Method of in situ oil shale retort ignition with oxygen control

Details Method of in situ oil shale retort ignition with oxygen control Method of in situ oil shale retort ignition with oxygen control

1982-06-18

1984-05-15

Suchfield, George A.

Wells

Processes

With indicating, testing, measuring or locating

166259, 299 2, E21B 43247, E21B 4706

Patent

active

044482493

ABSTRACT:
A method for recovering liquid and gaseous products from an in situ oil shale retort containing a fragmented permeable mass of formation particles containing oil shale is provided. A hot ignition gas comprising oxygen at a first selected concentration is introduced into the fragmented mass for heating the fragmented mass top surface. The percentage of the fragmented mass surface that is at a temperature no less than the ignition temperature of oil shale is determined. Thereafter, the concentration of oxygen in the ignition gas is increased by an amount proportional to the determined percentage. Such heating of the fragmented mass top surface establishes a combustion zone in the retort. After the combustion zone has spread horizontally across the retort, introduction of the hot ignition gas is discontinued. Thereafter, an oxygen-supplying gas is introduced into the retort for advancing the combustion zone downwardly through the fragmented mass. Liquid and gaseous products are produced in a retorting zone on the advancing side of the combustion zone and are recovered.

REFERENCES:
patent: 3032102 (1962-05-01), Parker
patent: 3952801 (1976-04-01), Burton
patent: 4027917 (1977-06-01), Bartel et al.
patent: 4245701 (1981-01-01), Chambers
patent: 4369841 (1983-01-01), Cha

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