煤岩渗透率稳态法测试实验中两个问题的探讨  

Discussion on two issues of test experiment with coal and rock permeability steady state method

作　　者：许小凯[1] 陈亮[2] 张玉贵[3] 

机构地区：[1]中国矿业大学(北京)地球科学与测绘工程学院,北京100083 [2]中国矿业大学(北京)资源与安全工程学院,北京100083 [3]河南理工大学河南省瓦斯地质与瓦斯治理重点实验室-省部共建国家重点实验室培育基地,河南焦作454000

出　　处：《煤炭科学技术》2016年第8期104-108,共5页Coal Science and Technology

基　　金：国家科技重大专项资助项目(2011ZX05040-005);河南省高校科技创新团队支持计划资助项目(14IRTSTHN002);河南省瓦斯地质与瓦斯治理重点实验室-省部共建国家重点实验室培育基地外部开放基金资助项目(WS2013A11);河南省教育厅科学技术重点研究资助项目(14A440008)

摘　　要：针对煤的低强度、非均质和对气体的强吸附性等特点,探讨了在煤岩稳态法渗流试验中,型煤是否能够代替原煤和吸附平衡条件对渗透率测量的影响这2个重要问题。分析认为型煤制样是一个将原煤孔裂隙结构破坏、简化的失真重塑过程,因此为了更加真实的探测煤岩的渗透性,建议在渗透试验中尽量使用原煤样。实际的煤层气抽采是一种吸附平衡被逐渐打破的放气式渗流状态,吸附平衡前的渗流测量是一种仅在主渗孔裂隙内发生固-气耦合的充气式测量方式,因此在研究煤岩的吸附性对瓦斯渗流的影响特征时,不建议采用吸附平衡前的稳态渗流测量方法。A low strength,heterogeneity,high gas adsorption and other features of the coal would make the consideration on the two special issues of the sample preparation and adsorption equilibrium condition in the seepage experiments with the coal and rock steady state method. In combination with the previous experiment study results,a detail discussion was conducted that the briquette could replace the raw coal and the adsorption equilibrium condition could be affected to the permeability measurement. The paper hold that briquette sample would be a process to destructure raw coal pore crack structure and to be a reconstruction of the simple distortion. In order to more actually detect the coal and rock permeability,the raw coal samples applied to the permeability experiment were proposed. The actual coalbed methane drainage would be a degassing seepage state with an adsorption equilibrium steadily broken. Before the adsorption equilibrium,the seepage measurement would be a gas-solid coupling inflatable measuring method within the major cracks of the permeability hole. In the study on the coal and rock adsorption affected to the features of the gas seepage,before the adsorption equilibrium,the steady state seepage measuring method could not be recommended.

关 键 词：稳态法 渗透率 型煤 原煤样 吸附平衡 

分 类 号：TD315[矿业工程—矿井建设]