Sequential fluid injection process for oil recovery from a gas c

Details Sequential fluid injection process for oil recovery from a gas c Sequential fluid injection process for oil recovery from a gas c

1992-05-29

1993-12-07

Suchfield, George A.

Wells

Processes

Distinct, separate injection and producing wells

166268, 166274, E21B 4318

Patent

active

052676153

ABSTRACT:
A process is provided for recovering oil from a gas cap in a subterranean oil-bearing formation by injecting a water-alternating-gas cycle into the gas cap via an injection well in fluid communication therewith. The cycle includes a slug of an aqueous fluid and a slug of a non-aqueous gas. The aqueous fluid slug is substantially smaller in volume than the non-aqueous gas slug, the aqueous fluid slug being only of sufficient volume to substantially increase the water saturation of the gas cap without substantially increasing the gas saturation of the gas cap. The two slugs are injected into the gas cap sequentially, thereby displacing at least a portion of the oil in place from the gas cap into a production well. Any number of cycles are performed in sequence until the process is terminated.

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