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Investigation on Flowback Behavior of Imbibition Fracturing Fluid in Gas–Shale Multiscale Pore Structure

Author

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  • Jiajia Bai

    (State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing 100083, China
    College of Petroleum Engineering, Changzhou University, Changzhou 213164, China)

  • Guoqing Wang

    (College of Petroleum Engineering, Changzhou University, Changzhou 213164, China)

  • Qingjie Zhu

    (College of Petroleum Engineering, Changzhou University, Changzhou 213164, China)

  • Lei Tao

    (College of Petroleum Engineering, Changzhou University, Changzhou 213164, China)

  • Wenyang Shi

    (College of Petroleum Engineering, Changzhou University, Changzhou 213164, China)

Abstract

To investigate the influence of flowback time and flowback difference on flowback behavior of shale fracturing fluid, we carried out the permeability test experiment of Longmaxi Formation shale under different flowback pressure gradients and analyzed the retention characteristics of water phase in shale pores and fractures after flowback by nuclear magnetic resonance (NMR) instrument. The results indicate that after flowback under the pressure gradient ranges of 0.06~0.18 MPa/cm, the content of retained water phase in shale samples ranges from 9.68% to 16.97% and the retention of fracturing fluid in shale does not decrease with the increase of flowback pressure difference. Additionally, increasing the flowback pressure difference will reduce the shale permeability damage rate, but the permeability damage rate is still above 80%. After the flowback, the water phase mainly stays in the pore space with D < 100 nm, especially in the pore space with 2~10 nm and 10~50 nm. It is extremely difficult for the water phase in the pores with D < 100 nm to flow back out. The experimental results show that the critical flowback pressure gradient for particle migration of rock powder in shale fracture surface is 0.09 MPa/cm. The research results have important guiding significance for shale gas well flowback.

Suggested Citation

  • Jiajia Bai & Guoqing Wang & Qingjie Zhu & Lei Tao & Wenyang Shi, 2022. "Investigation on Flowback Behavior of Imbibition Fracturing Fluid in Gas–Shale Multiscale Pore Structure," Energies, MDPI, vol. 15(20), pages 1-16, October.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:20:p:7802-:d:949620
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    References listed on IDEAS

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    1. Lutz Kilian, 2016. "The Impact of the Shale Oil Revolution on U.S. Oil and Gasoline Prices," Review of Environmental Economics and Policy, Association of Environmental and Resource Economists, vol. 10(2), pages 185-205.
    2. Yang, Haijun & Han, Xin & Wang, Li, 2021. "Is there a bubble in the shale gas market?," Energy, Elsevier, vol. 215(PA).
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    Cited by:

    1. Mohamed Mehana & Fangxuan Chen & Mashhad Fahes & Qinjun Kang & Hari Viswanathan, 2022. "Geochemical Modelling of the Fracturing Fluid Transport in Shale Reservoirs," Energies, MDPI, vol. 15(22), pages 1-13, November.

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