地热井管系统热力学分析

发布时间：2021-11-21 13:08

　　如今,地热能作为一种可再生能源,因其可用于发电、产生稳定可靠的清洁能源而备受关注。然而,在从天然气藏中提取这种资源时,高温蒸汽流体会流经地热井系统,因而在施工阶段和运营过程中管道系统都会出现不同的失效模式,从而导致这种地下管道系统内部结构存在大量不确定性和挑战性。本文从地热井管道系统中选取了五种类型的地热井段进行热力学分析数值模拟,分别是无链接套管,有链接套管,以及三个位于不同部位的由于气泡引起的弱水泥护套带。本研究采用数值分析软件ABAQUS对此五种热力井管段进行两阶段热力学分析。本文首先对热力井管系统进行了文献综述,在此基础上通过数值分析对五种不同的井管段进行了在温度载荷和内外井壁压力载荷作用下的热力学模拟,并对五种井管段的分析仿真结果进行了对比。在分析中采用的边界条件为沿着纵向和径向为固定边界。温度荷载为300-550℃C,作用于钢质井管内表面,用于模拟在启动生产过程中热冲击引起的温度效应。由岩体施加的远场或地层的外部压力作用于水泥护套的外表面;蒸汽流体产生的压力作用于在钢质井管的内表面。本文数值分析中的材料参数取自相关文献,并假设含有气泡的水泥护套带具有相对较低的材料力学性能和... 

【文章来源】：北京交通大学北京市 211工程院校 教育部直属院校

【文章页数】：98 页

【学位级别】：硕士

【文章目录】：
ACKNOWLEDGEMENT
摘要
ABSTRACT
1 INTRODUCTION AND LITERATURE REV[EW
    1.1 DEVELOPMENT OF GEOTHERMAL SYSTEM
    1.2 CLASSIFICATION OF GEOTHERMAL RESOURCES
    1.3 ORGANIZATION OF DESIGN TEAM
    1.4 TYPES OF THERMAL WATERS
    1.5 THE GEOTHERMAL SYSTEMS AND TRANSPORT MECHANISMS
        1.5.1 Hot Dry Rock Systems
        1.5.2 Enhanced Geothermal Systems
        1.5.3 Deep Hydrothermal Systems
        1.5.4 Transport Mechanism
    1.6 PIPE SYSTEM OF GEOTHERMAL WELL
    1.7 LITERATAURE REVIEW ON THE FAILURE OF GEOTHERMAL WELL PIPESYSTEM
        1.7.1 Strength- yielding
        1.7.2 Creep at high temperatures
        1.7.3 Buckling
        1.7.4 Fatigue
        1.7.5 Casing failure modes and design criteria
        1.7.6 Connection (Coupling) failure
    1.8 PROBLEMS
    1.9 SCOPE AND OBJECTIVE OF THE STUDY
    1.10 ORGANIZATION OF THE CHAPTERS
2 WELL MATERIALS,PARAMETERS,FAILURE CRITERIA AND FEM MODELLINGPROCEDURE
    2.1 WELL MATERIALS
        2.1.1 Casing
        2.1.2 Casing Connections/joints/coupling
        2.1.3 Casing grade
        2.1.4 Cement sheath
        2.1.5 Formation
    2.2 MATERIAL PARAMETERS FOR NUMERICAL ANALYSIS
        2.2.1 Young's Modulus
        2.2.2 Poisson's Ratio
        2.2.3 Thermal Conductivity
        2.2.4 Specific heat
        2.2.5 Density
        2.2.6 Cement Sheath Band with Air Voids
        2.2.7 Pressure of the Pipe System
    2.3 FAILURE CRITERIA
        2.3.1 Von Mises Yielding Criteria
        2.3.2 Maximum Principal Stress Theory
    2.4 FINITE ELEMENT MODELLING PROCEDURE
        2.4.1 Geometry of the models
        2.4.2 Loading
        2.4.3 Boundary conditions and assumptions in FEM
        2.4.4 Global Meshing of FE model
    2.5 SUMMARY
3 THERMO-MECHANICAL ANALYSIS OF GEOTHERMAL WELL PIPE SYSTEM ATTHE START UP OF STEAM PRODUCTION
    3.1 THEORY OF THERMO-MECHANICAL ANALYSIS
        3.1.1 Temperature field
        3.1.2 Initial and boundary conditions
        3.1.3 Mathematical expression for thermo-mechanical analysis
    3.2 FIVE WELL SECTION CASES FOR THE PIPE SYSTEM ANALYSIS
        3.2.1 Boundary conditions
    3.3 MODELLING AND COMPARISON BETWEEN GEOMETERIC WELL SECTIONTYPES OF JOINTED AND UNJOINTED CASING
        3.3.1 Temperature field analysis
        3.3.2 Stress field analysis
    3.4 MODELLING AND COMPARISON BETWEEN WELL SECTIONS OF JOINTEDCASING AND JOINTED CASING WITH AIR-VOIDED CEMENT SHEATH BANDLOCATION NO.1
        3.4.1 Temperature field analysis
        3.4.2 Stress field analysis
    3.5 MODELLING AND COMPARISON BETWEEN WELL SECTIONS TYPES OFJOINTED CASING WITH AIR VOIDS CEMENT SHEATH BAND LOCATION NO.1AND LOCATION NO.2
        3.5.1 Temperature field analysis
        3.5.2 Stress field analysis
    3.6 MODELLING AND COMPARISON BETWEEN WELL SECTIONS TYPES OFJOINTED CASING WITH AIR VOIDED CEMENT SHEATH BAND LOCATION 2AND LOCATION 3
        3.6.1 Temperature field analysis
        3.6.2 Stress field analysis
    3.7 CROSS SECTIONAL TEMPERATURE ANALYSIS UNDER DIFFERENTCOMBINATIONS OF THERMAL CONDUCTIVITY AND SPECIFIC HEAT
    3.8 SUMMARY
4 CONCLUSIONS AND RECOMMENDATIONS
REFERENCES
学位论文数据集


【参考文献】：
期刊论文
[1]Thermal stresses analysis of casing string used in enhanced geothermal systems wells[J]. ZHANG Pei-feng.  Journal of Groundwater Science and Engineering. 2016(04)



本文编号：3509565