Challenge: Extend run life and reduce number of trips to reach TD in hot gas wells
Solution:
Results:
Schlumberger was working with Encana to drill directional wells from pads in an unconventional gas play in the Horn River basin of British Columbia, Canada. Temperatures that sometimes exceeded 150 degC [302 degF] limited the run life of the downhole equipment. To extend run life and reduce the number of trips needed to reach TD, Encana and Schlumberger jointly designed a drilling system engineered to deliver maximum performance.
The BHA included a 7-in-OD PowerPak HR hard rubber motor lined with Dyna-Drill NBR-HR elastomer that powered a SHARC drill bit, the TeleScope service, directional drilling services, and the Slider system.
The PowerPak HR motor drilled 4,650 m of the 8¾-in hole in the first well and 5,258 m in the second well in one run. The BHA with the SHARC PDC bit and PowerPak HR motor began drilling at 754-m MD, drilled the build section to land the well, and continued drilling in the lateral section.
After staying in the hole for 255 circulating hours and spending 170 hours drilling at an average ROP of 27.3 m/h, the BHA was pulled out of the hole for a pipe swap.
In a subsequent well, a PowerPak HR motor and SHARC bit drilled 5,258 m of the 8¾-in hole at an average ROP of 25.9 m/h, setting another worldwide run length record for 8¾-in hole size and a North America record for all hole sizes. The run totaled 203 drilling hours and 303 circulating hours at temperatures exceeding 150 degC.
The motor-elastomer configuration increased individual run length and reduced the number of trips, saving time and money for Encana. The performance improvement was the result of a team-based collaborative effort between Encana and Schlumberger teams at all levels to continue to redefine the technical limits and drill Horn River basin hot wells more efficiently, from spud to TD.
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