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US 3,945,437 AGranted
Process for displacing oil using aqueous anionic surfactant systems containing aromatic ether polysulfonates
AssigneeShell Oil Company
InventorsYing-Chech Chiu, Harold J. Hill
Life of this patent
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Abstract
The properties of an aqueous surfactant system for displacing oil within a permeable medium are improved by adding an aromatic ether polysulfonate to the system. This improves the tolerance of the system toward salts of monovalent and/or multivalent cations, and also causes emulsions formed between the oil and the oil-displacing system to be less viscous and less stable.
Claims10
In a process in which an aqueous anionic surfactant system is injected into a relatively remotely located oil-containing permeable medium to displace oil within the medium, the improvement comprising:
- injecting an aqueous anionic surfactant system that contains a proportion of aromatic ether polysulfonate that improves the salt tolerance of the system without significantly reducing the interfacial tension-lowering activity of the system, said aromatic ether polysulfonate being a preferentially water-soluble compound that contains one ether group attached to at least one aromatic radial and contains from about 1.8-2 sulfonate groups per molecule.
Dependencies are inferred from the claim text.