整体微生物驱油技术在宝力格油田规模化应用研究
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摘要
根据宝力格油田巴19断块地质条件、水驱开发特点及目前稳产存在的问题,华北油田公司通过在该断块建立稳定微生物场来实现整体微生物循环驱。实验首先从目标油藏筛选出4株高效采油菌,室内研究表明这四种茵不但能够很好地适应油藏环境,而且对原油具有很好的降黏乳化效果。气相色谱分析表明所筛选茵种能够以原油为碳源,有效降解长链烃,尤其将这4株茵按等比例复配后效果更佳,降黏率达52.8%,在水驱(采收率49.5%)的基础上,物模驱油提高采收率为9.1%。33口注水井进行两轮次的微生物驱后地层中的茵液浓度普遍在10~5～10~6个/mL之间,注入的目标茵得到有效生长和繁殖,并且能够维持8个月以上。微生物驱后含水率被控制在85%以下,采收率明显提高,12个月累计增油15000 t,投入产出比达到1:2.5。该研究为微生物采油技术现场应用提供宝贵经验。
Based on the geological conditions,Water flooding characteristic and the current difficult of stable yield of Ba-19 fault block,Huabei Oilfield Company have employed the overall microbial circulating oil displacement technology by established stable microbial field in this block.Firstly,four strains of efficient production microbes were screened from target reservoir.The laboratory study indicated that the four kinds of microbes could not only well adapted to the reservoir environment,but also had the good viscosity reduction and emulsifying effect for crude oil.The gas chromatography(GC) analysis showed that the screened strains could use the crude oil as carbon source,and degrade long-chain hydrocarbons effectively.Especially by compounded these microbes according to equal proportions,the viscosity reduction rate reached up to 52.8%,and based on 49.5%oil recovery of the water flooding,the oil recovery was enhanced by 9.1%by physical model experiment.The microbial concentration in target reservoir reached 10~5—10~6 cells/mL and maintained over 8 months.The results demonstrated that the injected target microbes could grow and reproduce effectively in reservoir.The water cut was controlled lower than 85%and the oil recovery improved obviously.The cumulative incremental oil was 150001 within 12 months,and the input-output ratio was up to 1:2.5.
Based on the geological conditions,Water flooding characteristic and the current difficult of stable yield of Ba-19 fault block,Huabei Oilfield Company have employed the overall microbial circulating oil displacement technology by established stable microbial field in this block.Firstly,four strains of efficient production microbes were screened from target reservoir.The laboratory study indicated that the four kinds of microbes could not only well adapted to the reservoir environment,but also had the good viscosity reduction and emulsifying effect for crude oil.The gas chromatography(GC) analysis showed that the screened strains could use the crude oil as carbon source,and degrade long-chain hydrocarbons effectively.Especially by compounded these microbes according to equal proportions,the viscosity reduction rate reached up to 52.8%,and based on 49.5%oil recovery of the water flooding,the oil recovery was enhanced by 9.1%by physical model experiment.The microbial concentration in target reservoir reached 10~5—10~6 cells/mL and maintained over 8 months.The results demonstrated that the injected target microbes could grow and reproduce effectively in reservoir.The water cut was controlled lower than 85%and the oil recovery improved obviously.The cumulative incremental oil was 150001 within 12 months,and the input-output ratio was up to 1:2.5.
引文
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[2]Song Z Y,Guo L Y,Qu Y Y,et al.Microbial surfactant-enhanced mineral oil recovery under laboratory conditions[J].Colloid Surface B:Biointerf,2008,63(l):73-82.
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[4]杨凌,王世建.川北油田微生物吞吐采油技术研究[J].内蒙古石油化工,2009,6:45-49.
[5]汪卫东,魏斌,谭云贤,等.微生物采油需要进一步解决的问题[J].石油勘探与开发,2004,6:152-156.
[6]汪卫东.微生物采油技术研究及试验[J].石油钻采工艺, 2012,34(1):107-113.
[7]Amani H,Sarrafzadeh M H,Haghighi M,et al.Comparative study of biosurfactant producing bacteria in MEOR application [J].J Petrol Sci Eng,2010,75(1-2):209-214.