Research on Dynamic Characteristics of Friction and Drag Reduction of Hydraulic Clutch

Bending sliding steering technology and rotary steering technology are two existing directional drilling technologies. A common technique for directional and horizontal wells is sliding steering. In the directional drilling process, the drill string is subjected to great resistance, resulting in low drilling efficiency and mechanical drilling speed, which severely limits the length of the horizontal section. Although rotary drilling can improve drilling efficiency, rotary guides are expensive to manufacture and use. In order to solve the problem of large friction generated during directional well sliding, a hydraulic coupling directional well drilling tool is proposed. The tool has the ability to adjust the torque transmitted from the upper drill string to the lower drill string, thereby continuously rotating above the drill string during the directional drilling phase, thereby reducing friction. Based on the borehole action model of the drill string and the rock action model of the drill bit, we established the dynamic model of the hydraulic clutch drill string system. Through evaluation based totally on the dynamic mannequin and actual drilling parameters, we reap the dynamic consequences of the drill string gadget with hydraulic clutch and evaluate it with the dynamic results of the drill gadget except without hydraulic clutch. The results show that the hydraulic grasp can efficiently minimize the friction of the drill string machine and suppress the stick-slip vibration at the drill bit. The results of this study further confirm that the use of hydraulic clutches can decrease the occurrence of friction during directional drilling.