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Solid wettability after surfactant acting
SUN Lin1,PU Wan-fen1,WU Ya-li2,XIN Jun3
(1. School of Petroleum Engineering in Southwest Petroleum University,Chengdu 610500, China;2.CNOOC Energy Development Oil Technical Services Company,Tianjin 300452, China ;3. Geological Exploration and Development Research Institute, CNPC Chuanqing Drilling Engineering Company,Chengdu 610051, China)
Abstract:
By measuring the contact angle of oil/water/glass slide that has been soaked in petroleum sulfonate( PS),as well as examining the surface topography of mica which also has been soaked by petroleum sulfonate, the solid wettability after surfactant acting was researched. The results show that, for hydrophilic solid,after being soaked in low concentration PS solution, its wettability alternates due to the adsorption of PS monomolecule layer on its surface. However, after being soaked in high concentration PS solution, its wettability keeps water-wet due to the adsorption of PS bilayer on its surface. Meanwhile ,the time for hydrophilic solid reaching stable wettability shortens with elevated PS temperature. For hydrophobic solid, after being soaked in low temperature high concentration PS solution, its wettability rarely improves. However, after being soaked in high temperature low concentration PS solution,its wettability improves easily due to the desorption of oil-wet materials from its surface. But if the solid is soaked any more,its wettability will alternate again due to the adsorption of PS monomolecule layer on the new solid surface. Consequently, it demands comprehensive consideration about the surfactant concentration ,temperature and action time to effectively use surfactant improving wettability.
Key words:  surfactant  wettability alteration  adsorption  desorption  surface topography