22

HPHT Filt . (ml/30mn

2.6

3.7

2.7

2.6

2.6

2.4

2.6

2.6

2.6

Water (%)

15

13

18

18

19

18

18

18

18

Oil (%)

61

62

82

82

81

82

82

82

82

Solids (%)

24

25

23

25

26

26

25

25

25

6-37

COB-114

Drilling

8”1/2 hole Date

22/ 30

23/ 03

24/ 03

25/ 03

26/ 30

27/ 03

28/ 03

29/ 03

No rapport

58

59

60

61

62

63

64

65

Depth

3250

3418

3454

3480

3524

3524

3652

3785

Type

Gel/Poly

Gel/Poly

Gel/Poly

Gel/Poly

Gel/Poly

Gel/Poly

Gel/Poly

Gel/Poly

M.W. (sg)

1.03

1.04

1.05

1.05

1.05

1.05

1.05

1.05

F.V.

53

64

64

61

61

61

69

60

P.V.

16

21

22

18

18

18

20

21

Y.P. (lbs/100ft2)

18

26

24

22

22

22

25

22

Gel 0 (lbs/100ft2)

4

5

5

4

4

4

6

4

Gel 10 (lbs/100ft2)

9

8

9

7

7

7

12

7

Fann 600

50

68

68

58

58

58

65

64

Fann 300

34

47

46

40

40

40

45

43

Fann 200

25

38

37

32

32

32

36

34

Fann 100

18

25

25

21

21

21

26

22

HPHT Filt . (ml/30mn

5.4

6

6

6

5

5

5

5

Water (%)

97

96

95

96

96

96

96

96

Oil (%)

---

---

---

---

---

---

---

---

Solids (%)

3

4

5

4

4

4

4

4

6-38

COB-114

Drilling

8”1/2 hole

Date

30/ 03

31/ 03

01/ 04

02/ 04

No rapport

66

67

68

69

Depth

3833

3934

4058

4117

Type

Gel/Poly

Gel/Poly

Gel/Poly

Gel/Poly

M.W. (sg)

1.06

1.05

1.06

1.06

F.V.

61

59

60

60

P.V.

24

20

20

20

Y.P. (lbs/100ft2)

24

20

20

20

Gel 0 (lbs/100ft2)

2

4

3

3

Gel 10 (lbs/100ft2)

7

6

5

5

Fann 600

72

60

60

60

Fann 300

48

40

40

40

Fann 200

38

29

20

29

Fann 100

26

20

19

19

HPHT Filt . (ml/30mn

5

5

4.3

4.3

Water (%)

96

96

96

96

Oil (%)

---

---

---

---

Solids (%)

4

4

4

4

6-39

COB-114

Drilling

Deviation Record: 26” section MD (m) 0.00 23.70 33.10 43.10 52.70 62.20 71.80 81.40 90.90 100.50 110.10 119.70 129.30 138.80 148.40 158.00 167.60 171.80 193.00 202.00 212.00 221.00 229.00 243.00 257.00 272.00 287.00 300.00 314.00 330.00 345.00 360.00 374.00 384.00 394.00 403.00 412.00 421.00 430.00 439.00 448.00 467.00 477.00 486.00 496.00

Incl (°) 0.00 0.06 0.24 0.26 0.27 0.25 0.16 0.17 0.18 0.16 0.19 0.24 0.24 0.29 0.31 0.53 1.30 1.64 1.00 0.99 0.93 1.07 1.39 2.49 2.89 3.2 2.94 3.36 3.79 3.69 4.04 3.02 2.35 2.24 2.03 1.84 1.77 1.89 1.76 1.85 2.13 1.94 1.89 1.91 2.07

Azim (°) 0.00 99.81 32.44 5.30 355.34 23.92 23.52 8.11 19.25 358.33 6.41 24.46 23.73 17.71 347.92 315.18 316.57 315.79 46.10 37.69 67.18 91.04 105.5 127.52 126.72 133.02 130.84 141.78 141.28 139.44 139.4 136.55 138.04 135.44 133.33 133.73 129.83 129.78 126.73 123.66 121.19 129.22 132.32 130.68 130.41

TVD (m RKB) 0.00 23.70 33.10 43.10 52.70 62.20 71.80 81.40 90.90 100.50 110.10 119.70 129.30 138.80 148.40 158.00 167.60 171.80 193.00 202.00 212.00 221.00 229.00 243.00 257.00 271.90 286.90 299.90 313.90 329.80 344.80 359.80 373.80 383.80 393.70 402.70 411.70 420.70 429.70 438.70 447.70 466.70 476.70 485.70 495.70

TVD m MSL 0.00 -3.30 6.10 16.10 25.70 35.20 44.80 54.40 63.90 73.50 83.10 92.70 102.30 111.80 121.40 131.00 140.60 144.80 166.00 175.00 185.00 194.00 202.00 216.00 230.00 244.90 259.90 272.90 286.90 302.80 317.80 332.80 346.80 356.80 366.70 375.70 384.70 393.70 402.70 411.70 420.70 439.70 449.70 458.70 468.70

6-40

VSec (m) 0.00 -0.01 0.00 0.04 0.08 0.12 0.14 0.16 0.19 0.21 0.24 0.27 0.30 0.33 0.38 0.44 0.58 0.68 1.20 1.40 0.80 -0.00 -0.6 -1.5 -1.7 -2.2 -2.5 -3.5 -4.0 -4.6 -5.2 -5.6 -6.2 -6.3 -6.3 -6.5 -6.2 -6.4 -6.2 -5.9 -5.8 -7.3 -8.0 -7.9 -8.1

N/-S (m) 0.00 -0.00 0.01 0.05 0.10 0.14 0.17 0.20 0.23 0.25 0.28 0.32 0.35 0.39 0.44 0.50 0.61 0.69 -1.20 -1.30 -1.4 -1.4 -1.4 -1.1 -0.2 -0.8 -0.3 -0.8 -1.5 -2.3 -3 -3.7 -4.2 -4.5 -4.8 -5 -5.2 -5.3 -5.5 -5.7 -5.9 -6.2 -6.5 -6.7 -6.9

E/-W (m) 0.00 0.01 0.03 0.04 0.04 0.05 0.06 0.07 0.08 0.08 0.08 0.09 0.11 0.12 0.13 0.09 -0.02 -0.09 1.20 1.30 1.4 1.6 1.8 2.2 3.3 3.3 3.9 4.4 4.9 5.6 6.2 6.8 7.3 7.5 7.8 8 8.2 8.5 8.7 8.9 9.2 9.7 10 10.2 10.5

DLS (°/30m) 0.08 0.71 0.36 0.15 0.41 0.28 0.14 0.11 0.20 0.12 0.26 0.01 0.18 0.49 0.99 2.41 2.43 0.00 0.20 0.46 0.48 0.55 0.88 0.30 0.30 0.19 0.56 0.24 0.08 0.25 0.69 0.48 0.15 0.22 0.21 0.16 0.13 0.18 0.15 0.32 0.17 0.12 0.06 0.16

COB-114

MD (m) 505.00 515.00 524.00 534.00 543.00 553.00 562.00 571.00 581.00 590.00 599.00 608.00 618.00 627.00 636.00 645.00

Incl (°) 2.16 2.18 2.28 2.38 2.33 1.35 1.29 1.24 0.83 0.64 0.57 0.59 0.75 0.92 1.02 1.22

Azim (°) 129.92 129.11 128.45 126.96 127.8 128.88 127.15 130.16 118.12 112.35 104.15 109.17 103.88 101.96 100.31 100.55

TVD (m RKB) 504.70 514.70 523.70 533.70 542.70 552.60 561.60 570.60 580.60 589.60 598.60 607.60 617.60 626.60 635.60 644.60

TVD m MSL 477.70 487.70 496.70 506.70 515.70 525.60 534.60 543.60 553.60 562.60 571.60 580.60 590.60 599.60 608.60 617.60

6-41

VSec (m) -8.3 -8.4 -8.4 -8.4 -8.8 -9.2 -9.0 -9.7 -7.2 -5.8 -3.8 -5.1 -3.80 -3.30 -2.90 -2.90

Drilling

N/-S (m) -7.1 -7.3 -7.6 -7.8 -8 -8.2 -8.4 -8.5 -8.6 -8.6 -8.7 -8.7 -8.7 -8.8 -8.8 -8.8

E/-W (m) 10.7 11 11.3 11.6 11.9 12.2 12.3 12.5 12.6 12.7 12.8 12.9 13 13.1 13.3 13.5

DLS (°/30m) 0.10 0.03 0.11 0.11 0.07 0.98 0.08 0.09 0.46 0.12 0.12 0.06 0.17 0.19 0.11 0.22

COB-114

Drilling

Deviation Record: 17”1/2 section MD (m) 669.00 683.00 696.00 713.00 726.00 754.00 782.00 809.00 838.00 866.00 894.00 922.00 950.00 979.00 1007.00 1035.00 1062.00 1091.00 1119.00 1147.00 1175.00 1203.00 1231.00 12159.00 1287.00 1315.00 1343.00 1371.00 1399.00 1426.00 1455.00 1482.00 1511.00 1539.00 1567.00 1595.00 1623.00 1651.00 1707.00 1735.00 1763.00 1791.00 1819.00 1847.00 1875.00

Incl (°) 1.52 2.07 2.50 3.37 3.94 3.35 5.83 7.11 7.64 7.98 8.17 8.89 9.43 10.35 11.78 13.73 17.97 16.64 18.23 19.00 20.87 22.54 24.60 25.15 24.65 24.48 24.19 24.19 25.01 25.19 24.77 24.48 24.04 24.97 24.84 24.39 24.07 23.64 24.22 23.45 23.49 23.17 22.92 22.21 20.53

Azim (°) 91.5 122.25 127.89 140.67 143.3 154.72 156.7 161.88 159.46 164.9 168.11 170.59 174.13 174.65 173.91 174.89 172.47 171.28 172.42 171.54 172.3 173.64 171.96 171.83 172.18 172.69 172.15 172.15 173.2 173.45 172.78 173.69 173.52 173.50 173.69 174.32 174.13 174.58 173.48 173.41 173..84 174.01 174.34 174.57 173.02

TVD (m RKB) 668.00 682.60 695.00 712.60 725.60 753.50 781.40 802.80 837.00 864.70 892.50 920.20 947.80 976.40 1003.80 1031.20 1057.30 1085.20 1111.90 1138.50 1164.80 1190.80 1216.00 1241.90 1267.30 1292.70 1318.20 1343.80 1369.20 1393.70 1420.00 1444.50 1471.00 1496.40 1521.80 1547.30 1572.80 1598.40 1649.60 1675.20 1700.90 1726.60 1752.40 1778.20 1804.30

TVD m MSL 641.00 655.60 668.00 685.60 698.60 726.50 754.40 775.80 810.00 837.70 865.50 893.20 920.80 949.40 976.80 1004.20 1030.30 1058.20 1084.90 1111.50 1137.80 1163.80 1189.00 1214.90 1240.30 1265.70 1291.20 1316.80 1342.20 1366.70 1393.00 1417.50 1444.00 1469.40 1494.80 1520.30 1545.80 1571.40 1622.60 1648.20 1673.90 1699.60 1725.40 1751.20 1777.30

6-42

VSec (m) -0.40 -9.10 -10.80 -14.20 -15.40 -18.80 -20.90 -24.10 -26.90 -31.00 934.90 -38.90 -43.10 -47.70 -52.70 -58.90 -64.40 -71.70 -80.70 -88.50 -98.00 -108.20 -118.90 -130.40 -142.10 -153.60 -164.90 -176.20 -188.10 -199.60 -211.40 -222.90 -234.60 -246.10 -257.40 -269.70 -281.00 -292.50 -314.40 -325.70 -336.90 -348.00 -359.50 -369.90 -378.90

N/-S (m) 8.90 -9.00 -9.30 -9.90 -10.60 -12.10 -14.10 -17.00 -20.50 -24.10 -27.90 -32.00 -36.40 -41.40 -46.70 -52.90 -59.50 -67.40 -75.70 -84.50 -94.00 -104.20 -115.40 -127.00 -138.70 -150.20 -161.70 -173.00 -184.60 -196.00 -208.10 219.30 -231.10 -242.70 -254.40 -266.00 -277.40 -288.70 -311.30 322.50 333.60 -344.60 -355.50 366.20 376.40

E/-W (m) 14.00 14.40 14.90 15.50 16.00 16.90 17.80 18.90 20.10 21.30 22.20 22.90 23.50 24.00 24.60 25.20 25.90 27.00 28.20 29.50 30.80 32.00 33.40 35.10 36.70 38.30 39.90 41.40 42.90 44.30 45.70 47.10 48.40 49.70 51.00 52.20 53.40 54.50 56.90 58.20 59.40 60.60 61.70 62.70 63.80

DLS (°/30m) 0.15 0.78 0.37 0.64 0.46 0.33 0.89 0.52 0.21 0.29 0.17 0.29 0.29 0.32 0.51 0.70 0.51 0.59 0.58 0.29 0.67 0.63 0.78 0.20 0.19 0.16 0.11 0.11 0.33 0.09 0.17 0.18 0.15 0.33 0.05 0.19 0.12 0.17 0.13 0.28 0.06 0.12 0.10 0.26 0.63

COB-114

MD (m) 1903.00 1931.00 1959.00 1987.00 2014.00 2042.00 2070.00 2099.00 2127.00 2142.00

Incl (°) 19.79 18.58 17.13 16.96 15.84 14.38 12.69 10.63 8.69 8.32

Azim (°) 171.63 170.16 168.01 168.66 169.45 169.92 170.37 170.14 170.47 169.22

TVD (m RKB) 1830.60 1857.00 1883.70 1910.50 1936.40 1963.40 1990.60 2019.00 2046.60 2061.50

TVD m MSL 1803.60 1830.00 1856.70 1883.50 1909.40 1936.40 1963.60 1992.00 2019.60 2034.50

6-43

VSec (m) -387.20 -394.70 -400.20 -409.20 -417.80 -425.10 -432.60 -439.40 -443.00 -445.60

Drilling

N/-S (m) -385.90 -395.00 -403.40 -411.50 -419.00 -426.10 -432.60 -438.40 -443.00 445.20

E/-W (m) 65.10 66.60 68.20 69.80 71.30 72.60 73.70 74.70 75.40 75.80

DLS (°/30m) 0.31 0.47 0.57 0.09 0.42 0.52 0.60 0.71 0.69 0.28

COB-114

Drilling

Deviation Record: 12”1/4 section MD (m) 2173.00 2202.00 2230.00 2259.00 2286.00 2313.00 2341.00 2369.00 2398.00 2427.00 2455.00 2483.00 2509.00 2538.00 2566.00 2594.00 2622.00 2650.00 2678.00 2706.00 2734.00 2762.00 2790.00 2818.00 2846.00 2874.00 2903.00 2932.00 2961.00 2990.00 3019.00 3049.00 3078.00 3107.00 3136.00 3168.00

Incl (°) 8.05 7.13 5.36 3.81 2.87 1.64 1.35 1.57 1.63 0.90 2.16 3.77 5.05 7.52 10.20 14.35 17.74 21.38 24.88 27.93 30.57 33.13 35.64 38.43 40.77 41.26 41.73 42.37 42.82 43.36 43.96 44.37 44.72 45.01 43.72 42.03

Azim (°) 171.59 171.38 173.72 175.93 174.88 172.26 184.46 178.59 187.08 252.46 314.71 327.95 332.69 332.69 333.75 333.59 334.97 337.39 338.21 338.90 339.99 339.96 340.32 340.60 341.19 341.81 342.52 349.15 341.36 341.88 342.22 341.51 340.88 340.95 340.90 340.71

TVD (m RKB) 2092.10 2120.90 2148.70 2177.60 2204.60 2231.60 2259.60 2287.50 2316.50 2345.50 2373.50 2401.50 2427.40 2456.20 2483.90 2511.20 2538.10 2564.50 2590.00 2615.30 2639.80 2663.60 2686.70 2709.00 2730.60 2751.70 2773.40 2795.00 2816.30 2837.50 2858.50 2880.00 2900.70 2921.20 2942.00 2965.40

TVD m MSL 2065.10 2093.90 2121.70 2150.60 2177.60 2204.60 2232.60 2260.50 2289.50 2318.50 2346.50 2374.50 2400.40 2429.20 2456.90 2484.20 2511.10 2537.50 2563.00 2588.30 2612.80 2636.60 2659.70 2682.00 2703.60 2724.70 2746.40 2768.00 2789.30 2810.50 2831.50 2853.00 2873.70 2894.20 2915.00 2938.40

6-44

VSec (m) -451.10 -454.70 -460.10 -464.00 -464.90 -463.60 -467.10 -469.10 -466.50 -141.80 330.70 -397.30 -414.90 -412.20 -412.40 -406.70 -404.80 -404.00 -396.50 -387.10 -377.40 -363.80 -350.20 -355.00 -320.20 -304.40 -287.90 -277.80 -249.90 232.70 -215.20 -195.80 -177.40 -160.20 -143.60 -134.00

N/-S (m) 449.50 453.30 456.40 458.70 460.20 461.30 462.00 462.70 463.50 464.00 463.70 462.60 460.80 458.00 454.10 448.80 441.80 433.30 423.10 411.50 398.70 384.80 369.90 354.00 337.20 319.70 301.40 282.60 263.70 244.90 225.80 206.00 186.70 167.40 148.20 127.70

E/-W (m) 76.60 77.10 77.50 77.70 77.90 78.00 78.00 78.00 78.00 77.70 77.10 76.20 75.30 73.80 71.90 69.20 65.90 62.10 58.00 53.40 48.60 43.60 38.20 32.50 26.70 20.90 15.00 10.20 5.30 1.00 7.20 13.70 20.20 26.90 33.50 40.70

DLS (°/30m) 0.14 0.32 0.64 0.54 0.35 0.46 0.15 0.09 0.08 0.52 0.68 0.62 0.51 0.85 0.96 1.48 1.22 21.38 1.26 1.09 0.96 0.91 0.90 1.00 0.85 0.23 0.23 1.55 1.82 0.22 0.22 0.21 0.19 0.10 0.44 0.53

COB-114

Drilling

Deviation Record: 8”1/2 section MD (m)

Incl (°)

Azim (°)

TVD (m RKB)

3199.00 3228.00 3257.00 3274.00 3286.00

42.24 47.02 50.35 53.34 55.15

340.71 343.76 347.32 344.79 343.83

2988.50 3009.13 3028.28 3038.78 3045.79

3301.00 3316.00 3330.00 3345.00 3359.00

56.88 58.54 59.02 59.51 60.75

342.46 340.97 340.11 339.89 339.62

3054.18 3062.19 3069.45 3077.11 3084.09

3374.00 3389.00 3403.00 3420.00 3432.00

62.15 63.50 64.07 66.18 67.10

339.67 339.70 339.93 339.86 339.73

3091.25 3098.11 3104.29 3111.44 3116.20

3448.00 3462.00 3477.00 3491.00 3520.00

68.84 70.27 71.25 71.78 73.08

339.51 339.54 339.77 339.83 340.04

3122.20 3127.09 3132.03 3136.47 3145.23

3549.00 3578.00 3606.00 3636.00 3665.00

74.60 76.00 76.97 78.25 77.62

340.19 339.43 339.66 339.38 338.61

3153.30 3160.65 3167.20 3173.64 3179.70

3680.00 3694.00 3724.00 3752.00 3782.00

76.90 77.40 77.59 77.26 77.50

338.48 338.37 338.80 339.55 339.05

3183.00 3186.12 3192.61 3198.71 3205.26

3811.00 3817.00 3845.00 3874.00 3903.00

78.08 77.61 74.98 75.51 76.90

340.52 340.26 340.96 342.00 343.68

3211.40 3212.66 3219.30 3226.68 3233.60

3933.00 3940.00 3963.00

76.82 76.93 76.99

340.60 339.96 340.33

3240.42 3242.01 3247.20

TVD m MSL 2961.50 2982.13 3001.28 3011.78 3018.79 -27.00 3027.18 3035.19 3042.45 3050.11 3057.09 -27.00 3064.25 3071.11 3077.29 3084.44 3089.20 -27.00 3095.20 3100.09 3105.03 3109.47 3118.23 -27.00 3126.30 3133.65 3140.20 3146.64 3152.70 -27.00 3156.00 3159.12 3165.61 3171.71 3178.26 -27.00 3184.40 3185.66 3192.30 3199.68 3206.60 -27.00 3213.42 3215.01 3220.20

6-45

VSec (m)

N/-S (m)

E/-W (m)

DLS (°/30m)

-86.48 -66.12 -44.43 -31.13 -21.41

-109.61 -90.21 -69.12 -56.16 -46.78

-50.91 -57.10 -62.52 -65.75 -68.38

3.10 5.42 4.42 6.34 4.93

-8.99 3.69 15.66 28.56 40.69

-34.88 -22.84 -11.55 0.56 11.95

-71.99 -75.97 -79.96 -84.37 -88.57

4.14 4.17 1.88 1.05 2.70

53.87 67.21 79.77 95.19 106.21

24.31 36.82 48.61 63.09 73.43

-93.15 -97.79 -102.12 -107.42 -111.22

2.80 2.70 1.30 3.73 2.32

121.03 134.15 148.31 161.59 189.23

87.33 99.62 112.90 125.36 151.33

-116.39 -120.98 -125.90 -130.49 -139.97

3.28 3.06 2.01 1.14 1.36

217.08 245.13 272.35 301.65 329.99

177.52 203.85 229.36 256.80 283.28

-149.45 -159.13 -168.64 -178.89 -189.06

1.58 1.64 1.07 1.31 1.02

344.61 358.25 387.52 414.84 444.11

296.90 309.59 336.86 362.40 389.78

-194.41 -199.43 -210.12 -219.84 -230.19

1.46 1.10 0.46 0.86 0.54

472.45 478.32 505.52 533.56 561.70

416.38 421.91 447.56 474.15 501.06

-239.98 -241.95 -250.98 -259.89 -268.19

1.60 2.67 2.91 1.18 2.22

590.90 597.71 620.12

528.87 535.28 556.36

-277.15 -279.45 -287.06

3.00 2.71 0.48