Partially crosslinked polymer used in correcting subterranean fo

Wells – Processes – Distinct – separate injection and producing wells

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166273, 166294, E21B 4322, E21B 33138

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active

039813630

ABSTRACT:
A method is provided for obtaining good residual resistance factor at relatively low ratios of crosslinking agents to polymer for plugging fractured or porous media using a method of injecting into the formation a first aqueous polymer solution followed by an injection of crosslinking agents capable of gelling the polymer solution and thereafter injecting a second aqueous polymer solution that is capable of being gelled by the crosslinking agents. In each of the aqueous polymer solutions the polymer is already partially crosslinked before the polymer solution is injected into the formation. This process is applicable to production wells and injection wells.

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patent: 3809160 (1974-05-01), Routson
patent: 3833061 (1974-09-01), Gall
patent: 3926258 (1975-12-01), Hessert et al.

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