期刊
COMPUTERS AND GEOTECHNICS
卷 117, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compgeo.2019.103226
关键词
Hydraulic fracturing; Discrete element method; Stress-shadowing effect; Simultaneous multiple fractures; Formation heterogeneity
类别
资金
- National Key Research Development Project of China [2016YFC0401804]
- Taishan Scholars Project Foundation of Shandong Province
- Natural Science Foundation Project of China [41772282, 51909138]
This study aims to uncover the growth characteristics of simultaneously-induced multiple hydraulic fractures using the discrete element method. We evaluate the influences of in-situ states and operational parameters on the fracture trajectories. Results reveal that reservoir heterogeneity magnifies the stress-shadowing effect and causes severe interactions among fractures. Higher effective stress anisotropy offsets the stress-shadowing effect and force the fractures to propagate in the direction of maximum stress and results in relative long parallel fractures. Increasing the spacing can mitigate the stress-shadowing effect to some degree. Injection rate and fluid viscosity have a less significant influence on the interactions among fractures.
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