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US 4,460,791 AGranted
Oil recovery by fluorochemical surfactant waterflooding
AssigneeCiba-Geigy Corporation
InventorThomas W. Cooke
Life of this patent
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Abstract
The instant invention relates to the recovery of oil from subterranean oil reservoirs involving the injection of an aqueous based liquid containing a fluorochemical surfactant possessing an oleophobic-hydrophobic fluoroaliphatic group, a hydrophilic group and an oleophilic group, optionally in conjugation with a conventional enhanced oil recovery surfactant.
Claims2
A compound of the formula ##STR56## wherein R.sub.f is straight or branched chain perfluoroalkyl of 4 to 20 carbon atoms;
- s is 5-30;
- and
- R.sub.HC is alkyl of 6-24 carbon atoms or a group of the formula ##STR57## where n.sub.4 is 0 or 1,
- R.sub.7 is alkyl of 3-20 carbon atoms;
- and
- R.sub.8 is hydrogen, halo, nitro or R.sub.7.
3 more elements
Dependencies are inferred from the claim text.