连续管双圆弧定向待钻轨道设计

Design of Dual-arc Hole Trajectory in Coiled Tubing Directional Drilling

连续管钻井过程中实钻工具面调整到设计工具面的概率很小,实际定向角度与设计值之间的偏差影响了井眼轨道符合率,严重时会导致定向失败。鉴于此,提出了一种连续管双圆弧定向待钻轨道设计方法,根据实际施工中连续管工具面角调整方式,将工具面角调整约束方程代入整个轨道设计过程中考虑,通过数值计算方法得到轨道设计参数,设计结果既能满足定向设计要求,又避免了定向角度偏差,可提高连续管定向钻井轨迹的控制效率,降低作业风险。设计方法已开发成计算机软件,便于现场应用。

During coiled tubing drilling operations,it is hardly possible to adjust actual tool face to designed tool face. The deviation between actual directional angle and the designed value may negatively affect conformity of well trajectory,or even lead to orientation failure in extreme cases. Accordingly,a design of dual-arc well trajectory in coiled tubing directional drilling is proposed. Considering the way to adjust tool face of coiled tubing during actual drilling,constraint equation for such adjustment is substituted in the overall trajectory design. In this way,trajectory design parameters can be obtained through numerical calculation. In addition to satisfying requirements for design of directional drilling and eliminating deviation in orientation,the design may enhance control efficiency over directional drilling trajectory by using coiled tubing and minimize operational risks. The newly developed design method has been programmed into computer software to facilitate on-site application.