煤层气井排采诱导渗透率变化模型研究  

Model Study on CBM Well Drainage Induced Changes in Permeability

作　　者：李洪波[1] 韦重韬[1] 张晓莉[1] 李来成[1] 

机构地区：[1]中国矿业大学资源与地球科学学院,江苏徐州221008

出　　处：《能源技术与管理》2009年第5期58-61,共4页Energy Technology and Management

基　　金：国家863项目:基于渗透率排采变化的煤层气井产能数值模拟新技术(2006AA06Z231)

摘　　要：目前,国内外关于煤层气排采理论方面很少考虑两相流体与煤体结构的耦合作用,缺少对吸附、解吸、扩散和渗流过程的相互制约机制研究。本文借鉴了已有煤岩石力学分析测试数据和煤储层多相渗流渗透率研究成果,采用数值模拟的研究方法,建立煤储层流体排出和煤基质弹性体积变形与煤储层渗透率变化之间关系的数学模型。通过实例计算,分析了储层压力和煤级等因素对煤储层渗透率变化的影响,得出渗透率综合变化率值随着煤级和流体压力的降低逐渐变大。At present, the theory, of CBM drainage regards the coupling effect of two-phase flow and coal body structure very little, and lacks of studying on adsorption, desorption, diffusion and percolation process mutual control mechanism both in China and in overseas. This paper draws on existing coal-rock mechanics analysis and testing data and coal reservoir multiphase flow of permeability research results, adopts numerical simulation research method, establishes mathematical model of the relationship among coal reservoir flow, the volume of coal matrix elastic deformation and coal reservoir permeability changes. Through the example of calculation, factors affecting coal reservoir permeability changes, such as reservoir pressure and vitrinite reflectivity have been analyzed, and the Permeability integrated Changes value becoming larger as the reduced coal rank and fluid pressure has been educed.

关 键 词：煤层气 渗透率 数学模型 煤基质收缩 有效应力 

分 类 号：P618.11[天文地球—矿床学]