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为了研究超临界二氧化碳对煤层渗透性的影响,利用自制的三轴渗透仪,在恒定温度和恒定孔隙压力下,不同有效应力条件下,进行三轴渗流实验,结果表明:在温度和孔隙压力一定的条件下,煤样渗透率随着有效应力的增大呈现负指数递减规律,有一定的函数关系式.同一有效应力下,渗透率随孔隙压力的增大而增大,孔隙压为7.9 MPa时的渗透率高于孔隙压为7.7 MPa和7.5 MPa的渗透率,该研究成果将为利用超临界二氧化碳改造低渗透煤层的渗透性提供重要的科学依据.
In order to study the influence of supercritical carbon dioxide on the permeability of coal seam, a three-axis seepage experiment was carried out under self-made three-axis infiltrometer at constant temperature and constant pore pressure with different effective stress. The results show that when the temperature and pore pressure are constant Under the same effective stress, the permeability increases with the increase of pore pressure, and the pore pressure is 7.9 MPa Permeability is higher than the pore pressure of 7.7 MPa and 7.5 MPa permeability, the research results will provide an important scientific basis for the use of supercritical carbon dioxide to transform the permeability of low permeability coal seam.