丛式井侧钻绕障水平井优化设计方法

发布时间：2018-12-26 15:33

【摘要】：针对丛式井侧钻水平井设计过程中需要避开已钻障碍井的问题,分别根据障碍井段为直井段和定向井段,将障碍物抽象为圆柱和圆环模型,运用矢量代数给出了障碍物轴线方程,并根据侧钻点方向线、靶点方向线与障碍物是否相交,确定绕障井的剖面类型。以绕障轨道总长度最短为优化目标,以绕障轨道距障碍物的最近距离、最大井斜变化率、最大方位变化率以及最大井眼曲率为约束条件,建立了丛式井侧钻绕障水平井轨道最优化设计模型。根据不同的绕障类型进行了实例计算,结果表明所提出的最优化模型能够得到井眼轨道总长度最短的轨道,并满足安全绕障距离及井斜变化率、方位变化率、井眼曲率的要求。该方法避免了复杂的试算和校核,并且适用于其他类型绕障井的轨道设计。
[Abstract]:In view of the need to avoid the obstructed wells in the design process of sidetracking horizontal wells in cluster wells, the obstacles are abstracted into cylindrical and circular models according to the vertical and directional sections of the obstructed wells, respectively. The equation of obstacle axis is given by using vector algebra. According to the direction of sidetracking point, whether the target direction intersects with obstacle, the profile type of obstacle is determined. The shortest total length of the obstacle track is taken as the optimization objective, and the nearest distance from the obstacle track, the maximum well deviation rate, the maximum azimuth change rate and the maximum borehole curvature are taken as the constraint conditions. The optimum design model of sidetracking barrier horizontal well track in cluster well is established. The results show that the proposed optimization model can obtain the shortest trajectory with the shortest overall length of the borehole track, and meet the requirements of safety around the barrier distance, well deviation change rate, azimuth change rate and borehole curvature. This method avoids complicated trial calculation and check, and is suitable for other types of track design.
【作者单位】：中国石油大学石油工程教育部重点实验室;
【基金】：国家自然科学基金创新研究群体项目“复杂油气井钻井与完井基础研究”(编号:51521063) 国家重点研发计划课题“钻井工艺及井筒工作液关键技术研究”(编号:2016YFC0303303) 国家重大科技专项(编号:2017ZX05009-003)
【分类号】：TE243

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