Method for enhanced recovery of oil from oil reservoirs

Details Method for enhanced recovery of oil from oil reservoirs Method for enhanced recovery of oil from oil reservoirs

C - Chemistry, Metallurgy

09

K

C09K 8/588 (2006.01) E21B 43/20 (2006.01)

Patent

CA 2735942

The present invention provides a method for recovering oil from a subterranean reservoir using waterflooding, wherein the flooding fluid used in the waterflooding process comprises water and one or more ionic polyvinyl alcohol copoly-mers. The use of one or more ionic polyvinyl alcohol copolymers is expected to increase the recovery of oil by improving both the oil/water mobility ratio and the sweep efficiency in reservoirs with a high degree of heterogeneity.

L'invention concerne un procédé de récupération de pétrole à partir d'un réservoir souterrain faisant intervenir une injection d'eau, le fluide d'injection utilisé dans le procédé d'injection d'eau comprenant de l'eau et un ou plusieurs copolymères ioniques d'alcool polyvinylique. L'utilisation d'un ou de plusieurs copolymères ioniques d'alcool polyvinylique est supposée augmenter la récupération de pétrole en améliorant à la fois le rapport de mobilité pétrole/eau et l'efficacité de balayage dans les réservoirs avec un degré élevé d'hétérogénéité.

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