砂岩凝析气藏岩石润湿性微观调控机理研究  

STUDY ON MICRO-MECHANISM OF ROCK WETTABILITY CONTROL IN SANDSTONE CONDENSATE GAS RESERVOIR

作　　者：谢信捷 管彬[1] 何乐 魏传阳 雷梦 Xie Xinjie;Guan Bin;He Le;Wei Chuanyang;Lei Meng(Downhole Service Company,Chuanqing Drilling Engineering Co.,Ltd.,Chengdu 610052,Sichuan,China)

机构地区：[1]川庆钻探工程有限公司井下作业公司,四川成都610052

出　　处：《精细石油化工》2023年第4期37-41,共5页Speciality Petrochemicals

摘　　要：基于分子动力学模拟方法,对传统石英表面进行羟基化和甲基化处理来分别表征润湿性为亲水和亲油的砂岩储层岩石,通过计算砂岩凝析气藏中油、水等储层流体与石英表面的接触角、相互作用能,以及分析氟碳表面活性剂的静电势分布情况,研究了不同流体在石英表面的润湿行为与氟碳表面活性剂调控润湿性微观作用机理。结果表明:全氟辛基磺酰胺季铵盐氟碳表面活性剂可穿透液膜并在石英表面发生吸附,且由于静电势作用差异,与石英表面发生作用的为氟碳表面活性剂的头基,而带有氟碳链的尾基则裸露在外部,进而使石英表面表现出疏水、疏油的特性。Based on the molecular dynamics simulation method,the traditional quartz surface was hydroxylated and methylated to characterize the sandstone reservoir rocks with hydrophilic and lipophilic wettability,respectively.The wetting behavior of different fluids on the surface of quartz and the micro mechanism of fluorocarbon surfactant controlling wettability were studied by calculating the contact angle and interaction energy of reservoir fluids such as oil and water in sandstone condensate gas reservoirs and the surface of quartz.At the same time,the electrostatic potential distribution of fluorocarbon surfactants was analyzed.The results show that perfluorooctyl sulfonamide quaternary ammonium salt fluorocarbon surfactant selected in this paper can penetrate the liquid membrane and adsorb on the rock surface.In addition,due to the difference of electrostatic potential distribution,the head groups of fluorocarbon surfactant interact with the rock surface,while the tail groups with fluorocarbon chain are exposed.Finally,the quartz surface exhibits water and oil-repellent properties.

关 键 词：砂岩凝析气藏 润湿性 氟碳表面活性剂 调控机理 分子模拟 

分 类 号：TE355[石油与天然气工程—油气田开发工程]