如今,地熱能作為一種可再生能源,因其可用于發(fā)電、產(chǎn)生穩(wěn)定可靠的清潔能源而備受關(guān)注。然而,在從天然氣藏中提取這種資源時,高溫蒸汽流體會流經(jīng)地熱井系統(tǒng),因而在施工階段和運營過程中管道系統(tǒng)都會出現(xiàn)不同的失效模式,從而導致這種地下管道系統(tǒng)內(nèi)部結(jié)構(gòu)存在大量不確定性和挑戰(zhàn)性。本文從地熱井管道系統(tǒng)中選取了五種類型的地熱井段進行熱力學分析數(shù)值模擬,分別是無鏈接套管,有鏈接套管,以及三個位于不同部位的由于氣泡引起的弱水泥護套帶。本研究采用數(shù)值分析軟件ABAQUS對此五種熱力井管段進行兩階段熱力學分析。本文首先對熱力井管系統(tǒng)進行了文獻綜述,在此基礎(chǔ)上通過數(shù)值分析對五種不同的井管段進行了在溫度載荷和內(nèi)外井壁壓力載荷作用下的熱力學模擬,并對五種井管段的分析仿真結(jié)果進行了對比。在分析中采用的邊界條件為沿著縱向和徑向為固定邊界。溫度荷載為300-550℃C,作用于鋼質(zhì)井管內(nèi)表面,用于模擬在啟動生產(chǎn)過程中熱沖擊引起的溫度效應。由巖體施加的遠場或地層的外部壓力作用于水泥護套的外表面;蒸汽流體產(chǎn)生的壓力作用于在鋼質(zhì)井管的內(nèi)表面。本文數(shù)值分析中的材料參數(shù)取自相關(guān)文獻,并假設(shè)含有氣泡的水泥護套帶具有相對較低的材料力學性能和... 

【文章來源】：北京交通大學北京市 211工程院校 教育部直屬院校

【文章頁數(shù)】：98 頁

【學位級別】：碩士

【文章目錄】：
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
學位論文數(shù)據(jù)集


【參考文獻】：
期刊論文
[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)



本文編號：3509565