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系統識別號 U0026-1508201811080200
論文名稱(中文) 二氧化碳水合物生成實驗之數值模擬研究
論文名稱(英文) Numerical Simulation of CO2 Hydrate Formation in Lab-Scale Experiment
校院名稱 成功大學
系所名稱(中) 資源工程學系
系所名稱(英) Department of Resources Engineering
學年度 106
學期 2
出版年 107
研究生(中文) 許聿學
研究生(英文) Muhammad Dahyar
電子信箱 muhdahyarr@gmail.com
學號 N46057013
學位類別 碩士
語文別 英文
論文頁數 87頁
口試委員 口試委員-李明哲
口試委員-王志文
指導教授-謝秉志
中文關鍵字 二氧化碳水和物  實驗  數值模擬  敏感度分析 
英文關鍵字 CO2 Hydrate  Experiment  Numerical Simulation  Sensitive Analysis 
學科別分類
中文摘要 none
英文摘要 CO2 is a byproduct of burning fossil fuels and it is a gas that is notoriously associated with global warming, a concept that has had widespread effects on both human and environmental systems. Storing CO2 in solid hydrates are promising option for the long-term storage of CO2. The injection of CO2 into a hydrate layer may also replace CH4 as a guest molecule inside of an already-formed hydrate structure. This replacement reaction results in the release CH4 and the formation of CO2 hydrate. The formation rate of a hydrate is generally dependent upon the thermodynamic conditions. To obtain the optimal formation rate, this study was conducted to investigate the CO2 hydrate formation behavior in a laboratory setting.
In this study, the STARS simulator developed by CMG Ltd. was used to build a reliable model of the CO2 hydrate reaction and predict the behavior of CO2 hydrate formation in a reservoir. This research was based on experiments used in previous research conducted by the team from the National Taiwan University of Science and Technology (NTUST). The numerical simulation was modeled identically to that of the former experiment and it used as a reference for the similarity of the results of pressure and temperature. Sensitive analysis was carried out to understand the parameters affecting the reaction. The investigated parameters included the absolute permeability, relative permeability, activation energy, enthalpy, thermal conductivity and heat capacity.
This study was successful in establishing a CO2 hydrate model based on comparison with the results of experimentation. With the establishment of such a model, the following conclusions could be made: [1] rock and flow properties were the fundamental parameter which control hydrate formation, [2] the reaction parameters were the main parameter of the CO2 hydrate phase behavior which control the molecular exchange, and [3] the thermal properties of the porous medium did not greatly impact the hydrate formation. A directly proportional relationship between the hydrate concentration and average temperature distribution was determined to due the exothermic reactions that occurred at the boundary between the gas and the porous medium.
論文目次 ABSTRACT I
ACKNOWLEDGEMENT II
TABLE OF CONTENTS III
LIST OF TABLES VI
LIST OF FIGURES VII
CHAPTER 1 INTRODUCTION 1
1.1 Research Background 1
1.2 Objective 4
CHAPTER 2 LITERATURE REVIEW 5
2.1 Global Energy Demand 6
2.2 Hydrate Resources 7
2.3 Gas Hydrate Deposit 8
2.4 Correlation to Global warming 9
2.4.1 Global Warming 9
2.4.2 CO2 as greenhouse gasses 10
2.5 Anticipating of CO2 Emission 12
2.6 Recovery techniques 14
2.7 Characteristic of gas hydrate 16
2.7.1 Structure of hydrate 16
2.7.2 Thermal properties 18
2.7.3 Stability of hydrate 19
2.8 Hydrate formation 20
2.8.1 Hydrate Nucleation 20
2.9 Kinetic model of gas hydrate 22
2.10 Simulation study of gas hydrate 24
2.11 Literature Review of CO2 Hydrate and Previous Research 25
CHAPTER 3 RESEARCH DESIGN AND METHODOLOGY 27
3.1 Experimental 27
3.1.1 Experimental Apparatus 27
3.1.2 Materials 29
3.1.3 Experimental Process 30
3.2 Numerical simulation 31
3.2.1 CMG STARS 32
3.2.2 Governing Equations 32
3.2.3 Conservation Equations 32
3.3 Numerical Model Design 37
3.3.1 Grid Discretization 37
3.3.2 Initial Saturation 39
3.3.3 Formation Parameters 39
3.3.4 Component Properties 40
3.3.5 Hydrate Reaction 41
3.3.6 Rock Fluid Properties 43
3.3.7 Initial Condition 45
3.3.8 Well and Recurrent Data 45
CHAPTER 4 RESULTS 47
4.1. Initial Simulation Result 47
4.2. Sensitivity Analysis 52
CHAPTER 5 DISCUSSION 58
5.1 Comparison of Experimental and Simulation Final Results 58
5.2 Average Pressure 59
5.3 Temperature Profile 60
5.4 Cumulative CO2 Gas Injection 62
5.5 CO2 Hydrate volume 63
5.6 Spatial Distribution 64
CHAPTER 6 CONCLUSIONS AND SUGGESTIONS 69
6.1 Conclusions 69
6.2 Suggestions 70
REFERENCES 71
APPENDICES 75
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