Study of displacement behavior and dispersion characteristics based on low-field NMR in the context of CO2 geological sequestration and enhanced methane recovery
Shezhan Liu , Yi Zhang , Yuechao Zhao , Zhiguo Wang , Yongchen Song , Junchen Lv
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引用次数: 0
Abstract
Visual characterization of the spatial and temporal distribution patterns of displacing fluids and CH4 within the pore space and exploration of the differences in sweep effect on CH4 are key to predicting the scale of CO2 geological sequestration and production capacity within the reservoir. There are large differences in the displacement efficiency of CH4 in the pore space by different components of the displacing fluid. In this study, the more cost-effective displacing fluid injection scheme is explored on the basis of CO2 sequestration and enhanced gas recovery. Thus, the displacement behavior and dispersion characteristics of CO2, gas mixture (50 % CO2 + 50 % N2) and N2 at the pore scale are investigated. N2 has the highest overall sweep efficiency during displacement, but it also causes the greatest degree of mixing. In contrast, liquid and supercritical CO2 has the weakest diffusion ability and the lowest overall sweep efficiency on CH4, but cause the least mixing. In addition, it is found that the dispersion coefficients of all three displacing fluids become smaller with increasing pressure, with the entrance/exit effect causing the CO2 dispersion coefficients to increase by 11.3 % to 23.4 %.
期刊介绍:
The exploration of energy sources remains a critical matter of study. For the past nine decades, fuel has consistently held the forefront in primary research efforts within the field of energy science. This area of investigation encompasses a wide range of subjects, with a particular emphasis on emerging concerns like environmental factors and pollution.