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Volume 26 Issue 3
Jul 2015
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Journal of Earth Science  > 2015  >  26(3): 407-415.
Shiqi Liu, Shuxun Sang, Qipeng Zhu, Jiefang Zhang, Hefeng Gao, Huihu Liu, Lixing Lin. Triple medium physical model of post fracturing high-rank coal reservoir in southern Qinshui Basin. Journal of Earth Science, 2015, 26(3): 407-415. doi: 10.1007/s12583-014-0501-z
Citation: Shiqi Liu, Shuxun Sang, Qipeng Zhu, Jiefang Zhang, Hefeng Gao, Huihu Liu, Lixing Lin. Triple medium physical model of post fracturing high-rank coal reservoir in southern Qinshui Basin. Journal of Earth Science, 2015, 26(3): 407-415. doi: 10.1007/s12583-014-0501-z
shu

Triple medium physical model of post fracturing high-rank coal reservoir in southern Qinshui Basin

doi: 10.1007/s12583-014-0501-z
  • 1.

    School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China

  • 2.

    Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process, Ministry of Education, School of Mineral Resource and Geoscience, China University of Mining and Technology, Xuzhou 221116, China

  • 3.

    School of Geoscience and Environment, Anhui University of Science and Technology, Huainan 232001, China

  • 4.

    Faculty of Engineering and Applied Science, University of Regina, Regina S4S0A2, Canada

More Information
  • Corresponding author: Shuxun Sang, shuxunsang@163.com
  • Received Date: 25 Jun 2014
  • Accepted Date: 26 Oct 2014
  • Publish Date: 01 Jun 2015
    Abstract
  • In this paper, influences on the reservoir permeability, the reservoir architecture and the fluid flow pattern caused by hydraulic fracturing are analyzed. Based on the structure and production fluid flow model of post fracturing high-rank coal reservoir, Warren-Root Model is improved. A new physical model that is more suitable for post fracturing high-rank coal reservoir is established. The results show that the width, the flow conductivity and the permeability of hydraulic fractures are much larger than natural fractures in coal bed reservoir. Hydraulic fracture changes the flow pattern of gas and flow channel to wellbore, thus should be treated as an independent medium. Warrant-Root Model has some limitations and can't give a comprehensive interpretation of seepage mechanism in post fracturing high-rank coal reservoir. Modified Warrant-Root Model simplifies coal bed reservoir to an ideal system with hydraulic fracture, orthogonal macroscopic fracture and cuboid matrix. Hydraulic fracture is double wing, vertical and symmetric to wellbore. Coal bed reservoir is divided into cuboids by hydraulic fracture and further by macroscopic fractures. Flow behaviors in coal bed reservoir are simplified to three step flows of gas and two step flows of water. The swap mode of methane between coal matrix and macroscopic fractures is pseudo steady fluid channeling. The flow behaviors of methane to wellbore no longer follow Darcy's Law and are mainly affected by inertia force. The flow pattern of water follows Darcy's Law. The new physical model is more suitable for post fracturing high-rank coal reservoir.

     

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