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The research on permeable model of hydraulic fractureand its application in the “three soft” coal seam

Wang Zhi-rong1，He Ping1，Guo Zhi-wei1，Chen Lin-xia1，Xu Pei-yuan2，3   

  1. 1.College of Environmental and Hydraulic Engineering, Zhengzhou University, Zhengzhou 450001, China；
    2.Henan Coalfield Geology Bureau, Zhengzhou 450053, China；
    3. Research Centre of Energy Engineering of Henan, Zhengzhou 450053, China
  • Received:2016-08-24 Revised:2017-01-07 Online:2017-03-10 Published:2017-03-10

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Abstract:

In order to find out the crack propagation law in hydraulic fracturing conditions and crack distribution features for “Three Soft” coal seam, this paper combines the hydraulic fracturing test of coal seam gas field in Jiaozuo Henan based on the assumption of crack width in PKN model and frictional pressure drop law of fracture flowing. This paper focuses on fluid loss factors of fracturing fluid, finally the crack propagation and permeability calculation model of cataclastic coal under hydraulic fracturing was established, and it verified the result by earthquake measure method and retrieval algorithm. The results show that each crack of Ⅱ1 coal seam has roughly similar geometric feature. Its length is 81.85-139.23m with an average of 100.41m. The maximum width is 24.83-32.78mm with an average of 27.32mm, and the length results accord with the earthquake measurement. Based on the fracture permeation model, the permeability of coal reservoir is about (9.21-86.61)×10-3μm2 with an average of 31.63×10-3μm2. It’s easy to find the results are consistent with the later inversion reservoir permeability. Thus, after fracturing treatment, coal reservoir permeability is significantly improved. Crack propagation and fracture permeability model can be used for guiding fracturing gas extraction and predicating the productivity of the “Three Soft” coal seam.

Key words: “Three Soft&rdquo, coal seam, Hydraulic fracturing, Fracture extending model, Fracture permeation model, Permeability inversion

CLC Number: 

  • TE122

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