Application of PHSC equation of state in prediction of gas hydrate formation condition

2012 ◽  
Vol 333 ◽  
pp. 27-37 ◽  
Author(s):  
Masood Valavi ◽  
Mohammad Reza Dehghani
Keyword(s):  
Equation Of State ◽  
Gas Hydrate ◽  
Hydrate Formation ◽  
Formation Condition ◽  
Gas Hydrate Formation

scholarly journals Thermodynamic modeling of inhibitors’ role in preventing from gas hydrate formation in the pipelines

2015 ◽  
Vol 37 ◽  
pp. 86
Author(s):  
Fateme Sadat Mosavi Kakavand ◽  
Reihaneh Asachi
Keyword(s):  
Thermodynamic Modeling ◽  
Gas Hydrate ◽  
Hydrate Formation ◽  
Formation Condition ◽  
Acentric Factor ◽  
Specific Flow ◽  
Ambient Temperatures ◽  
Gas Hydrate Formation ◽  
Thermodynamic Conditions ◽  
Two Parameters

The existence of water beside gas has led to the creation of gas hydrate formation phenomenon in these pipelines. The phenomenon causes to basic financial and operational problems in the system. For this reason, the flow purpose of the present study was to simulate the formation condition in a specific flow and thermodynamic conditions and finally to provide the best possible solution to this problem. The Van Der Waals & Plague equation was used to thermodynamic modeling in the terms of temperature and pressure and the computer coding was carried out by MATLAB software. In addition, the results of Green & Perry study were used to utilize from physical characteristics, such as critical temperature, critical pressure, acentric factor and the temperature of quadruple points of elements forming hydrate .the results of this study indicated that increasing the concentration of inhibitor in system at the specified temperature, delay the hydrate formation. Moreover, temperature rising can also increase the effect of solvents. Therefore, two parameters of ambient temperatures in hot seasons or using heaters for pipelines can reduce the risk to a minimum in critical (sensitive) points. Finally, the used model in this design which has had some changes in variables properly can see the needs and meanwhile it is usable for other similar changes by a brief change.

Thermodynamic Modelling of Gas Hydrate Formation in the Presence of Inhibitors and the Consideration of their Effect

2014 ◽  
Vol 14 (1) ◽  
pp. 45
Author(s):  
Peyman Sabzi ◽  
Saheb Noroozi
Keyword(s):  
Gas Hydrates ◽  
Gas Hydrate ◽  
Low Temperatures ◽  
Hydrate Formation ◽  
Transportation Systems ◽  
Flow Lines ◽  
Main Approach ◽  
Efficient Inhibitor ◽  
System A ◽  
Gas Hydrate Formation

Gas hydrates formation is considered as one the greatest obstacles in gas transportation systems. Problems related to gas hydrate formation is more severe when dealing with transportation at low temperatures of deep water. In order to avoid formation of Gas hydrates, different inhibitors are used. Methanol is one of the most common and economically efficient inhibitor. Adding methanol to the flow lines, changes the thermodynamic equilibrium situation of the system. In order to predict these changes in thermodynamic behavior of the system, a series of modelings are performed using Matlab software in this paper. The main approach in this modeling is on the basis of Van der Waals and Plateau's thermodynamic approach. The obtained results of a system containing water, Methane and Methanol showed that hydrate formation pressure increases due to the increase of inhibitor amount in constant temperature and this increase is more in higher temperatures. Furthermore, these results were in harmony with the available empirical data.Keywords: Gas hydrates, thermodynamic inhibitor, modelling, pipeline blockage

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