稠油热采后内源微生物吞吐实验研究及矿场应用  

Experimental study and field application of endogenous microbial huff and puffafter heavy oil thermal recovery

作　　者：高超 崔伟 严峰[3] 谢向东 刘臻 郭子棋 GAO Chao;CUIWei;YAN Feng;XIE Xiangdong;LIU Zhen;GUO Ziqi(Academy of Science&Technology,China University of Petroleum(East China),Dongying 257000,China;Shengli Think Petroleum Technology Development(Shandong)Co.,Ltd.,Dongying 257000,China;School of Chemistry,Tiangong University,Tianjin 300387,China;Gudao Oil Production Plant of Shengli Oilfield Company,SINOPEC,Dongying 257000,China)

机构地区：[1]中国石油大学(华东)东营科学技术研究院,山东东营257000 [2]胜利星科石油技术开发(山东)有限公司,山东东营257000 [3]天津工业大学化学学院,天津300387 [4]中国石化胜利油田孤岛采油厂,山东东营257000

出　　处：《复杂油气藏》2024年第4期438-443,共6页Complex Hydrocarbon Reservoirs

基　　金：国家自然科学基金(E0403-50804041);天津市自然科学基金面上项目(18JCYBJC89300)资助。

摘　　要：针对稠油热采后继续挖潜剩余油、提高采收率难的问题,以胜利油田孤岛南区馆陶组Ng5-6油藏为例,进行了稠油热采后内源微生物冷采吞吐室内实验研究及矿场应用。实验研究表明:稠油热采后油藏地层微生物群体主要以芽孢杆菌和假单胞菌为主;采用正交试验方法优化激活剂配方,确定碳源、氮源、磷源的比例分别为可溶性淀粉1.0%、硝酸钾0.2%、磷酸氢二钾0.05%,激活后菌浓主体保持在5×10^(8)个/mL^(-1)以上;激活后的代谢物可以有效降低原油黏度,降黏率达到90%以上;可以有效降低油水界面张力,界面张力可以降到0.027 mN/m。矿场应用后,日产量由措施前的1.75 t增加到6.7t;含水率由措施前的96.8%下降到78.5%;措施有效天数达640 d,累产油1 936 t,阶段增油量1 012 t;按照油价2 350元/t计算,投入产出比高达1∶21.6。In response to the difficulty of further tapping the remaining oil and improving the oil recovery rate after heavy oil thermal recovery,taking the Ng5-6 oil reservoir in the Gudao southern area of Shengli Oilfield as an example,an indoor experimental study and field application of endogenous microbial cold production huff and puff after heavy oil thermal recovery were conducted.Experimental studies have shown that the microbial community in the reservoir formation after heavy oil thermal recovery is mainly composed of Bacillus and Pseudomonas;Using orthogonal experimental method to optimize the activator formula,the proportions of carbon source,nitrogen source,and phosphorus source were determined to be 1.0%soluble starch,0.2%potassium nitrate,and 0.05%potassium dihydrogen phosphate.After activation,the bacterial concentration remained above 5×10^(8) cells/mL;The activated metabolites can effectively reduce the viscosity of crude oil,with a viscosity reduction rate of over 90%.It can effectively reduce the interfacial tension between oil and water,and the interfacial tension can be reduced to 0.027 mN/m.After application in the field,the daily production increased from 1.75 t/d before the measures to 6.7 t/d.The water cut decreased from 96.8%before the measures to 78.5%.The effective period of the measures is 640 days,with an accumulated oil production of 1,936 tons and a staged increase in oil production of 1,012 tons.According to the oil price of 2,350 yuan/t,the input-output ratio is as high as 1∶21.6.

关 键 词：稠油热采 内源微生物 冷采吞吐 提高采收率 矿场应用 

分 类 号：TE357.4[石油与天然气工程—油气田开发工程]