Molecular simulation of non-equilibrium methane hydrate decomposition process

2012 ◽  
Vol 44 (1) ◽  
pp. 13-19 ◽  
Author(s):  
S.Alireza Bagherzadeh ◽  
Peter Englezos ◽  
Saman Alavi ◽  
John A. Ripmeester
Keyword(s):  
Molecular Simulation ◽  
Methane Hydrate ◽  
Decomposition Process ◽  
Hydrate Decomposition ◽  
Non Equilibrium

Numerical Simulation of Methane Hydrate Dissociation in Glass Micro Channels by Depressurization

2017 ◽  
Author(s):  
Xin Wang ◽  
Weizhong Li ◽  
Minghao Yu
Keyword(s):  
Methane Hydrate ◽  
Freezing Temperature ◽  
Decomposition Process ◽  
Laboratory Scale ◽  
Dissociation Process ◽  
Hydrate Dissociation ◽  
Hydrate Decomposition ◽  
Micro Channels ◽  
Simulation Results ◽  
Production Zone

Methane hydrate has been paid considerable attention on how to exploit it by efficient and economical methods. A computer modeling approach was used to obtain more detail information during the process of methane hydrate decomposition. A comprehensive Users’ Defined Subroutine (UDS) was used in the FLUENT code to model the methane hydrate dissociation by depressurization. The kinetic model and equilibrium condition were contained in the UDS. The new UDS can model the heat and mass transfer during the decomposition process of methane hydrate. The behavior of the methane hydrate decomposition process in both laboratory-scale simulation and micro channels simulation was investigated in this paper. The laboratory-scale simulation results were compared with ones of the laboratory-scale system studied by Masuda et al. to verify the UDS. Evolutions of methane gas, water and hydrate in the cross micro channels were obtained. The phenomenon of water freezing was predicted by comparing the water temperature and freezing temperature. The results also showed that the dissociation process of gas hydrates as well as the water freezing phenomenon occur not only in the interface between hydrate layer and production zone, but also deep in the hydrate zone.

Study Advancement for Multiphase Flow and Heat and Mass Transfer Characteristics for Gas Hydrate Decomposition in South China Sea Offshore Sediment

2013 ◽  
Author(s):  
Xichong Yu ◽  
Jiafei Zhao ◽  
Weixin Pang ◽  
Gang Li ◽  
Yu Liu
Keyword(s):  
Mass Transfer ◽  
Multiphase Flow ◽  
Heat And Mass Transfer ◽  
Gas Hydrate ◽  
Flow Characteristics ◽  
Decomposition Process ◽  
Lattice Boltzmann Model ◽  
Experimental Simulation ◽  
Hydrate Decomposition ◽  
Multi Phase Flow

Gas hydrates are crystalline solids that consist of gas molecules, usually methane, surrounded by water molecules. According to the phase equilibrium characteristics of gas hydrate, there are three basic development methods, including heating, pressure decreasing and chemical injecting. The development process is actually the multi-phase flow process. Currently, there is no good commercial software used to simulate the multiphase flow, heat transmission and mass transfer in the gas hydrate decomposition process. The study is not mature, still in the development and trial stage. So in this paper, we will make a deeply study on the multi-phase flow simulation method of gas hydrate decomposition in the sediment. We try to make breakthrough in the theory and simulate method. According to the different scales, the simulation computation study of flow characteristics model has microcosmic, mesocosmic and macrocosmic scales. In this paper, mesocosmic scales is used to study for the multiphase flow, heat and mass transfer in the offshore gas hydrate decomposition process, and numerical simulation and experimental simulation are together used to study. Study advancements are shown as follows: firstly, conventional Lattice Boltzmann model is modified to new Lattice Boltzmann Model (LBM) based on sediment with gas hydrate and flow characteristics for gas hydrate decomposition, the interaction and density difference between the phases are considered, and Magnetic Resonance Imaging (MRI) visual technology is used to successfully verified to LBM methods. Secondly, contraction core reaction methods based on fractal theory is used to simulate heat and mass transfer in the offshore gas hydrate decomposition process and is successfully verified by experimental simulation for South China Sea offshore gas hydrate sediment.

scholarly journals Optimization of Methane Hydrate Recovery System from Ocean Floor (Basic Study on Hydrate Decomposition Rate)

2006 ◽  
Vol 72 (716) ◽  
pp. 901-907
Author(s):  
Ryokichi HAMAGUCHI ◽  
Hiroki YAHASHI ◽  
Yosuke MATSUKUMA ◽  
Gen INOUE ◽  
Masaki MINEMOTO ◽  
...  
Keyword(s):  
Decomposition Rate ◽  
Methane Hydrate ◽  
Ocean Floor ◽  
Basic Study ◽  
Hydrate Decomposition ◽  
Recovery System

Experimental Investigation into Methane Hydrate Decomposition during Three-Dimensional Thermal Huff and Puff

2011 ◽  
Vol 25 (4) ◽  
pp. 1650-1658 ◽  
Author(s):  
Xiao-Sen Li ◽  
Yi Wang ◽  
Gang Li ◽  
Yu Zhang ◽  
Zhao-Yang Chen
Keyword(s):  
Experimental Investigation ◽  
Methane Hydrate ◽  
Three Dimensional ◽  
Hydrate Decomposition
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