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ENGINEERING JOURNAL CHIANG MAI UNIVERSITY


Volume 26, No. 02, Month AUGUST, Year 2019, Pages 131 - 146


The effects of cation ratios on ion exchange mechanism of low salinity waterflooding in sandstone reservoirs

Chanapol Charoentanaworakun and Falan Srisuriyachai


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This research presents about the effect of ion interference among sodium ion, potassium ion, calcium ion and magnesium ion on the oil recovery mechanism, which is the exchange between ions in displaced brine and ions adsorbed on sandstone surface. The experiment is performed by varying proportions of cations in the displacing brine into 5 ratios, i.e. 1:0, 4:1, 1:1, 1:4, and 0:1, and measuring the recovered oil amount from the different brine formulas. The result shows that when the concentration ratio between calcium ion and magnesium ion is 1:1, the highest oil recovery of 45.25% is obtained due to the least linkage between oil and divalent cations at the sandstone surface Meanwhile, the brine with the ratio between sodium ion and potassium ion of 1:1 can displace the highest quantity of oil at the recovery factor of 40.11% due to the smallest impact from the limitation of each monovalent cation adsorption, which results in the greatest cation exchange mechanism. Moreover, it can be found that the ratio between sodium ion and calcium ion of 4:1 in the displacing brine will establish good effectiveness of both ion exchange mechanism and carboxylate complex reaction, therefore it can yield the highest value of oil recovery at 38.38%


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ENGINEERING JOURNAL CHIANG MAI UNIVERSITY


Published by : Faculty of Engineering Chiang Mai University
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