页岩气水平井井筒压降模型研究  

Modeling Studies on Pressure Gradient Prediction for Shale Horizontal Gas Wells

作　　者：蔺景德 李焕文 刘印华 徐思渊 刘永辉[3] 曹玉峰 LIN Jingde;LI Huanwen;LIU Yinhua;XU Siyuan;LIU Yonghui;CAO Yufeng(Engineering Technology Research Institute,Coalbed Methane Co.,Ltd.,PetroChina,Xi′an 710082,China;China United Coalbed Methane National Engineering Research Center Co.,Ltd.,Beijing 100095,China;State Key Laboratory of Oil&Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China;Department of Petroleum Systems Engineering,University of Regina,Regina,SK S4S 0A2,Canada.)

机构地区：[1]中国石油煤层气有限责任公司工程技术研究院,西安710082 [2]中联煤层气国家工程研究中心有限责任公司,北京100095 [3]西南石油大学油气藏地质及开发工程国家重点实验室,成都610500 [4]Department of Petroleum Systems Engineering,University of Regina,SK S4S 0A2,Canada

出　　处：《石油矿场机械》2025年第1期6-11,共6页Oil Field Equipment

基　　金：中国石油天然气股份有限公司前瞻性基础性技术攻关项目“海陆过渡相页岩气高效开采技术研究”(2021DJ-2006);国家自然科学基金面上项目“水平井气携液单元运动模型及井简积液预测研究”(52374046)。

摘　　要：准确预测井筒压力是气井动态分析和排水采气工艺设计的关键。页岩气井不同生产阶段井筒流动参数变化范围大,初期产液量高套管生产,中后期产气量大幅度下降油管生产,现有工程常用压力模型难以准确预测页岩气井全生命周期井筒压降。采用试验、理论与工程应用相结合的思路分析了井筒压降组成,开展了气水两相井筒流动试验,明确了气流速、液流速、管径和井倾角对持液率的影响规律。基于井筒压降分析结果,以环状流与非环状流的流型转变界限作为压降建模界限。利用气芯和液膜动量平衡方程构建了环状流压降机理模型;基于Mukheijee-Brill模型,构建流动相似准数,拟合了适用于不同管径的持液率模型,形成了页岩气水平井井筒压降组合模型。收集现场94口页岩气井的数据,新模型平均百分误差为0.46%,表明模型预测精度高,能够满足工程需求。Dynamic analysis of gas wells and deliquification design are key to accurately predicting the wellbore pressure gradient.The wellbore flow parameters of shale gas wells vary widely in different production stages,with high fluid production in the early stage of casing production and greatly reduced gas production in the middle and late stages of casing production.It is difficult to accurately predict the wellbore pressure drop of shale gas wells throughout the production stage of shale gas wells.Therefore,the idea of this paper is to combine experiment,theory and engineering application.The composition of wellbore pressure drop was analyzed,and the simulation experiment of gas-water two-phase wellbore flow law was carried out,and the influence law of gas flow rate,liquid flow rate,pipe diameter and well inclination on liquid holdup was clarified.Based on the wellbore pressure drop analysis results,the pressure drop model is divided by the flow pattern transition boundary between annular flow and non-annular flow.The cyclic flow pressure drop mechanism model was constructed by the momentum balance equation of the gas core and liquid film.Based on the Mukheijee-Brill model,the flow similarity factor is constructed,and the liquid holdup models suitable for different pipe diameters are fitted to form the well pressure drop combination model of shale gas horizontal wells.The average percentage error of the new model is 0.46%,indicating that the model has high prediction accuracy and can meet the engineering requirements.

关 键 词：页岩气井 气水两相流 井筒压力降 持液率 

分 类 号：TE934.9[石油与天然气工程—石油机械设备]