Immiscible oil recovery process

Details Immiscible oil recovery process Immiscible oil recovery process

1985-04-22

1986-10-21

Novosad, Stephen J.

Wells

Processes

Distinct, separate injection and producing wells

E21B 4322

Patent

active

046179968

ABSTRACT:
A flooding process for oil recovery which is carried out under conditions of immiscibility or near-immiscibility, employs a displacing fluid such as carbon dioxide and an additive such as ethane which increases the solubility of the displacing fluid in the reservoir oil. The additive is injected in a slug with the displacing fluid preferably followed by a slug of water to improve sweep, after which displacing fluid alone may be injected to extract residual additive and oil. A number of slugs of displacing fluid, either by itself or with the additive may be injected, with intervening slugs of water and finally, water injection may be made to termination.

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patent: 3661208 (1972-05-01), Scott et al.
patent: 3687198 (1972-08-01), Hearn et al.
patent: 4136738 (1979-01-01), Haynes, Jr. et al.
patent: 4372381 (1983-02-01), McMillen

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