Discussion on the Design of Well Trajectories in Deepwater Relief Wells
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摘要: 国内深水救援井井眼轨道设计既无标准可供参考，也无实际设计经验可供借鉴，为此，从救援井实施限定条件着手，制定了深水救援井井口位置选择图版和连通点（目标点）位置选择原则，对“J”形、平行接近连通形、直接连通形以及穿越（pass-by）形等4种救援井常用井眼轨道进行了对比分析，认为穿越（pass-by）形轨道在扩大探测范围和提高定位精度方面有很大的优势，因而将其作为深水救援井井眼轨道的首先，并将其划分为接近、测距定位、追踪跟随和连通4个阶段，研究了各阶段的切入角、井间距等关键设计要素，确定救援井井眼轨道最大井斜角小于60°，狗腿度不超过3°/30m，形成了深水救援井井眼轨道设计基本方法，并利用该方法对中国海油海外区块一口深水救援井的井眼轨道进行了设计。研究结果表明，研究形成的深水救援井井眼轨道设计基本方法可为国内深水救援井井眼轨道设计提供指导。Abstract: Because there is no standard or actual design experience to serve as a reference in well trajectory design for deepwater relief wells in China,work was done to develop selection charts that would connect points(targets)in accordance with principless for deepwater relief well locations.They were developedin a way to respect the restricted conditions in drilling relief wells,they were individually evaluated for each of the four kinds of common relief well trajectories:"J" shape,parallel close connected shape,directly connected,and "pass-by" shapes.Research results showed that the well trajectory with "pass-by" shape had a great advantage in improving the measurement range and position accuracy.Consequently,it has been determined to be the preferred well trajectory for deepwater relief wells,and divided into four stages,i.e.approaching,positioning,tracking and intercepting.The key design factors as the entrance angles at all stages and well spacing,etc.,have been studied,and it was determined that when the maximum inclination angle of the relief well is less than 60°,the dogleg should be not greater than 3°/30m,which determines the basic design method of well trajectory in deepwater relief wells.The method has been used for designing well trajectories in a deepwater relief wells in the CNOOC overseas block.Research results showed the newly-developed method could provide valuable guidance for designing well trajectories in deepwater relief wells in China.
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Key words:
- deepwater drilling /
- relief well /
- well trajectory
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