Crude oil recovery chemical fluids
First Claim
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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Abstract
A crude oil recovery chemical fluid is described and claimed. This fluid has been shown to exhibit excellent resistance to salt and high temperatures. This crude oil recovery chemical fluid includes a silane compound, an aqueous silica sol 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.
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Citations
14 Claims
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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.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
Specification