CO2相变致裂煤的纳米孔隙尺度改造效应

doi:10.13722/j.cnki.jrme.2022.0408

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摘要为探讨不同CO2相变致裂压力对纳米孔隙的尺度改造效应及其对瓦斯(煤层气)运移的影响，开展120，150，185 MPa作用下的CO2相变致裂煤体实验，综合采用高压压汞、低温液氮吸附、低温CO2吸附孔隙结构参数测试方法，分析CO2相变致裂后煤的大孔(＞50 nm)–介孔(2～50 nm)–微孔(＜2 nm)结构演化特征。结果表明：CO2相变致裂对大孔和介孔具有扩孔效应；致裂后，大孔平均孔径与孔容大幅度增大，孔表面积降低；介孔平均孔径增大，孔表面积明显降低；孔隙连通性明显增强。CO2相变致裂过程时间极短，高压气体优先选择裂隙和大尺度孔隙进行扩展，延伸至微孔时，衰减的压力不足以改造具有化学性质的微孔。CO2相变致裂在大孔–介孔尺度的扩孔效应，随致裂压力的增大而增强；不同变质、变形程度煤的大孔–介孔–微孔发育存在差异；因此，研发“高致裂压力–长作用时效–大能量”的CO2相变致裂器，有助于进一步增强CO2相变致裂的扩孔效应、改善纳米尺度瓦斯运移通道、提高瓦斯抽采效率。研究成果为CO2相变致裂技术优化和改进提供了科学依据。

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	张震1
	刘高峰1
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	李宝林1
	刘欢1
	司念1
	关文博1

关键词 ：矿井瓦斯, CO2相变致裂, 孔隙结构, 致裂压力, 尺度效应

Abstract：To investigate the transformed effect of nano-pores structure and its control on gas transport in coal under different pressures of CO2 phase transition fracturing(CO2-PTF)，the experiments of coal induced with CO2-PTF were carried out under the fracturing pressures of 120，150 and 185 MPa. The structure evolution characteristics of macro-pores(＞50 nm)，meso-pores(2–50 nm) and micro-pores(＜2 nm) were analyzed by the comprehensive measurements of high-pressure mercury injection，low-temperature liquid nitrogen adsorption and low-temperature CO2 adsorption. The results show that CO2-PTF has pore-enlarging effect for macro-pores and meso-pores. The average pore size and pore volume of macro-pores increase significantly，while the pore surface area decreases. The average pore size of meso-pores increases，while the pore surface area decreases obviously. The pore connectivity improves greatly. It is hard to transform the micro-pores with chemical properties by the declined fracturing pressure of CO2-PTF due to the fracturing pressure expanding preferentially from fractures and large-scale pores in the short duration. The pore enlarging effect of CO2-PTF for macro-pores and meso-pores enhanced with the fracturing pressure. The distribution of macro-pores，meso-pores and micro-pores is obvious differences in coals with different metamorphic and deformation degrees. Therefore，the research of “high fracturing pressure-long action duration - high energy” CO2-PTF device will contribute to further enhance the pore enlarging effect，improve the gas transport channel with nano-scale and promote the gas drainage efficiency. The research results provide a scientific basis for the optimization and improvement of CO2-PTF technology.

Key words： coalmine gas CO2 phase transition fracturing pore structure fracturing pressure scale effect

引用本文:

张震1，刘高峰1，2，3，李宝林1，刘欢1，司念1，关文博1. CO2相变致裂煤的纳米孔隙尺度改造效应[J]. 岩石力学与工程学报, 2023, 42(3): 672-684.
ZHANG Zhen1，LIU Gaofeng1，2，3，LI Baolin1，LIU Huan1，SI Nian1，GUAN Wenbo1. Transformed effect of nano-pores in coal by CO2 phase transition fracturing. , 2023, 42(3): 672-684.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0408 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/I3/672

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