注水井井筒动态流体力学建模与工程仿真  

Modelling and engineering simulation of fluid mechanics in water injection wellbores

作　　者：贾德利[1] 温昊扬 孙福超[1] 王全宾[1] 杨清海[1] 付涛[1] JIA Deli;WEN Haoyang;SUN Fuchao;WANG Quanbin;YANG Qinghai;FU Tao(PetroChina Research Institute of Petroleum Exploration&Development,Beijing 100083,China;School of Information Science and Engineering,China University of Petroleum(Beijing),Beijing 102249,China)

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国石油大学(北京)信息科学与工程学院,北京102249

出　　处：《石油勘探与开发》2023年第5期1074-1082,共9页Petroleum Exploration and Development

基　　金：国家自然科学基金面上项目“大数据驱动下的老油田水驱精细分析方法研究”(52074345);中国石油天然气集团有限公司科学研究与技术开发项目“智能分层注采工程技术研究”(2021ZG12)。

摘　　要：为了研究注水井井筒工况下流体动态响应机理,基于流体力学微元分析和水力学经典理论,建立流体微元压力-流速关系模型,推导求解注水井井筒空间流体压力、流速的动态分布;结合中国某典型斜井生产数据,进行不同注入压力和不同注入量条件下井筒压力动态分布、油管流体传输延迟特性和衰减特性、井口压力波动下井筒压力幅值动态分布的数值模拟与分析。结果表明:井筒沿程压力损失与绝对压力值无关,设计波码通信编解码方案时无须考虑注入的绝对压力值;注入压力恒定时,井口注入流量越大,井筒沿程损失越大。流体波信号延时幅值主要取决于井筒的长度;管径越小,流体波信号衰减幅度越大。同井深下生成目标波码幅值(压差识别有效值)越高,为克服井筒沿程损失所需的井口压力波幅值越大。To study the fluid dynamic response mechanism under the working condition of water injection well borehole,based on the microelement analysis of fluid mechanics and the classical theory of hydrodynamics,a fluid microelement pressure-flow rate relationship model is built to derive and solve the dynamic distribution of fluid pressure and flow rate in the space of well borehole.Combined with the production data of a typical inclined well in China,numerical simulations and analyses are carried out to analyze the dynamic distribution of wellbore pressure at different injection pressures and injection volumes,the delayed and attenuated characteristics of fluid transmission in oil tube,and the dynamic distribution of wellbore pressure amplitude under the fluctuation of wellhead pressure.The pressure loss along the wellbore has nothing to do with the absolute pressure,and the design of the coding and decoding scheme for wave code communication doesn’t need to consider the absolute pressure during injecting.When the injection pressure is constant,the higher the injection flow rate at the wellhead,the larger the pressure loss along the wellbore.The fluid wave signal delay amplitude mainly depends on the length of the wellbore.The smaller the tubing diameter,the larger the fluid wave signal attenuation amplitude.The higher the target wave code amplitude(differential pressure identification root mean square)generated at the same well depth,the greater the wellhead pressure wave amplitude required to overcome the wellbore pressure loss.

关 键 词：分层注水 井筒流体 流体力学 动态响应 无线通信 

分 类 号：TE357[石油与天然气工程—油气田开发工程]