关键词: 导向螺杆钻具, 可调弯壳体, 可换稳定器

Abstract: Like conventional steerable screw drill, steerable screw drill with adjustable bent shell and exchangeable stabilizer is also used in drilling operation for directional wells, horizontal wells and fishbone laterals. Different from conventional steerable screw drill, the bent angle of the bent shell of universal coupling can be freely adjusted without dismantling the drill tool. The bent angle is usually adjusted within a scope of 0-3°. The near-bit stabilizer can be freely replaced without dismantling the drill tool. The size of stabilizer is usually 3.175-12.7mm less than the size of hole. The structural and engineering parameters of steerable screw drill can be adjusted in real time on the drilling operational site according to the concrete working conditions, thus improving the flexibility of service tool and controllability of operational process. This help improve drilling engineering quality and lower drilling cost. This article also proposes to continue optimization design in order to solve the problems related to the existing adjustable bent shell and on-site change of replaceable stabilizer.

Key words: steerable screw drill; adjustable bent shell; replaceable stabilizer