An inward and outward natural gas hydrates growth shell model considering intrinsic kinetics, mass and heat transfer

Shi, Bohui; Gong, Jing; Sun, Chang‐Yu; Zhao, Junfang; Ding, Yao; Chen, Guangjin

doi:10.1016/j.cej.2011.05.029

Cited by 131 publications

(142 citation statements)

References 27 publications

(48 reference statements)

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“…With morphological observations of hydrate shell growth on the surface of water droplets exposed to hydrate-forming gas, Lee et al (2005) deduced that water transferring through the pores of the hydrate film and gas diffusing through the hydrate are both responsible for the growth in thickness of the hydrate shells. With this deduction, Shi et al (2011) proposed an inward-outward double growth model. Considering these arguments, the growth in thickness of the hydrate shell is studied by observing its morphological change in this work.…”

Section: Outward Growth In the Thickness Of The Hydrate Shellmentioning

confidence: 98%

Factors controlling hydrate film growth at water/oil interfaces

Wang

Sun

et al. 2015

Chemical Engineering Science

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Section: Outward Growth In the Thickness Of The Hydrate Shellmentioning

confidence: 98%

Factors controlling hydrate film growth at water/oil interfaces

Wang

Sun

et al. 2015

Chemical Engineering Science

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“…When it comes to gas-oil-water systems, the phenomena are more complex. Literature converges to the use of the shell approach 11, 15,16,22,23 , where hydrates are considered to form encompassing the droplets, forming a hydrate shell with an inner liquid core (often applied to water-in-oil dispersion flow).…”

Section: Introductionmentioning

confidence: 99%

“…Mathematical description has been formulated in the literature on the core shrinkage due to gas diffusion through the solid shell 15 , outer growth due to water permeation 16 and gas consumption due to crystallization in the water trapped inside the porous structure 24 .…”

Section: Introductionmentioning

confidence: 99%

A Multiscale Approach for Gas Hydrates Considering Structure, Agglomeration, and Transportability under Multiphase Flow Conditions: I. Phenomenological Model

Bassani

Melchuna

Cameirão

et al. 2019

Ind. Eng. Chem. Res.

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A new topological model on how gas hydrates form, grow, and agglomerate for oil and water continuous flow, with and without surfactant additives, is presented. A multiscale approach is used to explain how the porous structure of gas hydrates and the affinity between the phases affect the particle morphology and their agglomeration. We propose that gas consumption due to hydrate growth happens mostly in the water trapped inside the capillaries of the hydrate structure near the outer surface of the particles. This approach is herein referred to as the “sponge approach” and is treated as a surface problem, instead of the volume problem often treated in literature (the “shell approach”). Affinity between phases (which in a macro point of view is interpreted as a wetted angle that gives rise to capillarity forces and that can be changed by the use of surfactant additives) describes the preferential entrapment of oil or water inside the hydrate sponge structure. Yet by splitting agglomeration into smaller processes and depending on the morphology of the particles and on the evolution of the porous structure of the hydrates, (i) capillarity bridges may form, causing particles to be sticky, and (ii) water may be available at the outer surface of the particles and may promote consolidation of particle–particle (agglomeration) or particle-wall (deposition). The settling of slurries is treated as a separated solid–liquid flow instability problem once mixture deceleration (due to phase consumption during crystallization) and particle size (due to growth and agglomeration) are known. We also propose a new explanation on how surfactants act as anti-agglomerants in oil continuous flow, differently from the common DLVO theory used in literature, which can only explain anti-agglomeration of particles much smaller than the ones formed over droplets of a very fine dispersion flow.

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“…However, due to the limitations of the intrinsic kinetics, mass transfer, and heat transfer, porous hydrate particles with absorbed water are formed rather than solid hydrate particles. [40][41][42] Once the hydrate particles are formed, the strong interaction between the hydrate particles cause them to form fractal-like hydrate aggregates. [43][44][45] When larger hydrate chunks are formed, water is absorbed and trapped in the hydrate mass.…”

Section: Hydrate Deposition Characteristicsmentioning

confidence: 99%

Dynamics of hydrate formation and deposition under pseudo multiphase flow

2017

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Gas hydrate formation is considered one of the major challenges in the flow assurance of deepwater oil and gas pipelines, as their blockage by hydrate can lead to significant production/economic loss and safety risk. Understanding the hydrate formation and deposition processes can improve the management methods in field development and production. This study used a high‐pressure rocking cell to simulate multiphase flow conditions to visually investigate the hydrate formation and deposition from an oil‐gas‐water system. The changing hydrate morphologies, flow pattern and particle distribution during hydrate formation were studied and a conceptual model was proposed. The relative motion of hydrates to the cell wall and the final morphology of the hydrate chunks are found to be two critical parameters for evaluating hydrate deposition characteristics in the flow system. Five types of hydrate deposition morphologies are observed and these are correlated to the hydrate porosity. © 2017 American Institute of Chemical Engineers AIChE J, 63: 4136–4146, 2017

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An inward and outward natural gas hydrates growth shell model considering intrinsic kinetics, mass and heat transfer

Cited by 131 publications

References 27 publications

Factors controlling hydrate film growth at water/oil interfaces

Factors controlling hydrate film growth at water/oil interfaces

A Multiscale Approach for Gas Hydrates Considering Structure, Agglomeration, and Transportability under Multiphase Flow Conditions: I. Phenomenological Model

Dynamics of hydrate formation and deposition under pseudo multiphase flow

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