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Abstract

This collection of research explores advanced Enhanced Gas Recovery (EGR) techniques across diverse geological settings. Studies investigate the efficacy of supercritical carbon dioxide (scCO2) and nitrogen (N2) injection in shale gas, low-permeability, and tight gas reservoirs, focusing on mechanisms like diffusion, desorption, and adsorption. Hybrid methods combining steam and CO2 are examined for heavy oil, while miscible hydrocarbon gas injection is evaluated for gas condensate reservoirs. Coalbed methane recovery using nitrogen is also detailed. Collectively, these works highlight strategies for optimizing hydrocarbon extraction through enhanced fluid-rock interactions and improved sweep efficiencies, with some methods offering dual benefits like carbon sequestration.