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Directional deflection equations for steerable drilling tools and the control mechanism of wellbore trajectory

机译：导向钻井工具的定向挠度方程及井眼轨迹控制机制

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AbstractTo meet the wellbore trajectory control requirements for all kinds of steering drilling modes, the directional deflection equations for steerable drilling tools and the process control method for wellbore trajectory were proposed and an application example was given. By proving that the orientation direction of steerable drilling tool was consistent with the principal normal direction of borehole trajectory, directional deflection equations for steerable drilling tools were established. By establishing the relation curves between the build-up rate and tool face angle, and the relationship between built-up rate and orientation azimuth angle of steerable drilling tool, a process control technique for wellbore trajectory was presented. The research shows that the build-up rate of steerable drilling tool determines the curvature of wellbore trajectory, the orientation direction of steerable drilling tool determines the principal normal direction of wellbore trajectory; the orientation azimuth angle and the tool face angle both have the orientation function, and they can calculate and complement each other. These research results reveal the interaction mechanism and control mechanism between steerable drilling tools and wellbore trajectory, so the control scheme of wellbore trajectory can be formed based on the planned wellbore trajectory, and operating characteristics of steerable drilling tool can be controlled and monitored while drilling.
机译：摘要为满足各种转向钻井方式的井眼轨迹控制要求，提出了导向钻井工具的定向挠度方程和井眼轨迹的过程控制方法，并给出了应用实例。通过证明定向钻具的定向方向与井眼轨迹的主要法线方向一致，建立了定向钻具的定向挠度方程。通过建立增高率与工具面角之间的关系曲线，以及增高率与定向钻井工具的方位角之间的关系曲线，提出了井眼轨迹的过程控制技术。研究表明，导向钻具的成藏率决定了井眼轨迹的曲率，导向钻具的方向决定了井眼轨迹的主要法线方向。定向方位角和工具端面角均具有定向功能，可以相互计算和互补。这些研究结果揭示了可控钻井工具与井眼轨迹之间的相互作用机理和控制机制，因此可以根据计划的井眼轨迹形成井眼轨迹控制方案，并且可以在钻井过程中控制和监测可控钻井工具的运行特性。

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