Compositions for use in steam enhanced oil recovery processes
First Claim
Patent Images
1. A composition comprising:
- (a) steam having a vapor phase and a liquid phase; and
(b) a fluorocarbon surfactant, the liquid phase of the steam having a pH of less than about 11.
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Abstract
A composition for use in enhanced oil recovery procedures comprises steam having a vapor phase and a liquid phase and a fluorocarbon surfactant partitioned between the liquid and vapor phases. The partitioning of the fluorocarbon surfactant between the two phases is accomplished by maintaining the composition'"'"'s pH at less than about 11, and preferably within the range of 7 to about 11. By varying the fluorocarbon surfactant concentration, the composition can be used as a surface tension depressant well stimulation additive and/or as a foam former for selectively blocking more permeable portions of a formation.
24 Citations
33 Claims
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1. A composition comprising:
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(a) steam having a vapor phase and a liquid phase; and (b) a fluorocarbon surfactant, the liquid phase of the steam having a pH of less than about 11. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A composition comprising:
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(a) steam having a vapor phase and a liquid phase; and (b) a surface tension reducing concentration of a fluorocarbon surfactant in the vapor phase. - View Dependent Claims (29, 30)
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31. A composition comprising:
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(a) steam having a vapor phase and a liquid phase; and (b) a sufficient concentration of a fluorocarbon surfactant so that at least about 0.5 ppm by volume of the fluorocarbon is present in a condensate of the vapor phase. - View Dependent Claims (32)
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33. A composition comprising:
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(a) steam having a vapor phase and a liquid phase; and (b) a foam forming concentration of a fluorocarbon surfactant in the vapor phase.
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Specification