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WANG Shengwei，XIONG Zhangkai，LYU Shuaifeng，et al. Characteristics and significance of proppant in hydraulic fractures in coal reservoirs[J]. Coal Geology & Exploration，2022，50(3)：137−145. DOI: 10.12363/issn.1001-1986.21.12.0813
Citation: WANG Shengwei，XIONG Zhangkai，LYU Shuaifeng，et al. Characteristics and significance of proppant in hydraulic fractures in coal reservoirs[J]. Coal Geology & Exploration，2022，50(3)：137−145. DOI: 10.12363/issn.1001-1986.21.12.0813
shu

Characteristics and significance of proppant in hydraulic fractures in coal reservoirs

  • 1.

    College of Earth Resources, China University of Geosciences(Wuhan), Wuhan 430074, China

  • 2.

    State Key Laboratory of Coal and CBM Co-mining, Jincheng 048012, China

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  • Received Date: December 14, 2021
  • Revised Date: February 28, 2022
  • Available Online: March 23, 2022
  • Published Date: March 24, 2022
    Graphical Abstract
    • Abstract
  • The distribution form and internal characteristics of proppant after coal seam hydraulic fracturing determine the fracturing effect to a great extent. The proppant in the hydraulic fracture exposed in the underground roadways of the coal mine is taken as the research object. The morphology and accumulation characteristics of the proppant were observed, and the relationship between the morphology and accumulation characteristics of the proppant and its stacking process was analyzed. Then, the morphology and accumulation characteristics of the proppant obtained at the typical part of the hydraulic fracture are described, which provides a basis that restores the stacking process of the proppant. The results of this study indicate that the proppant size gradually becomes smaller with the increase of the distance from the wellbore in the horizontal fracture. In the soft coal zone, the proppant particles experience a strong collision in chaotic hydrodynamic circumstances before deposition, and the sand spreading characteristics of the proppant zone, mixed zone of proppant and pulverized coal, and coal pulverized zone are formed. The change of fracture extension form can lead to the early deposition of proppant, which is not conducive to fracture extension. The sorting and integrity of proppant particles, the adhesion of pulverized coal and the trace in coal rock are often different in different fractures, which is of guiding significance to the proppant accumulation process and the flow characteristics of fracturing fluid. The results can provide a scientific basis for the parameter of numerical simulation and engineering practice. And it has certain reference significance for the same type of fracturing design and fracturing effect prediction.
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