用几何法随钻修正设计的水平井轨道

Modifying of Trajectory of Horizontal Well While Drilling

在双增型井身剖面设计施工中，针对水平井靶点不确定及实钻轨迹偏离设计而影响钻点准确进入靶区问题，提出在稳斜段用几何法随钻修正原设计轨道的方法。该力法将新靶点的坐标、正钻点的坐标及井斜角等作为已知参数，根据推导得出的计算公式求解续钻稳斜段段长、造斜段弧长及造斜率，并给出了按几何方法修正设计轨道的简便作图法；编制了随钻修正设计轨道的相应程序，并进行了实例计算。

A geometric method is proposed,by which the path of a horizontal well is corrected while drilling,for solving the problems of missing the target area in designing and/or deviating from planned trajectory in drilling at the steady inclined section.When coordinates of a new target and a drilling position as well as deviation angles have been known,the corrected trajectory can be drawn directly with geometry relation.The formulae of calculating lengthes of steady inclined and deflected sections and the hole curvature have been derived.A program and a case are given.