论文部分内容阅读
为了得出不同煤阶煤注CO_2置换CH_4后的采收率差异,分别采集新疆长焰煤、山西潞安贫煤和晋城无烟煤进行了纯CH_4吸附/解吸、CO_2置换CH_4实验,利用多元混合气体等温吸附理论对纯甲烷解吸和CO_2置换CH_4的采收率进行了计算,探讨了储层温度、平衡压力等参数对CO_2置换CH_4采收率的影响。结果表明:与纯CH_4解吸相比,CO_2置换CH_4能显著提高其采收率。变质程度越低,CO_2置换效果越好。温度在20~40℃时,温度对CO_2置换CH_4采收率的影响较小;注入平衡压力较低时,置换效果相对更好。现场注入CO_2的量要适度,注入太少置换效果将不明显。不同煤阶煤CO_2置换CH_4提高采收率研究成果为现场注入参数优化提供了实验依据。
In order to get the difference of recovery rate of CH_4 after CO_2 replacement of CH_4 with different coal rank, pure CH_4 adsorption and desorption, CO_2 displacement CH_4 experiment were carried out in Xinjiang Longyan coal, Shanxi Luan lean coal and Jincheng anthracite respectively. Isothermal adsorption theory was used to calculate the recovery of pure methane desorption and CO_2 replacement CH_4, and the effect of parameters such as reservoir temperature and equilibrium pressure on the recovery of CO_2 replacement CH_4 was discussed. The results show that compared with pure CH 4 desorption, CO 2 replacement of CH 4 can significantly improve its recovery. The lower the degree of metamorphism, the better the CO2 replacement effect. At 20 ~ 40 ℃, the effect of temperature on the recovery of CH_4 by CO_2 substitution is small, and the substitution effect is better when the injection equilibrium pressure is lower. The amount of CO2 injected into the field should be modest, and the injection effect will not be obvious if the displacement is too little. The results of research on improving oil recovery by replacing CO_2 with CH_4 in coal with different coal rank provided the experimental basis for the optimization of field injection parameters.