| 摘要 |
<p>Polyalkyl aromatic sulfonates; and particularly dialklaromatic sulfonates, useful as surfactants in steam recovery methods for enhancing oil recovery from subterranean formations, have been found to comprise essentially mixtures of meta- and para-isomers obtaind by alkylating alkylaromatics, where the alkyl group has from 1 to 4 carbon atoms, with a C14-24 olefin. It has further been found that when the ratio of para-isomer to meta-isomer is increased in this mixture, a significantly more hydrolytically, thermally stable surfactant under steam recovery operating conditions in obtained.</p> |
