Displacement of shale gas confined in illite shale by flue gas: A molecular simulation study  

作　　者：Tong Tao Shitao Wang Yixin Qu Dapeng Cao 

机构地区：[1]State Key Laboratory of Organic-Inorganic Composites,Beijing University of Chemical Technology,Beijing 100029,China

出　　处：《Chinese Journal of Chemical Engineering》2021年第1期295-303,共9页中国化学工程学报（英文版）

摘　　要：The shale gas is an unconventional supplementary energy to traditional fossil energy,and is stored in layered rocks with low permeability and porosity,which leads to the difficulty for exploration of shale gas.Therefore,using CO_(2) gas to displace shale gas has become an important topic.In this work,we use molecular simulations to study the displacement of shale gas by flue gas rather than CO_(2),in which flue gas is modeled as a binary mixture of CO_(2) and N_(2) and the shale model is represented by inorganic Illite and organic methylnaphthalene.CH_(4) is used as a shale gas model.Compared to the pure CO_(2),flue gas is easily available and the cost of displacement by flue gas would become lower.Results indicate that the pore size of shale is an important factor in the process of displacing shale gas and simultaneously sequestrating flue gas,while the flue gas N_(2)-CO_(2) ratio shows a small effect on the process of CH_(4) displacement,because the high partial pressure of flue gas is the main driving force for displacement of shale gas.Moreover,the geological condition also has a significant effect on the process of CH_(4) displacement by flue gas.Therefore,we suggest that the burial depth of 1 km is suitable operation condition for shale gas displacement.It is expected that this work provides a useful guidance for exploitation of shale gas and sequestration of greenhouse gas.

关 键 词：Displacement of shale gas Flue gas Illite shale Organic matter Molecular simulation 

分 类 号：TE377[石油与天然气工程—油气田开发工程] X701[环境科学与工程—环境工程]