Dynamics investigation on methane hydrate formation process with combined promotion methods

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Yuanxia Wei ◽  
Jing Bai ◽  
Junhao Xu ◽  
Chaoyue Zhang ◽  
Gengbiao Xie ◽  
...  
Keyword(s):  
Rate Constant ◽  
Methane Hydrate ◽  
Consumption Rate ◽  
Formation Rate ◽  
Sodium Dodecyl ◽  
Hydrate Formation ◽  
Maximum Value ◽  
Combination System ◽  
Gas Consumption ◽  
Better Than

Abstract Rapid generation of natural gas hydrates is the basis for the application of hydrate storage and transportation. In this work, the kinetic parameters of methane hydrate formation (gas consumption, gas consumption rate constant and reaction space velocity) both in the liquid continuous impinging stream (LIS) system and sodium dodecyl sulfate (SDS) + water and LIS combination system were investigated in a liquid-continuous impinging stream reactor. The gas consumption rate constant was 3.40 × 10−8 mol2 s−1 J−1 without the impinging stream, while it increased with the increase of impinging strength and reached the maximum value of 3.68 × 10−8 mol2 s−1 J−1 when the impinging strength was 0.21. In the SDS + water and LIS combination system, when the SDS concentration was 600 mg/L, the maximum gas consumption rate constant was 3.99 × 10−8 mol2 s−1 J−1 without the impinging stream, while it reached the maximum value of 4.61 × 10−8 mol2 s−1 J−1 when the impinging strength was 0.38. The results showed that the impinging stream can effectively promote the formation rate of methane hydrate, and single mechanical promotion was better than non-promoting mode but combination promotion methods was better than single mechanical promotion.

Research of Surfactants Effect on Methane Hydrate Formation with Properties of Biochemical Materials

2013 ◽  
Vol 675 ◽  
pp. 284-288 ◽  
Author(s):  
Bin Dou ◽  
Hui Gao ◽  
Lei Ren
Keyword(s):  
Sodium Dodecyl Sulfate ◽  
Methane Hydrate ◽  
Pure Water ◽  
Sodium Dodecyl ◽  
Water System ◽  
Hydrate Formation ◽  
Liquid Pool ◽  
Pool Surface ◽  
Dodecyl Sulfate ◽  
Gas Consumption

This paper deals with the effects of a surfactant additive on the formation of methane hydrate in water system with and without sodium dodecyl sulfate (SDS). The properties of sodium dodecyl sulfate are listed. The results manifested that the presence of SDS could not only accelerate the hydrate formation process, but also increase the partition coefficient of methane between hydrate and vapor drastically. The paper then describes our experimental observations of the hydrate formation from methane, to show how the hydrate formation behaviors are affected by the additives of chamber partially filled with a quiescent pool of water (pure water or an aqueous SDS solution) to compensate for the gas consumption due to the hydrate formation, thereby maintaining a constant pressure inside the chamber. The results revealed that the addition of SDS not only on the liquid-pool surface but also on the chamber walls above the level of the pool surface, leaving the bulk of the liquid pool free from hydrate crystals. An excessive addition of SDS beyond the solubility was found to cause a decrease in the rate of hydrate formation but an increase in the final level of the water-to-hydrate conversion.

scholarly journals Influence of THF and THF/SDS on the Kinetics of CO2 Hydrate Formation Under Stirring

2021 ◽  
Vol 9 ◽  
Author(s):  
Hongliang Wang ◽  
Qiang Wu ◽  
Baoyong Zhang
Keyword(s):  
Induction Time ◽  
Pure Water ◽  
Formation Rate ◽  
Sodium Dodecyl ◽  
Hydrate Formation ◽  
Gas Absorption ◽  
Obvious Effect ◽  
Gas Uptake ◽  
Gas Consumption ◽  
And Control

Hydrate-based gas separation is a potential technology for CO2 recovery and storage, and its products can be used for fire prevention and control in mines. Promoters are often employed to accelerate or moderate hydrate formation. In this study, experiments were performed to examine the effects of different concentrations of the thermodynamic promoter tetrahydrofuran (THF) and kinetic promoter sodium dodecyl sulphate (SDS) on CO2 hydrate formation under stirring. The results showed that THF significantly shortens the induction time of CO2 hydrates; however, because THF occupies a large cavity in the hydrate structure, it also reduces the gas absorption and hydrate formation rate. SDS has no obvious effect on the induction time of hydrates, but it can increase the gas storage density and hydrate formation rate. Using THF and SDS together consumed more CO2 than using THF alone or pure water. The peak gas consumption rate was 2.3 times that of the THF system. The hydrate formation efficiency was improved by including both THF and SDS, which maximized both the hydrate formation rate and total gas uptake.

Estimation of the Formation Rate Constant of Methane Hydrate in Porous Media

SPE Journal ◽  
2013 ◽  
Vol 19 (02) ◽  
pp. 184-190 ◽  
Author(s):  
Ayako Fukumoto ◽  
Toru Sato ◽  
Fumio Kiyono ◽  
Shinichiro Hirabayashi
Keyword(s):  
Porous Media ◽  
Rate Constant ◽  
Methane Hydrate ◽  
Homogeneous Nucleation ◽  
History Matching ◽  
Formation Rate ◽  
Hydrate Formation ◽  
Computational Domain ◽  
Formation Experiment ◽  
Heat Transfers

Summary Hydrate formation and the relevant mass and heat transfers were numerically analyzed in a microscopic computational domain in which spherical glass beads, water, and methane gas were distributed separately. A hydrate-formation experiment was also carried out by use of a cylindrical pressure cell. The temperature in the cell was controlled by Peltier devices, which were attached to the outer walls of the cell to imitate the adiabatic boundary condition present in the numerical simulation. By history matching between the experiment and calculation, we first obtained a hydrate-formation rate constant per unit volume of water, assuming homogeneous nucleation. Then, after converting the rate by use of a surface-area model of water in porous media, we noted that the area-based rate constant and activation energy of the hydrate formation were estimated to be 6.33 × 1034 mol·m–2 Pa–1 s–1 and 238 × 103 J/mol, respectively, for temperatures of 1.5 to 3.4°C.

scholarly journals Methane hydrate formation behaviors in high water-cut oil-in-water systems with hydrate promoters

RSC Advances ◽  
2021 ◽  
Vol 11 (49) ◽  
pp. 30597-30609
Author(s):  
Yan Kele ◽  
Ren Yuemeng ◽  
Lv Cheng ◽  
Xiao Anshan ◽  
Lv Xiaofang
Keyword(s):  
Methane Hydrate ◽  
Formation Rate ◽  
Hydrate Formation ◽  
High Water ◽  
Water Systems ◽  
Oil In Water ◽  
Two Systems ◽  
Gas Consumption ◽  
High Water Cut ◽  
Water Cut

The gas consumption was the highest in both systems (0.5% Span20 +0.05% SDS) and (0.5% Span20 + 0.5% l-l), indicating that the two systems had a faster hydrate formation rate.

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.

Experimental Investigation of Methane Hydrate Formation in the Carboxmethylcellulose (CMC) Aqueous Solution

SPE Journal ◽  
2020 ◽  
Vol 25 (03) ◽  
pp. 1042-1056 ◽  
Author(s):  
Weiqi Fu ◽  
Zhiyuan Wang ◽  
Litao Chen ◽  
Baojiang Sun
Keyword(s):  
Aqueous Solution ◽  
Mass Transfer ◽  
Gas Hydrates ◽  
Methane Hydrate ◽  
Formation Rate ◽  
Hydrate Formation ◽  
Semiempirical Model ◽  
Stirred Reactor ◽  
Proposed Model ◽  
Wellbore Pressure

Summary In the development of deepwater crude oil, gas, and gas hydrates, hydrate formation during drilling operations becomes a crucial problem for flow assurance and wellbore pressure management. To study the characteristics of methane hydrate formation in the drilling fluid, the experiments of the methane hydrate formation in water with carboxmethylcellulose (CMC) additive are performed in a horizontal flow loop under flow velocity from 1.32 to 1.60 m/s and CMC concentration from 0.2 to 0.5 wt%. The flow pattern is observed as bubbly flow in experiments. The experiments indicate that the increase of CMC concentration impedes the hydrate formation while the increase of liquid velocity enhances formation rates. In the stirred reactor, the hydrate formation rate generally decreases as the subcooling condition decreases. However, in this work, with the subcooling condition continuously decreasing, hydrate formation rate follows a “U” shaped trend—initially decreasing, then leveling out and finally increasing. It is because the hydrate formation rate in this work is influenced by multiple factors, such as hydrate shell formation, fracturing, sloughing, and bubble breaking up, which has more complicated mass transfer procedure than that in the stirred reactor. A semiempirical model that is based on the mass transfer mechanism is developed for current experimental conditions, and can be used to predict the formation rates of gas hydrates in the non-Newtonian fluid by replacing corresponding correlations. The rheological experiments are performed to obtain the rheological model of the CMC aqueous solution for the proposed model. The overall hydrate formation coefficient in the proposed model is correlated with experimental data. The hydrate formation model is verified and the predicted quantity of gas hydrates has a discrepancy less than 10%.

Effects of Cyclodextrin Solutions on Methane Hydrate Formation

2007 ◽  
Author(s):  
Ryo Nozawa ◽  
Mohammad Ferdows ◽  
Kazuhiko Murakami ◽  
Masahiro Ota
Keyword(s):  
Raman Spectroscopy ◽  
Induction Time ◽  
Methane Hydrate ◽  
Methane Concentration ◽  
Formation Rate ◽  
Hydrate Formation ◽  
Formation Water ◽  
Advanced Method

In this paper, we suggest the advanced method of methane hydrate formation by cyclodextrin solutions. The structures of the methane hydrate were experimentally investigated by Raman spectroscopy. The induction time of the methane hydrate formation becomes by shorter 10–30 times and formation rate become by faster 2–4 times originated in the increased methane concentration of hydrate formation water by adding cyclodextrins. The results by the Raman spectroscopy indicate that the structure I methane hydrate is produced and methane molecules exist in both Large and Small cages.

scholarly journals Geomechanical effects of carbon sequestration as CO2 hydrates and CO2-N2 hydrates on host submarine sediments

2020 ◽  
Vol 205 ◽  
pp. 11003
Author(s):  
Shuman Yu ◽  
Shun Uchida
Keyword(s):  
Carbon Sequestration ◽  
Methane Hydrate ◽  
Formation Rate ◽  
Hydrate Formation ◽  
Small Deformation ◽  
Storage Efficiency ◽  
The Past ◽  
Single Well ◽  
And Storage ◽  
Hydrate Formation Process

Over the past 10 years, more than 300 trillion kg of carbon dioxide (CO2) have been emitted into the atmosphere, deemed responsible for climate change. The capture and storage of CO2 has been therefore attracting research interests globally. CO2 injection in submarine sediments can provide a way of CO2 sequestration as solid hydrates in sediments by reacting with pore water. However, CO2 hydrate formation may occur relatively fast, resulting decreasing CO2 injectivity. In response, nitrogen (N2) addition has been suggested to prevent potential blockage through slower CO2-N2 hydrate formation process. Although there have been studies to explore this technique in methane hydrate recovery, little attention is paid to CO2 storage efficiency and geomechanical responses of host marine sediments. To better understand carbon sequestration efficiency via hydrate formation and related sediment geomechanical behaviour, this study presents numerical simulations for single well injection of pure CO2 and CO2-N2 mixture into submarine sediments. The results show that CO2-N2 mixture injection improves the efficiency of CO2 storage while maintaining relatively small deformation, which highlights the importance of injectivity and hydrate formation rate for CO2 storage as solid hydrates in submarine sediments.

Formation Kinetics and Self-Preservation of CO2 Hydrates in the Presence of Carboxylated Multiwall Carbon Nanotubes

2021 ◽  
Author(s):  
Khalik Mohamad Sabil ◽  
Omar Nashed ◽  
Bhajan Lal ◽  
Khor Siak Foo
Keyword(s):  
Gas Hydrate ◽  
Induction Time ◽  
Completion Time ◽  
Formation Rate ◽  
Sodium Dodecyl ◽  
Hydrate Formation ◽  
Significant Finding ◽  
Formation Kinetic ◽  
Gas Hydrate Formation ◽  
The Impact

Abstract Nanofluids are known of having the capability to increase heat and mass transfer and their suitability to be used as kinetic gas hydrate promoters have been recently investigated. They have favorable properties such as high thermal conductivity, large surface area, recyclable, ecofriendly, and relatively cheap that are favorable for kinetic gas hydrate promoters. However, the nanomaterials face challenges related to their stability in the base fluid. Therefore, it is crucial to investigate the impact of surfactant free nanofluid on hydrate formation and dissociation kinetics. In this work, COOH-MWCNT suspended in water is used to study the effect of surfactant free nanofluid on CO2 hydrates formation kinetic and stability. Kinetic study on CO2 hydrates formation as well as self-preservation are conducted in a stirred tank reactor. The kinetic experiments are carried out at 2.7 MPa and 274.15 K. The induction time, initial gas consumption rate, half-completion time t50, semi completion time t95 are measured to evaluate the effect of COOH-MWCNT. Furthermore, the dissociation rate was calculated to assess the impact of COOH-MWCNT on self-preservation at 271.15 K and atmospheric pressure. The results are compared with that of sodium dodecyl sulphate (SDS). The study of CO2 hydrates formation kinetic shows that the induction time is not affected by COOH-MWCNT. The impact of nanofluid is more pronounced during the hydrate growth. The initial formation rate is the highest at 0.01 wt% of COOH-MWCNT whereas 0.01 and 0.03 wt% shows the same and shortest t50. However, t95 found to be decreased with increasing the concentration. The effect of COOH-MWCNT is attributed to the strong functional group. Self-preservation results shows CO2 hydrates are less stable in the presence of COOH-MWCNT. The result of this work may provide significant finding that can be used to developed kinetic gas hydrate promoter based on nanofluid that work better than SDS to eliminate gas hydrate formation in oil and gas pipeline.

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