Applications of Micro-Indentation Technology to Estimate Fracture Toughness of Shale
The fracture toughness of shale is a basic parameter that can provide effective theoretical support for wellbore stability and hydraulic fracturing of a shale reservoir. Due to the composition and microstructure, there are many problems in evaluating the mechanical properties of shale in a macroscop...
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MDPI AG
2020-09-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/13/18/4208 |
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| author | Qiang Han Zhan Qu Ping Wang Gang Bi Guanzheng Qu |
| author_facet | Qiang Han Zhan Qu Ping Wang Gang Bi Guanzheng Qu |
| author_sort | Qiang Han |
| collection | DOAJ |
| description | The fracture toughness of shale is a basic parameter that can provide effective theoretical support for wellbore stability and hydraulic fracturing of a shale reservoir. Due to the composition and microstructure, there are many problems in evaluating the mechanical properties of shale in a macroscopic test. In this paper, the composition and pore distribution of shale were studied by X-ray diffraction and nuclear magnetic resonance. Scanning electron microscopy was used to characterize the pore structure. The setting of experimental parameters and the selection of the indenter were discussed. Micro-indentation technique was proposed and applied to fracture toughness analysis of shale. The results show that Berkovich indenter is more suitable for shale indentation test than Vickers indenter. Fracture toughness of shale indentation is obviously affected by surface roughness and indentation position. Fracture toughness of shale decreases slightly with the increase of the indentation load. The energy analysis result presents that the effect of cracking on the ratio of total/unloading work is minimal when there is no significant stripping on the shale surface. Compared with the experimental method, energy methods can obtain all the analysis parameters from a single indentation test. The results of comparative analysis with macroscopic experiments display that micro-indentation test can effectively predict the macroscopic fracture toughness of shale. |
| first_indexed | 2024-03-10T16:08:54Z |
| format | Article |
| id | doaj.art-9f3aec19acc247d28208e01d39459466 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T16:08:54Z |
| publishDate | 2020-09-01 |
| publisher | MDPI AG |
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| series | Materials |
| spelling | doaj.art-9f3aec19acc247d28208e01d394594662023-11-20T14:38:06ZengMDPI AGMaterials1996-19442020-09-011318420810.3390/ma13184208Applications of Micro-Indentation Technology to Estimate Fracture Toughness of ShaleQiang Han0Zhan Qu1Ping Wang2Gang Bi3Guanzheng Qu4College of petroleum engineering, Xi’an Shiyou University, Xi’an 710065, ChinaCollege of petroleum engineering, Xi’an Shiyou University, Xi’an 710065, ChinaCollege of petroleum engineering, Xi’an Shiyou University, Xi’an 710065, ChinaCollege of petroleum engineering, Xi’an Shiyou University, Xi’an 710065, ChinaCollege of petroleum engineering, Xi’an Shiyou University, Xi’an 710065, ChinaThe fracture toughness of shale is a basic parameter that can provide effective theoretical support for wellbore stability and hydraulic fracturing of a shale reservoir. Due to the composition and microstructure, there are many problems in evaluating the mechanical properties of shale in a macroscopic test. In this paper, the composition and pore distribution of shale were studied by X-ray diffraction and nuclear magnetic resonance. Scanning electron microscopy was used to characterize the pore structure. The setting of experimental parameters and the selection of the indenter were discussed. Micro-indentation technique was proposed and applied to fracture toughness analysis of shale. The results show that Berkovich indenter is more suitable for shale indentation test than Vickers indenter. Fracture toughness of shale indentation is obviously affected by surface roughness and indentation position. Fracture toughness of shale decreases slightly with the increase of the indentation load. The energy analysis result presents that the effect of cracking on the ratio of total/unloading work is minimal when there is no significant stripping on the shale surface. Compared with the experimental method, energy methods can obtain all the analysis parameters from a single indentation test. The results of comparative analysis with macroscopic experiments display that micro-indentation test can effectively predict the macroscopic fracture toughness of shale.https://www.mdpi.com/1996-1944/13/18/4208shalemicro-indentationmechanical propertyfracture toughness |
| spellingShingle | Qiang Han Zhan Qu Ping Wang Gang Bi Guanzheng Qu Applications of Micro-Indentation Technology to Estimate Fracture Toughness of Shale Materials shale micro-indentation mechanical property fracture toughness |
| title | Applications of Micro-Indentation Technology to Estimate Fracture Toughness of Shale |
| title_full | Applications of Micro-Indentation Technology to Estimate Fracture Toughness of Shale |
| title_fullStr | Applications of Micro-Indentation Technology to Estimate Fracture Toughness of Shale |
| title_full_unstemmed | Applications of Micro-Indentation Technology to Estimate Fracture Toughness of Shale |
| title_short | Applications of Micro-Indentation Technology to Estimate Fracture Toughness of Shale |
| title_sort | applications of micro indentation technology to estimate fracture toughness of shale |
| topic | shale micro-indentation mechanical property fracture toughness |
| url | https://www.mdpi.com/1996-1944/13/18/4208 |
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