DEVICE FOR CLEANING BOTTOM-HOLE OF WELL FROM SEDIMENT ACCUMULATIONS Russian patent published in 1998 - IPC

FIELD: oil production industry. SUBSTANCE: this can be used at subsurface repair of wells. Device incorporates string of pump and compressor pipes which is suspended in well by rope-and-pulley system of hoisting mechanism. Provided in upper part of pump and compressor pipe string are tee-piece with flexible hose, and well head sealing gland. Located in lower part of pump and compressor pipe string is pumping-out unit. Device is provided with shank having bit on its lower end, and slime collector which is located above bit. Pumping-out unit is made in the form of piston connected to lower part of pump and compressor pipe string. Piston has delivery valve, and stop which is located in upper part of shank. Also incorporated in pumping-out unit are cylinder in which piston is located, and suction valve which is located between slime collector and piston. Piston stop and lower end of cylinder are adapted for interaction. Device has several slime collectors arranged successively one above other. Application of aforesaid embodiment of device allows to improve efficiency of cleaning well bottom-hole from sediment accumulations. Design of device is simplified and its service life is prolonged. EFFECT: higher efficiency. 1 cl, 1 dwg