稠油热采无机硅酸凝胶封窜剂的研究与应用  

Research and application of inorganic silicate gel sealer forthermal recovery of thick oil

作　　者：付美龙[1,2] 陈鹏 李毓 陈立峰 刘邹炜 FU Meilong;CHEN Peng;LI Yu;CHEN Lifeng;LIU Zouwei(School of Petroleum Engineering,Yangtze University,Wuhan 430100,Hubei;Hubei Key Laboratory of Drilling and Production Engineering for Oil and Gas(Yangtze University),Wuhan 430100,Hubei)

机构地区：[1]长江大学石油工程学院,湖北武汉430100 [2]油气钻采工程湖北省重点实验室(长江大学),湖北武汉430100

出　　处：《长江大学学报（自然科学版）》2024年第2期67-75,共9页Journal of Yangtze University(Natural Science Edition)

基　　金：国家自然科学基金项目“热敏聚合物纳米流体高温触变机制研究”(52004038)。

摘　　要：在稠油油藏热采过程中容易发生蒸汽地下窜流和地表汽窜,严重影响矿区产能,同时造成地面污染。以水玻璃与尿素为交联剂主体,通过与表面活性剂甘油三乙酸酯进行复配,研制了一种新型耐高温封窜剂。通过正交试验确定了最优封窜剂配方:60%水玻璃+4%尿素+0.2%甘油三乙酸酯+水;红外光谱(FTIR)及扫描电镜(SEM)分析发现,该体系中水玻璃通过一段时间的交联,形成单硅酸,后缩聚形成线性多聚硅酸,硅酸分子间相互作用发生缠结,形成的网状结构使得其稳定性较高,结构更稳定,有更好的耐温能力;实验室内填砂管性能评价结果表明,封窜剂段塞注入量为0.2 PV及候凝时间为5 d时,封堵率98.8%、突破压力梯度1.4 MPa/m、残余阻力系数83.32,经过21 PV 260℃的高温蒸汽冲刷后封堵率稳定在94%以上;现场试验结果表明,井F-109日产油从0.9 t增至5.5 t,含水率由89%降至50%,施工244 d,累计增油1122.4 t,F井区地面不再发生蒸汽窜漏,受地面窜漏影响的14口井恢复了正常注汽吞吐生产,累计增油15713.6 t,平均单井日注汽量100 m 3,注汽压力5.5 MPa。综合表明,该封窜剂体系具有良好的高温选择封堵性,对稠油热采高温蒸汽窜流的有效治理提供了理论指导和技术支撑。In the process of thermal recovery of thick oil reservoir is prone to underground steam fugitive and surface vapor fugitive,which seriously affects the production capacity of the mine and causes surface pollution at the same time.In view of the benefits and environmental impact of these problems,the research of high temperature fugitive sealing agent for thermal recovery of thick oil is carried out.By using water glass and urea as the main cross-linking agent and compounding with surfactant glycerol triacetate,a new type of high-temperature resistant sealer was developed.The optimal formulation of the sealer was determined by orthogonal test as 60%water glass+4%urea+0.2%glycerol triacetate+water.Infrared spectroscopy and scanning electron microscopy analysis revealed that water glass in the system formed monosilicic acid through crosslinking for a period of time,and then condensed to form linear polysilicic acid.The entanglement of silicon acid molecules results in a network structure,which makes it more stable and has better temperature resistance.The experimental results of the performance evaluation of the sand-filled pipe in the laboratory showed that the sealing rate was 98.8%,the breakthrough pressure gradient was 1.4 MPa/m and the residual resistance coefficient was 83.32 when the injection volume of the blocking agent was 0.2 PV and the waiting time was 5 d,and the sealing rate was still stable above 94%after the high temperature steam flushing at 21 PV 260℃,After the field test,the daily oil production of Well F-109 increased from 0.9 d to 5.5 d,and the water content decreased from 89%to 50%,with a cumulative oil increase of 1122.4 t in 244d of construction.steam leakage no longer occurred on the surface of well area F,and the 14 wells affected by surface leakage resumed normal steam injection and throughput production,with a cumulative oil increase of 15713.6 t and an average single well daily steam injection volume of 100 m 3 and steam injection pressure of 5.5 MPa.The comprehensive experimental resu

关 键 词：高温封窜 稠油 提高采收率 表面活性剂 

分 类 号：TE357.4[石油与天然气工程—油气田开发工程]