Optimized geothermal energy extraction from hot dry rocks using a horizontal well with different exploitation schemes

Abstract In the foreseeable future, geothermal exploitation from hot dry rocks (HDR) using a horizontal well will bear potential. Thus, in-depth studies should be conducted on selection of injection-production scheme (IPS) and working fluid, design reinjection parameters, optimization wellbore structure materials, analysis geological settings. This paper proposed fully coupled model to study above scientific questions. For Model A, fluid was injected into annulus then flowed out thermal insulation pipe (TIP). Its temperature passes through two stages rise decline. But for B, TIP annulus. undergoes five stages, four one stage The results show that A is best IPS owing its high outlet temperature, stable recovery, low injection volume. when supercritical carbon dioxide liquid volume 135.73 m 3 /d, heat recovery ratio (HRR) as 85.40%, which 17.85% higher than B whose medium water, only 25% that. Meanwhile, over ten years continuous production, decreased by 7.5 °C 18.38 in latter. optimal has capacity conductivity any IPS. Sensitivity showed area met HDR standard, effect can ignored. As HRR drops sharply 6.74–9.32% goes completely adiabatic nonzero conductivity. segment length shorter obtains compared with B. addition, correlation between different formations thermophysical properties seriously affected period, summarized detail.