Enhanced oil recovery

Details Enhanced oil recovery Enhanced oil recovery

1984-01-23

1985-04-09

Suchfield, George A.

Wells

Processes

Cyclic injection then production of a single well

166268, 166273, E21B 4322

Patent

active

045095965

ABSTRACT:
An enhanced oil recovery method which employs a pressurized gas injection process for the miscible displacement of oil from a subterranean geologic formation wherein the gas is injected into the formation so that the pressure in the formation increases above the miscibility pressure for the gas and oil in the formation and such injection is continued until the pressure in the formation approaches but does not exceed the fracture pressure of the formation, terminating gas injection before the formation is fractured, holding the injected gas in the formation to allow it to expand on its own into the formation thereby lowering the pressure in the formation, and injecting additional gas into the formation when the formation pressure has reached a point where it approaches but does not go below said miscibility pressure. The foregoing sequence of steps are repeated as many times as desired.

REFERENCES:
patent: 3123134 (1964-03-01), Kyte et al.
patent: 3266569 (1966-08-01), Sterrett
patent: 3405823 (1969-09-01), Jacoby et al.
patent: 4130163 (1978-12-01), Bombardieri
patent: 4271905 (1981-06-01), Redford et al.
patent: 4450913 (1984-05-01), Allen et al.

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