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Numerical Simulation of Waterflooding Mechanism in Fractured-Vuggy Reservoir Based on Phase-Field Method

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Proceedings of the International Field Exploration and Development Conference 2020 (IFEDC 2020)

Part of the book series: Springer Series in Geomechanics and Geoengineering ((SSGG))

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Abstract

The reservoir space of fractured-vuggy reservoir is composed of pores, fractures, and vugs. And the complicated structure of fractures and vugs makes the flow of oil and water very complicated. To strengthen the understanding of the mechanism of waterflooding in a fractured-vuggy reservoir, a fracture-vug network model with a complex structure is constructed in this paper. Based on the phase-field method and the N-S equation, the numerical simulation analysis of the two-phase flow is carried out. The results show that the location and velocity of water injection are the main factors affecting the efficiency of waterflooding; the significant difference in viscosity between oil and water increases the instability of oil and water flow, which is not conducive to the process of waterflooding; and the distribution of the remaining oil in vugs is determined by the coordination number and the connected position of fractures. And the types of remaining oil after waterflooding mainly include attic oil at high position and above the connected position of fractures, remaining oil in blind end vugs and fractures, remaining oil shielded by dominant channel, and stuck in the fractures. Based on the two-phase flow method of interface tracing, this paper analyzes the key factors affecting the waterflooding efficiency, further clarifies the oil-water flow mechanism of the complex fracture-vug network, and intuitively shows the oil-water distribution and remaining oil types. This work provides a theoretical basis for further improving the waterflooding efficiency of fractured-vuggy reservoirs.

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Acknowledgments

This work is supported by the National High Technology Research & Development Program of China (Number 2016ZX05053–002).

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Authors and Affiliations

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

    Guang Lu & Yu-long Zhao

  2. Baikouquan Oil Production Plant, Xinjiang Oilfield Branch, PetroChina, Karamay, China

    Xu-yang Zhang

  3. Capital Construction Engineering Office, Xinjiang Oilfield Branch, PetroChina, Karamay, China

    Xiao-ping Tao

Authors
  1. Guang Lu
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  2. Yu-long Zhao
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  3. Xu-yang Zhang
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  4. Xiao-ping Tao
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Corresponding author

Correspondence to Yu-long Zhao .

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Editors and Affiliations

  1. College of Petroleum Engineering, Xi'an Shiyou University, Xi’an, Shaanxi, China

    Jia'en Lin

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Lu, G., Zhao, Yl., Zhang, Xy., Tao, Xp. (2021). Numerical Simulation of Waterflooding Mechanism in Fractured-Vuggy Reservoir Based on Phase-Field Method. In: Lin, J. (eds) Proceedings of the International Field Exploration and Development Conference 2020. IFEDC 2020. Springer Series in Geomechanics and Geoengineering. Springer, Singapore. https://doi.org/10.1007/978-981-16-0761-5_208

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  • DOI: https://doi.org/10.1007/978-981-16-0761-5_208

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  • Publisher Name: Springer, Singapore

  • Print ISBN: 978-981-16-0762-2

  • Online ISBN: 978-981-16-0761-5

  • eBook Packages: EngineeringEngineering (R0)

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