期刊
ENGINEERING FRACTURE MECHANICS
卷 211, 期 -, 页码 282-290出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfracmech.2019.02.011
关键词
Fracture toughness; Fractal; Model-I/II fracture; Fracability; Shale
类别
资金
- National Natural Science Foundation of China [51804042]
- Open Fund of Key Laboratory of Exploration Technologies for Oil and Gas Resources (Yangtze University), Ministry of Education [K2018-09]
- Scientific Research Plan by Hubei Provincial Department of Education [Q20181313]
- National Science and Technology Major Project Demonstration Project of the Development of shale Gas in Fuling-Technical Research of Geologic Modeling and Assessment of Recoverable Shale Gas Reserve in Fuling [2016ZX05060-002]
- Support Fund for Young Scientific Researchers in Yangtze University [2016cqn045]
Staged fracturing of a horizontal well may cause artificial fractures to intersect with weak structural planes, including a great number of natural fractures and stratifications in the shale, which will then form a complicated fracture network. Model-I and model-II are two common models of artificial fractures, and the fracture toughness of a different model is also different. This work starts with researching the micromorphology of model-I/II crack (fracture) and is on the basis of the fracture mechanics and the fractal theory. The fractal calculation method is applied to calculate the model-I/II fracture toughness, while the crystal splitting method is used to calculate the surface energy of the shale. The calculation results are obtained by using two parameters: density logging data and interval transit time. The comparison between the calculation results and the test results shows that the mean errors are 0.22% and -0.46%, respectively, which verifies the accuracy of the new method in calculating the fracture toughness. With reference to the shale horizontal well logging data, the integrated normalized fracture toughness index profile is calculated by using the fractal method. And, we have verified that it is accurate to use the fracability assessment method that is based on the fractal theory and the fracture toughness to guide the shale volume stimulation.
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