Enhancing Methane Recovery with Cryogenic Liquid CO₂ Cyclic Injection: Determination of Cyclic Injection Parameters.

ABSTRACT: Carbon dioxide (CO₂) is both a primary greenhouse gas and a readily available energy source. In this study, a new underground coal permeability enhancement technique utilizing cryogenic liquid CO₂ (L-CO₂) cyclic injection is proposed. The key parameters that determine the feasibility of this technique are cycle period and cycle number within a fixed working period. The optimal value of these two parameters mainly depends on the pore structure evolution law of coal cores before and after cryogenic L-CO₂ cyclic freeze-thaw. Accordingly, nuclear magnetic resonance (NMR) was employed to study the evolution characteristics of the fracture networks and pore structures in coal cores subjected to different freeze-thaw cyclic modes. The results demonstrat

SUBMITTER: Zhang D 

PROVIDER: S-EPMC9603266 | biostudies-literature | 2022 Oct

REPOSITORIES: biostudies-literature