[1]李志强,唐旭.水射流卸压增渗及抽采瓦斯效果的渗流力学数值解[J].西安科技大学学报,2012,(04):464-469.
 LI Zhi-qiang,TANG Xu.Stress relief and permeability increasing by water jet and numerical method of seepage mechanics equation for gas extraction effect[J].Journal of Xi'an University of Science and Technology,2012,(04):464-469.
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水射流卸压增渗及抽采瓦斯效果的渗流力学数值解(/HTML)
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西安科技大学学报[ISSN:1672-9315/CN:61-1434/N]

卷:
期数:
2012年04期
页码:
464-469
栏目:
出版日期:
2012-08-31

文章信息/Info

Title:
Stress relief and permeability increasing by water jet and numerical method of seepage mechanics equation for gas extraction effect
文章编号:
1672-9315(2012)04-0464-06
作者:
李志强唐旭
河南理工大学 河南省瓦斯地质与瓦斯治理重点实验室,河南 焦作 454000
Author(s):
LI Zhi-qiangTANG Xu
State Key Laboratory Cultivation Base for Gas Geology and Gas Control,Henan Polytechnic University,Jiaozuo 454000,China
关键词:
瓦斯 水射流 抽采 孔隙结构 渗流
Keywords:
gas water jet gas extraction pore structure seepage
分类号:
TD 713.2
文献标志码:
A
摘要:
为提高低渗煤体的瓦斯抽采性能,以重庆天府三矿为研究目标区,采用低温液氮吸附法和压汞法测定了煤层孔隙结构,分析了重庆天府矿区煤体低渗的原因,结果表明,煤体孔隙多为两端开口的平板状、管状孔,孔隙的连通性好,压汞渗透率是原位煤体渗透率的2×105倍,煤体孔隙本身的渗透性较好,煤层低渗为高地应力所致。进行了底板穿层钻孔高压水射流卸压增渗试验,试验表明,卸压后煤层渗透率增加了90倍,抽采率从17%提高到了58%,抽采量增加了4.8倍。建立了瓦斯抽采的渗流力学方程,解算了卸压增渗透前后
Abstract:
In order to improve gas extraction capability of low permeability coal seam of Tianfu mine in Chongqing,the paper showed the pore structure of coal seam measured by low temperature nitrogen adsorption method and mercury intrusion method and analysed the reason why coal seam in Tianfu,was low permeable.The results show that most pores,in plate type of two open-ends and tube type,were usually of good connectivity.Further,the permeability measured by mercury intrusion method is 2×105 times than that by field test.Even though the permeability of coal itself was good,the low permeability of coal seam resulted from higher ground stress.So pressure relief and permeability increasing technology by water jet through the cross-drilling from the bottom was carried out.The results indicate that the permeability of coal seam increased by 90 times,the gas extraction from 17% to 58%,and the quantity of gas extraction by 4.8 times after stress relief.Based on the data by field test,the seepage mechanics equation was established and the gas extraction radius of drilling at different extraction time was calculated.The distance of drillings and gas extraction time was improved rationally.Hence,it provides the theory guidance for evaluation of stress relief and permeability increasing technology by water jet.

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备注/Memo

备注/Memo:
收稿日期: 2012-03-28
基金项目: 国家自然科学基金青年基金项目(51004041); 国家自然科学基金项目(41172141)
通讯作者: 李志强(1975-),男,山西阳泉人,博士,主要从事煤层气开发及矿井瓦斯防治理论及技术研究.
更新日期/Last Update: 1900-01-01