Nano structure characterization and Sorption Kinetics of gases in Indian Coals

This work is a systematic attempt employed to investigate gas production by estimating the gas kinetics and evaluating pore structural characteristics, sorption kinetics and morphology which are efficient in creating a design of coal reservoir and useful in predicting the reservoir potential and CO2 sequestration potential for enhanced recovery of CBM for coal fields. Experimental sorption studies were carried out on coal samples for adsorption and desorption at reservoir pressures, followed by unipore diffusion model, adopting kinetic parameter. Impact of various pressures and pore properties was investigated for establishing uniqueness in describing gas transport mechanism. Observations include adsorption isotherms, Langmuir relation, and critical pressure for gas to diffuse from the coal matrix and gas recovery performance of coal reservoir by studying kinetics of gases. It is therefore concluded that the practical implication of the investigation for the pressures that are typically encountered in the Jharia coalfields, is a positive finding for the concomitant recovery of CBM with CO2 sequestration. Additionally, comparison of sorption and diffusion results reveals that diffusivity depends on the pore structure and pore size distribution exhibiting a positive relationship with pressure variation.