基于CFD-PBM模型的井下油水旋流分离器结构优选  

Structure Optimization of Downhole Oil-Water Hydrocyclone Based on CFD-PBM Model

作　　者：任向海[1,2] 彭振华[1,2] 丁雯[1,2] 李默 闫月娟[3] Ren Xianghai;Peng Zhenhua;Ding Wen;Li Mo;Yan Yuejuan(Petroleum Engineering Technology Research Institute,Sinopec Northwest Oil Field Company;Sinopec Key Laboratory of Enhanced Oil Recovery in Carbonate Fractured-Vuggy Reservoirs;School of Mechanical Science and Engineering,Northeast Petroleum University)

机构地区：[1]中国石化西北油田分公司石油工程技术研究院 [2]中国石化碳酸盐岩缝洞型油藏提高采收率重点实验室 [3]东北石油大学机械科学与工程学院

出　　处：《石油机械》2023年第6期66-73,共8页China Petroleum Machinery

基　　金：“十三五”国家油气重大专项示范工程“缝洞型油藏提高采收率配套技术工艺示范”(2016zx05053-004);中石化科研项目“顺北深层断溶体油藏注采工艺技术研究”(P21064-3)。

摘　　要：针对高含水低产量稠油井井下油水分离和同井回注技术,设计了小直径井下油水旋流分离器。基于CFD-PBM耦合模型,对旋流器内液液两相流动规律和油滴破碎机理进行了数值模拟,采用正交试验方法,对旋流器关键结构参数进行了优选,并对优选后的结构进行了处理量变化和油相黏度变化对旋流器分离性能影响的研究。研究结果表明:对旋流分离器溢流口质量效率影响的主要因素由大到小依次为小锥段锥角、溢流管直径、大锥段锥角和尾管长度。处理量变化对旋流器分离性能影响较大,随着处理量增大,油滴破碎概率增加,油水分离效率呈先增大后减小的趋势;油相黏度在40~160 mPa·s范围内,黏度变化对分离性能影响不大,但黏度超过160 mPa·s后,旋流器分离效率快速下降。研究成果可为碳酸盐岩缝洞型油藏开展稠油井井下同井注采工艺提供技术支撑。A small-diameter downhole oil-water hydrocyclone was designed for downhole oil-water separation and the re-injection of separated water in heavy oil wells with low production and high water cut.The liquid-liquid two-phase flow law and oil droplet breakup mechanism of the hydrocyclone were numerically simulated using a CFD-PBM model.The key structural parameters of the hydrocyclone were optimized through the orthogonal test,and the effects of changes in the treatment capacity and oil phase viscosity on the separation performance of the optimized hydrocyclone were analyzed.The results show that the main factors affecting the mass efficiency of the overflow port of the hydrocyclone are small-cone-angle,diameter of the overflow pipe,large-cone-angle,and liner length,in a descending order of effect.The treatment capacity has a greater impact on the performance of the hydrocyclone;with the increasing capacity,the oil droplet breakup probability increases,and the oil-water separation efficiency grows and then falls.The change of oil phase viscosity in the range of 40~160 mPa·s has no considerable effect on the separation performance.However,once the viscosity exceeds 160 mPa·s,the separation efficiency of the hydrocyclone decreases rapidly.The research findings provide a technical support for downhole injection and production in heavy oil wells in carbonate fractured-vuggy reservoirs.

关 键 词：碳酸盐岩缝洞型油藏 稠油井 井下油水分离 水力旋流器 低处理量 CFD-PBM模型 

分 类 号：TE934[石油与天然气工程—石油机械设备]