Tool Face Orientation by Using an Electric-Hydraulic Orienter during Coiled Tubing Drilling
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摘要: 针对连续管钻井过程中工具面难以及时摆正的问题，研究了连续管钻井电液定向装置工具面调整方法。在设计连续管钻井电液定向装置结构的基础上，应用空间圆弧轨迹矢量描述方法，按照工具面调整方式及该电液定向装置的结构特点，提出了适合该装置调整工具面的方法，并建立了滑动螺母运动位移与工具面调整角度的函数模型。研究发现，控制滑动螺母在一个行程（0~110 mm）内往复轴向移动，可带动定向装置中的螺旋芯轴双向旋转工具面；工具面角在0°~360°范围内变化时，滑动螺母运动位移与工具面角调整量呈“折线”关系，且在每条“折线”的两斜直线段上，滑动螺母运动位移随工具面角调整量均呈线性增加关系。研究结果表明，该新型连续管钻井电液定向装置的工具面调整方法切实可行，有助于提高连续管钻井效率，有利于推动国内连续管钻井技术的研究与应用。Abstract: To adjust tool face of BHA during coiled tubing drilling (CTD), an electric-hydraulic orienter (EHO) was designed after analyzing the method and principle of such adjustment. With a vector description of the space circular arc wellbore trajectory and with a consideration of structures of the orienter and the relevant adjustment techniques, the method of adjustment was established. In addition, the function model for displacement of the sliding nut and orientation of the tool surface was constructed. By using the newly developed adjustment method, the tool face angle could be adjusted precisely between 0°to 360° by controlling the reciprocating movement of the piston in one trip (0-110 mm). Research results showed that with the tool face angle modified between 0° and 360 °, the movement displacement of the sliding nut and the adjustment of tool face angle was in a "broken line" relationship. In each "line" of the two inclined straight line segments, the movement displacement of the sliding nut increases linearly with the change of the tool face angle adjustment. The tool face adjustment method of the new EHO was determined to be feasible. The newly developed EHO could effectively enhance drilling efficiency of CTD. In addition, the EHO with the tool face adjustment method would meet the requirements for CTD and would contribute to development of CTD in China.
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