Understanding the creep behavior of shale via nano-DMA method

Understanding the creep behavior of shale is essential to precisely predict borehole instability issues and model fracturing of unconventional shale reservoirs. In this study, the creep behavior of shale in micron scale is investigated by integrating the nano-dynamic mechanical analysis (nano-DMA) g...

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Autores principales:	Kouqi Liu, Zhijun Jin, Lianbo Zeng, Mehdi Ostadhassan, Xiaomeng Xu
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Shale Creep behavior Nano-DMA Contact creep modulus Electrical engineering. Electronics. Nuclear engineering TK1-9971
Acceso en línea:	https://doaj.org/article/572c7888039f490982ddb1090271c4e7
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spelling	oai:doaj.org-article:572c7888039f490982ddb1090271c4e72021-11-18T04:50:10ZUnderstanding the creep behavior of shale via nano-DMA method2352-484710.1016/j.egyr.2021.10.099https://doaj.org/article/572c7888039f490982ddb1090271c4e72021-11-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2352484721011185https://doaj.org/toc/2352-4847Understanding the creep behavior of shale is essential to precisely predict borehole instability issues and model fracturing of unconventional shale reservoirs. In this study, the creep behavior of shale in micron scale is investigated by integrating the nano-dynamic mechanical analysis (nano-DMA) grid nanoindentation (15 × 15 indents) and data clustering techniques. The results showed that the creep displacement, the creep rate, and hardness, both can be related through a logarithmic function with creep time. Furthermore, contact creep modulus increased as the hardness or Young’s modulus increased. The clustering analysis revealed that three separate phases are present in the samples where Phase 1(clay/organic matter) has the smallest contact creep modulus and Phase 3 (quartz) the largest. While creep is in progress, the creep displacement, hardness and contact creep modulus of all three phases obey the logarithmic function. Under the same creep time, reduction in the contact creep modulus of Phase 3 appears to be faster than Phase 1 while the creep rate of Phase 3 is much less than Phase 1. Ultimately, contact creep modulus is better correlated with hardness than Young’s modulus.Kouqi LiuZhijun JinLianbo ZengMehdi OstadhassanXiaomeng XuElsevierarticleShaleCreep behaviorNano-DMAContact creep modulusElectrical engineering. Electronics. Nuclear engineeringTK1-9971ENEnergy Reports, Vol 7, Iss , Pp 7478-7487 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Shale Creep behavior Nano-DMA Contact creep modulus Electrical engineering. Electronics. Nuclear engineering TK1-9971
spellingShingle	Shale Creep behavior Nano-DMA Contact creep modulus Electrical engineering. Electronics. Nuclear engineering TK1-9971 Kouqi Liu Zhijun Jin Lianbo Zeng Mehdi Ostadhassan Xiaomeng Xu Understanding the creep behavior of shale via nano-DMA method
description	Understanding the creep behavior of shale is essential to precisely predict borehole instability issues and model fracturing of unconventional shale reservoirs. In this study, the creep behavior of shale in micron scale is investigated by integrating the nano-dynamic mechanical analysis (nano-DMA) grid nanoindentation (15 × 15 indents) and data clustering techniques. The results showed that the creep displacement, the creep rate, and hardness, both can be related through a logarithmic function with creep time. Furthermore, contact creep modulus increased as the hardness or Young’s modulus increased. The clustering analysis revealed that three separate phases are present in the samples where Phase 1(clay/organic matter) has the smallest contact creep modulus and Phase 3 (quartz) the largest. While creep is in progress, the creep displacement, hardness and contact creep modulus of all three phases obey the logarithmic function. Under the same creep time, reduction in the contact creep modulus of Phase 3 appears to be faster than Phase 1 while the creep rate of Phase 3 is much less than Phase 1. Ultimately, contact creep modulus is better correlated with hardness than Young’s modulus.
format	article
author	Kouqi Liu Zhijun Jin Lianbo Zeng Mehdi Ostadhassan Xiaomeng Xu
author_facet	Kouqi Liu Zhijun Jin Lianbo Zeng Mehdi Ostadhassan Xiaomeng Xu
author_sort	Kouqi Liu
title	Understanding the creep behavior of shale via nano-DMA method
title_short	Understanding the creep behavior of shale via nano-DMA method
title_full	Understanding the creep behavior of shale via nano-DMA method
title_fullStr	Understanding the creep behavior of shale via nano-DMA method
title_full_unstemmed	Understanding the creep behavior of shale via nano-DMA method
title_sort	understanding the creep behavior of shale via nano-dma method
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/572c7888039f490982ddb1090271c4e7
work_keys_str_mv	AT kouqiliu understandingthecreepbehaviorofshaleviananodmamethod AT zhijunjin understandingthecreepbehaviorofshaleviananodmamethod AT lianbozeng understandingthecreepbehaviorofshaleviananodmamethod AT mehdiostadhassan understandingthecreepbehaviorofshaleviananodmamethod AT xiaomengxu understandingthecreepbehaviorofshaleviananodmamethod
_version_	1718424973401391104

Understanding the creep behavior of shale via nano-DMA method

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