Heat Transfer in Gas Hydrate Bearing Sandstones

2018 ◽  
pp. 25-32
Author(s):  
Zhiqiang Liu ◽  
Linlin Wang ◽  
Guangqing Zhang
Keyword(s):  
Heat Transfer ◽  
Gas Hydrate

Gas hydrate fast nucleation from melting ice and quiescent growth along vertical heat transfer tube

2005 ◽  
Vol 48 (1) ◽  
pp. 75-82 ◽  
Author(s):  
Yingming Xie ◽  
Kaihua Guo ◽  
Deqing Liang ◽  
Shuanshi Fan ◽  
Jianming Gu ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Gas Hydrate ◽  
Heat Transfer Tube ◽  
Transfer Tube ◽  
Vertical Heat

scholarly journals Numerical Investigation into the Development Performance of Gas Hydrate by Depressurization Based on Heat Transfer and Entropy Generation Analyses

Entropy ◽  
2020 ◽  
Vol 22 (11) ◽  
pp. 1212 ◽  
Author(s):  
Bo Li ◽  
Wen-Na Wei ◽  
Qing-Cui Wan ◽  
Kang Peng ◽  
Ling-Ling Chen
Keyword(s):  
Heat Transfer ◽  
Energy Loss ◽  
Entropy Production ◽  
Entropy Generation ◽  
Gas Hydrate ◽  
Methane Hydrate ◽  
Dynamic Properties ◽  
Entropy Production Rate ◽  
Entropy Flow ◽  
Hydrate Reservoir

The purpose of this study is to analyze the dynamic properties of gas hydrate development from a large hydrate simulator through numerical simulation. A mathematical model of heat transfer and entropy production of methane hydrate dissociation by depressurization has been established, and the change behaviors of various heat flows and entropy generations have been evaluated. Simulation results show that most of the heat supplied from outside is assimilated by methane hydrate. The energy loss caused by the fluid production is insignificant in comparison to the heat assimilation of the hydrate reservoir. The entropy generation of gas hydrate can be considered as the entropy flow from the ambient environment to the hydrate particles, and it is favorable from the perspective of efficient hydrate exploitation. On the contrary, the undesirable entropy generations of water, gas and quartz sand are induced by the irreversible heat conduction and thermal convection under notable temperature gradient in the deposit. Although lower production pressure will lead to larger entropy production of the whole system, the irreversible energy loss is always extremely limited when compared with the amount of thermal energy utilized by methane hydrate. The production pressure should be set as low as possible for the purpose of enhancing exploitation efficiency, as the entropy production rate is not sensitive to the energy recovery rate under depressurization.

Heat transfer during gas hydrate formation in gas-liquid slug flow

1996 ◽  
Vol 31 (3) ◽  
pp. 179-183 ◽  
Author(s):  
T. Elperin ◽  
A. Fominykh
Keyword(s):  
Heat Transfer ◽  
Gas Hydrate ◽  
Slug Flow ◽  
Hydrate Formation ◽  
Liquid Slug ◽  
Gas Hydrate Formation

Simulation of Gas-Hydrate Slurry Stratified Flow With Inward and Outward Hydrate Growth Model

2016 ◽  
Author(s):  
Bohui Shi ◽  
Yang Liu ◽  
Lin Ding ◽  
Xiaofang Lv ◽  
Jing Gong
Keyword(s):  
Heat Transfer ◽  
Mass Transfer ◽  
Liquid Phase ◽  
Shell Model ◽  
Gas Hydrate ◽  
Hydrodynamic Model ◽  
Formation Rate ◽  
Hydrate Formation ◽  
Phase Flow ◽  
Two Phase

The topic of hydrate formation and blocking in offshore petroleum industry has attracted more and more attentions, which is known as one of the flow assurance issues. A new technology has been proposed to avoid the occurrence of hydrate blockage in multiphase transportation system, which is hydrate slurry flow technology, also named as cold flow technology. The low dosage hydrate inhibitor of anti-agglomerate was added into the flow systems to allow hydrate formation in the liquid phase while it prevented the aggregation of hydrate particles. Thus these particles were evacuated with the liquid phase as pseudo-fluid like slurry. In this work, an inward and outward hydrate growth shell model coupled with two phase flow hydrodynamic model was applied to investigate the characteristics of gas-hydrate slurry stratified flow. The inward and outward hydrate growth shell model considered the kinetics, mass transfer and heat transfer process of hydrate formation, which could predict the hydrate formation rate and the released heat. The two phase flow hydrodynamic model included mass, momentum and energy equations. A case for an inclined pipeline was simulated using the combined models. The results showed that once the kinetic requirements for hydrate crystallization was satisfied, hydrates would form quickly at the initial stage and then hydrate formation rate would decrease obviously due to the limitation of mass transfer and heat transfer. Meanwhile, the flow characteristics, such as the liquid holdup and pressure drop, were predicted by the model, which also provided an acceptable results about the state of hydrates (onset time of formation, formation rate, volume fraction, etc.) in multiphase system for the operation engineers in the field. The key parameters of the inward and outward hydrate growth shell model were determined by referring to the literatures. To investigate the reliability and influence of these set values on the results, a sensitivity analysis of the key parameters of the shell model was implemented. Further works should be done, such as the flow mechanism in other flow regimes as well as the influence of particle aggregation.

scholarly journals Heat Transfer Related to Gas Hydrate Formation/Dissociation

10.5772/19711 ◽  
2011 ◽  
Author(s):  
Bei Liu ◽  
Weixin Pang ◽  
Baozi Peng ◽  
Changyu Sun ◽  
Guangjin Che
Keyword(s):  
Heat Transfer ◽  
Gas Hydrate ◽  
Hydrate Formation ◽  
Gas Hydrate Formation

Heat Transfer During Gas Hydrate Film Formation on Gas-Liquid Interface

2010 ◽  
Author(s):  
Ni Liu ◽  
Xinping Ouyang ◽  
Ju Li ◽  
Daoping Liu
Keyword(s):  
Heat Transfer ◽  
Temperature Distribution ◽  
Gas Hydrates ◽  
Gas Hydrate ◽  
Film Formation ◽  
Formation Rate ◽  
Liquid Interface ◽  
Effect Of Temperature ◽  
Static System ◽  
Hydrate Film

Gas hydrates are solid, crystalline, ice-like compounds composed of water and guest molecules. The formation of gas hydrates is a complex process with heat and mass transfer in gas, liquid and solid. Increasing the hydrates formation rate and the storage capacity, reducing hydrate induction time are main technical barriers for the application of gas hydrate. A one-dimensional numerical model of heat transfer during gas hydrate film formation on gas-liquid interface is investigated by analyzing the process of static system. According to the rate of gas consumed, the relation between the thickness of hydrate film and time can be obtained. The temperature distribution of different phase in the system is analyzed and the effect of temperature distribution of water is confirmed. The result indicates that it is effective to accelerate the rate of hydrate formation by enhancing the heat transfer in water phase.

scholarly journals Study on Enhanced Heat Transfer of the Gas Hydrate Storage Tank in the Cool Storage Process

2015 ◽  
Vol 121 ◽  
pp. 1076-1082 ◽  
Author(s):  
Zibiao Wang ◽  
Tingting Fan ◽  
Wei Xiong ◽  
Fengxue Li ◽  
Bo Yang
Keyword(s):  
Heat Transfer ◽  
Gas Hydrate ◽  
Storage Tank ◽  
Storage Process ◽  
Enhanced Heat Transfer ◽  
Cool Storage
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