非常规天然气

超声作用下煤岩细观损伤演化模型及增渗机理研究

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  • 1.辽宁工程技术大学力学与工程学院,辽宁 阜新  123000;2.东南大学工程力学系,江苏 南京  210069;
    3.北京市市政工程研究院,北京 100190
肖晓春(1979-),男,内蒙古化德人,教授,博士,硕士生导师,主要从事煤矿瓦斯突出机理及预测技术、煤层气增采机理及新技术研究.E-mail:xxc7902@163.com.

收稿日期: 2015-03-11

  修回日期: 2015-07-14

  网络出版日期: 2016-01-10

基金资助

国家自然科学基金面上项目(编号:51374123);国家自然科学基金青年基金项目(编号:51004061); 2014年辽宁省优秀人才支持计划(编号:LJQ2014043)联合资助.

Coal rock microscopic damage evolution model and permeability increase mechanism research under ultrasound

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  • 1.School of Mechanics and Engineering, Liaoning Technical University, Fuxin 123000, China;
    2.Department of Engineering Mechanics, Southeast University, Nanjing 210069, China;
    3.Beijing Muntcipal Engineering Research Insatute, Beijing 100190, China

Received date: 2015-03-11

  Revised date: 2015-07-14

  Online published: 2016-01-10

摘要

渗透率是指在一定压差下,多孔介质材料允许流体通过的能力,是描述多孔介质渗透性的重要物理参数。依据连续介质力学和唯象理论,在细观尺度上考虑了超声二次损伤对颗粒煤岩渗透率的重要影响,建立了超声激励过程中机械及热效应导致的有效应力和损伤量的理论模型。开展了不同气体压力下颗粒煤岩渗透率测定试验,拟合得到了渗透率与气体压力之间的经验公式,建立了煤岩气测渗透率、有效应力和二次损伤量间的关系模型。结果表明:超声作用能够有效提高颗粒煤岩体系的渗透率,有效应力的逐渐增大是超声增渗的主要原因;接触颗粒面元间损伤的增加和显著的热效应是渗透率增长率下降的主要影响因素。研究工作对煤层气增渗机理及优化开采具有重要的科学意义和工程实用价值。

本文引用格式

肖晓春,丁鑫,徐军,潘一山,吴迪,吕祥锋 . 超声作用下煤岩细观损伤演化模型及增渗机理研究[J]. 天然气地球科学, 2016 , 27(1) : 166 -172 . DOI: 10.11764/j.issn.1672-1926.2016.01.0166

Abstract

Permeability refers to that under certain pressure difference,material allows fluid through porous media.It is an important physical parameter to describe porous media permeability.Based on the continuum mechanics and phenomenological theory,the theoretical model of effective stress and damage caused by mechanical and thermal ultrasonic irradiating effects was established,considering the significant influence of secondary damage of ultrasound on granular coal and rock permeability in meso-scale.The permeability of granular coal rock under different gas pressure experiment was carried out,the empirical formula between permeability and gas pressure was fitted,and the relational model of gas permeability,effective stress and secondary damage was established.The results show that the ultrasonic effect can effectively improve the permeability of coal and rock particles system,the gradual increase of effective stress is the main reason for the permeability-increase by ultrasound;the increase of contact particle damage and the significant heating effect is the main influence factor of permeability rate decline.Research work on coal-bed methane permeability-increasing mechanism and optimization of the mining has important scientific significance and practical value in engineering.

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