Miscible displacement oil recovery method

Details Miscible displacement oil recovery method Miscible displacement oil recovery method

1979-05-17

1981-02-10

Leppink, James A.

Wells

Processes

Distinct, separate injection and producing wells

166302, E21B 4322, E21B 3600

Patent

active

042496071

ABSTRACT:
An improved miscible displacement oil recovery process, and particularly a vertical downward gas driven miscible blanket oil recovery process is disclosed. Reduction of temperature in the portion of the reservoir where miscible displacement is occurring reduces the pressure required to attain miscibility with a specified solvent-dry gas injection mixture; or at constant pressure, reduces the amount of solvent required to be injected to achieve a condition of miscibility. Cooling is achieved by chilling the solvent prior to injecting it into the reservoir, or cooling the high pressure dry gas injected into the reservoir, or both.

REFERENCES:
patent: 2259428 (1941-10-01), Shelley
patent: 3135326 (1964-06-01), Santee
patent: 3439743 (1969-04-01), Wyllie
patent: 3841403 (1974-10-01), Burnett et al.
patent: 3850243 (1974-11-01), Allen et al.
patent: 3850245 (1974-11-01), Allen et al.
patent: 3856086 (1974-12-01), Braden, Jr.
patent: 3989108 (1976-11-01), Allen
patent: 4003432 (1977-01-01), Paull et al.

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