基于随钻环空压力测量的侧钻水平井滑动导向技术优化方法

Optimization method of slide steering technology for sidetrack horizontal well based on annular pressure measurement while drilling.

滑动导向钻井技术是侧钻水平井主要的井眼轨迹控制方法。由于侧钻水平井受靶前位移小和环空间隙小的制约,降低了滑动导向过程中井眼净化效果,影响了侧钻水平井滑动导向效率。通过分析侧钻水平井滑动导向效率的影响因素,阐述了一种基于随钻环空压力测量(PWD)的侧钻水平井滑动导向技术优化方法,即取接单根工况为研究对象,将接单根时的当量钻井液密度(EMW)按照时间绘制当量钻井液密度剖面图,定义关泵最大和最小压力时间窗口以及平均压力时间窗口,比较窗口内压力大小的变化趋势、评价井眼净化效果,提高了井眼净化监测的时效性,优化了滑动导向技术,同时也扩展了PWD工具在定向井技术方面的应用。

Slide steering drilling technology is the main control method for wellbore trajectory of sidetrack horizontal wells.Since sidetrack horizontal wells are constrained by the small displacement in front of the target and small annular clearance,the hole cleaning efficiency is reduced in process of the slide steering.By analyzing the influence factors of slide steering efficiency of sidetrack horizontal wells,the paper elaborated a method which optimized the slide steering technology of sidetrack horizontal wells based on annular pressure measurement while drilling,that is to take working condition of connecting single pipes as the target of the study,a density profile of equivalent drilling fluid against time was plotted at the equivalent drilling fluid density of connecting single pipes,the time window was defined between the maximum and minimum shut-off pump pressure and the time window of mean pressure,the trend was compared for the pressure changes in the window,the hole cleaning effects were evaluated,the monitoring effects were improved for hole cleaning,the slide steering technology was optimized,the application of annular pressure measurement while drilling to directional drilling technology was extended.