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| 煤岩应力敏感性的有限元数值模拟 | |
| 引用本文： | 卢渊,伊向艺,杨智,张浩,管保山.煤岩应力敏感性的有限元数值模拟[J].煤田地质与勘探,2011,39(2). |
| 作者姓名： | 卢渊 伊向艺 杨智 张浩 管保山 |
| 作者单位： | 1. 成都理工大学能源学院,四川,成都,610059 2. 成都理工大学能源学院,四川,成都,610059;油气藏地质及开发工程国家重点实验室,四川,成都,610059 3. 中国石油勘探开发科学研究院廊坊分院,河北,廊坊,060507 |
| 基金项目： | 国家科技重大专项课题(2008ZX05037-003) |
| 摘 要： | 利用有限元软件对比了煤岩与砂岩的裂缝界面应变分布规律。有限元法模拟表明:煤岩与砂岩的应力分布有较大差异,煤岩裂缝的最大应变约为砂岩裂缝最大应变的25倍,且煤岩裂缝更容易闭合;结合煤岩裂缝在不同有效应力条件下的应变规律,给出了渗透率随有效应力变化的拟合公式。参照砂岩应力敏感实验程序,对不同围压下煤岩渗透率变化规律的实验研究发现,渗透率拟合公式计算值与实验实测值变化趋势一致,部分煤样渗透率实验值与预测值平均误差小于10%,拟合精度高。研究结果对预测实际煤岩的渗透率和不同有效应力下煤岩渗透率的变化规律具有较高的实用价值。 |
| 关 键 词： | 煤岩渗透率 裂缝 有效应力 有限元法 应力敏感性 |
Application of the finite element analysis in coal and rock stress-sensitivity |
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| LU Yuan,YI Xiangyi,YANG Zhi,ZHANG Hao,GUAN Baoshang.Application of the finite element analysis in coal and rock stress-sensitivity[J].Coal Geology & Exploration,2011,39(2). | |
| Authors: | LU Yuan YI Xiangyi YANG Zhi ZHANG Hao GUAN Baoshang |
| Institution: | LU Yuan1,YI Xiangyi1,2,YANG Zhi1,ZHANG Hao1,GUAN Baoshang3(1.College of Energy Resources Chengdu University of Technology,Chengdu 610059,China,2.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,3.Branch of Langfang of Research Institute of Exploration and Development of Chinese Petroleum,Langfang 060507,China) |
| Abstract: | This paper utilizes finite element software to compare fracture interface strain distribution in coalbed and sandstone.Finite element method shows that the stress distribution of coalbed and sandstone is quite different,coalbed fracture maximum strain is 25 times as the sandstone fracture,and the fracture closure is easier for coalbed,combined with the regular pattern of coalbed fracture in the conditions of different effective stress,a fitting formula of permeability change with effective stress was given.... |
| Keywords: | coalbed-permeability fracture effective-stress finite element stress-sensitive |
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