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1. (WO2009130170) VISCOELASTIC COMPOSITION WITH IMPROVED STABILITY

Pub. No.:    WO/2009/130170    International Application No.:    PCT/EP2009/054618
Publication Date: Oct 29, 2009 International Filing Date: Apr 17, 2009
IPC: C09K 8/584
Applicants: RHODIA OPERATIONS
MORVAN, Mikel
DEGRE, Guillaume
Inventors: MORVAN, Mikel
DEGRE, Guillaume
Title: VISCOELASTIC COMPOSITION WITH IMPROVED STABILITY
Abstract:
The invention relates to a method for the enhanced recovery of oil from a subterranean formation, in which a viscoelastic aqueous fluid containing at least one viscosifying zwitterionic surfactant is injected into the formation and said fluid is conveyed through the formation in order to displace the oil from the formation and to recover same at a different location from that where the viscoelastic aqueous fluid was introduced. The invention is characterized in that the fluid contains a sufficient amount of a base for the pH thereof to be above 10, preferably between approximately 11 and 13.