Yuliani, Bambang Yudono, Eddy Ibrahim and Hary Widjajanti
Abstract
The Microbial Enhanced Oil Recovery process using several bacteria or consortium of bacteria is a potential method of obtaining crude oil in a reservoir. Biosurfactants as secondary metabolites of consortium I bacteria (Bhurkholderiaglumae, Pseudomonas fluorescence, Pseudomonas citronellolis) and consortium II bacteria (Bhurkholderiaglumae, Pseudomonas peli, Pseudomonas citronellolis) with time variations of ultrasonic, NaCl and pH in a temperature range of 70 °C and 90 °C is applied to recover oil. The sonication process uses digital ultrasound at 20 kHz. The best results were obtained from the results of oil recovery at 2 minutes of ultrasonic transmission, 6% NaCl, and pH 7 for consortium I bacteria (59.28%). The best temperature was 70 °C for consortium II bacteria (52.76%). Consortium bacteria in ultrasonic wave emission have the potential to increase oil recovery.