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中、高阶煤样甲烷吸附应变及渗透性实验分析 被引量:10

Laboratory investigation on methane sorption-induced strain and permeability in middle and high rank coal samples
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摘要 煤中气体吸附膨胀和解吸收缩应变是影响煤层气井排采中煤储层渗透率动态变化的重要因素。通过选取沁水盆地南部和鄂尔多斯盆地东缘二叠系山西组中、高阶煤样,通过煤的吸附变形-渗流模拟实验,测得了中、高阶煤样中甲烷吸附应变值,提出了采用12~24 h的吸附应变数据点拟合计算吸附应变的方法,分析了高、中阶煤中甲烷吸附应变及其渗透性的差异性,揭示了中、高阶煤吸附应变规律及其对渗透性的影响及控制机理。结果表明,中、高阶煤样甲烷吸附应变与吸附平衡压力之间的关系符合Langmuir等温吸附模型;中阶煤中吸附甲烷气体的Langmuir径向应变、轴向应变和体积应变分别为0.18×10^(-2),0.09×10^(-2)和0.44×10^(-2),其对应的Langmuir压力分别为5.26,6.93和5.42 MPa;而高阶煤吸附甲烷气体的Langmuir径向应变、轴向应变和体积应变分别为1.91×10^(-2),0.22×10^(-2)和3.99×10^(-2),其对应的Langmuir压力分别为7.87,4.57和7.49 MPa。在有效应力一定的条件下,随着煤中甲烷吸附平衡压力增高,煤样吸附应变增大,且高阶煤吸附应变明显要强于中阶煤样,煤中甲烷吸附应变主要受控于煤中甲烷吸附量。在有效应力一定的条件下,中煤阶煤样的渗透率要大于高煤阶煤样的渗透率,煤中甲烷吸附应变过程中,中、高阶煤样随着煤中甲烷吸附平衡压力增高,煤样渗透率均按负指数函数规律降低,且高阶煤样中甲烷吸附应变对煤样渗透率的影响要强于中阶煤样,因此在煤层气井排采过程中,在临界解吸压力后,高煤阶煤层气井产量提升效果要好于中煤阶煤层气井。 The gas ad-/de-sorption induced swelling and shrinkage strain in coal are important factors that influence the dynamic change of coal permeability during coalbed methane(CBM)extraction.In this study,the middle and high-rank coal samples of Permian in eastern Ordos Basin and southern Qinshui Basin were selected.A series of experimental measurements on the sorption induced strain using a desorption-seepage testing system was carried out.The adsorption strain values of middle and high rank-coals were measured,and the method of calculating adsorption strain by fitting the 12-24 hours’adsorption strain data points was proposed.The differences of adsorption induced strain and permeability evolution between high and middle-rank coals were analyzed.The law of adsorption induced strain and its influence on the permeability of medium and high-rank coals and both control mechanism were revealed.The results show that the relationship between methane adsorption strain and equilibrium pressure in middle and high rank coal samples conforms to the Langmuir isothermal adsorption model.The Langmuir radial strain,axial strain and volumetric strain induced by the CH4 adsorption of middle-rank coal are 0.18×10^(-2),0.09×10^(-2) and 0.44×10^(-2),respectively and the corresponding Langmuir pressures are 5.26,6.93 and 5.42 MPa.The Langmuir radial strain,axial strain and volumetric strain induced by CH4 adsorption of high-rank coal are 1.91×10^(-2),0.22×10^(-2) and 3.99×10^(-2),respectively,and the corresponding Langmuir pressures are 7.87,4.57 and 7.49 MPa.At a constant effective stress,with the increase of adsorption equilibrium pressure of coal,the adsorption induced strain increases,and the adsorption induced strain of high-rank coal is obviously higher than that of medium-rank coal.The gas adsorption induced strain in coal is mainly controlled by the gas adsorption capacity in coal.Meanwhile,at a constant effective stress,the permeability of middle-rank coal is higher than that of high-rank coal.With the increase of adsorption equilibrium pressure,the permeability declines by a negative exponential function of different rank coals.The rate of permeability reduction of high rank coal is higher than that of low rank coal.In the process of CBM drainage and production,after the reservoir pressure declines to below a critical desorption pressure,the effect of CBM wells production improvement of high-rank is better than that of middle-rank.
作者 孟雅 李治平 唐书恒 赖枫鹏 MENG Ya;LI Zhiping;TANG Shuheng;LAI Fengpeng(School of Energy Resources,China University of Geosciences(Beijing),Beijing 100083,China;Beijing Key Laboratory of Geology Evaluation and Development of Unconventional Natural Gas,China University of Geosciences(Beijing),Beijing 100083,China;State Key Laboratory of Coal and CBM Comining,Jincheng 048012,China)
出处 《煤炭学报》 EI CAS CSCD 北大核心 2021年第6期1915-1924,共10页 Journal of China Coal Society
基金 国家自然科学基金资助项目(42002181) 国家自然科学基金联合基金重点资助项目(U1910205) 2020年度山西省科技计划揭榜招标资助项目(20201101002-03)。
关键词 中、高阶煤样 吸附应变 渗透性 煤层气 LANGMUIR模型 middle and high-rank coal samples coalbed methane adsorption induced strain permeability Langmuir model
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