Carbon dioxide stimulated oil recovery process

Details Carbon dioxide stimulated oil recovery process Carbon dioxide stimulated oil recovery process

1985-09-03

1986-10-21

Novosad, Stephen J.

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Processes

With indicating, testing, measuring or locating

166279, 1663051, E21B 4300

Patent

active

046179933

ABSTRACT:
A method for recovering petroleum from a subterranean petroleum formation penetrated by at least one well in fluid communication with the formation, by a cyclic carbon dioxide injection procedure comprising injecting carbon dioxide into the well followed by a soak period, followed by a production of oil from the formation, wherein the improvement comprises introducing a predetermined quantity of hydrocarbon such as high API gravity crude oil, naphtha, kerosene, gasoline or aromatic solvent which will remain liquid at the temperature of the formation into the formation immediately after introducing the carbon dioxide slug and before the soak and production steps, to dissolve high molecular weight fraction of the crude oil left in the flow channels of the formation, which are recovered from the formation in the production phase. The volume of solvent use is sufficient to fill the well and saturate the formation for a distance of from 4 to 10 feet into the formation.

REFERENCES:
patent: 3333637 (1967-08-01), Prats
patent: 3841406 (1974-10-01), Burnett
patent: 3871451 (1975-03-01), Brown
patent: 3954141 (1976-05-01), Allen et al.

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