HEAT-RESISTANT DETONATING CORD Russian patent published in 2016 - IPC C06C5/04 F42B1/04 

FIELD: blasting operations.

SUBSTANCE: invention relates to explosives and can be used in oil producing industry in perforating operations in wells for initiation of charges of cumulative perforators. Detonating cord contains multilayer outer shell explosive core made from a set of cylindrical tablets from heat-resistant explosive substance (es), between which tablet-separators are installed pressed from inorganic oxidising agents. Tablet-separators can be made of mixture of ammonium nitrate with aluminium powder in weight ratio of 80:20, where ammonium nitrate consists of a mixture of powder standard grain-size composition with ammonium nitrate in nano dispersed state in amount by weight of up to 25 %. In case of comparable in value of density of compact with pellets of the main charge of heat-resistant ES height (weight) of a tablet-separator is not more than 0.25 of corresponding value of a tablet of main charge.

EFFECT: introduction of tablets-separators into design of cord reduces consumption of heat-resistant powerful blasting ES and improving reliability of operation of cord in case of core soaking.

3 cl, 1 dwg, 2 tbl