Oil recovery method

Details Oil recovery method Oil recovery method

1982-09-23

1984-02-07

Suchfield, George A.

Wells

Processes

Cyclic injection then production of a single well

166261, 166272, E21B 4324

Patent

active

044297440

ABSTRACT:
Oil is recovered from an oil-bearing reservoir in a process employing an in-situ combustion process utilizing a combustion-supporting gas containing at least 75% by volume pure oxygen, and preferably substantially pure oxygen, and a sequence in which the production well or wells are cyclically throttled. In place of using an in-situ combustion process, mixtures of steam and carbon dioxide or mixtures of steam and low molecular weight C.sub.3 -C.sub.8 hydrocarbons are injected into the reservoir and the production well is cyclically throttled. The production well flow rate is restricted until the bottom-hole pressure of the well has increased to an amount of about 30% to about 90% of the fluid injection pressure at the injection well. Thereafter, the production well is opened and oil is recovered therefrom as the bottom-hole pressure declines. The throttled production cycle may be repeated at appropriate intervals during the process.

REFERENCES:
patent: 3768559 (1973-10-01), Allen et al.
patent: 4127170 (1978-11-01), Redford
patent: 4133382 (1979-01-01), Cram et al.
patent: 4271905 (1981-06-01), Redford et al.
patent: 4324291 (1982-04-01), Wong et al.

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