渗透率各向异性对CAESA系统季节性运行性能的影响  

The effects of permeability anisotropy on the seasonal operating performance of CAESA systems

作　　者：罗贤 李毅[1,2] 喻浩 周骞 刘银江[1] LUO Xian;LI Yi;YU Hao;ZHOU Qian;LIU Yinjiang(School of Hydraulic and Environmental Engineering,Changsha University of Science&Technology,Changsha 410114,China;Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hunan Province,Changsha 410114,China)

机构地区：[1]长沙理工大学水利与环境工程学院,湖南长沙410114 [2]水沙科学与水灾害防治湖南省重点实验室,湖南长沙410114

出　　处：《长沙理工大学学报（自然科学版）》2024年第2期42-55,共14页Journal of Changsha University of Science and Technology:Natural Science

基　　金：国家自然科学基金面上项目(52179095,52378323);湖南省青年科技人才项目(2022RC1177);湖南省科技人才托举工程项目(2022TJ-N09);湖南省教育厅重点项目(22A0218);湖南省自然科学基金资助项目(2023JJ30027);湖南省地质局科研项目(HNGSTP202322)。

摘　　要：【目的】储层岩石渗透率通常呈各向异性分布,探究储层岩石渗透率各向异性对含水层压缩空气储能(compressed air energy storage in aquifers,CAESA)系统季节性运行性能的影响。【方法】建立CAESA系统概念模型和三维井群-储库数值模型,拟定3种储层渗透率各向异性分布方案,运用T2WELL/EOS3数值模拟软件,研究CAESA系统在季节性运行模式和渗透率各向异性条件下的流体传质和传热过程。【结果】储层渗透率各向异性会影响井筒-储层中的气相运移、流体交互和温压传递过程,进而影响系统的储能效率;当渗透率横纵比从2.0升高至10.0时,井筒的最大压力降低2.79 MPa,抽采阶段井口的最高温度升高2.06℃,井口两相流现象出现的时间从系统运行第435 d提前至第410 d,系统储能效率从89.8%降低至60.1%。【结论】对于渗透率各向异性程度较高的储层,可以通过增加初始气囊注入量或在后期进行补气来增加系统支撑压力,还可以采用注浆等工程手段,建立人造低渗边界以优化储层条件,提升系统储能效率。[Purposes]The permeability of reservoir rocks is usually anisotropically distributed,and it is necessary to explore its impact on the seasonal operating performance of compressed air energy storage in aquifers(CAESA)systems.[Methods]By establishing the conceptual model of the CAESA system and the 3D well group-reservoir numerical grid,three reservoir permeability anisotropic distribution cases were set.Then,the fluid mass transfer and heat transfer processes of the CAESA system under seasonal cycle operating mode and permeability anisotropic distribution conditions were particularly studied by using the numerical simulation program T2WELL/EOS3.[Findings]The permeability anisotropy of the reservoir affects the gas phase migration,fluid interaction,temperature and pressure transfer process in the wellbore-reservoir,and then affects the energy storage efficiency of the system.The ratio of transverse permeability to longitudinal permeability increases from 2.0 to 10.0.The maximum pressure of the wellbore decreased by 2.79 MPa,and the maximum temperature of the wellhead during the production stage increased by 2.06°C.The occurrence time of two-phase flow at the wellhead has been advanced from the 435th day of system operation to the 410th day,and the system energy storage efficiency decreased from 89.8%to 60.1%.[Conclusions]For reservoirs with high permeability anisotropy,the system support pressure can be increased by increasing the initial airbag injection volume or supplementing air in the later stage,or by using engineering methods such as grouting modification and establishing artificial low-permeability boundaries to optimize reservoir conditions and improve system energy storage efficiency.

关 键 词：压缩空气储能 各向异性 渗透率 含水层 季节性循环 数值模拟 

分 类 号：TK02[动力工程及工程热物理]