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Experimental Evaluation of Liquid Nitrogen Fracturing on the Coal Rocks in Karaganda Basin, Kazakhstan

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Abstract

This work examined the efficacy of liquid nitrogen (LN2) both in coal fracturing, focusing on two different processes: freezing time (FT) and freezing–thawing cycle (FTC), for both dry and water-saturated specimens. Uniaxial compressive strength (UCS) with acoustic emission measurements, hardness, and modulus measurements by nanoindentation, and scanning electron microscope (SEM) imaging were conducted to comparatively analyze the cryogenic treatment efficacy of coal rocks. The outcomes indicated that in all freezing–thawing processes, water-saturated specimens have lower UCS values compared to dry ones. On the other hand, in freezing time process, water-saturated experiments have larger UCS values compared to dry ones. Moreover, it is noticed that FT experiments have greater UCS values than FTC experiments in both dry and water-saturated experiments. The hardness and reduced modulus change augment for both water-saturated and dry specimens, but in water-saturated ones, there is a sharp upward trend indicating that hardness decreases more as LN2 treatment increases. From SEM observation, it is noticed that new fractures were created, and sections of preexisting crevices expand creating fracture networks. Due to the frost force resulting from LN2 treatment, the consolidation forces among coal particles are compromised, thus creating new fractures.

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Acknowledgements

This research is financially supported by Nazarbayev University (Funder Project Reference: 021220CRP2022).

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Authors and Affiliations

  1. School of Mining and Geosciences, Department of Petroleum Engineering, Nazarbayev University, 010000, Astana, Kazakhstan

    Sotirios Nik. Longinos & Randy Hazlett

  2. School of Engineering and Digital Sciences, Department of Civil and Environmental Engineering, Nazarbayev University, 010000, Astana, Kazakhstan

    Alina Serik & Dichuan Zhang

  3. College of Energy, State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, 610059, China

    Lei Wang

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  1. Sotirios Nik. Longinos
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  2. Alina Serik
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Correspondence to Sotirios Nik. Longinos.

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Longinos, S.N., Serik, A., Zhang, D. et al. Experimental Evaluation of Liquid Nitrogen Fracturing on the Coal Rocks in Karaganda Basin, Kazakhstan. Arab J Sci Eng 48, 16623–16638 (2023). https://doi.org/10.1007/s13369-023-07857-y

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  • DOI: https://doi.org/10.1007/s13369-023-07857-y

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