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Case Study – Foothills Region, Canada 2008 CASING DRILLING TM Plastering Success

860. 960. 1060. Measured depth, meters. 1160. 1260. 8. Days from Drill-out of Previous Casing. 4. 6. 12. 0. 10. 2. Case Study – Foothills Region, Canada 2008 CASING DRILLING TM Plastering Success. 9-5/8” casing x 12-1/4” EZCase drilled from 850 M to 1,250 M

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Case Study – Foothills Region, Canada 2008 CASING DRILLING TM Plastering Success

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  1. 860 960 1060 Measured depth, meters 1160 1260 8 Days from Drill-out of Previous Casing 4 6 12 0 10 2 Case Study – Foothills Region, Canada2008 CASING DRILLINGTM Plastering Success • 9-5/8” casing x 12-1/4” EZCase drilled from 850 M to 1,250 M • CD effectively reduced lost circulation while drilling • NPT reduction > 50%

  2. 100% 50% 0% 2008 Results from Canadian Foothills: Circulation Improved while Drilling Ahead Stop drilling Drilling Partial Loss Measured depth, meters

  3. Artic Permafrost Application Mackenzie Delta –Canada • Conventional Drilling Issues • Keeping Permafrost frozen is critical to • wellbore stability. • Hydrates and borehole erosion. • Mud cooling is required. • Conventional drilling requires high flow • rates for hole cleaning. • Lots of problems with high flow rate • coolers. • Difficult to keep hole stabile while tripping • to run casing. • Small pumps dictated by ice road limits. SPE paper 111806

  4. Artic Permafrost Application Mackenzie Delta –Canada • Casing Drilling Solution • Drilling with casing: • eliminated need to trip. • allowed good cleaning at low flow rates. • minimized pressure losses (heating). • implemented with small pumps • BHA: 17-1/2 EZCase bit, stab, float collar, joint of • casing, float collar, stab, 4 jts casing, stab, csg • Mud cooling. • KCl polymer mud (8-10% KCl depresses • freezing) • Spiral heat exchanger, ammonia • refrigerant, glycol heat exchanger fluid • Spiral exchanger minimized plugging • but gave adequate contact surface and • time.

  5. Conclusions/Observations • Minimized flat time. • No borehole stability issues. • Cooling system & CD prevented • permafrost from degrading. • Extended casing setting depth • well below base of permafrost. • Kept ROP below 15m/hr to • minimize need to stop drilling • and circulate for hydraulic lift. • Walnut hull sweeps used to • control balling. • EZCase drilled out with TCI bit.

  6. CASING DRILLING® Project Summary Pan American ENERGY, Argentina • PAE received approval from government to extend its Cerro Dragon concession (4000 Km2) to 2017. They will drill approximately 300 wells /year. • At least 10% of these well will benefit from CwD, due to problems associated to Water Injection/ depletion problems (High Losses). • CwD project initiated as Enhanced Productivity Project (rather than Drilling) • A typical well is cased with 9 5/8” @ 300m & 5 ½” @ 2,400m. • Tesco® Project: Evaluate a 5 well Project with 5½” BRT® OBJECTIVE: To be able to drill the production hole with minimum NPT associated to losses, trips, allowing a positive impact on the productivity of the well

  7. Pan American ENERGY Project Summary C Dragon C Grande Conv. CD4 CD5 Conv. CD1 CD2 CD3 • Successfully drilled both areas: Averaged 14 days/well. • Reduce NPT related to loss circulation and highly damaged reservoirs. • Reduced production hole from 13 to 11 days. • Good quality wells: Better CBL’s and one well did not require fracturing. • C Grande previously considered not accessible. • Value: Less Completion Costs & possibly better productivity . • CURRENT CUSTOMER STATUS: PAE Evaluating production results. PAE requesting fiscal leverage from government related to technology deployment, in order to start back in Jan 09

  8. SUCCESS IN THE ARABIAN GULF What: 2nd OFFSHORE DIRECTIONAL CASING DRILLING™ from a SIDETRACKWhere: QATAR – MIDDLE EAST Challenge: • Lost 2 BHA’s drilling conventionally • thru the unstable shale formation. Objective: • Drill a directional section through unstable • shale formation with 9 5/8” casing. Results: • Used CDS™ to make up and run 9 5/8” • casing, then drilled with the casing • CASING DRILLING™ successfully drilled the • 12 ¼” hole section into the reservoir Job Details: • Casing Size: 9-5/8 - 47Lbs/ft, L80, BTC c/w MLT™ Rings • CASING DRILLING™ footage drilled 1,416 ft • Job Date: September, 2008

  9. SUCCESS IN THE ARABIAN GULF RSS CD-BHA Operations: • BHA: PDC Bit/Rotary Steerable/MWD/RR/UR/Motor/DLA • No issues tripping / drilling casing thru openhole sidetrack • Used 1 BHA to drill the entire hole section at 38 ft/hr • Successfully set / retrieved BHA using drill pipe (Level 3) • Built from 65° to 86.4°, turning the azimuth from 272° to a 292° • Unstable shale, pack-off csg near TD in the top of the reservoir • BHA, tripped thru casing to surface, leaving shale behind casing Highlights: • No QHSE incident occurred during the Job • No rig modifications were required • Tesco’s CDE™ torque modeling proved reliable • No loss circulation, Torque and Drag trended well • Achieved desired directional trajectory • Provided cased wellbore into reservoir.

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