Method for establishing a combustion zone in an in situ oil shal

Details Method for establishing a combustion zone in an in situ oil shal Method for establishing a combustion zone in an in situ oil shal

1978-04-03

1980-03-11

Pate, III, William

Mining or in situ disintegration of hard material

Tunnel recovery of fluid material

166261, 166302, 299 11, 299 13, E21C 4110, E21B 4324

Patent

active

041925521

ABSTRACT:
An in situ oil shale retort having a top boundary of unfragmented formation and containing a fragmented permeable mass has a pocket at the top, that is, an open space between a portion of the top of the fragmented mass and the top boundary of unfragmented formation. To establish a combustion zone across the fragmented mass, a combustion zone is established in a portion of the fragmented mass which is proximate to the top boundary. A retort inlet mixture comprising oxygen is introduced to the fragmented mass to propagate the combustion zone across an upper portion of the fragmented mass. Simultaneously, cool fluid is introduced to the pocket to prevent overheating and thermal sloughing of formation from the top boundary into the pocket.

REFERENCES:
patent: 3382922 (1968-05-01), Needham
patent: 3460620 (1969-08-01), Parker
patent: 3533469 (1970-10-01), Parker
patent: 3550685 (1970-12-01), Parker
patent: 3741306 (1973-06-01), Papadopoulos

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