Method for igniting the top surface of oil shale in an in situ r

Details Method for igniting the top surface of oil shale in an in situ r Method for igniting the top surface of oil shale in an in situ r

1975-05-16

1977-06-07

Novosad, Stephen J.

Mining or in situ disintegration of hard material

Tunnel recovery of fluid material

166259, 166260, E21B 4324, E21B 4326

Patent

active

040279170

ABSTRACT:
An in situ oil shale retort is ignited by directing a combustible inlet gas mixture into an ignition zone extending across the top of the in situ retort and igniting the combustible mixture to create a combustion zone in the in situ retort. The ignition zone has a sufficient volume of interconnected open spaces for the movement of inlet gas through the ignition zone with minimal pressure loss, and the in situ retort below the ignition zone has sufficient void volume that inlet gas can be introduced into the ignition zone and moved downwardly through the in situ retort to the bottom. After ignition of the combustible mixture, additional quantities of a combustible mixture are directed into the ignition zone to maintain the combustion zone. Flue gases generated in the combustion zone are moved from the combustion zone toward the bottom of the in situ oil shale retort to establish a retorting zone on the advancing side of the combustion zone. When a self-sustaining combustion zone is established, introduction of combustible mixture can be terminated and an oxygen supplying gas introduced.

REFERENCES:
patent: 1919636 (1933-07-01), Karrick
patent: 3001775 (1961-09-01), Allred
patent: 3017168 (1962-01-01), Carr
patent: 3537528 (1970-11-01), Herce et al.
patent: 3601193 (1971-08-01), Grady
patent: 3620301 (1971-11-01), Nichols et al.
patent: 3661423 (1972-05-01), Garret
patent: 3692110 (1972-09-01), Grady
patent: 3765477 (1973-10-01), Huisen

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