CN217356144U - Flexible central heat exchange tube - Google Patents
Flexible central heat exchange tube Download PDFInfo
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- CN217356144U CN217356144U CN202221079935.XU CN202221079935U CN217356144U CN 217356144 U CN217356144 U CN 217356144U CN 202221079935 U CN202221079935 U CN 202221079935U CN 217356144 U CN217356144 U CN 217356144U
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- heat exchange
- exchange tube
- flexible central
- central heat
- steel
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
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Abstract
A flexible central heat exchange tube comprises an anti-corrosion layer, a modulation steel layer and a heat insulation layer, wherein the anti-corrosion layer is made of polyvinylidene fluoride or polyurethane and is 1-1.5mm thick, the modulation steel layer is made of high-strength low-alloy modulation steel and is 3.175-5.156mm thick, and the heat insulation layer is made of SiO 2 Aerogel with the thickness of 5-10 mm; when the flexible central heat exchange tube is installed, the flexible central heat exchange tube is wound on a winding drum and conveyed to a well head, the flexible central heat exchange tube is pulled out of the winding drum and is put into a highly-deviated well or a horizontal well bottom; by injecting heat exchange working medium into the flexible central heat exchange tube and the sleeve ring, the flexible central heat exchange tube and the sleeve ring are reversely conveyed to a well head from a well bottom through an inner cavity of the central tube, and underground geothermal resources are fully utilized for heat exchange utilization; the length of the flexible central heat exchange tube is continuously adapted to the well depth, and the middle part of the flexible central heat exchange tube is provided with no joint hoop or wireThe flexible heat exchange tube has the advantages of simple structure, small friction, small operation difficulty, high efficiency and strong practicability.
Description
Technical Field
The utility model relates to a bury formula heat exchange tube deeply, concretely relates to flexible center heat exchange tube.
Background
The waste oil-gas well is transformed into a geothermal well, so that the development cost of the geothermal well can be reduced, and the development of the geothermal energy of the oil field is promoted. A large number of abandoned large-inclination directional wells and horizontal wells exist in the exploration and development of oil fields, and the large-inclination directional wells and the horizontal wells have higher single-well heat exchange capacity than the vertical wells under the same condition. Therefore, the large-inclination directional well and the horizontal well have higher geothermal utilization and transformation values than the vertical well. The adoption of a middle-deep buried pipe type heat exchange technology is a mode for shaft reconstruction. The central heat exchange tube in the prior art mainly adopts a steel heat insulation oil tube, a PE-RT heat insulation tube and a tube improved on the basis of the two tubes, and is characterized by having certain heat insulation performance and belonging to a rigid tube.
For a large-inclination directional well and a horizontal well, as the inclination angle of the well is large, the horizontal displacement is long, the section of the open hole steady-inclination well is long, the track of the well is complex, and a rigid pipe is adopted as a central heat exchange pipe for heat exchange, the following problems exist: (1) when the rigid central heat exchange tube is inserted into a highly-inclined well section and a horizontal well section, the frictional resistance between the tube and the well wall is increased, the self-locking phenomenon possibly occurs along with the continuous increase of the frictional resistance, the tube cannot move forwards continuously at the moment, the tube cannot be inserted into a preset depth, and the high-temperature heat exchange well section at the lower part of a shaft is lost. (2) When the rigid central pipe is in a bending section of a borehole, the pipe is unstably bent due to the increase of axial pressure, and the safety factor of the central pipe is reduced. (3) Each section of rigid pipe is about 9m, and each section of rigid pipe is connected by adopting a thread; in the process of putting the rigid central heat exchange tube into the well, the screw thread is fastened one by one on the ground according to the order of putting the tube down, and the tube is put into the well bottom, so the operation is complex. And under the action of the internal and external pressure and the axial force of the underground liquid, the strength of the central heat exchange pipe is further reduced, and the central heat exchange pipe is easy to crack, flatten and permanently deform. The modification of the existing waste oil and gas well geothermal utilization shaft is only limited to a vertical shaft, and a horizontal shaft is little involved, so that the improvement of a rigid central heat exchange tube is urgently needed to solve the problem of geothermal resource utilization of a highly-deviated well and a horizontal well.
Disclosure of Invention
In order to overcome the defects of the prior art, the utility model aims to provide a flexible central heat exchange tube, which is provided with a flexible tube with an anticorrosive coating, a modulation steel layer and a thermal insulation layer, wherein the length of the tube is matched with the well depth, the tube is continuous, no joint hoop is arranged in the middle, the well descending speed is high, the friction resistance of a well section with high inclination and a horizontal well section is small, and the situation that the well is not in place is avoided; simultaneously, flexible center heat exchange tube possesses corresponding intensity, can satisfy the construction conditions in the pit, and the inner wall anticorrosive coating can avoid heat transfer working medium to have the corruption to the tubular product inner wall, and outside insulating layer can give improvement heat-proof quality, has simple structure, rubs and hinders for a short time, and the operation degree of difficulty is little, and is efficient, advantage that the practicality is strong.
In order to realize the above purpose, the utility model discloses the technical scheme who adopts does:
a flexible central heat exchange tube comprises an anticorrosive layer 1, a modulation steel layer 2 and a heat insulation layer 3 which are arranged from inside to outside, wherein the anticorrosive layer 1 is made of polyvinylidene fluoride or polyurethane and has the thickness of 1-1.5mm, the modulation steel layer 2 is made of high-strength low-alloy modulation steel and has the thickness of 3.175-5.156mm, and the heat insulation layer 3 is made of SiO 2 Aerogel with thickness of 5-10 mm.
The outer diameter of the modulated steel layer 2 is 73.0-88.9 mm.
The maximum hardness of the high-strength low-alloy steel of the steel layer 2 is 22 HRC.
The steel grade of the high-strength low-alloy steel for the modulation steel layer 2 comprises CT-70 grade, CT-80 grade or CT-90 grade.
CT-70 grade minimum yield strength of the high-strength low-alloy prepared steel is 480Mpa, and minimum tensile strength is 550 Mpa; CT-80 grade minimum yield strength 550Mpa and minimum tensile strength 620Mpa of the high-strength low-alloy prepared steel; the CT-90 grade minimum yield strength 620MPa and the minimum tensile strength 690MPa of the high-strength low-alloy prepared steel.
The length of the flexible central heat exchange tube is continuously matched with the well depth, and no joint hoop or screw thread is arranged in the middle.
The heat conductivity coefficient of the flexible central heat exchange tube is less than or equal to 0.25W/(m.K).
Compared with the prior art, the utility model discloses following technological effect has:
(1) the flexible central heat exchange tubes are installed in highly deviated wells and horizontal wells, and the tube bodies are flexible, so that the length of the tube bodies is matched with the well depth, the friction resistance between a well section with large curvature of a well hole and the well wall can be reduced, and the tube bodies can be installed at a preset position of the well bottom.
(2) The flexible central heat exchange tube is continuously installed underground, no hoop or screw thread is arranged in the middle, the underground speed is high, the underground operation time can be saved, and the operation difficulty is reduced; when needing to be maintained or replaced, the well bottom can be taken out at one time, thereby reducing the difficulty of maintenance or replacement.
(3) The middle of the flexible central heat exchange tube is not provided with the joint hoop and the screw thread, so that the problems of slippage and sealing failure of screw thread connection can be avoided.
(4) The flexible central heat exchange tube has certain strength, and can avoid the breakage and deformation of the tube under the action of the internal and external pressure and the axial force of underground liquid.
(5) The heat insulation layer of the flexible central heat exchange tube has good heat insulation performance, can effectively avoid temperature loss of fluid in the tube, and ensures the heat exchange efficiency of a single well.
(6) The anticorrosive coating of the flexible central heat exchange tube can prevent the heat exchange working medium from corroding the inner wall of the tube, and the performance of the tube is improved.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Wherein: 1. anticorrosive coating, 2, modulation steel layer, 3, insulating layer.
Detailed Description
The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings.
Referring to FIG. 1, a flexible central heat exchange tube comprisesThe heat insulation layer comprises an anti-corrosion layer 1, a modulation steel layer 2 and a heat insulation layer 3 which are arranged from inside to outside, wherein the anti-corrosion layer 1 is made of polyvinylidene fluoride or polyurethane and is 1-1.5mm thick, the modulation steel layer 2 is made of high-strength low-alloy modulation steel and is 3.175-5.156mm thick, and the heat insulation layer 3 is made of SiO 2 Aerogel with thickness of 5-10 mm.
The outer diameter of the modulated steel layer 2 is 73.0-88.9 mm.
The steel grades of the high-strength low-alloy steel comprise CT-70 grade, CT-80 grade and CT-90 grade.
The maximum hardness of the high-strength low-alloy steel is 22 HRC.
CT-70 grade minimum yield strength of the high-strength low-alloy prepared steel is 480Mpa, and minimum tensile strength is 550 Mpa; CT-80 grade minimum yield strength 550Mpa and minimum tensile strength 620Mpa of the high-strength low-alloy prepared steel; the CT-90 grade minimum yield strength 620MPa and the minimum tensile strength 690MPa of the high-strength low-alloy prepared steel.
The length of the flexible central heat exchange tube is continuously matched with the well depth, no joint hoop or screw thread is arranged in the middle, the problems of slippage and sealing failure of screw thread connection can be avoided, the operation efficiency is high, and the tubing is high in well descending speed.
The heat conductivity coefficient of the flexible central heat exchange tube is less than or equal to 0.25W/(m.K), and the heat conductivity coefficient of the tube is lower, so that the single-well heat exchange amount is improved.
The utility model discloses the theory of operation does:
before the flexible central heat exchange tube is installed in a well, a shaft has the following conditions: the sleeve of the shaft has no casing damage, the perforation hole is blocked, the shaft is washed and the pressure test is qualified without loss.
When the flexible central heat exchange tube is installed, the flexible central heat exchange tube is wound on a winding drum and conveyed to a well head, the flexible central heat exchange tube is pulled out of the winding drum and is put into a highly-deviated well or a horizontal well bottom; by injecting heat exchange working medium into the flexible central heat exchange tube and the sleeve ring, the heat exchange working medium is returned to a well head from the well bottom through the inner cavity of the central tube, and underground geothermal resources are fully utilized for heat exchange utilization.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The utility model provides a flexible center heat exchange tube, includes anticorrosive coating (1), modulation steel layer (2) and insulating layer (3) by inside to outside setting, its characterized in that: the anticorrosive layer (1) is made of polyvinylidene fluoride or polyurethane and is 1-1.5mm thick, the modulation steel layer (2) is made of high-strength low-alloy modulation steel and is 3.175-5.156mm thick, and the heat insulation layer (3) is made of SiO 2 Aerogel with thickness of 5-10 mm.
2. A flexible central heat exchange tube according to claim 1, wherein: the outer diameter of the modulated steel layer (2) is 73.0-88.9 mm.
3. A flexible central heat exchange tube according to claim 1 wherein: the steel grade of the high-strength low-alloy steel comprises CT-70 grade, CT-80 grade or CT-90 grade.
4. A flexible central heat exchange tube according to claim 1, wherein: the maximum hardness of the high-strength low-alloy steel is 22 HRC.
5. A flexible central heat exchange tube according to claim 1 wherein: CT-70 grade minimum yield strength of the high-strength low-alloy prepared steel is 480Mpa, and minimum tensile strength is 550 Mpa; CT-80 grade minimum yield strength 550Mpa and minimum tensile strength 620Mpa of the high-strength low-alloy prepared steel; the CT-90 grade minimum yield strength 620MPa and the minimum tensile strength 690MPa of the high-strength low-alloy prepared steel.
6. A flexible central heat exchange tube according to claim 1, wherein: the length of the flexible central heat exchange tube is continuously matched with the well depth, and no joint hoop or screw thread is arranged in the middle.
7. A flexible central heat exchange tube according to claim 1, wherein: the heat conductivity coefficient of the flexible central heat exchange tube is less than or equal to 0.25W/(m.K).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221079935.XU CN217356144U (en) | 2022-05-07 | 2022-05-07 | Flexible central heat exchange tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221079935.XU CN217356144U (en) | 2022-05-07 | 2022-05-07 | Flexible central heat exchange tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217356144U true CN217356144U (en) | 2022-09-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221079935.XU Active CN217356144U (en) | 2022-05-07 | 2022-05-07 | Flexible central heat exchange tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217356144U (en) |
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2022
- 2022-05-07 CN CN202221079935.XU patent/CN217356144U/en active Active
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