地热连通井热交换隔离开采技术研究综述

Review of research on isolated heat exchange technology with connected geothermal

摘要:

近些年，随着地热资源不断开发和利用，无论是单井开采还是定向井和直井结合开采，由于井筒和地层没有实现完全封隔，注水开采地热过程中，注入的地表水跟地下水将产生交换，导致地下水资源的污染以及大量尾水带来的环保隐患。尤其随着城市大量地热资源的开发，这一问题将显得尤为突出。本技术研究将通过地热连通井热交换隔离开采技术的设计与实施，分析地热连通井的热交换效率和井筒与地层的封隔技术手段，建立一套热交换隔离开采技术方法，实现地热井开采过程中取热不取水，为城市周边地热资源的开发提供基础数据和技术支撑。

Abstract:

In recent years, geothermal resources have seen continuous development and utilization. With either single well recovery orrecovery by the well set ofa directional well connected with a vertical well, injected surface water and groundwater will exchange in the process of water injection exploitation of geothermal resources, resulting in the pollution of groundwater resources and a large number of environmental hazards brought by tail water since the well bore and the stratum are not completely isolated. It is specially true with the large scale development of geothermal resources in the city. Through the design and implementation of isolated heat exchange technology with connected geothermal wells, this paper analyzes the heat exchange efficiency of connected geothermal wells and the sealing measures between the well bore and the stratum to establish a set of isolated heat exchange and recovery methods, so that heat can be extracted without taking out ground water in the process of geothermal well recovery; thus providingbasic data and technical support for the development of geothermal resources around the city.