煤层钻孔密封液径向渗流模型及工程应用

发布时间：2018-06-20 19:24

本文选题：安全工程 + 矿山安全　；参考：《安全与环境学报》2016年06期

【摘要】：针对顺层瓦斯抽采过程中,因钻孔形变较大、封孔长度不足及封孔方法不合理等因素造成抽采钻孔及其周围煤体漏风严重、抽采瓦斯浓度偏低、流量衰减速度较快及稳定性差等技术难题,基于多孔介质渗流理论、流体平衡理论、"固封液-液封气"钻孔密封技术原理,研究了承压密封液在煤层钻孔内的径向渗流规律,建立了不可压缩流体径向驱气稳定渗流物理模型、密封液径向渗流运动数学方程及相关参数计算公式,进而提出了固液耦合壁式密封顺层瓦斯抽采技术。结果表明,采用固液耦合壁式密封技术可对抽采钻孔及周围煤体裂隙实施动态密封,使得瓦斯抽采过程浓度稳定,单孔平均浓度提高4~5倍,平均抽采瓦斯体积分数达到89%以上,显著提高了本煤层瓦斯的抽采效率。
[Abstract]:In the process of gas extraction, the air leakage of the borehole and its surrounding coal body is serious due to the large deformation of borehole, insufficient length of hole sealing and unreasonable sealing method, and the gas concentration is on the low side. Based on the porous media seepage theory, fluid balance theory and the principle of "solid liquid-liquid seal gas" borehole sealing technology, the radial seepage law of confined sealing fluid in coal seam borehole is studied. The physical model of steady seepage of incompressible fluid by radial displacement is established, the mathematical equation of radial seepage movement of sealing fluid and the calculation formula of related parameters are established. Furthermore, the technique of gas extraction in the reservoir with solid-liquid coupled wall seal is put forward. The results show that the dynamic sealing of borehole and surrounding coal fissure can be carried out by using solid-liquid coupled wall sealing technology. The concentration of gas extraction process is stable, the average concentration of single hole is increased by 4 ~ 5 times, and the average volume fraction of gas is more than 89%. The efficiency of gas extraction in this coal seam is improved significantly.
【作者单位】：辽宁工程技术大学安全科学与工程学院;辽宁工程技术大学矿业技术学院;阳煤集团五矿;
【基金】：国家自然科学基金项目(51304112)
【分类号】：TD712.6

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