Fuse used in perforating gun for perforating oil and gas boreholes comprises lines of explosive with surfaces lying longitudinally next to each other, and permeable wall separating surfaces

摘要

A fuse comprises at least two lines (100) of explosive with surfaces lying longitudinally next to each other; and a permeable wall (110) separating the surfaces. An Independent claim is also included for an explosion tool containing one or more explosive charge devices arranged in a housing, and an ignition switching circuit containing the fuse. Preferred Features: The fuse has at least one inner line of explosives embedded in an outer longitudinal line of explosives. The permeable wall lies between the inner and outer lines of explosives. The permeable wall has holes (114).