Medium-depth geothermal composite center heat preservation heat exchange pipe and heat exchange system

By using the insulated heat exchange pipes and heat exchange system of the medium-deep geothermal composite center, and adopting a coaxial sleeve closed structure and gradient insulation design, the reverse heat exchange loss and operation and maintenance problems in the development of medium-deep geothermal energy are solved, achieving efficient heat insulation and online operation and maintenance, and improving the overall performance and reliability of the system.

CN122429490APending Publication Date: 2026-07-21SHAANXI LVDONG RUIHENG TECHNOLOGY DEVELOPMENT CO LTD
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Patent Information

Application Number
CN202610880633.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-06-17
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

Existing coaxial casing heat exchange systems suffer from problems such as large reverse heat exchange losses, low wellhead water temperature, material waste, and excessive costs in medium-deep geothermal development. Furthermore, they lack downhole online operation and maintenance capabilities, leading to long-term operational efficiency degradation.

Method used

It adopts a medium-deep geothermal composite central insulation heat exchange pipe and heat exchange system. Through the coaxial sleeve-type closed structure of the outer and inner pipes, combined with the gradient distribution of insulation pipes and multi-functional operation and maintenance device, it can achieve precise insulation and online operation and maintenance on demand. It integrates pressure bearing and heat exchange functions, eliminates the thermal resistance of the air gap between the sleeves, and enhances the insulation effect and operation and maintenance efficiency.

Benefits of technology

It significantly improves system heat exchange efficiency, reduces the amount of insulation material used and manufacturing costs, extends service life, ensures system reliability and environmental friendliness, and solves the heat exchange loss and operation and maintenance problems of traditional systems.

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Abstract

The application relates to the technical field of geothermal energy development and utilization equipment, and particularly discloses a middle-deep geothermal composite center heat preservation and heat exchange pipe and a heat exchange system, which comprises the following: an outer pipe, which is a pressure-bearing heat exchange integrated steel pipe structure and is closed at the bottom; the outer wall of the outer pipe is directly contacted with a stratum to absorb geothermal energy; an inner pipe is coaxially arranged in the inner portion of the outer pipe and is spaced apart from the inner bottom surface of the outer pipe at the bottom; an annular flow channel for heat exchange fluid is formed between the inner wall of the outer pipe and the outer wall of the inner pipe; a heat insulation pipe is made of heat insulation and corrosion-proof material and is tightly covered or sleeved on the outer wall of the inner pipe; the heat insulation and corrosion-proof material is any one of PPR and PERT; and the inner pipe and the outer pipe are both made of N80-grade seamless steel pipe special for petroleum. The application realizes precise heat insulation on demand, significantly improves the heat exchange efficiency of the system, and greatly reduces the use amount and manufacturing cost of heat insulation materials.
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