Composite sealed ultra-high temperature steel armored cable jointing tube and jointing method

Abstract

The application relates to a composite sealing super-high-temperature steel armored cable joint pipe and a joint method, which comprises the following steps: a first joint pipe body is sleeved on a first cable end of a super-high-temperature steel armored cable to be connected, an insulating inner sleeve is arranged in the first joint pipe body, and the first joint pipe body is provided with a first connecting part and a second connecting part; a second joint pipe body is sleeved on a second cable end of the super-high-temperature steel armored cable to be connected, and the second joint pipe body is provided with a third connecting part and a fourth connecting part; the first connecting part is sleeved on the third connecting part, the first cable end and the second cable end of the super-high-temperature steel armored cable to be connected are connected together through the third connecting part and the first connecting part, and a locking structure is connected with the second connecting part and the fourth connecting part respectively, so that the first joint pipe body and the second joint pipe body are locked at the connecting position of the super-high-temperature steel armored cable. The application has the advantages of simple structure, small space occupation, convenient assembly, good sealing effect, high-temperature resistance and corrosion resistance, and can be applied in the field of super-high-temperature power cables.

Description

Technical Field

[0001] The present invention relates to the field of ultra-high temperature (350° C. and above) power cables, and in particular to a composite sealed ultra-high temperature steel armor cable wiring tube and a wiring method. Background Art

[0002] Currently, my country's offshore oil production primarily relies on integrated steam injection and production (IPP) technology. This technology results in underground temperatures exceeding 350°C. Furthermore, offshore oilfield reservoirs can reach depths of several thousand meters and are often accompanied by highly corrosive gases such as H2S. Therefore, ultra-high-temperature armored cables and ultra-high-temperature submersible electric pump units, suitable for these harsh operating conditions, are required for long-term underground lifting operations.

[0003] Due to the inherent characteristics of ultra-high-temperature armored cables and the harsh environment at the connection points, traditional power cable connection methods are no longer sufficient to connect ultra-high-temperature armored cables. Therefore, there is an urgent need to design a wiring conduit that can be used to connect and seal armored cables at both ends, while also providing excellent resistance to ultra-high temperatures, static high pressures, and corrosion. Summary of the Invention

[0004] In response to the above problems, the purpose of the present invention is to provide a composite sealed ultra-high temperature steel armored cable wiring tube and wiring method, which has a simple structure, small space occupation, convenient assembly, good sealing effect, and the advantages of high temperature resistance and corrosion resistance.

[0005] To achieve the above-mentioned objectives, the present invention adopts the following technical solution: a composite-sealed ultra-high-temperature steel-armored cable wiring tube, comprising: a first wiring tube body, which is sleeved on the first cable end of the ultra-high-temperature steel-armored cable to be connected, an insulating inner sleeve is provided inside the first wiring tube body, and has a first connecting portion and a second connecting portion; a second wiring tube body, which is sleeved on the second cable end of the ultra-high-temperature steel-armored cable to be connected, and has a third connecting portion and a fourth connecting portion, the first connecting portion being sleeved on the third connecting portion, and the first cable end and the second cable end of the ultra-high-temperature steel-armored cable to be connected being connected together through the third connecting portion and the first connecting portion being installed in cooperation with the first connecting portion; a locking structure, which is respectively connected to the second connecting portion and the fourth connecting portion, and locks the first wiring tube body and the second wiring tube body at the connection of the ultra-high-temperature steel-armored cable.

[0006] Furthermore, a second high-temperature O-ring is provided inside the second connection portion of the first wiring barrel body.

[0007] Furthermore, a first high-temperature O-ring and a first graphite sealing ring are provided on the outer side of the third connecting portion of the second wiring tube body, and a second high-temperature O-ring is provided on the inner side of the fourth connecting portion.

[0008] Furthermore, the locking structure includes a level I sealing cover, a graphite pressure plate, a pressure plate locking nut, a graphite pressure cover, a straightening ferrule pressure cover, a first graphite sealing ring, a second graphite sealing ring, a metal front ferrule and a metal rear ferrule; the straightening ferrule pressure cover is away from the first wiring tube body or the second wiring tube body to be locked, and is located on the inner side of the straightening ferrule pressure cover, and is sequentially provided with the metal rear ferrule, the metal front ferrule, the graphite pressure cover, the second graphite sealing ring and the level I sealing cover, and is sequentially provided on the inner side of the level I sealing cover, and is sequentially provided with the metal rear ferrule, the metal front ferrule, the first graphite sealing ring and the graphite pressure plate, and the graphite pressure plate is locked to the second connecting portion of the first wiring tube body and the fourth connecting portion of the second wiring tube body through the pressure plate locking nut.

[0009] Furthermore, a glue injection hole is provided in the middle of the first wiring tube body and the second wiring tube body, and a glue injection hole sealing screw is provided in the glue injection hole. A third graphite sealing ring is provided between the glue injection hole sealing screw and the first wiring tube body and the second wiring tube body.

[0010] Furthermore, the first graphite sealing ring, the second graphite sealing ring and the third graphite sealing ring all use flexible graphite gaskets.

[0011] A composite sealed ultra-high temperature steel armor cable wiring method, which is implemented based on the composite sealed ultra-high temperature steel armor cable wiring tube, comprises:

[0012] The first cable end cable and the second cable end cable of the ultra-high temperature steel armored cable to be connected are respectively subjected to end processing to expose a preset length of bare copper core;

[0013] Installing a first high-temperature O-ring, a second high-temperature O-ring, and a first graphite sealing ring on the second wiring tube body, and installing a locking structure at the fourth connecting portion of the second wiring tube body;

[0014] Installing an insulating inner sleeve and a second high-temperature O-ring on the first wiring barrel body, and installing a locking structure at the second connecting portion of the first wiring barrel body;

[0015] Clean and crimp the bare copper cores and crimping tubes of the first cable end cable and the second cable end cable;

[0016] The wiring tube body is connected to the wiring tube body and the first graphite sealing ring is compressed. Then the first wiring tube body and the locking structure are locked and compressed step by step to complete the assembly of the composite sealed ultra-high temperature steel armor cable wiring tube.

[0017] Furthermore, a locking structure is installed at the fourth connecting portion of the second wiring tube body, including:

[0018] On the side of the fourth connecting part, the centralizing sleeve gland, the metal rear sleeve, the metal front sleeve, the graphite gland, the second graphite seal ring, the I-grade seal gland, the metal rear sleeve, the metal front sleeve, the first graphite seal ring, the graphite pressing plate, the pressing plate locking nut and the second joint pipe body are sequentially penetrated into the second cable end cable, all pieces are not locked, and the second joint pipe body is moved to the positioning size, the pressing plate locking nut, the graphite pressing plate, the first graphite seal ring, the metal front sleeve, the metal rear sleeve and the I-grade seal gland are locked in sequence, and the first graphite seal ring is compressed, and the first heavy metal double sleeve sealing structure is completed.

[0019] According to the assembly sequence, the second graphite seal ring, the graphite gland, the metal front sleeve, the metal rear sleeve and the centralizing sleeve gland are sequentially locked, and the second graphite seal ring is compressed, and the second heavy metal double sleeve sealing structure is completed.

[0020] Further, a locking structure is installed at the second connecting part of the first joint pipe body, comprising:

[0021] On the side of the second connecting part of the joint pipe body, the centralizing sleeve gland, the metal rear sleeve, the metal front sleeve, the graphite gland, the second graphite seal ring, the I-grade seal gland, the metal rear sleeve, the metal front sleeve, the first graphite seal ring, the graphite pressing plate, the pressing plate locking nut and the first joint pipe body are sequentially penetrated into the first cable end cable, and all pieces are not locked.

[0022] Further, the glue injection hole plugging bolt on the first joint pipe body and the second joint pipe body is opened, glue is injected into the glue injection hole, the glue injection hole on the second joint pipe body is opened for exhaust, and after the glue injection is completed, the glue injection hole is plugged and sealed by using the glue injection hole plugging bolt and the third graphite seal ring.

[0023] The present application has the following advantages due to the above technical scheme:

[0024] 1. The present application has the advantages of simple structure, good sealing effect, small space occupation, convenient assembly, high temperature resistance, static high pressure resistance and corrosion resistance.

[0025] 2. The present application uses metal front sleeve and metal rear sleeve for main sealing, and graphite seal ring and high temperature O-ring for auxiliary sealing, and due to the centralizing effect and sealing supplement of double or multiple metal front sleeve and metal rear sleeve, the structure is stable, the sealing effect is excellent, and the temperature resistance is high. In the working condition of ultra-high temperature, static high pressure and special corrosive medium, the reliability of the present application is greatly improved, avoiding the short circuit and even damage of the ultra-high temperature electric submersible pump unit caused by leakage, and ensuring the stability of the ultra-high temperature electric submersible pump unit in the integrated injection and production technology. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 1 is a schematic diagram of the overall structure of a composite-sealed ultra-high-temperature steel-armored cable connection pipe according to an embodiment of the present invention;

[0027] Figure 2 Schematic diagram of a first cable end cable and a second cable end cable of an ultra-high temperature steel armored cable to be connected after end processing in an embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of the second wiring tube body and the locking structure in an embodiment of the present invention;

[0029] Figure 4 Schematic diagram of wiring an ultra-high temperature steel armored cable through a first wiring tube body, a second wiring tube body, and a locking structure in an embodiment of the present invention;

[0030] Reference numerals:

[0031] 1-First wiring tube body, 2-Second wiring tube body, 3-Level I sealing cover, 4-Graphite pressure plate, 5-Pressure plate locking nut, 6-Graphite pressure cover, 7-Ring cover for straightening sleeve, 8-Glue injection hole sealing screw, 9-Insulating inner sleeve, 10-First high-temperature O-ring, 11-Second high-temperature O-ring, 12-First graphite sealing ring, 13-Third graphite sealing ring, 14-Second graphite sealing ring, 15-Metal front ferrule, 16-Metal rear ferrule, 17-First cable end, 18-Second cable end. DETAILED DESCRIPTION

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of the present invention.

[0033] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0034] In one embodiment of the present invention, a composite sealed ultra-high temperature steel armored cable connection pipe is provided for connecting ultra-high temperature cables, and is particularly suitable for connecting ultra-high temperature steel armored cables used in the steam injection and production (HUFF-PUFF) technology of offshore oil fields. In this embodiment, Figures 1 to 4As shown, the wiring tube includes:

[0035] The first wiring tube body 1 is sleeved on the first cable end 17 of the ultra-high temperature steel armored cable to be connected, and has an insulating inner sleeve 9 disposed therein and a first connecting portion and a second connecting portion; wherein the first connecting portion adopts an open groove structure, and the second connecting portion adopts a boss structure;

[0036] The second wiring tube body 2 is sleeved on the second cable end 18 of the ultra-high temperature steel armored cable to be connected, and has a third connecting portion and a fourth connecting portion. The first connecting portion is sleeved on the third connecting portion and is installed in conjunction with the first connecting portion via the third connecting portion to connect the first cable end 17 and the second cable end 18 of the ultra-high temperature steel armored cable to be connected. The third connecting portion and the fourth connecting portion both adopt a boss structure.

[0037] The locking structure is connected to the second connection portion of the first wiring barrel body 1 and the fourth connection portion of the second wiring barrel body 2 respectively, and locks the first wiring barrel body 1 and the second wiring barrel body 2 at the connection of the ultra-high temperature steel armor cable.

[0038] In a feasible embodiment, a second high-temperature O-ring 11 is provided inside the second connection portion of the first wiring tube body 1 to seal between the first wiring tube body 1 and the ultra-high-temperature steel armored cable.

[0039] In one feasible embodiment, a first high-temperature O-ring 10 and a first graphite sealing ring 12 are disposed outside the third connection portion of the second wiring barrel body 2 to seal the connection between the first and second wiring barrel bodies 1 and 2. A second high-temperature O-ring 11 is disposed inside the fourth connection portion of the second wiring barrel body 2 to seal the connection between the second wiring barrel body 2 and the ultra-high-temperature steel armored cable.

[0040] In this embodiment, a glue injection hole is provided in the middle of the first wiring tube body 1 and the second wiring tube body 2. A glue injection hole sealing screw 8 is provided in the glue injection hole, and a third graphite sealing ring 13 is provided between the glue injection hole sealing screw 8 and the first wiring tube body 1 and the second wiring tube body 2.

[0041] In a feasible embodiment, the locking structure includes a level I sealing cover 3, a graphite pressure plate 4, a pressure plate locking nut 5, a graphite pressure cover 6, a straightening sleeve cover 7, a first graphite sealing ring 12, a second graphite sealing ring 14, a metal front sleeve 15 and a metal rear sleeve 16.

[0042] The straightening ferrule gland 7 is away from the first wiring tube body 1 or the second wiring tube body 2 to be locked, and is located on the inner side of the straightening ferrule gland 7. A metal rear ferrule 16, a metal front ferrule 15, a graphite gland 6, a second graphite sealing ring 14 and a level I sealing gland 3 are sequentially arranged. A metal rear ferrule 16, a metal front ferrule 15, a first graphite sealing ring 12 and a graphite pressure plate 4 are sequentially arranged on the inner side of the level I sealing gland 3. The graphite pressure plate 4 is locked to the second connection part of the first wiring tube body 1 and the fourth connection part of the second wiring tube body 2 through a pressure plate locking nut 5.

[0043] In the above embodiments, the first high-temperature O-ring 10 and the second high-temperature O-ring 11 are both made of materials such as fluororubber, perfluoroether, Aflas or PTFE, and can also be replaced by spring-energized sealing rings, two Teflon half rings or piston seals, which are not specifically limited here.

[0044] In each of the above embodiments, the first graphite sealing ring 12, the second graphite sealing ring 14, and the third graphite sealing ring 13 are all made of flexible graphite gaskets. Flexible graphite, also known as expanded graphite, is highly elastic, has good compression properties, is chemically stable, has excellent sealing properties, and is resistant to high temperatures and corrosion. In this embodiment, it provides a good auxiliary sealing function.

[0045] In summary, the composite sealed ultra-high temperature steel armored cable connection pipe of the present invention has the advantages of simple structure, small space occupation, convenient assembly, good sealing effect, high temperature resistance and corrosion resistance.

[0046] In one embodiment of the present invention, a composite sealed ultra-high temperature steel armor cable wiring method is provided. The wiring method is implemented based on the composite sealed ultra-high temperature steel armor cable wiring tube in the above embodiments. Specifically, in this embodiment, Figures 2 to 4 As shown, the wiring method includes the following steps:

[0047] 1) Performing end treatment on the first cable end cable and the second cable end cable of the ultra-high temperature steel armored cable to be connected, respectively, to expose a preset length of bare copper core;

[0048] Specifically, the outer armor is removed to expose the steel pipe sheath, a preset length of the steel pipe is removed to expose the composite insulation layer, and then a preset length of the composite insulation layer is removed to expose the bare copper core of the preset length, and the ends of the steel pipe and the composite insulation layer are processed into pencil heads, such as Figure 1 As shown;

[0049] 2) Installing the first high-temperature O-ring 10, the second high-temperature O-ring 11, and the first graphite sealing ring 12 on the second wiring tube body 2, and installing a locking structure at the fourth connection portion of the second wiring tube body 2;

[0050] Specifically, on the fourth connection portion side of the second wiring tube body 2, the straightening ferrule gland 7, the metal rear ferrule 16, the metal front ferrule 15, the graphite gland 6, the second graphite sealing ring 14, the level I sealing gland 3, the metal rear ferrule 16, the metal front ferrule 15, the first graphite sealing ring 12, the graphite pressure plate 4, the pressure plate locking nut 5 and the second wiring tube body 2 are sequentially inserted into the second cable end cable, all parts are not locked, and the second wiring tube body 2 is moved to the positioning size, and the pressure plate locking nut 5, the graphite pressure plate 4, the first graphite sealing ring 12, the metal front ferrule 15, the metal rear ferrule 16 and the level I sealing gland 3 are preferentially locked in order, and the first graphite sealing ring 12 is compressed (preferably compressed by 2 mm in this embodiment) to complete the first heavy metal double ferrule sealing structure on the side of the second wiring tube body 2;

[0051] Then, the second graphite sealing ring 14, the graphite gland 6, the metal front ferrule 15, the metal rear ferrule 16 and the straightening ferrule gland 7 are tightened step by step in the assembly order, and the second graphite sealing ring 14 is compressed (preferably by 2 mm in this embodiment) to complete the second heavy metal double ferrule sealing structure on the side of the second wiring tube body 2;

[0052] In this embodiment, through the combined action of the above-mentioned step-by-step locking and compression, a composite sealing structure is formed that combines a double metal ferrule seal and a double graphite seal with a high-temperature O-ring as an auxiliary seal.

[0053] 3) Install the insulating inner sleeve 9 and the second high-temperature O-ring 11 on the first wiring barrel body 1, and install a locking structure at the second connecting portion of the first wiring barrel body 1;

[0054] Specifically, on the second connection part side of the wiring tube body 1, the straightening ferrule gland 7, the metal rear ferrule 16, the metal front ferrule 15, the graphite gland 6, the second graphite sealing ring 14, the level I sealing gland 3, the metal rear ferrule 16, the metal front ferrule 15, the first graphite sealing ring 12, the graphite pressure plate 4, the pressure plate locking nut 5 and the first wiring tube body 1 are sequentially inserted into the first cable end cable, and all parts are not locked;

[0055] 4) Clean and crimp the bare copper core and crimping tube of the first cable end cable and the second cable end cable;

[0056] Specifically, the bare copper core and the crimping tube of the first cable end cable and the second cable end cable are cleaned and crimped with acetone, and then wrapped with high-temperature resistant PI tape and high-temperature resistant raw tape in sequence to ensure connection, insulation and sealing;

[0057] 5) Connect the wiring tube body 1 to the wiring tube body 2 and compress the first graphite sealing ring 12 (preferably by 2 mm in this embodiment). Then, follow the locking sequence of the second cable end in step 2) to tighten and compress the first wiring tube body 1 and the locking structure step by step, completing the assembly of the composite sealed ultra-high temperature steel armored cable wiring tube.

[0058] In the above embodiment, after assembly is complete, if site conditions permit, the glue injection hole plugging bolts 8 on the first and second wiring tube bodies 1, 2 are opened, and glue is injected into the injection holes using a tool. The glue injection holes on the second wiring tube body 2 are then opened for venting. After the glue injection is completed, the glue injection hole plugging bolts 8 and the third graphite sealing ring 13 are used to plug and seal the injection holes, thereby completing the closure of the composite sealed ultra-high temperature steel armor cable wiring tube. This composite sealing structure, primarily based on the dual metal front and rear ferrules, is supplemented by multiple graphite sealing rings and high-temperature O-rings, thereby achieving the connection and sealing of the ultra-high temperature cable. If site conditions prohibit this, the glue injection operation is not performed, and the glue injection holes are not machined.

[0059] The injection medium includes but is not limited to high temperature resistant sealants, oils, fats, insulating varnishes and compressed inert gases.

[0060] In the above step 1), after removing the outer armor and exposing the steel pipe sheath, a straightener can be used to straighten the first cable end cable and the second cable end cable by about 300 mm to ensure that the metal front ferrule and the metal rear ferrule can pass flexibly.

[0061] In the above step 4), before crimping and insulation treatment, the bare copper core and the crimping tube are cleaned with acetone. After the acetone evaporates, the crimping tube is connected to the bare copper cores at both ends, and manual hydraulic pliers are used to crimp twice inward from both ends of the crimping tube; in the insulation treatment, first use high-temperature resistant raw tape to fill the depressions in the composite insulation layer and the crimping tube, and then spirally wrap it in forward and reverse directions until it is close to the outer diameters on both sides. Use high-temperature resistant PI tape to spirally wrap the high-temperature resistant raw tape filler from the left side, and wrap three layers in sequence with an overlap rate of 50-60%. Use high-temperature resistant raw tape again to spirally wrap it from the middle position of the crimping tube to both ends and slightly stretch it with an overlap rate of 50-60%. Wrap it in 3 layers in total, covering 15mm of the steel pipe. After the overall winding is completed, there shall be no abnormal protrusions or depressions.

[0062] In the above step 5), after the second high-temperature O-ring 10 and the insulating inner sleeve 9 are pre-installed on the first wiring tube body 1, they are gradually put on the cable at the first cable end in accordance with the assembly sequence. After the crimping and insulation treatment of the cables at the first cable end and the second cable end are completed, the first wiring tube body 1 and the second wiring tube body 2 are first connected and sealed, and the first graphite sealing ring 12 is compressed by 2 mm. Then, under the joint action of the step-by-step locking and compression of the parts such as the straightening ferrule gland 7, the metal rear ferrule 16, the metal front ferrule 15, the graphite gland 6, the second graphite sealing ring 14, the first-level sealing gland 3, the metal rear ferrule 16, the metal front ferrule 15, the first graphite sealing ring 12, the graphite pressure plate 4 and the pressure plate locking nut 5, a composite sealing structure is formed that combines double metal ferrule seals and double graphite seals with a high-temperature O-ring as an auxiliary seal.

[0063] In the above embodiment, the material of the metal front ferrule 15 and the metal rear ferrule 16 changes with the material of the metal sheath of the armored cable, so as to achieve the purpose of having the same thermal expansion coefficient of the metal front ferrule 15, the metal rear ferrule 16 and the metal sheath of the armored cable due to the same material, thereby ensuring the sealing of the metal front ferrule and the metal rear ferrule.

[0064] In the above embodiment, the number of the metal front ferrule 15 and the metal rear ferrule 16 on each side of the first cable end cable and the second cable end cable includes but is not limited to two groups, wherein the inner metal front ferrule 15 and the metal rear ferrule 16 mainly play a sealing role, and the outer metal front ferrule 15 and the metal rear ferrule 16 mainly play a straightening role.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A composite sealed ultra-high temperature steel armored cable connection pipe, characterized in that: include: A first wiring tube body, which is sleeved on the first cable end of the ultra-high temperature steel armored cable to be connected, is provided with an insulating inner sleeve inside, and has a first connecting portion and a second connecting portion; The second wiring tube body is sleeved on the second cable end of the ultra-high temperature steel armored cable to be connected, and has a third connecting portion and a fourth connecting portion. The first connecting portion is sleeved on the third connecting portion. The third connecting portion cooperates with the first connecting portion to connect the first cable end and the second cable end of the ultra-high temperature steel armored cable to be connected. a locking structure connected to the second connecting portion and the fourth connecting portion, respectively, to lock the first wiring barrel body and the second wiring barrel body at the connection of the ultra-high temperature steel armor cable; The locking structure includes a level I sealing gland, a graphite pressure plate, a pressure plate locking nut, a graphite gland, a centering ferrule gland, a first graphite sealing ring, a second graphite sealing ring, a metal front ferrule, and a metal back ferrule; the centering ferrule gland is away from the first wiring tube body or the second wiring tube body to be locked, is located inside the centering ferrule gland, and is sequentially provided with the metal back ferrule, the metal front ferrule, the graphite gland, the second graphite sealing ring, and the level I sealing gland; the metal back ferrule, the metal front ferrule, the first graphite sealing ring, and the graphite pressure plate are sequentially provided inside the level I sealing gland; the graphite pressure plate is locked to the second connecting portion of the first wiring tube body and the fourth connecting portion of the second wiring tube body via the pressure plate locking nut; A second high-temperature O-ring is provided inside the second connection portion of the first wiring barrel body.

2. The composite sealed ultra-high temperature steel armored cable connection pipe according to claim 1, characterized in that: A first high-temperature O-ring and a first graphite sealing ring are provided on the outer side of the third connecting portion of the second wiring tube body, and a second high-temperature O-ring is provided on the inner side of the fourth connecting portion.

3. The composite sealed ultra-high temperature steel armor cable connection pipe according to claim 1, characterized in that: The first and second wiring tube bodies are both provided with glue injection holes in the middle, and glue injection hole sealing screws are provided in the glue injection holes. A third graphite sealing ring is provided between the glue injection hole sealing screws and the first and second wiring tube bodies.

4. The composite sealed ultra-high temperature steel armored cable connection pipe according to claim 3, characterized in that: The first graphite sealing ring, the second graphite sealing ring and the third graphite sealing ring all use flexible graphite gaskets.

5. A composite sealed ultra-high temperature steel armor cable wiring method, characterized in that: The method is implemented based on the composite sealed ultra-high temperature steel armored cable connection pipe according to any one of claims 1 to 4, comprising: The first cable end cable and the second cable end cable of the ultra-high temperature steel armored cable to be connected are respectively subjected to end processing to expose a preset length of bare copper core; Installing a first high-temperature O-ring, a second high-temperature O-ring, and a first graphite sealing ring on the second wiring tube body, and installing a locking structure at the fourth connecting portion of the second wiring tube body; Installing an insulating inner sleeve and a second high-temperature O-ring on the first wiring barrel body, and installing a locking structure at the second connecting portion of the first wiring barrel body; Clean and crimp the bare copper cores and crimping tubes of the first cable end cable and the second cable end cable; The wiring tube body is connected to the wiring tube body and the first graphite sealing ring is compressed. Then the first wiring tube body and the locking structure are locked and compressed step by step to complete the assembly of the composite sealed ultra-high temperature steel armor cable wiring tube.

6. The composite sealed ultra-high temperature steel armor cable connection method according to claim 5, characterized in that: A locking structure is installed at the fourth connecting portion of the second wiring barrel body, comprising: On the side of the fourth connection part, the straightening ferrule gland, metal rear ferrule, metal front ferrule, graphite gland, second graphite sealing ring, level I sealing gland, metal rear ferrule, metal front ferrule, first graphite sealing ring, graphite pressure plate, pressure plate locking nut and second wiring tube body are sequentially inserted into the cable at the second cable end. All parts are not locked, and the second wiring tube body is moved to the positioning size. The pressure plate locking nut, graphite pressure plate, first graphite sealing ring, metal front ferrule, metal rear ferrule and level I sealing gland are preferentially locked in order, and the first graphite sealing ring is compressed to complete the first heavy metal double ferrule sealing structure; According to the assembly sequence, the second graphite sealing ring, graphite gland, metal front ferrule, metal rear ferrule and straightening ferrule gland are tightened step by step, and the second graphite sealing ring is compressed to complete the second heavy metal double ferrule sealing structure.

7. The composite sealed ultra-high temperature steel armor cable connection method according to claim 5, characterized in that: A locking structure is installed at the second connecting portion of the first wiring barrel body, comprising: On the second connection part side of the wiring tube body, insert the straightening ferrule gland, metal rear ferrule, metal front ferrule, graphite gland, second graphite sealing ring, level I sealing gland, metal rear ferrule, metal front ferrule, first graphite sealing ring, graphite pressure plate, pressure plate locking nut and the first wiring tube body into the cable at the first cable end in sequence, and do not tighten all parts.

8. The composite sealed ultra-high temperature steel armor cable connection method according to claim 5, characterized in that: Open the glue injection hole sealing bolts on the first wiring tube body and the second wiring tube body, inject glue into the glue injection hole, open the glue injection hole on the second wiring tube body for exhaust, and after the glue injection is completed, use the glue injection hole sealing bolts and the third graphite sealing ring to block and seal the glue injection hole.

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