科研之友
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摘要
In view of the failed field testing of CO2-ECBM technology, the feasibility and applicability of the CO2-ECBM process were analyzed based on interactions among CO, H2O, and minerals in the coal reservoir by conducting flooding experiments of coal samples using nuclear magnetic resonance (NMR) technology. CO2 can change the wettability of the coal surface, and adsorbed water can be changed into free water. CO2 is adsorbed constantly on the coal surface, leading to the swelling of the coal matrix. The effects of the dissolution of minerals and flooding pressure can, to some extent, improve the permeability of reservoir, but the improvement of permeability is not obvious with increasing effective stress. Because of severe stress sensitivity, fluid in the ultralow-permeability and deep coal reservoir flows with difficulty. Furthermore, the swelling of the coal matrix leads to an increase of the effective stress, which, in turn, quickly reduces the permeability. It is difficult to compensate the negative effects of stress sensitivity and swelling of the coal matrix with the positive effects of CO2-ECBM technology. Therefore, the application of CO2-ECBM technology should be taken into consideration in the exploitation of ultralow-permeability and deep coal reservoir.
- 出版日期2017-9
- 单位中国矿业大学（北京）
