低渗透煤层瓦斯解吸渗流规律的试验研究  

Experimental on Desorption and Seepage of Gas in Low Permeability Coal Seam

作　　者：马玉林[1] 张永利[1] 程瑶[1] 李成全[1] 章梦涛[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

出　　处：《煤矿安全》2009年第4期1-4,共4页Safety in Coal Mines

基　　金：国家自然科学基金资助项目(50674053)

摘　　要：如何提高煤层气采收率是目前煤层气开发的重点课题。通过实验揭示了温度是影响煤层气渗透率及解吸渗流量的关键因素之一,得到了非等温条件下煤层气解吸-渗流规律。实验通过自制的温控三轴煤层气解吸渗透仪进行规律探究。经数据拟合,分析得出:不同温度条件下,渗透率随孔隙压力的增加以指数形式递增;在相同围压、轴压和孔隙压力条件下,等温解吸时,煤样瓦斯渗流量随温度的增加而呈现指数递减规律;升温解吸时,解吸量比低温下的渗流量增加,孔隙压力越大,渗流量增加越明显。根据试验结果,认为在注热开采煤层气时,通过间歇式注热(蒸汽吞吐)使煤层温度梯度不断变化,煤层发生升温解吸,有利于煤层气的产出。对低渗透煤层瓦斯开采提出新的思路。The priority research area of the coal - bed methane exploitation is how to increase the recovery rate of it at present. By the experiment it is discovered that the temperature is one of the key factors which influence the seepage rate and quantity of desorption. The regularity between desorption and the seepage is found. The experiment apparatus is a three - dimension stress with temperature control that is home - made. Fitted the dates by nonlinear curve fitting functions and analyzed their nonlinear least squares fitters. The nonlinear curve fitting functions are exponential functions. Some of the cm＇ves indicate that the seepage rate increases with the increasing of the pore pressure under different temperature. Some of the curves indicate the seepage quantities which are desorbed under the same temperature decrease with the increasing of the temperature under the same confining pressure, axial pressure and pore pressure. The seepage quantities are more than the low temperature＇s when the temperature increases. Furthermore the increment of the seepage quantity is very obvious when the pore pressure increases. It avails the output of the coal - bed methane by the intermittent heating which gets the temperature gradient increasing. All above offer a new idea for the low - permeability coal - bed methane exploitation.

关 键 词：瓦斯 温度 渗透率 渗流量 

分 类 号：TD712.52[矿业工程—矿井通风与安全]