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Effect of gas compressibility factor estimation in coal sorption isotherms accuracy

机译:煤吸附等温线精度气体可压缩因子估计的影响

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Compressibility factor (CF) is a key parameter in gas industry, regarding gas flow and storage in a gas reservoir. This study highlights the necessity to accurately estimate CF, affecting reservoir sorption capacity determination. The effect of the CF of N-2, CH4 and CO2 in the coal porous structure was studied. Sorption isotherms showed no significant hysteresis regarding N-2, due to gas inert behaviour. CH4 has a higher CF slope and the hysteresis behaviour is stronger than in N-2 . CO2 has no linear CF behaviour and besides relevant hysteresis, a distinct general trend between both curve shapes was identified, and the CO2 desorption curve intercepted the CO2 adsorption curve at 30 x 10(5) Pa. This is due to CO2 retention on coal porous structure, thanks to the great affinity between CO2 and the organic microporous structure, to pressures up to 6.9 x 10(5) Pa. The gas mixture showed a significant hysteresis due to its composition.
机译:可压缩因子(CF)是气体工业中的一个关键参数,包括气体储层中的气体流量和储存。 本研究突出了准确估计CF的必要性,影响储层吸附能力测定。 研究了N-2,CH4和CO2中的CF在煤多孔结构中的影响。 由于气体惰性行为,吸附等温线显示出关于N-2的显着滞后。 CH4具有更高的CF斜率,滞后行为比N-2更强。 CO2没有线性CF行为,除了相关的滞后之外,鉴定了两个曲线形状之间的明显的一般趋势,并且CO2解吸曲线在30×10(5)PA下截取了CO 2吸附曲线。这是由于煤多孔的CO2保留 结构,由于CO2和有机微孔结构之间的巨大亲和力,压力高达6.9×10(5)PA。气体混合物由于其组成而显示出显着的滞后。

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