Coal (rock) and gas outburst is one of intense natural disaster, is also a complicated and dynamical phenomenon, caused by stress, gas pressure of coal bed as well as coal structure.
煤(岩)与瓦斯突出是煤矿严重的自然灾害之一，且是一种复杂的动力现象，是地应力、煤层中的瓦斯压力和煤的结构力学性质综合作用的结果。
Main geologic factors that influence recoverability of coal-seam gas include coal-bed permeability, reservoir pressure, gas saturation and desorption rate.
影响煤层气可采性的主要地质因素有：煤层的渗透性、储层压力、含气饱和度、解吸率等。
This paper mainly researches on the technique of draining long distance pressure relief gas in bed plate tunnel under the circumstance of mining protective coal seam.
本论文主要是针对远程下保护层开采条件下，对底抽巷上向穿层钻孔抽放远程卸压瓦斯技术进行了深入的研究。
As for the coal-bed gas reservoirs with constant pressure boundary, the log-log pressure curves are horizontal lines and the log-log pressure derivative curves are falling rapidly in the late stage.
对于存在定压边界煤层气藏，压力双对数曲线的晚期是水平直线段，压力导数双对数曲线的晚期都是急剧下掉的曲线。
To measure gas pressure is always a difficult problem, especially mensuration in coal bed is more difficult to guarantee.
瓦斯压力测定一直是个难题，尤其在煤层里测定更是难以保证。
As for a closed coal-bed gas reservoir, all the curves of pressure and pressure derivative are straight line with the slope equal to 1.
对于全封闭煤层气藏，所有压力和压力导数曲线是斜率为1的直线段。
Based on the low pressure of the coal bed gas well, the sand removal technology by mechanical sand fishing is put forward.
根据煤层气井的低压特点，提出了通过机械捞砂来清砂的技术。
This paper introduces the features of coal-bed gas reservoir, and points out that most of coal-bed gas reservoir in China are of low pressure, low permeability and low productivity.
介绍了煤层气储层特点，指出我国煤层气储层多为低压、低渗透、低产能的。
This paper introduces the features of coal-bed gas reservoir, and points out that most of coal-bed gas reservoir in China are of low pressure, low permeability and low productivity.
介绍了煤层气储层特点，指出我国煤层气储层多为低压、低渗透、低产能的。
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