Evolving a robust approach for accurate prediction of methane hydrate formation temperature in the presence of salt inhibitor

2014 ◽  
Vol 18 ◽  
pp. 194-204 ◽  
Author(s):  
Saeed Rashid ◽  
Amir Fayazi ◽  
Behrouz Harimi ◽  
Esmaeil Hamidpour ◽  
Sajad Younesi
Keyword(s):  
Methane Hydrate ◽  
Hydrate Formation ◽  
Accurate Prediction ◽  
Formation Temperature ◽  
Robust Approach

scholarly journals Carbon Isotope Fractionation during the Formation of CO2 Hydrate and Equilibrium Pressures of 12CO2 and 13CO2 Hydrates

Molecules ◽  
2021 ◽  
Vol 26 (14) ◽  
pp. 4215
Author(s):  
Hiromi Kimura ◽  
Go Fuseya ◽  
Satoshi Takeya ◽  
Akihiro Hachikubo
Keyword(s):  
Carbon Isotope ◽  
Isotope Fractionation ◽  
Small Difference ◽  
Hydrate Formation ◽  
Formation Temperature ◽  
Carbon Isotope Fractionation ◽  
Unit Cell Size ◽  
Naturally Occurring ◽  
Three Phase ◽  
The Difference

Knowledge of carbon isotope fractionation is needed in order to discuss the formation and dissociation of naturally occurring CO2 hydrates. We investigated carbon isotope fractionation during CO2 hydrate formation and measured the three-phase equilibria of 12CO2–H2O and 13CO2–H2O systems. From a crystal structure viewpoint, the difference in the Raman spectra of hydrate-bound 12CO2 and 13CO2 was revealed, although their unit cell size was similar. The δ13C of hydrate-bound CO2 was lower than that of the residual CO2 (1.0–1.5‰) in a formation temperature ranging between 226 K and 278 K. The results show that the small difference between equilibrium pressures of ~0.01 MPa in 12CO2 and 13CO2 hydrates causes carbon isotope fractionation of ~1‰. However, the difference between equilibrium pressures in the 12CO2–H2O and 13CO2–H2O systems was smaller than the standard uncertainties of measurement; more accurate pressure measurement is required for quantitative discussion.

Carboxylate Surfactants as Efficient and Renewable Promoters for Methane Hydrate Formation

2021 ◽  
Author(s):  
Xuejian Liu ◽  
Quan Cao ◽  
Dongyan Xu ◽  
Shengjun Luo ◽  
Rongbo Guo
Keyword(s):  
Methane Hydrate ◽  
Hydrate Formation

Investigation on Methane Hydrate Formation in Water-based Drilling Fluid

2021 ◽  
Vol 35 (6) ◽  
pp. 5264-5270
Author(s):  
Yong He ◽  
Zhen Long ◽  
Jingsheng Lu ◽  
Lingli Shi ◽  
Wen Yan ◽  
...  
Keyword(s):  
Methane Hydrate ◽  
Drilling Fluid ◽  
Hydrate Formation ◽  
Water Based

scholarly journals Numerical simulation of CH4 hydrate formation in fractures

2018 ◽  
Vol 36 (5) ◽  
pp. 1279-1294 ◽  
Author(s):  
Sheng-Li Li ◽  
You-Hong Sun ◽  
Kai Su ◽  
Wei Guo ◽  
You-Hai Zhu
Keyword(s):  
Methane Hydrate ◽  
Hydrate Formation ◽  
Growth Behavior ◽  
Fractured Media ◽  
Initial Condition ◽  
Insulation Layer ◽  
Hydrate Dissociation ◽  
Fracture Size ◽  
The Media ◽  
Gas Supply

Fracture-hosted methane hydrate deposits exist at many sites worldwide. The growth behavior of CH4 hydrate in fractured media was simulated by TOUGH + HYDRATE (T + H) code. The effects of fracture size, initial condition, and salinity on the growth behavior of hydrate in fractures were investigated. In general, the hydrate layer grew from the two ends and gradually covered on the surface of the fracture. With the formation of hydrate in fractures, the temperature increased sharply since the hydrate acted as a thermal insulation layer. In longer fractures, fast growth of hydrate at the ends of the fracture led to the formation of hydrate plugs with high saturation (called as stopper). In narrower fractures, hydrate dissociation occurred in the middle of the fracture during hydrate growing in the whole fracture due to the cutoff of gas supply by the stopper at the ends. At a low initial subcooling, hydrate formed both on the surface and in the micropores of the media, which was different from that at higher subcooling. In salt solution, the formation of hydrate stopper was inhibited by the salt-removing effect of hydrate formation and the growth of hydrate was more sustainable.

The impact of mono-ethylene glycol and kinetic inhibitors on methane hydrate formation

2021 ◽  
pp. 131531
Author(s):  
Vincent W.S. Lim ◽  
Peter J. Metaxas ◽  
Michael L. Johns ◽  
Zachary M. Aman ◽  
Eric F. May
Keyword(s):  
Ethylene Glycol ◽  
Methane Hydrate ◽  
Hydrate Formation ◽  
The Impact

Kinetic analysis of dual impellers on methane hydrate formation

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Sotirios Nik Longinos ◽  
Mahmut Parlaktuna
Keyword(s):  
Power Consumption ◽  
Kinetic Analysis ◽  
Induction Time ◽  
Methane Hydrate ◽  
Formation Rate ◽  
Hydrate Formation ◽  
Mixed Flow ◽  
Pitched Blade Turbine ◽  
Decline Rate

Abstract This study investigates the effects of types of impellers and baffles on methane hydrate formation. Induction time, water conversion to hydrates (hydrate yield), hydrate formation rate and hydrate productivity are components that were estimated. The initial hydrate formation rate is generally higher with the use of Ruston turbine (RT) with higher values 28.93 × 10−8 mol/s in RT/RT with full baffle (FB) experiment, but the decline rate of hydrate formation was also high compared to up-pumping pitched blade turbine (PBTU). Power consumption is higher also in RT/RT and PBT/RT with higher value 392,000 W in PBT/RT with no baffle (NB) experiment compared to PBT/PBT and RT/PBT experiments respectively. Induction time values are higher in RT/RT experiments compared to PBT/PBT ones. Hydrate yield is always smaller when there is no baffle in all four groups of experiments while the higher values exist in experiments with full baffle. It should be noticed that PBT is the same with PBTU, since all experiments with mixed flow have upward trending.

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