Abstract
AbstractIn the past two decades, research on CO2 storage in coal seams and simultaneously enhanced coalbed methane recovery (ECBM) has attracted a lot of attention due to its win–win effect between greenhouse gas (CO2) emission reduction and coalbed methane recovery enhancement. This paper presents an overview on the current status of research on CO2-ECBM in the past two decades, which involves CO2 storage capacity evaluations, laboratory investigations, modelings and pilot tests. The current status shows that we have made great progress in the ECBM technology study, especially in the understanding of the ECBM mechanisms. However, there still have many technical challenges, such as the definition of unmineable coal seams for CO2 storage capacity evaluation and storage site characterization, methods for CO2 injectivity enhancement, etc. The low injectivity of coal seams and injectivity loss with CO2 injection are the major technique challenges of ECBM. We also search several ways to promote the advancement of ECBM technology in the present stage, such as integrating ECBM with hydraulic fracturing, using a gas mixture instead of pure CO2 for injection into coal seams and the application of ECBM to underground coal mines.
Highlights
Carbon dioxide (CO2) is one of the main greenhouse gases which cause the global warming
We firstly present an overview of the current status of research on CO2-enhanced coalbed methane recovery (ECBM) in the past two decades, which involves CO2 storage capacity evaluations, laboratory investigations, modelings and pilot tests; some technical challenges of CO2-ECBM are described; we search several ways to promote the development of ECBM technology in the present stage
CO2 storage in coal seams and enhanced coalbed methane recovery (CO2-ECBM), one of the CO2 geological utilization and storage (CGUS) options, has been paid special attention in the past two decades due to its win– win effect on simultaneously storing large volumes of CO2 in unmineable coal seams permanently and enhancing coalbed methane recovery ratio, which can offset some of the costs associated with CO2 storage
Summary
Carbon dioxide (CO2) is one of the main greenhouse gases which cause the global warming. Mitigation and controlling CO2 emission are critical to address the greenhouse effect. CO2 geological utilization and storage (CGUS) is believed to be an effective CO2 emission reduction option (Xie et al 2013). CGUS options is that the value of CH4 produced helps to alleviate partly or wholly the storage costs (Gale and Freund 2001). In the past two decades, the research on CO2-ECBM has attracted a lot of attention. We firstly present an overview of the current status of research on CO2-ECBM in the past two decades, which involves CO2 storage capacity evaluations, laboratory investigations, modelings and pilot tests; some technical challenges of CO2-ECBM are described; we search several ways to promote the development of ECBM technology in the present stage
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