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用实验方法揭示了高温高压下CO_2注入煤层后发生物理和化学反应对储层特征的影响。CO_2与煤的物理作用会改变煤岩应变和渗透率,随着CO_2注入压力的增大,体积应变增大,围压对煤体应变起抑制作用,围压12 MPa时,煤岩渗透率先降低后增加,围压12 MPa和16 MPa时,渗透率降低增加再降低。CO_2与煤中方解石、钾长石产生化学反应导致煤中矿物组成、水质和渗透率发生变化。
The influence of physical and chemical reactions on the reservoir characteristics after CO2 injection into coal seam under high temperature and pressure was revealed experimentally. The physical effect of CO_2 and coal will change the strain and permeability of coal. With the increase of CO_2 injection pressure, the volumetric strain increases, and the confining pressure suppresses the strain of coal. At the confining pressure of 12 MPa, the permeability of coal and rock first decreases After the increase, confining pressure of 12 MPa and 16 MPa, the permeability decreases and then decreases. Chemical reactions between CO_2 and calcite and K-feldspar in coal lead to changes in mineral composition, water quality and permeability in coal.