| 摘要 |
1521575 Oil recovery MARATHON OIL CO 22 June 1976 [11 Aug 1975] 25906/76 Heading E1F A process for recovering oil comprises injecting into a subterranean formation a micellar dispersion including a hydrocarbon, surfactant, water and a cosurfactant, the latter being in sufficient-concentration and having sufficient hydrophilic properties to allow the dispersion to solubilize none or a minimum of the connate water within the dispersion or to allow a minimum dehydration of water from the dispersion by the connate water upon initial contact with the connate water. Preferably the dispersion comprises 4-20% by volume surfactant, 4-56% by volume hydrocarbon, 40-92% by volume water, 0.01-20% volume cosurfactant and 0.001-10% by volume electrolyte. The surfactant may be anionic, cationic, nonionic or mixtures thereof and is preferably a petroleum sulphonate. The hydrocarbon may be crude oil, a fraction thereof, unreacted vehicle oil within the surfactant, synthesised hydrocarbons, or mixtures thereof; and the electrolyte may be water-soluble inorganic salts, inorganic bases, inorganic acids, or mixtures thereof and is preferable ammonium sulphate or sulphite, or sodium, sulphate or sulphite. The cosurfactant may be an amide, amino compound, ester, aldehyde or ketone, and is preferably an alcohol. |
