Hydrate formation and deposition in a gas-dominant flowloop: Initial studies of the effect of velocity and subcooling

Aman, Zachary M.; Lorenzo, Mauricio Di; Kozielski, Karen; Koh, Carolyn A.; Warrier, Pramod; Johns, Michael L.; May, Eric F.

doi:10.1016/j.jngse.2016.05.015

Cited by 77 publications

(57 citation statements)

References 18 publications

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“…The model predictions were compared with results from previous experiments conducted in a one-pass, gas-dominant flowloop [17,18,23]. The pipeline fluids included natural gas, water and MEG.…”

Section: Model Validationmentioning

confidence: 99%

“…The values or functional dependences of the fluid and hydrate phase properties are summarized in were affected by sloughing. Further experimental details can be found in the original references [17,18,23].…”

Section: Model Validationmentioning

confidence: 99%

“…These included: hydrate formation at the wetted pipe perimeter, particle deposition from the gas stream and shear induced sloughing of the deposited film. The physical parameters used in this predictive model were tuned to match estimates of the hydrate formation and pressure drop previously measured using a single-pass, gas-dominated flowloop where the subcoolings, MEG dosage and gas velocity were varied [17,18,23]. The introduction of a preliminary mechanism for sloughing in the model enabled the first in-situ determinations of the effective shear strength of the hydrate deposit formed in these gas-dominant flowloop experiments.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Modelling hydrate deposition and sloughing in gas-dominant pipelines

Lorenzo

Aman

Kozielski

et al. 2018

The Journal of Chemical Thermodynamics

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Section: Model Validationmentioning

confidence: 99%

Section: Model Validationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Modelling hydrate deposition and sloughing in gas-dominant pipelines

Lorenzo

Aman

Kozielski

et al. 2018

The Journal of Chemical Thermodynamics

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“…Notably, the complicated wellbore temperature has a significant influence on the hydrate phase transition, resulting in new problems and challenges for the deep water well control in the drilling processes: (a) With variation in pressure and temperature, the decomposition of gas hydrates was also suggested to occur. Free gas will be formed in the wellbore annulus again, and it would bring hidden dangers for well control safety, even accidents of blowout happen; (b) hydrate blockages are the number one flow assurance and security problem. Hydrate blockages can form under various operation stages, such as circulation, shut‐in, and well killing .…”

Section: Introductionmentioning

confidence: 99%

“…FU et al decomposition of gas hydrates was also suggested to occur. Free gas will be formed in the wellbore annulus again, and it would bring hidden dangers for well control safety, even accidents of blowout happen [5][6][7][8][9] ; (b) hydrate blockages are the number one flow assurance and security problem. Hydrate blockages can form under various operation stages, such as circulation, shut-in, and well killing.…”

mentioning

confidence: 99%

Multiphase flow behavior in deep water drilling: The influence of gas hydrate

Jiang

et al. 2020

Energy Science & Engineering

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Hydrate phase transition may bring hidden dangers for well control safety, even accidents of blowout happen in deep water drilling. Accurate calculation of all the drilling parameters is of great importance for well control safety. In this study, the mathematic models of transient heat transfer and multiphase flow have been established with the consideration of hydrate phase transition. Furthermore, the position where hydrate formation is most likely to occur was predicted with the proposed models, and the factors affecting hydrate formation region were also analyzed. Finally, the analysis of the effect of gas hydrate phase transition on some important parameters in well control, such as the pit gain, gas void fraction, and bottom hole pressure, is presented. The results show that hydrates form near the mud line during the drilling and shut‐in stage, but the hydrate formation region will be narrowed as well killing start. Additionally, the hydrate formation region decreased with the increase of flow rate and increased with the increasing shut‐in time, hydrate inhibitors, and riser insulation are presented to prevent hydrate blockage. More importantly, the gas void fraction and pit gain decrease due to the formation of hydrates, leading to the gas kick early detection not timely and gas kick more “hidden.”

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Experimental study of hydrate formation in oil–water systems using a high‐pressure visual autoclave

Song

Wang

et al. 2019

AIChE Journal

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To investigate the characteristics of hydrate formation in oil–water systems, a high‐pressure visual autoclave equipped with visual windows was used where a series of hydrate formation experiments were performed from natural gas + diesel oil + water systems at different water cuts (30 and 70%), rotation rates (100, 200, 300 r/min) and thermodynamic conditions (temperature, pressure). According to the temperature and pressure profiles in test experiments, the processes of hydrate formation under two kinds of experimental procedures were analyzed first. Then, based on the experimental phenomenon observed through the visual windows, hydrate morphologies and hydrate morphological evolvements throughout the experiments were mainly investigated. In experiments, the growth and annealing of hydrate films on the wall, the agglomeration and deposition of hydrate coated water droplets, flocculent‐like hydrate deposition with water trapped in and the Pickering effect of hydrates were identified. Simultaneously, based on the experimental data of thermodynamic parameters, the kinetics of hydrate formation was studied by calculating the variations of hydrate film area and gas consumption in different experiments. In addition, the influences of temperature, pressure, and rotation rate on hydrate morphologies, hydrate morphological evolvements, and hydrate formation kinetics were also focused on.

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Hydrate formation and deposition in a gas-dominant flowloop: Initial studies of the effect of velocity and subcooling

Cited by 77 publications

References 18 publications

Modelling hydrate deposition and sloughing in gas-dominant pipelines

Modelling hydrate deposition and sloughing in gas-dominant pipelines

Multiphase flow behavior in deep water drilling: The influence of gas hydrate

Experimental study of hydrate formation in oil–water systems using a high‐pressure visual autoclave

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