“Improved Oil Recovery & EOR using Biological Enzymes”
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EOR Pilot Tests With Modified Enzyme
Feng Qingxian,Wang Juanjuan,Liu Min,et al.(Oil Production and Technology Institute,Dagang Oilfield Company,CNPC,Tianjin 300280,China) In order to verify the enhanced oil recovery effect of modified enzyme,micro and macro evaluations were conducted to understand its EOR mechanisms by using various fluids and conditions. At reservoir temperature of 50 to 80℃,lab experiment indicated that the modified enzyme solution was adaptable to both light and heavy oil and was not sensitive to minerals, water with bivalent cation and high salinity. The enzyme working performances were further enhanced with microorganism occurrence in the solution. Micro modeling experiment revealed that spontaneous emulsification and solubilization could take place between the modified enzyme and crude with emulsion particle of 2 to 6 μm in diameter,which is produced through stripping as a result of solubilization. Core flooding experiments presented that desorbed crude volume and displacement efficiency were related to modified enzyme concentrations which usually ranged from 5% to10% with the optimum being 8%.In optimal conditions,recovery can on averagely be increased by 16.9%.Pilot test was carried out,and had achieved additional oil production of 2,920 t.It shows that the tech has good foreground.
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