用旋转导向钻井系统钻大位移井

PETROLEUM ENGINEERING DRILLING EXTENDED REACH WELL WITH ROTARY STEERING DRILLING SYSTEM

在用滑动导向系统钻大位移井时，随着位移及井深的不断增大，由于上部钻柱不旋转，会引起摩阻和扭矩过大、方位漂移失控、井眼清洗不良等问题。计算和实践表明，用滑动导向系统进行钻井时，大位移井的极限延伸能力受到了限制。文中对用旋转导向系统钻大位移井进行了方案性研究，设计了相应的可遥控和井下自动控制的旋转导向工具ＲＳＤＳ，并对旋转导向的机理进行了理论研究。所设计的旋转导向工具以钻井液为动力，充分利用了钻井液的冷却作用，具有较好的工作可靠性，结构简单。用旋转导向系统ＲＳＤＳ进行大位移井钻井，可望相当准确的控制井眼轨迹，大幅度减少钻柱所受的摩阻和扭矩，显著改善井眼的清洁状况。

The torque and drag of the drillstring in extended reach well will increase extr emely with the increase of the depth and displacement when the top string does n ot rotate during sliding steering drilling operation. The hole cleaning will als o be impaired and the hole direction control will be very difficult. The future application of ERD will be challenged by these problems. It is recognized that t he extreme extension of the extended reach well is limited when sliding steering system is applied. A schematic research using rotary steering tool to drill ERD has been done in this paper. RSDS (Rotary Steering Drilling System), a rotary s teering tool, that can be telecontrolled and controlled automatically in the dow nhole, the working mechanism and design were studied theoretically. The rotary s teering tool studied in this paper is powered and cooled by drilling fluid, it’ s reliable and has simple structure. RSDS will control well path accurately, red uce torque and drag remarkably and improve hole cleaning condition obviously. Th e drilling practices of ERD will be more reliable if RSDS is used.