Abstract

CO2 sequestration in geological formation is a promising approach for reducing the emission of anthropogenic CO2. In CCS (CO2 capture and storage) projects, understanding the permeability of supercritical CO2 in porous rock is of great significance in predicting the migration and evaluating the long-term stability of injected CO2. This paper describes a new developed device for measuring the CO2 permeability coefficient in porous rock at reservoir conditions, in which the pressure and temperature of injected CO2 are usually beyond the critical point of 7.8MPa and 31.8°. The device consists of a pressure cell, a syringe pump of CO2, a pressure amplifier, a heating unit, and a measurement system. Two buffer tanks are set at the inlet and outlet of the seepage room respectively to keep the injection and back pressures of CO2 stable during the test. The supercritical CO2 flowing through the rock sample is depressurized to gaseous phase to measure its flow rate under a lower pressure condition. An average flow rate over a period of time is used to calculate the permeability coefficient of CO2 in rock sample. An application example using a siltstone for testing proves that the device can measure the permeability coefficient of supercritical CO2 in porous rock effectively.

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