CO2驱替CH4置换效率测试与分析

为研究多因素耦合对CO2驱替CH4置换效率的影响,选取潞安集团常村煤矿煤样,利用自主研发物理模拟试验平台测定置换效率,并采用Design Expert软件设计Box-Behnken试验,构建置换效率在三因素、三水平条件下的二次回归响应曲面模型,分析了煤体含水率、注气压强及注入温度三因素耦合对置换效率的影响。结果表明:置换效率随注气压强和注入温度增大而增大,随含水率增大而减小;对置换效率影响程度为含水率>注气压强>注入温度;二次项影响程度为注气压强和注入温度>注入温度和含水率>注气压强和含水率,且注气压强和注入温度间存在交互作用,注气压强和含水率、注入温度和含水率之间无交互作用。

Test and analysis of displacement efficiency of CO2 replacing CH4

In order to study influence of multifactor coupling on displacement efficiency of CO2 replacing CH4,with coal samples from Changcun coal mine of Lu’an coal group selected as an example,displacement efficiency was measured by using independently developed physical simulation platform.Then,Box-Behnken test design was carried out with Design Expert software,and a quadratic regression response surface model of displacement efficiency was established under conditions of three factors and three levels. Finally,coupling influence of water content,gas injection pressure and injection temperature was analyzed. The results show that displacement efficiency will increase with the increase of gas injection pressure and injection temperature,and will decrease with the increase of water content. They rank as water content > gas injection pressure > injection temperature according to their influence degree,and injection pressure and injection temperature > injection temperature and water content > injection pressure and water content according to that in quadratic term. Meanwhile,there is interaction between injection pressure and injection temperature,but no interaction between any of them and water content.