CN111123456B - Wellhead crossing method for optical cable with externally coated casing and ground sealing system thereof - Google Patents
Wellhead crossing method for optical cable with externally coated casing and ground sealing system thereof Download PDFInfo
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- CN111123456B CN111123456B CN202010015616.1A CN202010015616A CN111123456B CN 111123456 B CN111123456 B CN 111123456B CN 202010015616 A CN202010015616 A CN 202010015616A CN 111123456 B CN111123456 B CN 111123456B
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- optical cable
- casing
- cable
- crossing
- wellhead
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/46—Processes or apparatus adapted for installing or repairing optical fibres or optical cables
- G02B6/50—Underground or underwater installation; Installation through tubing, conduits or ducts
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/003—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings with electrically conducting or insulating means
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4439—Auxiliary devices
- G02B6/4459—Ducts; Conduits; Hollow tubes for air blown fibres
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/46—Processes or apparatus adapted for installing or repairing optical fibres or optical cables
- G02B6/50—Underground or underwater installation; Installation through tubing, conduits or ducts
- G02B6/508—Fixation devices in ducts for drawing cables
Abstract
The invention provides a wellhead crossing method for an optical cable with a casing externally coated and a ground sealing system thereof. The wellhead crossing method of the optical cable with the casing externally coated comprises the following steps: the optical cable externally coated on the casing enters a well along with the casing, and a split slip is seated; removing a valve outer side flange on one side of the casing head, and reserving an inner side flange; lowering the traction steel wire to the inner flange along the casing, and leading the traction steel wire out of the inner flange; the traction steel wire is pulled upwards to lift the crossing optical cable to the drilling platform, and the crossing optical cable is spliced with the sleeve external application optical cable through the optical cable splicing device; fixing the optical cable splicing device with the casing, removing the split slips, putting the casing into the well, and simultaneously pulling the optical cable outwards at the inner flange; lowering the casing to a preset position, and seating the split slips again; installing a valve of an inner flange, installing a ground sealing system, and splicing a penetrating optical cable and a ground optical cable. The invention solves the problems that the well head of the optical cable is difficult to pass through by externally applying the sleeve in the prior art and the outlet is not provided with a matched sealing protection device.
Description
Technical Field
The invention relates to the technical field of underground optical fiber monitoring of oil and gas fields, in particular to a wellhead crossing method of a casing pipe externally coated optical cable and a ground sealing system thereof.
Background
The horizontal well casing external application optical cable can realize the real-time monitoring of the fracturing modification scale of each section (cluster) of the horizontal well and the pressed production profile, and has important guiding significance for optimizing the fracturing scheme design, dynamically analyzing the pressed energy production contribution rate and the like. How to realize the penetration of the optical cable externally coated on the casing at the wellhead and the sealing of the ground outlet to ensure the transmission quality of optical signals is one of the key technologies of the underground monitoring technology of the optical fiber externally coated on the casing of the horizontal well. Meanwhile, a matched optical cable outlet sealing protection device is lacked.
Therefore, the problems that the wellhead of the optical cable is difficult to pass through by externally applying the casing pipe and a matched sealing protection device is not arranged at an outlet exist in the prior art.
Disclosure of Invention
The invention mainly aims to provide a wellhead crossing method for a casing externally-coated optical cable and a ground sealing system thereof, so as to solve the problems that in the prior art, the wellhead crossing of the casing externally-coated optical cable is difficult and an outlet does not have a matched sealing protection device.
In order to achieve the above object, according to one aspect of the present invention, there is provided a wellhead crossing method for casing external application of a fiber optic cable, comprising: the casing external application optical cable enters a well along with the casing, when the last casing is put down, the seating split slip operation is executed, and the casing external application optical cable is cut off; removing an outer flange of the valve on one side of the casing head, and reserving an inner flange; lowering the traction steel wire to the inner flange along the casing, leading one end of the traction steel wire out of the inner flange, and connecting the traction steel wire with the crossing optical cable; the traction steel wire is pulled upwards to lift the crossing optical cable to the drilling platform, and the crossing optical cable is spliced with the sleeve external application optical cable through the optical cable splicing device; fixing the optical cable splicing device with the casing, removing the split slips, continuously descending the casing into the well, and simultaneously carrying out external pulling operation on the optical cable passing through the inner side flange; lowering the casing to a predetermined position, and performing the seating and valving slip operation again; and (4) cutting the penetrating optical cable, installing a valve of the flange at the inner side, installing a ground sealing system, and splicing the penetrating optical cable and the ground optical cable.
Further, the traction wire is of a soft structure.
Further, before the crossing optical cable and the casing external application optical cable are spliced through the optical cable splicing device, the wellhead crossing method of the casing external application optical cable further comprises the following steps: and stripping the outer protective layer of the crossing optical cable to expose the inner optical fiber of the crossing optical cable, and connecting the inner optical fiber of the crossing optical cable to the first end of the optical cable splicing device.
Further, before the crossing optical cable and the casing external application optical cable are spliced through the optical cable splicing device, the wellhead crossing method of the casing external application optical cable further comprises the following steps: and stripping the outer protective layer of the sleeve external application optical cable to expose the internal optical fiber of the sleeve external application optical cable, and connecting the internal optical fiber of the sleeve external application optical cable to the second end of the optical cable splicing device for splicing.
Further, after the traversing optical cable is spliced with the casing externally-coated optical cable through the optical cable splicing device and before the split slips are released, the method for traversing the wellhead by the casing externally-coated optical cable further comprises the following steps: and detecting the failure condition of the spliced optical fiber signals to ensure the splicing quality of the optical cable.
Further, when the failure condition of the optical fiber signal after splicing is detected, an optical time domain reflectometer is adopted for detection.
According to another aspect of the present invention there is provided a casing-over-casing, cable wellhead-traversing, ground sealing system operable with the above-described method of casing-over-casing, cable wellhead-traversing, the ground sealing system for casing-over-casing, cable wellhead-traversing comprising: one end of the sealing clamping sleeve is connected with a valve of a flange on the inner side of the sleeve head; the optical cable splicing sealing device is used for splicing and sealing the penetrating optical cable and the ground optical cable through the optical cable splicing sealing device; and two ends of the optical cable cutting ball valve are respectively connected with the sealing cutting sleeve and the optical cable splicing sealing device.
Further, the optical cable cutting ball valve is provided with an indicating part and a switch part, wherein the indicating part is used for pressure monitoring and indicating, and the switch part is used for realizing optical cable cutting.
Further, a ground sealing system which is externally coated by the casing and penetrated by the optical cable wellhead adopts double-stage sealing.
Furthermore, the ground sealing system for the casing pipe external application optical cable well head to pass through also comprises an optical time domain reflectometer, and the optical time domain reflectometer is used for detecting the failure condition of the spliced optical fiber signal so as to ensure the splicing quality of the optical cable.
By applying the technical scheme of the invention, the traversing optical cable is pulled to the drilling platform from the ground wellhead by the traction steel wire, so that the traversing optical cable is continuously connected with the casing external application optical cable, the casing is put into the well and the traversing optical cable is pulled outwards at the flange at the inner side of the casing head at the ground wellhead, so that the casing external application optical cable is connected to the outside of the wellhead through the traversing optical cable, and the traversing optical cable is continuously connected with the ground optical cable, thereby realizing the traversing of the casing external application optical cable at the ground wellhead, and the whole traversing process is simple and convenient to operate, safe and reliable. The ground wellhead is provided with a ground sealing system, the penetrating optical cable penetrates through the ground sealing system to be continuously connected with the ground optical cable, the ground sealing system adopts double-stage sealing, the cutting protection under the working condition of abnormal annular pressure conduction can be realized, and the well control safety of the ground wellhead is ensured.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a flow chart illustrating a method of wellhead traversing of a cable casing over-casing in accordance with the present invention;
figure 2 shows a schematic representation of the present embodiment when the last casing is lowered;
FIG. 3 shows a schematic view of the present embodiment with the outer flange removed and the inner flange reserved;
FIG. 4 is a schematic diagram showing the splicing of the tube-over-fiber cable to the crossing cable in this embodiment;
fig. 5 shows a schematic view of the installation of the ground sealing system in this embodiment.
Wherein the figures include the following reference numerals:
10. a sleeve; 20. a split slip; 30. a drilling platform; 40. an inner flange; 50. an outer flange; 60. the optical cable is externally coated on the sleeve; 70. a drum; 80. a traction wire; 90. traversing the optical cable; 100. an optical cable splicing device; 110. sealing the cutting sleeve; 120. an optical cable cutting ball valve; 130. the optical cable is connected with the sealing device; 140. a ground cable.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
It is noted that, unless otherwise indicated, 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.
In the present invention, unless specified to the contrary, use of the terms of orientation such as "upper, lower, top, bottom" or the like, generally refer to the orientation as shown in the drawings, or to the component itself in a vertical, perpendicular, or gravitational orientation; likewise, for ease of understanding and description, "inner and outer" refer to the inner and outer relative to the profile of the components themselves, but the above directional words are not intended to limit the invention.
In order to solve the problems that the wellhead penetration of the optical cable with the externally coated casing is difficult and the outlet does not have a matched sealing protection device in the prior art, the invention provides a wellhead penetration method of the optical cable with the externally coated casing and a ground sealing system thereof.
And operating the ground sealing system penetrated by the wellhead of the optical cable externally coated on the casing by using the method for penetrating through the wellhead of the optical cable externally coated on the casing.
As shown in FIG. 1, the wellhead crossing method for the optical cable coated outside the casing comprises the following steps: the casing external application optical cable 60 enters a well along with the casing 10, when the last casing 10 is lowered, the operation of the seating split slips 20 is executed, and the casing external application optical cable 60 is cut off; removing an outer flange 50 of the valve at one side of the casing head, and reserving an inner flange 40; lowering a traction steel wire 80 to the inner flange 40 along the casing 10, leading one end of the traction steel wire 80 out of the inner flange 40, and connecting the traction steel wire 80 with a through optical cable 90; the pull-up steel wire 80 lifts the crossing optical cable 90 to the drilling platform 30, and the crossing optical cable 90 is spliced with the sleeve external application optical cable 60 through the optical cable splicing device 100; fixing the optical cable splicing device 100 with the casing 10, releasing the split slips 20, continuously descending the casing 10 into the well, and simultaneously carrying out outward pulling operation on the optical cable 90 passing through the inner flange 40; lowering the casing 10 to a predetermined position, and performing the seating-valving slip 20 operation again; the crossing cable 90 is cut off, the valve of the inner flange 40 is installed, the ground sealing system is installed, and the crossing cable 90 is spliced with the ground cable 140.
In this embodiment, A, B posts are required to be respectively arranged at the drilling platform 30 and the ground well in the process of crossing the well of the optical cable 60 externally coated by the casing, and 2 to 3 engineers are equipped at each post to keep smooth communication and cooperate with tacit.
As shown in figure 2, firstly, the optical cable 60 externally coated on the casing normally enters a well along with the casing 10, when the last casing 10 is put down, the operation of the seating split slips 20 is executed, the used split slips 20 adopt the design of a non-complete closed structure, a space passing position is created for the optical cable 60 externally coated on the casing, and the optical cable 60 externally coated on the casing is prevented from being deformed and broken due to extrusion. All the operating steps are completed during the lowering of the last casing 10, without affecting the normal lowering of the previous casing 10.
As shown in fig. 3, post a personnel at the rig 30 pull out about 5 meters of the jacket-coated cable 60 from the drum 70 and cut it off, and the remaining jacket-coated cable 60 is brought to a safe location for fixing. And B post personnel at the ground wellhead cooperate with a drilling team to remove the outer flange 50 and reserve the inner flange 40.
The personnel on post A at the drilling platform 30 lower the traction steel wire 80 from the drilling platform 30 along the casing 10 to about 0.5 m below the inner flange 40, and the personnel on post B at the ground wellhead pull the traction steel wire 80 out of the inner flange 40 and bind and fix the traction steel wire 80 and the through optical cable 90.
As shown in FIG. 4, the person on Duty A at the rig 30 pulls the pulling wire 80 to lift the pass-through fiber optic cable 90 to the rig 30, and the over-jacketed fiber optic cable 60 is spliced to the pass-through fiber optic cable 90 by the cable splicing device 100. The split slips 20 are released, the sleeve 10 is slowly lowered to a certain distance, the optical cable splicing device 100 and the sleeve 10 are bound and fixed, and the optical cable splicing device 100 and the sleeve 10 are bound, so that the sleeve externally-applied optical cable 60 can be firmly fixed on the sleeve 10 and cannot be influenced by the pulling of the spliced optical cable 90, and the sleeve externally-applied optical cable 60 is ensured to be intact. And continuing to slowly lower the casing 10, and synchronously pulling the crossing optical cable 90 outwards by B post personnel at the ground wellhead at the inner flange 40.
After the casing 10 is lowered to the predetermined position, the split-seating slips 20 are again operated to cut the crossing cable 90 at about 3 m from the crossing cable 90 extending out of the inner flange 40, and then the gate of the inner flange is installed, as shown in fig. 5. And finally, installing a ground sealing system, and splicing the traversing optical cable 90 and the ground optical cable 140 through the optical cable splicing sealing device 130 in the ground sealing system to finish the operation of traversing the whole casing pipe externally coated optical cable 60 at the well head.
Specifically, the pull wire 80 is of a soft structure, has good flexibility and trafficability characteristic, and is convenient to pass through a narrow gap between the casing 10 and the well wall from the inner flange 40 to reach the drilling platform 30.
It should be noted that, steel wire protection is provided on both sides of the internal optical fiber of the sleeve external application optical cable 60, and the external portion is filled with hard plastic, which can effectively protect the internal optical fiber. Therefore, before the optical cable 90 for crossing is spliced with the optical cable 60 externally coated on the casing through the optical cable splicing device 100, the method for wellhead crossing of the optical cable externally coated on the casing further comprises the following steps: the outer protective layer of the cross-over cable 90 is stripped to expose the inner optical fiber of the cross-over cable 90, and the inner optical fiber of the cross-over cable 90 is spliced into the first end of the cable splicing device 100.
Similarly, before the optical cable 90 is spliced with the optical cable 60 externally coated on casing by the optical cable splicing device 100, the method for wellhead crossing of the optical cable externally coated on casing further comprises the following steps: the outer protective layer of the sleeve externally-applied optical cable 60 is stripped, the internal optical fiber of the sleeve externally-applied optical cable 60 is exposed, and the internal optical fiber of the sleeve externally-applied optical cable 60 is accessed to the second end of the optical cable splicing device 100 for splicing.
In this embodiment, after splicing the crossing cable 90 to the overboard cable 60 with the cable splicing device 100 and before releasing the split slips 20, the method of overboard cable wellhead crossing further comprises: and detecting the failure condition of the spliced optical fiber signals to ensure the splicing quality of the optical cable.
Specifically, when the failure condition of the optical fiber signal after splicing is detected, an optical time domain reflectometer is adopted for detection. The optical time domain reflectometer measures the transmission loss and the structural loss of the optical fiber by analyzing the backward scattering light or the forward scattering light in the optical fiber, so that the splicing condition of the optical cable can be diagnosed.
The ground sealing system for wellhead crossing of the casing external application optical cable comprises a sealing cutting sleeve 110, an optical cable splicing sealing device 130 and an optical cable cutting ball valve 120. One end of the sealing ferrule 110 is connected to the valve of the inner flange 40. The pass-through cable 90 is spliced and sealed with the surface cable 140 by the cable splice sealing device 130. The two ends of the cable cut ball valve 120 are respectively connected with the sealing ferrule 110 and the cable splicing sealing device 130.
Specifically, the optical cable cut-off ball valve 120 has an indicating portion for pressure monitoring indication and an opening and closing portion for realizing optical cable cut-off. When the well is in the abnormal annular pressure conduction working condition, the switch part can be cut off in time, and the well control safety of the ground wellhead is ensured.
Specifically, a ground sealing system for wellhead penetration of the casing pipe external application optical cable adopts double-stage sealing. The dual-stage seal includes a first stage seal that seals the ferrule 110 and a second stage seal of the cable splice sealing device 130. The double-stage sealing can ensure the sealing performance of the wellhead, thereby preventing annular pressure conduction caused by well cementation quality or fracturing construction and ensuring the safety of the wellhead.
In this embodiment, the ground sealing system that the casing pipe external application optical cable well head passes through further includes an optical time domain reflectometer, and the optical time domain reflectometer is used for detecting the failure condition of the optical fiber signal after splicing, and ensures the splicing quality of the optical cable. The optical time domain reflectometer measures the transmission loss and the structural loss of the optical fiber by analyzing the backward scattering light or the forward scattering light in the optical fiber, so that the splicing condition of the optical cable can be diagnosed.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:
1. the optical cable passes through the ground wellhead by external application of the sleeve, and the whole passing process is simple and convenient to operate, safe and reliable.
2. The ground wellhead is provided with a ground sealing system, the penetrating optical cable penetrates through the ground sealing system to be continuously connected with the ground optical cable, and the ground sealing system adopts double-stage sealing, so that the sealing safety of the ground wellhead is ensured.
3. The existing wellhead device does not need to be changed or other wellhead devices do not need to be added, and the later-stage well cementing and completion operation of the measure well is not influenced.
It is to be understood that the above-described embodiments are only a few, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, devices, components, and/or combinations thereof.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The wellhead crossing method for the optical cable externally coated on the casing is characterized by comprising the following steps of:
the casing external application optical cable (60) enters a well along with the casing (10), when the last casing (10) is lowered, the operation of a sitting split slip (20) is executed, and the casing external application optical cable (60) is cut off;
removing an outer flange (50) of a valve on one side of the casing head, and reserving an inner flange (40);
lowering a traction steel wire (80) to the inner side flange (40) along the sleeve (10), leading one end of the traction steel wire (80) out of the inner side flange (40), and connecting the traction steel wire (80) with a crossing optical cable (90);
pulling up the traction steel wire (80) to lift the optical cable crossing (90) to a drilling platform (30), and splicing the optical cable crossing (90) with the optical cable coated outside the casing (60) through an optical cable splicing device (100);
-fixing the cable splicing device (100) to the casing (10), releasing the split slips (20), continuing to run the casing (10) downhole while pulling out the crossing cable (90) at the inner flange (40);
lowering the casing (10) to a predetermined position, and performing the seating and valving slip (20) operation again;
and (3) cutting the optical cable crossing (90), installing a valve of the inner side flange (40), and installing a ground sealing system, wherein the optical cable crossing (90) is spliced with the ground optical cable (140).
2. A method for wellhead crossing of a cable externally coated on a casing as claimed in claim 1, wherein the traction wire (80) is of a soft structure.
3. The method of overboard cable wellhead crossing of claim 1, wherein before said traversing cable (90) is spliced to said overboard cable (60) by a cable splicing device (100), the method of overboard cable wellhead crossing further comprises:
and stripping the outer protective layer of the crossing optical cable (90), exposing the inner optical fiber of the crossing optical cable (90), and connecting the inner optical fiber of the crossing optical cable (90) to the first end of the optical cable connection device (100).
4. The method of overboard cable wellhead crossing of claim 1, wherein before said traversing cable (90) is spliced to said overboard cable (60) by a cable splicing device (100), the method of overboard cable wellhead crossing further comprises:
and (3) stripping an external protective layer of the sleeve externally-coated optical cable (60), exposing the internal optical fiber of the sleeve externally-coated optical cable (60), and connecting the internal optical fiber of the sleeve externally-coated optical cable (60) to the second end of the optical cable splicing device (100) for splicing.
5. The method of overboard cable wellhead crossing of claim 1, wherein after splicing of the crossing cable (90) with the overboard cable (60) by a cable splicing device (100) and prior to releasing the split slips (20), the method of overboard cable wellhead crossing further comprises: and detecting the failure condition of the spliced optical fiber signals to ensure the splicing quality of the optical cable.
6. A method for wellhead crossing of an optical cable externally coated on a casing as claimed in claim 5, wherein an optical time domain reflectometer is used for detection when failure of the optical fiber signal after splicing is detected.
7. A casing over-casing fiber optic wellhead-traversing ground sealing system, operated using the method of casing over-casing fiber optic wellhead-traversing according to any of claims 1 to 6, the casing over-casing fiber optic wellhead-traversing ground sealing system comprising:
a sealing cutting sleeve (110), wherein one end of the sealing cutting sleeve (110) is connected with the valve of the inner side flange (40);
the optical cable splicing sealing device (130) is used for splicing and sealing the traversing optical cable (90) and the ground optical cable (140) through the optical cable splicing sealing device (130);
and the two ends of the optical cable cut-off ball valve (120) are respectively connected with the sealing ferrule (110) and the optical cable splicing sealing device (130).
8. The ground sealing system for wellhead crossing of the optical cable externally coated on the casing as claimed in claim 7, characterized in that the optical cable cut ball valve (120) is provided with an indicating part and a switch part, the indicating part is used for pressure monitoring indication, and the switch part is used for realizing optical cable cut.
9. The ground sealing system for wellhead crossing of casing over-coating optical cable according to claim 7, wherein the ground sealing system for wellhead crossing of casing over-coating optical cable adopts double-stage sealing.
10. The ground sealing system for wellhead crossing of the optical cable externally coated on the casing as claimed in claim 7, wherein the ground sealing system for wellhead crossing of the optical cable externally coated on the casing further comprises an optical time domain reflectometer, and the optical time domain reflectometer is used for detecting the failure condition of the optical fiber signal after splicing so as to ensure the splicing quality of the optical cable.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010015616.1A CN111123456B (en) | 2020-01-07 | 2020-01-07 | Wellhead crossing method for optical cable with externally coated casing and ground sealing system thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010015616.1A CN111123456B (en) | 2020-01-07 | 2020-01-07 | Wellhead crossing method for optical cable with externally coated casing and ground sealing system thereof |
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| CN111123456A CN111123456A (en) | 2020-05-08 |
| CN111123456B true CN111123456B (en) | 2021-09-28 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108802927A (en) * | 2018-05-29 | 2018-11-13 | 国家电网公司 | Optical cable skirt system |
| CN110174738A (en) * | 2019-06-28 | 2019-08-27 | 中国水利水电科学研究院 | A kind of tube-in-tube structure and laying method convenient for fiber cable laying replacement |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3430456A1 (en) * | 2016-03-17 | 2019-01-23 | Ormond Energy Innovations Inc. | Protective fiber optic termination, system, and method of using same |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108802927A (en) * | 2018-05-29 | 2018-11-13 | 国家电网公司 | Optical cable skirt system |
| CN110174738A (en) * | 2019-06-28 | 2019-08-27 | 中国水利水电科学研究院 | A kind of tube-in-tube structure and laying method convenient for fiber cable laying replacement |
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