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The XCD bit is specially designed for drilling vertical or tangential wells to TD in one run. This PDC bit drills on standard casing that is rotated at the surface. The sub of the XCD bit is composed of durable oilfield-grade steel, and its body is bronze. This unique composition enables it to be drilled out by any standard PDC bit after the XCD casing bit has drilled to TD and the casing has been cemented. After drillout, the drillout PDC bit can continue drilling the next interval, eliminating the need for a dedicated drillout run.
Torque rings to fit 16¾- × 22-in casing were produced from customer-provided casing joints in a local Schlumberger facility for Russia and Caspian Sea operations. A third-party expert supervised manufacturing.
Nearly 200 uncommon torque rings were manufactured and delivered a week before drilling began. Gazpromneft-Zapolyarye and Schlumberger conducted this first-time CWD operation with the 16¾-in bit in permafrost to drill a total of 524 m from surface to TD within 60 h. Casing while drilling saved at least several days from the well construction process by eliminating additional wipe trips and a dedicated casing run, minimizing time exposure in the permafrost.
— Drilling Manager, Gazpromneft-Zapolyarye
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