Discussion on recharge mode of geothermal well in Dagang District of Tianjin City

In order to discuss the effects of geothermal well recharge,taking the geothermal well in Dagang District of Tianjin City as an example,four recharge modes are adopted for experiments.The recharge capacity,possible recharge duration,accumulation recharge dynamic water level and diachronic variation of injectivity index under the four modes are analyzed.The experimental results show that the recharge duration is short and recharge capacity is poor under the mode of natural intermission;in the lifting-recharge mode,the longer the pump lifting time is,the longer the recharge duration is and the more the recharge volume is.The recharge volume under the pressure mode is decreasing.The operation mode influences the recharge capacity of the system greatly.