Wells – Processes – Distinct – separate injection and producing wells
Patent
1977-04-11
1978-10-17
Guynn, Herbert B.
Wells
Processes
Distinct, separate injection and producing wells
252 855D, E21B 4322
Patent
active
041203585
ABSTRACT:
Disclosed is a surfactant fluid employing two or more surfactants, one anionic and one or more non-ionic surfactant containing two or more polyethoxy chains such as dipolyethoxylated alkylcatechols or dipolyethoxylated primary alkylamines and a process using the fluid for recovering oil from formations which also contain water having high salinities, e.g., salinities greater than about 40,000 parts per million, and which may include high concentrations of divalent ions such as calcium and/or magnesium, e.g., greater than about 3,000 parts per million calcium and magnesium. Nonionic surfactants having two or more polyethoxy chains have substantially higher cloud points than corresponding nonionic surfactants with similar oil soluble groups and the same number of ethoxy groups in a single chain. Superior results are obtained if the nonionic surfactant is chosen to have a cloud point from 20.degree. F to 80.degree. F above the formation temperature.
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Schick, Nonionic Surfactants, vol. 1, pub. 1967 by Marcel Dekker, Inc., New York, pp. 187, 188 and 197-199.
Guynn Herbert B.
Park Jack H.
Ries Carl G.
Texaco Inc.
Whaley Thomas H.
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