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Crude oil recovery chemical fluids

  • US 10,563,117 B2
  • Filed: 09/12/2018
  • Issued: 02/18/2020
  • Est. Priority Date: 09/13/2017
  • Status: Active Grant
First Claim
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1. A crude oil recovery chemical fluid which is excellent in resistance to high temperature and salt, comprising a silane compound, an aqueous silica sol comprising colloidal silica particles dispersed in an aqueous solvent having an average particle diameter of from about 3 nm to about 200 nm, two or more anionic surfactants, and one or more nonionic surfactants, wherein the aqueous silica sol has a silica concentration of about 5% to about 55% by mass;

  • and wherein the aqueous silica sol is present in an amount of from about 3% by mass to about 30% by mass, based on the total mass of the crude oil recovery chemical solution, in terms of silica solid content, wherein the aqueous silica sol comprises silica particles in which at least a part of the silane compound is bonded on the surface of at least a part of the silica particles in the sol.

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