New insights into the deposition of natural gas hydrate on pipeline surfaces: A molecular dynamics simulation study

Zhang, Jun; Fu, Hai-Qiang; Guo, Mu-Zhi; Wang, Zhao; Li, Li-Wen; Yin, Qi; Yan, You-Guo; Wei, Wei; Han, Wei-Feng; Zhong, Jie

doi:10.1016/j.petsci.2023.08.027

Cited by 2 publications

(2 citation statements)

References 62 publications

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“…14−16 Over the past several decades, the understanding of the mechanics underlying the hydrate plug formation has improved significantly. 17 In gas-dominated systems, hydrate plug production may mostly result from the growth or deposition of hydrate films from the flowing slurry. For systems that did not have a free water phase at first, Nicholas et al 18 and Rao et al 19 proposed a hydrate/ice deposition model according to the distinction between hydrate and wax deposition.…”

Section: Introductionmentioning

confidence: 99%

“…However, it might not be cost-effective to use a large number of thermodynamic inhibitors during transportation to prevent the emergency of hydrate and obstruction. Thus, in systems that are dominated by gas, oil, or water, hydrate can appear as a suspended and transportable slurry due to the development of hydrate management solutions. − Over the past several decades, the understanding of the mechanics underlying the hydrate plug formation has improved significantly …”

Section: Introductionmentioning

confidence: 99%

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Methane Hydrate Blockage in Gas–Water–Sand Systems: Insights from FBRM and PVM Analysis

Huang,

Zhu,

Zhang

et al. 2024

Energy Fuels

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Hydrate reservoirs are accompanied by a large amount of water migration during the extraction process, leading to severe sand outflow, making sand control and wellbore flow safety a huge challenge. The development and blocking of hydrates in gas−water−sand systems were investigated in terms of shear rates using a high-pressure stirred autoclave equipped with FBRM and PVM probes to estimate the average hydrate particle dimensions and amount of particles related to the hydration volume percent and flow resistance of hydrate slurry. An increment in the measured motor current was first observed when the hydrate volume fraction was around 18 ± 2 vol % with sand concentration varied from 0 to 1.5 wt % and clear changes of hydrate particle size and number were monitored. Initially, the hydrate particle surface area keeps increasing until it reaches a maximum between 2.1 and 13.7 vol % hydrate for shear rate 400−800 rpm, after which it quickly declines to a plateau at 12.1−19.1 vol % in a pure water system and 7.5−22 vol % in a sand-containing system. Aqueous phase hydrate bed development may have started when the value of the plateau is reached. The results may contribute to the development of predictive models for the start of hydrate blocking behavior in gas−water−sand systems.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Methane Hydrate Blockage in Gas–Water–Sand Systems: Insights from FBRM and PVM Analysis

Huang,

Zhu,

Zhang

et al. 2024

Energy Fuels

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Reparameterization of the mW model to accurately predict the experimental phase diagram of methane hydrate

Jin,

Zhong

2024

The Journal of Chemical Physics

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Due to their high computational efficiency, the coarse-grained water models are of particular importance for practical molecular simulations of gas hydrates. In these models, the mW model is successfully used to study many thermodynamics and dynamics of methane hydrate. Yet, despite several decades of intense research, the mW model is still found to overestimate the melting temperature of methane hydrate. We here employ the minimum mean squared error estimation to revisit the key parameter of the mW model, which determines the strength of the tetrahedral angle of the water system. Relying on the free energy calculations, we first estimate the chemical potentials of water in the liquid phase for temperatures at which methane hydrate forms. We then turn to the mean squared error to describe the chemical potential deviation between the mW model and the TIP4P/ice model (the latter could reproduce the experimental phase diagram of methane hydrate). By minimizing the mean squared error, we finally have an optimized parameter for the mW model. In this part, we also discuss the pressure effect on such reparameterization procedure. Moreover, relying on the direct coexistence method, the melting temperature determined using the reparameterized mW model is found to be consistent with the experimental data. This strategy provides a means to improve the coarse-grained model to match the experimental observations for temperatures in the range of interest.

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New insights into the deposition of natural gas hydrate on pipeline surfaces: A molecular dynamics simulation study

Cited by 2 publications

References 62 publications

Methane Hydrate Blockage in Gas–Water–Sand Systems: Insights from FBRM and PVM Analysis

Methane Hydrate Blockage in Gas–Water–Sand Systems: Insights from FBRM and PVM Analysis

Reparameterization of the mW model to accurately predict the experimental phase diagram of methane hydrate

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