井筒流压快速分析方法及其在CO_(2)井中的应用  

Rapid Analysis Method for Fluid Pressure in Wellbore and Its Application in CO_(2) Wells

作　　者：何邦超 次惠岭 白冰[2] 刘建锋[3] 邹炎 雷宏武[2] 崔银祥[2] He Bangchao;Ci Huiling;Bai Bing;Liu Jianfeng;Zou Yan;Lei Hongwu;Cui Yinxiang(Jiangsu Changjiang Geological Survey Institute;Hubei Key Laboratory of Environmental Geotechnology,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences;State Key Laboratory of Hydraulics and Mountain River Engineering,Sichuan University)

机构地区：[1]江苏长江地质勘查院 [2]中国科学院武汉岩土力学研究所环境岩土工程湖北省重点实验室 [3]四川大学水力学与山区河流开发保护国家重点实验室

出　　处：《石油机械》2024年第8期108-117,共10页China Petroleum Machinery

基　　金：国家自然科学基金项目“CO_(2)大规模封存泄漏规律及其与水土环境互馈机制研究”(U2344226);四川省省院省校合作项目“深部咸水层CO_(2)地质封存与防灾研究”(2022YFSY0007);古露高温地热井综合测试服务(JSSD/DK/202206/0001)。

摘　　要：井筒作为井筒内工质流体和地下储层发生物质和能量交换的主要通道,其内部流体温度场和压力场的准确预测是深部流体注采工程中至关重要的内容,控制工程生产效率与安全性评估。通过总结前人研究工作,发现井筒内流体压力随深度近似线性变化的特征,在此基础上,提出一种关于井筒内流压的快速分析方法;建立了基于井筒内流体的质量守恒方程、动量守恒方程和能量守恒方程的井筒内流体温度、压力耦合计算模型,并利用该耦合模型就所提快速分析方法中待定参数与流体工况、井筒参数、地层物性等参数变化的敏感性进行分析;针对CO_(2)井,给出了井筒内流压快速分析表达式,结合工程现场数据进行验证,压力解精度在工程应用许可的范围内。所提井筒内流压快速分析方法基于文献统计得出,适用于气井、液井、生产井、注入井等,覆盖范围较广,具有计算参数少、方便快捷的特点,针对某指定工质流体的快速分析表达式中的待定参数可由室内研究人员给出。研究结果对现场工程师具有极大的便利性。Wellbore is the main channel for material and energy exchange between the working fluid in the wellbore and the subsurface reservoir,and the accurate prediction of fluid temperature and pressure fields in the wellbore is a crucial part in deep fluid injection and production engineering,and it conteols the operation efficiency and safety evaluation.Literature review reveals that the fluid pressure in the wellbore changes approximately linearly with depth.On this basis,a rapid analysis method for fluid pressure in the wellbore was proposed.Then,a coupled calculation model for fluid temperature and pressure in a wellbore was built based on the mass conservation equation,momentum conservation equation and energy conservation equation of the fluid in the wellbore,and the coupled model was used to analyze the variation sensitivity of the parameters such as the undetermined parameters,fluid conditions,wellbore parameters and physical properties of formation proposed in the rapid analysis method.Finally,for CO_(2) wells,a rapid analysis expression for fluid pressure in the wellbore was presented,and verified with engineering field data,showing that the accuracy of the pressure solution is within the range permitted by engineering applications.The rapid analysis method for fluid pressure in the wellbore proposed in the paper is obtained from the statistics of literatures,suitable for gas wells,liquid wells,production wells and injection wells,having a wide coverage range,and has the characteristics of convenient and fast calculation with fewer parameters.The undetermined parameters in the rapid analysis expression for a specified working fluid can be provided by office researchers.Overall,the proposed method has great convenience for field engineers.

关 键 词：井筒流动模型 快速分析方法 一维稳态流动 流体压力 敏感性分析 CO_(2)井 

分 类 号：TE33[石油与天然气工程—油气田开发工程]