C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
C08L 33/08 (2006.01) C09K 8/588 (2006.01) E21B 43/22 (2006.01)
Patent
CA 2721970
This invention is directed to a composition comprising expandable polymeric microparticles comprising hydrophobic polymers having a backbone with labile pendant groups, the microparticles having an unexpanded volume average particle size diameter of from about 0.05 to about 50 microns. The starting configuration of the hydrophobic polymers constrains the microparticle to an unexpanded volume average particle size diameter of from about 0.05 to about 50 microns. Labile pendant groups on the backbone are subject to hydrolysis under a change in environmental conditions that results in release of the expandable microparticle so that the microparticle expands. The invention is further directed to the use of the composition for modifying the permeability of subterranean formations and increasing the mobilization and/or recovery rate of hydrocarbon fluids present in the formations.
La présente invention concerne une composition comprenant des microparticules polymères expansibles comprenant des polymères hydrophobes ayant un squelette avec des groupes pendants labiles, les microparticules ayant un diamètre particulaire moyen de volume non expansible allant d'environ 0,05 à environ 50 microns. La configuration de départ des polymères hydrophobes limite la microparticule à un diamètre particulaire moyen de volume non expansible allant d'environ 0,05 à environ 50 microns. Des groupes pendants labiles sur le squelette sont soumis à une hydrolyse tout en changeant les conditions environnementales qui résulte en une libération de la microparticule expansible de sorte que la microparticule se gonfle. L'invention concerne en outre l'utilisation de la composition pour modifier la perméabilité de formations souterraines et augmenter le taux de mobilisation et/ou de récupération d'hydrocarbures fluides présents dans les formations.
Chang Kin-Tai
Morris John D.
Borden Ladner Gervais Llp
Nalco Company
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