摘要
注入二氧化碳开采煤层气技术(ECBM)既可以提高煤层气采收率,又可以封存二氧化碳,减少温室效应,因此对CO_2置换CH_4采出率和影响因素的研究已成为当下热点。文章通过在同一围压下,不同注入压力条件下注CO_2置换CH_4试验,研究注入压力对CO_2置换效果的影响。研究表明:随着注入压力的增加,煤层对CO_2和CH_4的吸附量增加,混合气体总吸附量也随之增大;由于CO_2气体在煤表面吸附位的激励竞争上优于CH_4,使得CH_4的解吸量随着压力升高而增大;随着压力的增加,CH_4的产出率和置换比都呈下降趋势,压力与两者的关系呈负相关,表明在一定范围内,低注入压力状态下的CH_4产出率更好,低压状态下的置换效果更好。
Since the ECBM technology can not only improve the recovery of coalbed methane but also achieve the goal of reducing greenhouse effect by storage of CO 2,study of the production rate and the influencing factors of CH 4 displacement by CO 2 has become a very hot point for researchers.In this paper,the effect of pressure injection on the displacement performance of CO 2 was studied by displacing CH 4 with CO 2 under different pressure injection conditions but at the same confining pressure.The results demonstrated that with the increase of pressure injection,the coalbed adsorption capacity of CO 2 and CH 4 increased and so was the total adsorption capacity of the mixture.Because CO 2 was superior to CH 4 in the incentive competition of coal surface adsorption,the desorption capacity of CH 4 increased with the increase of pressure.Productivity rate and displacement ratio of CH 4 appeared to decrease with the increase of pressure and consequently were negatively correlated with pressure,indicating that within a certain range,lower injection pressure could result in a higher CH 4 productivity and better displacement effect than those with a higher injection pressure.
作者
白云云
张永成
Bai Yunyun;Zhang Yongcheng(School of Chemistry and Chemical Engineering,Yulin College,Yulin 719000,China;State Key Laboratory of Coal and CBM Co-mining,Jincheng 048000,China)
出处
《环境保护科学》
CAS
2018年第2期71-74,共4页
Environmental Protection Science
基金
陕西省教育厅项目(16JK1889)
榆林市科技局项目(2016CXY-01)
山西省煤基重点科技攻关项目(MQ 2014-05)
关键词
温室效应
置换实验
注入压力
吸附量
产出率
Greenhouse Effect
Displacement Experiment
Pressure Injection
Adsorption Capacity
Production Rate
