基于Ono-Kondo格子模型的深部煤储层CH4吸附特征研究
Study on Adsorption Characteristics of CH4 in Deep Coal Reservoir Based on Ono-Kondo Lattice Model
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摘要: 为更准确研究深部煤储层煤层气的吸附特征，了解温度、压力、水等因素对煤层吸附CH4的影响，基于等温吸附实验，采用简化的Ono-Kondo格子模型的拟合方法，精确描述了4种煤级煤在不同温压条件下与不同流体作用前后的CH4等温吸附曲线。结果表明：压力会对CH4的吸附产生正效应，温度会对CH4的吸附产生负效应；压力越大，吸附量受温度影响程度越大；水分会降低煤对CH4的最大吸附容量，不利于CH4吸附；超临界CO2萃取作用，能够增大煤的微孔比表面积和孔体积，从而提高煤层CH4的最大吸附量；CH4的最大吸附量随煤级的变化呈现出“U”型关系。
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关键词:
- Ono-Kondo格子模型 /
- 深部煤储层 /
- CH4 /
- 吸附特征 /
- 微孔
Abstract: To more accurately study the adsorption characteristics of coalbed methane in deep coal reservoirs, and to understand the effects of different factors such as temperature, pressure and water on adsorption of CH4 in coal seams, we accurately described the isothermal adsorption curves of CH4 in four different rank coals under different temperature and pressure conditions, before and after different fluids. In this paper, we adopted simplified Ono-Kondo lattice model fitting method. The results show that pressure has a positive effect on adsorption of CH4, and temperature has a negative effect on adsorption of CH4. The higher the pressure is, the greater the influence of adsorption on temperature. Moisture will reduce the maximum adsorption capacity of coal to CH4, which is not conducive to adsorption of CH4. Supercritical CO2 extraction can increase the micropore surface area and pore volume of coal to increase the maximum adsorption capacity of CH4 in coal seam. The maximum adsorption amount shows a “U” type relationship with the change of coal rank.-
Keywords:
- Ono-Kondo lattice model /
- deep coal reservoir /
- CH4 /
- adsorption characteristics /
- micropore
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