摘要
封堵低渗透油藏的多尺度水窜通道是提升这类油藏水驱开发效果的关键,开发了一种内源微生物堵剂,优化了其菌种发酵营养液配方,并基于室内静态实验表征了其基础物性,最后通过岩心动态实验评价了其封堵适应性。所优化的菌种发酵营养液配方为:1.0%~2.0%糖蜜+0.2%~1.0%硝酸钠+0.5%~2.0%磷酸二氢钾+0.2%~1.0%磷酸氢二钠+0.1%~0.5%硫酸铵+0.01%~0.1%工业酵母膏+0.01%~0.03%硫酸铁+0.01%~0.03%硫酸锰。在营养液中培养4 d后,微生物趋于稳定,形成的分散颗粒呈正态分布,粒径集中在40~160μm之间,粒度中值在90μm左右,且具有良好的抗剪切性、耐盐性及稳定性。初始态的微生物调堵剂能顺利进入低渗透岩心、非均质岩心和裂缝性岩心。进入岩心后,微生物基于其自生长特性与孔隙及裂缝介质匹配,对渗透率为5×10^(-3)μm^(2)的岩心的封堵率达到80%;对渗透率为5×10^(-3)/100×10^(-3)μm^(2)的非均质岩心的封堵率达92%;对渗透率为5×10^(-3)/300×10^(-3)μm^(2)的非均质岩心的封堵率达95%。微生物堵剂对开度为30μm的裂缝性岩心的封堵率达84%;对开度为80μm的裂缝性岩心的封堵率接近90%。微生物堵剂既可以封堵不同尺度的多孔介质水窜通道,又可以封堵不同尺度的微裂缝水窜通道,具备封堵低渗透油田多尺度水窜通道的潜力。
The key to improve the effect of water flooding development of low permeability reservoir is to solve the problem of multi-scale water channeling in low permeability oil fields.An endogenous microbial plugging agent was developed and the formula of the fermentation nutrient solution for the plugging agent has been optimized.Subsequently,the basic physical properties of the plugging agent were characterized through indoor static experiments and the plugging adaptabilities of the plugging agent were evaluated through dynamic core experiments.The fermentation nutrient solution of the strain was consisted of 1.0%—2.0%molasses,0.2%—1.0%sodium nitrate,0.5%—2.0%potassium dihydrogen phosphate,0.2%—1.0%disodium hydrogen phosphate,0.1%—0.5%ammonium sulfate,0.01%—0.1%industrial yeast extract,0.01%—0.03%ferric sulfate and 0.01%—0.03%manganese sulfate.After cultivation in the fermentation nutrient solution for 4 days,the growth of microbial strains stabilized.The formed dispersed particles exhibited a normal distribution with particle sizes of 40—160μm and a median granularity of about 90μm.The prepared microbial plugging agent had good shear resistance,salt resistance and stability.The initial state of microbial plugging agent could be injected into the low-permeability core,heterogeneous core and fractured core with good injectivity.The microbial strains could grow and reproduce in the cores based on the characteristics of self-growth,and match with the spatial scale of pore media or fracture media,which could not only plug the porous medium with different scales,but also plug the micro-fractures with different scales.The plugging rate of the core with a permeability of 5×10^(-3)μm^(2) reached up to 80%.As for the heterogeneous parallel composite cores with the permeability of 5×10^(-3)/100×10^(-3)μm^(2) and 5×10^(-3)/300×10^(-3)μm^(2),the plugging rate reached up to 92%and 95%,respectively.For the fractured cores with an opening of 30μm and 80μm,the plugging rate reached up to 84%and 90%,respectively.The microbial plugging agents could plug both porous medium with the different scales and micro fractures with the different scales based on the characteristics of self-growth,thus possessing the potential to plug the multi-scale water channeling in low-permeability oil reservoir.
作者
倪军
王维波
王成俊
张磊
李成勇
NI Jun;WANG Weibo;WANG Chengjun;ZHANG Lei;LI Chengyong(Shaanxi Yanchang Petroleum(Group)Company,Ltd,Xi’an,Shaanxi 710075,P R of China;Research Institute of Shaanxi Yanchang Petroleum(Group)Company,Ltd,Xi’an,Shaanxi 710075,P R of China;College of Chemistry and Chemical Engineering,Xi'an Shiyou University,Xi’an,Shaanxi 710065,P R of China;Department of Petroleum Engineering,Key Laboratory of Theory and Technology of Petroleum Exploration and Development in Hubei Province,China University of Geosciences(Wuhan),Wuhan,Hubei 430074,P R of China)
出处
《油田化学》
CAS
CSCD
北大核心
2024年第3期431-437,共7页
Oilfield Chemistry
基金
国家自然科学基金“基于微观流变力学原理的单个凝胶微球长期变形与运移机制研究”(项目编号52204054)
陕西省创新能力支撑计划“非常规油藏低碳环保提高采收率技术创新团队”(项目编号2023-CX-TD-31)。
关键词
低渗透油田
多尺度水窜
微生物调堵剂
自生长
注入性
low permeability oil field
multi scale water channeling
microbial plugging agent
self-growth
injectivity
作者简介
倪军(1981-),男,教授级高级工程师,西北大学油气田地质与开发专业博士(2012),从事油气田开发的科研与管理,E-mail:56483122@qq.com。;通讯联系人:张磊(1987-),男,副教授,中国石油大学(华东)油气田开发工程专业博士(2017),从事提高采收率、采油化学的教学与科研工作,通讯地址:430074湖北武汉洪山区鲁磨路388号文华楼116室,E-mail:zhangshishishi.188@163.com。
