A device for heating a medium-deep geothermal well

Abstract

The utility model discloses a device of medium -deep geothermal well temperature increasing belongs to geothermal resource development and utilization technical field, and the device includes geothermal well one open casing pipe, geothermal well two open casing pipe, its below geothermal well one open casing pipe, and its top stretches into geothermal well one open casing pipe, and water -taking inner tube is installed in geothermal well two open casing pipe, and its top stretches out geothermal well two open casing pipe and extends to geothermal well one open casing pipe, wherein: the water -taking inner tube lateral wall top and geothermal well two open casing pipe top between installation has sealing structure, install the water -stopping device on the water -taking inner tube. The utility model can effectively isolate and prevent low temperature water, ensure geothermal well stable and efficient operation, satisfy geothermal resource development and utilization to the requirement of water temperature, and provide strong guarantee for the sustainable development of geothermal energy.

Description

Technical Field

[0001] This utility model relates to the field of geothermal resource development and utilization technology, and in particular to an innovative device applied to medium-deep geothermal wells, specifically for sealing low-temperature aquifers. Background Technology

[0002] With the increasing demand for clean energy, the development of geothermal resources is receiving more and more attention. However, during the construction and operation of geothermal wells, a common problem is that the water temperature in the upper part of the aquifer is low, and after mixing with the high-temperature aquifer in the middle and lower parts, the overall water temperature is also low. This results in substandard water temperature and low heat output during the operation of the geothermal well after completion. Therefore, it is crucial to find simple, practical, and cost-effective ways to remedy the situation and increase the temperature of the geothermal well. Utility Model Content

[0003] The purpose of this invention is to provide a highly efficient device for heating medium-deep geothermal wells.

[0004] To solve the above-mentioned technical problems, this utility model provides a device for heating medium-deep geothermal wells, comprising:

[0005] Once the casing of a geothermal well is opened;

[0006] The second casing of the geothermal well is located below the first casing of the geothermal well, and its top extends into the first casing of the geothermal well.

[0007] The water intake inner pipe is installed inside the second casing of the geothermal well, and its top extends out of the second casing of the geothermal well and into the first casing of the geothermal well.

[0008] in:

[0009] A sealing structure is installed between the top of the side wall of the water intake inner pipe and the top of the second casing of the geothermal well.

[0010] A water-stopping device is installed on the water intake pipe.

[0011] Preferably, an annular sealing groove is provided on the top of the inner wall of the second casing of the geothermal well, and a sealing ring is installed in the sealing groove.

[0012] Preferably, an expansion rubber is installed between the second casing of the geothermal well and the inner water intake pipe;

[0013] The expanded rubber is located near the top of the inner wall of the second casing of the geothermal well;

[0014] The expanded rubber sleeve is installed on the water intake inner pipe and contacts the inner wall of the second casing of the geothermal well.

[0015] Preferably, the water-stopping device is a water-stopping umbrella;

[0016] The water-stopping device is fitted onto the outside of the water intake pipe.

[0017] Preferably, the water-stopping device is located inside the second casing of the geothermal well;

[0018] The water-stopping device is an inverted frustum shape without top or bottom, and the edge of the water-stopping device is in contact with the inner wall of the second-opening casing of the geothermal well.

[0019] Preferably, the water intake inner pipe is equipped with two sets of water-stopping devices at intervals from top to bottom.

[0020] Preferably, a horn-shaped water inlet device is installed at the top of the water intake inner pipe, and the width of the water inlet device is greater than the width of the water intake inner pipe.

[0021] Preferably, the sealing structure is sleeved on the top of the side wall of the water intake inner pipe and is located between the bottom of the water inlet device and the top of the second-opening casing of the geothermal well, abutting against both, and sealing the opening of the second-opening casing of the geothermal well.

[0022] Preferably, the diameter of the water intake inner pipe is Φ127mm.

[0023] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0024] This invention comprehensively considers factors such as formation characteristics, drilling technology, casing structure, and sealing mechanism, and can effectively seal off and prevent low-temperature water, ensuring the stable and efficient operation of geothermal wells, meeting the water temperature requirements for geothermal resource development and utilization, and providing a strong guarantee for the sustainable development of geothermal energy. Attached Figure Description

[0025] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0026] Figure 1 This is a schematic diagram of a device for heating medium-deep geothermal wells;

[0027] In the picture:

[0028] 1-Geothermal well casing (first opening); 2-Geothermal well casing (second opening); 3-Water intake inner pipe; 4-Sealing structure; 5-Water-stopping device; 6-Water inlet device; 7-Sealing ring; 8-Expanding rubber. Detailed Implementation

[0029] Many specific details are set forth in the following description to provide a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0030] The terminology used in one or more embodiments of this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the one or more embodiments of this specification. The singular forms “a,” “described,” and “the” as used in one or more embodiments of this specification and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in one or more embodiments of this specification refers to and includes any or all possible combinations of one or more associated listed items.

[0031] It should be understood that although the terms first, second, etc., may be used to describe various information in one or more embodiments of this specification, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, first may also be referred to as second without departing from the scope of one or more embodiments of this specification, and similarly, second may also be referred to as first. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to a determination."

[0032] The present invention will now be described in further detail with reference to the accompanying drawings:

[0033] This utility model provides a device for increasing the temperature of medium-deep geothermal wells, comprising:

[0034] Geothermal well casing 1;

[0035] The second casing 2 of the geothermal well is located below the first casing 1 of the geothermal well, and its top extends into the first casing 1 of the geothermal well.

[0036] Water intake pipe 3 is installed inside the second casing 2 of the geothermal well, and its top extends out of the second casing 2 of the geothermal well and into the first casing 1 of the geothermal well; geothermal water is extracted through water intake pipe 3.

[0037] in:

[0038] A sealing structure 4 is installed between the top of the side wall of the water intake inner pipe 3 and the top of the geothermal well second casing 2;

[0039] A water-stopping device 5 is installed on the water intake inner pipe 3.

[0040] Preferably, an expansion rubber 8 is installed between the geothermal well casing 2 and the water intake inner pipe 3;

[0041] The expanded rubber 8 is located near the top of the inner wall of the second casing 2 of the geothermal well;

[0042] The expanded rubber 8 is sleeved on the water intake inner pipe 3 and contacts the inner wall of the geothermal well second casing 2;

[0043] After absorbing water, the expanding rubber 8 expands and squeezes the water intake inner pipe 3 and the geothermal well second casing 2 to achieve a preliminary seal.

[0044] Preferably, the water-stopping device 5 is a water-stopping umbrella;

[0045] The water-stopping device 5 is installed on the outside of the water intake inner pipe 3.

[0046] Preferably, the water-stopping device 5 is located inside the second casing 2 of the geothermal well;

[0047] The water-stopping device 5 is an inverted frustum shape without top and bottom, and the edge of the water-stopping device 5 is in contact with the inner wall of the geothermal well casing 2.

[0048] The waterproof umbrella prevents rainwater from entering the gap between the second casing 2 and the water intake inner pipe 3 of the geothermal well.

[0049] Preferably, the water intake inner pipe 3 is equipped with two sets of water-stopping devices 5 at intervals from top to bottom.

[0050] Preferably, a horn-shaped water inlet device 6 is installed at the top of the water intake inner pipe 3, and the width of the water inlet device 6 is greater than the width of the water intake inner pipe 3.

[0051] Preferably, the sealing structure 4 is sleeved on the top of the side wall of the water intake inner pipe 3 and is located between the bottom of the water inlet device 6 and the top of the geothermal well second-opening casing 2, abutting against both, and sealing the opening of the geothermal well second-opening casing 2; the diameter of the water intake inner pipe 3 is smaller than the diameter of the geothermal well second-opening casing 2, and the sealing structure 4 can contact the water intake inner pipe 3 to seal the opening of the geothermal well second-opening casing 2, preventing heat from being lost from it.

[0052] Preferably, an annular sealing groove is provided on the top of the inner wall of the geothermal well double-sleeve 2, and a sealing ring 7 is installed in the sealing groove; the sealing ring 7 contacts the sealing structure 4, and its inner diameter is slightly smaller than the inner diameter of the geothermal well double-sleeve 2, so that it can contact the auxiliary sealing structure 4 more closely, and the sealing ring 7 can assist the sealing structure 4 in sealing.

[0053] Preferably, the diameter of the water intake inner pipe 3 is Φ127mm.

[0054] This utility model ensures that water in the upper part of the aquifer will not flow into the middle and lower high-temperature aquifer through the sequential sealing of the sealing structure 4, the expanding rubber 8, and the water-stopping device 5, thus ensuring that the water temperature of the geothermal well meets the standard.

[0055] To better illustrate the technical effects of this utility model, the present utility model provides the following specific embodiments to explain the above technical process:

[0056] Example 1: A device for increasing the temperature of a medium-deep geothermal well:

[0057] After well completion, the water temperature was low at only 61℃, while the average temperature of geothermal wells in the area is 80-90℃. This resulted in low geothermal production capacity and low operating efficiency. To address this, the project team, based on well logging data, identified the low-temperature water layer and used a combination of a Φ127mm water intake pipe (3), a sealing structure (4), a water-stopping device (5), and an expansion rubber (8) to seal the geothermal water in this layer. After sealing, the water temperature reached 90℃, achieving the required temperature and improving efficiency. This combination device is simple, practical, and low-cost, providing significant assistance for the stable and efficient operation of geothermal wells.

[0058] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A device for increasing the temperature of a medium-deep geothermal well, characterized in that, include: Geothermal well casing (1); The second casing (2) of the geothermal well is located below the first casing (1) of the geothermal well, and its top extends into the first casing (1) of the geothermal well. Water intake pipe (3) is installed inside the second casing (2) of the geothermal well, and its top extends out of the second casing (2) of the geothermal well and into the first casing (1) of the geothermal well; in: A sealing structure (4) is installed between the top of the side wall of the water intake inner pipe (3) and the top of the geothermal well second casing (2). A water-stopping device (5) is installed on the water intake inner pipe (3); The top of the inner wall of the geothermal well casing (2) is provided with an annular sealing groove, and a sealing ring (7) is installed in the sealing groove.

2. The device for heating medium-deep geothermal wells according to claim 1, characterized in that: An expansion rubber (8) is installed between the second casing (2) of the geothermal well and the water intake inner pipe (3).

3. The device for heating medium-deep geothermal wells according to claim 2, characterized in that: The expanded rubber (8) is located near the top of the inner wall of the second casing (2) of the geothermal well; The expanded rubber (8) is sleeved on the water intake inner pipe (3) and contacts the inner wall of the geothermal well second casing (2).

4. The device for heating medium-deep geothermal wells according to claim 3, characterized in that: The water-stopping device (5) is a water-stopping umbrella; The water-stopping device (5) is fitted on the outside of the water intake inner pipe (3).

5. The device for heating medium-deep geothermal wells according to claim 4, characterized in that: The water-stopping device (5) is located inside the second casing (2) of the geothermal well; The water-stopping device (5) is an inverted frustum shape without top and bottom, and the edge of the water-stopping device (5) is in contact with the inner wall of the geothermal well casing (2).

6. The device for heating medium-deep geothermal wells according to claim 5, characterized in that: The water intake pipe (3) is equipped with two sets of water-stopping devices (5) at intervals from top to bottom.

7. The device for heating medium-deep geothermal wells according to claim 6, characterized in that: The top of the water intake pipe (3) is equipped with a trumpet-shaped water inlet device (6), the width of which is greater than the width of the water intake pipe (3).

8. The device for heating medium-deep geothermal wells according to claim 7, characterized in that: The sealing structure (4) is fitted on the top of the side wall of the water intake inner pipe (3) and located between the bottom of the water inlet device (6) and the top of the geothermal well second-opening casing (2), and abuts against both of them, and blocks the pipe opening of the geothermal well second-opening casing (2).

9. The device for heating medium-deep geothermal wells according to claim 8, characterized in that: The diameter of the water intake inner pipe (3) is Φ127mm.

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