| http://www.w3.org/ns/prov#value | - In the course of designing a surfactant flooding process for use in an oil-containing formation whose temperature is 240??? F., and which formation contains water having a salinity of 205,000 parts per million total dissolved solids including about 10,000 parts per million divalent ions, principally calcium and magnesium, a preferred primary surfactant was identified which was a sodium salt of an
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