HOISTING EQUIPMENT FOR OPERATION OF WELLS Russian patent published in 1999 - IPC

FIELD: mining industry. SUBSTANCE: equipment can be used for operation of gas and oil wells. Hoisting facility has body. Arranged in axial passage of body is pipe connection which by its upper end is coupled to string of lift pipes. Accommodated inside body are sealing collar, axle box, and inhibiting valves. Pipe connection is provided with external annular protrusions and radial passage. Coupled to pipe connection is shear seat with ball-type locking member. Installed concentrically between body and pipe connection is piston with sleeve connected to it. Sleeve and body have axial through slots in side surface. Installed externally of body is sealing member. Arranged between sealing member and pipe connection are shaped pushers which are made up of bases and flats. Bases of shaped pushers are seated in axial slots of body and sleeve. Flats are configurated as splittable sector-like components. They interact with sealing member. Radial passage makes pipe passage of lift string communicating with internal space. Aforesaid embodiment of hoisting facility makes its operation more reliable and simplifies its design. EFFECT: higher efficiency. 2 cl, 1 dwg