| Autor: |
Antinao Fuentealba, Fabián J., Blanco, Gonzalo, Bianchi, Leandro N., Otegui, José L., Bianchi, Gustavo L. |
| Zdroj: |
Geoenergy Science and Engineering; 20230101, Issue: Preprints |
| Abstrakt: |
Brittle rock fracture is a core concept in oil and gas and other rock mechanics projects. However, the understanding of fracture behavior under mechanical well-bottom conditions remains insufficient. This article aims to analyze experimental results for the critical stress intensity factor (KIC) of outcrops from Vaca Muerta carbonate-rich shale rocks, tested under a range of crack depths and confining pressures (0–70 MPa). Fracture toughness (KIC) is determined in multi-notched 1.5″ plugs using a novel experimental set up, in which the crack-driving-force KIand the confinement pressure are both applied by hydraulic systems. Finite fracture-mechanics-based models are used to calculate KI. Our experimental results show that tests carried out at well-bottom pressures lead to apparent rock toughness doubling those for tests at atmospheric pressure. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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