DEVICE FOR MULTIPLE HYDROIMPULSIVE IMPACT ON BOTTOM-HOLE ZONE OF PRODUCING FORMATION Russian patent published in 2010 - IPC E21B43/16 

FIELD: oil-and-gas production.

SUBSTANCE: device contains hollow casing with radial channels, partition with axial bore and branch forming chamber, connected to casing sub with saddle, mobile located in branch stepped hollow piston, globe valve, circular spring-loaded valve, installed in stepped hollow piston bypass valve. According to the invention on saddle of sub it is installed rest with spring-loaded support point. Lower the partition it is sealed installed relative to casing valve chamber of globe valve with radial and top angular channels, which is rigidly connected to stepped hollow piston and is implemented with ability of interaction of globe valve in bottom position to the rest. In chamber lower than stepped piston it is installed return spring. Spring-loaded circular valve is implemented with ability of interaction to casing at approximation of globe valve to the rest and sealed located in cavity of stepped hollow piston. In stepped hollow piston it is implemented channel with ability of communication of liquid out from circular spring-loaded valve with area of chamber over stepped piston and chamber is implemented sealed and is filled by neutral liquid.

EFFECT: ability of multiple hydroimpulsive impact on productive bed of well and pressure accumulation for its implementation.

6 cl, 2 dwg