Wells – Processes – Distinct – separate injection and producing wells
Patent
1975-09-05
1977-07-26
Novosad, Stephen J.
Wells
Processes
Distinct, separate injection and producing wells
166259, 166272, 166299, E21B 4324, E21B 4326
Patent
active
040376575
ABSTRACT:
Subterranean carbonaceous deposits, such as oil shale or the like, that are located at or close to the surface, are prepared for retorting by drilling blast holes from the surface into the deposit, and blasting, creating a rubble pile that reaches the surface. The surface is sealed by suitable means, and the oil shale is retorted in place. Where a stratum of barren rock lies between the carbonaceous deposit and the surface, the blast holes are drilled and blasted in such a manner as to maximize the fragmentation of the carbonaceous deposit, and minimize the fragmentation of the overlying barren stratum. Where overburden conditions are not suitable for treatment by this method, the overburden is removed by strip mining methods, and the carbonaceous deposits are exposed for treatment by the method described above.
REFERENCES:
patent: 1872016 (1932-08-01), Sherwood et al.
patent: 3291215 (1966-12-01), Nichols
patent: 3409082 (1968-11-01), Bray et al.
patent: 3455383 (1969-07-01), Prats et al.
patent: 3674089 (1972-07-01), Moore
patent: 3841705 (1974-10-01), Girard et al.
patent: 3902422 (1975-09-01), Coursen
Novosad Stephen J.
Suchfield George A.
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