Study on Dynamic Characteristics of Drill String Considering Rock-Breaking Process

Using various tools to obtain downhole data to reach a precise pore pressure model is an important means to predict overpressure. Most downhole tools are connected to the lower end of drill string and move with it. It is necessary to understand the motion state and dynamic characteristics of drill s...

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Autores principales:	Deyang Liang, Zhichuan Guan, Yuqiang Xu, Yongwang Liu
Formato:	article
Lenguaje:	EN
Publicado:	Frontiers Media S.A. 2021
Materias:	pore pressure vertical well drill string vibration finite element method rock-breaking process Science Q
Acceso en línea:	https://doaj.org/article/307a9e92974741508556661fb28f2886
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spelling	oai:doaj.org-article:307a9e92974741508556661fb28f28862021-12-01T13:55:10ZStudy on Dynamic Characteristics of Drill String Considering Rock-Breaking Process2296-646310.3389/feart.2021.799061https://doaj.org/article/307a9e92974741508556661fb28f28862021-11-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/feart.2021.799061/fullhttps://doaj.org/toc/2296-6463Using various tools to obtain downhole data to reach a precise pore pressure model is an important means to predict overpressure. Most downhole tools are connected to the lower end of drill string and move with it. It is necessary to understand the motion state and dynamic characteristics of drill string, which will affect the use of downhole tools. In this paper, a drilling process considering rock-breaking process in vertical wells is simulated using finite element method. In the simulation, gravity is applied to the whole drill string. The contact force between PDC bit and formation is the weight on bit (WOB). And a rotation speed is applied to the upper end of drill string. Analysis of the results shows that the vibration amplitude of bottom hole WOB (contact force between PDC bit and formation, which is the real WOB in drilling process) is bigger than the amplitude of wellhead WOB (acquired through conversion using Hook load, which is on behalf of the WOB obtained on drilling site). Both wellhead WOB and bottom hole WOB decline with a fluctuation in drilling process. In small initial WOB and low rotation speed conditions, the fluctuation of wellhead WOB focuses on low frequency, the fluctuation of bottom hole WOB focus on high frequency, and the phase of them are not identical. In large initial WOB and high rotation speed conditions, the fluctuation of wellhead WOB and bottom hole WOB both become more irregular. As for wellhead torque and bottom hole torque, the fluctuation of them mainly focuses on low frequency. And in high rotation speed conditions, wellhead torque may become negative. The research results are beneficial to the usage of downhole tools.Deyang LiangDeyang LiangDeyang LiangZhichuan GuanZhichuan GuanZhichuan GuanYuqiang XuYuqiang XuYuqiang XuYongwang LiuYongwang LiuYongwang LiuFrontiers Media S.A.articlepore pressurevertical welldrill string vibrationfinite element methodrock-breaking processScienceQENFrontiers in Earth Science, Vol 9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	pore pressure vertical well drill string vibration finite element method rock-breaking process Science Q
spellingShingle	pore pressure vertical well drill string vibration finite element method rock-breaking process Science Q Deyang Liang Deyang Liang Deyang Liang Zhichuan Guan Zhichuan Guan Zhichuan Guan Yuqiang Xu Yuqiang Xu Yuqiang Xu Yongwang Liu Yongwang Liu Yongwang Liu Study on Dynamic Characteristics of Drill String Considering Rock-Breaking Process
description	Using various tools to obtain downhole data to reach a precise pore pressure model is an important means to predict overpressure. Most downhole tools are connected to the lower end of drill string and move with it. It is necessary to understand the motion state and dynamic characteristics of drill string, which will affect the use of downhole tools. In this paper, a drilling process considering rock-breaking process in vertical wells is simulated using finite element method. In the simulation, gravity is applied to the whole drill string. The contact force between PDC bit and formation is the weight on bit (WOB). And a rotation speed is applied to the upper end of drill string. Analysis of the results shows that the vibration amplitude of bottom hole WOB (contact force between PDC bit and formation, which is the real WOB in drilling process) is bigger than the amplitude of wellhead WOB (acquired through conversion using Hook load, which is on behalf of the WOB obtained on drilling site). Both wellhead WOB and bottom hole WOB decline with a fluctuation in drilling process. In small initial WOB and low rotation speed conditions, the fluctuation of wellhead WOB focuses on low frequency, the fluctuation of bottom hole WOB focus on high frequency, and the phase of them are not identical. In large initial WOB and high rotation speed conditions, the fluctuation of wellhead WOB and bottom hole WOB both become more irregular. As for wellhead torque and bottom hole torque, the fluctuation of them mainly focuses on low frequency. And in high rotation speed conditions, wellhead torque may become negative. The research results are beneficial to the usage of downhole tools.
format	article
author	Deyang Liang Deyang Liang Deyang Liang Zhichuan Guan Zhichuan Guan Zhichuan Guan Yuqiang Xu Yuqiang Xu Yuqiang Xu Yongwang Liu Yongwang Liu Yongwang Liu
author_facet	Deyang Liang Deyang Liang Deyang Liang Zhichuan Guan Zhichuan Guan Zhichuan Guan Yuqiang Xu Yuqiang Xu Yuqiang Xu Yongwang Liu Yongwang Liu Yongwang Liu
author_sort	Deyang Liang
title	Study on Dynamic Characteristics of Drill String Considering Rock-Breaking Process
title_short	Study on Dynamic Characteristics of Drill String Considering Rock-Breaking Process
title_full	Study on Dynamic Characteristics of Drill String Considering Rock-Breaking Process
title_fullStr	Study on Dynamic Characteristics of Drill String Considering Rock-Breaking Process
title_full_unstemmed	Study on Dynamic Characteristics of Drill String Considering Rock-Breaking Process
title_sort	study on dynamic characteristics of drill string considering rock-breaking process
publisher	Frontiers Media S.A.
publishDate	2021
url	https://doaj.org/article/307a9e92974741508556661fb28f2886
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Study on Dynamic Characteristics of Drill String Considering Rock-Breaking Process

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