Apparatus for producing fractures and gaps in geological formati

Details Apparatus for producing fractures and gaps in geological formati Apparatus for producing fractures and gaps in geological formati

1978-12-08

1981-03-10

Novosad, Stephen J.

Wells

With explosive or gas generating means in well

166299, 166308, 166177, E21B 4326

Patent

active

042548284

ABSTRACT:
A method of producing fractures or gaps in geological formations of crystalline rocks in order to utilize the heat of the earth surrounding the gaps, comprises, drilling at least one bore into the rock, producing a pressure fluid in the bore adjacent the rock by introducing pressure gas-producing propellants into the bores to a location within the rock formation and reacting the pellants after they have been sealed off from the top of the bore and discharging the fluid pressure into the bore to put the rock under a pressure above its breaking limit so as to produce a large surface gap. The apparatus advantageously comprises a pressure gas generator which operates from a monergolic propellant which is decomposed catalytically and which includes a sealing bellows arranged around a reaction chamber at the bottom of the bore which is sealed at the upper end or to the rear and is connected with the pressure gas chamber and an outlet into the forming gap having a non-return valve therein.

REFERENCES:
patent: 2766828 (1956-10-01), Rachford, Jr.
patent: 3561532 (1971-02-01), Fletcher
patent: 3630284 (1971-12-01), Fast et al.
patent: 3674093 (1972-07-01), Reese
patent: 3786858 (1974-01-01), Potter et al.
patent: 3863709 (1975-02-01), Fitch
patent: 3878884 (1975-04-01), Raleigh
patent: 3938592 (1976-02-01), Aladiev et al.
patent: 4030549 (1977-06-01), Bouck

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