Experimental study on tail water recharge of sandstone thermal storage geothermal in Zhoukou City

Abstract

The concentrated exploitation of geothermal resources and the direct discharge of tail water after utilization will cause thermal pollution and water chemical pollution of surface water sources, and even affect hydrogeological problems such as thermal storage pressure and water level drop. Zhoukou City is a concentrated area for the exploitation and utilization of thermal storage geothermal resources in the Guantao Formation. This time, a geothermal recharge experiment was carried out in Zhoukou City, which belongs to the research on the recharge of wells in the same layer. According to the data obtained from the recharge test, the relationship between the recharge amount and the recharge pressure, the influence of the recharge on the water quality of the thermal reservoir, and the effect of the recharge on the temperature of the thermal reservoir were analyzed and studied. The relationship curve calculates the maximum recharge. The analysis results show that the hourly recharge volume increases with the increase of the pressure, and the ability to increase the hourly recharge volume decreases with the increase of the recharge pressure. Therefore, the recharge has little effect on the water quality of the thermal reservoir; in this experiment, the distance between the mining and filling wells is large, so the recharge has no effect on the temperature of the thermal reservoir.