Water flooding process using multiple fluids

Details Water flooding process using multiple fluids Water flooding process using multiple fluids

1979-08-02

1981-09-29

Leppink, James A.

Wells

Processes

Distinct, separate injection and producing wells

E21B 4322

Patent

active

042917654

ABSTRACT:
A process for the recovery of oil from a subterranean formation containing oil, which is preferably a residium from a prior recovery operation which comprises injecting into said formation a first treatment fluid comprising an aqueous solution of polymer of 50 ppm to 5000 ppm polymer, for example a partially hydrolyzed polyacrylamide, in an amount of from 0.5 to 100% pore volume of the formation and thereafter injecting into said formation a second treatment fluid comprising a mixture of an aqueous solution of polymer and from 0.01 to 3.5 weight percent caustic, for example NaOH, in an amount of from 0.5 to 100% pore volume of the formation and recovering oil from the formation.

REFERENCES:
patent: 1651311 (1927-11-01), Atkinson
patent: 3367418 (1968-02-01), Routson
patent: 3372748 (1968-03-01), Cook
patent: 3493051 (1970-02-01), Gogarty
patent: 3684011 (1972-08-01), Presley et al.
patent: 3825067 (1974-07-01), Vestal
patent: 4018281 (1977-04-01), Chang

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