Numerical simulation study on the crack propagation of conglomerate
The conglomerate reservoir is rich in oil and gas reserves; however, the gravel's mechanical properties and laws are difficult to gain through laboratory experiments, which furthermore constrain the hydraulic fracturing design. To analyse the failure law of conglomerate, we simulated the uniaxi...
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The Royal Society
2021-07-01
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| Series: | Royal Society Open Science |
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| Online Access: | https://royalsocietypublishing.org/doi/10.1098/rsos.202178 |
| _version_ | 1818655416234541056 |
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| author | Senlin Luo Hongkui Ge Jianbo Wang Wei Zhou Yinghao Shen Pengyu Liu Jiantong Liu |
| author_facet | Senlin Luo Hongkui Ge Jianbo Wang Wei Zhou Yinghao Shen Pengyu Liu Jiantong Liu |
| author_sort | Senlin Luo |
| collection | DOAJ |
| description | The conglomerate reservoir is rich in oil and gas reserves; however, the gravel's mechanical properties and laws are difficult to gain through laboratory experiments, which furthermore constrain the hydraulic fracturing design. To analyse the failure law of conglomerate, we simulated the uniaxial compression test based on discrete element software PFC2D and analysed the effect of different cementation strength, gravel content and gravel geometry on the rock deformation and failure characteristics. Results show that (i) as the cementation strength decreases, the compressive strength and elasticity modulus both reduce clearly, while the crack shapes get more complex and the critical value is 0.3; (ii) as the gravel content increases, the conglomerate strength first decreases then increases under the influences of cracks bypassing gravels; cementation strength and gravel content of the conglomerate both contribute to the increase in local additional stress, which leads to a series of changes in crack shapes and mechanical properties of the conglomerate. Based on the above research, the conglomerate strength and crack shapes after failure are relatively complex due to the common influence of cementation strength and gravel content. The gravel edge crack caused by stress concentration is the micro-mechanism that affects the conglomerate mechanical properties. |
| first_indexed | 2024-12-17T03:09:20Z |
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| id | doaj.art-fae518baedc84bc79fe6648202eb91f1 |
| institution | Directory Open Access Journal |
| issn | 2054-5703 |
| language | English |
| last_indexed | 2024-12-17T03:09:20Z |
| publishDate | 2021-07-01 |
| publisher | The Royal Society |
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| spelling | doaj.art-fae518baedc84bc79fe6648202eb91f12022-12-21T22:05:53ZengThe Royal SocietyRoyal Society Open Science2054-57032021-07-018710.1098/rsos.202178Numerical simulation study on the crack propagation of conglomerateSenlin Luo0Hongkui Ge1Jianbo Wang2Wei Zhou3Yinghao Shen4Pengyu Liu5Jiantong Liu6Department of Petroleum Engineering, China University of Petroleum (Beijing) at Karamay, Xinjiang, Karamay 834000, People's Republic of ChinaDepartment of Petroleum Engineering, China University of Petroleum (Beijing) at Karamay, Xinjiang, Karamay 834000, People's Republic of ChinaDepartment of Petroleum Engineering, China University of Petroleum (Beijing) at Karamay, Xinjiang, Karamay 834000, People's Republic of ChinaResearch Institute of Experiment and Detection of Xinjiang Oilfield Company, Xinjiang, Karamay 834000, People's Republic of ChinaUnconventional Oil and Gas Technology Research Institute, China University of Petroleum, Beijing 102249, People's Republic of ChinaUnconventional Oil and Gas Technology Research Institute, China University of Petroleum, Beijing 102249, People's Republic of ChinaUnconventional Oil and Gas Technology Research Institute, China University of Petroleum, Beijing 102249, People's Republic of ChinaThe conglomerate reservoir is rich in oil and gas reserves; however, the gravel's mechanical properties and laws are difficult to gain through laboratory experiments, which furthermore constrain the hydraulic fracturing design. To analyse the failure law of conglomerate, we simulated the uniaxial compression test based on discrete element software PFC2D and analysed the effect of different cementation strength, gravel content and gravel geometry on the rock deformation and failure characteristics. Results show that (i) as the cementation strength decreases, the compressive strength and elasticity modulus both reduce clearly, while the crack shapes get more complex and the critical value is 0.3; (ii) as the gravel content increases, the conglomerate strength first decreases then increases under the influences of cracks bypassing gravels; cementation strength and gravel content of the conglomerate both contribute to the increase in local additional stress, which leads to a series of changes in crack shapes and mechanical properties of the conglomerate. Based on the above research, the conglomerate strength and crack shapes after failure are relatively complex due to the common influence of cementation strength and gravel content. The gravel edge crack caused by stress concentration is the micro-mechanism that affects the conglomerate mechanical properties.https://royalsocietypublishing.org/doi/10.1098/rsos.202178conglomerategravel contentmechanical propertiesmicrofracture evolutionhydraulic fracturing |
| spellingShingle | Senlin Luo Hongkui Ge Jianbo Wang Wei Zhou Yinghao Shen Pengyu Liu Jiantong Liu Numerical simulation study on the crack propagation of conglomerate Royal Society Open Science conglomerate gravel content mechanical properties microfracture evolution hydraulic fracturing |
| title | Numerical simulation study on the crack propagation of conglomerate |
| title_full | Numerical simulation study on the crack propagation of conglomerate |
| title_fullStr | Numerical simulation study on the crack propagation of conglomerate |
| title_full_unstemmed | Numerical simulation study on the crack propagation of conglomerate |
| title_short | Numerical simulation study on the crack propagation of conglomerate |
| title_sort | numerical simulation study on the crack propagation of conglomerate |
| topic | conglomerate gravel content mechanical properties microfracture evolution hydraulic fracturing |
| url | https://royalsocietypublishing.org/doi/10.1098/rsos.202178 |
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