Mid-deep high-efficiency heat exchange geothermal well system

Abstract

The invention belongs to the technical field of geothermal wells and geothermal energy utilization, in particular to a geothermal well system with high-efficiency heat exchange in medium and deep layers, including an aboveground heat exchange system and an underground heat exchange system. The underground heat exchange system is composed of pipelines, underground wells and heat storage layers. A casing is installed inside, and the heat storage layer is composed of a sandstone aquifer and a mudstone layer. On the outer wall of the pipeline, a connecting pipe body is integrally formed near the sandstone aquifer. Through the augmented design of the connecting pipe body and the connecting rod block , The heat transfer effect of the dense arrangement of the connecting blocks increases the contact surface and effectively improves the heat exchange efficiency between the pipes and the heat storage layer in the internal section of the underground heat exchange system. Using the first splint and the second splint The connection and fixation under the action of the fixing parts enhances the reliability of the connection between the pipeline and the well. At the same time, through the installation of the No. 2 installation plate on both sides and the reverse monitoring component on the fixed plate, the operation of the pipeline in the underground heat exchange system can be monitored. real time monitoring.

Description

technical field [0001] The invention belongs to the technical field of geothermal wells and utilization of geothermal energy, and in particular relates to a geothermal well system with high-efficiency heat exchange in middle and deep layers. Background technique [0002] Compared with other energy sources, geothermal water heating has the special advantages of saving fossil fuels and not causing urban air pollution. As an alternative new energy source, its development and utilization are being paid attention to. There are two types of direct utilization and indirect utilization: direct utilization is to introduce geothermal water directly into the heat user system; indirect utilization is to heat the secondary water with geothermal water through a surface heat exchanger, and the secondary water enters the heat user system for circulation Heat supply. In recent years, a concentric shaft single-well heat exchange technology has emerged in the industry. The main problem is that...

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Problems solved by technology

[0002] Compared with other energy sources, geothermal water heating has the special advantages of saving fossil fuels and not causing urban air pollution. As an alternative new energy source, its development and utilization are being paid attention to. There are two types of direct utilization and indirect utilization: direct utilization is to introduce geothermal water directly into the heat user system; indirect utilization is to heat the secondary water with geothermal water through a surface heat exchanger, and the secondary water enters the heat user system for circulation Heat supply. In recent years, a concentric shaft single-well heat exchange technology has emerged in the industry. The main problem is that the heat exchange efficiency is low. Among the current technical means, the announcement number: CN209706377U discloses the high-efficiency heat exchange in the middle and deep layers The geothermal well system has improved the above problems, but there are still some problems. During the use of the existing medium-deep layer high-efficiency heat exchange geothermal well system, due to the limited contact surface between the pipe and the heat exchange layer when exchanging heat in the underground system, As a result, the heat exchange efficiency is still poor; and there is no better fixed connection form for the pipelines in the underground system, and the stabilization effect is not good; at the same time, it is impossible to monitor the situation in the underground system in real time, and the safety is low. To a certain extent, Reduced the application effect of the high-efficiency heat exchange geothermal well system in the middle and deep layers

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