VERSATILE BLASTING CARTRIDGE TO CONDUCT SHOOTING AND BLASTING OPERATIONS IN OIL AND GAS WELLS Russian patent published in 1998 - IPC

FIELD: mining art. SUBSTANCE: invention is intended to blasting initiation of shooting and blasting equipment lowered into oil and gas well on geophysical cable. Versatile blasting cartridge includes case fitted with basic charge of explosive, igniting and pyrotechnic compounds and initiating explosive and inductive pulse communication unit in the form of pulse transformer which primary winding is connected to current-carrying line of geophysical cable and which secondary winding is linked to filament of resistance bridge. Thin-walled tube is placed into safety bushing of strong material. After it igniting compound, pyrotechnic compound with high combustion temperature and high explosive showing in process of exothermic accelerating burning property of transition to explosive reaction are pressed into bushing. Safety tube is put into case with basic charge of explosive. Pulse transformer of inductive pulse communication unit is fabricated in the form of separate component of blasting cartridge encapsulated with plastic, is linked with case over seal housing in which grooves sealing rubber rings are placed by means of tight fit followed by beading of face edge of case. Leads of primary and secondary windings of pulse transformer are sealed. EFFECT: improved functional reliability, protection against unauthorized blasting, capability to withstand hydrostatic pressure up to 100 MPa, simplified design. 4 cl, 1 dwg