注气驱替煤层瓦斯时效特性影响因素分析

采矿与安全工程学报 ›› 2013, Vol. 30 ›› Issue (2): 273-277.

注气驱替煤层瓦斯时效特性影响因素分析

1．河南理工大学安全科学与工程学院，河南省瓦斯地质与瓦斯治理重点实验室—省部共建国家重点实验室培育基地，河南焦作 454003；2．平顶山天安煤业股份有限公司八矿，河南平顶山 467012

收稿日期:2012-05-14 出版日期:2013-03-15 发布日期:2013-02-24
作者简介:杨宏民(1967-)，男，陕西省铜川市人，教授级高级工程师，博士，从事矿井瓦斯防治技术及装备方面的研究。 E-mail：yhmfs@163.com Tel：0391-3987439
基金资助:
国家自然科学基金项目(5097056，51174081)

Influencing factors on time-varying characteristics of displacement coalbed methane by gas injection

Received:2012-05-14 Online:2013-03-15 Published:2013-02-24

摘要/Abstract

摘要： 为了分析注气驱替煤层瓦斯时效特性的影响因素，建立了注N2驱替煤层瓦斯的数学模型，采用COMSOL Multiphysics软件模拟了注气压力、抽采负压和注气时间对注气驱替煤层瓦斯时效特性的影响，研究了不同条件下煤层瓦斯含量和消突周期的变化规律，结果表明：注气压力越大，瓦斯含量下降越快，消突周期越短，合理的注气压力为0.5 MPa；抽采负压对其时效特性的影响不大，合理的抽采负压为5~13 kPa；煤层瓦斯含量随着注气时间的增加逐渐下降，注气孔附近为注气驱替煤层瓦斯的薄弱区域。在石港公司进行注气驱替煤层瓦斯现场试验，通过与数值模拟结果的对比得出：在相同的条件下，实测的瓦斯含量总是略小于模拟结果，并对造成这种差异性的原因进行了分析。

关键词: 注气, 时效特性, 影响因素, 数值模拟, 注气压力, 抽采负压

Abstract: In this paper, to analyze the influencing factors on time-varying characteristics of displacement coalbed methane by gas injection, the mathematical model of displacement coalbed methane technology by N2 injection was established, and the effects of the influencing factors, such as gas injection pressure, drainage negative pressure, gas injection time, et al, on the time-varying characteristics of displacement coalbed methane by gas injection have been simulated by using COMSOL multiphysics software, then the variation laws of the methane content and outburst elimination cycle under different conditions were studied. The results show that the greater the gas injection pressure is, the faster the methane content decreases, and the shorter the outburst elimination cycle is, while the reasonable gas injection pressure is 0.5 MPa. In addition, the influence of drainage negative pressure on the time-varying characteristics is not obvious, and the reasonable drainage negative pressure is 5-13 KPa. Moreover, the methane content decreases gradually with the increase of injection time, while the position near the gas injection borehole is the weak area in the displacement coalbed methane technology by gas injection. Furthermore, the field tests were carried out in Shigang Company. By comparing with the numerical results, the measured methane contents are always slightly smaller than that in simu-lation results under the same conditions. The reasons for this difference were also analyzed.

Key words: gas injection, time-varying characteristics, influencing factors, numerical simulation, gas injection pressure, drainage negative pressure

杨宏民, 夏会辉, 王兆丰. 注气驱替煤层瓦斯时效特性影响因素分析[J]. 采矿与安全工程学报, 2013, 30(2): 273-277.

YANG Hong-Min, XIA Hui-Hui, WANG Zhao-Feng. Influencing factors on time-varying characteristics of displacement coalbed methane by gas injection[J]. Journal of Mining & Safety Engineering, 2013, 30(2): 273-277.

[1]	潘卫东，姜鹏，许延春，李江华. 薄基岩近距离煤层开采“水-岩”致灾演变模型及规律研究[J]. 采矿与安全工程学报, 2020, 37(3): 543-552.
[2]	蒋威，鞠文君，汪占领，张镇. 厚硬基本顶综放沿空巷道受载变形机制研究[J]. 采矿与安全工程学报, 2020, 37(2): 319-326.
[3]	谭云亮，范德源，刘学生，李先锋，马庆，王洪磊，范文昌. 煤矿超大断面硐室判别方法及其工程特征[J]. 采矿与安全工程学报, 2020, 37(1): 23-31.
[4]	郭广礼，郭凯凯，张国建，李怀展，胡绍豪. 深部带状充填开采复合承载体变形特征研究[J]. 采矿与安全工程学报, 2020, 37(1): 101-109.
[5]	张悦刊，曹井振，刘培坤，李晓宇，杨兴华，王辉. 具有W型反射盘的新型干扰床分级机性能分析[J]. 采矿与安全工程学报, 2020, 37(1): 207-214.
[6]	吕可，王金安，李鹏波. 冲击地压巷道周边动力放大效应及支护参数调控策略[J]. 采矿与安全工程学报, 2019, 36(6): 1168-1177.
[7]	宋卫华，邸春雷，闫万俊，邓兆睿. 大断面矩形巷道过陷落柱构造带支护技术[J]. 采矿与安全工程学报, 2019, 36(6): 1178-1185.
[8]	贾林刚，张华兴. 长壁充填开采充填体稳定性研究[J]. 采矿与安全工程学报, 2019, 36(6): 1234-1239.
[9]	曹帅，薛改利，宋卫东,. 组合胶结充填体力学特性试验与应用研究[J]. 采矿与安全工程学报, 2019, 36(3): 601-608.
[10]	汪伟，罗周全，秦亚光，向军. 深孔落矿破顶层厚度综合确定方法及应用[J]. 采矿与安全工程学报, 2019, 36(1): 65-71.
[11]	郭玉，郑西贵，郭罡业，赵启峰，周伟，安铁梁. 近距离跨采软岩巷道围岩变形破坏控制研究[J]. 采矿与安全工程学报, 2018, 35(6): 1142-1149.
[12]	刘志刚，曹安业，井广成. 煤体卸压爆破参数正交试验优化设计研究[J]. 采矿与安全工程学报, 2018, 35(5): 931-939.
[13]	王志强，王朋飞，仲启尧，赵景礼. 极近距煤层(群)间夹矸层处理与利用[J]. 采矿与安全工程学报, 2018, 35(5): 960-969.
[14]	朱立凯，杨天鸿，徐涛，赵国会，谢正红. 煤与瓦斯突出过程中地应力、瓦斯压力作用机理探讨[J]. 采矿与安全工程学报, 2018, 35(5): 1038-1044.
[15]	程详，赵光明，李英明，孟祥瑞，董春亮，许文松. 软岩保护层开采卸压增透效应及瓦斯抽采技术研究[J]. 采矿与安全工程学报, 2018, 35(5): 1045-1053.