Tertiary oil recovery process utilizing a preflush

Details Tertiary oil recovery process utilizing a preflush Tertiary oil recovery process utilizing a preflush

1976-08-30

1979-03-13

Guynn, Herbert B.

Wells

Processes

Distinct, separate injection and producing wells

166273, 252 855D, E21B 4322

Patent

active

041437160

ABSTRACT:
An adjusted salinity and hardness, aqueous preflush containing a thickening material which can be, for example, a hydrophilic material such as polyacrylamide, polysaccharide, polyvinyl aromatic sulfonate, polyethylene oxide, methyl cellulose, etc. or colloidal silica, etc. in a concentration sufficient to increase the viscosity of the adjusted salinity aqueous preflush fluid is injected into a subterranean, petroleum-containing formation. Optionally, the preflush fluid may contain a sacrificial agent, such as sodium tripolyphosphate, etc. The high salinity formation water is efficiently displaced by viscous low salinity aqueous preflush fluid to increase the effectiveness of a subsequently injected high salinity sensitive single surfactant solution. The surfactant may be displaced by a mobility buffer solution, which then may be displaced by water.

REFERENCES:
patent: 3500921 (1970-03-01), Abrams et al.
patent: 3508612 (1970-04-01), Reisberg et al.
patent: 3675716 (1972-07-01), Farmer et al.
patent: 3817330 (1974-06-01), Christopher et al.
patent: 3827497 (1974-08-01), Dycus et al.
patent: 3858676 (1975-01-01), Flournoy et al.
patent: 3868328 (1975-02-01), Boothe et al.
patent: 3977471 (1976-08-01), Gale et al.

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