Salt-tolerant alkyl aryl sulfonate compositions for use in enhan

Details Salt-tolerant alkyl aryl sulfonate compositions for use in enhan Salt-tolerant alkyl aryl sulfonate compositions for use in enhan

1986-09-30

1987-10-13

Suchfield, George A.

Wells

Processes

Heating, cooling or insulating

252 8554, E21B 4322, E21B 4324

Patent

active

046992146

ABSTRACT:
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 preferably 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.

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