E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
31/14
E21B 43/22 (2006.01) C07C 2/68 (2006.01) C09K 8/592 (2006.01) E21B 43/24 (2006.01)
Patent
CA 1285379
ABSTRACT OF THE INVENTION A process is provided for the enhanced recovery of oil with steam in reservoirs containing high concentrations of dissolved salts, wherein certain diaryl sulfonated surfactants are employed in conjunction with the steam which posses high tolerance for said salts. These surfactants are comprised of compositions having (1) two aromatic rings in their nucleus, such as diphenyl, diarylalkane, or naphthalene groups; (2) at least one alkyl group having 18 or more carbon atoms; and a second alkyl group having from 1-4 carbon atoms; and (3) two functional groups comprising at least one and preferaby two sulfonate groups, although one of the sulfonate groups may be replaced with a carboxyl or hydroxyl groups. At least about 65% of the diaromatic compounds should contain two functional groups, preferably sulfonates, with the remainder comprising a monofunctional - substituted compound containing either a sulfonate group, a carboxylate group, or an hydroxyl group. In a further embodiment of this invention, the diaryl sulfonated surfactants may be admixed with other co-surfactants and/or hydrotropes and silicates. LD/B79
547722
Angstadt Howard P.
Gowling Lafleur Henderson Llp
Sun Refining And Marketing Company
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