Hydraulic Orientation Tool for Coiled Tubing Drilling

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.