Cross-linked polyvinyl alcohols and oil reservoir permeability c

Wells – Processes – Distinct – separate injection and producing wells

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166270, 166273, 166274, 166275, 166295, 166300, 252 8554, 523130, E21B 33138, E21B 4322, E21B 4324

Patent

active

048967238

ABSTRACT:
A novel cross-linked polymer is obtained by cross-linking polyvinyl alcohol with a cross-linking agent which is a mixture of a phenolic component and an aldehyde or a mixture of a naphtholic component and an aldehyde. The resulting polymer is exceptionally thermally stable and, therefore, can be used as an effective permeability control agent in all enhanced oil recovery operations, including steam flooding.

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