Integrity Analysis of the Sheath Considering Temperature Effect under Deep and Large-Scale Multi-Section Hydraulic Fracturing

Different operations make the borehole temperature change and cause periodic stresses, which often cause variations in the stress state of the sheath or damage. In this paper, the effect of temperature on sheath integrity is investigated. First, the mechanical model of sheath is established and anal...

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Autores principales:	Xiaoyu Zhang, Lei Wang, Chunhe Yang, Xin Chang, Yintong Guo, Zhenhui Bi, Hanzhi Yang
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	sheath cement shakedown theory temperature Technology T
Acceso en línea:	https://doaj.org/article/9f0e9750eaaf45b498144035d701dd16
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spelling	oai:doaj.org-article:9f0e9750eaaf45b498144035d701dd162021-11-11T15:56:32ZIntegrity Analysis of the Sheath Considering Temperature Effect under Deep and Large-Scale Multi-Section Hydraulic Fracturing10.3390/en142171621996-1073https://doaj.org/article/9f0e9750eaaf45b498144035d701dd162021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1073/14/21/7162https://doaj.org/toc/1996-1073Different operations make the borehole temperature change and cause periodic stresses, which often cause variations in the stress state of the sheath or damage. In this paper, the effect of temperature on sheath integrity is investigated. First, the mechanical model of sheath is established and analyzed by shakedown theory. Then, compression experiments of well cement at different temperatures are carried out, and the law of mechanical properties with temperature is obtained. Finally, combining the theoretical analysis and mechanical experiments, the results show that (1) when only the temperature inside the sheath cyclically varies, the negative influence of temperature caused by the practical operations can be negligible. (2) When the internal pressure and temperature act together, the effect of temperature on the sheath is reflected in temperature stress and the change of the cement properties. (3) With the increase of temperature difference (∆<i>T</i>), the cohesion of cement decreases while the internal friction angle increases, and the plasticity characteristics of the cement are enhanced, and the negative effect on the Pmax ascends slowly. (4) The temperature stress is in a positive relationship with the ∆<i>T</i>, and its weakening on the <i>P<sub>max</sub></i> is about 6% to 7%. (5) Combining the temperature stress and the change of the cement properties, total negative effect of temperature on the sheath accounts for 10% to 12%, when ∆<i>T</i> ranges from 60 to 110 °C.Xiaoyu ZhangLei WangChunhe YangXin ChangYintong GuoZhenhui BiHanzhi YangMDPI AGarticlesheathcementshakedown theorytemperatureTechnologyTENEnergies, Vol 14, Iss 7162, p 7162 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	sheath cement shakedown theory temperature Technology T
spellingShingle	sheath cement shakedown theory temperature Technology T Xiaoyu Zhang Lei Wang Chunhe Yang Xin Chang Yintong Guo Zhenhui Bi Hanzhi Yang Integrity Analysis of the Sheath Considering Temperature Effect under Deep and Large-Scale Multi-Section Hydraulic Fracturing
description	Different operations make the borehole temperature change and cause periodic stresses, which often cause variations in the stress state of the sheath or damage. In this paper, the effect of temperature on sheath integrity is investigated. First, the mechanical model of sheath is established and analyzed by shakedown theory. Then, compression experiments of well cement at different temperatures are carried out, and the law of mechanical properties with temperature is obtained. Finally, combining the theoretical analysis and mechanical experiments, the results show that (1) when only the temperature inside the sheath cyclically varies, the negative influence of temperature caused by the practical operations can be negligible. (2) When the internal pressure and temperature act together, the effect of temperature on the sheath is reflected in temperature stress and the change of the cement properties. (3) With the increase of temperature difference (∆<i>T</i>), the cohesion of cement decreases while the internal friction angle increases, and the plasticity characteristics of the cement are enhanced, and the negative effect on the Pmax ascends slowly. (4) The temperature stress is in a positive relationship with the ∆<i>T</i>, and its weakening on the <i>P<sub>max</sub></i> is about 6% to 7%. (5) Combining the temperature stress and the change of the cement properties, total negative effect of temperature on the sheath accounts for 10% to 12%, when ∆<i>T</i> ranges from 60 to 110 °C.
format	article
author	Xiaoyu Zhang Lei Wang Chunhe Yang Xin Chang Yintong Guo Zhenhui Bi Hanzhi Yang
author_facet	Xiaoyu Zhang Lei Wang Chunhe Yang Xin Chang Yintong Guo Zhenhui Bi Hanzhi Yang
author_sort	Xiaoyu Zhang
title	Integrity Analysis of the Sheath Considering Temperature Effect under Deep and Large-Scale Multi-Section Hydraulic Fracturing
title_short	Integrity Analysis of the Sheath Considering Temperature Effect under Deep and Large-Scale Multi-Section Hydraulic Fracturing
title_full	Integrity Analysis of the Sheath Considering Temperature Effect under Deep and Large-Scale Multi-Section Hydraulic Fracturing
title_fullStr	Integrity Analysis of the Sheath Considering Temperature Effect under Deep and Large-Scale Multi-Section Hydraulic Fracturing
title_full_unstemmed	Integrity Analysis of the Sheath Considering Temperature Effect under Deep and Large-Scale Multi-Section Hydraulic Fracturing
title_sort	integrity analysis of the sheath considering temperature effect under deep and large-scale multi-section hydraulic fracturing
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/9f0e9750eaaf45b498144035d701dd16
work_keys_str_mv	AT xiaoyuzhang integrityanalysisofthesheathconsideringtemperatureeffectunderdeepandlargescalemultisectionhydraulicfracturing AT leiwang integrityanalysisofthesheathconsideringtemperatureeffectunderdeepandlargescalemultisectionhydraulicfracturing AT chunheyang integrityanalysisofthesheathconsideringtemperatureeffectunderdeepandlargescalemultisectionhydraulicfracturing AT xinchang integrityanalysisofthesheathconsideringtemperatureeffectunderdeepandlargescalemultisectionhydraulicfracturing AT yintongguo integrityanalysisofthesheathconsideringtemperatureeffectunderdeepandlargescalemultisectionhydraulicfracturing AT zhenhuibi integrityanalysisofthesheathconsideringtemperatureeffectunderdeepandlargescalemultisectionhydraulicfracturing AT hanzhiyang integrityanalysisofthesheathconsideringtemperatureeffectunderdeepandlargescalemultisectionhydraulicfracturing
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Integrity Analysis of the Sheath Considering Temperature Effect under Deep and Large-Scale Multi-Section Hydraulic Fracturing

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