Fracture Initiation of an Inhomogeneous Shale Rock under a Pressurized Supercritical CO2 Jet

Due to the advantages of good fracture performance and the application of carbon capture and storage (CCS), supercritical carbon dioxide (SC-CO2) is considered a promising alternative for hydraulic fracturing. However, the fracture initiation mechanism and its propagation under pressurized SC-CO2 je...

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Bibliographic Details
Published in:Applied sciences 2017-10, Vol.7 (10), p.1093
Main Authors: Hu, Yi, Liu, Yiwei, Cai, Can, Kang, Yong, Wang, Xiaochuan, Huang, Man, Chen, Feng
Format: Article
Language:English
Subjects:
Carbon dioxide
Computer simulation
Crack initiation
Crack propagation
Fluid-structure interaction
fluid–structure coupling
Fracture mechanics
Hydraulic fracturing
hydro-jet fracturing
inhomogeneous shale
Mathematical models
Perforation
Pressurization
Probability distribution
Shale
Stress
Stress concentration
supercritical carbon dioxide
user-defined code
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Summary:Due to the advantages of good fracture performance and the application of carbon capture and storage (CCS), supercritical carbon dioxide (SC-CO2) is considered a promising alternative for hydraulic fracturing. However, the fracture initiation mechanism and its propagation under pressurized SC-CO2 jet are still unknown. To address these problems, a fluid–structure interaction (FSI)-based numerical simulation model along with a user-defined code was used to investigate the fracture initiation in an inhomogeneous shale rock. The mechanism of fracturing under the effect of SC-CO2 jet was explored, and the effects of various influencing factors were analyzed and discussed. The results indicated that higher velocity jets of SC-CO2 not only caused hydraulic-fracturing ring, but also resulted in the increase of stress in the shale rock. It was found that, with the increase of perforation pressure, more cracks initiated at the tip. In contrast, the length of cracks at the root decreased. The length-to-diameter ratio and the aperture ratio distinctly affected the pressurization of SC-CO2 jet, and contributed to the non-linear distribution and various maximum values of the stress in shale rock. The results proved that Weibull probability distribution was appropriate for analysis of the fracture initiation. The studied parameters explain the distribution of weak elements, and they affect the stress field in shale rock.
ISSN:2076-3417
2076-3417
DOI:10.3390/app7101093