Directional drilling is the science of deviating a wellbore along a planned path to a target located a given lateral distance and direction from vertical. This includes drilling as vertically as possible from a given TVD. Schlumberger combines proven workflows and technologies to place a large quantity of quality data in the hands of expert directional drillers. The data enable them to make time-critical decisions for efficient, accurate drilling of extended-reach, horizontal, vertical, and complex directional wells and sidetracks. Our experienced directional drillers and proven technologies provide the trajectory control needed to drill the well correctly, the high-quality hole required for successfully running and cementing casing, and precise placement of the wellbore in the reservoir to optimize production and maximize recovery and ROI. Our directional drilling technologies increase ROP and minimize flat time. PowerDrive rotary steerable systems and PowerPak steerable motors enable precise directional control. Scope and VISION advanced LWD and MWD services acquire real-time measurements for geosteering and formation evaluation. High-speed telemetry transmits data and downlinks commands. Operation Support Centers provide a collaborative environment where highly trained experts focus on optimizing drilling performance while ensuring that well objectives are met. These Centers supply real-time expertise for remote monitoring, modeling, and controlling geomechanics surveillance, drilling optimization, and formation evaluation.