DEVICE FOR UNLOADING A PRODUCTION PIPE STRING IN A WELL

摘要

The device for unloading a production tube string in a well includes the upper and the lower switchers, a body connected with threading to those, the outer surface of that one is in form of an equilateral tetrahedral truncated pyramid on the facets of which slip billets are installed, those are connected to the facets of the body with joint of “dovetail” type and are held in initial position with stoppers, those at operation of the device go to the circular reboring of the movable bush that is installed with possibility of axial displacement in the body and is connected to it by means of a shear pin, with fixation with valve unit placed in it, this comprises a valve socket, circulation chamber and a ball-valve. At that the slip billets are connected to each other with alternation with cramps and are spring-supported with tension springs, those with one end are fixed to cramps, and with the other end to the ring that is fixed on the upper switcher, the shear pin for fixation of the valve unit and the bush are arranged with variable diameters of cuts, and the upper and the lower switchers are arranged as centrators.