Numerical flow analysis of hydrate formation in offshore pipelines using computational fluid dynamics (CFD)

Eugenio Turco Neto, Azizur Rahaman, Syed Imtiaz, Salim Ahmed

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Hydrate formation is one of the major challenges faced by the Oil and Gas industry in offshore facilities due to its potential to plug wells and reduce production. Several experimental studies have been published so far in order to understand the mechanisms that govern the hydrate formation process under its thermodynamic favorable conditions; however, the results are not very accurate due to the uncertainties related to measurements and metastable behavior observed in some cases involving hydrate formation. Moreover, thermodynamic models have been proposed to overcome the latter constraints but they are formulated assuming thermodynamic equilibrium, which such condition is difficult to be achieved in flow systems due to the turbulence effects. Due to the low solubility of methane in water, the mass transfer effects can possibly control several mechanisms that are still unknown about the hydrate formation process. Also, the reaction kinetics plays a major rule in minimizing hydrate formation rate. The objective of this work is to develop a mechanistic Computational Fluid Dynamics (CFD) model in order to predict the formation of hydrate particles along the pipeline from a hydrate-free gas dominated stream constituted by methane and water only. The transient simulations were performed using a commercial CFD software package considering the multiphase hydrate chemical reaction and mass transfer resistances. The geometry used was a straight pipe with 5 m length and 0.0254 m diameter. The results have shown the appearance of regions in the pipeline at which hydrate formation is controlled either by the mass transfer or reaction kinetics. The rate of hydrate formation profile has shown to be high at the inlet even though the temperature at that regions was high, which can be a possible explanation for metastable region encountered in most of recent phase diagrams.

Original languageEnglish
Title of host publicationPolar and Arctic Sciences and Technology; Petroleum Technology
PublisherAmerican Society of Mechanical Engineers (ASME)
Volume8
ISBN (Electronic)9780791849996
DOIs
Publication statusPublished - 2016
Externally publishedYes
EventASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2016 - Busan, Korea, Republic of
Duration: 19 Jun 201624 Jun 2016

Other

OtherASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2016
CountryKorea, Republic of
CityBusan
Period19/6/1624/6/16

Fingerprint

Offshore pipelines
Hydrates
Computational fluid dynamics
Mass transfer
Thermodynamics
Reaction kinetics
Methane
Pipelines
Gas industry
Software packages
Phase diagrams
Water
Chemical reactions
Dynamic models
Turbulence
Solubility
Pipe

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Ocean Engineering
  • Mechanical Engineering

Cite this

Neto, E. T., Rahaman, A., Imtiaz, S., & Ahmed, S. (2016). Numerical flow analysis of hydrate formation in offshore pipelines using computational fluid dynamics (CFD). In Polar and Arctic Sciences and Technology; Petroleum Technology (Vol. 8). [V008T11A007] American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/OMAE2016-54534

Numerical flow analysis of hydrate formation in offshore pipelines using computational fluid dynamics (CFD). / Neto, Eugenio Turco; Rahaman, Azizur; Imtiaz, Syed; Ahmed, Salim.

Polar and Arctic Sciences and Technology; Petroleum Technology. Vol. 8 American Society of Mechanical Engineers (ASME), 2016. V008T11A007.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Neto, ET, Rahaman, A, Imtiaz, S & Ahmed, S 2016, Numerical flow analysis of hydrate formation in offshore pipelines using computational fluid dynamics (CFD). in Polar and Arctic Sciences and Technology; Petroleum Technology. vol. 8, V008T11A007, American Society of Mechanical Engineers (ASME), ASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2016, Busan, Korea, Republic of, 19/6/16. https://doi.org/10.1115/OMAE2016-54534
Neto ET, Rahaman A, Imtiaz S, Ahmed S. Numerical flow analysis of hydrate formation in offshore pipelines using computational fluid dynamics (CFD). In Polar and Arctic Sciences and Technology; Petroleum Technology. Vol. 8. American Society of Mechanical Engineers (ASME). 2016. V008T11A007 https://doi.org/10.1115/OMAE2016-54534
Neto, Eugenio Turco ; Rahaman, Azizur ; Imtiaz, Syed ; Ahmed, Salim. / Numerical flow analysis of hydrate formation in offshore pipelines using computational fluid dynamics (CFD). Polar and Arctic Sciences and Technology; Petroleum Technology. Vol. 8 American Society of Mechanical Engineers (ASME), 2016.
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