Methods for recovering oil from an oil reservoir

E - Fixed Constructions – 21 – B

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E21B 43/26 (2006.01) C09K 8/584 (2006.01) E21B 43/20 (2006.01) E21B 43/22 (2006.01)

Patent

CA 2630032

There is a method for enhancing the recovery of oil from a reservoir. The method has the step of a) introducing a flooding fluid into the reservoir and b) extracting the oil through a wellbore at a location different than the point of introduction of the flooding fluid into the reservoir. The flooding fluid has water and an amount of one or more non-polymeric viscoelastic surfactants sufficient to provide an interfacial surface tension of about 1 mNm or less and a viscosity of about 10 cps or more. The one or more surfactants is selected from the group of one or more cationic surfactants, one or more zwitterionic surfactants, one or more amphoteric surfactants, one or more anionic surfactants, and combinations thereof.

L'invention concerne un procédé permettant d'améliorer la récupération de pétrole à partir d'un réservoir de pétrole. Ledit procédé consiste à: a) introduire un fluide d'injection dans le réservoir, et b) à extraire le pétrole d'un puits à un emplacement différent du point d'introduction du fluide d'injection dans le réservoir. Le fluide d'injection comprend de l'eau et une quantité d'un ou plusieurs tensioactif(s) viscoélastique(s) non polymère(s) suffisante pour fournir une tension de surface interfaciale d'environ 1 mNm ou moins et une viscosité d'environ 10 cps ou plus. Le ou les tensioactif(s) est/sont sélectionné(s) dans le groupe constitué d'un ou de plusieurs tensioactif(s) cationique(s), d'un ou de plusieurs tensioactif(s) zwittérionique(s), d'un ou de plusieurs tensioactif(s) amphotère(s), d'un ou de plusieurs tensioactif(s) anionique(s), et des combinaisons de ceux-ci.

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