通州区地热资源优化开采模式动态研究  

DYNAMIC STUDY ON OPTIMAL EXPLOITATION MODE OF GEOTHERMAL RESOURCES IN BEIJING TONGZHOU DISTRICT

作　　者：张进平 王煜曦 刘桂宏[2] 何铁柱 袁利娟 徐浩然 孔祥军 ZHANG Jin-ping;WANG Yu-xi;LIU Gui-hong;HE Tie-zhu;YUAN Li-juan;XU Hao-ran;KONG Xiang-jun(Beijing Geothermal Research Institute,Beijing 102218,China;Department of Civil Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]北京市地热调查研究所,北京102218 [2]清华大学土木工程系,北京100084

出　　处：《工程力学》2022年第6期247-256,共10页Engineering Mechanics

基　　金：北京市通州区地热资源优化开采模式研究项目(PXM2019_158309_000005)。

摘　　要：地热井的优化开采对地热资源的集约高效利用意义重大。根据北京市通州区地层特征和地热井布局建立了三维热储模型,对储层岩体中热、水进行多尺度耦合模拟,利用抽水试验、回灌试验监测数据进行了模型校正。利用校正后的模型,计算了不同采灌量下的热突破时间,预测了现有模式下热突破引起的地温场变化以及不同采量下抽水漏斗的演化趋势,得出通州区域内25眼地热井开采100年后温度场和水位场的动态云图。基于模拟数据,结合通州区现有采灌条件,提出了“一采一灌”、“一采两灌”、“两采三灌”的布井方案,同时进行了不同采灌量下的温度场、水位场的数值模拟,提出了优化的采灌布井模式,为地热资源长期开发利用提供理论支撑。Optimal exploitation of geothermal wells is of great significance to the intensive and efficient utilization of geothermal resources. According to the stratigraphic characteristics and the distribution of geothermal wells in Beijing Tongzhou District, a three-dimensional heat storage model was established. The multi-scale coupling simulation of heat and water in reservoir rock mass was carried out, and the model was calibrated using the monitoring data of pumping test and recharge test. Using the calibrated model, the thermal breakthrough time under different exploitation and recharge rates was calculated, and the variation of geothermal field caused by thermal breakthrough under the current mode and the evolution trend of pumping funnel with different exploitation rates were predicted. The dynamic contours of temperature field and water level field of 25geothermal wells in Tongzhou area after 100 years of exploitation were predicted. Based on the above analysis and the current exploitation and recharge conditions, different well distribution plans were proposed, including "one exploitation well with one recharge well", "one exploitation well with two recharge wells" and "two exploitation wells with three recharge wells". Furthermore, numerical simulation of temperature field and water field with different exploitation and recharge flow rates were carried out, and the optimized well distribution mode was proposed, which provided a theoretical base for long-term development and utilization of geothermal resources.

关 键 词：数值模型 优化开采 多场耦合 井筒简化 热储工程 

分 类 号：TK52[动力工程及工程热物理—热能工程]