Effect of Annular Gas-Liquid Two-Phase Flow on Dynamic Characteristics of Drill String

Natural gas hydrate (NGH) is a kind of new type green energy source with giant reserves which has been thought of highly by energy explorers in the world. However, NGH breaks down to produce some natural gas that enters the annulus and flows together with the drilling fluid. The gas-liquid two-phase...

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Autores principales:	Baojin Wang, Zhongyang Wang, Liuci Wang, Pengyu Sun
Formato:	article
Lenguaje:	EN
Publicado:	Hindawi Limited 2021
Materias:	Physics QC1-999
Acceso en línea:	https://doaj.org/article/14b4fa9e568149ae9914f59063100428
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id	oai:doaj.org-article:14b4fa9e568149ae9914f59063100428
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spelling	oai:doaj.org-article:14b4fa9e568149ae9914f590631004282021-11-22T01:10:26ZEffect of Annular Gas-Liquid Two-Phase Flow on Dynamic Characteristics of Drill String1875-920310.1155/2021/9976164https://doaj.org/article/14b4fa9e568149ae9914f590631004282021-01-01T00:00:00Zhttp://dx.doi.org/10.1155/2021/9976164https://doaj.org/toc/1875-9203Natural gas hydrate (NGH) is a kind of new type green energy source with giant reserves which has been thought of highly by energy explorers in the world. However, NGH breaks down to produce some natural gas that enters the annulus and flows together with the drilling fluid. The gas-liquid two-phase flow can have an impact on the work of the drill string. Therefore, it is important to study gas-liquid two-phase flow in the annulus on the dynamic characteristics of the drill string. In this article, taking a single drill string as the research object, a fluid-structure coupled finite element mathematical model of two-phase flow in the annulus and drill string is established based on computational fluid dynamics and computational structural dynamics theory. The finite element numerical simulation method is used to analyze the influence of drilling fluid and natural gas in the annulus on the dynamic characteristics of the drill string. The simulation analysis shows the following: (1) The motion of drilling fluid or natural gas in the annulus will reduce the natural frequency of the drill string, and the drilling fluid has a greater impact on the natural frequency of the drill string. (2) When single-phase drilling fluid flows in the annulus, the displacement peak in different directions, maximum equivalent stress, and strain of the drill string increase with the increase of the drilling fluid flow velocity or pressure, and the drilling fluid pressure has a more significant effect. (3) When the gas-liquid two-phase fluid flows in the annulus, the displacement peak, maximum equivalent stress, velocity amplitude, and acceleration amplitude of the drill string all increase with the natural gas flow velocity and natural gas content increase, and the natural gas flow velocity has a more significant effect.Baojin WangZhongyang WangLiuci WangPengyu SunHindawi LimitedarticlePhysicsQC1-999ENShock and Vibration, Vol 2021 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999
spellingShingle	Physics QC1-999 Baojin Wang Zhongyang Wang Liuci Wang Pengyu Sun Effect of Annular Gas-Liquid Two-Phase Flow on Dynamic Characteristics of Drill String
description	Natural gas hydrate (NGH) is a kind of new type green energy source with giant reserves which has been thought of highly by energy explorers in the world. However, NGH breaks down to produce some natural gas that enters the annulus and flows together with the drilling fluid. The gas-liquid two-phase flow can have an impact on the work of the drill string. Therefore, it is important to study gas-liquid two-phase flow in the annulus on the dynamic characteristics of the drill string. In this article, taking a single drill string as the research object, a fluid-structure coupled finite element mathematical model of two-phase flow in the annulus and drill string is established based on computational fluid dynamics and computational structural dynamics theory. The finite element numerical simulation method is used to analyze the influence of drilling fluid and natural gas in the annulus on the dynamic characteristics of the drill string. The simulation analysis shows the following: (1) The motion of drilling fluid or natural gas in the annulus will reduce the natural frequency of the drill string, and the drilling fluid has a greater impact on the natural frequency of the drill string. (2) When single-phase drilling fluid flows in the annulus, the displacement peak in different directions, maximum equivalent stress, and strain of the drill string increase with the increase of the drilling fluid flow velocity or pressure, and the drilling fluid pressure has a more significant effect. (3) When the gas-liquid two-phase fluid flows in the annulus, the displacement peak, maximum equivalent stress, velocity amplitude, and acceleration amplitude of the drill string all increase with the natural gas flow velocity and natural gas content increase, and the natural gas flow velocity has a more significant effect.
format	article
author	Baojin Wang Zhongyang Wang Liuci Wang Pengyu Sun
author_facet	Baojin Wang Zhongyang Wang Liuci Wang Pengyu Sun
author_sort	Baojin Wang
title	Effect of Annular Gas-Liquid Two-Phase Flow on Dynamic Characteristics of Drill String
title_short	Effect of Annular Gas-Liquid Two-Phase Flow on Dynamic Characteristics of Drill String
title_full	Effect of Annular Gas-Liquid Two-Phase Flow on Dynamic Characteristics of Drill String
title_fullStr	Effect of Annular Gas-Liquid Two-Phase Flow on Dynamic Characteristics of Drill String
title_full_unstemmed	Effect of Annular Gas-Liquid Two-Phase Flow on Dynamic Characteristics of Drill String
title_sort	effect of annular gas-liquid two-phase flow on dynamic characteristics of drill string
publisher	Hindawi Limited
publishDate	2021
url	https://doaj.org/article/14b4fa9e568149ae9914f59063100428
work_keys_str_mv	AT baojinwang effectofannulargasliquidtwophaseflowondynamiccharacteristicsofdrillstring AT zhongyangwang effectofannulargasliquidtwophaseflowondynamiccharacteristicsofdrillstring AT liuciwang effectofannulargasliquidtwophaseflowondynamiccharacteristicsofdrillstring AT pengyusun effectofannulargasliquidtwophaseflowondynamiccharacteristicsofdrillstring
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Effect of Annular Gas-Liquid Two-Phase Flow on Dynamic Characteristics of Drill String

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