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

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

E - Fixed Constructions

21

B

166/36

E21B 43/24 (2006.01) E21B 43/247 (2006.01)

Patent

CA 1102687

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 progagate the combustion zone across an upper portion of the fragmented mass. Simult- aneously, cool fluid is introduced to the pocket to prevent overheating and thermal sloughing of formation from the top boundary into the pocket.

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