开封地区砂岩孔隙热储回灌化学堵塞数值模拟研究  

NUMERICAL SIMULATION STUDY OF CHEMICAL CLOGGING OF SANDSTONE PORE THERMAL RESERVOIRS RESERVOIR BACKFILL IN KAIFENG AREA

作　　者：黄艳艳 那金 雷宏武[2] Huang Yanyan;Na Jin;Lei Hongwu(College of Resources and Environment,Yangtze University,Wuhan 430100,China;State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China)

机构地区：[1]长江大学资源与环境学院,武汉430100 [2]岩土力学和工程国家重点实验室,中国科学院武汉岩土力学研究所,武汉430071

出　　处：《太阳能学报》2024年第2期225-235,共11页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金(41807194,41807208)。

摘　　要：以开封圳宇花园的地热开发过程为研究对象,利用TOUGHREACT程序构建三维砂岩孔隙热储层的温度场-化学场-渗流场多场耦合模型,并对主要影响因素进行敏感性分析,探究地热回灌过程对热储层化学堵塞过程的影响。热储层中方解石、石英、伊利石、钙-蒙脱石、二氧化硅矿物沉淀,钾长石、钠长石和白云石矿物溶解,其中方解石矿物为主要沉淀矿物,堵塞回灌井热储层,导致孔隙度降低约10%。回灌过程中回灌水注入流速、温度、井间距的改变影响地热水回灌过程中方解石沉淀,从而导致热储层孔隙度变化。Taking the geothermal development process of Kaifeng Zhenyu Garden as the study object,a three-dimensional sandstone pore thermal reservoir multi-field coupling model of temperature field-chemical field-seepage field was constructed using the TOUGHREACT program,accompanied by the sensitivity analysis of the main influencing factors to investigate the influence of the geothermal reinjection process on the chemical plugging process of the geothermal reservoir.In the thermal reservoir,the minerals such as calcite,quartz,illite,calcium-montmorillonite,and silica dioxide will precipitate.However,the minerals like potassium feldspar,sodium feldspar,and dolomite will dissolve in the geothermal reservoir.Among them,calcite is the main precipitated minerals,which may block the geothermal reservoir of backfill wells,resulting in a porosity reduction of about 10%.The changes of backfill water injection flow rate,temperature,and well spacing during the backfill process affect the precipitation of calcite in the backfill process of geothermal water,thus lead to variation in the porosity of the geothermal reservoir.

关 键 词：地热井 方解石 孔隙度 化学堵塞 THC耦合 TOUGHREACT程序 

分 类 号：P314.9[天文地球—固体地球物理学]