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Study on the Mechanism of Oil Droplets Coalescence Fitting to the Disperse Phase of ASP Flooding Product

Author: XuBin
Tutor: ZhangLvHong
School: Tianjin University
Course: Chemical Engineering
Keywords: Oil droplet coalescence Electrical double layer repulsion Liquid film draining Marangoni effect
CLC: TE39
Type: Master's thesis
Year: 2008
Downloads: 136
Quote: 0
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Abstract


Ternary ( alkali surfactant polymer ) flooding oil technology is developing rapidly , and achieved a good field test results . ASP flooding produced liquid water content of the seriously emulsified oil droplet surface due to the adsorption of the anionic surfactant solution and charged , the repulsion between the oil droplets to increase , it is difficult to coalescence . Separation more difficult than water flooding and polymer flooding produced fluid separation difficulty markedly improved, poly - and oil - water separation efficiency of oil-water emulsion oil droplets have a significant impact , it is necessary to study the mechanism and the oil droplets poly . The liquid film draining process description between two oil droplets clip this article established theoretical model , the first time the introduction of the electric double layer repulsion between oil droplets factors model , the system examines the influencing factors on the oil droplet coalescence process , the following The main conclusions : the electric double layer repulsion of oil droplets coalescence and serve to hinder the role , the greater the electrical double layer repulsion , the liquid film draining the slower the speed , the smaller the pressure of the liquid film , the more uniform distribution of the oil-water interface surfactant . The effect of the van der Waals' forces and electric double layer repulsion On the contrary, it is one of the main factors that promote liquid membrane rupture . Poly also affect the oil droplets close to the speed of the droplets , the oil droplets at low speed near the liquid film draining favor high speed close to the to hinder liquid film draining . The liquid membrane rupture in three ways : Center rupture , the liquid film to maintain stability and edge cracks . Low approach speed , the weak electrical double layer repulsion and the strong van der Waals gravitational easily lead center rupture ; high close to the speed, and strong electric double layer repulsion and weak van der Waals gravity easily lead liquid film does not rupture ; when close to the speed, the electric double layer repulsion and the van der Waals' forces in the intermediate state , the liquid film will discharge deformation , the to generate edge of the rupture . Discharge Peclet number , dispersed and continuous phase viscosity ratio are affected by changing the speed of the interface of the oil-water interface . The larger the Peclet number , Marangoni effect is more significant , the slower the drain . Viscosity ratio is smaller the greater the speed of the interface , the slower the drain . The oil-water interface surfactant initial concentration would retard droplet coalescence . The higher the initial concentration , the liquid film rupture required a longer time . Oil droplets in parallel to the oil film on the poly and time , the results than to describe the pure model better agreement with the experimental values ??calculated with the proposed model .

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CLC: > Industrial Technology > Oil and gas industry > Oil and gas development and mining > Oil field of Applied Chemistry
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