scholarly journals Phase Behavior for Pure and Mixed Gas Hydrate Systems.

2002 ◽  
Vol 12 (1) ◽  
pp. 34-39
Author(s):  
Takeshi SUGAHARA ◽  
Keisuke SUGAHARA ◽  
Kazunari OHGAKI
Keyword(s):  
Phase Behavior ◽  
Gas Hydrate ◽  
Mixed Gas

scholarly journals Phase behavior study on gas hydrates formation in gas dominant multiphase pipelines with crude oil and high CO2 mixed gas

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Jai Krishna Sahith Sayani ◽  
Srinivasa Rao Pedapati ◽  
Bhajan Lal
Keyword(s):  
Crude Oil ◽  
Phase Behavior ◽  
Gas Hydrate ◽  
Hydrate Formation ◽  
Multiphase System ◽  
Statistical Regression ◽  
Mixed Gas ◽  
Experimental Conditions ◽  
Temperature Variance ◽  
Gas Hydrate Formation

Abstract This research is focused on understanding the phase behavior of gas hydrate formation in the gas dominant multiphase pipelines containing mixed gas with high CO2, crude oil, and deionized water. The experimental conditions are in the pressure range of 3–7 MPa with water cut as 20% of the volume. Initially, the effect of high CO2 content in natural gas on the phase boundary conditions of hydrates is studied through simulation (CSMGEM software) and experiments. Later, an additional phase of crude oil was introduced, with 15% of the volume to study the multiphase system. From the experimental analysis, thermodynamic equilibrium conditions were found, and the hydrate-liquid–vapor-equilibrium (HLVE) curves were drawn. The phase behavior is comprehended by comparing the HLVE curves of pure and multiphase systems. It is found that the high CO2 content tends to promote the gas hydrate formation. Based on the results, temperature variance and enthalpy of formation were calculated for the multiphase system. With a difference of 1.32 average temperature variance, the multiphase system exhibits inhibition. A basic statistical regression model was made to predict the gas hydrate formation in multiphase transmission pipelines. This work helps in understanding the effect of a new phase on gas hydrate formation.

Dissociation Behavior of Methane−Ethane Mixed Gas Hydrate Coexisting Structures I and II

2010 ◽  
Vol 114 (35) ◽  
pp. 9456-9461 ◽  
Author(s):  
Masato Kida ◽  
Yusuke Jin ◽  
Nobuo Takahashi ◽  
Jiro Nagao ◽  
Hideo Narita
Keyword(s):  
Gas Hydrate ◽  
Mixed Gas

scholarly journals Investigation on Gas Hydrates Formation and Dissociation in Multiphase Gas Dominant Transmission Pipelines

2020 ◽  
Vol 10 (15) ◽  
pp. 5052 ◽  
Author(s):  
Sayani Jai Krishna Sahith ◽  
Srinivasa Rao Pedapati ◽  
Bhajan Lal
Keyword(s):  
Crude Oil ◽  
Phase Behavior ◽  
Gas Hydrates ◽  
Gas Hydrate ◽  
Formation Rate ◽  
Water System ◽  
Hydrate Formation ◽  
Multiphase System ◽  
Gas Hydrate Formation ◽  
Water Cut

In this work, a gas hydrate formation and dissociation study was performed on two multiphase pipeline systems containing gasoline, CO2, water, and crude oil, CO2, water, in the pressure range of 2.5–3.5 MPa with fixed water cut as 15% using gas hydrate rocking cell equipment. The system has 10, 15 and 20 wt.% concentrations of gasoline and crude oil, respectively. From the obtained hydrate-liquid-vapor-equilibrium (HLVE) data, the phase diagrams for the system are constructed and analyzed to represent the phase behavior in the multiphase pipelines. Similarly, induction time and rate of gas hydrate formation studies were performed for gasoline, CO2, and water, and crude oil, CO2, water system. From the evaluation of phase behavior based on the HLVE curve, the multiphase system with gasoline exhibits an inhibition in gas hydrates formation, as the HLVE curve shifts towards the lower temperature and higher-pressure region. The multiphase system containing the crude oil system shows a promotion of gas hydrates formation, as the HLVE curve shifted towards the higher temperature and lower pressure. Similarly, the kinetics of hydrate formation of gas hydrates in the gasoline system is slow. At the same time, crude oil has a rapid gas hydrate formation rate.

Mixed gas hydrate structures at the Chapopote Knoll, southern Gulf of Mexico

2010 ◽  
Vol 299 (1-2) ◽  
pp. 207-217 ◽  
Author(s):  
Stephan A. Klapp ◽  
M. Mangir Murshed ◽  
Thomas Pape ◽  
Helmut Klein ◽  
Gerhard Bohrmann ◽  
...  
Keyword(s):  
Gulf Of Mexico ◽  
Gas Hydrate ◽  
Mixed Gas ◽  
Southern Gulf Of Mexico

Dissociation behavior of pellet shaped mixed gas hydrate samples that contain propane as a guest

2006 ◽  
Vol 47 (15-16) ◽  
pp. 2491-2498 ◽  
Author(s):  
Taro Kawamura ◽  
Yasuhide Sakamoto ◽  
Michika Ohtake ◽  
Yoshitaka Yamamoto ◽  
Takeshi Komai ◽  
...  
Keyword(s):  
Gas Hydrate ◽  
Mixed Gas

scholarly journals Gas Hydrate Combustion in Five Method of Combustion Organization

Entropy ◽  
2020 ◽  
Vol 22 (7) ◽  
pp. 710
Author(s):  
Sergey Y. Misyura ◽  
Andrey Yu. Manakov ◽  
Galina S. Nyashina ◽  
Olga S. Gaidukova ◽  
Vladimir S. Morozov ◽  
...  
Keyword(s):  
Gas Hydrates ◽  
Gas Hydrate ◽  
Thick Layer ◽  
Combustion Products ◽  
Dissociation Rate ◽  
Powder Layer ◽  
Muffle Furnace ◽  
Mixed Gas ◽  
Harmful Emissions ◽  
Burning Coal

Experiments on the dissociation of a mixed gas hydrate in various combustion methods are performed. The simultaneous influence of two determining parameters (the powder layer thickness and the external air velocity) on the efficiency of dissociation is studied. It has been shown that for the mixed hydrate, the dissociation rate under induction heating is 10–15 times higher than during the burning of a thick layer of powder, when the combustion is realized above the layer surface. The minimum temperature required for the initiation of combustion for different combustion methods was studied. As the height of the sample layer increases, the rate of dissociation decreases. The emissions of NOx and CO for the composite hydrate are higher than for methane hydrate at the same temperature in a muffle furnace. A comparison of harmful emissions during the combustion of gas hydrates with various types of coal fuels is presented. NOx concentration as a result of the combustion of gas hydrates is tens of times lower than when burning coal fuels. Increasing the temperature in the muffle furnace reduces the concentration of combustion products of gas hydrates.

Thermodynamic Stability of H2+ Tetrahydrofuran Mixed Gas Hydrate in Nonstoichiometric Aqueous Solutions

2007 ◽  
Vol 52 (2) ◽  
pp. 517-520 ◽  
Author(s):  
Shunsuke Hashimoto ◽  
Takeshi Sugahara ◽  
Hiroshi Sato ◽  
Kazunari Ohgaki
Keyword(s):  
Aqueous Solutions ◽  
Thermodynamic Stability ◽  
Gas Hydrate ◽  
Mixed Gas

Dual-functional gas hydrate inhibition of tetramethylammonium chloride for carbon dioxide-methane mixed gas systems

Fuel ◽  
2021 ◽  
Vol 305 ◽  
pp. 121598
Author(s):  
Iqbal Ahmed Moujdin ◽  
Muhammad Saad Khan ◽  
Bhajan Lal ◽  
Hani Abdullah Abulkhair ◽  
Abdulmohsen Alsaiari
Keyword(s):  
Carbon Dioxide ◽  
Gas Hydrate ◽  
Mixed Gas ◽  
Dual Functional ◽  
Tetramethylammonium Chloride

scholarly journals Influence of Gas Supply Changes on the Formation Process of Complex Mixed Gas Hydrates

Molecules ◽  
2021 ◽  
Vol 26 (10) ◽  
pp. 3039
Author(s):  
Mengdi Pan ◽  
Judith M. Schicks
Keyword(s):  
Gas Hydrates ◽  
Gas Hydrate ◽  
Formation Process ◽  
Gas Flow ◽  
Hydrate Formation ◽  
Experimental Investigations ◽  
Gas Composition ◽  
Mixed Gas ◽  
Hydrate Phase ◽  
Gas Supply

Natural gas hydrate occurrences contain predominantly methane; however, there are increasing reports of complex mixed gas hydrates and coexisting hydrate phases. Changes in the feed gas composition due to the preferred incorporation of certain components into the hydrate phase and an inadequate gas supply is often assumed to be the cause of coexisting hydrate phases. This could also be the case for the gas hydrate system in Qilian Mountain permafrost (QMP), which is mainly controlled by pores and fractures with complex gas compositions. This study is dedicated to the experimental investigations on the formation process of mixed gas hydrates based on the reservoir conditions in QMP. Hydrates were synthesized from water and a gas mixture under different gas supply conditions to study the effects on the hydrate formation process. In situ Raman spectroscopic measurements and microscopic observations were applied to record changes in both gas and hydrate phase over the whole formation process. The results demonstrated the effects of gas flow on the composition of the resulting hydrate phase, indicating a competitive enclathration of guest molecules into the hydrate lattice depending on their properties. Another observation was that despite significant changes in the gas composition, no coexisting hydrate phases were formed.

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