PIERCING PERFORATOR FOR FORMATION OF CHANNELS IN CASING STRINGS OF OIL-GAS WELLS Russian patent published in 1996 - IPC

FIELD: oil and gas production, particular, methods for perforation of oil and gas wells. SUBSTANCE: piercing perforator for formation of channels in casing strings of oil-gas wells has body with channel and air chamber. Body accommodate pressure amplifying unit made in form of cylinder which contains spring-loaded piston with rod. Spring-loaded piston has additional rod which forms hollow together with body. The hollow is communicated with air chamber. Body also accommodates working unit. The working unit is made in form of working cylinders hydraulically connected with pressure amplifying unit. Working cylinders accommodate working pistons with piercing devices. Piercing perforator also has the unit supplying working fluid to above-piston hollow. The unit supplying working fluid is made in form of reversible hydraulic pump with reversible electric motor. Above-piston hollow is hydraulically connected with hollow located under piston through channel and reversible hydraulic pump. EFFECT: higher operate reliability due to simplified design and installation of hydraulic pump with electric drive. 3 cl, 1 dwg