Wells – Processes – With indicating – testing – measuring or locating
Patent
1984-03-26
1986-06-17
Novosad, Stephen J.
Wells
Processes
With indicating, testing, measuring or locating
166259, 166261, 166 64, 166302, E21B 43243, E21B 4706
Patent
active
045950563
ABSTRACT:
A method is provided for operating an in situ oil shale retort in a subterranean formation containing oil shale. The retort contains a fragmented permeable mass of formation particles containing oil shale, within top, bottom and side boundaries of unfragmented formation. A drift is in communication with a lower region of the fragmented mass for withdrawal of liquid products of retorting and an off-gas comprising gaseous products of retorting. A gas-sealing bulkhead is placed across the product withdrawal drift and a water spray is installed in the drift through the bulkhead. An upper region of the fragmented mass is ignited for establishing a combustion zone therein. A retort inlet mixture comprising an oxygen-supplying gas is introduced into the top of the fragmented mass for advancing the combustion zone downwardly through it to thereby establish a retorting zone on the advancing side of the combustion zone for producing the liquid and gaseous products. A retort off-gas comprising such gaseous products is withdrawn from the retort through the product withdrawal drift. The temperature of the off-gas is monitored in the vicinity of the gas-sealing bulkhead. When the off-gas temperature reaches a selected value below the design temperature of the bulkhead, sufficient water is sprayed into the off-gas stream in the drift to maintain the temperature of the off-gas in the vicinity of the bulkhead below its design temperature.
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Jacobson Carl L.
Shen Jian-Chyun
Zahradnik Raymond L.
Novosad Stephen J.
Occidental Oil Shale Inc.
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