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应用耦合的煤层气数值模型,模拟和对比了3种不同的煤基质收缩和膨胀模型模拟的渗透率、CH4产量、CH4含量分布、CO2注入量和CO2存储量。在无CO2注入情况下,考虑吸附/解吸附作用的煤基质收缩/膨胀模型最大的渗透率为初始渗透率的6倍,而只考虑压力作用的煤基质收缩/膨胀模型渗透率下降2%,CH4累积产量前者是后者的1.3倍;在CO2注入情况下,考虑吸附/解吸附作用的模型最大的渗透率为原来的1.25倍,最小为原来的0.17倍,而只考虑压力作用的煤基质收缩/膨胀模型渗透率下降1.6%,CH4累积产量前者是后者的1.5倍,而CO2的注入速度和存储量后者分别是前者的14倍和3.85倍。结果表明:煤基质收缩/膨胀对CH4开采和CO2都有影响,吸附/解吸附导致的基质收缩/膨胀起主要作用。
The coupled CBM numerical model was used to simulate and compare the permeability, CH4 production, CH4 distribution, CO2 injection and CO2 storage simulated by three different coal matrix shrinkage and expansion models. In the case of CO2-free injection, the maximum permeability of the coal matrix shrinkage / expansion model considering adsorption / desorption is 6 times of the initial permeability, while the permeability of the contraction / expansion model of coal matrix considering only pressure is decreased by 2% CH4 cumulative yield of the former is the latter 1.3 times; in the case of CO2 injection, consider the model of adsorption / desorption of the maximum permeability of 1.25 times the original, the minimum of 0.17 times the original, and only consider the pressure of the coal matrix The contractile / expansive model permeability decreased by 1.6%, while the cumulative CH4 yield was 1.5 times that of the latter, while the latter was 14 times and 3.85 times higher than the former. The results show that coal matrix shrinkage / expansion has an impact on CH4 production and CO2, and matrix contraction / expansion caused by adsorption / desorption plays a major role.