改性生物酶驱油先导试验

EOR pilot tests with modified enzyme

冯庆贤 汪娟娟 柳敏 李辉 赵冬云 梁建春 滕克孟

大港油田公司采油工艺研究院，天津 300280 大港油田公司第五采油厂，天津 300280

为验证改性生物酶的增采效果，应用不同性质流体在不同温度下对生物酶增采机理进行了微观和宏观试验研究。结果表明，生物酶适用于稀油和稠油，对金属二价阳离子和高矿化度水不敏感，最佳应用浓度为8％，本源微生物的存在对其效果有促进作用。微观模型证明，酶和原油可发生自发乳化和增溶作用，形成直径为2～6 μm的乳状液颗粒。岩心驱替试验结果表明，在一定浓度范围内，驱油效率随酶浓度提高而增加，最佳条件下采收率较水驱平均提高16.9％。应用改性生物酶进行了现场驱油先导试验，阶段已增油2 920 t，具有广阔的应用前景。

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.