循环单井在不同水文地质条件下的运行特性

为研究含水层水文地质条件对循环单井的影响,通过大量算例模拟分析了循环单井在不同水文地质参数下的运行特性.结果表明:水平渗透系数较大的含水层提高了原水交换比,减轻了抽水温度的变化;对于渗透性能较好的含水层,含水层滞止导热系数对循环单井的影响不大,而对于渗透性能较差的含水层,抽水温度随着含水层滞止导热系数的增大而迅速提高....

Characteristics of standing column well operating at different hydro geological conditions

Standing Column Well (SCW) adopted uncased hole in bedrock, so its performance was susceptible to hydro geological conditions. The operating characteristics of SCW under different hydro geological conditions were analyzed through large numbers of calculation cases. The results showed that there were occurred the phenomena of original groundwater exchange between the borehole and aquifer and the magnitude of the original groundwater exchange ratio directly decided the change of pumping temperature of SCW. The aquifer with larger horizontal permeability coefficient greatly lightened the change of pumping temperature and enhanced the ratio of original groundwater exchange. The aquifer stagnant thermal conductivity had little effect on pumping temperature if SCW was in the aquifer with good permeability, but if with poor permeability the pumping temperature rapidly increased with the increase of the aquifer stagnant thermal conductivity. And the volumetric heat capacity had little effect on pumping temperature of SCW. Generally speaking, the heat-affected zone of aquifer was small. Thus, the well spacing for SCWs could be small, such as 15m.