煤层气-水两相流渗透率测定实验研究  

Experiment on the Permeability Rate in the Gas-water Double State Flow of Coal Deposit

作　　者：吕祥锋[1] 潘一山[1] 刘建军[2] 李忠华[1] 唐巨鹏[1] 

机构地区：[1]辽宁工程技术大学力学与工程学院,辽宁阜新123000 [2]西南石油大学建筑工程学院,成都610500

出　　处：《水资源与水工程学报》2010年第2期29-32,共4页Journal of Water Resources and Water Engineering

基　　金：国家自然科学基金项目(50874082);国家自然科学基金青年项目(10502023);辽宁省教育厅高等学校科技计划项目(2008274)

摘　　要：煤的绝对渗透率、气-水相对渗透率在预测煤层气开采中甲烷和水的产率是极为必要的参数。以晋城天地王坡煤矿为例,利用稳态法测定煤层气-水两相流有效渗透率及束缚水状态煤岩绝对渗透率,得到气-水相对渗透率关系曲线及有效应力与气、水有效渗透率关系曲线,揭示一些新的规律:气、水相对渗透率随围压增大而略有增加;气、水有效渗透率随有效应力的增加而降低,降低了其渗透性能;有效应力存在某一分界点,当小于该值时,气、水有效渗透率随有效应力的增加而迅速降低,对于天地王坡煤矿3?煤样测定结果,有效应力分界点为2.7MPa左右;有效应力存在某一临界值,当大于该临界值时,气、水有效渗透率随有效应力的增加而降低,但幅度不大,对于本实验煤样,有效应力临界值为8.5 MPa左右。实验结果可为煤层气的合理抽采提供基本理论依据。The absolute permeability rate of coal and relative permeability rate of gas-water are the necessary parameters for forecasting the birth rate of coalbed methane and water in mining.Taking Tiandiwangpo Mine in Jincheng for example,using the steady-state method to measure the absolute permeability rate of coal,relative permeability rate of gas-water double state flow in the coalbed,the paper obtained the relational curves of the relative permeability rate of gas-water and effective stress with effective permeability rate of gas-water.Some new roles are presented as follows： With the increasing of confines pressure,the relative permeability rate of gas-water was increased slightly;The effective permeability rate of gas-water is decreased with the effective stress increment;There is dividing point for the effective stress when the stress is smaller than it,the effective permeability of gas and water will decrease rapidly with the increment of effective stress.For the coal sample No.3,the dividing point is about 2.7MPa;On the other hand,a critical effective stress is found,the effective permeability rate of gas-water will decrease slightly with the increment of effective when stress is larger than it.For the coal sample No.3,the critical effective stress is about 8.5MPa.The experimental results can provide theoretical basis for reasonable drainage of coalbed methane（CBM）.

关 键 词：煤层气 气-水两相流 渗透率 实验研究 

分 类 号：TD84[矿业工程—煤矿开采]