Dynamic Optical Fiber Monitoring of Water-Saturated Sandstone During Supercritical CO2 Injection at Different Sequestration Pressures
In this paper, two intact cylindrical sandstones were bonded with the fiber Bragg grating sensors for laboratory experimental studying the injection and migration process of carbon dioxide (CO2) under varying temperature and sequestration pressures. A series of core flooding experiments were conducted under undrained conditions with different confining and pore pressures without changing the effective confining pressure. As a result, the strain responses of CO2 in three different states after injecting into specimen rose with the increase in the pore pressure. And the dynamic strain responses of supercritical CO2 (scCO2) was slightly higher than that of liquid CO2 due to the character of sCO2 and the effect of temperature. The initial time differences of axial strain measurement along the three gratings on a single fiber can precisely indicate the migration fronts of scCO2 plume. The difference in strain response time of the three gratings is in a descending order of liquid CO2, scCO2, and gaseous CO2.
KeywordsFiber Bragg Grating (FBG) Geologic CO2 storage Core flooding Sandstone Supercritical CO2
This work was supported by the funding of the National Natural Science Foundation of China (Grant No. 41274111).
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