声场作用下煤储层渗透性试验研究

发布时间：2018-04-25 13:51

本文选题：煤层气 + 有效应力　；参考：《煤炭学报》2017年S1期

【摘要】：利用自主研发的声场作用下煤层气渗流实验系统,实验研究了声场对煤储层渗流特性的影响。实验得出:不加声场下,煤体的渗透率随有效应力比、有效体应力的增加呈先减小后增大的趋势,渗透率初始快速降低,然后趋于平缓,最后增大;有效应力比恒定时,煤体的渗透率随有效体应力的增大而减小,最后趋于平缓;声场作用下煤体的渗透率大于无声场下,渗透率随声场作用时间的增加呈先增大后趋于稳定的趋势,且渗透率随声强的增加而增大,声场作用前后渗透率之比与声强呈线性关系;相同条件下,声场能促进煤层气扩散、运移,离震源越近,声场提高煤层渗透率效果越明显,因声波在煤层中传播发生衰减,声能降低,煤层气流量增量与距震源距离呈负指数关系。
[Abstract]:The effect of sound field on the seepage characteristics of coal reservoir is studied by the experimental system of coal bed gas seepage under the sound field of independent research and development. The experiment shows that the permeability of coal body decreases first and then increases with the increase of effective stress, and the permeability rate decreases rapidly, then tends to slow and finally increases under the sound field without the sound field. When the effective stress ratio is constant, the permeability of the coal body decreases with the increase of the effective body stress, and finally tends to be gentle. The permeability of coal body is larger than that under the sound field under the action of sound field, and the permeability increases with the increase of sound field and then tends to stabilize, and the permeability increases with the increase of sound intensity, and the permeability before and after the sound field action. There is a linear relationship with the sound intensity. Under the same conditions, the sound field can promote the diffusion and migration of coal bed gas. The nearer to the source, the more obvious the effect of the sound field to improve the permeability of the coal seam, the attenuation of sound wave in the coal seam, the decrease of sound energy, the negative exponential relationship between the increment of the coalbed gas flow and the distance from the distance from the source.

【作者单位】：重庆大学煤矿灾害动力学与控制国家重点实验室;
【基金】：国家自然科学基金面上资助项目(51574049) 国家重点基础研究发展计划(973)资助项目(2014CB239204) 中央高校基本科研业务费专项资助项目(106112017CDJPT240001)
【分类号】：TD712

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