C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
C08L 33/26 (2006.01) C08J 3/24 (2006.01) C08J 7/04 (2006.01) C09K 8/588 (2006.01) E21B 43/22 (2006.01)
Patent
CA 2721957
This invention is directed to a composition comprising encapsulated expandable polymeric microparticles including expandable base microparticles encapsulated in a shell of at least one layer of a labile or degradable encapsulation material. The encapsulated microparticles have an unexpanded volume average particle size diameter of from about 0.05 to about 5,000 microns. 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 encapsulées comprenant des microparticules à base expansible encapsulées dans une coque d'au moins une couche d'un matériau d'encapsulation labile ou dégradable. Les microparticules encapsulées ont un diamètre particulaire moyen de volume non expansible allant d'environ 0,05 à environ 5 000 microns. 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
Kurian Pious
Ramesh Manian
Reed Peter E.
Showalter Brett M.
Borden Ladner Gervais Llp
Nalco Company
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