煤层气储层含水率对煤层气渗流影响的试验研究

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摘要以晋城煤业集团赵庄矿3#煤层无烟煤制备的成型煤样为研究对象，设计煤样含水率对甲烷渗流的影响试验方案，利用自行研制的“含瓦斯煤热流固耦合三轴伺服渗流试验装置”，较真实地模拟在煤层气开采中煤储层含水率的变化对煤层气渗流的影响规律。研究结果表明：恒定温度和有效应力、不同含水率条件下，随着煤样含水率的减小，甲烷有效渗透率增大。在本试验煤体含水率范围内，煤体含水率与甲烷有效渗透率关系可用线性函数表述。煤储层中的水通过占据煤储层渗流孔隙空间，使煤层气运移喉道减小，使其运移困难。根据对试验结果的分析，理论上论证可以把注水湿润煤体作为防治煤与瓦斯突出的措施之一。

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关键词 ：采矿工程, 渗透率, 煤层气储层, 含水率, 渗流, 甲烷

Abstract：The studied specimen was briquettes molded by coal from 3# coalbed of Zhaozhuang coal factory，Jincheng Coal Industrial Company. An experimental plan was designed to test the influence of water content on methane permeability. By using self-developed “coal containing gas thermal-hydrological-mechanical(THM) coupling experimental equipment”，the change rule of water content effects permeance of coalbed methane was studied. The research results showed that：under the conditions of constant temperature and effective stress but different water contents，the methane effective permeability increased with the decreasing of water content in coal. In the range of water content tested in this experiment，the relationship between water content of coal and methane effective permeability could be expressed by a linear function. The water in coalbed gas reservoirs occupies space of permeance pores in coal seams and decreases methane transportation passages which makes the transportation difficulty. According to the analysis of experimental results，it is theoretically proven that to wet the coal by pouring water could be used as a measure to prevent coal and gas outburst.

Key words： mining engineering permeability coalbed gas reservoir water content seepage methane

收稿日期: 2010-07-01

引用本文:

尹光志1，2，3，蒋长宝1，2，3，许江1，2，3，彭守建1，2，3，李文璞1，2，3. 煤层气储层含水率对煤层气渗流影响的试验研究[J]. 岩石力学与工程学报, 2011, 30(S2): 3401-3406.
YIN Guangzhi1，2，3，JIANG Changbao1，2，3，XU Jiang1，2，3，PENG Shoujian1，2，3，LI Wenpu1，2，3. EXPERIMENTAL STUDY OF INFLUENCES FOR WATER CONTENT IN COALBED GAS RESERVOIRS ON METHANE SEEPAGE. , 2011, 30(S2): 3401-3406.

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http://www.rockmech.org/CN/Y2011/V30/IS2/3401

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