Effect of Low-Concentration of 1-Pentanol on the Wettability of Petroleum Fluid-Brine-Rock Systems.

摘要: High-concentration brines generally cause the wettability of petroleum fluid-brine-rock systems to become less water-wet (more oil-wet). The addition alcohols brine, however, may produce an opposite effect. In this work, we investigate synergic effects a low concentration 1-pentanol and on systems. variables examined include mineral type (mica, quartz, calcite), brine (0-3 M), ion (monovalent divalent), crude oil (samples from sandstone carbonate reservoirs), (0.5 1 wt %). Adding % only slightly affects fluid sandstone-like surfaces (mica quartz), whereas effect is significant for carbonate-like (calcite). A maximum reduction 80° in contact angle (measured through phase) observed at 0.1 M NaCl 0.5 1-pentanol. ζ-Potentials both brine-petroleum brine-rock interfaces are found be insensitive presence brine. Based these observations, propose that accumulation thin film confined between rock surface results change wettability. Our finding have various practical applications, one which use improving production.