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<p>In order to effectively address the negative impact of inadequate hole sealing quality on gas extraction from coal beds and to enhance the efficiency of gas extraction, a novel degradable phase change gel sealing material for dynamic sealing of boreholes was investigated. In order to investigate the swelling and viscosity of gel materials at different ratios, five basic components were selected and utilized in physical experiments, as well as response surface method analysis. The components comprised sodium carboxymethyl cellulose (CMC), sodium methyl ester sulfonate of fatty acids (MES), polyacrylamide (PAM), calcium oxide-calcium sulfate composite swollen agent (HCSA), and gelatin. The findings of the study indicated that the interaction between CMC and water-to-solid ratio exerted the most significant influence on the viscosity and swelling rate of degradable phase change gel materials. The determination of the optimal ratio was achieved through the implementation of Design Expert software, a program designed for the optimization of ratios. The findings indicate that the phase change gel sealing material comprising 20.0% of MES, 21.0% of CMC, 0.8% of PAM, 10% of gelatin, 48.2% of composite swelling agent, and a water-to-solid ratio of 4.9:1 exhibits optimal physical properties, with a swelling rate of 15.30% and a viscosity of 1702.00 mPa·s. The degradation experiments were conducted under conditions of airtightness, humidity, and darkness. The findings indicated that the degradable phase change (i.e., rheological sol-gel transition) gel material exhibited optimal viscosity and swelling rate. Degradation experiments were conducted, and the degradation rate of the degradable phase change gel material was determined to be 1.28 milliliters per day, with a degradation rate of 73%. The micro characteristics of the material were observed using a JSM-7610&#xa0;F scanning electron microscope, revealing its effective permeability and capacity for sealing microscopic cracks. In a field experiment conducted in a coal mine in Shanxi Province, China, the gas extraction concentration of the extraction borehole sealed with biodegradable phase-change gel sealing material was maintained at approximately 41.8% after three months of extraction. The phase-change gel material, prepared in this ratio, played a pivotal role in sealing the borehole, while also achieving the recovery of the extraction pipe. The findings of the research provide a valuable reference point for the efficient and environmentally-friendly extraction of the substance in question.</p>

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Novel degradable rheological phase-change gel sealing material for dynamic sealing technology in gas extraction boreholes

  • 期刊论文

  • 发表日期：

    2026年4月16日

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  • Chenye Duan,
  • Chao Zhang,
  • Ruoyu Bao,
  • Ming Cheng,
  • Biao Hu,
  • Renhui Cheng

摘要

In order to effectively address the negative impact of inadequate hole sealing quality on gas extraction from coal beds and to enhance the efficiency of gas extraction, a novel degradable phase change gel sealing material for dynamic sealing of boreholes was investigated. In order to investigate the swelling and viscosity of gel materials at different ratios, five basic components were selected and utilized in physical experiments, as well as response surface method analysis. The components comprised sodium carboxymethyl cellulose (CMC), sodium methyl ester sulfonate of fatty acids (MES), polyacrylamide (PAM), calcium oxide-calcium sulfate composite swollen agent (HCSA), and gelatin. The findings of the study indicated that the interaction between CMC and water-to-solid ratio exerted the most significant influence on the viscosity and swelling rate of degradable phase change gel materials. The determination of the optimal ratio was achieved through the implementation of Design Expert software, a program designed for the optimization of ratios. The findings indicate that the phase change gel sealing material comprising 20.0% of MES, 21.0% of CMC, 0.8% of PAM, 10% of gelatin, 48.2% of composite swelling agent, and a water-to-solid ratio of 4.9:1 exhibits optimal physical properties, with a swelling rate of 15.30% and a viscosity of 1702.00 mPa·s. The degradation experiments were conducted under conditions of airtightness, humidity, and darkness. The findings indicated that the degradable phase change (i.e., rheological sol-gel transition) gel material exhibited optimal viscosity and swelling rate. Degradation experiments were conducted, and the degradation rate of the degradable phase change gel material was determined to be 1.28 milliliters per day, with a degradation rate of 73%. The micro characteristics of the material were observed using a JSM-7610 F scanning electron microscope, revealing its effective permeability and capacity for sealing microscopic cracks. In a field experiment conducted in a coal mine in Shanxi Province, China, the gas extraction concentration of the extraction borehole sealed with biodegradable phase-change gel sealing material was maintained at approximately 41.8% after three months of extraction. The phase-change gel material, prepared in this ratio, played a pivotal role in sealing the borehole, while also achieving the recovery of the extraction pipe. The findings of the research provide a valuable reference point for the efficient and environmentally-friendly extraction of the substance in question.