IMPLOSIVE DEVICE TO CLEAN WELLS ( VERSIONS ) Russian patent published in 2000 - IPC

FIELD: running in and repair of wells, cleaning of wells from mud deposits and mud plugs. SUBSTANCE: in agreement with first version implosive device includes packer put on tubing string between enclosure-trap and cleaning valve that has through conduit and thimble housing end of pipe that feeds reagent and communicates with pipe clearance. According to second version device includes cleaning valve in the form of hollow plunger with radial windows whose blind end is located in cylinder. Open end of plunger is anchored on trap-enclosure. In correspondence with third version device incorporates cleaning valve that includes lock coming in the form of individual segments moving in axial and radial directions and interacting with shut-off ball and rest attached to body of cleaning valve with the use of shear pin. Seat of cleaning valve is spring-loaded and can move in axial direction. Internal surface of body has bore which provides for possibility of radial movement of segments of lock. EFFECT: provision for working of large volume of mud deposits, conducting of complex operations during single sinking of suspension of tubing string, simplified design of device, enhanced efficiency and rate of cleaning. 9 cl, 7 dwg