Artificial Interference of Stress Field in a Near-Fracture Zone by Water Injection in a Preexisting Crack

The in situ stress has an important influence on fracture propagation and fault stability in deep formation. However, the development of oil and gas resources can only be determined according to the existing state of in situ stress in most cases. It is passive acceptance of existing in situ stress....

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Bibliographic Details
Published in:Advances in civil engineering 2019, Vol.2019 (2019), p.1-15
Main Authors: Zheng, Yongxiang, Zhang, Bohu, Liu, Jianjun
Format: Article
Language:English
Subjects:
Channeling
Civil engineering
Crack propagation
Critical pressure
Exploitation
Fault lines
Fluid pressure
Fracture mechanics
Fractured reservoirs
Gasoline
Hydraulic fracturing
Interference
Numerical analysis
Plate tectonics
Propagation
Stress distribution
Stress propagation
Water flooding
Water injection
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Summary:The in situ stress has an important influence on fracture propagation and fault stability in deep formation. However, the development of oil and gas resources can only be determined according to the existing state of in situ stress in most cases. It is passive acceptance of existing in situ stress. Unfortunately, in some cases, the in situ stress conditions are not conducive to resource development. If the in situ stress can be interfered in some ways, the stress can be adjusted to a more favorable state. In order to explore the method of artificial interference, this paper established the calculation method of the in situ stress around the cracks based on fracture mechanics at first and obtained the redistribution law of the in situ stress. Based on the obtained redistribution law, attempts were made to interfere with the surrounding in situ stress by water injection in the preexisting crack. On this basis, the artificial stress intervention was applied. The results show that artificial interference of stress can effectively be achieved by water injection in the fracture. And changing the fluid pressure in the crack is the most effective way. By stress artificial intervention, critical pressure for water channelling in fractured reservoirs, directional propagation of cracks in hydraulic fracturing, and stress adjustment on the structural plane were applied. This study provides guidance for artificial stress intervention in the exploitation of the underground resource.
ISSN:1687-8086
1687-8094
DOI:10.1155/2019/2307809