An interfacial gas-enrichment strategy for mitigating hydrate adhesion and blockage

Ma, Rui; Xiao, Senbo; Chang, Yuanhao; Fu, Yuequn; He, Jianying; Zhang, Zhiliang

doi:10.1016/j.cej.2022.139918

Cited by 11 publications

(3 citation statements)

References 74 publications

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“…Low-temperature and high-pressure environments, in the presence of natural gas and water, create a predisposition for the formation of hydrate agglomerates and deposits, which impairs production and causes substantial economic loss. To tackle the problem of hydrate formation, two main approaches are employed in the industry: avoidanceby using inhibitors, , depressurization, thermal insulation and heating, and decompositionand managementthrough monitoring hydrate formation to ensure that production is maintained. , …”

Section: Introductionmentioning

confidence: 99%

Numerical Solver for Hydrate Plug Removal through One-Sided Depressurization Operations in Gas-Condensate Pipelines

Castello Branco,

Ristow Branco,

Barreto

et al. 2024

Energy Fuels

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One-sided depressurization is often employed in hydrate plug removal processes and has inherent risks associated with the high velocities that the plug achieves due to the pressure differential. In critical conditions, events such as pipeline ruptures may occur. Therefore, the need for detailed numerical studies to help reduce the risk of such operations is paramount. The present work devises a numerical methodology to predict the dynamics of plugs in transient two-phase flow conditions, coupled with a compositional model to determine the formation of the gas condensate. Different scenarios were examined to evaluate the impact on the plug displacement and flow variables due to the accumulation of a liquid slug at the plug head, as well as several operational conditions with different plug sizes, initial plug positions, and pressure differences. The effect of including an energy storage model in the insulating layers is also discussed. Results showed a negligible impact of the liquid formed at the plug's head. However, a significant impact on the temperature distribution due to the energy stored at the insulating layers was observed without affecting the pressure and plug variables. It was also shown that for all cases a fast transient occurs at the beginning of the plug displacement when it reaches very high velocities, followed by a slower transient. Depending on the operational scenario, the plug stops before reaching the pipeline exit or can reach the exit with high velocity, indicating the need to explore different scenarios to design this type of operation.

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Section: Introductionmentioning

confidence: 99%

Numerical Solver for Hydrate Plug Removal through One-Sided Depressurization Operations in Gas-Condensate Pipelines

Castello Branco,

Ristow Branco,

Barreto

et al. 2024

Energy Fuels

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“…), lattice structures (such as type I, type II, type H, etc. ), and macro-occurrence forms (including dispersed, massive, vein, etc.) .…”

Section: Introductionmentioning

confidence: 99%

“…), 11 lattice structures (such as type I, type II, type H, etc. ), 12 and macro-occurrence forms (including dispersed, massive, vein, etc.). 13 But there is no consensus on the micro-occurrence type of hydrate.…”

Section: ■ Introductionmentioning

confidence: 99%

Investigation of Natural Gas Hydrate Microscopic Occurrence Types and Pore-Scale Flow Simulation Based on Digital Cores

Yin,

Sun,

Song

et al. 2023

Energy Fuels

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Hydrates in porous media are in a variety of microoccurrence types, which affect the flow of fluid. In this study, multiphase digital cores containing particles, pores, and hydrates were reconstructed based on CT scan data of hydrate-containing cores. The hydrate network was extracted by the watershed method and the maximum ball method. Then, a parameter set was established to characterize the topological characteristics of hydrates. The self-organizing mapping (SOM) neural network was used to classify the hydrate types in the cores: the pore-floating hydrate accounted for 22.8%, the bridging hydrate accounted for 49.8%, and the cementing hydrate accounted for 27.4%. Furthermore, the influence of different hydrate micro-occurrence types on porosity, flow rate, and permeability was studied by flow simulation. It revealed the fluid flow characteristics in hydrate-containing cores: the existence of hydrates caused the large pores to be divided into small pores or blocked, which resulted in the reduction of the porosity, flow volume, and permeability. Bridging hydrates have the most obvious effect on reducing porosity and permeability, followed by pore-floating and cementing hydrates.

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Hydrate blockage in subsea oil/gas flowlines: Prediction, prevention, and remediation

Wang

Meng

Han

et al. 2023

Chemical Engineering Journal

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An interfacial gas-enrichment strategy for mitigating hydrate adhesion and blockage

Cited by 11 publications

References 74 publications

Numerical Solver for Hydrate Plug Removal through One-Sided Depressurization Operations in Gas-Condensate Pipelines

Numerical Solver for Hydrate Plug Removal through One-Sided Depressurization Operations in Gas-Condensate Pipelines

Investigation of Natural Gas Hydrate Microscopic Occurrence Types and Pore-Scale Flow Simulation Based on Digital Cores

Hydrate blockage in subsea oil/gas flowlines: Prediction, prevention, and remediation

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