Fundamental Evaluation of Sealability of Greased Metal-to-Metal Seal on Premium Threaded Joints at High Pressure and High Temperature

Metal-to-metal seals in premium threaded joints (PJs) for Oil Country Tubular Goods are used in severe environments such as high pressure and high temperature. Under the extreme conditions, the thermal degradation of applied grease on the seal surfaces can affect the sealability of metal-to-metal se...

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Autores principales:	Keita Inose, Masaaki Sugino, Joichi Sugimura
Formato:	article
Lenguaje:	EN
Publicado:	Japanese Society of Tribologists 2021
Materias:	premium threaded joint metal-to-metal seal grease high pressure high temperature gas tightness Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/3d9e89facaa44e188553c3299a7d17fb
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spelling	oai:doaj.org-article:3d9e89facaa44e188553c3299a7d17fb2021-11-05T09:31:11ZFundamental Evaluation of Sealability of Greased Metal-to-Metal Seal on Premium Threaded Joints at High Pressure and High Temperature1881-219810.2474/trol.16.192https://doaj.org/article/3d9e89facaa44e188553c3299a7d17fb2021-09-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/trol/16/3/16_192/_pdf/-char/enhttps://doaj.org/toc/1881-2198Metal-to-metal seals in premium threaded joints (PJs) for Oil Country Tubular Goods are used in severe environments such as high pressure and high temperature. Under the extreme conditions, the thermal degradation of applied grease on the seal surfaces can affect the sealability of metal-to-metal seal. In this study, changes in the sealability of greased metal-to-metal seal due to elevated temperature were investigated by fundamental gas tightness tests. In addition, changes in grease property at high temperature were also investigated. It was found that one of the causes of the loss of the sealability of metal-to-metal seal at high temperature was the decrease in grease viscous resistance against high pressure due to thermal degradation of grease. The decrease in grease viscous resistance was caused by the decrease in the kinematic viscosity of the base oil under 125°C at which the network structure of the thickener was almost maintained. Beyond 150°C, the decrease of complex viscosity of the grease due to the collapse of the network structure of the thickener decreased the grease viscous resistance. The latter significantly affected the loss of sealability of the metal-to-metal seal.Keita InoseMasaaki SuginoJoichi SugimuraJapanese Society of Tribologistsarticlepremium threaded jointmetal-to-metal sealgreasehigh pressurehigh temperaturegas tightnessPhysicsQC1-999Engineering (General). Civil engineering (General)TA1-2040Mechanical engineering and machineryTJ1-1570ChemistryQD1-999ENTribology Online, Vol 16, Iss 3, Pp 192-198 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	premium threaded joint metal-to-metal seal grease high pressure high temperature gas tightness Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
spellingShingle	premium threaded joint metal-to-metal seal grease high pressure high temperature gas tightness Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999 Keita Inose Masaaki Sugino Joichi Sugimura Fundamental Evaluation of Sealability of Greased Metal-to-Metal Seal on Premium Threaded Joints at High Pressure and High Temperature
description	Metal-to-metal seals in premium threaded joints (PJs) for Oil Country Tubular Goods are used in severe environments such as high pressure and high temperature. Under the extreme conditions, the thermal degradation of applied grease on the seal surfaces can affect the sealability of metal-to-metal seal. In this study, changes in the sealability of greased metal-to-metal seal due to elevated temperature were investigated by fundamental gas tightness tests. In addition, changes in grease property at high temperature were also investigated. It was found that one of the causes of the loss of the sealability of metal-to-metal seal at high temperature was the decrease in grease viscous resistance against high pressure due to thermal degradation of grease. The decrease in grease viscous resistance was caused by the decrease in the kinematic viscosity of the base oil under 125°C at which the network structure of the thickener was almost maintained. Beyond 150°C, the decrease of complex viscosity of the grease due to the collapse of the network structure of the thickener decreased the grease viscous resistance. The latter significantly affected the loss of sealability of the metal-to-metal seal.
format	article
author	Keita Inose Masaaki Sugino Joichi Sugimura
author_facet	Keita Inose Masaaki Sugino Joichi Sugimura
author_sort	Keita Inose
title	Fundamental Evaluation of Sealability of Greased Metal-to-Metal Seal on Premium Threaded Joints at High Pressure and High Temperature
title_short	Fundamental Evaluation of Sealability of Greased Metal-to-Metal Seal on Premium Threaded Joints at High Pressure and High Temperature
title_full	Fundamental Evaluation of Sealability of Greased Metal-to-Metal Seal on Premium Threaded Joints at High Pressure and High Temperature
title_fullStr	Fundamental Evaluation of Sealability of Greased Metal-to-Metal Seal on Premium Threaded Joints at High Pressure and High Temperature
title_full_unstemmed	Fundamental Evaluation of Sealability of Greased Metal-to-Metal Seal on Premium Threaded Joints at High Pressure and High Temperature
title_sort	fundamental evaluation of sealability of greased metal-to-metal seal on premium threaded joints at high pressure and high temperature
publisher	Japanese Society of Tribologists
publishDate	2021
url	https://doaj.org/article/3d9e89facaa44e188553c3299a7d17fb
work_keys_str_mv	AT keitainose fundamentalevaluationofsealabilityofgreasedmetaltometalsealonpremiumthreadedjointsathighpressureandhightemperature AT masaakisugino fundamentalevaluationofsealabilityofgreasedmetaltometalsealonpremiumthreadedjointsathighpressureandhightemperature AT joichisugimura fundamentalevaluationofsealabilityofgreasedmetaltometalsealonpremiumthreadedjointsathighpressureandhightemperature
_version_	1718444282191282176

Fundamental Evaluation of Sealability of Greased Metal-to-Metal Seal on Premium Threaded Joints at High Pressure and High Temperature

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