USING LINEAR ALKYL BENZENE SULFONATE TO REDUCE INTERFACIAL TENSION OF CRUDE OIL
Keywords:
Linear alkyl benzene sulfonate, Interfacial tension, Surfactant, Crude oil, Sansai oil fieldAbstract
Interfacial tension (IFT) is one of the main causes of crude oil movement obstruction in oil reservoirs. To enhance oil recovery, a reduction in crude oil interfacial tension is needed. This research aimed to study the reduction of interfacial tension by adding a surfactant solution into crude oil. Linear alkyl benzene sulfonate (LAS) was selected to use as an IFT reducing additive. The effects of the LAS concentration (5%, 10%, and 15% of concentration by volume) and temperature(40oC-90oC) on IFT of crude oil samples from the Sansai oil field, located in the Fang basin, were measured by the ring and plate method based on the ASTM D971-99 standard. As a result, it was found that a maximum reduction of 20% crude oil IFT occurred after adding the LAS solution at10% by volume at 70oC. IFT was decreased from 26.53 dynes/cm to 21.1 dynes/cm.
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