井下闭环可变径稳定器的工作原理及应用研究

MECHANISM OF CONTROLLING BOREHOLE TRAJECTORY WITH CLOSE-LOOP ADJUSTABLE STABILIZER AT DOWNHOLE

井眼轨迹井下闭环控制技术是当前国内外石油钻井的前沿技术 ,将该技术与随钻测井技术结合 ,能实现地质导向技术。钻成大位移井必须依靠井眼轨迹控制技术 ,研制的井下闭环可变径稳定器是实现该项技术的关键。本文着重论述了井下闭环可变径稳定器的结构、工作原理及其控制井眼轨迹的方法。井下闭环可变径稳定器的研制及现场的初步试验成功 ,为解决我国大位移井问题 ,特别是为滩海油气勘探、提高钻井机械钻速、降低钻井成本提供了一条有效的途径。

The closed_loop control of the well trajectory at downhole is the most advanced technology in domestic and overseas' drilling engineering.The technology of extended_reach well has become a main focus in the drilling technology of the petroleum industry in the world.It is necessary to depend on the control technology of borehole trajectory to drill the extended_reach well successfully.A closed_loop adjustable stabilizer at downhole is developed.The structure and principle of operation of the stabilizer,and method for controlling borehole trajectory with the close_loop adjustable stabilizer at downhole are described in detail.The close_loop adjustable stabilizer at downhole has been used in oilfield.It may provide an effective way for drilling of the extended_reach well,especially for the offshore_drilling,enhancing the rate of penetration and reducing the drilling cost.