WELL HOLLOW-CARRIER JET-TYPE PERFORATOR Russian patent published in 2003 - IPC

FIELD: well hollow-carrier jet-type perforators; applicable in recovery of liquid and gaseous media from drilled wells, particularly, in secondary tapping of producing formations. SUBSTANCE: perforator has body in form of a row of sections-modules; jet charges, adapters. Jet charges are interconnected by means of detonating cord. Adapters connect sections with one another and devices transmitting detonation from module to module. Detonating circuit in form of detonating cord between modules includes successively explosive cartridge-detonation transmitter, steel barrier plug, explosive cartridge-receiver. Steel barrier plug is screwed into upper part of adapter central hole. Explosive cartridge-receiver is connected with the second explosive cartridge-transmitter by a length of heat resistant detonating cord. The second explosive cartridge-receiver is installed at beginning of detonation circuit of next module. Explosive cartridges-receivers are installed with clearances ensuring guaranteed operation of entire perforator under operating conditions and guaranteed nonoperation in case of system seal failure, particularly, the first clearance of not in excess of 10 mm from surface of steel barrier plug, and the second clearance in 12-25 mm from end of the second explosive cartridge-transmitter. EFFECT: provided serviceability under conditions of barothermic effect (150 MPa and plus 180C) and ceasing of detonation transmission with failed sealing system. 5 cl, 1 dwg