Heat Extraction Evaluation of SC-CO2 Enhanced Geothermal System in Multi-Lateral Horizontal Wells
To improve the efficiency of dry hot rock development,a multi-branch horizontal well SC-CO2 enhanced geothermal development system is proposed.Effects of branch arrangement,branch number,branch length,branch angle and branch spacing on the system productivity is explored.The results show that production temperature and heat extraction rate of the branch horizontal well system are 3.89％and 11.89％higher than those of the single horizontal system respectively.The production temperature and thermal extraction rate of fishbone horizontal well are the highest among the four branch arrangements.With the increasing of branches in horizontal wells,the production temperature and heat extraction rate becomes higher.Effect of branch length on the system is mainly in the late stage of mining.The longer the branch length is,the lower the production temperature is,and the greater the thermal extraction rate is.Increasing the branch length can prolong the system's stable operation time.The larger the branch angle is,the higher the production temperature and heat extraction rate is,and it is conducive to extending the service time of the system.The heat extraction rate decreases with the increasing of branch spacing.The production temperature decreases with the increasing of branch spacing before 37.5 years,and that increases with the increasing of branch spacing after 37.5 years.
hot dry rockenhanced geothermal systemmulti-branch horizontal wellSC-CO2heat extraction rate
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