Methane hydrate thermodynamic phase stability predictions in the presence of salt inhibitors and their mixture for offshore operations

A thermodynamic model is developed and used in this study to predict the phase equilibrium conditions of a methane -aqueous salt inhibitor -water hydrate system. The modified van der Waals-Platteeuw (vdWP) model is used to calculate the equilibrium condition of the hydrate phase. To compute the fuga...

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Autores principales:	Venkata Ramana Avula, Venkata Swamy Nalajala, Golamari Siva Reddy, M.J.A. Prince
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Gas hydrate Inhibitors Methane Phase equilibrium Aqueous salt inhibitors Thermodynamics QC310.15-319
Acceso en línea:	https://doaj.org/article/ddf46612924e489689be658de53add78
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spelling	oai:doaj.org-article:ddf46612924e489689be658de53add782021-11-20T05:16:16ZMethane hydrate thermodynamic phase stability predictions in the presence of salt inhibitors and their mixture for offshore operations2667-312610.1016/j.ctta.2021.100022https://doaj.org/article/ddf46612924e489689be658de53add782021-09-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2667312621000195https://doaj.org/toc/2667-3126A thermodynamic model is developed and used in this study to predict the phase equilibrium conditions of a methane -aqueous salt inhibitor -water hydrate system. The modified van der Waals-Platteeuw (vdWP) model is used to calculate the equilibrium condition of the hydrate phase. To compute the fugacities of gas and liquid phases, the Peng-Robinson equation of state (PR-EoS) and a previously developed Pitzer-Mayorga-Zavitsas-hydration model are used. The model predictions are compared to experimental results on methane hydrate phase equilibrium in the presence of an aqueous salt inhibitor. The absolute average relative deviation in predicted methane -aqueous salt inhibitor -water hydrate equilibrium pressure (AARD-P%) with the developed Pitzer-Mayorga-Zavitsas-Hydration model is 3.59% for CH4+NaCl, 1.52% for CH4+KCl, and 2.70% for CH4+ CaCl2. Finally, the hydrate suppression temperature caused by aqueous salt inhibitors and their mixtures on methane hydrate phase stability is calculated, and it is CaCl2>KCl>NaCl in that order. This work's phase equilibrium model demonstrates the potential application of determining methane hydrate equilibrium conditions in the presence of aqueous salt inhibitors and their mixtures used in offshore oil field applications.Venkata Ramana AvulaVenkata Swamy NalajalaGolamari Siva ReddyM.J.A. PrinceElsevierarticleGas hydrateInhibitorsMethanePhase equilibriumAqueous salt inhibitorsThermodynamicsQC310.15-319ENChemical Thermodynamics and Thermal Analysis, Vol 3, Iss , Pp 100022- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Gas hydrate Inhibitors Methane Phase equilibrium Aqueous salt inhibitors Thermodynamics QC310.15-319
spellingShingle	Gas hydrate Inhibitors Methane Phase equilibrium Aqueous salt inhibitors Thermodynamics QC310.15-319 Venkata Ramana Avula Venkata Swamy Nalajala Golamari Siva Reddy M.J.A. Prince Methane hydrate thermodynamic phase stability predictions in the presence of salt inhibitors and their mixture for offshore operations
description	A thermodynamic model is developed and used in this study to predict the phase equilibrium conditions of a methane -aqueous salt inhibitor -water hydrate system. The modified van der Waals-Platteeuw (vdWP) model is used to calculate the equilibrium condition of the hydrate phase. To compute the fugacities of gas and liquid phases, the Peng-Robinson equation of state (PR-EoS) and a previously developed Pitzer-Mayorga-Zavitsas-hydration model are used. The model predictions are compared to experimental results on methane hydrate phase equilibrium in the presence of an aqueous salt inhibitor. The absolute average relative deviation in predicted methane -aqueous salt inhibitor -water hydrate equilibrium pressure (AARD-P%) with the developed Pitzer-Mayorga-Zavitsas-Hydration model is 3.59% for CH4+NaCl, 1.52% for CH4+KCl, and 2.70% for CH4+ CaCl2. Finally, the hydrate suppression temperature caused by aqueous salt inhibitors and their mixtures on methane hydrate phase stability is calculated, and it is CaCl2>KCl>NaCl in that order. This work's phase equilibrium model demonstrates the potential application of determining methane hydrate equilibrium conditions in the presence of aqueous salt inhibitors and their mixtures used in offshore oil field applications.
format	article
author	Venkata Ramana Avula Venkata Swamy Nalajala Golamari Siva Reddy M.J.A. Prince
author_facet	Venkata Ramana Avula Venkata Swamy Nalajala Golamari Siva Reddy M.J.A. Prince
author_sort	Venkata Ramana Avula
title	Methane hydrate thermodynamic phase stability predictions in the presence of salt inhibitors and their mixture for offshore operations
title_short	Methane hydrate thermodynamic phase stability predictions in the presence of salt inhibitors and their mixture for offshore operations
title_full	Methane hydrate thermodynamic phase stability predictions in the presence of salt inhibitors and their mixture for offshore operations
title_fullStr	Methane hydrate thermodynamic phase stability predictions in the presence of salt inhibitors and their mixture for offshore operations
title_full_unstemmed	Methane hydrate thermodynamic phase stability predictions in the presence of salt inhibitors and their mixture for offshore operations
title_sort	methane hydrate thermodynamic phase stability predictions in the presence of salt inhibitors and their mixture for offshore operations
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/ddf46612924e489689be658de53add78
work_keys_str_mv	AT venkataramanaavula methanehydratethermodynamicphasestabilitypredictionsinthepresenceofsaltinhibitorsandtheirmixtureforoffshoreoperations AT venkataswamynalajala methanehydratethermodynamicphasestabilitypredictionsinthepresenceofsaltinhibitorsandtheirmixtureforoffshoreoperations AT golamarisivareddy methanehydratethermodynamicphasestabilitypredictionsinthepresenceofsaltinhibitorsandtheirmixtureforoffshoreoperations AT mjaprince methanehydratethermodynamicphasestabilitypredictionsinthepresenceofsaltinhibitorsandtheirmixtureforoffshoreoperations
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Methane hydrate thermodynamic phase stability predictions in the presence of salt inhibitors and their mixture for offshore operations

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