Mechanism of Frequency Conversion Vibration Stimulating Exploiting Technology with Marine Gas Hydrate and its Numerical Simulation

2011 ◽  
Vol 201-203 ◽  
pp. 413-416
Author(s):  
Zhen Guo Zhang ◽  
Lian Feng Gao ◽  
Ying Zhang ◽  
Yu Wang ◽  
Guo Yuan Shi ◽  
...  
Keyword(s):  
Gas Hydrates ◽  
Gas Hydrate ◽  
Frequency Conversion ◽  
Stable State ◽  
High Energy ◽  
High Energy Density ◽  
Thermal Methods ◽  
Replacement Method ◽  
Marine Gas Hydrate ◽  
Hydrate Saturation

Gas hydrate is a new energy in the 21st century with the characteristics of high energy density, huge amount of resources and cleaning. It has important significances for resources development, environmental protection and global climate changing. Due to the limitations of the occurrence mode and the technical level of marine gas hydrates, at present, the development and utilization of the resources are still tentative. This article analyzed and evaluated several key technologies to develop marine gas hydrates, that is depressurization, thermal methods, chemical injection method, CO2 replacement method, and fluorine gas+microwave method. However, these methods are difficult to control in the mining process. The research based on the properties of the occurrence of marine gas hydrate, used the principle of gas hydrate decomposition caused by vibration, by adjusting the excitation intensity, frequency, and amplitude. Different local oscillator strength applied on the Occurrence of gas hydrate layer. Gas hydrate stable state changed in mining region, prompting the gas hydrate conversing from solid to gas. Numerical simulations show: Low-frequency vibration should be used in the layers with higher hydrate saturation. The vibration frequency should be improved in the layers with lower hydrate saturation. The method has a good controllability for the region and the process of mining, avoiding geological disasters and environmental issues in the seabed caused by the mining process losing control.

Fracturing Mechanism of Marine Gas Hydrate with Vibration and Model of Experimental Device

2011 ◽  
Vol 284-286 ◽  
pp. 2493-2496
Author(s):  
Zhen Guo Zhang ◽  
Guo Yuan Shi ◽  
Ying Zhang ◽  
Lian Feng Gao ◽  
Chang Shui Liu ◽  
...  
Keyword(s):  
Gas Hydrate ◽  
Stable State ◽  
Local Oscillator ◽  
Thermal Methods ◽  
Hydrate Decomposition ◽  
Replacement Method ◽  
Marine Gas Hydrate ◽  
New Energy ◽  
The Stability ◽  
Fracturing Mechanism

Marine gas hydrate is a new energy in the 21st century with the huge amount of resources and cleaning. But its decomposition and the release can lead to decrease the stability of seabed, causing submarine landslide. And its overflowed can intensify the greenhouse effect, interaction between which can lead to more serious ecological and environmental disasters. All of the exploitation technologies, such as depressurization, thermal methods, chemical injection method, CO2 replacement method, and fluorine gas+microwave method, are limitations in controlling of the decomposed rates and decomposed range. The research based on the marine gas hydrate decomposition caused by vibration, by adjusting the excitation intensity, frequency, and amplitude. Different local oscillator strength applied on the occurrence of gas hydrate layer. Gas hydrate stable state changed in mining region, prompting the gas hydrate conversing from the sediments. Model of the experiment is made for simulations on the decomposition of gas hydrate. This method has a good controllability for the region and the process of mining, avoiding geological disasters and environmental issues in the seabed caused by the mining process.

The Resource Characteristics of Marine Gas Hydrates and the Assessment of its Exploitation Technology

2011 ◽  
Vol 383-390 ◽  
pp. 6523-6529
Author(s):  
Zhen Guo Zhang ◽  
Ying Zhang ◽  
Lian Feng Gao
Keyword(s):  
Gas Hydrates ◽  
Global Climate ◽  
High Energy ◽  
High Energy Density ◽  
Thermal Methods ◽  
Replacement Method ◽  
Occurrence Mode ◽  
New Energy ◽  
Development And Utilization ◽  
Resource Characteristics

Gas hydrate is a new energy in the 21st century with the characteristics of high energy density, huge amount of resources and cleaning. It has important significances for resources development, environmental protection and global climate changing. Due to the limitations of the occurrence mode and the technical level of marine gas hydrates, at present, the development and utilization of the resources are still tentative. This article analyzed and evaluated several key technologies to develop marine gas hydrates, that is depressurization, thermal methods, chemical injection method, CO2 replacement method, and fluorine gas+microwave method.

Soaking effects on CH4-CO2 replacement efficiency in gas hydrates

2020 ◽  
Author(s):  
Jongwon Jung ◽  
Jaeeun Ryou ◽  
Joo Yong Lee ◽  
Riyadh I AI-Raoush ◽  
Khalid Alshibli ◽  
...  
Keyword(s):  
Gas Hydrates ◽  
Gas Hydrate ◽  
Production Efficiency ◽  
Gas Permeability ◽  
Gas Production ◽  
Production Methods ◽  
Injection Method ◽  
Development Organization ◽  
Replacement Method ◽  
Hydrate Saturation

<p>Gas hydrates are potential energy resources which can be formed at low temperature and high pressure. The number of recoverable gas hydrates are limited due to the specific temperature, pressure conditions and technical limitations of gas production. Various production methods have been studied around the world to overcome these technical limitations. Gas production methods from gas hydrates are divided into methods of dissociating gas hydrates and non-dissociating gas hydrates. The dissociation methods including depressurization method, thermal injection method, and chemical inhibitor injection method can decrease in effective stress of the ground due to phase conversion. On the other hand, CH<sub>4</sub>-CO<sub>2 </sub>replacement method is geomechanically stable because it does not dissociate gas hydrates. Also, CH<sub>4</sub>-CO<sub>2 </sub>replacement method has the advantage of sequestering carbon dioxide while producing methane. However, CH<sub>4</sub>-CO<sub>2</sub> replacement method has the disadvantage such as low production efficiency and understanding kinetics of gas production. In this study, soaking, gas permeability of gas hydrate layer and hydrate saturation are considered in order to promote the production efficiency of CH<sub>4</sub>-CO<sub>2</sub> replacement method. Results show that production efficiency increases with the number of soaking process, the higher gas permeability and hydrate saturation. According to the experimental results in this study, the production efficiency can be increased by considering the soaking time, procedure and selecting the proper gas hydrates site.</p><p>Acknowledgement</p><p>This work is supported by the Korea Agency for Infrastructure Technology Advancement(KAIA) grant funded by the Ministry of Land, Infrastructure and Transport (Grant 20CTAP-C152100-02). Also, it is supported by partial funding from NPRP grant # NPRP8-594-2-244 from the Qatar national research fund (a member of Qatar Foundation) and  the Ministry of Trade, Industry, and Energy (MOTIE) through the Project “Gas Hydrate Exploration and Production Study (20-1143)” under the management of the Gas Hydrate Research and Development Organization (GHDO) of Korea and the Korea Institute of Geoscience and Mineral Resources (KIGAM).</p>

THE GAS HYDRATE OF BROMOCHLORODIFLUOROMETHANE

1960 ◽  
Vol 38 (2) ◽  
pp. 208-221 ◽  
Author(s):  
D. N. Glew
Keyword(s):  
Experimental Study ◽  
Thermodynamic Functions ◽  
Gas Hydrates ◽  
Gas Hydrate ◽  
Saturation Pressure ◽  
Stoichiometric Compound ◽  
Pressure Data ◽  
Systematic Treatment ◽  
Hydrate Saturation ◽  
Thermodynamic Equations

An experimental study has been made of the saturation pressure – temperature lines of liquid bromochlorodifluoromethane, liquid bromochlorodiflucromethane – water, bromochlorodifluoromethane hydrate – water, and bromochlorodifluoromethane hydrate – ice systems, for which the characteristic equations are given. Two quadruple points for the hydrate systems have been located and solubilities of water in bromochlorodifluoromethane and bromochlorodifluoromethane in water determined. A systematic treatment of gas hydrate saturation pressure data to yield thermodynamic equations is indicated, and the thermodynamic functions for bromochlorodifluoromethane hydrate and its phase reactions are tabulated. Bromochlorodifluoromethane hydrate is shown to be a stoichiometric compound, and its thermodynamic functions are considered in relation to those of other gas hydrates.

Experimental Study on Dynamic Elastic Properties of Gas Hydrate Bearing Sediments

2012 ◽  
Vol 446-449 ◽  
pp. 1396-1399
Author(s):  
Ling Dong Li ◽  
Yuan Fang Cheng ◽  
Xiao Jie Sun
Keyword(s):  
Elastic Properties ◽  
Gas Hydrates ◽  
Gas Hydrate ◽  
Hot Spot ◽  
Confining Pressure ◽  
Measuring System ◽  
Fundamental Parameters ◽  
Hydrate Saturation ◽  
Hydrate Bearing Sediments

As a kind of emerging energy with massive reserves, natural gas hydrates are becoming the hot spot of global research. The elastic properties of gas hydrate bearing sediments (HBS) are the fundamental parameters for gas hydrates exploration and resource evaluations. As the original coring in HBS is difficult and expensive, experimental method is important to study the problem. An acoustic wave in-situ measuring system for HBS was developed. Using the in-situ method, hydrate bearing rock samples of different hydrate saturation were synthesized, of which the supersonic wave measurement was carried out under different confining pressure. According to the elasticity theory, the dynamic elastic parameters were obtained using the measured ultrasonic wave velocity. The results show that compressional and shear waves increase with the confining pressure and hydrate saturation increasing, and so the dynamic elastic modulus is.

Optimization Strategies of Production Parameters to Prevent Hydrate Reformation in Marine Gas Hydrate Production System

2021 ◽  
Author(s):  
Zheng Liu ◽  
Baojiang Sun ◽  
Zhiyuan Wang ◽  
Jianbo Zhang
Keyword(s):  
Natural Gas ◽  
Gas Hydrates ◽  
Gas Hydrate ◽  
Production System ◽  
Hydrate Formation ◽  
Gas Production ◽  
Design Parameters ◽  
Formation Condition ◽  
Transient Temperature ◽  
Marine Gas Hydrate

Abstract In recent decades, the development of natural gas hydrates has become a research hotspot of scholars all over the world. However, the decomposed gas and water in marine gas hydrate production system may regenerate gas hydrates due to the low-temperature and high-pressure environment in seafloor. In this study, a transient temperature and pressure calculating model was established to predict the risk of hydrate reformation in production pipelines during offshore natural gas hydrate development. Using the proposed model, the region of hydrate reformation in gas hydrate production wells were predicted quantitatively. Meanwhile, the hydrate reformation management strategies through optimization of production design parameters in combination with hydrate inhibitor injection were proposed and discussed in detail. The results indicate that the risk of hydrate reformation is the highest in the drainage pipeline (DP); however, the flow in gas-water mixed transportation and gas production pipelines (MTP and GPP) basically does not satisfy the hydrate formation condition. In the process of production well design, adding additional the EH and ESP can fully eliminate the hydrate reformation risk in the DP without using the hydrate inhibitor.

Review of Theory and Practice on Natural Gas Hydrate

2011 ◽  
Vol 361-363 ◽  
pp. 149-160
Author(s):  
Bing Xiang Huang ◽  
Wei Chao Xue ◽  
You Zhuang Wang ◽  
Tong Zhang
Keyword(s):  
Natural Gas ◽  
Gas Hydrate ◽  
Clean Energy ◽  
High Energy ◽  
Research Field ◽  
Theory And Practice ◽  
High Energy Density ◽  
Natural Gas Hydrate ◽  
Combustion Heat ◽  
The World

Research on Natural Gas Hydrate（NGH）is very popular in recent years. NGH is a potential, new and clean energy with the characteristics of high energy density, high combustion heat, high proven reserves, no pollution, wide distribution and shallow burial and so on. It has been identified that NGH is widely distributed in the plateau, arctic permafrost and some eligible areas in the seabed of epicontinental and continental slope all around the world. According to the research data on NGH at home and abroad, the mineralizing, formation, distribution and exploration technology of NGH are introduced as well as the NGH research status of countries in the world, including China. Many theories and techniques about the exploitation of NGH are not mature yet. Numerous problems still exist in industrial mining NGH, such as environmental, geological problems induced by mining NGH and storage and transportation problems after mining. Finally, the application and mining prospects of NGH are and prospected and summarized to provide a relatively comprehensive reference to this research field.

scholarly journals Evolution of gas hydrates accumulation in zones of submarine mud volcanoes

2019 ◽  
pp. 45-51
Author(s):  
A. L. Sobisevich ◽  
E. I. Suetnova ◽  
R. A. Zhostkov
Keyword(s):  
Mathematical Model ◽  
Numerical Modeling ◽  
Gas Hydrates ◽  
Gas Hydrate ◽  
Sedimentary Basins ◽  
Feeder Layer ◽  
Mud Volcanoes ◽  
Layer Depth ◽  
Medium Temperature ◽  
Hydrate Saturation

The article examines the processes of evolution of gas hydrate accumulations, related to submarine mud volcanoes. A mathematical model and the results of numerical modeling of the accumulation of gas hydrates in the seabed in the deep structures of underwater mud volcanoes are presented. Numerical analysis of the influence held feeder layer depth and pressure therein to the evolution of gas hydrate saturation confined to deep water mud volcanoes were performed. Modeling quantitatively showed that hydrate saturation in areas of underwater mud volcanoes is not constant and its evolution depends on the geophysical properties of the bottom medium (temperature gradient, porosity, permeability, physical properties of sediments) and the depth of the supply reservoir and pressure in it, and the rate of hydrate accumulation in tens and hundreds times the rate of hydrate accumulation in the sedimentary basins of passive continental margin.

scholarly journals Evolution of gas hydrates accumulation in zones of submarine mud volcanoes

2019 ◽  
pp. 45-51 ◽  
Author(s):  
A. L. Sobisevich ◽  
E. I. Suetnova ◽  
R. A. Zhostkov
Keyword(s):  
Mathematical Model ◽  
Numerical Modeling ◽  
Gas Hydrates ◽  
Gas Hydrate ◽  
Sedimentary Basins ◽  
Feeder Layer ◽  
Mud Volcanoes ◽  
Layer Depth ◽  
Medium Temperature ◽  
Hydrate Saturation

The article examines the processes of evolution of gas hydrate accumulations, related to submarine mud volcanoes. A mathematical model and the results of numerical modeling of the accumulation of gas hydrates in the seabed in the deep structures of underwater mud volcanoes are presented. Numerical analysis of the influence held feeder layer depth and pressure therein to the evolution of gas hydrate saturation confined to deep water mud volcanoes were performed. Modeling quantitatively showed that hydrate saturation in areas of underwater mud volcanoes is not constant and its evolution depends on the geophysical properties of the bottom medium (temperature gradient, porosity, permeability, physical properties of sediments) and the depth of the supply reservoir and pressure in it, and the rate of hydrate accumulation in tens and hundreds times the rate of hydrate accumulation in the sedimentary basins of passive continental margin.

Numerical Analysis of the Behavior of Gas Hydrate Layers After Cementing Operations

2021 ◽  
Author(s):  
Sukru Merey ◽  
Tuna Eren ◽  
Can Polat
Keyword(s):  
Numerical Simulations ◽  
Gas Hydrates ◽  
Gas Hydrate ◽  
Cement Hydration ◽  
Nankai Trough ◽  
Heat Of Hydration ◽  
Production Test ◽  
Hydrate Saturation ◽  
Gas Channeling ◽  
Heat Released

Abstract Since the 2000s, the number of gas hydrate wells (i.e., exploration wells, production test wells) has increased. Moreover, in the marine environment, gas hydrate zones are drilled in conventional hydrocarbon wells. Different than conventional hydrocarbon wells, the heat released with cement hydration cannot be ignored because gas hydrates are heat sensitive. In this study, by analyzing different cement compositions (conventional cement compositions and novel low-heat of hydration cement), it is aimed to investigate the effect of the heat of cement hydration on gas hydrate zones near the wellbore. For this purpose, numerical simulations with TOUGH+HYDRATE simulator were conducted in the conditions of the Nankai Trough gas hydrates. According to the numerical simulations in this study, if the increase in temperature in the cemented layer is above 30°C, significant gas hydrate dissociation occurs, and free gas evolved in the porous media. This might cause gas channeling and poor cement bond. The heat released with cement hydration generally affects the interval between the cemented layer and 0.25 m away from the cemented layer. Within a few days after cementing, pressure, temperature, gas hydrate saturation, and gas saturation returned to almost their original values.

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