胜利油田孤岛中一区Ng3 微生物驱油现场试验效果

Effect of Microbial Enhanced Oil Recovery in Ng3 Block of Gudao Reservior of Shengli Oilfiled

马波 刘涛 曹功泽 王业超 巴燕 曹嫣镔

MA Bo LIU Tao CAO Gongze WANG Yechao BAYan CAO Yanbin

为研究聚合物驱后微生物驱油效果，在胜利油田孤岛中一区Ng3 开展了聚合物驱后微生物驱油试验，现场通过注入高分子多糖类激活剂体系激活油藏深部微生物，从而启动地下残余油，增加原油流动性，提高原油采收率。现场试验表明，小分子酸是微生物代谢重要的指示剂，施工后30 d 出现峰值，且峰值浓度比试验前提高5～8 倍；生物指标检测表明注入激活剂以后微生物得到有效激活，微生物群落多样性降低，现场样品菌浓达到105个/mL以上，而且菌数开始升高的时间滞后于小分子酸，菌数开始升高时小分子酸浓度呈逐渐下降的趋势，这反映了油藏深部厌氧微生物开始生长代谢消耗小分子酸的过程。现场生产动态表明试验以后50 d 开始见效，中心井组综合含水下降2%以上，日增产原油6 t 以上，且效果维持在5 个月以上；其中，中心见效井7XNB11 日产油量由试验前的1.1 t升高到4.5 t，含水率下降6%。图5 表2参14

In order to study the effect of microbial flooding after polymer flooding in Shengli oilfield，the pilot microbial flooding was conducted in Ng3 block of Gudao reservior. The high molecular polysaccharide activator system was injected，so that the microorganism in deep reservoir could be activated，and then the residual oil could be displaced. The filed test results indicated that the low-molecular-weight acids were an important indicator of the microbial metabolic activity. The concentration of the low-molecular-weight acids reached up to the peak value after 30 days after injection，moreover the concentration increased by 5—8 times compared to that before trial. The biological monitoring results indicated that the microbe were activated，the density was up to 105cell/mL，meanwhile，the time of the microbe increased lagged to that of low-molecular-weight acids，and the concentration of the low-molecular-weight acids began to decrease when the microbial density rose， which demonstrated that the low-molecular-weight acids was consumed by the anaerobic bacteria，in addition，the analysis indicated that the species of microorganism in the recovery were reduced by the molecular biology，and more important functional microorganisms were becoming dominant species. The well dynamical analysis indicated that the center well had the desired effect after 50 days，and the water cut decreased by 2%，the oil increased by 6 t/day，and the effects lasted more than 5 months. the oil of the center well 7XNB11 increased from 1.1 t/day to 4.5 t/day，the water ratio decreased over 6%.

10.19346/j.cnki.1000-4092.2016.04.032