METHOD FOR OIL AND GAS WELL CLEANING IN PRODUCTIVE FORMATION AREA AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2014 - IPC E21B37/00 E21B43/16 

FIELD: oil and gas industry.

SUBSTANCE: method for oil and gas well cleaning in productive formation area consists in location of hydro-pulse device at pipe string at the zone of productive formation with formation of annular space. Pumping of flushing fluid at direct and reverse flushing of the well with flushing fluid annular circulation through pumping unit. Hydro-pulse influence and active fluid pumping into the formation by converting the downstream in pipes' cavities into the pulsing upstream in annular space. Elimination of colmatant from formation by multiple automatic alternation of hydro-pulse and momentary depressive effect on productive formation zone. Device for oil and gas well cleaning contains hollow casing with ring lug and conical surface. Cross-beam with axial channel connected to bush and interacting with casing ring lug. Bush and disk valve with axial channel spring-loaded by one spring. Pusher with top projection. Nut located on pusher cylindrical surface of large diameter capable of fixed movement.

EFFECT: increase of oil well cleaning efficiency due to automated complex repressive-depressive effect on treated formation in the course of well back flushing.

2 cl, 1 dwg