中文摘要：

针对目前连续管侧钻开窗工艺存在的动力钻具容易反转、切削动力不足等主要问题,提出了一种承扭式连续管开窗钻具组合,并介绍了其工作原理,建立了纵横弯曲力学模型,进行了侧钻窗口形状设计和铣鞋力学特性分析,讨论了钻压、动力钻具长度、柔性短节长度和抗弯刚度等参数对磨铣过程中侧向力、转角的影响。计算结果表明：侧向力随铣鞋偏心位移增加呈线性增大,在骑套段侧向力和转角不发生变化;侧向力随钻压升高由降斜力变为增斜力,随动力钻具长度增加先减小后增大,随柔性短节长度增加由增斜力变为降斜力,随柔性短节抗弯刚度增加而减小;铣鞋转角受钻具组合参数的影响小。研究结果表明：通过改变钻压、钻具组合尺寸参数可以调节开窗钻具组合的力学性能,控制磨铣过程中铣鞋的侧向力,这对现场钻井作业具有一定的指导意义。

英文摘要：

Currently, CT sidetracking processes frequently suffer from reverse rotation of power tools, insufficiency in cutting powers and other key issues. Accordingly, it was proposed to mill BHA for windo wing of CT sidetracking operations. In addition to highlighting the working principles of the BHA, me chanical models for vertical and vertical deformations have been constructed. Configurations of sidetracking windows have been designed and mechanical properties of milling shoes have been analyzed. Furthermore, impacts of drilling pressures, lengths of power tools, lengths and rigidity of flexible nipples and other fac tors on mechanical behaviors have been reviewed. Calculation results showed that lateral forces might linv arly increase with increases in the eccentric displacement of milling, while no change could be observed in lateral force and rotation angle during milling along the vertical line of the deflecting surface. Lateral force increased from drop tendency to buildup tendency with increases in WOBs, whereas lateral forces de- creased to minimum and then increased with increases in lengths of downhole motors. At the same time, lateral force decreased from buildup tendency to drop tendency with increase of length of flexible nipples. Lateral force increased with the decrease of bending rigidity of flexible nipples. The variations had no ma jor impact on rotation angles. Research results showed mechanical properties of milling BHA deployed for sidetracking operations could be effectively regulated by adjusting drilling pressures, sizes of milling BHA and other parameters. In this way, rhw lateral forces of milling could be managed efficiently. Relevant re search conclusions may provide necessary guidance for drilling operations on site.