Method of treating a high temperature formation to permit...

E - Fixed Constructions – 21 – B

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E21B 43/00 (2006.01) C09K 8/588 (2006.01) C09K 8/592 (2006.01) E21B 43/14 (2006.01) E21B 43/20 (2006.01)

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CA 1082102

METHOD OF TREATING A HIGH TEMPERATURE FORMATION TO PERMIT THE USE THEREIN OF TEMPERATURE SENSITIVE HYDROPHILIC, VISCOSITY INCREASING POLYMERS ABSTRACT OF THE DISCLOSURE Polymer flooding is an effective means of in- creasing the sweep efficiency of a displacement process for recovering petroleum from a subterranean, petroleum containing formation; however, most polymers suitable for use in flooding operations hydrolyze or otherwise decompose at temperatures above about 150°F to 200°F, and the tem- perature of many subterranean petroleum-containing formations is in excess of 150°F-200°F. Polymers may be employed in tertiary recovery in formations whose temperatures are greater than the temperature stability limit of the polymer if the formation temperature is first reduced by introducing an aqueous fluid such as water at a temperature substantially below the temperature limit of the polymer into the for- mation for a period of time sufficient to reduce the formation temperature to a value at or below the temperature tolerance level of the polymer. -I-

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