摘要
由于油井中后期产量下降,注水开发技术得到广泛应用。为优化注入水水质、净化地层,需提高采出水中的油水分离效率。油水分离效率的高低取决于对油水两相运动规律的掌握及分离方法的正确应用。该研究在油滴运动理论的基础上,借助Fluent有限元模拟软件,对油滴在流场中的变形和聚并动态进行精细描述。通过实验测试重力场中黏度为5.7 mPa·s和54 mPa·s、直径为3.0~8.5 mm的油滴上升速度及其变形规律。研究结果表明:直径较大的油滴具有较大的加速度,并提前达到最大速度,其上浮过程中的变形系数随着油相黏度的增加逐渐增加。多个油滴的聚合及其速度主要受连续相的黏度变化影响。在原有油滴速度计算模型的基础上考虑了表面张力对油滴变形的影响,得到的新模型对油滴的速度计算误差为±7%,显著提高了油滴速度的计算精度。
Due to the decline of production in the middle and late stages of oil wells,water injection development technology is widely used.In order to optimize the water quality of injection water and purify the formation,it is necessary to improve the oil-water separation efficiency in the extracted water.The efficiency of oil-water separation depends on the mastery of oil-water two-phase motion law and the correct application of separation methods.In this study,based on the theory of oil droplet motion,the deformation and aggregation dynamics of oil droplets in the flow field are finely described with the help of Fluent finite element simulation software.The rising velocity of oil droplets with viscosities of 5.7 mPa·s and 54 mPa·s and diameters of 3.0 mm to 8.5 mm in the gravitational field and their deformation laws were tested experimentally.The results show that oil droplets with larger diameters have larger acceleration and reach the maximum velocity in advance,and their deformation coefficients in the uplifting process gradually increase with the increase of oil phase viscosity.The aggregation of multiple oil droplets and their velocities are mainly influenced by the viscosity change of continuous phase.On the basis of the original oil droplet velocity calculation model,the influence of surface tension on the deformation of oil droplets is considered,and the error of velocity calculation of oil droplets is±7%in the new model obtained,which significantly improves the calculation accuracy of oil droplet velocity.
作者
王智慧
廖锐全
程阳
冯笑雅
袁旭
张兴凯
WANG Zhihui;LIAO Ruiquan;CHENG Yang;FENG Xiaoya;YUAN Xu;ZHANG Xingkai(Petroleum Engineering College of Yangtze University,Wuhan 430100,China;CNPC Key Laboratory of Oil and Gas Productions in Yangtze University,Jingzhou 434023,China;CNPC Multiphase Flow Laboratory of Gas Lift Innovation Center,Wuhan 430100,China;Key Laboratory of Drilling and Production Engineering for Oil and Gas,Wuhan 430100,China;Xi’an Changqing Chemical Group Co.,Ltd.,Xi’an 710021,China)
出处
《中国测试》
CAS
北大核心
2024年第6期10-19,共10页
China Measurement & Test
基金
国家自然科学基金项目(62173049)。
关键词
油水分离
油滴聚合
变形系数
有限元
表面张力
oil-water separation
oil droplet aggregation
deformation coefficient
finite element
surface tension
