Process for use in blasting in situ retorts and the like

Details Process for use in blasting in situ retorts and the like Process for use in blasting in situ retorts and the like

1982-06-30

1984-08-14

Nelson, Peter A.

Ammunition and explosives

Blasting

Patterned blasting

102313, 102319, 102333, 166286, 166292, 405286, 86 20D, F42D 104

Patent

active

044649932

ABSTRACT:
An improved process is provided for blasting in situ oil shale retorts, and oil and gas wells. In the process, a specially formed concrete plug is installed at a desired depth in a bottomless blast hole and an explosive charge is placed upon the plug and detonated to blast the underground formation. The plug is accurately and reliably set by lowering a canister, which releasably houses a bag support assembly supporting a bag of concrete slurry, to a desired depth into the blast hole. The bag support assembly and bag of wet concrete are subsequently dropped a fixed distance below the canister. The bag of concrete expands, dries, and hardens against the walls of the blast hole to form a permanent stationary plug across the blast hole. In the preferred process, the bag support assembly is formed by casting a concrete disc around a drainpipe, and the bag support assembly is lowered and released from the canister with the aid of an electrically powered sequencer.

REFERENCES:
patent: 2047774 (1936-07-01), Greene
patent: 2216067 (1940-09-01), Clark
patent: 2672200 (1954-03-01), Patterson
patent: 3208521 (1965-09-01), Holland et al.
patent: 3578083 (1971-05-01), Anderson et al.
patent: 3640585 (1972-02-01), Hamilton et al.
patent: 3724550 (1973-04-01), Lanmon
patent: 3872925 (1975-03-01), Owen et al.

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