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The 12¼-in. tangent interval in the Green Canyon field in the Gulf of Mexico is notorious for drilling dysfunctions caused by interbedded shale and sand formations throughout the 4,500 ft (1372 m) section. In addition to the potential damage and nonproductive time (NPT) caused by stick-slip, operators in this field typically incur further inefficiencies due to sub-optimal bit-reamer matching through varying lithology as well as when they are forced to trip out of the hole to make a dedicated rathole reaming trip. To reduce NPT in this interval, Baker Hughes, a GE Company (BHGE), proposed a unique bottomhole assembly (BHA) solution, including a TerrAdapt™ adaptive drill bit, a GaugePro™ ECHO digital reamer for rathole elimination, and GaugePro™ XPR as the main reamer with the string powered by an AutoTrak™ rotary steerable system (RSS). TerrAdapt Adaptive Drill Bit Case Study - Offshore GoM.pdf