Evolution of gas hydrates accumulation in zones of submarine mud volcanoes

2019 ◽

pp. 45-51 ◽

Cited By ~ 1

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.

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Mathematical model of a non-stationary process of accumulation of gas hydrates, confined to deep-water mud volcanoes

10.5194/egusphere-egu21-1807 ◽

2021 ◽

Author(s):

Alexey L. Sobisevich ◽

Elena I. Suetnova ◽

Ruslan A. Zhostkov

Keyword(s):

Mathematical Model ◽

Gas Hydrates ◽

Stationary Process ◽

Sedimentary Basins ◽

Physical Parameters ◽

Continental Margins ◽

Mud Volcanoes ◽

Environment Temperature ◽

Hydrate Saturation ◽

Sea Mud

Large amounts of methane hydrate locked up within marine sediments are associated to mud volcanoes. We have investigated by means of mathematical modeling the unsteady process of accumulation of gas hydrates associated with the processes of mud volcanism. A mathematical model has been developed. The system of equations of the model describes the interrelated processes of filtration of gas-saturated fluid, thermal regime and pressure, and accumulation of gas hydrates in the seabed in the zone of thermobaric stability of gas hydrates. The numerical simulation of the accumulation of gas hydrates in the seabed in the deep structures of underwater mud volcanoes has been carried out using the realistic physical parameters values. The influence of the depth of the feeding reservoir and the pressure in it on the evolution of gas hydrate accumulations associated with deep-sea mud volcanoes is quantitatively analyzed. Modeling quantitatively showed that the hydrate saturation in the zones of underwater mud volcanoes is variable and its evolution depends on the geophysical properties of the bottom environment (temperature gradient, porosity, permeability, physical properties of sediments) and the depth of the mud reservoir and pressure in it. The volume of accumulated gas hydrates depends on the duration of the non-stationary process of accumulation between eruptions of a mud volcano. The rate of hydrate accumulation is tens and hundreds times the rate of hydrate accumulation in sedimentary basins of passive continental margins.

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Mathematical model of accumulation of gas hydrates associated with deep-sea mud volcanoes

Doklady Earth Sciences ◽

10.1134/s1028334x17050282 ◽

2017 ◽

Vol 474 (1) ◽

pp. 604-606 ◽

Cited By ~ 1

Author(s):

R. A. Zhostkov ◽

A. L. Sobisevich ◽

E. I. Suetnova

Keyword(s):

Mathematical Model ◽

Gas Hydrates ◽

Deep Sea ◽

Mud Volcanoes ◽

Sea Mud

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THE GAS HYDRATE OF BROMOCHLORODIFLUOROMETHANE

Canadian Journal of Chemistry ◽

10.1139/v60-029 ◽

1960 ◽

Vol 38 (2) ◽

pp. 208-221 ◽

Cited By ~ 16

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.

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Experimental Study on Dynamic Elastic Properties of Gas Hydrate Bearing Sediments

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.446-449.1396 ◽

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.

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Soaking effects on CH4-CO2 replacement efficiency in gas hydrates

10.5194/egusphere-egu2020-2581 ◽

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

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, CH4-CO2 replacement method is geomechanically stable because it does not dissociate gas hydrates. Also, CH4-CO2 replacement method has the advantage of sequestering carbon dioxide while producing methane. However, CH4-CO2 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 CH4-CO2 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.AcknowledgementThis 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&#160; the Ministry of Trade, Industry, and Energy (MOTIE) through the Project &#8220;Gas Hydrate Exploration and Production Study (20-1143)&#8221; under the management of the Gas Hydrate Research and Development Organization (GHDO) of Korea and the Korea Institute of Geoscience and Mineral Resources (KIGAM).

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

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.201-203.413 ◽

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.

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

10.2118/205223-ms ◽

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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The study of sclerotic phenomena in a horizontal pipeline during the flow of hydrocarbon gas

Proceedings of the Mavlyutov Institute of Mechanics ◽

10.21662/uim2012.1.038 ◽

2012 ◽

Vol 9 (1) ◽

pp. 185-187

Author(s):

V.Sh. Shagapov ◽

N.G. Musakaev ◽

R.R. Urazov

Keyword(s):

Mathematical Model ◽

Natural Gas ◽

Gas Hydrates ◽

Gas Hydrate ◽

Numerical Study ◽

Hydrocarbon Gas ◽

Gas Hydrate Deposits

Based on the proposed mathematical model, a numerical study of sclerotic phenomena in a horizontal pipeline associated with sediments and gas hydrates on channel walls during the transportation of moist natural gas was carried out. Different conditions of gas transportation are considered: the pressure has a constant value at the inlet or outlet of the pipeline, or the pressure is constantly at both ends of the pipeline. The process of dissociation of gas hydrate deposits was studied when methanol was fed into the gas stream.

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