Study On Emulsification Performance Of Binary Flooding System In Conglomerate Reservoir

The purpose of this paper is to study the emulsification performance of conglomerate reservoir in the process of oil displacement and recovery,using polymer/surfactant as oil displacement agent.Through the study of crude oil emulsion,crude oil simulated emulsion was prepared.The stability and demulsification process of the emulsion was investigated by particle size analysis,spectral analysis and Zeta potential analysis.The result show that the change process after the formation of the emulsion is the process that particle aggregation,particle size increasing,oil phase floating,water phase falling and emulsion phase decreasing.The best method to study the stability of emulsion is particle size analysis.Through the analysis of particle size,viscosity and water precipitation rate of emulsion that formed under different influencing factors(surfactant type and concentration,polymer molecular weight and concentration,water-oil ratio,shear strength,temperature,p H value of water and the content in water about Na⁺,Ca²⁺,Fe³⁺),it is found that those factors have different effects on the formation and properties of emulsion,It has great significance for the oil exploitation.using polymer/surfactant binary system.Through using hydrophilic and oleophilic photolithographic glass microscopic models to simulate cores to carry out microscopic oil displacement experiments.The micro-displacement device is used to record the displacement process and analyze the emulsification and seepage process in the displacement process.The results show that the residual oil in hydrophilic model mainly distributes at the intersection of pore,the residual oil in oleophilic model mainly distributes in narrow roar,and the displacement process of the two models is similar.The emulsification of polymer/surfactant binary flooding system in near-wellbore fracture system and near-wellbore matrix system was investigated by physical model oil displacement experiment,and the effect of emulsification on improving oil recovery.it shows that the emulsification of oil and water in fracture system is stronger than that in matrix system,and the degree of emulsification increases with the extension of migration distance.Emulsification can improve oil recovery,and the stronger the degree of emulsification,the higher the enhanced oil recovery.