精彩书摘:
The cooling of produced geothermal fluid caused by injection of colder fluid has beenreported in a few high-enthalpy geothermal fields. For low-enthalpy geothermal fields, therehas not been any such report, even in the cases where the distance between the productionwell and injection well is rather small.Therefore, it may be concluded that forproduction-reinjection doublets in low-enthalpy geothermal fields, one does not have to fearabout the cooling of the production water, if the distance between production well andinjection well is greater than a few hundred meters, and the amount of reinjection in not veryhuge. In designing the distance of reinjection and production wells of a doublet system, a fewfactors should be considered, including the type of geothermal reservoir, the geologicalstructure of the geothermal field, the permeability and thickness of the reservoir, the directionof fluid flow, the temperature difference between the reservoir and reinjection water, the flowrate of reinjection etc. But in the cases that a large number of reinjection wells and productionwells will be placed among a rather small area, care has to be taken, and proper tests have tobe carried out and proper modeling has to be done before any such injection project is started,so as to avoid premature thermal breakthrough.
5.2 Tracer test
Tracer breakthrough can be a very good precaution for thermal breakthrough. Tracertesting is one of the most important aspects of geothermal reinjection, which has become aroutine for reinjection experiments. Tracer tests can provide information about the flow pathsand the flow velocity of the geothermal fluids between the injection and production wells. Forfractured reservoirs, the volume of the aperture can be deduced from the tests. Thisinformation can be used to predict the cooling due to reinjection (Axelsson and Stefnsson,1999). For reinjection projects that are large-scale or a number of production and reinjectionwells in a relatively small area, it is strongly proposed that a tracer test be carried out.
5.3 Monitoring
Monitoring is one of the most important elements for geothermal management. For ageothermal field with reinjection, a proper monitoring program is even more important.Besides the monitoring of reservoir pressure, temperature, amount of production, chemicalcomposition of geothermal fluid etc, the water level in the injection wells, temperature ofinjection water, amount of injection and chemical composition of injection water should alsobe monitored. The purpose is to find out the changes of the geothermal system caused byreinjection, especially the cooling of the produced geothermal water.
内容简介:
《中国-澳大利亚含水层补给管理新进展》精选了中国一澳大利亚含水层补给管理研讨会论文,其主要内容包括可管理含水层补给的地址的选择、设计,有关水力学知识,地球化学特征及水质变化,风险评估,数学模型及模拟、指南,中国和澳大利亚有关可管理含水层补给的案例研究等。
《中国-澳大利亚含水层补给管理新进展》适合从事地下水科研、教学、管理及相关部门人员参考使用。
目录:
Preface
前言
中方论文
Reinjection of Geothermal Water in Beijng and Tianjin Areas of China
Study on Quality Change of Roof Rainwater and Sand Filter Column Effect
Groundwater Recharge with Municipal Effluent in China
山东省地下水开采存在问题与对策
济南泉域回灌补源潜力研究
王河地下水库水资源分析及工程建设状况
某炼油厂地下水系统石油烃污染物运移预测研究
基于ANN与GIS的含水层石油烃污染防污性能研究——以某炼油厂岩溶裂隙水系统为例
城市屋面雨水水质及处理方法探讨
澳方论文(英文版)
1 Introduction to Managed Aquifer Recharge
2 How to Establish a MAR Project Using a Risk Assessment Framework
3 Hydraulic Considerations
4 Water Quality Considerations
Appendix
澳方论文(中文版)
1可管理的含水层补给介绍
2 怎样用风险评估框架构建MAR项目
3 水力因素
4 水质因素
附录
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