Charging large diameter vertical boreholes

Details Charging large diameter vertical boreholes Charging large diameter vertical boreholes

E - Fixed Constructions

21

B

86/5.1

E21B 33/00 (2006.01) F42D 1/10 (2006.01)

Patent

CA 1190421

Abstract Charging Large Diameter Vertical Boreholes A method of charging upwardly extending, large diameter boreholes with cylindrical explosive cartridges is provided employing a longitudinally inflating flexible tube as the pushing mechanism. A fluid-impervious flexible tube is turned over or everted at one end and secured. A fluid, preferably air, at about 3 psi is passed into the tube causing the tube to elongate and the everted tube face to travel along the length of a borehole. An explosive cartridge mounted against the tube face is carried to a desired location in the borehole after which the tube is partly deflated and withdrawn from the borehole.

430041

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