Research progress of enhanced coalbed methane exploitation by carbon dioxide injection

Abstract

In order to provide a comprehensive reference for the study of carbon dioxide displacement of coalbed methane, this paper explores the influence of different influencing factors on coal adsorption capacity, analyzes the gas migration and adsorption principle in coal bed, as well as the difference and relationship between different adsorption models, and introduces the pilot test and application of CO2-enhanced coalbed methane recovery in different countries. Using VOSviewer software and CNKI metrological visualization analysis function, this paper analyzes the annual publication trend and keyword time trend of CO2-ECBM related literature in CNKI and Web of Science databases, and discusses the problems existing in CO2-ECBM. The results show that coal rank and pore structure, temperature and pressure, moisture content and other factors can affect coal adsorption capacity in different forms. Gas migration in coal seam is a complex system composed of adsorption/desorption-diffusion-seepage. The best adsorption model should be considered in studying coal adsorption gas. Based on VOSviewer analysis, CO2-ECBM research is a hot topic in China. The research direction has gradually shifted from macroscopic geological storage evaluation to reveal the mechanism of coal storage and displacement gas from microscopic or molecular levels such as pore structure and composition of coal, and multi-field coupling simulation of CO2-ECBM.

Keywords

• coalbed methane exploitation
• co2-enhanced coalbed methane recovery（co2-ecbm）
• recovery ratio
• adsorption model
• vosviewer