煤层气洞穴完井顶板塌落数值模拟研究  

Numerical Simulation of the Roof Fall on Open-hole Cavity Completed Coal-bed Gas Wells

作　　者：艾传志[1] 杨虎[2] 王芝银[1] 

机构地区：[1]中国石油大学(北京)城市油气输配技术北京市重点实验室,北京102249 [2]新疆油田公司勘探开发研究院,新疆克拉玛依824000

出　　处：《湖南科技大学学报（自然科学版）》2008年第2期5-8,共4页Journal of Hunan University of Science And Technology：Natural Science Edition

基　　金：教育部创新团队研究项目(IRT411)

摘　　要：针对我国主要煤层气产区的煤层埋深、煤层厚度、煤层及顶板岩石力学特性,对不同埋深和煤层厚度条件下的裸眼洞穴使用有限差分方法进行了数值模拟.计算结果表明,造成洞穴顶板塌落的主要力学因素是垂直地应力与水平地应力之差,可由侧压系数来描述;顶板破坏形式为洞周剪切破坏;煤层厚度对其影响较小.In view of the coal bed depth of burial, thickness of coal layer, mechanical characteristics of the coal layer rock and the roof rock, the open-hole caves with different buried depth and different coal layer thickness was simulated with the finite difference method. The results show that the fall of the roof depends on the difference of the vertical initial stress and the horizontal initial stress, which can be described by the reciprocal of the lateral compression coefficient, the damage form of roof is shear failure at the cave edge, the thickness of coal layer has little influence on it. 6figs.,4tabs., 9refs.

关 键 词：煤层气 洞穴完井 数值模拟 塌落 

分 类 号：TE257[石油与天然气工程—油气井工程]