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Using Nanoindentation to Characterize the Mechanical and Creep Properties of Shale: Load and Loading Strain Rate Effects
[Image: see text] The mechanical and creep properties of shale strongly influence artificial hydraulic fracturing, wellbore stability, and the evaluation of reservoir performance in shale gas exploration. This study characterized these mechanical and creep properties at the microscale through nanoin...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Chemical Society
2022
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9089696/ https://www.ncbi.nlm.nih.gov/pubmed/35573216 http://dx.doi.org/10.1021/acsomega.2c01190 |
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author | Wang, Jianfeng Yang, Chao Liu, Yuke Li, Yun Xiong, Yongqiang |
author_facet | Wang, Jianfeng Yang, Chao Liu, Yuke Li, Yun Xiong, Yongqiang |
author_sort | Wang, Jianfeng |
collection | PubMed |
description | [Image: see text] The mechanical and creep properties of shale strongly influence artificial hydraulic fracturing, wellbore stability, and the evaluation of reservoir performance in shale gas exploration. This study characterized these mechanical and creep properties at the microscale through nanoindentation tests and evaluated their dependence on the indentation test parameters, specifically, the indentation load and the loading strain rate. The mechanical parameters (the Young’s modulus and hardness) of shale were strongly influenced by the magnitude of an indentation load (2–400 mN). Both parameters decreased sharply as the load increased from 2 to 200 mN; they then remained relatively stable at loads of 200–400 mN, suggesting that large indentation loads (200–400 mN) can be used to detect the mechanical responses of bulk shale. In contrast, both parameters increased slightly as the loading strain rate increased from 0.005 to 0.1 s(–1). The indentation creep (C(IT)), related to creep behavior, and the creep strain rate sensitivity (m), related to the creep mechanism of shale, both increased with increasing the indentation load, whereas they decreased with increasing the loading strain rate. This demonstrates that increasing the load or decreasing the loading strain rate can increase creep deformation in shale during nanoindentation creep testing. The values of m varied from 0.040 to 0.124 under different loading conditions, suggesting that dislocation power-law creep may be the main mechanism controlling creep in shale. This study standardizes the testing parameters for the characterization of the mechanical properties of shale by nanoindentation testing and also advances our understanding of the deformation mechanisms of shale at the microscale. |
format | Online Article Text |
id | pubmed-9089696 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | American Chemical Society |
record_format | MEDLINE/PubMed |
spelling | pubmed-90896962022-05-12 Using Nanoindentation to Characterize the Mechanical and Creep Properties of Shale: Load and Loading Strain Rate Effects Wang, Jianfeng Yang, Chao Liu, Yuke Li, Yun Xiong, Yongqiang ACS Omega [Image: see text] The mechanical and creep properties of shale strongly influence artificial hydraulic fracturing, wellbore stability, and the evaluation of reservoir performance in shale gas exploration. This study characterized these mechanical and creep properties at the microscale through nanoindentation tests and evaluated their dependence on the indentation test parameters, specifically, the indentation load and the loading strain rate. The mechanical parameters (the Young’s modulus and hardness) of shale were strongly influenced by the magnitude of an indentation load (2–400 mN). Both parameters decreased sharply as the load increased from 2 to 200 mN; they then remained relatively stable at loads of 200–400 mN, suggesting that large indentation loads (200–400 mN) can be used to detect the mechanical responses of bulk shale. In contrast, both parameters increased slightly as the loading strain rate increased from 0.005 to 0.1 s(–1). The indentation creep (C(IT)), related to creep behavior, and the creep strain rate sensitivity (m), related to the creep mechanism of shale, both increased with increasing the indentation load, whereas they decreased with increasing the loading strain rate. This demonstrates that increasing the load or decreasing the loading strain rate can increase creep deformation in shale during nanoindentation creep testing. The values of m varied from 0.040 to 0.124 under different loading conditions, suggesting that dislocation power-law creep may be the main mechanism controlling creep in shale. This study standardizes the testing parameters for the characterization of the mechanical properties of shale by nanoindentation testing and also advances our understanding of the deformation mechanisms of shale at the microscale. American Chemical Society 2022-04-14 /pmc/articles/PMC9089696/ /pubmed/35573216 http://dx.doi.org/10.1021/acsomega.2c01190 Text en © 2022 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by-nc-nd/4.0/Permits non-commercial access and re-use, provided that author attribution and integrity are maintained; but does not permit creation of adaptations or other derivative works (https://creativecommons.org/licenses/by-nc-nd/4.0/). |
spellingShingle | Wang, Jianfeng Yang, Chao Liu, Yuke Li, Yun Xiong, Yongqiang Using Nanoindentation to Characterize the Mechanical and Creep Properties of Shale: Load and Loading Strain Rate Effects |
title | Using Nanoindentation to Characterize the Mechanical
and Creep Properties of Shale: Load and Loading Strain Rate Effects |
title_full | Using Nanoindentation to Characterize the Mechanical
and Creep Properties of Shale: Load and Loading Strain Rate Effects |
title_fullStr | Using Nanoindentation to Characterize the Mechanical
and Creep Properties of Shale: Load and Loading Strain Rate Effects |
title_full_unstemmed | Using Nanoindentation to Characterize the Mechanical
and Creep Properties of Shale: Load and Loading Strain Rate Effects |
title_short | Using Nanoindentation to Characterize the Mechanical
and Creep Properties of Shale: Load and Loading Strain Rate Effects |
title_sort | using nanoindentation to characterize the mechanical
and creep properties of shale: load and loading strain rate effects |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9089696/ https://www.ncbi.nlm.nih.gov/pubmed/35573216 http://dx.doi.org/10.1021/acsomega.2c01190 |
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