Lignosulfonates for high-temperatures plugging

Details Lignosulfonates for high-temperatures plugging Lignosulfonates for high-temperatures plugging

E - Fixed Constructions

21

B

166/33

E21B 43/24 (2006.01)

Patent

CA 1041898

ABSTRACT OF THE DISCLOSURE A method of selective plugging of undesirable high permea- bility streaks and channels in oil-bearing reservoirs during high tem- perature (250°F or higher) injection recovery processes such as steam- flooding, underground combustion, flooding of a naturally occurring high-temperature reservoir or the like. Improved sweep efficiency can be effected by injecting a gel-forming solution consisting essentially of sodium lignosulfonate and water or brine in the absence of other gelation promoters and then allowing the high temperatures of the under- ground formation to promote gelation. Optionally, a precooling water injection step can be used prior to placement of the gel-forming solu- tion. 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 particularly useful in selectively forming firm, strong gels in thief zones for steamflooding recovery operations.

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