Wells – Processes – Distinct – separate injection and producing wells
Patent
1987-12-23
1989-06-27
Suchfield, George A.
Wells
Processes
Distinct, separate injection and producing wells
166275, 252 8554, E21B 4322
Patent
active
048420670
ABSTRACT:
A process for enhanced oil recovery from a subsurface reservoir by surfactant flooding useful for surfactant flooding in reservoirs with great temperature fluctuations or a temperature gradient where surfactants soluble in themselves and effective for oil mobilization do not retain such properties over wide temperature ranges of, e.g., 10.degree. to 100.degree. C. The new process now provides good surfactant effectiveness even at such extreme temporary and/or local temperature fluctuations as between 10.degree. and 100.degree. C. In the process, a mixture of a more readily soluble and a slightly soluble sulfonate is used. The solubilities may be defined in terms of the amount of a cosurfactant necessary for production of a 4% by weight sulfonate solution in synthetic seawater. Such sulfonates include, respectively,
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Huels Aktiengesellschaft
Suchfield George A.
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