COMPARISON OF SUPERCRITICAL CO2 WITH WATER AS GEOFLUID IN GEOTHERMAL RESERVOIRS WITH NUMERICAL INVESTIGATION USING FULLY COUPLED THERMO-HYDRO-GEOMECHANICAL MODEL
KAUST DepartmentAli I. Al-Naimi Petroleum Engineering Research Center (ANPERC)
Computational Transport Phenomena Lab
Earth Science and Engineering Program
Energy Resources and Petroleum Engineering Program
King Abdullah University of Science and Technology (KAUST) Building #5 Thuwal, 23955-6900 Saudi Arabia
King Abdullah University of Science and Technology (KAUST), Thuwal Jeddah, 96000 Saudi Arabia
Physical Science and Engineering (PSE) Division
Permanent link to this recordhttp://hdl.handle.net/10754/681031
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AbstractIn the present work, fully coupled dynamic thermo-hydro-mechanical (THM) model was employed to investigate the advantage and disadvantages of supercritical CO2 (SCCO2) over water as geofluids. Low-temperature zone was found in both SCCO2-EGS and water-EGS systems, but spatial expansion is higher in water-EGS. Although, the spatial expansion of SCCO2 into the rock matrix will help in the geo-sequestration. The expansion of stress and strain invaded zones were identified significantly in the vicinity of fracture and injection well. SCCO2-EGS system is giving better thermal breakthrough and geothermal life conditions compared to the water-EGS system. Reservoir flow impedance (RFI) and heat power are examined, and heat power are high in the water-EGS system. Minimum RFI is found in the SCCO2-EGS system at 45°C and 0.05 m/s. Maximum heat power for SCCO2-EGS was observed at 35°C, 20 MPa, and 0.15 m/s. Therefore, the developed dynamic THM model is having greater abilities to examine behaviour of SCCO2-EGS and water-EGS systems effectively. The variations occur in the rock matrix and the performance indicators are dependent on the type of fluid, injection/production velocities, initial reservoir pressure, injection temperature. The advantages of SCCO2-EGS system over the water-EGS system, providing a promising result to the geothermal industry as geofluid.
CitationGudala, M., Govindarajan, S. K., Yan, B., & Sun, S. (2022). COMPARISON OF SUPERCRITICAL CO2 WITH WATER AS GEOFLUID IN GEOTHERMAL RESERVOIRS WITH NUMERICAL INVESTIGATION USING FULLY COUPLED THERMO-HYDRO-GEOMECHANICAL MODEL. Journal of Energy Resources Technology, 1–33. https://doi.org/10.1115/1.4055538
SponsorsManojkumar Gudala and Suresh Kumar Govindarajan gratefully acknowledge financial support from the Indian Institute of Technology–Madras; Manojkumar Gudala and Bicheng Yan thanks for the Research Funding from King Abdullah University of Science and Technology (KAUST), Saudi Arabia through the grants BAS/1/1423-01-01; Manojkumar Gudala and Shuyu Sun thanks for the Research Funding from King Abdullah University of Science and Technology (KAUST), Saudi Arabia through the grants BAS/1/1351-01-01 and URF/1/4074-01-01.