Lignosulfonates for high-temperature plugging

Details Lignosulfonates for high-temperature plugging Lignosulfonates for high-temperature plugging

E - Fixed Constructions

21

B

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E21B 43/22 (2006.01) C09K 8/514 (2006.01) C09K 8/592 (2006.01) E21B 33/138 (2006.01) E21B 43/24 (2006.01) E21B 43/243 (2006.01)

Patent

CA 1041900

ABSTRACT OF THE DISCLOSURE A method of selective plugging of undesirable high per- meability streaks and channels in oil-bearing reservoirs during high temperature (250°F or higher) injection recovery processes such as steamflooding or underground combustion. Improved sweep efficiency can be effected by injecting a gel-forming solution consisting essentially of ammonium lignosulfonate and water or brine in the absence of other gelation promoters and then allowing the high temperatures of the underground formation to promote gelation. Optionally, a precooling water injection step can be used prior to placement of the gel-forming solution. This system has the advantage of gel times which are sufficiently long at temperatures in excess of 250°F to permit placement of large volumes characteristic of commercial use. This method is partic- ularly useful in selectively forming firm strong gels in thief zones for steamflooding recovery operations.

250007

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