地压型热储流体尾水回灌化学堵塞机理研究——以咸阳回灌一号井为例  

Study on the mechanism of chemical clog for the recharging of geopressured thermal water——taking the recharging well No.1 in Xianyang as the example

作　　者：徐国芳[1] 马致远[1] 周鑫[1] 席临平[1] 孙彩霞 

机构地区：[1]长安大学环境科学与工程学院,西安710054 [2]陕西绿色能源地热发展有限公司,陕西咸阳712000

出　　处：《工程勘察》2013年第7期40-44,49,共6页Geotechnical Investigation & Surveying

基　　金：国家自然科学基金(41172211);陕西省自然科学基础研究计划重点项目(2012JZ5001)

摘　　要：本文以水文地球化学理论模拟与室内堵塞模拟实验耦合的方法,结合研究区热储环境特征,以咸阳一号回灌井为例,对地压型热储流体回灌的化学堵塞进行了系统研究。模拟结果显示,除了颗粒运移因素以外,咸阳一号井化学堵塞影响为主要致堵因素,其堵塞率占总堵塞率的38.2%;主要结垢矿物为方解石、天青石、硅类矿物及铁类矿物;随着温度的升高化学堵塞量增大。当尾水和原水在6∶4混合时形成冷锋面,化学沉淀量达到最大。化学堵塞研究结果将为地热流体回灌的研究提供科学依据。The mechanism of the chemical clog for the recharging of the geopressured thermal water is systematically studied. The hydrogeochemical theoretical simulation and the lab simulation experiment methods are coupled to study the regularity for the chemical clog with the geothermal water recharging process. The simulation results show that： Firstly, the chemical clog is the significant influence factor as well as the particles migration, and the clog rate is about 38.2% of the total clog ratio. Secondly, the main precipitation minerals such as calcite, celestite, iron minerals and silicate minerals are produced in the chemical reaction process, and the precipitation increases with the rise of the temperature in the chemical reaction, and the calcite becomes the dominated precipitation mineral. At the same time, it is found that the precipitation amount will achieve the maximum when the cold front face forms in the mixture rate 6：4 with the recharging geothermal water and the raw water. The achievement will provide the theoretical basis for the study on the recharging chemical clog of the geopressured thermal water.

关 键 词：地压型热储流体 回灌 化学堵塞 

分 类 号：P641.25[天文地球—地质矿产勘探]