含水层构造对抽灌水温变特性的影响

Effect of aquifer structure on water temperature evolution in field of pumping and injecting wells

针对不同含水层构造抽灌井群地下温度场的演化规律进行实验研究,分析相同井群抽灌量和几何参数条件下,不同含水层介质的热湿运移规律及热交互影响。研究表明:含水层岩性的变化对井场热贯通时间的影响较大,对后期的热交互影响相对略小。粒块体结构较大的砂砾含水层,其井场热贯通时间明显缩短。含水层介质的分布状态对热交互影响较大,对热贯通时间的影响有大有小。对于均匀分布含水介质,各井抽灌量应尽量均匀分配,推迟热贯通发生和减弱热交互影响。对于非均匀分布含水介质,采用各井配置流量调整,可改善热湿均衡性,避免非均匀含水介质的不利影响。

The evolution of underground temperature field of the pumping and injecting wells area with different aquifer structures was investigated experimentally. The transport behavior of the thermalwet of different aquifer media and their thermal interaction were analyzed under same total water flow rate and well geometric parameters. The experimental results showed that the effect of aquifer rockyness variation on the occurrence time of the thermal breakthrough is significant while relatively small on the later thermal interaction. For the aquifer with larger size of gravel, the thermal breakthrough advances significantly. The effect of aquifer distribution on the thermal breakthrough is less than thermal interaction. For the homogeneous aquifer medium, the water flow rate of each well should be evenly distributed to postpone the thermal breakthrough and weaker the thermal interaction. For the inhomogeneous aquifer medium, each well should have individual flow adjustment to improve the thermal-wet balance and avoid the adverse influence of aquifer in homogeneity.