液态水影响不同煤级煤吸附甲烷的差异及其机理  

Influence Mechanism of Liquid Water on Methane Absorption of Coals with Different Ranks

作　　者：张时音[1] 桑树勋[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：《地质学报》2008年第10期1350-1354,共5页Acta Geologica Sinica

基　　金：国家重点基础研究发展规划"973"项目(编号2002CB211703);国家高技术研究发展计划项目(编号2007AA06Z220);教育部科学技术研究重大项目(编号307014)资助成果

摘　　要：以IS-100等温吸附解吸仪和MTS815型电液伺服岩石实验系统为主要实验平台,应用已建立的模拟储层条件下煤样注水和注水试样等温吸附实验方法,对3种不同煤级的煤储层样品开展了高压(8～20MPa)注水和等温吸附实验,发现储层条件下煤层中的液态水(注水煤样)对不同煤级(0.46%<Ro,max<1.72%)煤吸附甲烷影响有差异,其含水量随煤级升高呈L型降低,而吸附量则线性增加。笔者认为液态水造成吸附差异的原因是煤体润湿性的差异,对于中低煤级的煤样来说,煤表面的物理化学性质起着控制作用,直接影响着煤体润湿性,吸附势和含水量的曲线都说明了这一点。Based on the established experimental method of water injection coal samples and isothermal adsorption experiments to stimulate real reservoir conditions, the Isothermal Adsorption/Desorption System Model IS-100 and Electrohydraulic Servo Rock System Model MTS815 are used as the main apparatuses to carry on injecting water in coals with different ranks under high pressure （8~20 MPa）. The conclusion was drawn that liquid water of water injection coal have different influence on methane adsorption of different rank coals （0.46%〈Ro,max〈1.72%） under reservoir conditions. The water content decreases in model of ＂L＂ and adsorption capacity increase linearly with the increase of coal rank. The adsorption differences caused by the liquid water are attributed to the wettability differences of coal which are mainly controlled by the physical chemistry property of the coal surface in the low--middle rank, demonstrated by the curves of adsorption potential and water content.

关 键 词：液态水 注水煤样 煤级 吸附势 

分 类 号：P618.11[天文地球—矿床学]