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- W4313585958 abstract "Permeability is one of the most important parameters for characterizing fluid flow and production from reservoirs. In this paper, experimental studies on the percolation, permeability, and adsorption of supercritical CO 2 in coal seams were carried out, taking into account the effects of injection pressure and temperature, comparing the changes in longitudinal wave velocity of specimens before and after the tests, and analyzing the permeability effect of supercritical CO 2 on raw coal specimens. The test results showed that when the volume stress was 36 MPa, the permeability of supercritical CO 2 in coal increased by 93%, on average, compared with that of CO 2 . The modified D-R model was used to fit the adsorption data, and it was found that the excess adsorption capacity of supercritical CO 2 by coal decreased with increased pressure, with a maximum value of approximately 8 MPa. When the temperature increased by 10°C, the adsorption capacity decreased by 8.3%, on average. In the subcritical CO 2 state, the trend of excess CO 2 adsorption in coal was consistent with that of absolute adsorption, which was 16% higher than that of excess adsorption, on average. After the action of supercritical CO 2 , the propagation velocity of the longitudinal wave in the sample decreased significantly, indicating that supercritical CO 2 can effectively promote the development of pores and fractures in the coal sample, with an obvious anti-reflection effect on the coal seam and the best permeability enhancement effect at 35°C." @default.
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- W4313585958 date "2023-01-04" @default.
- W4313585958 modified "2023-09-30" @default.
- W4313585958 title "Experimental study on coal seam permeability enhancement and CO2 permeability caused by supercritical CO2" @default.
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- W4313585958 doi "https://doi.org/10.3389/feart.2022.1062580" @default.
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