检索结果-南通市图书馆

Coal Seam permeability improvement and CBM Production Enhancement by Enlarged Borehole: Mechanism and Application

Energy Engineering 2021年第6期118卷 1811-1825页

作者： Xiyuan Li Peng Chu Zhuang Lu Yuanyuan Liu Zibin Zhu Jin Gao Xiaoxue Liao Tao Yang China Pingmei Shenma Group State Key Laboratory Coking Coal Exploitat&ComprehensPingdingshan467000China Key Laboratory of Coal Methane and Fire Control Ministry of EducationChina University of Mining&TechnologyXuzhou221116China National Engineering Research Center for Coal Gas Control China University of Mining&TechnologyXuzhou221116China

The permeability is a key factor to determine the efficiency of coalbed methane(CBM)*** borehole enlargement technology using hydraulic and mechanical measures to cut coal is an effective method to increase the coal seam permeability and improve the efficiency of gas *** design of the layout of boreholes is the prerequisite for efficient and economical gas *** this paper,based on the strain-softening model,the stress and permeability model of the coal seam around the enlarged borehole was built,and based on the dual-medium model,the gas migration model in the coal seam was *** the borehole enlargement gas drainage engineering of E9/10 coal seam in Pingdingshan No.8 coal mine was simulated by using COMSOL Multiphysics *** distribution of stress and permeability in the coal seam around a borehole was analyzed,and the reasonable borehole radius of 0.25 m and reasonable borehole spacing of 6 m were ***,in Pingdingshan No.8 coal mine,field application was carried out in E9/10 coal seam-21070 working face from the high-level gas drainage *** results show that the actual average coal slag discharge rate is 77.82%,which achieved borehole *** natural gas flow rate from an enlarged borehole is 2.3–7.3 times that of a normal borehole,and the influence range of enlarged boreholes is more than 6 *** average gas drainage concentration of a group of enlarged boreholes is about 42%,and the average gas drainage amount is about 0.53 m3/*** two months of gas extraction,the outburst risk in this area was eliminated,which provides a guarantee for safe coal mining.

关键词： CBM production gas extraction enlarged borehole permeability improvement numerical simulation field application

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Pulsating hydraulic fracturing technology in low permeability coal seams

引用

International Journal of Mining Science and Technology 2015年第4期25卷 681-685页

作者： Wang Wenchao Li Xianzhong Lin Baiquan Zhai Cheng School of Civil Engineering Tianjin University School of Energy Science and Engineering Henan Polytechnic University School of Safety Engineering China University of Mining and Technology

Based on the difficult situation of gas drainage in a single coal bed of high gas content and low perme- ability, we investigate the technology of pulsating hydraulic pressure relief, the process of crank plunger movement and the mechanism of pulsating pressure formation using theoretical research, mathematical modeling and field testing. We analyze the effect of pulsating pressure on the formation and growth of fractures in coal by using the pulsating hydraulic theory in hydraulics. The research results show that the amplitude of fluctuating pressure tends to increase in the case where the exit is blocked, caused by pulsating pressure reflection and frictional resistance superposition, and it contributes to the growth of fractures in coal. The crack initiation pressure of pulsating hydraulic fracturing is 8 MPa, which is half than that of normal hydraulic fracturing; the pulsating hydraulic fracturing influence radius reaches 8 m. The total amount of gas extraction is increased by 3.6 times, and reaches 50 LJmin at the highest point. The extraction flow increases greatly, and is 4 times larger than that of drilling without fracturing and 1.2 times larger than that of normal hydraulic fracturing. The technology provides a technical measure for gas drainage of high gas content and low permeability in the single coal bed.

关键词： Gas drainage Pulsating hydraulic fracturing Fatigue damage permeability improvement

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：