Dual inhibition effects of diamines on the formation of methane gas hydrate and their significance for natural gas production and transportation

Lim, Jiyeon; Kim, Eunae; Seo, Yongwon

doi:10.1016/j.enconman.2016.07.054

Cited by 27 publications

(10 citation statements)

References 46 publications

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“…7−9 A common approach in industry to prevent hydrates is shifting the hydrate phase boundary through the addition of thermodynamic hydrate inhibitors (THIs), such as methanol or monoethylene glycol. 10,11 Considering the large amounts of consumption and high expenses of THIs, injection of the low-dosage hydrate inhibitors has become an alternative approach, such as antiagglomerants and kinetic hydrate inhibitors (KHIs). 10−12 There is increasing interest in risk control strategies, such as allowing hydrate particles to disperse in the bulk phase, instead of eliminating them fully.…”

Section: Introductionmentioning

confidence: 99%

Nucleation and Growth of Gas Hydrates in Emulsions of Water in Asphaltene-Containing Oils

Zhang

Huang

et al. 2021

Energy Fuels

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Asphaltenes in crude oils may affect hydrate formation in water–oil emulsions, complicating flow assurance and hydrate management in subsea oil–gas multiphase pipelines. In this study, the effects of asphaltenes on hydrate nucleation and growth in water-in-oil emulsions were investigated. It was found that the presence of asphaltenes inhibited hydrate nucleation. The inhibiting effect was enhanced with the increase in asphaltene content from 0 to 0.15 wt % and then was lowered with further increase in asphaltene content from 0.15 to 0.30 wt %. The asphaltenes were found to decrease the formed amount of hydrates. In addition, the effects of water cut, stirring rate, and reformation process on hydrate formation in asphaltene-containing emulsions were studied. The results showed that the nucleation rate of hydrates decreased with a reduction in water cut. The hydrate growth rate first increased and then decreased with decrease in the water cut, which could be attributed to the combined effects of gas concentration and water amount. Furthermore, both the nucleation rate and the growth rate of hydrates were observed to increase with an increase in the stirring rate, indicating the promoting effect of a high stirring rate on hydrate formation in asphaltene-containing emulsions. Finally, it was demonstrated that hydrates nucleated more easily during the reformation process. However, the growth rate during the reformation process was lower than that in the first formation. The results from this study have potential flow assurance applications when asphaltenes and hydrates coexist in the subsea pipelines.

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Section: Introductionmentioning

confidence: 99%

Nucleation and Growth of Gas Hydrates in Emulsions of Water in Asphaltene-Containing Oils

Zhang

Huang

et al. 2021

Energy Fuels

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“…Both MD and MC methods have been used in numerous hydrate-related studies. , Nevertheless, only a limited number of these studies deals explicitly with low dosage hydrate inhibitors. Additionally, most of them are focused on kinetic inhibitors, − whereas the number of atomistic simulation studies on hydrate AAs is even smaller. − However, all the studies on AAs have been published within the last few years, showing that hydrate anti-agglomeration research based on atomistic methodologies is gaining momentum.…”

Section: Introductionmentioning

confidence: 99%

Ranking the Efficiency of Gas Hydrate Anti-agglomerants through Molecular Dynamic Simulations

et al. 2021

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Using both computational and experimental methods, the capacity of four different surfactant molecules to inhibit the agglomeration of sII hydrate particles was assessed. The computational simulations were carried out using both steered and non-steered molecular dynamics (MD), simulating the coalescence process of a hydrate slab and a water droplet, both covered with surfactant molecules. The surfactants were ranked according to free energy calculations (steered MD) and the number of agglomeration events (non-steered MD). The experimental work was based on rocking cell measurements, determining the minimum effective dose necessary to inhibit agglomeration. Overall, good agreement was obtained between the performance predicted by the simulations and the experimental measurements. Moreover, the simulations allowed us to gain additional insights that are not directly accessible via experiments, such as an analysis of the mass density profiles, the diffusion coefficients, or the orientations of the long tails.

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“…1 Thus, with the rapid increase of global energy demand, NGH is considered to be a new and potential energy on account of its enormous energy reserves. 6 At present, various innovative technologies related to NGH have been developed for industrial applications, such as water desalination, 7 energy storage and transportation, 8,9 gas separations, 2,10 and CO 2 capture and storage. 11 To realize the commercial extraction of natural gas from hydrate deposits in the future, a variety of exploitation methods have been proposed.…”

Section: Introductionmentioning

confidence: 99%

Insights into the Control Mechanism of Heat Transfer on Methane Hydrate Dissociation via Depressurization and Wellbore Heating

Wan

Peng

et al. 2020

Ind. Eng. Chem. Res.

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The dissociation of natural gas hydrate is an endothermic reaction controlled by heat transfer, which is closely associated with the employed exploitation methods and well configurations. The main purpose of this study is to investigate the relationship between heat transfer and gas hydrate dissociation in a cuboid pressure vessel with different vertical well layouts (central well and side well) and production methods (pure depressurization (PD), depressurization combined with wellbore heating (DH), and huff and puff (HP)) through experimental and numerical simulations. The results show that the hydrate dissociation in the PD cases is promoted only by heat conduction from the surrounding environment. The heat transfer behaviors are basically the same when adopting depressurization with different wellbore locations. Addition of wellbore heating in the DH and HP cases will result in faster hydrate decomposition. However, heat conduction from the ambient will be impeded by wellbore heating. The cumulative heat transferred across the boundary will drop below 0 at a certain time, which would subsequently lead to a sharp rise of the heat loss. To reduce heat loss across the boundary, the heating section of the wellbore should be placed in the central area of the hydrate-bearing layer. In addition, it is found that intermittent heat injection with the HP method has the advantages of enhancing the heat convection effect and reducing the heat absorption of the hydrate deposit, which results in more favorable heat utilization efficiency and net energy gain.

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Dual inhibition effects of diamines on the formation of methane gas hydrate and their significance for natural gas production and transportation

Cited by 27 publications

References 46 publications

Nucleation and Growth of Gas Hydrates in Emulsions of Water in Asphaltene-Containing Oils

Nucleation and Growth of Gas Hydrates in Emulsions of Water in Asphaltene-Containing Oils

Ranking the Efficiency of Gas Hydrate Anti-agglomerants through Molecular Dynamic Simulations

Insights into the Control Mechanism of Heat Transfer on Methane Hydrate Dissociation via Depressurization and Wellbore Heating

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