Microbiocidal anionic sequesterants with polyvalent metal cation

Details Microbiocidal anionic sequesterants with polyvalent metal cation Microbiocidal anionic sequesterants with polyvalent metal cation

1984-07-09

1985-11-12

Suchfield, George A.

Wells

Processes

Distinct, separate injection and producing wells

166273, 166295, 252 855D, 523130, E21B 33138, E21B 4322

Patent

active

045522170

ABSTRACT:
A water permeability correction process, and composition therefor, to improve the sweep efficiency of waterflooding which involves the sequential injection of (1) an optical aqueous preflush slug to adjust connate water salinity, (2) an aqueous sequestered polyvalent metal cation, such as chromium, wherein the sequestering anion is bactericidal, such as propionate, (3) a gelable polymeric viscosifier, such as polyacrylamide, and, preferably, (4) an aqueous drive fluid.

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patent: 4018286 (1977-04-01), Gall et al.
patent: 4039029 (1977-08-01), Gall
patent: 4488601 (1984-12-01), Hammett

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