Scholarlink

<p>Using water-saturated specimens, the study assessed the effectiveness of liquid nitrogen (LN<sub>2</sub>) in two distinct coal fracturing techniques: freezing time (FT) and freezing–thawing cycle (FTC). Tensile (dog bone) and uniaxial compressive strength (UCS) tests were used to evaluate the efficacy of cryogenic treatment on coal rocks. The UCS and dog bone test results showed that FTC experiments performed better than FT experiments. This implies that more considerable permeability improvements could be obtained by multiple LN<sub>2</sub> injections in real-world LN<sub>2</sub> fracturing applications. Furthermore, von Mises stress analysis followed changes over time in numerical simulations to examine the stress distribution patterns in coal samples undergoing cryogenic treatment. The remarkable correlation between the simulation findings and experimental data confirmed the model’s accuracy, particularly during peak stress periods. The viability of using LN<sub>2</sub>-based treatments to increase coal bed permeability is strongly supported by these results, which have substantial ramifications for raising the effectiveness and security of coal extraction procedures.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Experimental and Numerical Investigation of Cryogenic Fracturing in Coal Rocks Using Compression and Dog-Bone Testing Methods

  • 期刊论文

  • 发表日期：

    2025年8月2日

查看全文
  • Sotirios Nik. Longinos,
  • Dastan Begaliyev,
  • Margrette James,
  • Alisher Konysbekov

摘要

Using water-saturated specimens, the study assessed the effectiveness of liquid nitrogen (LN2) in two distinct coal fracturing techniques: freezing time (FT) and freezing–thawing cycle (FTC). Tensile (dog bone) and uniaxial compressive strength (UCS) tests were used to evaluate the efficacy of cryogenic treatment on coal rocks. The UCS and dog bone test results showed that FTC experiments performed better than FT experiments. This implies that more considerable permeability improvements could be obtained by multiple LN2 injections in real-world LN2 fracturing applications. Furthermore, von Mises stress analysis followed changes over time in numerical simulations to examine the stress distribution patterns in coal samples undergoing cryogenic treatment. The remarkable correlation between the simulation findings and experimental data confirmed the model’s accuracy, particularly during peak stress periods. The viability of using LN2-based treatments to increase coal bed permeability is strongly supported by these results, which have substantial ramifications for raising the effectiveness and security of coal extraction procedures.