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Case Study – Foothills Region, Canada 2008 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% Measured depth, meters 860 960 1060 1160 1260 0 2 4 6 8 10 Days from Drill-out of Previous Casing 12 2008 Results from Canadian Foothills: Circulation Improved while Drilling Ahead Measured depth, meters 100% Partial Loss Stop drilling Drilling 50% 0% 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 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. 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. 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 Pan American ENERGY Project Summary Hrs/100 Mts 20 18 15 C Dragon 12 # Hrs /100 Mts 13 11.3 C Grande 15 15 CD well # 4 CD well # 5 10 5 0 Conv WellC.Dragon CD well # 1 CD well #2 CD well # 3 Conv. CD1 CD2 CD3 19 Conv WellC.Grande Conv. CD4 CD5 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 SUCCESS IN THE ARABIAN GULF What: Where: 2nd OFFSHORE DIRECTIONAL CASING DRILLING™ from a SIDETRACK 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 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 10' Pick-Up Joint • Used 1 BHA to drill the entire hole section at 38 ft/hr 9 5/8" DLA - 3 550 # 9 5/8" Profile Nipple (CPN) • Successfully set / retrieved BHA using drill pipe (Level 3) 2.72 ' 4 1/2 XH Pin Down 4 1/2 XH Box Up • Built from 65° to 86.4°, turning the azimuth from 272° to a 292° 40.17 ' Internal Tandem Stabilizer 9 5/8" Shoe Joint 900 # 4 1/2 XH Pin Down • Unstable shale, pack-off csg near TD in the top of the reservoir 4 1/2 XH Box up Crossover TESCO 4 1/2 IF Pin Down CRIMP ON 4 1/2 IF Box up 300 # STABILISER • BHA, tripped thru casing to surface, leaving shale behind casing Mud Motor 3000 # Directional Reaming Shoe 5 1/2" FH Box Down 4 1/2 REG Pin Up Crossover 5.92 ' 300 # 4 1/2 REG Box Down 4 1/2 REG Pin Up Highlights: Underreamer 860 # 4 1/2 REG Box Down 4 1/2 REG Pin Up • No QHSE incident occurred during the Job • No rig modifications were required Crossover 325 # 4 1/2 IF Pin Down 4 1/2 IF Box Up Redback Roller Reamer 700 # 4 1/2 IF Pin Down 4 1/2 IF Box Up Stickout 80.70 ' Crossover 325 # 5 1/2" FH Pin Down 5 1/2" FH Box Up • Tesco’s CDE™ torque modeling proved reliable Filter Sub 400 # 4 1/2 IF Pin Down 4 1/2 IF Box Up Slimpulse MWD • No loss circulation, Torque and Drag trended well 3100 # 4 1/2 IF Pin Down 4 1/2 IF Box Up • Achieved desired directional trajectory Xceed675 RSS 3000 # • Provided cased wellbore into reservoir. 74.78 ' 4 1/2 Reg Box Down 4 1/2 Reg Pin Up 8 1/2" PDC Bit 100 #