Optimization of Multi-Cluster Fracturing Model under the Action of Induced Stress in Horizontal Wells
Volume fracturing in shale gas forms complex fracture networks and increases stimulated reservoir volume through large-scale fracturing operation with plug-perforation technology. However, some perforation clusters are stimulated unevenly after fracturing. This study aims to solve this problem by...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Eastern Macedonia and Thrace Institute of Technology
2016-05-01
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| Series: | Journal of Engineering Science and Technology Review |
| Subjects: | |
| Online Access: | http://www.jestr.org/downloads/Volume9Issue2/fulltext10922016.pdf |
| Summary: | Volume fracturing in shale gas forms complex fracture networks and increases stimulated reservoir volume through
large-scale fracturing operation with plug-perforation technology. However, some perforation clusters are stimulated
unevenly after fracturing. This study aims to solve this problem by analyzing the shortcomings of the conventional
fracturing model and developing a coupled model based on the 2D fracture motion equation, energy conservation law,
linear elastic mechanics, and stress superposition principle. First, a multi-fracture in-situ stress model was built by
studying the induced stress produced by the fracture initiation to deduce the multi-fracture induced stress impact factor on
the basis of the stress superposition principle. Then, the classical Perkins–Kern–Nordgren model was utilized with the
crustal stress model. Finally, a precise fracturing design method was used to optimize perforation and fracturing
parameters under the new model. Results demonstrate that the interference effect among fractures is the major factor
causing the non-uniform propagation of each fracture. Compression on the main horizontal stress increases the net
pressure. Therefore, both the degree of operation difficulty and the complexity of fracture geometry are improved. After
applying the optimal design, the production is increased by 20%, and the cost is reduced by 15%. |
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| ISSN: | 1791-2377 1791-2377 |