基于热力学界面作用的表面活性剂驱油特性分析  

Analysis of Surfactant Oil Displacement Characteristics Based on Thermodynamic Interface Interactio

作　　者：董芋双 王志国[1] 李徐佳[2] 赵越超[3] 赵子琦 宋永臣[4] DONG Yushuang;WANG Zhiguo;LI Xujia;ZHAO Yuechao;ZHAO Ziqi;SONG Yongchen(School of Civil Engineering,Northeast Petroleum University,Daqing 163318,China;College of Vehicles and Energy,Yanshan University,Qinhuangdao 066004,China;Sanya Offshore Oil&gas Research Institute,Northeast Petroleum University,Sanya 572025,China;School of Energy and Power,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]东北石油大学土木建筑工程学院,大庆163318 [2]燕山大学车辆与能源学院,秦皇岛066004 [3]东北石油大学三亚海洋油气研究院,三亚572025 [4]大连理工大学能源与动力学院,大连116024

出　　处：《工程热物理学报》2024年第12期3626-3633,共8页Journal of Engineering Thermophysics

基　　金：国家自然科学基金项目(No.52076030);河北省自然科学基金项目(No.E2022203036)。

摘　　要：表面活性剂驱油是重要的化学驱油方法,热力学理论是从本质上揭示化学驱油过程微观机理的有效手段。本文基于热力学方法,针对表面活性剂油–水相界面变化的吸附特性及胶束化过程的聚集特性,提出了表面活性剂驱油的界面分析模型和胶束化热力学模型,构建了热力学能量分析方程。选取典型的非离子型C_(11)H_(23)(OC_(2)H_(4))_(y )OH表面活性剂,采用表面张力法确定其界面张力变化情况及临界胶束浓度。结果表明:胶束化过程是一个自发的吸热过程,温度升高有利于胶束化的进行,熵是胶束化的主要推动力,且存在线性的焓熵补偿关系。对于C_(11)H_(23)(OC_(2)H_(4))_(y )OH表面活性剂,较短的氧乙烯单元基团和温度的升高有利于胶束化进行,稳定性更好,并使表面活性剂在油–水界面上降低界面张力的能力和界面活性提高。Surfactant fooding is an important chemical fooding method,and thermodynamic the-ory is an effective means to essentially reveal the microscopic mechanism of the chemical fooding process.Based on the thermodynamic method,this paper proposes an interface analysis model and a micellization thermodynamic model for surfactant oil displacement based on the adsorption charac-teristics of the surfactant oil-water phase interface changes and the aggregation characteristics of the micellization process,and constructs a thermodynamic energy analysis equation.A typical nonionic C_(11)H_(23)(OC_(2)H_(4))_(y)OH surfactant was selected,and the surface tension method was used to determine its interfacial tension changes and critical micelle concentration.The results show that the micel-lization process is a spontaneous endothermic process.The increase in temperature is conducive to the progress of micellization.Entropy is the main driving force of micellization,and there is a linear enthalpy-entropy compensation relationship.For the C_(11)H_(23)(OC_(2)H_(4))_(y)OH nonionic surfactant,the shorter EO group and the increase in temperature are conducive to micellization,better stability,and enable the surfactant to reduce the interfacial tension at the oil-water interface.The ability and interfacial activity are improved.

关 键 词：表面活性剂 热力学特性 相界面分析 焓熵补偿 驱油机理 

分 类 号：TE357[石油与天然气工程—油气田开发工程]