Abstract
Fracture of gas wells which is performed by the use of pressurized carbon dioxide gas results in the increase of CO, content in the well. Reduction of the CO2 in the gaseous mixture of the well is necessary before any handling or processing steps. In-situ enrichment by polymeric membrane modules proved to be extremely practical in comparison with conventional chemical separation processes. The membrane separation process is characterized by its compact size, high separation efficiency, and low energy consumption. This simulation study aims at modeling the process of gas enrichment in the well by cellulose acetate membrane modules. The developed mathematical model assumes a complete mixing flow configuration for both the module and the well, that the gas mixture contains only CH4 and CO2 with constant permeabilities, and ideal gas behaviour. Simulation results are presented in terms of time requirements to perform the enrichment process as well as the final gas composition of the well and the removal efficiency of the C02
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