中国安全科学学报 ›› 2017, Vol. 27 ›› Issue (9): 122-128.doi: 10.16265/j.cnki.issn1003-3033.2017.09.021

• 安全工程技术科学 • 上一篇    下一篇

注气压力对不同注源气体置驱效应的影响

杨宏民1,2 教授, 梁龙辉1, 冯朝阳1, 许东亮1   

  1. 1 河南理工大学 安全科学与工程学院,河南 焦作 454003
    2 煤矿灾害预防与抢险救灾教育部工程研究中心,河南 焦作 454003
  • 收稿日期:2017-05-28 修回日期:2017-08-05 出版日期:2017-09-20 发布日期:2020-11-16
  • 作者简介:杨宏民 (1967—),男,陕西铜川人,教授级高工,博士生导师,从事煤矿瓦斯防治技术及装备的科研和教学工作。E-mail:yhmfs@163.com。
  • 基金资助:
    国家自然科学基金资助(51174081);河南省高校科技创新团队支持计划(17IRTSTHN030);教育部创新团队发展支持计划(IRT_16R22)。

Study on influence of injection pressure on replacement effect for different injection gases

YANG Hongmin1,2, LIANG Longhui1, FENG Zhaoyang1, XU Dongliang1   

  1. 1 School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo Henan 454003, China
    2 Engineering Research Center of Mine Disaster Prevention and Rescue, Ministry of Education, Jiaozuo Henan 454003, China
  • Received:2017-05-28 Revised:2017-08-05 Online:2017-09-20 Published:2020-11-16

摘要: 注气压力是煤层注气促排瓦斯工程技术的关键技术参数。为了研究注气压力对不同注源气体置驱煤中CH4效应的影响,采用含瓦斯颗粒煤垂直应力载荷条件下向实验室注气模拟试验方法,开展1.25 MPa垂直载荷条件下无烟煤注入He、N2和CO2等气体置驱煤中CH4的模拟试验。结果表明:在突破时间内注源气体全部滞留在煤层内;超过突破时间后,注源气体逐步从出口流出,其滞留率逐渐减小,最终只显现驱替作用。注源气体的突破时间随注气压力的增加而减少,随注源气体吸附性由强到弱而减少。置驱率由置换作用和驱替作用及其配比关系共同决定,其与注源气体吸附性强弱没有明显的关系,且注气压力越高置驱效率越高。

关键词: 注气压力, 置驱作用, 突破时间, 滞留率, 置驱率, 无烟煤

Abstract: The gas injection pressure is the key technical parameter in the field of enhanced coalbed methane drainage engineering by gas injection. In order to study the effect of injection pressure on replacement effect for coal seam methane in different source gas injection, a laboratory gas injection simulation test method was adopted under the condition of vertical stress loading on coal particles containing methane, and a series of simulation experiments on replacement and driving methane in anthracite coal was carried out by use of helium, nitrogen and carbon dioxide injection under 1.25 MPa vertical load. Experimental results show that all the source gases are detained in the coal seam during the breakthrough time, and the breakthrough time of CO2 can be as long as 440 min, that after the breakthrough, the injection source gases run out from exit gradually, and the retention rate decreases gradually, and only shows driving effect ultimately, that the breakthrough time of the injection source gases decreases with the increase of the gas injection pressure, and decreases with the increase of the source gas adsorption, and that the rate of replacement-driving is determined by the replacement action, driving action and its ratio, and it has no obvious relationship with the adsorption of the injection source gas, and the higher the injection pressure, the higher the efficiency.

Key words: gas pressure, replacement-driving action, breakthrough time, retention rate, replacement rate, anthracite

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