E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
31/16
E21B 43/22 (2006.01) E21B 43/24 (2006.01) C09K 7/02 (1980.01)
Patent
CA 1096153
SURFACTANT OIL RECOVERY PROCESS USABLE IN HIGH TEMPERATURE, HIGH SALINITY FORMATIONS (D#74,285-1-F) ABSTRACT OF THE DISCLOSURE Many petroleum formations contain water having high salinity and/or high concentrations of divalent ions such as calcium or magnesium dissolved therein, and are additionally at temperature from about 70°F. to about 300°F. Most surfactants suitable for use in oil recovery operations are either ineffective in high salinity or high hardness waters, or cannot tolerate the higher temperatures en- countered in many such formations. An aqueous fluid con- taining a water soluble alkylpolyalkoxyalkyl sulfonate or alkylarylpolyalkoxyalkyl sulfonate and a water-insoluble polyethoxylated aliphatic alcohol or polyethoxylated al- kylphenol nonionic surfactant is effective in formations containing water whose salinity is from 70,000 to 220,000 parts per million total dissolved solids and also having temperatures as high as 300°F. The fluid is phase stable over a wide range of formation temperatures and water sa- linities and hardness values.
296834
Maddox Jim Jr.
Shupe Russell D.
Gowling Lafleur Henderson Llp
Texaco Development Corporation
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