薄层砂岩边底水油藏空气辅助内源微生物驱油技术  

Air-assisted microbial enhanced oil displacement in Thin Sandstone Reservoir with Edge and Bottom Water

作　　者：刘晓丽 李阳[1] 白雷 吴丛文 王红波[2] 马挺[3] 姜振学[1] 万云洋[1] Liu Xiaoli;Li Yang;Bai Lei;Wu Congwen;Wang Hongbo;Ma Ting;Jiang Zhenxue;Wan Yunyang(China University of Petroleum(Beijing),Beijing 102249,China;PetroChina Xinjiang Oilfield Company,Karamay,Xinjiang 834000,China;Nankai University,Tianjin 300071,China)

机构地区：[1]中国石油大学(北京),北京102249 [2]中国石油新疆油田分公司,新疆克拉玛依834000 [3]南开大学,天津300071

出　　处：《特种油气藏》2024年第2期103-111,共9页Special Oil & Gas Reservoirs

基　　金：国家自然科学基金项目“新疆砾岩油藏采油功能菌运移代谢规律及其驱油机理研究”(U2003128)。

摘　　要：针对边底水油藏“双高阶段”零散分布剩余油如何有效动用、低成本高效微生物驱油体系如何研发、微生物驱效果评价及配套技术攻关等难题,建立微生物驱筛选图版并评价了油藏微生物驱的适应性;利用微生物分子生态学技术全面解析了油藏微生物群落结构,筛选了乳化效果好的采油功能菌株H3;通过对主要营养成分碳源、氮源、磷源的筛选,开展单因素实验和正交实验,确定了可实现原油乳化分散和抑制硫酸盐还原菌生长的复合粉激活体系;研究了底水油层“船底形”剩余油富集特征,形成了“微生物乳化+空气提效+稠化剂封堵”提高采收率驱油模式,明确了提高采收率幅度与注入菌体浓度、注入孔隙体积倍数正相关。将研究成果应用于准噶尔盆地陆梁油田薄层砂岩边底水油藏,实施“4注20采”微生物驱提高采收率矿场先导试验,注入微生物激活剂0.13倍孔隙体积,2017至2023年阶段增油5.6×104 t,采收率提高4.0个百分点,增油效果好的井主要分布在总菌浓度高、石油地质储量大、构造高部位、油层厚度大、底水薄、采出程度较高的区域。研究成果对丰富微生物驱提高采收率技术序列具有借鉴作用。Considering the challenges associated with effectively producing scattered residual oil in reservoirs with edge and bottom water during the“dual high-stage of high degree of reserve recovery and high water cut”,as well as developing a cost-effective and efficient microbial oil displacement system,evaluating the effectiveness of microbial flooding,and identifying key supporting technologies,this study establishes a screening chart for microbial flooding and evaluates its adaptability.The microbial community structure of the reservoir was comprehensively analyzed using microbial molecular ecology technology,and strain H3 with excellent emulsifying effect for oil recovery was screened.Through screening of key nutrients including carbon source,nitrogen source,and phosphorus source,single-factor experiments and orthogonal experiments were conducted to determine a composite powder activation system capable of achieving emulsification dispersion of crude oil while inhibiting the growth of sulfate reducing bacteria.The enrichment characteristics of residual oil of"ship bottom type"in bottom water reservoir were investigated,and a microbial emulsification+air efficiency improvement+thickener plugging EOR mode was developed.It was found that the enhanced oil recovery had a positive correlation with both the injection concentration of bacteria and the injection volume multiple.The research findings were applied to the thin sandstone reservoir with edge and bottom water of Luliang Oilfield in Junggar Basin.A pilot test was conducted to enhance recovery through"4 injectors and 20 producers"microbial flooding pattern.The microbial activator was injected at a rate of 0.13 times the pore volume.From 2017 to 2023,there was an increase in oil production by 5.6×104 t,resulting in a rise of the recovery rate by 4.0 percentage points.It is evident that wells with significant improvement of oil production are primarily located in areas characterized by with high total bacterial concentration,large geological reserves,high structu

关 键 词：内源微生物驱 边底水油藏 剩余油 激活体系 采收率 准噶尔盆地 陆梁油田 

分 类 号：TE349[石油与天然气工程—油气田开发工程]