Microbiocidal anionic sequesterants with polyvalent metal cations for permeability correction process
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United States of America Patent
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Nov 12, 1985
Grant Date -
N/A
app pub date -
Jul 9, 1984
filing date -
Jul 9, 1984
priority date (Note) -
Expired
status (Latency Note)
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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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