Schlumberger

Case Study: Drilling System Delivers One-Trip Openhole Sidetrack and 75° Curve in Oklahoma’s Colony Wash Formation

Drilling 605-ft section with high-build rate saves 24 hours of rig time

Challenge: Perform an openhole sidetrack below the casing shoe at 12,520 ft, and directionally drill a 600-ft, 61⁄8-in section with high DLS through the Colony Wash formation in one trip.

Solution: Use an integrated drilling system: 61⁄8-in Kinetic diamond-impregnated bit, Neyrfor Delta high-performance directional turbodrill, Trackmaster OH openhole whipstock and sidetracking system with MWD services.

Result: After setting the whipstock at 12,520 ft (top), 31 ft below the casing shoe, a 605-ft, 61⁄8-in section was drilled at 7.2 ft/h with a maximum DLS of 22.69°/100 ft and a 75° inclination, saving 24 hours of rig time.

Multichallenge application requires four advanced technologies

An operator working in Beckham County, Oklahoma, required a lateral to be drilled from the pilot hole. To complete the planned 6 1⁄8-in section, an openhole sidetrack would have to be performed 31 feet below the casing shoe at 12,520 ft to provide a kickoff point from the pilot hole. From this point, the operator wanted to drill a 6 1⁄8-in section of at least 600 ft with high DLS through the Colony Wash formation in one trip. To provide the operator with an openhole sidetrack and the capability to subsequently drill the planned section in one trip, an integrated system was assembled: 6 1⁄8-in Kinetic diamond-impregnated bit, Neyrfor Delta high-performance directional turbodrill, Trackmaster OH openhole whipstock and sidetracking system with MWD services.

Integrated drilling system produces efficient results

The whipstock set at 12,520 ft (top), 31 ft below the casing shoe, and time drilling off the whipstock face was smooth and completed without delays. Although maximum DLS was higher than expected, the 22.69°/100 ft, the 605-ft, 61⁄8-in section was drilled at a rate of 7.2 ft/h (68.1% sliding, 31.9% rotating). The integrated system’s smooth departure and curve resulted in less torque and drag, thereby improving lateral drilling performance. The openhole sidetrack enabled the operator to directionally drill ahead in one trip, eliminating the need for a dedicated trip to set the whipstock and saved an estimated 24 hours of rig time


Download: Drilling System Delivers One-Trip Openhole Sidetrack and 75° Curve in Oklahoma’s Colony Wash Formation (0.53 MB PDF)

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Integrated System Delivers
One-Trip Openhole Sidetrack

Kinetic drill bit attached directly to the Trackmaster OH whipstock, powered with a Neyrfor Delta turbodrill.
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