改性生物酶驱油先导试验.pdf

断 块 油 气 田 第 15卷第4期 FAUI —BLOCK 0IL＆GAS FIELD 2008年 7月 文章编号：1005-8907(2008)02-083-04 改性生物酶驱油先导试验 冯庆贤 汪娟娟 柳 敏 李 辉 赵冬云 梁建春 滕克孟 (1．大港油田公司采油工艺研究院，天津 300280；2．大港油田公司第五采油厂，天津 300280) 摘 要 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 Ixm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 920t．具有广阔的应用前景。 关键词 改性生物酶；机理研究；钙离子；镁离子；微观实验；现场试验；效果评价 中图分类号：TE357．12．TQ924．9 文献标识码：A EOR pilot tests with modified enzyme Feng Qingxian(Oil Production and Technology Institute，Dagang Oilfield Company，CNPC，Tianjin 300280，China)， Wang Juanjuan，Liu Min，et a1． In order to verify the enhanced oil recovery effect O f 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~C，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 enzynle 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 Ixm in diameter,which is produced through stripping as a result of solubilization．Core flooding experiments presented that desorbed crude volume and displacement efficiency were