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Induced Fractures and Production Behavior by Fracturing-Flooding in Tight Oil Formations

Author

Listed:
  • Jinshan Xu

    (Oil Production Technology Research Institute, PetroChina Xinjiang Oilfield Company, Karamay 834000, China)

  • Yonggang Yi

    (Oil Production Technology Research Institute, PetroChina Xinjiang Oilfield Company, Karamay 834000, China)

  • Xiang Dai

    (Development Division, Xinjiang Oilfield Company, Karamay 834000, China)

  • Xudong Luo

    (No. 2 Production Plant, Xinjiang Oilfield Company, Karamay 834000, China)

  • Tao Wan

    (Faculty of Petroleum, China University of Petroleum (Beijing) at Karamay, Karamay 834000, China)

Abstract

Conventional hydraulic fracturing aims to minimize the loss of fracturing fluid, with the fluid serving solely to generate fractures, whereas the fracturing-flooding process involves the injection of an agent that facilitates fracture generation without flowing back. This injection agent not only acts as a fracturing treatment but also engages in a displacement process. Currently, there exists a notable gap in systematic research concerning the mechanisms of production enhancement via fracturing-flooding. The characterization of the flow pattern and production behavior associated with fracturing-flooding remains unclear. By integrating physical laboratory experiments with numerical simulations, this study finds that an increase of the displacement pressure gradient can increase the matrix permeability by 10–20%. The residual oil distribution also transfers from a contiguous state to an oil film. It results in a smaller pore–throat size, so oil can be mobilized. Stepwise reduced rate injection leverages the advantages of short-wide fractures while enhancing lateral fracture complexity and oil production rates. Furthermore, we aim to quantitatively characterize the fractures resulting from fracturing-flooding at the microscale and to establish a physical simulation methodology for low-permeability sandstone.

Suggested Citation

  • Jinshan Xu & Yonggang Yi & Xiang Dai & Xudong Luo & Tao Wan, 2025. "Induced Fractures and Production Behavior by Fracturing-Flooding in Tight Oil Formations," Energies, MDPI, vol. 18(18), pages 1-16, September.
    • Handle: RePEc:gam:jeners:v:18:y:2025:i:18:p:4845-:d:1747568
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    References listed on IDEAS

    as
    1. Bing Xu & Yikun Liu & Yumei Wang & Guang Yang & Qiannan Yu & Fengjiao Wang, 2018. "A New Method and Application of Full 3D Numerical Simulation for Hydraulic Fracturing Horizontal Fracture," Energies, MDPI, vol. 12(1), pages 1-18, December.
    2. Wei, Jianguang & Zhang, Dong & Zhang, Xin & Zhao, Xiaoqing & Zhou, Runnan, 2023. "Experimental study on water flooding mechanism in low permeability oil reservoirs based on nuclear magnetic resonance technology," Energy, Elsevier, vol. 278(PB).
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