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US 4,055,122 AGranted
Method of placing blasting charges in wet boreholes
AssigneeGulf Oil Corporation
InventorBarney P. Muldrow, Jr.
Life of this patent
Estimating the term…
Abstract
In the quarrying of wet, poorly consolidated rock in which blasting charges are placed with the aid of a removable metal casing to prevent collapse of the walls of the boreholes, improved results are obtained by placing cardboard tubing inside the removable metal casing with internal bushings reinforcing the tubing joints instead of using external collars or connectors.
Claims1
The method of placing an aqueous gel explosive charge in a water-filled borehole in a poorly consolidated rock formation comprising the steps:
- a. placing sections of cardboard tubing end-to-end inside a removable casing which is standing in a borehole containing water, while reinforcing and connecting the ends of the sections of cardboard tubing together by placing a close-fitting tubular bushing of sufficient compressive strength inside and extending for a substantial distance inside the ends of adjacent sections of tubing;
- b. removing the removable casing which surrounds the cardboard tubing, and
- c. filling the inside of the connected sections of cardboard tubing with an aqueous gel explosive composition.
Dependencies are inferred from the claim text.