Analysis of borehole stability in gas drilling using a thermal elastoplastic coupling model

Abstract Gas drilling causes lower pressure in the borehole and the Joule‐Thomson effect to occur at the bit nozzle, resulting in a temperature distribution in the borehole different from that in the original formation. The borehole temperature is far lower than the original formation temperature ne...

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Autores principales:	Zhongxi Zhu, Chaofei Wang, Yuchen Ye, Wanneng Lei
Formato:	article
Lenguaje:	EN
Publicado:	Wiley 2021
Materias:	complete stress‐strain elastoplastic coupling gas drilling plastic softening strength thermal stress Technology T Science Q
Acceso en línea:	https://doaj.org/article/425748b925b8406899d045732bf5d732
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spelling	oai:doaj.org-article:425748b925b8406899d045732bf5d7322021-12-02T05:24:30ZAnalysis of borehole stability in gas drilling using a thermal elastoplastic coupling model2050-050510.1002/ese3.992https://doaj.org/article/425748b925b8406899d045732bf5d7322021-12-01T00:00:00Zhttps://doi.org/10.1002/ese3.992https://doaj.org/toc/2050-0505Abstract Gas drilling causes lower pressure in the borehole and the Joule‐Thomson effect to occur at the bit nozzle, resulting in a temperature distribution in the borehole different from that in the original formation. The borehole temperature is far lower than the original formation temperature near the bottom of the borehole. This temperature difference leads to thermal stress on the borehole. The borehole temperature is higher than the formation temperature in the upper part of the borehole, causing the surrounding rock to expand because of the resulting thermal stress, which enhances the expansion of the surrounding rock into the borehole. The force supporting the borehole wall is thus weaker, and the borehole inevitably deforms under the original in situ stress. Meanwhile, the complete stress‐strain process of rock can be simplified into three linear stages: elasticity, plasticity, and residual. According to the combination of the Tresca yield criterion and the thermal stress, a thermal elastoplastic coupling model was developed to calculate the radii of the plastic softening and broken zones. An example calculation showed that the shrunken thermal stress at the bottom of the borehole could enhance the stability of the borehole wall, while the expansive thermal stress at the top could increase the instability of the borehole. When thermal stress was considered, the thermal elastoplastic model of rock was more consistent with the field measurements than when it was neglected.Zhongxi ZhuChaofei WangYuchen YeWanneng LeiWileyarticlecomplete stress‐strainelastoplastic couplinggas drillingplastic softeningstrengththermal stressTechnologyTScienceQENEnergy Science & Engineering, Vol 9, Iss 12, Pp 2388-2399 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	complete stress‐strain elastoplastic coupling gas drilling plastic softening strength thermal stress Technology T Science Q
spellingShingle	complete stress‐strain elastoplastic coupling gas drilling plastic softening strength thermal stress Technology T Science Q Zhongxi Zhu Chaofei Wang Yuchen Ye Wanneng Lei Analysis of borehole stability in gas drilling using a thermal elastoplastic coupling model
description	Abstract Gas drilling causes lower pressure in the borehole and the Joule‐Thomson effect to occur at the bit nozzle, resulting in a temperature distribution in the borehole different from that in the original formation. The borehole temperature is far lower than the original formation temperature near the bottom of the borehole. This temperature difference leads to thermal stress on the borehole. The borehole temperature is higher than the formation temperature in the upper part of the borehole, causing the surrounding rock to expand because of the resulting thermal stress, which enhances the expansion of the surrounding rock into the borehole. The force supporting the borehole wall is thus weaker, and the borehole inevitably deforms under the original in situ stress. Meanwhile, the complete stress‐strain process of rock can be simplified into three linear stages: elasticity, plasticity, and residual. According to the combination of the Tresca yield criterion and the thermal stress, a thermal elastoplastic coupling model was developed to calculate the radii of the plastic softening and broken zones. An example calculation showed that the shrunken thermal stress at the bottom of the borehole could enhance the stability of the borehole wall, while the expansive thermal stress at the top could increase the instability of the borehole. When thermal stress was considered, the thermal elastoplastic model of rock was more consistent with the field measurements than when it was neglected.
format	article
author	Zhongxi Zhu Chaofei Wang Yuchen Ye Wanneng Lei
author_facet	Zhongxi Zhu Chaofei Wang Yuchen Ye Wanneng Lei
author_sort	Zhongxi Zhu
title	Analysis of borehole stability in gas drilling using a thermal elastoplastic coupling model
title_short	Analysis of borehole stability in gas drilling using a thermal elastoplastic coupling model
title_full	Analysis of borehole stability in gas drilling using a thermal elastoplastic coupling model
title_fullStr	Analysis of borehole stability in gas drilling using a thermal elastoplastic coupling model
title_full_unstemmed	Analysis of borehole stability in gas drilling using a thermal elastoplastic coupling model
title_sort	analysis of borehole stability in gas drilling using a thermal elastoplastic coupling model
publisher	Wiley
publishDate	2021
url	https://doaj.org/article/425748b925b8406899d045732bf5d732
work_keys_str_mv	AT zhongxizhu analysisofboreholestabilityingasdrillingusingathermalelastoplasticcouplingmodel AT chaofeiwang analysisofboreholestabilityingasdrillingusingathermalelastoplasticcouplingmodel AT yuchenye analysisofboreholestabilityingasdrillingusingathermalelastoplasticcouplingmodel AT wannenglei analysisofboreholestabilityingasdrillingusingathermalelastoplasticcouplingmodel
_version_	1718400405468086272

Analysis of borehole stability in gas drilling using a thermal elastoplastic coupling model

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