莫116井区水平井钻井设计优化与应用

莫116井区在水平井钻井施工过程中,面临着“缩、卡、塌、漏、喷、硬”等难题,为避免井下复杂事故、缩减钻井周期、降低作业风险,在该区开展了水平井优化设计与轨迹优化控制技术研究工作。通过井区已钻井资料论证分析,针对性地对井身结构和井眼轨迹控制提出了优化方案；根据前期实钻情况和钻柱力学分析,优化了水平井钻井钻具组合和钻井参数；通过优化泥浆体系,解决定向作业井段了井壁稳定性差、定向施工摩阻大、粘附卡钻几率高等问题。通过对上述研究成果的现场应用,实现了水平井优快钻井目标,二开定向段和三开井段平均机械钻速相比优化前水平分别提高27%、30%,其中M614等井实现了“一趟钻”完成了水平段钻进目标。

Design Optimization of Horizontal Well Drilling and the Application in Mo116 Well Area

In the horizontal well drilling construction in Mo116 well area, which is located in the south of Mobei oilfield, there are the challenges of undergauge, drilling tool jamming, borehole collapse, mud loss, blowout and hard rocks. The optimization of horizontal well design and technical study on drilling trajectory control are carried out in this area to avoid complex downhole accidents, shorten drilling cycle and reduce operating risk. According to the analysis on drilling data of this area, the optimization schemes of wellbore structure and well trajectory control are put forward; based on the analysis on previous drilling data and drill string mechanics, the horizontal drilling BHA and drilling parameters are optimized; through the drilling fluid system optimization, the poor borehole wall stability, high friction and sticking probability in directional drilling sections are improved. By the application results, optimal and fast drilling in horizontal wells is realized, the average ROP of the second directional interval and the third interval are increased by 27% and 30% respectively than those before optimization, and one trip is realized in M614 and other wells for horizontal sections drilling.