Experimental study of natural gas hydrates and a novel use of neural network to predict hydrate formation conditions

2013 ◽  
Vol 91 (2) ◽  
pp. 264-273 ◽  
Author(s):  
Mohammad Ghavipour ◽  
Mina Ghavipour ◽  
Minoo Chitsazan ◽  
Seyed Hessam Najibi ◽  
Saeed Shiry Ghidary
Keyword(s):  
Neural Network ◽  
Experimental Study ◽  
Natural Gas ◽  
Gas Hydrates ◽  
Hydrate Formation ◽  
Natural Gas Hydrates ◽  
Formation Conditions

scholarly journals The use of sodium chloride as strategy for improving CO2/CH4 replacement in natural gas hydrates promoted with depressurization methods

2020 ◽  
Vol 13 (18) ◽  
Author(s):  
Alberto Maria Gambelli ◽  
Federico Rossi
Keyword(s):  
Carbon Dioxide ◽  
Sodium Chloride ◽  
Natural Gas ◽  
Gas Hydrates ◽  
Hydrate Formation ◽  
Free Water ◽  
Process Efficiency ◽  
Natural Gas Hydrates ◽  
Replacement Process ◽  
Permanent Storage

Abstract Natural gas hydrates represent a valid opportunity in terms of energy supplying, carbon dioxide permanent storage and climate change contrast. Research is more and more involved in performing CO2 replacement competitive strategies. In this context, the inhibitor effect of sodium chloride on hydrate formation and stability needs to be investigated in depth. The present work analyses how NaCl intervenes on CO2 hydrate formation, comparing results with the same typology of tests carried out with methane, in order to highlight the influence that salt produced on hydrate equilibrium conditions and possibilities which arise from here for improving the replacement process efficiency. Sodium chloride influence was then tested on five CO2/CH4 replacement tests, carried out via depressurization. In relation with the same typology of tests, realised in pure demineralised water and available elsewhere in literature, three main differences were found. Before the replacement phase, CH4 hydrate formation was particularly contained; moles of methane involved were in the range 0.059–0.103 mol. On the contrary, carbon dioxide moles entrapped into water cages were 0.085–0.206 mol or a significantly higher quantity. That may be justified by the greater presence of space and free water due to the lower CH4 hydrate formation, which led to a more massive new hydrate structure formation. Moreover, only a small part of methane moles remained entrapped into hydrates after the replacement phase (in the range of 0.023–0.042 mol), proving that, in presence of sodium chloride, CO2/CH4 exchange interested the greater part of hydrates. Thus, the possibility to conclude that sodium chloride presence during the CO2 replacement process provided positive and encouraging results in terms of methane recovery, carbon dioxide permanent storage and, consequently, replacement process efficiency.

Experimental study of the formation of natural gas hydrates in the presence of NaCl and KCl

2019 ◽  
Vol 37 (17) ◽  
pp. 1924-1930 ◽  
Author(s):  
Hooshang Piramoon ◽  
Mostafa Keshavarz Moraveji ◽  
Arsalan Parvareh ◽  
Alireza Azimi
Keyword(s):  
Experimental Study ◽  
Natural Gas ◽  
Gas Hydrates ◽  
Natural Gas Hydrates

scholarly journals Simulation of Thermal Characteristics of Field Trails and Verification of Formation Conditions of Natural Gas Hydrates

2019 ◽  
Vol 124 (5) ◽  
pp. 47-52
Author(s):  
A. V. Bunyakin ◽  
◽  
A. A. Paranuk ◽  
S. A. Mamiy ◽  
M. V. Keshokov ◽  
...  
Keyword(s):  
Natural Gas ◽  
Gas Hydrates ◽  
Thermal Characteristics ◽  
Natural Gas Hydrates ◽  
Formation Conditions

scholarly journals Controlled Production of Natural Gas Hydrates in an Experimental Device with an Internal Circulation Circuit

2021 ◽  
Vol 12 (1) ◽  
pp. 312
Author(s):  
Dávid Hečko ◽  
Milan Malcho ◽  
Pavol Mičko ◽  
Nikola Čajová Kantová ◽  
Zuzana Kolková ◽  
...  
Keyword(s):  
Natural Gas ◽  
Gas Hydrates ◽  
Gas Hydrate ◽  
Energy Intensity ◽  
Hydrate Formation ◽  
Experimental Device ◽  
Natural Gas Hydrate ◽  
Hydrocarbon Gases ◽  
Natural Gas Hydrates ◽  
Circulation Circuit

For countries with limited access to conventional hydrocarbon gases, methane hydrates have emerged as a potential energy source. In view of the European Union’s requirements to reduce the energy intensity of technological processes and increase energy security, it appears promising to accumulate natural gas and biomethane in the form of hydrate structures and release them if necessary. Storing gas in this form in an energy-efficient manner creates interest in developing and innovating technologies in this area. Hydrates that form in gas pipelines are generated by a more or less random process and are an undesirable phenomenon in gas transportation. In our case, the process implemented in the proposed experimental device is a controlled process, which can generate hydrates in orders of magnitude shorter times compared to the classical methods of generating natural gas hydrates in autoclaves by saturating water only. The recirculation of gas-saturated water has been shown to be the most significant factor in reducing the energy consumption of natural gas hydrate generation. Not only is the energy intensity of generation reduced, but also its generation time. In this paper, a circuit diagram for an experimental device for natural gas hydrate generation is shown with complete description, principle of operation, and measurement methodology. The natural gas hydrate formation process is analyzed using a mathematical model that correlates well with the measured hydrate formation times. Hydrates may become a current challenge in the future and, once verified, may find applications in various fields of technology or industry.

Prediction of natural gas hydrates formation using a combination of thermodynamic and neural network modeling

2019 ◽  
Vol 182 ◽  
pp. 106270 ◽  
Author(s):  
Noura Rebai ◽  
Ahmed Hadjadj ◽  
Abdelbaki Benmounah ◽  
Abdallah S. Berrouk ◽  
Salim M. Boualleg
Keyword(s):  
Neural Network ◽  
Natural Gas ◽  
Gas Hydrates ◽  
Network Modeling ◽  
Neural Network Modeling ◽  
Natural Gas Hydrates

Design and Experimental Study of the Steam Mining System for Natural Gas Hydrates

2012 ◽  
Vol 26 (12) ◽  
pp. 7280-7287 ◽  
Author(s):  
You-hong Sun ◽  
Rui Jia ◽  
Wei Guo ◽  
Yong-qin Zhang ◽  
You-hai Zhu ◽  
...  
Keyword(s):  
Experimental Study ◽  
Natural Gas ◽  
Gas Hydrates ◽  
Mining System ◽  
Natural Gas Hydrates
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