JpGU-AGU Joint Meeting 2020

Presentation information

[J] Poster

H (Human Geosciences ) » H-SC Social Earth Sciences & Civil/Urban System Sciences

[H-SC07] CCUS (Carbon Dioxide Capture, Utilization, and Storage) for Climate Mitigation

convener:Masao Sorai(Institute for Geo-Resources and Environment, National Institute of Advanced Industrial Science and Technology), Ziqiu Xue(Research Institute of Innovative Tech for the Earth), Masaatsu Aichi(Graduate School of Frontier Sciences, University of Tokyo), Yoshihiro Konno(The University of Tokyo)

[HSC07-P04] Fiber-optic sensing for CO2-induced strain detection

*Hyuck Park1, Yankun Sun1, Yi Zhang1, Ziqiu Xue1 (1.Research Institute of Innovative Technology for the Earth)

Keywords:Fiber-optic sensing, X-ray CT imaging, CO2-induced strain, CO2 saturation

For CO2-induced strain detection, we carried out a laboratory experiment of CO2 flooding in a core scale sandstone. Single optical fiber was used as distributed fiber optic sensors in this study. X-ray CT imaging was used to measure the CO2 saturation. We compared the CO2 transfer by X-ray CT imaging and the response of the optical fiber. Sarukawa sandstone (diameter: 34.83mm, length: 179.50mm) was used in this study. It has a relatively homogeneous structure and has irregularly shaped grains and voids. Microbubble filter (diameter: 34.33mm, length: 5.02mm) was located in between distributor and core specimen in the upstream side. Porosity of the specimen determined by X-ray CT imaging is 23.38%. The permeability is about 7.3 mDarcy. The experiment was conducted under the pressure and temperature conditions that simulate underground environments; pore pressure: 10MPa, temperature: 40 degrees Celsius. The confining pressure selected in this study was 12MPa. The specimen was first saturated with KI aqueous solution (11.5 wt%). The permeability was confirmed using the KI aqueous solution. The upstream pump was prepared at 10.5 MPa for differential pressure of 0.5MPa. Optical fiber measurement and X-ray CT imaging were performed in all experimental steps. Breakthrough occurred after about 0.2PV (pore volume) CO2 injection. It took about 8 minutes in this study. The CO2 saturation obtained by the X-ray CT was about 19.58%. When comparing the front of CO2 saturation and the front of optical fiber frequency difference, they showed good agreement. This suggests that the frequency information of optical fiber can play a role as a sensor representing the behavior of CO2 in rock.