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A major operator working in the Middle East was experiencing well loss challenges when drilling through a difficult interbedded section. The 16-in. section, which comprised limestone, sandstone, and shale formations, was extremely hard and abrasive. To minimize the risk of losses, high-weight mud was used, but this significantly reduced ROP and the operator needed to use two tungsten carbide insert (TCI) roller cone bits to complete the section. The operator had then tried to improve ROP through the section by using PDC bits, but without success. Concerned about this drilling cost and, believing it was possible to drill the entire 2,721 ft (829 m) section, shoe-to-shoe, in one run, the operator asked Baker Hughes, a GE company (BHGE), for a solution.

BHGE recommended the Kymera™ XTreme (XT) hybrid drill bit for the application. Building upon the success of prior hybrid technology, the Kymera XT bit can be customized for each scenario and delivers smooth, reliable, faster, and more durable drilling performance in both vertical and curve applications. It also delivers superior tool-face control in difficult drilling environments including challenging carbonates and interbedded formations where drilling speed and durability are often pushed to their limits.

Download the PDF to read the full case study.

Challenges & Results


  • Increase ROP despite high weight mud
  • Drill 16-in. vertical section in one run through hard, abrasive formations
  • Reduce costs-per-foot through 2,721 ft (829 m) section


  • Saved 2.3 days
  • Increased average ROP 138%
  • Reduced cost-per-foot 50%
  • Drilled 16-in. vertical section in one run