Lab Studies of MEOR Strains Optimization for High Salinity Reservoirs
.Aiming at the high salinity at low-permeability reservoirs, a strain named S-4 that can yield a kind of bio-surfactants was screened from the produced water of oil wells in use of the Hemolysis of the bio-surfactants and its characteristics of making the color of blue gel plate change in its formation process. The laboratory results show that the surface tension of the strains fermentation liquor becomes less than 30mN/m after cultured by crude oil as the carbon source, and it would remain at the value of 31mN/m even if the concentration becomes a half; this bio-surfactant keeps stable when the salinity is in the range of 4000mg/L～50000mg/L; In physical experiments the strains can improve crude oil recovery ratio by 4% which shows a good oil displacement effect.
J. C. Wu et al., "Lab Studies of MEOR Strains Optimization for High Salinity Reservoirs", Advanced Materials Research, Vols. 343-344, pp. 844-848, 2012