Application of a Point the Bit Rotary Steerable System in Directional Drilling Prototype Well-bore Profiles

摘要

Recent trends in the oil industry are requiring higher degrees of accuracy in the placement of boreholes, while improving overall rates of penetration. In addition to reducing overallrndrilling costs, several technical reasons can be cited. These include: Increasingly complex directional well trajectories designed to drain more of the reservoir; accurate build ratesrnand precise landing of horizontal wells; accurate horizontal control for steering relative to an interface or to reduce undulation in extended reach wells. Rotary steerable systems have been introduced in the past few years to respond to these more complex requirements. These systems have shown the potential for reducing the costs of drilling while providing improved directional control.rnElimination of sliding increases rates of penetration, provides better hole cleaning, smoother boreholes, less chance of differential sticking; and the ability to drill further. Schlumberger has developed a new rotary steerable system, which functions on a point-the-bit principle. The system has no non-rotating or stationary parts in contact with the formation. The system is implemented in a 6 ?-inch platform and operates in bore-hole diameters between 8 3/8-inch and 9 7/8-inch.rnThis paper will present an overview of the new point-thebit system. Benefits of the system will be discussed. Case studies from two wells will be presented. The presentation will discuss the well objectives, the plan implementation, and include operational highlights and issues. Project results and improvements in implementation will be presented with discussion on how the system was utilized to insure valueadded savings.