连续管钻井液压定向器的研制

Hydraulic Orientation Tool for Coiled Tubing Drilling

连续管钻井定向器是连续管钻井必不可少的一种工具,但现有液压棘轮式定向器存在单次转向角度大,转向精度低且单次转向角度不可调等缺陷。为此,设计了连续管钻井液压定向器。该定向器通过控制地面泵的排量和压力来完成转位和复位动作,实现对井下工具面角的调整;同时可以在入井前改变转角控制机构的长度,来控制单次转位角度。对该定向器的工作排量及输出扭矩进行了计算,确定其工作参数为:转角可调范围5°~30°,工作排量8.02~12.74 L/s,最大扭矩89.46~125.37 N·m。通过对关键部件进行强度校核,验证了工具结构设计的合理性。地面测试结果表明,该液压定向器能够根据排量的变化来控制转位动作,从而达到调整工具面角的目的。

Because the coiled tubing is not rotatable, the coiled tubing orientation tool becomes an indispensable device for coiled tubing drilling.However, the existing hydraulic ratchet-type orientation tool has such defects as high single turning angle, inferior orientation accuracy and unadjustable single turning angle.To address the problem, a coiled tubing drilling hydraulic orientation tool was designed.This tool executes the orienting and resetting action by controlling the displacement and pressure of the ground pump, thus realizes the adjustment of the tool face angle.The length of the turning angle control mechanism can be changed before run-in-hole to control the single orienting angle.The working displacement and output torque of the orientation tool are calculated to determine the working parameters: the adjustable angle range is 5°~30°, the working displacement is 8.02~12.74 L/s, and the maximum torque is 89.46~125.37 N·m.The rationality of the tool structure design was verified by stress check of the key components.The ground test results showed that the hydraulic orientation tool can control the orienting action by controlling the displacement, and consequently achieve the purpose of adjusting the tool face angle.