致密气吸附能力影响因素研究

Influencing Factors of Tight Gas Adsorption Capacity

为研究不同条件下致密气吸附量的变化规律,为致密气藏开发提供理论依据,针对致密气吸附的不同影响因素,自行设计完成致密气吸附解吸试验设备,对影响致密气吸附量的温度、粒径、有机质含量、含碳量等不同因素开展了研究。研究结果表明,在温度接近室温时,用Langmuir吸附模型拟合效果较好,而在温度过高条件下,因为Langmuir模型吸附过程中没有考虑吸附热对吸附的影响,Langmuir吸附模型对实验数据的拟合较差。实验过程中应用60~80目粒径的页岩颗粒进行吸附测试,比较吻合致密气吸附实际。致密气吸附量随着有机质质量分数的增加而增大,受含水率等因素干扰,吸附量与有机质质量分数呈正相关关系。

In order to study the change law of tight gas adsorption capacity under different conditions and provide theoretical basis for the development of tight gas reservoirs,the shale gas adsorption and desorption test equipment was designed and completed based on different influencing factors of shale gas adsorption.Research on different factors such as temperature,particle size,organic matter content,and carbon content that affect shale gas adsorption was conducted,which provides a basis for accurately measuring the calculation of shale gas adsorption under different conditions.The research results indicate that when the temperature is close to room temperature,the fitting effect of the Langmuir adsorption model is better.Under high temperature conditions,because the Langmuir model does not consider the effect of adsorption heat on adsorption,the fitting effect of the Langmuir adsorption model on experimental data is poor.During the experiment,shale particles with a particle size of 60-80 mesh were used for adsorption testing,which is more in line with the actual adsorption of shale gas.The adsorption capacity of shale gas increases with the increase of organic matter content,and is positively correlated with organic matter content due to interference from factors such as water content.