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Simulation of Mechanism of Hydraulic Fracture Propagation in Fracture-Cavity Reservoirs

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Chemistry and Technology of Fuels and Oils Aims and scope

Acid fracturing is a key measure to increase production of fracture-cavity reservoirs. Affected by the fracture-cavity system, hydraulic fractures will not propagate in a plane, and the mechanism of hydraulic fracture propagation is complicated. Therefore, considering the characteristics of hydraulic fracture propagation in fracture-cavity reservoirs, we established an extended finite element (XTEM) model for hydraulic fractures in fracture-cavity reservoirs. The simulation discussed hydraulic fracture extension in cases of a single cave and a single natural fracture and revealed the mechanism of dynamic propagation and extension of hydraulic fractures. The results indicated severe stress concentrations near caves, resulting in deflections of the fracture propagation direction. In the case of a single cave, upon shifts of shafts from the central line of the cave, the conditions of penetration of the cave by hydraulic fractures were investigated. It was shown that in the case of small approaching angles, the hydraulic fractures tend to deflect and join natural fractures; also, the hydraulic fractures can deflect and join natural fractures with large approaching angles and weak cementation. Generally small approaching angles and long natural fractures tend to induce hydraulic fractures and assist propagation towards the caves, thus increasing the probability of cave penetration.

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Declaration of Conflicting Interests

The authors declare that there are no conicts of interest regarding the publication of this paper.

Funding

This work was supported by the National Science and Technology Major Projects (12016ZX05014). This support is gratefully acknowledged.

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Authors and Affiliations

  1. Sinopec Northwest Oilfield Branch, Research Institute of Petroleum Engineering, Xinjiang, China

    Haiyang Zhao, Zhiyuan Liu, Yongshou Li & Nan Li

  2. State Rey Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, China

    Yaozeng Xie & Liqiang Zhao

Authors
  1. Haiyang Zhao
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  2. Yaozeng Xie
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  3. Liqiang Zhao
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  4. Zhiyuan Liu
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  5. Yongshou Li
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  6. Nan Li
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Corresponding author

Correspondence to Liqiang Zhao.

Additional information

Translated from Khimiya i Tekhnologiya Topliv i Masel, No. 6, pp. 104 - Ill, November - December, 2019.

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Zhao, H., Xie, Y., Zhao, L. et al. Simulation of Mechanism of Hydraulic Fracture Propagation in Fracture-Cavity Reservoirs. Chem Technol Fuels Oils 55, 814–827 (2020). https://doi.org/10.1007/s10553-020-01096-9

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  • DOI: https://doi.org/10.1007/s10553-020-01096-9

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