Methods and compositions for reducing the permeabilities of...

E - Fixed Constructions – 21 – B

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E21B 43/22 (2006.01) C09K 8/512 (2006.01) C09K 8/575 (2006.01) C09K 8/88 (2006.01) E21B 33/138 (2006.01) E21B 43/02 (2006.01) E21B 43/25 (2006.01)

Patent

CA 2355200

Methods and compositions for reducing the permeabilities of subterranean zones are provided. The methods of the invention are basically comprised of introducing an aqueous composition comprised of a chelated organic gelling agent and a copolymer of an ethylenically unsaturated polar monomer and an ethylenically unsaturated ester or a terpolymer or tetrapolymer of an ethylenically unsaturated polar monomer, an ethylenically unsaturated ester and a monomer selected from AMPS~ and/or N-vinylpyrrolidone into the zone and then allowing the aqueous composition to form a cross-linked gel in the zone.

Cette invention a trait à des procédés permettant de diminuer la perméabilité de sous-sols et aux compositions correspondantes. Ces procédés consistent, essentiellement, à enfouir une composition aqueuse dans la région du sous-sol, composition constituée par un agent gélifiant organique chélaté ainsi que par un copolymère d'un monomère polaire insaturé éthyléniquement et d'un ester insaturé éthyléniquement ou par un terpolymère ou un tétrapolymère d'un monomère insaturé éthyléniquement, d'un ester insaturé éthyléniquement et d'un monomère sélectionné dans le groupe constitué par AMPS~ (acide sulfonique 2-acrylamido-2-méthylpropane) et/ou N-vinylpyrrolidone. On laisse ensuite la composition aqueuse former un gel réticulé dans cette région du sous-sol.

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