基于煤岩割理正交各向异性的煤层气产能预测  

Production Prediction with the Consideration of the Orthotropic Permeability of Coal Seam

作　　者：王保辉[1] 闫相祯[2] 杨秀娟[2] 

机构地区：[1]潍坊学院建筑工程学院,潍坊261061 [2]中国石油大学华东储运与建筑工程学院,青岛266580

出　　处：《科学技术与工程》2017年第32期229-232,共4页Science Technology and Engineering

基　　金：国家科技重大专项(2011ZX05036-001)资助

摘　　要：考虑煤岩面割理和端割理两个方向不同渗流性质,建立了煤岩割理正交各向异性数学模型,通过引入煤岩弹性模量折减系数解决了煤岩割理刚度较难测定的问题。基于该模型对鄂尔多斯盆地东部煤层单井产能进行了模拟计算,分析了割理渗透率正交各向异性系数、煤层厚度、煤层孔隙度和含气量等参数对煤层单井产能的影响规律。计算结果表明:煤层气单井产能随着渗透率正交各向异性系数、煤层厚度和含气量增加而增大,随着煤层孔隙度的增加而减小。According to the basis of the orthotropic physical properties of coal cleats and different seepage characteristics in the orientation of the face and butt cleats,the orthotropic permeability model of coalbed methane output forecasting is established.By introducing the elastic modulus reduction factor,the difficulty for the determination of the cleat stiffness is solved effectively.The numerical simulations of well in Ordos Basin are carried out basing on the orthotropic permeability model.The calculating results are compared to verify the precision of the proposed model.The influences of the permeability orthotropic coefficient,thickness,porosity,gas content,and etc on the coalbed methane output forecasting are studied.The examples show that the gas rates increase with the increase of the permeability orthotropic coefficient,the thickness and gas content,whereas it decreases with the increase of porosity.

关 键 词：煤层气 煤岩割理 正交各向异性 数值模拟 

分 类 号：TD353[矿业工程—矿井建设]