Comparison of Supercritical CO2 With Water as Geofluid in Geothermal Reservoirs With Numerical Investigation Using Fully Coupled Thermo-Hydro-Geomechanical Model

Abstract In the present work, fully coupled dynamic thermo-hydro-mechanical (THM) model was employed to investigate advantage and disadvantages of supercritical CO2 (SCCO2) over water as geofluids. Low-temperature zone found in both SCCO2-enhanced geothermal system (EGS) water-EGS systems, but spatial expansion is higher water-EGS. Although, SCCO2 into rock matrix will help geo-sequestration, stress strain invaded zones were identified significantly vicinity fracture injection well. SCCO2-EGS giving better thermal breakthrough life conditions compared system. Reservoir flow impedance (RFI) heat power are examined, high Minimum RFI at 45 °C 0.05 m/s. Maximum for observed 35 °C, 20 MPa, 0.15 Therefore, developed THM having greater ability examine behavior systems effectively. The variations occur matrix, performance indicators dependent on type fluid, injection/production velocities, initial reservoir pressure, temperature. advantages provide a promising result industry geofluid.