增强型地热系统开采过程中热储渗透率对温度场的影响  

Effect of reservoir permeability on temperature field in EGS mining process

作　　者：凌璐璐[1,2] 苏正[1,2] 吴能友[1,2] 

机构地区：[1]中国科学院天然气水合物研究中心,广东广州510640 [2]中国科学院广州能源研究所,广东广州510640

出　　处：《可再生能源》2015年第1期82-90,共9页Renewable Energy Resources

基　　金：国家"863"计划项目(2012AA052802);中科院广州能源所所长基金培育项目(y107a41001)

摘　　要：以西藏羊易地热田的温度信息为依据,假想激发不同渗透率的EGS热储,采用数值模拟的方法,观察开采50 a内系统温度场分布,分析热储的可持续开采能力、冷却影响范围等。共设计了9个EGS开采案例,根据模拟结果的温度场分布形状,可将模型划分为极高、高、低渗透率3种类型。结果表明,高渗透率模型在开采过程中的温度降低幅度不大,50 a后开采点温度为270℃,热储仍具有开采潜力,此案例适用于对热储可持续性和后期热恢复要求较高的地热开采;低渗透率模型在开采过程中出现了大面积低于100℃的冷却区域,模拟结束后开采点的温度基本不变,此案例适用于对地热能开采稳定性要求较高的情况;极高渗透率模型的开采寿命只有20 a。Based on temperature data of Yangyi geothermal field in Tibet, the numerical simulation method was used to observe system temperature field distribution for 50 years of mining with different hypothetical permeability of enhanced geothermal system （EGS） heat reservoir,and analyze the geothermal reservoir capacity for sustainable exploitation and cooling effects, etc. Nine EGS exploitation cases were designed, according to the simulation results of temperature field distribution, the models were divided into three types： low,high, and extra-high permeability model. The high permeability model had a lower temperature decrease of the mining area during mining process,the temperature was around 270℃ after 50 years mining, the reservoir still had mining potential, this case was suitable for high demand for reservoir sustainability and heat recovery of geothermal exploration; Low permeability model appeared a large area below 100℃ in mining process, and the mining point temperature basically remained at the end of simulation, this case was suitable for high stability requirements of geothermal energy exploitation; The mining life of extra-high permeability model was only 20 years.

关 键 词：EGS 渗透率 温度场 羊易 

分 类 号：TK529[动力工程及工程热物理—热能工程] TM616[电气工程—电力系统及自动化]