Crosslinked swellable polymer

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 33/26 (2006.01) C08J 3/075 (2006.01) C08J 3/24 (2006.01) C08J 9/236 (2006.01) C08K 5/04 (2006.01) C08L 71/02 (2006.01) C09K 8/588 (2006.01) E21B 43/267 (2006.01)

Patent

CA 2753520

The invention is directed to stable crosslinked water-soluble swellable polymers, methods for making same, and their various uses in the hygiene and medical arts, gel electrophoresis, packaging, agriculture, the cable industry, information technology, in the food industry, papermaking, use as flocculation aids, and the like. More particularly, the invention relates to a composition comprising expandable polymeric microparticles having labile crosslinkers and stable crosslinkers, said microparticle mixed with a fluid and an unreacted tertiary crosslinker that is capable of further crosslinking the microparticle on degradation of the labile crosslinker so as to form a stable gel. 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 well cause degradation of the labile crosslinker and when the particle expands, the tertiary crosslinker crosslinks the polymer to form a stable gel, thus diverting water to lower permeability regions and improving oil recovery.

L'invention concerne des polymères réticulés hydrosolubles stables et gonflables, des procédés pour les fabriquer et leurs diverses utilisations dans les domaines de l'hygiène et de la médecine, en électrophorèse sur gel, emballage, agriculture, industrie du câble, technologies de l'information, industrie alimentaire, fabrication du papier, utilisation comme auxiliaires de floculation et des applications similaires. Plus particulièrement, l'invention concerne une composition comprenant des microparticules polymères expansibles comprenant des agents réticulants labiles et des agents réticulants stables. Lesdites microparticules sont mélangées à un fluide et à un agent réticulant tertiaire n'ayant pas réagi qui est capable de réticuler ultérieurement les microparticules lors de la dégradation de l'agent réticulant labile de façon à former un gel stable. Une utilisation particulièrement importante est celle de fluide d'injection dans la production de pétrole, dans laquelle les particules polymères expansibles sont injectées dans un puits, et lorsque la chaleur et/ou le pH du puits provoquent la dégradation de l'agent réticulant labile. Lorsque les particules s'expansent, l'agent réticulant tertiaire réticule le polymère pour former un gel stable, ce qui détourne ainsi l'eau vers des régions de plus faible perméabilité et améliore la récupération du pétrole.

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