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<p>To investigate the inhibition effect of water injection on coal gas desorption, an experimental study was carried out using an independently constructed experimental system with water injection and gas pressure as variables. Laboratory data showed that eliminating high-pressure damage to the original structure of coal body, isobaric uniform injection of a single water had a significant inhibitory effect on gas desorption of coal body, with the degree of inhibition ranging 2.41–27.12%, showing a significant water lock effect. The gas pressure increased, the inhibition effect of water injection on gas desorption was attenuated, and the decay ratio of gas desorption was reduced from 27.12 to 3.72%. The increase in gas pressure can promote gas desorption and the gas desorption capacity increased by 9.26–90.81%. The field data showed that the gas desorption capacity was obviously reduced after water injection, and the decrease range was 6.86–37.57%, and the on-site injection of water had a better blocking effect.</p>

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Mechanism of Isobaric Water Injection to Inhibit Gas Desorption in Coal Bodies: Laboratory and Field Tests

  • 期刊论文

  • 发表日期：

    2025年5月29日

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  • Zhenfei Li,
  • Chengwu Li,
  • Chengmin Wei,
  • Yifan Yin,
  • Mingjie Li,
  • Peixuan Zhang

摘要

To investigate the inhibition effect of water injection on coal gas desorption, an experimental study was carried out using an independently constructed experimental system with water injection and gas pressure as variables. Laboratory data showed that eliminating high-pressure damage to the original structure of coal body, isobaric uniform injection of a single water had a significant inhibitory effect on gas desorption of coal body, with the degree of inhibition ranging 2.41–27.12%, showing a significant water lock effect. The gas pressure increased, the inhibition effect of water injection on gas desorption was attenuated, and the decay ratio of gas desorption was reduced from 27.12 to 3.72%. The increase in gas pressure can promote gas desorption and the gas desorption capacity increased by 9.26–90.81%. The field data showed that the gas desorption capacity was obviously reduced after water injection, and the decrease range was 6.86–37.57%, and the on-site injection of water had a better blocking effect.