煤层气集输管网多压降模型下水热力模拟  

Hydrothermal Simulation of Multi-pressure Drop Model for Coalbed Methane Gathering and Transportation Pipeline Network

作　　者：尹峰峰 张强[2] 李凌云[3] 杜永红[2] 陈鹏轩 张冬超[3] 宫敬[1] 康琦 YIN Fengfeng;ZHANG Qiang;LI Lingyun;DU Yonghong;CHEN Pengxuan;ZHANG Dongchao;GONG Jing;KANG Qi(College of Mechanical and Transportation Engineering,China University of Petroleum(Beijing)//National Engineering Research Center for Oil and Gas Pipeline Transportation Safety//Beijing Key Laboratory of Urban Oil and Gas Distribution Technology//Ministry of Education Key Laboratory of Petroleum Engineering;Tarim Oilfield Company,CNPC;Beijing Dwell Company Limited;Department of Automation,Tsinghua University//Research Institute of Tsinghua University in Shenzhen)

机构地区：[1]中国石油大学(北京)机械与储运工程学院·油气管道输送安全国家工程研究中心·城市油气输配技术北京市重点研究室·石油工程教育部重点实验室,北京市102200 [2]中国石油塔里木油田公司 [3]北京迪威尔石油天然气技术开发有限公司 [4]清华大学自动化系·深圳清华大学研究院

出　　处：《油气田地面工程》2025年第4期15-23,共9页Oil-Gas Field Surface Engineering

基　　金：重点研发计划(2022YFC2806200)。

摘　　要：鉴于以往的研究成果对于管网水热力结合模拟介绍并不清楚,如何结合相变及各多相压降模型仍有疑问。以某煤层气集输管网为例,考虑到煤层气流动中凝析水析出形成气液两相流,通过PR状态方程闪蒸确定煤层气流动中的气液相占比;各管道压降、温降采用分段差分计算。对管网运用先水力后热力的结合模拟,采用Aitken加速的线性逼近法结合多种压降关系式进行管网水力计算;将拓扑排序用于得到管网中温度求解顺序,进行热力计算。最终,将模拟结果与PIPESIM模拟结果对比,节点压力相对误差不超过6%,节点温度绝对误差在1.5℃之内,计算井口回压与实测井口回压偏差为11.5%。基于耦合相变的水热力结合模拟,得到了煤层气在管网中的流动状况及温度、压力、管道析出水量等参数,可为管网工况分析提供参考。In view of the previous introduction of hydrothermal combined simulation of pipeline network is not clear,how to combine phase transition and various multiphase pressure drop models is still questionable.Taking a certain coalbed methane(CBM)pipeline network as an example,considering the gas-liquid twophase flow formed by condensate precipitation in the flow of coalbed methane,the gas-liquid phase proportion in the flow of coalbed methane is determined by the PR equation of state for flash evaporation,and the pressure drop and temperature drop of each pipeline are calculated by the segmental difference.The pipeline network is simulated using the combination of hydraulic first and then thermal simulation,and the hydraulic calculation of the pipeline network is carried out by the linear approximation method accelerated by Aitken combined with a variety of pressure-drop equations.Topological ordering is used to obtain the order of the temperature solution in the pipeline network,and the thermal calculation is carried out.Finally,comparing the simulation results with the PIPESIM simulation results,the relative error of the nodal pressure is no more than 6%,the absolute error of the nodal temperature is within 1.5℃,and the deviation of the calculated wellhead back pressure from the measured wellhead back pressure is 11.5%.The hydrothermal combined simulation based on the coupled phase change obtains the flow condition of CBM in the pipeline network and the parameters of temperature,pressure,and water precipitation in the pipeline,which can be used as a reference for the analysis of the pipeline network working conditions.

关 键 词：煤层气集输管网 水热力结合模拟 线性逼近法 Aitken加速 拓扑排序 分段差分 

分 类 号：TE832[石油与天然气工程—油气储运工程]