Mechanism of Enhanced Gas Recovery in Shale Gas Reservoirs Based on Competitive Adsorption

doi:10.7657/XJPG20210215

Abstract

Abstract:

In order to study the mechanism of injecting CO₂ to increase the recovery of shale gas reservoirs and determine reasonable injection parameters, the experimental results of the production of shale gas reservoir developed by natural pressure drop and by injecting CO₂ at different pressure and rates were compared based on shale adsorption and desorption experiments, and the changes in CH₄ production rate and recovery factor under the two methods were studied. The results show that under the same experimental conditions, as to adsorption capacity, CO₂ is the strongest, followed by CH₄, and then N₂, while as to desorption capacity, N₂ is the strongest, followed by CH₄, and then CO₂. Compared with the isothermal adsorption curves, the isothermal desorption curves of the three kinds of gas are hysteretic to a certain extent, and the hysteresis of CO₂ is the most obvious. The recovery factor of shale reservoirs developed by natural pressure drop is low, while CO₂ injection can effectively increase the production rate of CH₄, greatly prolong stable production and increase cumulative gas production. Within certain ranges of injection pressure and injection rate, the CH₄ recovery increases with the increase of CO₂ injection pressure and injection rate, but the increment varies with core porosity and permeability.

Key words: shale gas reservoir, competitive adsorption, CO₂ flooding, adsorption capacity, desorption capacity, parameter optimization, enhanced gas recovery

CLC Number:

TE311

SUN Ying, SUN Renyuan, LIU Xiaoqiang, LI Shuxia. Mechanism of Enhanced Gas Recovery in Shale Gas Reservoirs Based on Competitive Adsorption[J]. Xinjiang Petroleum Geology, 2021, 42(2): 224-231.

Figures/Tables 9

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