Method for in situ gasification of a subterranean coal bed

Details Method for in situ gasification of a subterranean coal bed Method for in situ gasification of a subterranean coal bed

1976-04-29

1977-05-31

Novosad, Stephen J.

Wells

Processes

In situ combustion

175 11, 166245, E21B 4324

Patent

active

040263568

ABSTRACT:
The method of the present invention relates to providing controlled directional bores in subterranean earth formations, especially coal beds for facilitating in situ gasification operations. Boreholes penetrating the coal beds are interconnected by laser-drilled bores disposed in various arrays at selected angles to the major permeability direction in the coal bed. These laser-drilled bores are enlarged by fracturing prior to the gasification of the coal bed to facilitate the establishing of combustion zones of selected configurations in the coal bed for maximizing the efficiency of the gasification operation.

REFERENCES:
patent: 2788956 (1957-04-01), Pevere et al.
patent: 2906337 (1959-09-01), Hennig
patent: 3004594 (1961-10-01), Crawford
patent: 3283814 (1966-11-01), Schlicht et al.
patent: 3297876 (1967-01-01), De Maria
patent: 3734184 (1973-05-01), Scott
patent: 3775073 (1973-11-01), Rhoades
patent: 3933447 (1976-01-01), Pasini et al.
Maurer, "Novel Drilling Techniques", March 1968, Pergamon Press, N. Y., N. Y., pp. 87-91.

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