超临界CO2作用下煤体渗透性与孔隙压力–有效体积应力–温度耦合规律试验研究

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Abstract According to the difficult problems of the generally low permeability in Chinas high gas seam and low gas extraction efficiency，using the characteristic of supercritical CO2 which could improve the permeability of porous media，research the flow rule of supercritical CO2 after injected into the low permeability coal seam sample by designing the conditions orthogonally with different temperature，pore pressure，axial compression and confining pressure. The results show that：the permeability and the permeability coefficient of the coal sample trend to be a negative exponential declining rule with the effective volume stress after the action of supercritical CO2；the permeability coefficient and pore pressure trend to be a positive exponential increasing rule；the permeability and the permeability coefficient both trend to be a negative exponential declining rule with the temperatures increasing；under the action of effective volume stress，temperature and pore pressure，the permeability coefficient satisfies the relation：，the supercritical CO2 pore pressure plays a leading rule in improving the coal samples permeability when the effective volume stress is a unchanged；the density and dynamic viscosity of supercritical CO2 present a negative exponential decreasing trend with temperatures increasing，and present a linear increasing change rule with pore pressure，and is sensitive to temperature and pressure around the critical point；after the action of supercritical carbon dioxide，intensive honeycomb like pore and fracture appears，the permeability of coal improved significantly，supercritical CO2 has a better influence on improving the permeability of the coal seam.

Key words： rock mechanics supercritical CO2 permeability temperature pore pressure effective volume stress

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https://rockmech.whrsm.ac.cn/EN/Y2013/V32/Is2/3760

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