Wells – Processes – Distinct – separate injection and producing wells
Patent
1989-04-07
1991-02-05
Suchfield, George A.
Wells
Processes
Distinct, separate injection and producing wells
166273, 252 8551, 252 8554, E21B 4322
Patent
active
049896741
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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Chevron Research Company
Keeling Edward J.
Schaal Ernest A.
Suchfield George A.
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