随着油田开发的不断深入,油井堵塞等储层伤害问题愈发严重,导致油井产量下降甚至停产.为有效提高石油开采效率,基于微生物菌体及其代谢产物的协同作用,选用具有解堵和驱油能力的菌株KC(Bacillus subtilis)、DY(Bacillus licheniformis)、DN1(Pseudomonas aeruginosa)及其代谢产物等进行复配而形成具有解堵、阻垢、缓蚀和驱油性能的3种增效解堵体系A、B和C.采用油水界面张力确定菌剂配比,通过垢物溶蚀、CaCO3沉积、静态腐蚀、乳化指数测定和岩心驱替等室内实验进行体系性能评价,并将其用于现场试验.结果表明:增效解堵体系C对有机垢、无机垢和复合垢的溶蚀效率均在80％以上,阻垢率为95.50％,缓蚀率达61.44％,提高驱油效率14.58％.现场试验也证实体系C具有显著的增油效果,2 口措施井平均单井日增油0.57 t.
Performance evaluation and application of microbial removal-inhibition-intensify synergistic plug removal system
Reservoir damage has become a serious problem due to the exploitation of petroleum,resulting in production decline or even production suspension of oil.Based on the synergistic action of microbial bodies and their metabolites,three strains KC(Bacillus subtilis),DY(Bacillus licheniformis)and DN1(Pseudomonas aeruginosa),as well as their metabolites,were selected to generate three synergistic plug removal systems(A,B,C),which could improve the efficiency of oil production through combined effects from plug removal,scale and corrosion inhibition,and oil displacement.The proportion of fermentation broth was optimized by measurement of oil-water interfacial tension,and three synergistic plug removal systems were evaluated according to laboratory experiments and field tests.The laboratory experiments showed that the synergistic plug removal system C could remove＞80％of plug,inhibit 95.5％of CaCO3 deposit,mitigate 61.44％of corrosion,and improve oil displacement efficiency by 14.58％.Field test further confirmed the best performance of system C,which could boost oil production by 0.57 t/d on average.
oil well depositmicrobial consortiaplug removalscale inhibitionenhanced oil recoveryreservoir microorganism
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