Carbon dioxide miscible displacement process

Details Carbon dioxide miscible displacement process Carbon dioxide miscible displacement process

1985-06-24

1987-02-17

Suchfield, George A.

Wells

Processes

Cyclic injection then production of a single well

166266, E21B 4322, E21B 4340

Patent

active

046432523

ABSTRACT:
There is provided a reliable carbon dioxide miscible displacement process wherein a propane-rich in place oil transition zone is created by huff and puff techniques. The enriched oil transition zone uses less LPG solvent per unit volume and is less critical or has greater tolerance to reservoir conditions than a carbon dioxide process would otherwise have if the propane were injected as a displacing slug. The huff stage of injection of the propane material may be followed by a period of shut in. The process may be repeated several times. Propane injection also demethanizes the zone around the injection well, thereby removing methane which interferes with development of miscibility between carbon dioxide and in place oil. After creation of the transition zone, carbon dioxide with or without other fluids is injected to displace oil from the reservoir.

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patent: 3465823 (1969-09-01), Jacoby et al.
patent: 4467868 (1984-08-01), Adamache
patent: 4558740 (1985-12-01), Yellig, Jr.

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