Stabilizing polymer-thickened aqueous alkaline solutions with a

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166270, 166275, 524 83, E21B 4322

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047955759

ABSTRACT:
An oil recovery process in which oil is displaced by a viscous alkaline aqueous solution is improved by using such an aqueous alkaline solution containing a water-thickening polymer partially hydrolyzed polyacrylamide polymer and a stabilizer consisting essentially of a 2-mercaptobenzothiazole in the presence of a sulfur-containing oxygen scavenger. A readily oxidizable alcohol or glycol may also be included.

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Ryles, "Chemical Stability Limits of Water Soluble Polymer used in Oil Recovery Processes", SPE Paper No. 13585, 1985, presented at the International Symposium on Oilfield and Geothermal Chemistry held in Phoenix, AZ, Apr. 9-11.

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