Nuclear Magnetic Resonance Experiment for Enhanced Recovery of Adsorbed Methane from Shale through Carbon Dioxide Injection

doi:10.3969/j.issn.1006-6535.2023.05.015

Abstract

Abstract: It is very important to clarify the adsorption-desorption law of shale-adsorbed CH₄ under the action of CO₂ to improve the recovery of shale gas. On the basis of clarifying the pore structure of the target shale, the nuclear magnetic resonance (NMR) testing technique was introduced, the CH₄ injection and CO₂ injection adsorption-desorption experiments were carried out separately to quantitatively characterize the absolute adsorption amount of CH₄, and the influence law of CO₂ on the adsorption-desorption of CH₄ in shale was investigated. The results show that CH₄ in shale occurs in three states: adsorbed state on the shale surface, unbound state in pores and free state between particles; the absolute adsorption amount of CH₄ calculated by NMR is greater than the excess adsorption amount determined by thermogravimetry; CO₂ can desorb the adsorbed CH₄ with molar fraction of 21.8%~33.2%; the adsorbed CH₄ will remain in the pores as unbound state after desorption, but cannot escape from the pore space as free state; while CO₂ is injected to improve the recovery of adsorbed gas, the secondary hydraulic fracturing or CO₂ dry fracturing technology shall be adopted to improve the conversion efficiency of unbound state CH₄ to free state. The research results can provide reference for improving the recovery of shale-adsorbed CH₄.

Key words: shale, CO₂, adsorption-desorption, adsorbed CH₄, nuclear magnetic resonance

CLC Number:

TE348

Zhang Tianjin, Wang Yanfeng, Li Jun, Yuan Qing. Nuclear Magnetic Resonance Experiment for Enhanced Recovery of Adsorbed Methane from Shale through Carbon Dioxide Injection[J]. Special Oil & Gas Reservoirs, 2023, 30(5): 113-120.

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