低流量水平井油水两相分层流速度场数值模拟与实验研究  

Numerical simulation and experimental studies on velocity field of oil and water stratified flow in low flow rate horizontal wells

作　　者：宋红伟[1,2] 郭海敏 史航宇[2] 王青川 SONG HongWei;GUO HaiMin;SHI HangYu;WANG QingChuan(Key Laboratory of Exploration Technologies for Oil and Gas Resources(Yangtze University)Ministry of Education,Wuhan 430100,China;Hubei Cooperative Innovation Center of Unconventional Oil and Gas,Wuhan 430100,China;Well Testing Company,Qinghai Oilfield,Mangya 816499,China)

机构地区：[1]油气资源与勘探技术教育部重点实验室(长江大学),武汉430100 [2]非常规油气湖北省协同创新中心,湖北武汉430100 [3]青海油田测试公司,茫崖816499

出　　处：《地球物理学进展》2021年第3期1103-1110,共8页Progress in Geophysics

基　　金：国家自然科学基金项目(41474115);油气资源与勘探技术教育部重点实验室(长江大学)开放基金(K2018-2)联合资助。

摘　　要：低流量水平井中,由于存在重力分异,油水两相的流型主要以分层流为主,流体速度场的分布沿重力方向发生变化,致使油田现场生产测井的流量和持水率测量及多相流分相流量解释非常困难.为了充分了解水平井流体流动特征提高生产测井解释精度,本文以低流量水平井油水两相分层流为研究对象,采用流体动态测量实验和数值模拟计算相结合的方法,研究其速度场的分布特征及油水滑脱速度与持水率、总流量的变化关系.数值模拟计算和动态实验结果对比分析表明;依据N-S方程和相应的界面耦合条件构建的分层模型计算的结果和动态实验基本一致,含水率误差在5%以内,能够用来分析水平井油水两相分层流的局部速度的变化;过流管道下部由于仪器的存在,当含水低于20%时,水相平均速度低于油相平均速度,随着含水的增加,水相平均速度大于油相平均速度,滑脱速度逐渐变为负值.模型验证和实验结果表明,文中所提的分层流数值计算模型能够取得很好的应用效果,为水平井生产测井方法设计和资料解释奠定理论基础.In low flow rate horizontal wells, the main flow pattern of oil-water two-phase flow is stratified flow because of gravity differentiation, and the distribution of fluid velocity field changes along gravity direction. So it is very difficult to measure the mixture flow and water holdup, and interpret each phase flow of production logging. In order to fully understand the fluid flow characteristics of horizontal wells and improve the accuracy of production logging, the oil-water two-phase stratified flow in low-flow rate horizontal wells is studied. The method of combining fluid dynamic measurement experiments and numerical simulation calculations is used to study the velocity field. The distribution characteristics of velocity field and the relationship between oil-water slippage velocity, water holdup and mixture total flow rate were studied. The comparison between numerical simulation and dynamic experimental results shows that the results of stratified model based on Navier-Stokes equation and corresponding interface coupling conditions are basically consistent with those of dynamic experiments, and the water cut error is less than 5%, which can be used to analyze the local velocity variation of oil-water two-phase stratified flow in horizontal wells. The average velocity of water phase is lower than that of oil phase when water cut is less than 20% due to the existence of instruments. With the increase of water cut, the average velocity of water phase is higher than that of oil phase, and the slippage velocity becomes negative gradually. The results of model verification and experiment show that the stratified flow numerical calculation model proposed in the article can achieve good application results, laying a theoretical foundation for the design of horizontal well production logging methods and data interpretation.

关 键 词：水平井 油水两相流 分层流 数值模拟 动态实验 

分 类 号：P631[天文地球—地质矿产勘探]