TUBING ENGAGEMENT AND DISENGAGEMENT DEVICE Russian patent published in 2017 - IPC E21B23/04 E21B34/10 

FIELD: oil and gas industry.

SUBSTANCE: invention can be used for disengagement and subsequent movable and air-tight engagement of the tubing string (tubing) with downhole equipment. The device for engaging and disengaging the tubing string includes a body, an adapter, a rod, a drop ball, shear screws and a chevron seal. The device is additionally equipped with hydromechanical drive consisting of two annular chambers formed between the control rod and the casing, a reversible piston therebetween formed in the form of protrusion on the control rod which is rearranged by a sealing bushing overlapping in turn two through casing channels opposite to the annular chambers, two through channels in the reversible piston which are serially closed by a plug on an air-tight thread, a double-sided collet installed between the control rod and the upper body, sliding blocks placed in the windows of the upper body, a movable spline connection between the upper and lower bodies, a transition bushing between the upper body and the working rod, a sealing chevron seal located in adapter between the lower body and a pipe with the nipple end, in which the working rod is located.

EFFECT: increasing the device efficiency for engaging and disengaging the tubing string.

2 cl, 5 dwg