E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
31/16, 166/31
E21B 43/22 (2006.01) C09K 8/584 (2006.01)
Patent
CA 1145536
SURFACTANT OIL RECOVERY PROCESS USABLE IN HIGH TEMPERATURE FORMATIONS (D#74,285) ABSTRACT OF THE DISCLOSURE Many petroleum formations contain water having excessive quantities of salt or divalent ions such as calcium or magnesium dissolved therein, and are additionally at a temperature from about 70 to about 300°F. Most surfac- tants otherwise usable for oil recovery operations are either ineffective in high salinity or hard water, or decompose or precipitate at the higher temperatures en- countered in formations. A sulfonated, ethoxylated alcohol or alkylphenol surfactant, either as the sole constituent of the surfactant solution, or as a co-surfactant with a more conventional anionic surfactant such as petroleum sulfonate, alkyl sulfonate, or alkylaryl sulfonate, is effective for use in formations containing water having substantial amounts of salt and/or divalent ion salts such as calcium or magnesium dissolved therein, and which additionally may be hotter than 120°F. I
237085
Smart & Biggar
Texaco Development Corporation
LandOfFree
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