Post-steam alkaline flooding using buffer solutions

Details Post-steam alkaline flooding using buffer solutions Post-steam alkaline flooding using buffer solutions

1988-04-21

1989-03-21

Novosad, Stephen J.

Wells

Processes

Distinct, separate injection and producing wells

166272, 166273, E21B 4322, E21B 4324

Patent

active

048134830

ABSTRACT:
An enhanced oil recovery process is disclosed for formations that have been subjected to steam flooding. In that process, a weakly-alkaline (pH of less than 10) solution of sodium sesquicarbonate, sodium chloride salt, and an alpha olefin sulfonate dimer foaming agent is injected into the formation, then a nitrogen gas is injected into the formation to form in-situ foams for mobility control, and oil is recovered that is displaced by the sesquicarbonate solution and gas.

REFERENCES:
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patent: 3927716 (1975-12-01), Burdyn et al.
patent: 3929190 (1975-12-01), Chang et al.
patent: 3938590 (1976-02-01), Redford et al.
patent: 3951827 (1976-04-01), Burroughs et al.
patent: 4493371 (1985-01-01), Reisberg et al.
patent: 4609044 (1986-09-01), Lau
patent: 4727938 (1988-03-01), Lau

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