生物纳米增注技术在渤海油田中低渗储层的应用  

Application of bio-nano increasing injection technology in medium and low permeability reservoirs of Bohai Oilfield

作　　者：冯青 张凡[2] 王博[2] 李胜胜 陈哲永 李啸南 佘跃惠 FENG Qing;ZHANG Fan;WANG Bo;LI Shengsheng;CHEN Zheyong;LI Xiaonan;SHE Yuehui(Oilfield Production Optimization Institution,China Oilfield Services Limited,Tianjin 300459,China;School of Energy Resources,China University of Geosciences(Beijing),Beijing 100083,China;School of Petroleum Engineering,Yangtze University,Wuhan 430100,China)

机构地区：[1]中海油服油田生产研究院,天津300459 [2]中国地质大学(北京)能源学院,北京100083 [3]长江大学石油工程学院,湖北武汉430100

出　　处：《断块油气田》2025年第1期153-158,176,共7页Fault-Block Oil & Gas Field

基　　金：国家自然科学基金项目“低渗透油田提高原油采收率的生物化学基础研究”(51634008)。

摘　　要：海上油田注入压力高,注水量达不到配注要求,为此研制了生物纳米增注技术,该技术主要由改性纳米颗粒和生物分散剂构成。文中利用红外光谱分析、扫描电镜观察等手段对生物纳米增注体系的分散稳定性、耐受性、粒径分布和改性接枝特性进行了评价。实验结果表明:生物纳米颗粒为疏水性纳米二氧化硅SiO2,不同加量的生物纳米溶液放置12~360 h后,透光率均保持在95%以上;生物纳米体系平均粒径为58.10 nm,Zeta电位维持在-32 mV左右,可抑制地层水矿化度的影响,最高抗矿化度为75 g/L。对生物纳米增注体系注入工艺参数进行了优化,结果表明:纳米溶液最佳加量为10%,最优注入量为3 PV,最佳注入速率为0.50 mL/min。渤海K油田进行了生物纳米增注技术矿场试验,3个月后,目标井作业后储层平均吸水指数由12 m^(3)/(d·MPa)升至30 m^(3)/(d·MPa),中低渗小层启动压力由15.1 MPa降至6.5 MPa,井组累计增注量已达0.9×10^(4) m^(3)。该研究为解决海上中低渗油藏注水困难以及保证油田发展提供了新技术、新思路。The injection pressure of offshore oil field is high,and the injection water can not meet the injection requirement.Therefore,the bio-nano injection technology is developed,the technology mainly consists of modified nano-particles and biological dispersants.The dispersion stability,tolerability,particle size distribution and modified grafting characteristics of the bio-nano injection system were evaluated by infrared spectroscopy and scanning electron microscopy.The experimental results show that the bio-nano particles are hydrophobic nano-SiO2,and the light-transmittance of bio-nano solutions with different concentrations is above 95%after being placed for 12-360 h.The average particle size of the bion-nano system is 58.10 nm,and the Zeta potential is maintained at about-32 mV,which can inhibit the influence of formation water salinity,and the highest salinity resistance is 75 g/L.The injection technological parameters of the bio-nano injection system were optimized,and the results showed that:the optimal injection concentration of nano-solution was 0.5‰,the optimal injection volume was 3 PV,and the optimal injection flow rate was 0.50 mL/min.The field test of bio-nano increasing injection technology was carried out in K Oilfield,Bohai.Three months later,the average reservoir water absorption index after the operation of the target well increased from 12 m^(3)/(d·MPa)to 30 m^(3)/(d·MPa),the starting pressure of the medium and low permeability small layer decreased from 15.1 MPa to 6.5 MPa,and the cumulative injection volume of the well group has reached 0.9×10^(4) m^(3).This study provides a new technique and a new idea for solving the difficulty of water injection in offshore medium and low permeability reservoirs and ensuring the development of oilfields.

关 键 词：中低渗储层 生物纳米 增注体系 现场试验 渤海油田 

分 类 号：TE348[石油与天然气工程—油气田开发工程]