A controllable bending joint guiding mechanism

Abstract

A controllable bent joint guiding mechanism comprises a rotary outer sleeve, wherein a variable cardan shaft is arranged inside the rotary outer sleeve, the left end of the variable cardan shaft is inserted into an inner eccentric ring, the inner eccentric ring is installed inside an outer eccentric ring and is connected with a spherical bearing in a sleeved mode, an eccentric controller is installed at the left end of the inner eccentric ring, the outer eccentric ring is supported by a bearing and is connected with the motor through a driving shaft, a spherical guiding mechanism is installed at the right end of the variable cardan shaft, the right end of the spherical guiding mechanism is a torque transmission mechanism, a pressure compensation mechanism is installed inside the rotary outer sleeve, and a sealing device is arranged at the right end of the torque transmission mechanism. The controllable bent joint guiding mechanism enables the angular displacement of the variable cardan shaft to be continuously changed, and avoids the phenomenon that the variable cardan shaft is blocked or can not continuously change the angular displacement, thereby stabilizing the guiding direction of a rotary guiding drilling tool. The invention further provides an oval rolling path which enables the stress situations to be improved when steel balls transmit power.

Description

technical field [0001] The invention relates to a rotary steerable drilling tool, in particular to a controllable bending joint guiding mechanism. Background technique [0002] Rotary steerable drilling technology is a cutting-edge automatic drilling technology developed at the end of the 20th century. It has been widely used in some complex structures such as oceans, beach seas, deserts and other formations where the difficulty and cost of exploration and development are greatly increased. It has the characteristics of reducing friction and pipe sticking risk, improving wellbore quality and drilling efficiency, and reducing drilling cost. Therefore, it is the research focus and development direction of modern directional drilling. [0003] The traditional drilling technology relies on the combination of the curved sub and the power drilling tool for steering. angle. This kind of steering drilling tool has simple structure and low cost, and is widely used in the steering o...

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