초록 ▼

Disclosed is an improved viscous, aqueous, hydrophilic polymer-containing fluid suitable for injection into porous media such as subterranean petroleum-containing earth formations and an oil recovery method in which the aqueous fluid is injected into the subterranean petroleum-containing formation.

Disclosed is an improved viscous, aqueous, hydrophilic polymer-containing fluid suitable for injection into porous media such as subterranean petroleum-containing earth formations and an oil recovery method in which the aqueous fluid is injected into the subterranean petroleum-containing formation. The fluid contains an effective amount of an aromatic treating substance, preferrably benzene, toluene, xylene, and low alkyl-substituted benzene or toluene. The improvement resulting from incorporation of this additive in the polymer fluid includes greatly increased resistance to microbial degradation of the polymer, improved screen factor, and improves the injectivity of the fluid.

대표청구항 ▼

A method of recovering oil from a subterranean, permeable, oil-containing formation penetrated by at least one injection well, and by at least one production well, both wells being in fluid communication with the formation, comprising injecting an aqueous fluid containing a viscosifying amount of a

A method of recovering oil from a subterranean, permeable, oil-containing formation penetrated by at least one injection well, and by at least one production well, both wells being in fluid communication with the formation, comprising injecting an aqueous fluid containing a viscosifying amount of a hydrophilic polymer, wherein the improvement comprises: incorporating in the fluid a bactericidal amount in the range of from 10 to 2000 parts per million of an aromatic treating compound having the following formula: [Figure] wherein R1, R2 and R3 are each hydrogen or C1-C5 alkyl with the total number of carbon atoms in R1, R2 and R3 being from 0 to 5.