摘要
为了能更准确地表征页岩等温吸附曲线,研究压力对吸附量的变化范围。通过等温吸附模拟实验,获得页岩等温吸附特征曲线、兰氏体积和兰氏压力,利用兰氏模型计算任意压力下的吸附量。并结合球状模型,拟合压力和吸附量的计算表达式,建立计算吸附量的新方法。用新方法计算结果可知,在不考虑温度的影响下,页岩吸附气体达到饱和时的最大吸附气量要比等温吸附实验条件下页岩饱和吸附量(兰氏体积)大。压力存在一定的变程,不同的压力范围,页岩吸附气量的增加速率不同,随着压力的增大,页岩吸附气量的增加速率由大变小,直至减小为零,吸附气量不再变化。此方法能准确地给出吸附量与压力的变化范围,能给定压力和吸附量的界限值,可评价页岩吸附量饱和值。此研究是一种评价等温条件下页岩吸附量的好方法,对页岩吸附气含量评价具有一定的指导意义。
In order to make a more accurate characterization of shale adsorption isothermal curve of pressure, on the adsorption quantity variation range. By isothermal adsorption experiments, shale adsorption characteristic curve, LAN＇s volume and LAN＇s pressure are obtained, using the Rankine model under any pressure adsorption. The calculation of adsorption amount, the interpolation functions and spherical fitting model combination, fitting pressure and adsorption quantity of calculation formula is developed for the calculation of adsorption capacity, new method. The new method of calculation results showed that, without considering the temperature, the maximum ad- sorption of shale is greater than the saturation adsorption under isothermal adsorption experimental conditions. Pres- sure here has a certain process of change, in different pressure range, the increasing rate of shale adsorption is dif- ferent, as the pressure increases, the increasing rate of shale adsorption becomes smaller and smaller, until reduced to zero, the amount of adsorption does not change. The method can provide the given adsorption quantity and pres- sure variation range, pressure and adsorption quantity of limits, and can evaluate shale adsorption saturation value. This study is an evaluation of shale adsorption amount of good method under isothermal condition, which has a cer- tain guiding significance.
出处
《科学技术与工程》
北大核心
2013年第16期4659-4662,共4页
Science Technology and Engineering
关键词
页岩
吸附气含量
实验
球状模型
新方法
shale adsorption gas content experiment the spherical model new method
