C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
C08L 33/26 (2006.01) C08J 3/24 (2006.01) C08L 51/08 (2006.01) C09K 8/588 (2006.01) E21B 43/32 (2006.01)
Patent
CA 2721960
This invention is directed to a composition comprising crosslinked expandable polymeric microparticles comprising structured polymers having labile crosslinks or having a labile core and non- labile crosslinks. The starting configuration of the structured polymers constrains the microparticle to an unexpanded volume average particle size diameter of from about 0.05 to about 5,000 microns. Labile crosslinks or the labile core of the structured polymers are subject to degradation which results expansion of the microparticle. 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.
L'invention concerne une composition contenant des microparticules polymères expansibles réticulées comprenant des polymères structurés à réticulations labiles, ou à noyau labile et à réticulations non labiles. La configuration de départ des polymères structurés contraint la microparticule à avoir un diamètre particulaire moyen en volume non expansé compris entre environ 0,05 et environ 5000 microns. Les réticulations labiles ou le noyau labile des polymères structurés est sujet à une dégradation qui provoque l'expansion de ladite microparticule. L'invention concerne également l'utilisation de ladite composition pour modifier la perméabilité de formations souterraines et pour augmenter la vitesse de mobilisation et/ou d'extraction de fluides hydrocarbures présents dans lesdites formations.
Chang Kin-Tai
Kurian Pious
Borden Ladner Gervais Llp
Nalco Company
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