深部低阶煤瓦斯吸附特性核磁共振试验研究

Title

Nuclear magnetic resonance experimental study on gas adsorptioncharacteristics of deep low rank coal
作者

刘佳佳贾改妮陈守奇马权
Author

LIU Jiajia, JIA Gaini, CHEN Shouqi ，MA Quan
单位

煤炭安全生产河南省协同创新中心河南理工大学安全科学与工程学院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
Organization

1.The Collaborative Innovation Center of Coal Safety Production of Henan Province, Jiaozuo ，China;2.School of SafetyScience and Engineering, Henan Polytechnic University, Jiaozuo ，China;3.State Key Laboratory CultivationBase for Gas Geology and Gas Control (Henan Polytechnic University), Jiaozuo ，China
摘要

为了研究深部低阶煤瓦斯吸附特性，采集新疆艾维尔沟矿深部低阶煤样，采用低场核磁共振技术（NMR）对原煤煤样进行瓦斯吸附试验，并提出了以核磁共振T2（横向弛豫）谱积分面积值作为吸附瓦斯含量的定量表征。试验结果表明：深部低阶煤瓦斯吸附过程T2谱曲线有3个特征峰（吸附峰、游离峰、自由态瓦斯峰）；不同瓦斯压力下，瓦斯吸附总量均随吸附时间的增加而增加，直至保持不变，瓦斯吸附速度先增加后减小；不同瓦斯压力下，深部低阶煤吸附孔的瓦斯吸附量随着吸附时间的增加先增加后保持不变，吸附态瓦斯量与瓦斯压力的关系呈双曲线函数分布，瓦斯压力越大，低阶煤中瓦斯达到吸附平衡时间越长。研究成果对深部低阶煤的煤层气勘探开发和瓦斯抽采具有重要指导意义。
Abstract

This paper presents the results of a gas adsorption experimental study on adsorption characteristics of deep low rank coal gas using low field nuclear magnetic resonance (NMR) technique. The coal samples used in the experiment are low rank coal collected from the Aiweigou mine in Xinjiang. The spectral integral area (dimensionless) of the nuclear magnetic resonance T2 (transverse) is used to quantify the adsorbed gas contents. The experimental results show that there are three characteristic peaks (adsorption peak, free peak, and free gas peak) in the T2 spectrum of deep low rank coal gas adsorption process. Under different gas pressures, both total gas adsorption and gas adsorption capacity increase as the adsorption time increases at the beginning and then remain stable. The gas adsorption rate increases at beginning and then decreases with the increases of adsorption time. The adsorption gas volume correlates with the gas pressure by a hyperbolic function. The higher gas pressure is associated with longer time for the gas in the low rank coal to reach adsorption equilibrium. This research provides an important guidance to exploration and development of deep low rank coalbed methane and gas drainage.
关键词

低阶煤瓦斯吸附核磁共振 T2谱吸附孔
KeyWords

low rank coal; gas adsorption; nuclear magnetic resonance;T2 spectrum; adsorption hole
基金项目(Foundation)

国家自然科学基金资助项目(51604101，51734007，51704099)；中国博士后科学基金资助项目（2019M652536）；河南省博士后科研资助项目（001801016）
相关专题

这篇文章属于“煤层气勘探开发技术研究进展”专题（16篇）

这篇文章属于煤层气勘探开发技术（51篇）
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