基于格子玻尔兹曼方法的井筒热流固耦合数值模拟  

Lattice Boltzmann Model for Simulating Heat-fluid-solid Interaction in Wellbore

作　　者：胡春余 HU Chunyu(SINOPEC Xinjiang Xinchun Petroleum Development Co.Ltd,Wusu,Xinjiang 833300,China)

机构地区：[1]中石化新疆新春石油开发有限责任公司,新疆乌苏833300

出　　处：《计算物理》2024年第3期316-324,共9页Chinese Journal of Computational Physics

基　　金：国家自然科学基金企业创新发展联合基金(U20B6003)资助。

摘　　要：基于格子玻尔兹曼方法(LBM)建立一种求解井筒温度分布的模型。该模型可同时求解井筒内流体的温压耦合流动、流体流动中的强制热对流和井筒与地层的流固热交换三种效应的控制方程,实现井筒内流体域流动场-流体域温度场-固体域温度场三场的耦合求解,克服了传统模型井筒流速为定值的缺陷,并且具有更广的适用范围。通过理论分析和对比分析,验证模型的可靠性和精度。研究结果表明:井筒内流体流速变化影响流体在井筒中的温度分布,在产出条件下,在同一深度处会造成流体中心温度高、流体边界处温度低的分布情况。流体沿井筒轴向的温度的下降趋势会经历缓-稳-缓三个阶段,且此三个阶段受到流动雷诺数或者流体普朗特数的影响。A model based on lattice Boltzmann method(LBM)is developed to solve the heat transfer problems in the wellbore,which can simultaneously solve the controlling equations of temperature-pressure coupled flow of fluid in the wellbore,forced thermal convection in fluid flow and fluid-solid heat exchange between the wellbore and the formation,so it can realize the coupling solution of fluid flow field,fluid temperature field and wellbore temperature field,and compared with the traditional model,it not only overcomes the defect that the velocity is constant in wellbore,but also has a wider scope of application and higher computational efficiency.The reliability and accuracy of the model have been verified by comparative analysis with previous studies.The results show that the change of fluid velocity in the wellbore affects the temperature distribution of the fluid in the wellbore.Under the production condition,the temperature distribution at the center of the fluid is high and the temperature at the boundary of the fluid is low at the same depth.The downward trend of fluid temperature along the shaft axis will go through three stages:slow,steady and slow,and these three stages are affected by flow Reynolds number or fluid Prandtl number.

关 键 词：井筒温度 井筒压力 格子玻尔兹曼 普朗特数 耦合计算 

分 类 号：TE31[石油与天然气工程—油气田开发工程]