Swellable polymers with hydrophobic groups

Details Swellable polymers with hydrophobic groups Swellable polymers with hydrophobic groups

C - Chemistry, Metallurgy

08

L

C08L 33/26 (2006.01) C08J 3/24 (2006.01) C08J 9/236 (2006.01) C08L 33/06 (2006.01) C08L 71/02 (2006.01) C09K 8/588 (2006.01) E21B 43/267 (2006.01)

Patent

CA 2753522

The invention is directed to crosslinked water-soluble swellable polymers, methods for making same and their various uses. More particularly, the invention relates to a composition comprising expandable polymeric particles being made with 0.1-5% hydrophobic monomers and labile crosslinkers and stable crosslinkers, said particles mixed with a fluid. A particularly important use is as an injection fluid in petroleum production, where the expandable polymeric particles are injected into a well and when the heat and/or pH of the target zones in the formation cause degradation of the labile crosslinker and when the particle expands, the hydrophobic groups associate to form a hydrophobically associative polymer, thus diverting water to lower permeability regions and improving oil recovery.

L'invention concerne des polymères dilatables hydrosolubles réticulés, des procédés de fabrication associés, ainsi que les diverses utilisations de ces polymères. L'invention concerne plus particulièrement une composition contenant des particules polymères expansibles constituées de 0,1 à 5% de monomères hydrophobes et de réticulants labiles et de réticulants stables, ces particules étant mélangées avec un fluide. Une utilisation particulièrement importante des polymères selon l'invention est sous forme de fluide d'injection dans la production de pétrole, les particules polymères expansibles étant injectées dans un puits et, lorsque la chaleur et/ou le pH des zones cibles dans la formation entraîne la dégradation du réticulant labile et que la particule se dilate, les groupes hydrophobes s'associent pour former un polymère hydrophobiquement associatif, ce qui détourne l'eau vers des zones de perméabilité inférieures et améliore la récupération du pétrole.

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