咸阳地区地热采灌井最佳井距分析

咸阳地区地热采灌井最佳井距分析
党书生;马致远;郑磊
【期刊名称】《地下水》
【年(卷),期】2016(0)1
【摘要】采灌井合理井间距的确定是对井采灌,资源可持续利用的关键性问题[1].采灌井间距过大,不利于发生水力联系,间距过小容易产生"热突破"[2].对采灌井合理井间距的确定提供依据,以咸阳采灌区为例,在建立地下水流场和温度场耦合数学模型的基础上,借助 Feflow软件以咸阳地区 WH2 为回灌井中心,开采井呈东西南北向排布的方式模拟.模拟分析表明:在采灌过程中地下水水位稳定时间随抽、灌水量的增加相应减少.水流连通的时间缩短,主要是由于抽、灌水共同作用下,地下水发生强迫对流作用加强,使天然流场的作用被忽略.在强迫对流作用的影响下,经过一定的时间形成新的渗流稳定场,当新的渗流稳定场形成之后,水流连通也将出现.以回灌使含水层下降2 ℃视为出现"热突破"现象,运行3 650 天时,在防止抽灌井发生"热突破"的前提下,抽水井距灌水井合理的间距的下限为400 m左右.结合水力联系影响下的合理井距上限500 m,得出的研究区采灌井间合理的井间距范围为400 ~500 m.%The confirmation of optimum distance among fluid extracting and injecting wells is the key problem for the reali-zation of water extracting and injecting and the sustainable utilization of resources. The too huge distance among wells goes a-gainst the occurrence of hydraulic connection,while the too small distance easily causes"thermal breakthrough". Aiming to provide supports for the confirmation of optimum distance among fluid extracting and injecting wells,the
simulation was con-ducted by taking irrigation area of Xianyang as the example and the inverted well of WH2 in Xianyang as the center with the aid of Feflow software based on the establishment of groundwater flow field and temperature field coupling mathematical model, and the exploited well showed as EWSN configuration. The model analysis showed that:the stabilization time of groundwater level during the extracting and injecting process reduced accordingly along with the increasing pumping and injecting amount. The water connection time shortened mainly due to the increasing forced convection happened in the underground water under the combined action of pumping and irrigating,thus the function of natural flow field was neglected. Under the influence of forced convection,a new steady seepage field was formed followed by the appearance of hydraulic connection. Taking the de-clined 2℃ of aquifer caused by the recharge as the"thermal breakthrough"phenomenon,and operating for 3650 days,the optimum distance between pumping well and injecting well was about 400m under the premise of avoiding the happening of"thermal breakthrough"in pumping and injecting wells. Combined with the upper limit 500m of optimum distance under the influence of hydraulic connection,the optimum distance scope among fluid extracting and injecting wells was 400 -500m in the research area. ld,it provides basis for the determination of reasonable well spacing by using Feflow.
【总页数】3页(P56-58)
【作者】党书生;马致远;郑磊
【作者单位】长安大学环境科学与工程学院,陕西西安 710054;长安大学环境科学与工程学院,陕西西安 710054;长安大学环境科学与工程学院,陕西西安710054
【正文语种】中文
【中图分类】P314.1
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