Photoelectric composite logging headstall and use method thereof

Abstract

The invention discloses a photoelectric composite logging headstall and a using method thereof. A riveting assembly is arranged between a composite cable core distribution short circuit and a torpedo shell. An optical fiber steel pipe is arranged in a through hole of the composite cable core distribution short circuit, one end of the optical fiber steel pipe extends into the riveting assembly, the other end of the optical fiber steel pipe extends into the bare optical fiber core sealing chamber, and a bare optical fiber is arranged in the optical fiber steel pipe; an optical fiber steel pipe sealing assembly is arranged at one end, close to the bare optical fiber core sealing chamber, of the through hole of the composite cable core distribution short circuit; the optical fiber steel pipe sealing assembly sleeves the optical fiber steel pipe; and the middle part of the hollow weak-point tension rod is reduced. The optical fiber steel pipe is sealed through the optical fiber steel pipe sealing assembly, underground protection of the optical fiber can be achieved under any condition, and the internal bare optical fiber is led out. According to the photoelectric composite logging headstall, the hollow weak point tension rod is arranged, the middle of the hollow weak point tension rod is subjected to diameter shrinkage design, and through accurate weak point design of the photoelectric composite logging headstall, accurate setting of the tension weak point is achieved, and meanwhile sealing protection is conducted on the penetrating bare optical fiber.

Description

Technical Field

[0001] The invention belongs to the technical field of oilfield optical fiber logging construction, and particularly relates to a photoelectric composite logging bridle and a use method thereof. Background Art

[0002] With the development of fiber optic logging technology, fiber optic detection and fiber optic sensing technology have gradually matured. When the existing photoelectric bridle is stuck in the downhole instrument to handle engineering accidents, it is necessary to pull it off from the weak point of the photoelectric bridle. At this time, the end face of the fiber optic steel pipe is exposed to the well fluid. Under the action of the well pressure, the well fluid enters the steel pipe and the downhole instrument, causing hundreds of meters of optical fiber to be flooded and cause significant losses.

[0003] The patent publication number is CN202731872U, and the name is a patent application for a cable acid corrosion weakness type bridle. It consists of an upper joint, a fixed bracket, an acid tube, a movable slider, an insulating cap, a banana plug, a lower joint, a cone, a clamping cap, an outer tube and a cap. There are cable holes in the middle of the upper joint, the movable slider, the lower joint, the cone and the clamping cap; the upper joint is fixedly connected to the fixed bracket, and the upper joint is buckled with the outer tube; there are two to four fixed brackets, corresponding to the acid tube; the movable slider is fixed in the middle of the outer tube; the lower joint is buckled with the outer tube; the lower joint is buckled with the cap; the clamping cap fixes the cone in the movable slider; two banana plugs are respectively welded to the two ends of the wire, but this patent application cannot achieve the precise setting of the downhole sensor sealing and tension weakness. Summary of the invention

[0004] In order to overcome the problems existing in the above-mentioned prior art, the purpose of the present invention is to provide a photoelectric composite logging bridle and a method of using the same, which can seal and protect the optical fiber steel pipe and the downhole sensor, achieve precise setting of the tensile weakness, and seal and protect the bare optical fiber passing through.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] A photoelectric composite well logging bridle, comprising:

[0007] A composite cable core distribution short circuit, one end of which is connected to a torpedo casing;

[0008] A bare optical fiber core sealed chamber, one end of which is connected to the composite cable core distribution short circuit, and the other end of which is connected to a hollow core weak point tension rod;

[0009] A composite cable core through-core sealing short-circuit, wherein the end of the composite cable core through-core sealing short-circuit is connected to the hollow core weak point tension rod;

[0010] Among them, a riveting assembly is arranged between the composite cable core distribution short-circuit and the torpedo shell; the composite cable core distribution short-circuit is provided with a through hole, and an optical fiber steel tube is arranged in the through hole of the composite cable core distribution short-circuit, one end of the optical fiber steel tube extends into the riveting assembly, and the other end extends into the bare optical fiber core sealing chamber, and a bare optical fiber is arranged in the optical fiber steel tube; an optical fiber steel tube sealing assembly is arranged at one end of the through hole of the composite cable core distribution short-circuit close to the bare optical fiber core sealing chamber, and the optical fiber steel tube sealing assembly is sleeved outside the optical fiber steel tube; the middle part of the hollow core weak point tension rod is reduced in diameter; the hollow core weak point tension rod and the composite cable core core sealing short-circuit are both provided with through capillary holes for passing the bare optical fiber.

[0011] Optionally, the composite cable core distribution short-circuit jacket is provided with a tension rod upper joint, the other end of the tension rod upper joint is sleeved outside the end of the hollow core weak point tension rod, and the bare optical fiber core sealing chamber is arranged in the middle of the tension rod upper joint; the other end of the hollow core weak point tension rod away from the tension rod upper joint is sleeved with a tension rod lower joint, and the other end of the tension rod lower joint is sleeved outside the end of the composite cable core core sealing short-circuit.

[0012] Optionally, the tension rod upper joint and the tension rod lower joint are connected via an anti-rotation locking sleeve.

[0013] Optionally, a malachite shell is provided on the outer side of the torpedo shell, and a gap is provided between the malachite shell and the outer wall of the composite cable core distribution short circuit, the outer wall of the tension rod upper joint and the outer wall of the tension rod lower joint, and a cable core is provided in the gap.

[0014] Optionally, a groove is provided on the outer side of the composite cable core distribution short circuit.

[0015] Optionally, the slot of the composite cable core distribution short circuit has a reduced diameter structure.

[0016] Optionally, the number of the cable cores is six, the number of the composite cable core distribution short-circuit slots is two, and three of the cable cores pass through each of the slots.

[0017] Optionally, six core sealing plug installation holes are distributed on the outer side of the composite cable core core sealing short circuit.

[0018] Optionally, sealing rings are provided at both ends of the hollow weak point tension rod.

[0019] A method for using a photoelectric composite logging bridle comprises the following steps:

[0020] S1: Pass the logging optoelectronic composite cable through the torpedo shell;

[0021] S2: Use a riveting assembly to rivet the two steel wire armor layers of the optoelectronic composite cable together, and then place the riveted assembly into the torpedo shell;

[0022] S3: Separate the cable core and optical fiber steel tube of the optoelectronic composite cable, pass the optical fiber steel tube through the composite cable core distribution short-circuit, divide the cable core into two groups, and lead them out from the outside of the composite cable core distribution short-circuit;

[0023] S4: The outer wall of the optical fiber steel tube and the short-circuit joint of the composite cable core are sealed by the optical fiber steel tube sealing assembly;

[0024] S5: Cut the fiber steel tube along the short-circuit end face of the composite cable core to expose the bare optical fiber inside, and pass the bare optical fiber through the bare optical fiber core sealing chamber;

[0025] S6: Pass the bare optical fiber through the capillary hole of the hollow weak point tension rod, pass the bare optical fiber through the composite cable core through the core sealing short-circuit, and lead the cable core out from the outside of the composite cable core through the core sealing short-circuit.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The present invention seals the optical fiber steel pipe through the optical fiber steel pipe sealing assembly, can realize downhole protection of the optical fiber under any circumstances, and lead out the internal bare optical fiber. The core sealing of the bare optical fiber is realized by the composite cable core through-core sealing short circuit, and the downhole instrument and optical fiber sensor can be sealed and protected under any circumstances. The present invention sets a hollow core weak point tension rod and reduces the diameter of the middle part. Through the precise weak point design of the photoelectric composite logging bridle, the optical fiber steel pipe sealing protection and the downhole sensor sealing structure are realized, and the bare optical fiber passing through is sealed and protected at the same time.

[0028] Furthermore, sealing rings are provided at both ends of the hollow weak point tension rod of the present invention, thereby realizing an overall sealing structure, protecting the bare optical fiber and making it work stably.

[0029] Furthermore, the composite cable core distribution short circuit of the present invention is provided with a slot to facilitate the passage of the cable core, and the slot has a reduced diameter structure to prevent the cable core from being scratched when the faucet shell is installed.

[0030] Furthermore, the present invention is provided with an anti-rotation lock sleeve, which can make the connection between the tension rod upper joint and the tension rod lower joint more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings described herein are for explanation purposes only and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the components in the drawings are only for illustration purposes to help understand the present invention, and are not intended to specifically limit the shapes and proportional dimensions of the components of the present invention. In the drawings:

[0032] Figure 1 It is a cross-sectional schematic diagram of the present invention;

[0033] Among them, 1-torpedo shell, 2-riveted assembly, 3-composite cable core distribution short-circuit, 4-optical fiber steel tube sealing assembly, 5-bare optical fiber core sealing chamber, 6-tension rod upper joint, 7-hollow core weak point tension rod, 8-anti-rotation lock sleeve, 9-tension rod lower joint, 10-composite cable core over-core sealing short-circuit, 11-mala faucet shell, 12-optical fiber steel tube, 13-cable core, 14-bare optical fiber. DETAILED DESCRIPTION

[0034] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in 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 embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0035] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0037] The present invention is described in detail below with reference to the accompanying drawings.

[0038] like Figure 1 As shown, a photoelectric composite logging bridle of the present invention comprises: a torpedo shell 1, a riveting assembly 2, a composite cable core distribution short circuit 3, an optical fiber steel pipe sealing assembly 4, a bare optical fiber core sealing chamber 5, a tension rod upper joint 6, a hollow core weak point tension rod 7, an anti-rotation locking sleeve 8, a tension rod lower joint 9, a composite cable core core sealing short circuit 10, a bridle shell 11, an optical fiber steel pipe 12, a cable core 13 and a bare optical fiber 14.

[0039] One end of the torpedo shell 1 is conical, and the torpedo shell 1 has a central through hole for passing the composite optical cable. The central through hole at the other end of the torpedo shell 1 away from the cone has an internal thread. The composite cable core distribution short circuit 3 is connected to the end of the central through hole of the torpedo shell 1 with an internal thread. A fixing groove is provided on the inner wall of the central through hole at the end of the torpedo shell 1 away from the cone for connecting the riveting assembly 2.

[0040] Both ends of the composite cable core distribution short circuit 3 have external threads. One end of the composite cable core distribution short circuit 3 is fixed to the internal thread of the torpedo shell 1 through the external thread, and the other end is sleeved with the optical fiber steel tube sealing assembly 4 and connected to the upper joint 6 of the tension rod. The center of the composite cable core distribution short circuit 3 has a through hole for passing the optical fiber steel tube 12, and the optical fiber steel tube sealing assembly 4 is used to seal the outer wall of the optical fiber steel tube 12. Optionally, the optical fiber steel tube sealing assembly 4 is made of rubber. The through hole of the composite cable core distribution short circuit 3 at one end away from the riveting assembly 2 has an internal thread, and the through hole of the composite cable core distribution short circuit 3 is connected to the bare optical fiber 14 through the internal thread.

[0041] The end face of the composite cable core distribution short circuit 3 has a sealing surface for sealing the optical fiber steel tube 12. The outer side of the composite cable core distribution short circuit 3 is provided with two slots for separating and leading out the six cable cores 13 of the optoelectronic composite cable and connecting them to the bridle instrument end. The slots of the composite cable core distribution short circuit 3 have a reduced diameter structure, which can prevent the cable core 13 from being scratched when the bridle housing 11 is installed.

[0042] The bare fiber core sealed chamber 5 has a through hole for passing the optical fiber steel tube 12. The end of the bare fiber core sealed chamber 5 is provided with an external thread. The bare fiber core sealed chamber 5 is connected to the composite cable core distribution short circuit 3 through the external thread thereon, and can press and fix the sealing ring outside the optical fiber steel tube 12 to form a seal on the outer wall of the steel tube. The other end of the bare fiber core sealed chamber 5 away from the optical fiber steel tube 12 is an open chamber, which is used to cut off the bare fiber exposed by the steel tube inside the chamber, and the modulated sealant is poured in the chamber to seal the bare fiber 14 and the end face of the optical fiber steel tube 12. The composite cable core distribution short circuit 3 and the bare fiber core sealed chamber 5 are installed in coordination to complete the sealing of the end face of the optical fiber steel tube 12 and realize the lead-out of the bare fiber 14.

[0043] The hollow weak point tension rod assembly comprises: a tension rod upper joint 6, a hollow weak point tension rod 7 and a tension rod lower joint 9.

[0044] The tension rod upper joint 6 can be connected to the composite cable core distribution short circuit 3 and the hollow core weak point tension rod 7 and form an outer seal for the bare optical fiber core sealing chamber 5.

[0045] One end of the inner side of the tension rod upper joint 6 is sleeved outside the composite cable core distribution short circuit 3, and the other end is sleeved outside the hollow core weak point tension rod 7. The tension rod upper joint 6 has an internal thread for connecting with the composite cable core distribution short circuit 3 and the hollow core weak point tension rod 7. The middle part of the tension rod upper joint 6 wraps the bare optical fiber core sealing chamber 5 inside for protection.

[0046] The hollow weak point tension rod 7 is used to accurately set the weak point breaking force and the core protection of the bare optical fiber 14. The hollow weak point tension rod 7 has a through capillary hole, and the bare optical fiber 14 can pass through the through capillary hole. Both ends of the hollow weak point tension rod 7 have external threads and sealing rings. The middle part of the hollow weak point tension rod 7 is reduced in diameter, which serves as a tensile weakness to control the weak point diameter to reach the specified tensile value and ensure the precise control of the weak point breaking force. During normal use, the bare optical fiber 14 is effectively protected inside the tension rod.

[0047] The tension rod lower joint 9 is used to connect the hollow tension rod and the composite cable core through-core sealing short-circuit 10, and to cast and seal the middle chamber. The inner side of the tension rod lower joint 9 is sleeved on the outside of the hollow weak point tension rod 7, and the outer side of the tension rod lower joint 9 is connected to the anti-rotation lock sleeve 8, and the other end of the anti-rotation lock sleeve 8 is connected to the outer side of the tension rod upper joint 6. The other end of the tension rod lower joint 9 is connected to the end of the composite cable core through-core sealing short-circuit 10 through its internal thread. The middle chamber of the tension rod lower joint 9 is used to cast sealant to achieve the sealing of the instrument end of the bare optical fiber 14 led out of the bridle, and protect the downhole instruments.

[0048] The composite cable core through-core sealing short-circuit 10 is used to lead out the cable core and the bare optical fiber 14 to seal and connect downhole instruments and optical fiber sensors. The composite cable core through-core sealing short-circuit 10 is provided with a through capillary hole, and the bare optical fiber 14 can pass through the through capillary hole of the composite cable core through-core sealing short-circuit 10. Six through-core sealing plug installation holes are distributed on the outside of the composite cable core through-core sealing short-circuit 10, which are used for the six cable cores 13 to apply rubber sleeves, copper plugs, through-core sealing plugs, and through-core sealing connection to downhole instruments. The outer periphery of the through-core sealing plug installation hole is designed with an external thread, which is used to install the faucet shell 11 to protect the overall structure inside. The faucet shell 11 is provided with a sealing silicone grease filling hole and a pressure balance hole, and the other end of the composite cable core through-core sealing short-circuit 10 is connected to the downhole instrument.

[0049] Example

[0050] Combine the following Figure 1 The specific implementation modes of the present invention are further described.

[0051] The photoelectric composite well logging bridle of the present invention, when used:

[0052] First, pass the logging optoelectronic composite cable through the torpedo shell 1, leaving a sufficiently long cable core, and use the riveting assembly 2 to rivet the two layers of steel wire armor of the optoelectronic composite cable together. Then put the riveted assembly into the torpedo shell 1. Its tensile strength is basically the same as that of the optoelectronic composite cable, forming a transition from the optoelectronic composite cable to the bridle.

[0053] Separate the six cable cores 13 and the optical fiber steel tube 12 of the optoelectronic composite cable, pass the optical fiber steel tube 12 through the central through hole of the composite cable core distribution short-circuit 3, and divide the six cable cores 13 into two groups, leading out from the two slots of the composite cable core distribution short-circuit 3. The composite cable core distribution short-circuit 3 and the torpedo shell 1 are threadedly connected, and the torpedo shell 1 is rotated, and the optoelectronic composite cable and the composite cable core distribution short-circuit 3 are kept stationary to prevent the cable core from being entangled. After the threads are tightened, the anti-rotation screws of the rivet assembly 2 and the composite cable core distribution short-circuit 3 are installed.

[0054] The sealing surface of the composite cable core distribution short circuit 3 is used to seal the outer wall of the optical fiber steel tube 12, and the optical fiber steel tube sealing component 4 is passed through the optical fiber steel tube 12 and placed into the sealing surface of the composite cable core distribution short circuit 3. The end surface of the composite cable core distribution short circuit 3 is cut off by a tube cutter to expose the bare optical fiber 14 inside. The bare optical fiber core sealing chamber 5 is passed through the bare fiber, and the composite cable core distribution short circuit 3 is threadedly connected, and the optical fiber steel tube sealing component 4 is pressed to form a seal.

[0055] The bare optical fiber core sealing chamber 5 has an open chamber inside. The prepared resin sealant is added into the bare optical fiber core sealing chamber 5. The curing time is 30 minutes and the structural strength is reached in 12 hours. After curing, a seal is formed around the bare optical fiber 14 and the end face of the optical fiber steel tube 12.

[0056] The upper joint 6 of the tension rod is threadedly connected to the composite cable core distribution short circuit 3 and sealed by a sealing ring, and the anti-rotation screw is installed. The bare optical fiber 14 passes through the through capillary hole of the hollow-core weak point tension rod 7, and the hollow-core weak point tension rod 7 with a sealing ring is threadedly connected to the upper joint 6 of the tension rod. The bare optical fiber 14 passes through the lower joint 9 of the tension rod, and is threadedly connected to the hollow-core weak point tension rod 7, and the anti-rotation lock sleeve 8 is installed to bundle and fix it.

[0057] Pour the prepared sealant in the middle chamber of the tension rod lower joint 9, pass the bare optical fiber 14 through the composite cable core through the core sealing short-circuit 10, connect the composite cable core through the core sealing short-circuit 10 with the tension rod lower joint 9 through threads and seal, and install the anti-rotation screw, wait for the sealant to solidify, and the bare optical fiber 14 can be connected to the downhole optical fiber sensor. The 6 cable cores 13 should be led out with rubber sleeves, copper plugs, and core sealing plugs to connect the downhole instruments.

[0058] Install the bridle shell, pass the bridle shell 11 through the overall installation structure, and thread it with the composite cable core sealing short-circuit 10 to protect the overall structure. Add sealing silicone grease to form an insulating seal for the 6 cable cores 13 to complete the production of the optoelectronic composite bridle.

[0059] During normal logging construction, the optical fiber in the optoelectronic composite bridle is sealed and protected in the structure. When dealing with engineering accidents, the card handling requires the breaking force of the hollow core weak point tensile rod 7 to be reached. The weak point is pulled and the bare optical fiber 14 is broken to recover the optical cable. At this time, the end face of the optical fiber steel pipe 12 is sealed and protected by the sealant, and the downhole instrument is protected by the sealant in the lower joint to ensure the sealing of the optical fiber steel pipe 12 and the downhole instrument.

[0060] Unless otherwise specified, the device elements involved in the above embodiments are all conventional device elements, and the structural settings, working modes or control modes involved are all conventional settings, working modes or control modes in the art unless otherwise specified.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the present invention by ordinary technicians in the field should be included in the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. A photoelectric composite logging bridle, characterized in that: include: A composite cable core distribution short circuit (3), one end of which is connected to a torpedo casing (1); A bare optical fiber core sealed chamber (5), one end of the bare optical fiber core sealed chamber (5) is connected to the composite cable core distribution short circuit (3), and the other end is connected to a hollow core weak point tension rod (7); A composite cable core sealing short circuit (10), wherein the end of the composite cable core sealing short circuit (10) is connected to the hollow core weak point tension rod (7); Wherein, a riveting assembly (2) is arranged between the composite cable core distribution short circuit (3) and the torpedo shell (1); the composite cable core distribution short circuit (3) is provided with a through hole, and an optical fiber steel tube (12) is arranged in the through hole of the composite cable core distribution short circuit (3), one end of the optical fiber steel tube (12) extends into the riveting assembly (2), and the other end extends into the bare optical fiber core sealing chamber (5), and a bare optical fiber (14) is arranged in the optical fiber steel tube (12); an optical fiber steel tube sealing assembly (4) is arranged at one end of the through hole of the composite cable core distribution short circuit (3) close to the bare optical fiber core sealing chamber (5), and the optical fiber steel tube sealing assembly (4) is sleeved outside the optical fiber steel tube (12); the middle part of the hollow core weak point tension rod (7) is reduced in diameter; the hollow core weak point tension rod (7) and the composite cable core through-core sealing short circuit (10) are both provided with through capillary holes for passing the bare optical fiber (14).

2. The photoelectric composite logging bridle according to claim 1, characterized in that: The composite cable core distribution short-circuit (3) is provided with a tension rod upper joint (6) on its outer sleeve, and the other end of the tension rod upper joint (6) is sleeved outside the end of the hollow core weak point tension rod (7), and the bare optical fiber core sealing chamber (5) is arranged in the middle of the tension rod upper joint (6); the other end of the hollow core weak point tension rod (7) away from the tension rod upper joint (6) is sleeved with a tension rod lower joint (9), and the other end of the tension rod lower joint (9) is sleeved outside the end of the composite cable core core sealing short-circuit (10).

3. The photoelectric composite logging bridle according to claim 2, characterized in that: The tension rod upper joint (6) and the tension rod lower joint (9) are connected via an anti-rotation lock sleeve (8).

4. The photoelectric composite logging bridle according to claim 2, characterized in that: The outer side of the torpedo shell (1) is provided with a faucet shell (11), and a gap is provided between the faucet shell (11) and the outer wall of the composite cable core distribution short circuit (3), the outer wall of the tension rod upper joint (6) and the outer wall of the tension rod lower joint (9), and a cable core (13) is provided in the gap.

5. The photoelectric composite logging bridle according to claim 4, characterized in that: The outer side of the composite cable core distribution short circuit (3) is provided with a slot.

6. The photoelectric composite logging bridle according to claim 5, characterized in that: The slotted portion of the composite cable core distribution short-circuit (3) has a reduced diameter structure.

7. The photoelectric composite logging bridle according to claim 5, characterized in that: The number of the cable cores (13) is six, the number of the slots of the composite cable core distribution short circuit (3) is two, and three of the cable cores (13) pass through each of the slots.

8. The photoelectric composite logging bridle according to claim 7, characterized in that: Six core sealing plug installation holes are distributed on the outer side of the composite cable core core sealing short circuit (10).

9. The photoelectric composite logging bridle according to claim 1, characterized in that: Both ends of the hollow weak point tension rod (7) are provided with sealing rings.

10. The method for using the photoelectric composite logging bridle according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1: Pass the logging optoelectronic composite cable through the torpedo shell (1); S2: using a riveting assembly (2) to rivet two layers of steel wire armor of the optoelectronic composite cable together, and then placing the riveted assembly into the torpedo casing (1); S3: Separate the cable core (13) and the optical fiber steel tube (12) of the optoelectronic composite cable, pass the optical fiber steel tube (12) through the composite cable core distribution short circuit (3), divide the cable core (13) into two groups, and lead them out from the outside of the composite cable core distribution short circuit (3); S4: sealing the junction between the outer wall of the optical fiber steel tube (12) and the composite cable core distribution short circuit (3) through the optical fiber steel tube sealing component (4); S5: Cutting the optical fiber steel tube (12) along the end face of the composite cable core distribution short circuit (3) to expose the bare optical fiber (14) inside, and passing the bare optical fiber (14) through the bare optical fiber core sealing chamber (5); S6: Pass the bare optical fiber (14) through the penetrating capillary hole of the hollow weak point tension rod (7), pass the bare optical fiber (14) through the composite cable core through-core sealing short-circuit (10), and lead the cable core (13) out from the outside of the composite cable core through-core sealing short-circuit (10).

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