Borehole charging method

Details Borehole charging method Borehole charging method

E - Fixed Constructions

21

B

86/5.1

E21B 33/00 (2006.01) E21B 43/1185 (2006.01) F42D 1/045 (2006.01) F42D 1/10 (2006.01) G01V 1/13 (2006.01)

Patent

CA 1155689

Abstract C-I-L 611 Borehole Charging Method A method of charging a borehole with a column of explosives is described wherein the explosive charge is detonable in time-delay sequence by means of electrically initiated detonators The method requires providing a loop of an insulated electrical conductor throughout the length of the borehole and, as the borehole is charged with explosives, sliding electrically actuable time-delay detonators along the wire so as to be positioned at inter- vals throughout the borehole. The detonators are electric- ally coupled to the looped wire by means of slidable toroidal transformer cores. The wire loop, in turn, is electromagnetically energized by means of a second trans- former core and an energy source. The method provides for safe and efficient borehole charging and avoids the hazards associated with usual electric detonator systems.

379095

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