Organosilicon polymer having nonrandom crosslinkages useful in enhanced oil recovery using carbon dioxide flooding
First Claim
1. A composition comprising a solution of carbon dioxide, a cosolvent, and a polymer,(a) wherein said polymer comprises an organosilicon double-chain polymer having nonrandom crosslinkages that enhance backbone rigidity and(b) wherein said cosolvent is selected from the group consisting of:
- (1) alcohols having from 1 to 8 carbon atoms,(2) aromatics having a single ring and from 6 to 10 carbon atoms,(3) ketones having from 3 to 10 carbon atoms,(4) carboxylic acid esters where the carboxylic acid portion has from 2 to 4 carbon atoms and the ester portion has from 1 to 10 carbon atoms, and(5) hydrocarbons having from 3 to 20 carbon atoms.
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Abstract
A polymer is disclosed that is useful in increasing the viscosity of carbon dioxide. That polymer comprises an organosilicon polymer having nonrandom crosslinkages that enhance backbone rigidity. Preferably, that polymer is a polyalkylsilsesquioxane. That polymer can be used in a method for recovering oil from an underground oil-bearing earth formation penetrated by an injection well and a producing well, in which method carbon dioxide is injected into the formation to displace oil towards the producing well from which oil is produced to the surface. The viscosity of the carbon dioxide injected into the formation is increased at least three-fold by the presence of a sufficient amount of the polymer and a sufficient amount of a cosolvent to form a solution of the polymer in the carbon dioxide.
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Citations
11 Claims
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1. A composition comprising a solution of carbon dioxide, a cosolvent, and a polymer,
(a) wherein said polymer comprises an organosilicon double-chain polymer having nonrandom crosslinkages that enhance backbone rigidity and (b) wherein said cosolvent is selected from the group consisting of: -
(1) alcohols having from 1 to 8 carbon atoms, (2) aromatics having a single ring and from 6 to 10 carbon atoms, (3) ketones having from 3 to 10 carbon atoms, (4) carboxylic acid esters where the carboxylic acid portion has from 2 to 4 carbon atoms and the ester portion has from 1 to 10 carbon atoms, and (5) hydrocarbons having from 3 to 20 carbon atoms. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification