Phase-change-material-containing heat storage type geothermal well transformed based on waste oil well

Abstract

The utility model relates to the field of geothermal wells, and particularly discloses a phase change material-containing heat storage type geothermal well based on abandoned oil well transformation, which comprises a heat exchange unit, a sewer pipeline and a water return pipeline, a water conveying pipeline and a backflow pipeline are arranged on the heat exchange unit, the water conveying pipeline is connected with a sewer pipeline, the backflow pipeline is connected with a water return pipeline, a phase change material layer is arranged on the sewer pipeline, a heat preservation layer is arranged outside the water return pipeline, and the heat exchange unit is arranged on the ground. The sewer pipeline and the water return pipeline are arranged in the waste oil well; according to the phase-change-material-containing heat storage type geothermal well reformed based on the waste oil well, heat in the waste oil well is collected through water circulation, heat is utilized through the heat exchange unit, cold water is conveyed into the waste oil well again for heat absorption, heat utilization in the waste oil well is achieved, and energy conservation and emission reduction are achieved. Heat storage is conducted on the bottom of the waste oil well through the phase-change material, and heat transfer is facilitated.

Description

Technical Field

[0001] The utility model relates to the field of geothermal wells, in particular to a heat storage type geothermal well containing phase change materials based on the transformation of abandoned oil wells. Background Art

[0002] Geothermal wells refer to methods and devices for generating electricity using geothermal energy at a depth of about 3,500 meters or hot spring water with a water temperature greater than 30°C. Geothermal energy is divided into three categories: high temperature, medium temperature, and low temperature. Geothermal energy that is higher than 150°C and exists in the form of steam is considered high temperature geothermal energy; geothermal energy that is between 90°C and 150°C and exists in the form of a mixture of water and steam is considered medium temperature geothermal energy; geothermal energy that is higher than 25°C and lower than 90°C and exists in the form of warm water, warm water, hot water, etc. is considered low temperature geothermal energy.

[0003] There is a large amount of geothermal energy inside the existing waste gas oil wells. By transforming the waste gas oil wells into geothermal wells, the waste gas oil wells can be reused and the energy utilization rate can be improved. Therefore, a phase change material heat storage geothermal well for the transformation of abandoned oil wells is proposed. Utility Model Content

[0004] The purpose of the utility model is to provide a geothermal well containing phase change materials for heat storage based on the transformation of abandoned oil wells, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a geothermal well containing phase change material heat storage based on the transformation of abandoned oil wells, including a heat exchange unit, a sewer pipe, and a return pipe; a water supply pipe and a return pipe are arranged on the heat exchange unit, the water supply pipe is connected to the sewer pipe, and the return pipe is connected to the return pipe, a phase change material layer is arranged on the sewer pipe, an insulation layer is arranged on the outside of the return pipe, the return pipe is arranged inside the water supply pipe, the return pipe is arranged inside the sewer pipe, the phase change material layer is arranged at the bottom of the sewer pipe, the phase change material layer is arranged outside the sewer pipe and contacts with the heat source inside the abandoned oil well, the phase change material layer realizes the absorption, storage and transfer of the heat inside the waste gas oil well, and the cold water inside the sewer pipe is heated and heated by the phase change material, an insulation layer is arranged between the water supply pipe and the return pipe to avoid the heat loss inside the return pipe during the reflux process, and the insulation layer reduces the heat transfer between the return pipes.

[0006] Preferably, the heat exchange unit is arranged on the ground, and the sewer pipe and the return pipe are arranged inside the abandoned oil well. The heat exchange unit is used to collect heat from the hot water inside the return pipe, and the cooled water after collection is transported back to the waste gas oil well through the water pipe.

[0007] Preferably, the sewer pipe is divided into two parts, an upper part and an lower part. The top of the sewer pipe is connected to a water supply pipe, and the water supply pipe inputs cold water into the sewer pipe, and the cold water moves downward along the sewer pipe.

[0008] Preferably, the bottom opening of the return pipe is arranged in the sewer pipe, and the insulation layer is arranged on the top of the return pipe, so that the hot water at the bottom of the sewer pipe flows into the return pipe through the bottom opening of the return pipe.

[0009] Preferably, the heat exchange unit realizes water circulation through the water supply pipe, the sewer pipe, the return pipe and the reflux pipe, and collects the geothermal heat inside the waste gas oil well through the water circulation.

[0010] Compared with the prior art, the beneficial effects of the utility model are: the heat at the bottom of the abandoned oil well is absorbed, stored and transferred by the provided phase-changing material, the heat loss inside the return pipe is avoided by the provided insulation layer, and the water circulation of the provided water supply pipe, sewer pipe, return pipe and reflux pipe is realized to fully utilize the water resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of the utility model;

[0012] Numbers in the figure: 1, heat exchange unit; 11, water supply pipeline; 12, return pipeline; 2, sewer pipe; 21, phase change material layer; 3, return pipe; 31, insulation layer. DETAILED DESCRIPTION

[0013] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0014] In the description of the present invention, it should be noted that the terms "vertical", "up", "down", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0015] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0016] See also Figure 1 The utility model provides a technical solution: a geothermal well containing phase change material heat storage based on the transformation of abandoned oil wells, including a heat exchange unit 1, a downpipe 2, and a return pipe 3; the heat exchange unit 1 is provided with a water supply pipe 11 and a return pipe 12, the water supply pipe 11 is connected to the downpipe 2, the return pipe 12 is connected to the return pipe 3, the downpipe 2 is provided with a phase change material layer 21, the return pipe 3 is provided with an insulation layer 31, the return pipe 12 is provided inside the water supply pipe 11, and the return pipe 3 is provided with a phase change material layer 21. Inside the sewer pipe 2, the phase change material layer 21 is arranged at the bottom of the sewer pipe 2. The phase change material layer 21 is arranged outside the sewer pipe 2 and in contact with the heat source inside the abandoned oil well. The phase change material layer 21 realizes the absorption, storage and transfer of heat inside the waste gas oil well. The cold water inside the sewer pipe 2 is heated and heated by the phase change material. An insulation layer is arranged between the water supply pipe 11 and the return pipe 12 to avoid heat loss inside the return pipe 12 during the reflux process. The insulation layer reduces heat transfer between the return pipes 12.

[0017] Furthermore, the heat exchange unit 1 is set on the ground, and the sewer pipe 2 and the return pipe 3 are set inside the abandoned oil well. The heat exchange unit 1 is used to collect heat from the hot water inside the return pipe 12, and the cooled water after collection is transported back to the waste gas oil well through the water supply pipe 11.

[0018] Furthermore, the sewer pipe 2 is divided into two parts, the upper and lower parts. The top of the sewer pipe 2 is connected to the water supply pipe 11, and the water supply pipe 11 inputs cold water into the sewer pipe 2, and the cold water moves downward along with the sewer pipe 2.

[0019] Furthermore, the bottom opening of the return pipe 3 is arranged at the sewer pipe 2 , and the insulation layer 31 is arranged at the top of the return pipe 3 , so that the hot water at the bottom of the sewer pipe 2 flows into the return pipe 3 through the bottom opening of the return pipe 3 .

[0020] Furthermore, the heat exchange unit 1 realizes water circulation through the water supply pipe 11, the sewer pipe 2, the return pipe 3, and the return pipe 12, and collects the geothermal heat inside the waste gas oil well through the water circulation.

[0021] Working principle: The heat exchange unit 1 delivers cold water from the water supply pipe 11 to the inside of the sewer pipe 2, and delivers water to the bottom of the waste gas oil well through the sewer pipe 2. The phase-changing material absorbs and stores the heat inside the abandoned oil well, and the phase-changing material transfers the heat to the cold water to heat the cold water, heating the cold water into hot water, and then returns the hot water at the bottom of the sewer pipe 2 through the return pipe 3. The insulation layer 31 prevents heat loss during the return process. The return pipe 3 is connected to the return pipe 12 to transport the hot water back to the heat exchange unit 1, and the heat is utilized by the heat exchange unit 1. After the heat utilization is completed, the hot water is converted back into cold water and is input into the waste gas oil well through the water supply pipe 11 to realize water circulation.

[0022] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A geothermal well containing phase change materials for heat storage based on the transformation of abandoned oil wells, characterized by: The invention comprises a heat exchange unit (1), a sewer pipe (2), and a return pipe (3); the heat exchange unit (1) is provided with a water supply pipe (11) and a return pipe (12); the water supply pipe (11) is connected to the sewer pipe (2); the return pipe (12) is connected to the return pipe (3); a phase change material layer (21) is provided on the sewer pipe (2); a heat insulation layer (31) is provided outside the return pipe (3); the return pipe (12) is provided inside the water supply pipe (11); the return pipe (3) is provided inside the sewer pipe (2); the phase change material layer (21) is provided at the bottom of the sewer pipe (2); the phase change material layer (21) is provided outside the sewer pipe (2) and in contact with a heat source inside an abandoned oil well; and a heat insulation layer is provided between the water supply pipe (11) and the return pipe (12).

2. The phase change material heat storage geothermal well based on abandoned oil well reconstruction according to claim 1 is characterized by: The heat exchange unit (1) is arranged on the ground, and the downcomer pipe (2) and the return water pipe (3) are arranged inside the abandoned oil well.

3. The geothermal well containing phase change materials for heat storage based on abandoned oil well reconstruction according to claim 1 is characterized in that: The sewer pipe (2) is divided into two parts, an upper part and an lower part. The top of the sewer pipe (2) is connected to a water supply pipe (11). The water supply pipe (11) supplies cold water into the interior of the sewer pipe (2), and the cold water moves downward along with the sewer pipe (2).

4. The phase change material heat storage geothermal well based on abandoned oil well reconstruction according to claim 1 is characterized by: The bottom opening of the return water pipe (3) is arranged on the sewer pipe (2), and the thermal insulation layer (31) is arranged on the top of the return water pipe (3).

5. The phase change material heat storage geothermal well based on abandoned oil well reconstruction according to claim 1 is characterized by: The heat exchange unit (1) realizes water circulation through the water supply pipe (11), the sewer pipe (2), the return pipe (3), and the return pipe (12).

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