DEVICE FOR DEVELOPMENT OF PERFORATION CHANNELS OF DEEP PENETRATION IN OIL AND GAS WELLS Russian patent published in 2010 - IPC E21B43/114 

FIELD: oil and gas industry.

SUBSTANCE: device for development of perforation channels in wells includes puncheons located in housing, each of which has piston and washing channel for supply of working fluid and installed with possibility of being moved in radial direction under action of working fluid pressure. Device is equipped with pressure transducer installed in housing, intended for being connected to tubing strings and having through channel passing through its piston and plunger, as well as with hydromechanical switching lock of fluid flow. At that, hydromechanical lock is installed in the above channel and includes two check valves spring-loaded to opposite sides. Plunger has a stop interacting with the first check valve with possibility of its opening at creation of working fluid pressure in tubing string and providing the supply of working fluid flow from tubing string to housing cavity and action of puncheons on pistons. At that, seat of the second check valve is fixed on piston of pressure transducer with possibility of being opened at relief of working fluid pressure in tubing string.

EFFECT: improving manufacturability, increasing capacity of perforation process and quality of formation drilling.

3 cl, 3 dwg