无烟煤及泥岩储层不同压力下气体吸附特征研究  

Study on gas adsorption characteristics of anthracite and mudstone reservior under different pressure

作　　者：李长龙[1] 吴世跃[1] 张美红[1] 李元星[1] 

机构地区：[1]太原理工大学矿业工程学院,山西太原030024

出　　处：《煤炭科学技术》2016年第11期154-159,共6页Coal Science and Technology

摘　　要：为了研究无烟煤与泥岩作储层条件下的气体吸附特征,采用吸附常数测定装置,选取程庄煤矿9号煤层无烟煤样及其泥岩顶板,在温度20℃、压力2.5 MPa条件下分别进行吸附CO_2、CH_4及O_2的气体吸附试验,利用Langmuir、BET和D-R模型拟合了试验数据,结果表明:随试验压力增大,无烟煤对CO_2的吸附量及泥岩对O_2的吸附量显著增加,而无烟煤对O_2的吸附量及泥岩对CH_4的吸附量增加不明显;同时,无烟煤、泥岩吸附O_2的D-R模型中常数D值相近,而吸附CO_2、CH_4的常数D值则是泥岩均大于无烟煤,说明泥岩的孔径分布相对于无烟煤更加集中;无烟煤的吸附气体速率在整个过程均快于泥岩,选择性吸附现象表现明显,而泥岩的吸附速率分布平缓前、后半段变化不大,选择性吸附不明显。In order to study the gas adsorption characteristics of anthracite and mudstone reservior under the condition of different pressure, the isothermal adsorption experiments,selected No.9 coal seam as experimental samples in Chengzhuang Mine,were done under the condition of 20~C and 2.5 MPa with CO2 ,CH4 and O2.The adsorption constant determination respectively was used. Using Langmuir, BET and D-R model to fit the experimental data,the results showed that the anthracite adsorption capacity of CO2 and the mudstone adsorption capacity of 02 increased significantly with the pressure increasing,but the anthracite adsorption capacity of 02 and the mudstone adsorption capacity of CH4 were increased not obviously; the value of D-R model constant D of the adsorption of anthracite and mudstone adsorption of O2 was close,but the D-R model constant D of CO2 and CH4 of mudstone were greater than anthracite, It indicated that the aperture distitubute of mudstone was more concentrated than anthracite ; The adsorption rate Of anthracite on different gas was faster than the mudstone in almost the whole process,but the adsorption rate of coal on different gas changed larger than mudstone during the former and the second half process. The selective phenomenon of adsorption was more obvious than mndstone and the adsorption rate distribution of mudstone was flat.

关 键 词：无烟煤 泥岩 压力条件 孔径分布 选择性吸附 

分 类 号：TE122[石油与天然气工程—油气勘探]