Recovering enhanced oil recovery surfactants by temperature cycl

Details Recovering enhanced oil recovery surfactants by temperature cycl Recovering enhanced oil recovery surfactants by temperature cycl

1994-05-16

1995-03-28

Geist, Gary

Earth boring, well treating, and oil field chemistry

Well treating

252331, 252348, 166266, 507254, 507255, 507261, 507936, 507937, E21B 4322, E21B 4340

Patent

active

054014255

ABSTRACT:
A method for recovering surfactants from produced fluids by mixing with produced fluids about 0.1% to about 5% of a nonionic surfactant having a phase inversion temperature above the temperature of the produced fluids, heating the mixture above the phase inversion temperature, mixing the phase containing oil and the surfactants with water, and cooling the mixture below the phase inversion temperature to extract the surfactants into an aqueous phase, provided that if a sufficient concentration of the nonionic surfactant is already in the produced fluids, it need not be added.

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