CN218162915U - High temperature resistant downhole integrated heating cable - Google Patents
High temperature resistant downhole integrated heating cable Download PDFInfo
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- CN218162915U CN218162915U CN202222668179.0U CN202222668179U CN218162915U CN 218162915 U CN218162915 U CN 218162915U CN 202222668179 U CN202222668179 U CN 202222668179U CN 218162915 U CN218162915 U CN 218162915U
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Abstract
The utility model relates to a high temperature resistance is integration heating cable in pit, including cold section conductor and heating section conductor, respectively be connected through a changeover portion conductor between every cold section conductor and the every heating section conductor, the resistivity of changeover portion conductor is less than rather than the continuous heating section conductor but is higher than rather than the continuous cold section conductor. The utility model discloses a product sets up the changeover portion, can prevent that cold section conductor is direct to be connected with heating conductor, and high-temperature oxidation inefficacy improves and connects reliability and life between the conductor, is applicable to deep well oil development.
Description
Technical Field
The utility model belongs to the technical field of mineral insulation heating cable, a high temperature resistance integration heating cable in pit is related to.
Background
The utility model relates to a high temperature resistant integration heating cable in pit has characteristics such as fire prevention, waterproof, explosion-proof, anti-overload, non-ageing, radiation-resistant, resistant mechanical damage, power characteristic height and automatic control, and the wide application is in petrochemical pipeline heat preservation and heating for outdoor facilities's such as runway, railway track, bridge, parking area, outdoor stair snow melt ice, fields such as the exploitation of oil and shale gas. The mineral insulated heating cable is adopted to heat instead of steam to extract high viscous oil and high pour point oil, so that the method is more suitable for extracting deep wells with the extraction depth of 1000-5000m, and can improve the oil extraction efficiency. Shale gas in-situ mining heating technologies can be divided into three types: electric heating technology, steam heating technology and microwave radiation heating, wherein the electric heating technology adopts a mineral insulated heating cable for heating treatment.
The heating cable structure of prior art is outer tube, mineral insulating material, heating element (or call heating conductor, heater strip) and constitutes, and power cable is TU or T1, T2, T3 copper product, and power cable directly is connected with heating element, specifically as follows:
(1) Patent CN 113966017A discloses a mineral insulated electrical heating system for steam injection well electric heat assisted production. The disclosed integrated cable has a cold wire made of T2 material and a hot wire made of NC02O material, wherein the hot wire and the wire core of the cold wire are butted into a whole by cold pressing, so that the power cable made of copper is directly connected with a heating element (hot wire);
(2) Patent CN212344092U discloses a high-power ultra-high temperature constant temperature heating cable, wherein a connecting wire of the disclosed heating cable adopts a high-purity copper rod with copper content more than or equal to 99.99%, a heating conductor adopts a high-nickel alloy rod with Cr content more than or equal to 80% after solid solution strengthening treatment, the connecting rod and the heating conductor are connected in a drilling, nesting or crimping mode, and therefore the power cable with visible copper is directly connected with a heating element (hot wire).
Melting point of copper: 1083.4 ℃ and the service temperature of the pure copper product is generally less than 400 ℃, otherwise, the performance change and even the annealing phenomenon can occur. Therefore, the heating element of the heating cable is directly connected to the power cable, and the connection is very unreasonable when the joint is at a high temperature for a long time, especially when the heating temperature is 600-1000 ℃, and the service life is seriously affected.
Therefore, it is very important to research a high temperature resistant downhole integrated heating cable to solve the above problems.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the problem that exists among the prior art, provide a high temperature resistant integration heating cable in pit.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a high-temperature-resistant underground integrated heating cable comprises cold-section conductors and heating-section conductors, wherein each cold-section conductor is connected with each heating-section conductor through a transition-section conductor, and the resistivity of the transition-section conductor is lower than that of the heating-section conductor connected with the transition-section conductor but higher than that of the cold-section conductor connected with the transition-section conductor; the transition section conductor is used for forming a transition area between the cold section conductor and the heating section conductor, and the transition section conductor generates heat under the condition of electrifying, but because the resistivity is lower than that of the heating section conductor connected with the transition section conductor but higher than that of the cold section conductor connected with the transition section conductor, the temperature of the transition section conductor is lower than that of the heating section conductor connected with the transition section conductor, and the reduction of the service life caused by the direct connection of the cold section conductor and the high-temperature heating section conductor is avoided.
As a preferable technical scheme:
according to the high-temperature-resistant underground integrated heating cable, the cold section conductor and the transition section conductor are connected in a brazing mode; the heating section conductor and the transition section conductor are connected in a welding mode.
According to the high-temperature-resistant underground integrated heating cable, the heating section conductor is a Ni wire, a Cu-Ni alloy wire, a Ni-Cr alloy wire or a FeCrAl alloy wire; the heating section conductor is used for heating under the condition of electrifying, and converting electric energy into heat energy; the transition section conductor is Ni wire or Cu-Ni alloy wire; the cold section conductor is TU wire, T1 wire, T2 wire or T3 wire; the cold leg conductor functions to provide power to the hot leg conductor.
The high-temperature-resistant underground integrated heating cable has the advantages that the diameter of the heating section conductor is 1-10 mm; the diameter of the transition section conductor is 1-10 mm; the diameter of the cold section conductor is 2-15 mm; the cold leg is copper and must have a large cross-sectional area for passing the same current, and therefore must have a larger diameter.
According to the high-temperature-resistant underground integrated heating cable, the two groups of cold-section conductors are respectively positioned at the two sides of the heating section conductor in the length direction and are marked as a cold-section conductor I and a cold-section conductor II; the two groups of transition section conductors are respectively positioned at two sides of the heating section conductor in the length direction and are marked as a transition section conductor I and a transition section conductor II.
As above-mentioned high temperature resistance is heating cable in pit, cold section conductor I, changeover portion conductor I, heating section conductor, changeover portion conductor II, cold section conductor II arrange in proper order from left to right along the length direction of heating cable in pit, and length corresponds respectively and is: 100 to 2000m, 0.5 to 10m, 10 to 3000m, 100 to 2000m and 0.2 to 1m.
According to the high-temperature-resistant underground integrated heating cable, the cold-section conductor I, the transition-section conductor I, the heating-section conductor, the transition-section conductor II and the cold-section conductor II are all inserted into the mineral insulator filled in the outer pipe, and the left end of the cold-section conductor I and the right end of the cold-section conductor II are partially exposed from the left end of the cold-section conductor I and the right end of the cold-section conductor II.
The high-temperature-resistant downhole integrated heating cable has the advantages that the wall thickness of the outer pipe is 1.0-3.5 mm, and the outer diameter is 10-35 mm; the outer tube is a 316 tube, a 316L tube, a 310S tube, a 310H tube, a 3039 tube, an Inconel600 tube, an Inconel601 tube, an Inconel625 tube, an Incoloy800 tube, an Incoloy825 tube, an S32205 tube or an S32750 tube; the outer pipe is used for isolating the heating cable from external media, and has the characteristics of high temperature resistance, corrosion resistance, oxidation resistance and higher mechanical strength; the material of the mineral insulator is MgO and Al 2 O 3 SiO, alN and NB.
According to the high-temperature-resistant underground integrated heating cable, the left end of the outer pipe is inserted into the cold end of the cable and is connected with the cold end of the cable in a welding mode; the left end of the cold-section conductor I is inserted into an insulating substance a filled in the cold end of the cable; the left end of the cold-section conductor I and the right end of a power cable partially inserted into an insulating substance a filled in the cold end of the cable are soldered, and the power cable is used for connecting an external power supply; and sealant is filled between the power cable and the cold end of the cable.
According to the high-temperature-resistant underground integrated heating cable, the cold end of the cable is made of 304, 316L or 310S; the cold end of the cable is used for protecting the cold end internal joint and isolating the internal elements of the cable from external media; the insulating material a is MgO or Al 2 O 3 One or a mixture of more of SiO, alN and NB or ceramic glue (including CEMENT NO8 produced by SAUEREISEN); the insulating substance a is used for maintaining the insulation between the conductors and the cold ends of the cables; the sealant is epoxy sealant; the sealant has the function of sealing and preventing external moisture from entering the cable.
According to the high-temperature-resistant underground integrated heating cable, the number of the heating section conductors is three, the heating section conductors are arranged in parallel, the number of the cold section conductors I is three, the cold section conductors I are arranged in parallel, and the number of the cold section conductors II is three, the cold section conductors II are arranged in parallel; the right end of the outer tube is inserted into the front end shell and is welded with the front end shell; a compaction sleeve is fixedly arranged in an insulating substance b filled in the front end shell, the right ends of all the cold-section conductors II are inserted into the compaction sleeve and then are gathered together, and the inner holes of the compaction sleeve are three tangential combined holes matched with the diameter of the cold-section conductors II; the right end of the front end shell is connected with the end head, the left end of the end head is welded with the front end shell after being pressed into the front end shell, and the right end of the end head is arc-shaped and has a guiding effect during installation; compared with the prior art, the utility model is additionally provided with the pressing sleeve, and the three cold-section conductors II are firstly pressed and then welded, so that the connection reliability can be improved; compared with the prior art, the utility model also presses the left end of the end head into the front end shell and then is welded with the front end shell, thus improving the compactness of the insulating material b; the utility model discloses the right-hand member that has still designed the end for prior art is convex to do benefit to the installation.
The high-temperature-resistant downhole integrated heating cable and the insulating substanceThe material of b is MgO and Al 2 O 3 One or a mixture of more of SiO, alN and NB or ceramic glue (including CEMENT NO8 produced by SAUEREISEN); the insulating substance b is used for keeping insulation between the conductors and the front end shell and the end head; the front end shell is made of the same material as the outer tube; the front end shell is used for protecting the front end internal joint and isolating the internal elements of the cable from external media; the material of the pressing sleeve is TU, T1, T2, T3, 316L, 310S, 310H, 3039, inconel600, inconel601, inconel625, incoloy800, incoloy825, S32205 or S32750; the end head is made of the same material as the outer pipe; the function of the end head is to protect the front-end inner connector and isolate the cable inner element from the external medium.
Advantageous effects
The utility model discloses a high temperature resistant integrated heating cable in pit sets up the changeover portion, can prevent that the cold section conductor is direct to be connected with heating conductor, and high temperature oxidation is inefficacy, improves and connects reliability and life between the conductor, is applicable to deep well oil development.
Drawings
Fig. 1 is a schematic structural diagram of a high-temperature resistant downhole integrated heating cable according to the present invention;
fig. 2 is a schematic structural view of the three-core heating cable of the present invention;
fig. 3 is a schematic cross-sectional view of a three-core heating cable of the present invention;
fig. 4 is a schematic structural view of the cold end of the present invention;
fig. 5 is a schematic structural view of the front end of the cable of the present invention;
fig. 6 is a schematic view of the structure of the compressing sleeve of the present invention;
wherein 1-1 is an outer tube, 1-2 is a mineral insulator, 1-3 is a cold section conductor I,1-4 is a transition section conductor I,1-5 is a heating section conductor, 1-6 is a transition section conductor II,1-7 is a cold section conductor II,2-1 is a cable cold end, 2-2 is an insulating substance a,2-3 is a sealant, 2-4 is a power cable, 3-1 is an insulating substance b,3-2 is a front end shell, 3-3 is a compression sleeve, and 3-4 is an end head.
Detailed Description
The present invention will be further described with reference to the following detailed description. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that various changes and modifications of the present invention may be made by those skilled in the art after reading the teachings of the present invention, and these equivalents also fall within the scope of the appended claims.
A high-temperature-resistant underground integrated heating cable is shown in figures 1-2 and comprises a cold section conductor I1-3, a transition section conductor I1-4, a heating section conductor 1-5, a transition section conductor II 1-6 and a cold section conductor II 1-7 which are sequentially arranged from left to right along the length direction of the underground integrated heating cable, wherein the lengths of the cold section conductor I1-3, the transition section conductor I1-4, the heating section conductor 1-5, the transition section conductor II 1-6 and the cold section conductor II 1-7 are respectively corresponding to that: 100-2000 m, 0.5-10 m, 10-3000 m, 100-2000 m and 0.2-1 m;
as shown in fig. 3, three cold section conductors I1-3, three transition section conductors I1-4, three heating section conductors 1-5, three transition section conductors II 1-6, and three cold section conductors II 1-7 are arranged in parallel; each cold section conductor I1-3 is respectively connected with one transition section conductor I1-4 in a brazing mode; each transition section conductor I1-4 is connected with one heating section conductor 1-5 in a welding mode; each heating section conductor 1-5 is connected with a transition section conductor II 1-6 in a welding mode; each transition section conductor II 1-6 is respectively connected with one cold section conductor II 1-7 in a brazing mode;
the heating section conductors 1-5, the transition section conductors I1-4 and the cold section conductors I1-3 are respectively corresponding to Ni-Cr alloy wires, ni wires and T2 wires, or respectively corresponding to Ni wires, cu-Ni alloy wires and TU wires, or respectively corresponding to FeCrAl alloy wires, ni wires and T2 wires, or respectively corresponding to Ni-Cr alloy wires, cu-Ni alloy wires and T2 wires;
the heating section conductors 1-5, the transition section conductors II 1-6 and the cold section conductors II 1-7 are respectively corresponding to Ni-Cr alloy wires, ni wires and T2 wires, or respectively corresponding to Ni wires, cu-Ni alloy wires and TU wires, or respectively corresponding to FeCrAl alloy wires, ni wires and T2 wires, or respectively corresponding to Ni-Cr alloy wires, cu-Ni alloy wires and T2 wires;
the diameter of the heating section conductor 1-5 is 1-10 mm; the diameter of the transition section conductor I1-4 (or the transition section conductor II 1-6) is 1-10 mm; the diameter of the cold section conductor I1-3 (or the cold section conductor II 1-7) is 2-15 mm;
the cold section conductor I1-3, the transition section conductor I1-4, the heating section conductor 1-5, the transition section conductor II 1-6 and the cold section conductor II 1-7 are all inserted into the mineral insulator 1-2 filled in the outer tube 1-1, and the left end of the cold section conductor I1-3 and the right end of the cold section conductor II 1-7 are partially exposed from the left end and the right end; the wall thickness of the outer tube 1-1 is 1.0-3.5 mm, and the outer diameter is 10-35 mm; the outer pipe 1-1 is a 316 pipe, a 316L pipe, a 310S pipe, a 310H pipe, a 3039 pipe, an Inconel600 pipe, an Inconel601 pipe, an Inconel625 pipe, an Incoloy800 pipe, an Incoloy825 pipe, an S32205 pipe or an S32750 pipe; the material of the mineral insulator 1-2 is MgO and Al 2 O 3 One or a mixture of more of SiO, alN and NB;
as shown in fig. 4, the left end of the outer tube 1-1 is inserted into the cable cold end 2-1 and is welded with the cable cold end; the left end of the cold-section conductor I1-3 is inserted into an insulating substance a 2-2 filled in the cold end 2-1 of the cable; the left end of the cold-section conductor I1-3 is soldered with the right end of the power cable 2-4 partially inserted into the insulating substance a 2-2 filled in the cold end 2-1 of the cable; the space between the power cable 2-4 and the cable cold end 2-1 is filled with sealant 2-3; wherein the material of the cable cold end 2-1 is 304, 316L or 310S; the insulating material a 2-2 is MgO or Al 2 O 3 One or a mixture of more of SiO, alN and NB or ceramic glue including CEMENT NO8 produced by SAUEREISEN; the sealant 2-3 is epoxy sealant;
as shown in fig. 5 to 6, the right end of the outer tube 1-1 is inserted into the front end housing 3-2 and is welded thereto; a compaction sleeve 3-3 is fixedly arranged in an insulating substance b 3-1 filled in the front end shell 3-2, the right ends of all cold-section conductors II 1-7 are inserted into the compaction sleeve 3-3 and then are gathered together, and the inner holes of the compaction sleeve 3-3 are three tangent combined holes matched with the diameters of the cold-section conductors II 1-7; the right end of the front end shell 3-2 is connected with the end head 3-4, the left end of the end head 3-4 is welded with the front end shell 3-2 after being pressed into the front end shell 3-2, and the right end of the end head 3-4 is arc-shaped;wherein the insulating material b 3-1 is MgO or Al 2 O 3 One or a mixture of more of SiO, alN and NB or ceramic glue including CEMENT NO8 produced by SAUEREISEN; the front end shell 3-2 is made of the same material as the outer tube 1-1; the pressing sleeve 3-3 is made of TU, T1, T2, T3, 316L, 310S, 310H, 3039, inconel600, inconel601, inconel625, incoloy800, incoloy825, S32205 or S32750; the end head 3-4 is made of the same material as the outer pipe 1-1.
Claims (10)
1. A high-temperature-resistant underground integrated heating cable comprises cold-section conductors and heating-section conductors (1-5), and is characterized in that each cold-section conductor is connected with each heating-section conductor (1-5) through a transition-section conductor, and the resistivity of the transition-section conductor is lower than that of the heating-section conductor (1-5) connected with the transition-section conductor but higher than that of the cold-section conductor connected with the transition-section conductor.
2. The high-temperature-resistant downhole integrated heating cable according to claim 1, wherein the cold section conductor and the transition section conductor are connected in a brazing manner; the heating section conductors (1-5) are connected with the transition section conductors in a welding mode.
3. The high-temperature-resistant downhole integrated heating cable according to claim 1, wherein the heating section conductors (1-5) are Ni wires, cu-Ni alloy wires, ni-Cr alloy wires or FeCrAl alloy wires; the transition section conductor is a Ni wire or a Cu-Ni alloy wire; the cold section conductor is a TU wire, a T1 wire, a T2 wire or a T3 wire.
4. The high-temperature-resistant downhole integrated heating cable according to claim 1, wherein the diameter of the heating section conductor (1-5) is 1-10 mm; the diameter of the transition section conductor is 1-10 mm; the diameter of the cold section conductor is 2-15 mm.
5. The high-temperature-resistant downhole integrated heating cable according to any one of claims 1 to 4, wherein the two groups of cold-section conductors are respectively positioned at two sides of the heating-section conductor (1-5) in the length direction and are marked as a cold-section conductor I (1-3) and a cold-section conductor II (1-7); the two groups of transition section conductors are respectively positioned at two sides of the heating section conductors (1-5) in the length direction and are marked as transition section conductors I (1-4) and transition section conductors II (1-6).
6. The high-temperature-resistant downhole integrated heating cable according to claim 5, wherein the cold-section conductor I (1-3), the transition-section conductor I (1-4), the heating-section conductor (1-5), the transition-section conductor II (1-6) and the cold-section conductor II (1-7) are sequentially arranged from left to right along the length direction of the downhole integrated heating cable, and the lengths respectively correspond to: 100 to 2000m, 0.5 to 10m, 10 to 3000m, 100 to 2000m and 0.2 to 1m.
7. The high-temperature-resistant downhole integrated heating cable according to claim 6, wherein the cold section conductors I (1-3), the transition section conductors I (1-4), the heating section conductors (1-5), the transition section conductors II (1-6) and the cold section conductors II (1-7) are all inserted into mineral insulators (1-2) filled in the outer pipes (1-1), and the left ends of the cold section conductors I (1-3) and the right ends of the cold section conductors II (1-7) are partially exposed from the left ends.
8. The high-temperature-resistant downhole integrated heating cable according to claim 7, wherein the wall thickness of the outer tube (1-1) is 1.0-3.5 mm; the outer pipe (1-1) is 316 pipe, 316L pipe, 310S pipe, 310H pipe, 3039 pipe, inconel600 pipe, inconel601 pipe, inconel625 pipe, incoloy800 pipe, incoloy825 pipe, S32205 pipe or S32750 pipe.
9. The high-temperature-resistant downhole integrated heating cable according to claim 7, wherein the left end of the outer tube (1-1) is inserted into the cold end (2-1) of the cable and is welded with the cold end; the left end of the cold-section conductor I (1-3) is inserted into an insulating substance a (2-2) filled in the cold end (2-1) of the cable; the left end of the cold-section conductor I (1-3) is soldered with the right end of the power cable (2-4) partially inserted into the insulating substance a (2-2) filled in the cold end (2-1) of the cable; the space between the power cable (2-4) and the cable cold end (2-1) is filled with sealant (2-3).
10. The high-temperature-resistant downhole integrated heating cable according to claim 7, wherein the heating section conductors (1-5) are three in number and arranged in parallel with each other, the cold section conductors I (1-3) are three in number and arranged in parallel with each other, and the cold section conductors II (1-7) are three in number and arranged in parallel with each other; the right end of the outer pipe (1-1) is inserted into the front end shell (3-2) and is connected with the front end shell in a welding way; a compression sleeve (3-3) is fixedly placed in an insulating substance b (3-1) filled in the front end shell (3-2), the right ends of all cold-section conductors II (1-7) are inserted into the compression sleeve (3-3) and then are closed together, and the inner holes of the compression sleeve (3-3) are three tangent combined holes matched with the diameters of the cold-section conductors II (1-7); the right end of the front end shell (3-2) is connected with the end head (3-4), the left end of the end head (3-4) is welded with the front end shell (3-2) after being pressed into the front end shell, and the right end of the end head (3-4) is arc-shaped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222668179.0U CN218162915U (en) | 2022-10-11 | 2022-10-11 | High temperature resistant downhole integrated heating cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222668179.0U CN218162915U (en) | 2022-10-11 | 2022-10-11 | High temperature resistant downhole integrated heating cable |
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| Publication Number | Publication Date |
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| CN218162915U true CN218162915U (en) | 2022-12-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202222668179.0U Active CN218162915U (en) | 2022-10-11 | 2022-10-11 | High temperature resistant downhole integrated heating cable |
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| CN (1) | CN218162915U (en) |
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2022
- 2022-10-11 CN CN202222668179.0U patent/CN218162915U/en active Active
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