Analysis of Surfactant Oil Displacement Characteristics Based on Thermodynamic Interface Interaction
Surfactant flooding is an important chemical flooding method,and thermodynamic the-ory is an effective means to essentially reveal the microscopic mechanism of the chemical flooding 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 C11H23(OC2H4)yOH 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 C11H23(OC2H4)yOH 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.
urfactantthermodynamic propertiesanalysis of morphological interphaseenthalpy-entropy compensationoil displacement mechanism
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