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Results n Saved more than 6 days rig time and estimated USD 400,000 in drilling costs n Improved ROP by an average 127% n Eliminated sliding intervals and associated invisible lost time spent tripping pipe for BHA change n Minimized wellbore tortuosity for improved hole quality in the curve interval Challenges n Planned 12°/100-ft DLS in curved section n 8¾-in. curved and lateral section n 2D wellbore profile n OBM 11- to 11.2-lbm/gal n Improve ROP as compared to conventional performance in offset wells Baker Hughes solution n Deployed 6¾-in. AutoTrak Curve RSS for precise directional control and well placement n Used three 8¾-in. Baker Hughes drill bits with 3-in. gauge length n Achieved 14.62°/100-ft BUR with 29.1 ft/hr average ROP n Drilled the 1,900 ft vertical/nudge section with an average ROP of 40 ft/hr AutoTrak Curve RSS Saves More Than 6 Days Rig Time and USD 400,000 Location: Oklahoma, SCOOP Area An operator drilling with conventional, mud- motor BHAs in the Oklahoma’s South Central Oklahoma Oil Province (SCOOP) area contacted Baker Hughes to improve drilling performance in a planned target well. The key performance objectives set by the operator’s drilling team included achieving a dogleg severity (DLS) of 12°/100-ft, and an improvement in the rate of penetration (ROP) as compared to recently drilled offset wells. The conventional drilling process required alternating between sliding and rotating modes to determine tool-face orientation, which incurred invisible nonproductive time (NPT). Baker Hughes recommended deployment of the AutoTrak ™ Curve rotary steerable system with an 8¾-in. Baker Hughes drill bit. The AutoTrak RSS eliminated slide and enabled precise directional control from the surface for exact wellbore placement and faster drilling. The AutoTrak Curve RSS downlinks on bottom, to efficiently drill ahead and stay on course without interrupting the drilling process. The system enabled drilling out the 9 5 / 8-in. service casing, to subsequently drill the 1,900-ft (579-m) vertical/nudge section in one run, averaging 40 ft/hr ROP. After drilling the interval, the AutoTrak Curve RSS was able to kick off in the correct direction, building up to the required DLS with a 14.62°/100-ft BUR. The system maintained an average ROP of 29 ft/hr in the target well, achieving a 127% improvement when compared to the 12.8 ft/hr average ROP of the offset wells. More than 6 days of rig time and two bit trips were eliminated for an estimated savings of USD 400,000. Depth Versus Total Days Saved 6.2 days with first AutoTrak Curve RSS deployment Saved two bit trips Offset Well - Conventional BHA Target Well - AutoTrak Curve RSS Total Days Measured Depth (ft) 12000 12500 13000 13500 14000 14500 15000 15500 16000 0 8 4 12 2 10 6 14 16 CASE HISTORY | bakerhughes.com
