Downhole torque control tool for milling operation

• Main Authors: ZHANG XIONGTAO, ZHANG ANKANG, HU XIANGJUN, BAI XIAOPEI, SHAO YUAN
• Format: Patent
• Language: English
• Published: 07.10.2015
• Subjects: EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS

The invention provides a downhole torque control tool for milling operation. The downhole torque control tool for the milling operation comprises a body which is a tubular body provided with through holes in the circumferential direction, each through hole is provided with a torque anchor palm which is in clearance fit with the through hole, the torque anchor palms are perpendicular to the axial direction of the body, the anchoring end of each torque anchor palm is provided with anchor teeth and a counter bore which are parallel to the axial direction of the body, a stretchable spring is arranged in each counter bore, a pressing plate is arranged at the lower ends of the stretchable springs, and the pressing plate is fixedly connected with the body; the end size of the other end of each torque anchor palm is larger than the inner diameter of the top of the corresponding through hole. According to the downhole torque control tool for the milling operation, drill pressure fluctuation brought by deformation of an operation tubular column in a shaft due to the fact that the operation tubular column bears inverted torque is effectively avoided, on the premise of not affecting the axial movement of the operation tubular column, the safety risks brought by tubular column tripping and reverse twisting of the tubular column on the shaft head are decreased, power torque output by a screw motor is stably controlled on a front section milling tool, the drilling grinding stability is improved, and the milling efficiency is improved.