GEAR FOR WELL CLEANUP DURING ITS OPERATION Russian patent published in 2003 - IPC

FIELD: oil and gas production, mining industry. SUBSTANCE: gear includes upper string of pipes, body possessing internal cylindrical space with valve seat with spring-loaded ball located in it and mounted for axial movement relative to body and for contacting rod. Rod is linked to upper string of pipes and has internal hole along axis with end-cap and slits in butt. Lower string of pipes is also joined to body. Lower string of pipes houses hollow ripper and poppet non-return valve. It has tightening belt, mounting seat and additional weight. Rod is installed with clearance with reference to spring-loaded ball sufficient for ripping clogging without contacting spring-loaded ball. Lower string of pipes is perforated from below to height equal to distance from well bottom to perforation holes in well casing. EFFECT: enhanced efficiency of well cleanup. 2 cl, 2 dwg