Opto-electric composite logging collar and method of using same

Abstract

The application discloses a photoelectric composite logging crown block and a use 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 extends into a bare optical fiber core sealing chamber, and bare optical fiber is arranged in the optical fiber steel pipe; an optical fiber steel pipe 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, the optical fiber steel pipe sealing assembly is sleeved outside the optical fiber steel pipe; and the middle part of the hollow weak point tension rod is reduced in diameter. The optical fiber steel pipe is sealed through the optical fiber steel pipe sealing assembly, downhole protection of the optical fiber under any condition can be realized, and the internal bare optical fiber is led out. The hollow weak point tension rod is arranged, the middle part is designed to be reduced in diameter, the photoelectric composite logging crown block is accurately designed, the accurate setting of the tension weak point is realized, and the passing bare optical fiber is sealed and protected.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of optical fiber logging construction in oil field, and particularly relates to an optical-electric composite logging head and a use method thereof. BACKGROUND

[0002] With the development of optical fiber logging technology and the gradual maturity of optical fiber detection and optical fiber sensing technology, the existing optical-electric composite logging head needs to be pulled off from the weak point of the optical-electric composite logging head when the downhole instrument is stuck and the engineering accident is processed, at which time the end surface of the optical fiber steel tube is exposed to the well fluid, and the well fluid enters the steel tube and the downhole instrument under the action of the pressure in the well, causing a great loss of hundreds of meters of optical fiber.

[0003] Patent application No. CN202731872U, entitled Cable acid corrosion weak point type logging head, is composed of an upper connector, a fixed support, an acid pipe, a movable slider, an insulating cap, a banana plug, a lower connector, a clamping cone, a compression cap, an outer tube and a cap. There are cable holes in the upper connector, the movable slider, the lower connector, the clamping cone and the compression cap. The upper connector is fixedly connected with the fixed support, and the upper connector is connected with the outer tube in a snap-fit manner. The fixed support is two to four, corresponding to the clamping acid pipe. The movable slider is fixed in the middle of the outer tube. The lower connector is connected with the outer tube in a snap-fit manner. The lower connector is connected with the cap in a snap-fit manner. The compression cap fixes the clamping cone in the movable slider. Two banana plugs are respectively welded at the two ends of the wire, but the patent application cannot realize the sealing of the downhole sensor and the accurate setting of the tension weak point. SUMMARY

[0004] In order to overcome the problems existing in the prior art, the purpose of the present application is to provide an optical-electric composite logging head and a use method thereof, which can seal and protect the optical fiber steel tube and the downhole sensor, realize the accurate setting of the tension weak point, and seal and protect the bare optical fiber.

[0005] To achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0006] An optical-electric composite logging head, comprising:

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

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

[0009] A composite cable core passing core sealing short circuit, the end of which is connected with the hollow weak point tension rod;

[0010] The 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 pipe is arranged in the 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 extends into the bare optical fiber core sealing chamber, and a bare optical fiber is arranged in the optical fiber steel pipe; the end of the through hole of the composite cable core distribution short circuit close to the bare optical fiber core sealing chamber is provided with an optical fiber steel pipe sealing assembly, and the optical fiber steel pipe sealing assembly is sleeved outside the optical fiber steel pipe; the middle part of the hollow weak point tension rod is reduced in diameter; the hollow weak point tension rod and the composite cable core passing core sealing short circuit are both provided with a through capillary hole for passing the bare optical fiber.

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

[0012] Optionally, the tension rod upper connector and the tension rod lower connector are connected through an anti-rotation lock sleeve.

[0013] Optionally, the outside of the torpedo shell is sleeved with a swivel head shell, a gap is arranged between the outer wall of the composite cable core distribution short circuit, the outer wall of the tension rod upper connector and the outer wall of the tension rod lower connector, and a cable core is arranged in the gap.

[0014] Optionally, the outside of the composite cable core distribution short circuit is provided with a slot.

[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 slots of the composite cable core distribution short circuit is two, and three cable cores pass through each slot.

[0017] Optionally, the outside of the composite cable core passing core sealing short circuit is distributed with six core sealing plug mounting holes.

[0018] Optionally, the two ends of the hollow weak point tension rod are both provided with a sealing ring.

[0019] A use method of an optical-electric composite logging swivel head, comprising the following steps:

[0020] S1: passing the logging optical-electric composite cable through the torpedo shell;

[0021] S2: the two layers of steel wire armor of the photoelectric composite cable are riveted together by using a riveting assembly, and then the riveted assembly is placed into the torpedo shell;

[0022] S3: the cable core and the optical fiber steel tube of the photoelectric composite cable are separated, the optical fiber steel tube is distributed through the composite cable core distribution short circuit, the cable core is divided into two groups, and the cable core is led out from the outside of the composite cable core distribution short circuit;

[0023] S4: the optical fiber steel tube outer wall and the composite cable core distribution short circuit are sealed through the optical fiber steel tube sealing assembly;

[0024] S5: the optical fiber steel tube is cut along the end face of the composite cable core distribution short circuit, the internal bare optical fiber is exposed, and the bare optical fiber is distributed through the bare optical fiber core sealing chamber;

[0025] S6: the bare optical fiber is distributed through the through hole of the hollow weak point tension rod, the bare optical fiber is distributed through the composite cable core core sealing short circuit, and the cable core is led out from the outside of the composite cable core core sealing short circuit.

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

[0027] The present application seals the optical fiber steel tube through the optical fiber steel tube sealing assembly, can realize the downhole protection of the optical fiber in any case, and leads out the internal bare optical fiber. The core sealing of the bare optical fiber is realized through the composite cable core core sealing short circuit, and the downhole instrument and the optical fiber sensor can be sealed and protected in any case. The hollow weak point tension rod is provided in the present application, and the middle part is designed to be reduced in diameter. Through the accurate weak point design of the photoelectric composite logging yoke, the optical fiber steel tube sealing protection and the downhole sensor sealing structure are realized, the accurate setting of the tension weak point is realized, and the passing bare optical fiber is sealed and protected.

[0028] Further, the hollow weak point tension rod of the present application is provided with a sealing ring at both ends, realizes the overall sealing structure, protects the bare optical fiber, and makes the bare optical fiber work stably.

[0029] Further, the composite cable core distribution short circuit of the present application is provided with a slot, which can facilitate the passing of the cable core, and the slot has a reduced diameter structure, which can avoid the scratching of the cable core when the yoke shell is installed.

[0030] Further, the present application is provided with an anti-rotation lock sleeve, which can make the connection between the upper joint of the tension rod and the lower joint of the tension rod more stable. DETAILED DESCRIPTION

[0031] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present application in any way. In addition, the shapes and proportions of the components in the drawings are only illustrative and are used to help understand the present application, and are not specific limitations on the shapes and proportions of the components. In the drawings:

[0032] Figure 1 A profile diagram of the present application;

[0033] Wherein, 1 - torpedo shell, 2 - riveting assembly, 3 - composite cable core distribution short, 4 - optical fiber steel tube sealing assembly, 5 - bare optical fiber core sealing chamber, 6 - upper joint of tension rod, 7 - hollow weak point tension rod, 8 - anti-rotation lock sleeve, 9 - lower joint of tension rod, 10 - composite cable core core passing sealing short, 11 - male head shell, 12 - optical fiber steel tube, 13 - cable core, 14 - bare optical fiber. DETAILED DESCRIPTION

[0034] In order for those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the present application.

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

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0037] The present application will be described in detail below in combination with the drawings.

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

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

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

[0041] The end face of the composite cable core distribution short connector 3 has a sealing surface for sealing the optical fiber steel pipe 12. Two grooves are arranged on the outer side of the composite cable core distribution short connector 3 for separating and leading out the six cable cores 13 of the optical cable to the halter instrument end. The grooves of the composite cable core distribution short connector 3 have a reduced diameter structure, which can prevent the cable core 13 from being scratched when the halter shell 11 is installed.

[0042] The bare optical fiber core sealing chamber 5 has a through hole for passing through the optical fiber steel pipe 12, and the end of the bare optical fiber core sealing chamber 5 is provided with external threads. The bare optical fiber core sealing chamber 5 is connected with the composite cable core distribution short connector 3 through the external threads thereon, can press and fix the sealing ring outside the optical fiber steel pipe 12, and forms the sealing of the outer wall of the steel pipe. The other end of the bare optical fiber core sealing chamber 5 away from the optical fiber steel pipe 12 is an open chamber for cutting the bare fiber exposed by the steel pipe inside the chamber, pouring the sealing agent in the chamber, and sealing the bare optical fiber 14 around and the end face of the optical fiber steel pipe 12. The bare optical fiber core sealing chamber 5 is installed in cooperation with the composite cable core distribution short connector 3 to complete the sealing of the end face of the optical fiber steel pipe 12 and realize the leading out of the bare optical fiber 14.

[0043] The hollow weak point tension rod assembly includes a tension rod upper connector 6, a hollow weak point tension rod 7 and a tension rod lower connector 9.

[0044] The tension rod upper connector 6 can connect the composite cable core distribution short connector 3 with the hollow weak point tension rod 7 and form the peripheral sealing of the bare optical fiber core sealing chamber 5.

[0045] The one end of the tension rod upper joint 6 is sleeved outside the composite cable core distribution short joint 3, and the other end is sleeved outside the hollow weak point tension rod 7. The tension rod upper joint 6 has internal threads for connecting the composite cable core distribution short joint 3 and the hollow 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 for accurately setting the weak point tension and protecting the bare optical fiber 14. The hollow weak point tension rod 7 has a through capillary hole through which the bare optical fiber 14 can pass, and 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, serving as a tension weak point, controlling the weak point diameter to reach a specified tension value, and ensuring accurate control of the weak point tension, and the bare optical fiber 14 is effectively protected inside the tension rod during normal use.

[0047] The tension rod lower joint 9 is used for connecting the hollow tension rod with the composite cable core through-seal short joint 10 and pouring sealant in the middle chamber. The inner side of the tension rod lower joint 9 is sleeved outside the hollow weak point tension rod 7, the outer side of the tension rod lower joint 9 is connected with the anti-rotation lock sleeve 8, the other end of the anti-rotation lock sleeve 8 is connected with the outer side of the tension rod upper joint 6. The other end of the tension rod lower joint 9 is connected with the end of the composite cable core through-seal short joint 10 through the internal threads. The chamber in the middle of the tension rod lower joint 9 is used for pouring sealant, realizing the sealing of the bridle leading-out bare optical fiber 14 instrument end, and protecting the downhole instrument.

[0048] The composite cable core through-seal short joint 10 is used for connecting the cable core and the bare optical fiber 14 to lead out and seal the downhole instrument and the optical fiber sensor. The composite cable core through-seal short joint 10 is provided with a through capillary hole through which the bare optical fiber 14 can pass. The outer side of the composite cable core through-seal short joint 10 is provided with six through-seal plug mounting holes for six cable cores 13 to apply rubber sleeves, copper plugs, through-seal plugs, and connect the downhole instrument through the core. The periphery of the through-seal plug mounting hole is designed with external threads for installing the bridle housing 11 to protect the overall structure inside. The bridle housing 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-seal short joint 10 is connected with the downhole instrument.

[0049] Embodiment

[0050] The following will be combined Figure 1 The specific embodiments of the present application will be further described.

[0051] The photoelectric composite logging bridle of the present application is used:

[0052] Firstly, the logging photoelectric composite cable is passed through the torpedo shell 1, leaving enough cable core, the two layers of steel wire armor of the photoelectric composite cable are riveted together by riveting assembly 2, and then the riveted assembly is placed in the torpedo shell 1, the tensile strength of which is basically the same as that of the photoelectric composite cable, forming the transition of the photoelectric composite cable to the horse collar.

[0053] The 6 cable cores 13 and the optical fiber steel tube 12 of the photoelectric composite cable are separated, the optical fiber steel tube 12 is passed through the center through hole of the composite cable core distribution short circuit 3, and the 6 cable cores 13 are led out from the two slot openings of the composite cable core distribution short circuit 3 in two groups. The composite cable core distribution short circuit 3 and the torpedo shell 1 are screwed and connected, the torpedo shell 1 is rotated, and the photoelectric composite cable and the composite cable core distribution short circuit 3 are kept stationary to prevent the cable core from winding. After the screw is tightened, the anti-rotation jack screw of the riveting assembly 2 and the composite cable core distribution short circuit 3 is installed.

[0054] The outer wall of the optical fiber steel tube 12 is sealed by the sealing surface of the composite cable core distribution short circuit 3, and the optical fiber steel tube sealing assembly 4 is passed through the optical fiber steel tube 12 and placed in the sealing surface of the composite cable core distribution short circuit 3. The end face of the steel tube is cut off by a pipe cutter, exposing the internal bare optical fiber 14. The bare optical fiber core sealing chamber 5 is passed through the bare fiber, the composite cable core distribution short circuit 3 is screwed, the optical fiber steel tube sealing assembly 4 is compressed, and the sealing is formed.

[0055] The bare optical fiber core sealing chamber 5 has an open chamber inside, the prepared resin sealant is injected into the bare optical fiber core sealing chamber 5, the curing time is 30 minutes, and the structural strength is reached after 12 hours, and 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 tension rod upper connector 6 is threadedly connected to the composite cable core distribution short circuit 3 and sealed by a sealing ring, an anti-rotation jack screw is installed, the bare optical fiber 14 is passed through the through capillary hole of the hollow weak point tension rod 7, and the hollow weak point tension rod 7 with a sealing ring is threadedly connected to the tension rod upper connector 6. The bare optical fiber 14 is passed through the tension rod lower connector 9, threadedly connected to the hollow weak point tension rod 7, and the anti-rotation lock sleeve 8 is installed for fixing.

[0057] The prepared sealant is poured into the middle chamber of the tension rod lower connector 9, the bare optical fiber 14 is passed through the composite cable core through-seal short circuit 10, the composite cable core through-seal short circuit 10 is threadedly connected to the tension rod lower connector 9 and sealed, and an anti-rotation jack screw is installed. After the sealant is cured, the bare optical fiber 14 can be connected to the downhole optical fiber sensor. The 6 cable cores 13 are connected to the downhole instrument by using a rubber sleeve, a copper plug, and a through-seal plug to complete the leading-out of the cable cores.

[0058] Install the bit collar shell, pass the bit collar shell 11 through the integral mounting structure, thread the composite cable core through the core seal short 10, protect the integral structure inside, fill the seal silicone to form an insulating seal on the 6 cable cores 13, and complete the production of the optical-electric composite bit collar.

[0059] In normal logging operations, the optical fiber in the optical-electric composite bit collar is sealed and protected inside the structure. In the event of an engineering accident, the stuck pipe is treated to require the breaking force of the air core weak point tension rod 7, and the weak point tension rod is broken at the same time, the bare optical fiber 14 is broken and the optical cable is recovered. At this time, the end face of the optical fiber steel tube 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 tube 12 and the downhole instrument.

[0060] In the above embodiments, the device elements involved are conventional device elements unless otherwise specified, and the structure setting mode, working mode or control mode involved is conventional setting mode, working mode or control mode in the art unless otherwise specified.

[0061] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present application and not to limit it, and other modifications or equivalent replacements of the technical solutions of the present application made by those skilled in the art should be covered within the scope of the claims of the present application as long as they do not deviate from the spirit and scope of the technical solutions of the present application.

Claims

1. A photoelectric composite logging bridle, characterized in that, include: Composite cable core distribution short circuit (3), one end of which is connected to torpedo casing (1); A bare optical fiber core sealed chamber (5) is provided, with one end of the bare optical fiber core sealed chamber (5) connected to the composite cable core distribution short circuit (3) and the other end connected to a hollow core weak point tension rod (7). The composite cable core through-core sealing short circuit (10) is connected at the end of the composite cable core through-core sealing short circuit (10) to the hollow core weak point tension bar (7); Among them, a riveting assembly (2) is provided between the composite cable core distribution short connector (3) and the torpedo shell (1); the composite cable core distribution short connector (3) has a through hole, and an optical fiber steel tube (12) is provided in the through hole of the composite cable core distribution short connector (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). A bare optical fiber (14) is provided in the optical fiber steel tube (12); an optical fiber steel tube sealing assembly (4) is provided at the end of the through hole of the composite cable core distribution short connector (3) near the bare optical fiber core sealing chamber (5). The optical fiber steel tube sealing assembly (4) is sleeved on the outside of the optical fiber steel tube (12); the hollow core weak point tension bar (7) has a reduced diameter in the middle; both the hollow core weak point tension bar (7) and the composite cable core through-core sealing short connector (10) are provided with through capillary holes for passing through 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 fitted with a tension rod upper connector (6), and the other end of the tension rod upper connector (6) is fitted outside the end of the hollow core weak point tension rod (7). The bare optical fiber core sealing chamber (5) is located in the middle of the tension rod upper connector (6). The other end of the hollow core weak point tension rod (7) away from the tension rod upper connector (6) is fitted with a tension rod lower connector (9), and the other end of the tension rod lower connector (9) is fitted outside the end of the composite cable core through-core sealing short circuit (10).

3. The photoelectric composite logging bridle according to claim 2, characterized in that, The upper connector (6) and the lower connector (9) of the tension bar are connected by an anti-rotation locking sleeve (8).

4. The photoelectric composite logging bridle according to claim 2, characterized in that, The outer side of the torpedo casing (1) is fitted with a horse-head casing (11). A gap is provided between the horse-head casing (11) and the outer wall of the composite cable core distribution short circuit (3), the outer wall of the upper connector of the tension rod (6), and the outer wall of the lower connector of the tension rod (9). 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 slot 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 cable cores (13) is six, and the number of slots of the composite core distribution short circuit (3) is two, with three cable cores (13) passing through each slot.

8. The photoelectric composite logging bridle according to claim 7, characterized in that, The outer side of the composite cable core through-core sealing short circuit (10) has 6 through-core sealing plug mounting holes.

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

10. A method of using a photoelectric composite logging bridle according to any one of claims 1 to 9, characterized in that, Includes the following steps: S1: Pass the logging optical-electric composite cable through the torpedo casing (1); S2: Use the riveting assembly (2) to rivet the two steel wire armor layers of the optoelectronic composite cable together, and then put the riveted assembly into the torpedo shell (1); S3: Separate the cable core (13) and optical fiber tube (12) of the optical fiber composite cable, pass the optical fiber 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: Seal the connection between the outer wall of the optical fiber steel tube (12) and the composite cable core distribution short circuit (3) by means of the optical fiber steel tube sealing assembly (4); S5: Cut the fiber optic steel tube (12) along the end face of the composite cable core distribution short circuit (3) to expose the bare fiber (14) inside, and pass the bare fiber (14) through the bare fiber core sealed chamber (5). S6: Pass the bare optical fiber (14) through the through capillary hole of the hollow weak point tension bar (7), pass the bare optical fiber (14) through the composite cable core through-core sealing short circuit (10), and lead out the cable core (13) from the outside of the composite cable core through-core sealing short circuit (10).

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