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《Journal of Central South University(Science and Technology)》 2009-01
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Interaction between cationic surfactants and acids in crude oil and wettability alternation

YAO Tong-yu1,LI Ji-shan2 (1. College of Petroleum Engineering,China University of Petroleum,Dongying 257061,China; 2. Geological Scientific Research Institute,Shengli Oilfield Company Ltd,Dongying 257015,China)  
Phys-chemical interactions between CTAB molecules and acids in crude oil were analyzed in surfactant mass transfer system. Partition and mass transfer performance of CTAB from water to oil was studied as a function of pH and concentration of surfactant and the acid number of crude oil. Meanwhile the contribution of mass transfer on the wettability alternation of carbonate was also studied. The experiments show that ion-pairs between carboxylic acids in oil phase and the cationic surfactant favor mass transfer and partition of CTAB into oil phase,and the mass transfer and partition improve as the pH of the surfactants increases. Ion-pairs of CTAB-carboxylic acid groups in crude oil is nucleophilic to oil wet surface,so its partition in oil leads to wettability alternation of pores surface in carbonate rocks,from oil wet to water wet. The micelles of surfactant in water accelerate desorbing of carboxylic groups from surface,so wettability alternation is more efficient when surfactant concentrations is higher than that of CMC.
【Fund】: 国家重点基础研究发展计划资助项目(2005CB221304)
【CateGory Index】: TE357.46
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