| abstract |
The invention relates to the use of zwitterionic geminal liquids of type bis-N-alkyl polyether or bis-N-alkenyl polyether or bis-N-aryl polyether bis-beta imino acids or the salts thereof as modifiers of the wettability of rock, such as limestone, dolomite, sandstone, quartz or heterogeneous lithologies, in the presence of brine having a high concentration of divalent ions, such as calcium, magnesium, barium and strontium, at a high temperature and pressure, in improved oil recovery processes. |