ARTICULATED CLUTCH FOR DRILLING STRING CONNECTION WITH DOWNHOLE MOTOR Russian patent published in 2006 - IPC E21B7/08 

FIELD: deviating oil and gas hole drilling, particularly articulated clutches to connect drilling string with downhole motor.

SUBSTANCE: articulated clutch comprises end semi-clutch, adapter, hollow shaft with spherical support abutment and threaded stem, spherical bearings, sealing pads brought into contact with spherical support abutment of hollow shaft, jaw semi-clutch installed on hollow shaft. End semi-clutch and jaw semi-clutch have torque transmission members cooperating with each other and made as extensions and depressions. Spherical support abutment of hollow shaft is fastened to hollow body installed between the sub and end semi-clutch. One end semi-clutch side includes contact members located in planes parallel to central axis thereof. Another end semi-clutch side has contact members arranged on end semi-clutch periphery. Mating contact members are arranged on jaw semi-clutch or on hollow body correspondingly. Central axis of hollow shaft having spherical support abutment, threaded stem and jaw semi-clutch installed on the hollow shaft define a cramp angle with respect to hollow body axis and sub threadedly connected to the hollow body, wherein the cramp angle is equal to 10% of maximal deviation angle of central hollow shaft axis and jaw semi-clutch installed on the hollow shaft.

EFFECT: increased drilling accuracy, increased rate of hole deviation change, improved penetration ability due to decreased resistance and stresses in bottomhole assembly.

5 cl, 4 dwg