Wells – Processes – With indicating – testing – measuring or locating
Patent
1978-01-12
1979-07-31
Novosad, Stephen J.
Wells
Processes
With indicating, testing, measuring or locating
166259, 299 2, 166303, E21B 4324
Patent
active
041627067
ABSTRACT:
A processing zone advances through a fragmented permeable mass of particles containing oil shale in an in situ oil shale retort in a subterranean formation containing oil shale. The retort has an inlet gas introduced thereto and an effluent gas withdrawn therefrom. To determine the locus of the processing zone, kerogen content of formation at selected locations in the retort is determined before processing the selected locations. Because the difference in pressure between the inlet gas and the effluent gas increases as the kerogen content of formation being processed increases, changes in pressure drop across the fragmented mass can be predicted. By comparing actual changes in pressure drop with predicted change in pressure drop, the locus of the processing zone can be determined.
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Novosad Stephen J.
Occidental Oil Shale Inc.
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