基于分子动力学模拟技术的纳米乳液解水锁剂优化研究  

Optimization Study on Nano-emulsion Water Unlocking Agent Based on Molecular Dynamics Simulation Technique

作　　者：李明昊 韩佳寰 李耀年 刘炳霈 李浩天 汪杰[1,2,3] LI Minghao;HAN Jiahuan;LI Yaonian;LIU Bingpei;LI Haotian;WANG Jie(Cooperative Innovation Center of Unconventional Oil and Gas,Yangtze University,Wuhan 430074,China;School of Petroleum Engineering,Yangtze University,Wuhan 430074,China;Hubei Key Laboratory of Drilling and Production Engineering for Oil and Gas,Wuhan 430074,China)

机构地区：[1]长江大学非常规油气省部共建协同创新中心,武汉430100 [2]长江大学石油工程学院,武汉430100 [3]长江大学油气钻采工程湖北省重点实验室,武汉430100

出　　处：《油气与新能源》2025年第1期54-61,共8页Petroleum and new energy

基　　金：国家自然科学基金面上项目“页岩气藏压窜形成机理及暂堵转向对策研究”(52274028);湖北省教育厅科学研究计划重点项目“低渗透油藏降阻增注纳米乳液体系作用机理及影响因素研究”(D20231301);长江大学第十七批大学生创新创业训练计划项目“环路系统中甲烷水合物堵塞规律及解堵方法探究”。

摘　　要：水锁效应是影响油气产能的重要因素之一,低渗透致密砂岩气藏受孔喉结构的影响,水锁效应显著。纳米乳液因其粒径小、在固相表面吸附均匀、润湿改性效果好等,成为当前解水锁剂研究的重点方向。基于分子动力学模拟技术,研究了3种类型纳米乳液主成分在不同类型矿物表面的吸附作用机理,筛选出了更适用于致密砂岩气藏解水锁用纳米乳液。分子模拟结果表明,纳米乳液主成分与岩石矿物通过弱范德华作用力产生吸附效应,3种类型的纳米乳液在石英表面的吸附量远低于蒙脱石、高岭石,其中壬基酚聚氧乙烯醚(NPE)型纳米乳液可以穿透水分子层,在固相表面竞争吸附过程中优于其他两类纳米乳液。推荐使用NPE型纳米乳液作为致密砂岩气藏解水锁剂,且致密砂岩储层中解水锁效果由纳米乳液类型和矿物成分共同决定。研究为深化致密砂岩气藏纳米乳液解水锁剂吸附润湿改性机理提供理论依据。Water blocking effect is one of the important factors affecting oil and gas productivity and water lock effect is more significant due to the influence of pore throat structure in tight sandstone gas reservoirs with low permeability.Nano-emulsions,with their small particle size,uniform adsorption on solid surfaces,and good wetting modification effects,have become the focuses of research on water blocking agent.Based on molecular simulation technology,this paper studies the adsorption mechanism of the main components of three types of nano-emulsions on different types of mineral surfaces and selects more suitable nano-emulsions for water lock removal in tight sandstone gas reservoirs.The results of molecular simulation show that the main component of the nano-emulsion and rock minerals have adsorption effect through weak van der Waals force,and the adsorption capacity of the three types of nano-emulsion on the surface of quartz sand is much lower than that of montmorillonite and kaolinite.The NPE-type nano-emulsion can penetrate the water molecule layer and outperform the other two types of nano-emulsions in the solid surface competitive adsorption process.It is recommended to use NPE type nano-emulsion as water unlocking agent in tight sandstone gas reservoir,and the effect would be determined by the type of nano-emulsion and mineral composition.It provides a theoretical basis for deepening the mechanism of adsorption wetting modification of nano-emulsion water-unlocking agent for tight sandstone gas reservoirs.

关 键 词：致密砂岩气藏 纳米乳液 解水锁剂 吸附性能 分子模拟 

分 类 号：TE348[石油与天然气工程—油气田开发工程]