RU2792131C2 - Sealed fiber optic channel cable for logging and method of its manufacture - Google Patents

Abstract

FIELD: oil production technologies; manufacturing a sealed fibre optic channel cable for logging.

SUBSTANCE: manufacturing method includes four steps: forming an optical fibre protective tube in which the optical fibre is situated; forming a filling layer formed with an aluminium tube, forming a reinforcing tube, and forming a sealing layer.

EFFECT: invention makes it possible to manufacture a long fibre optic channel cable with high strength, good thermal stability, low signal transmission losses, high transmission speed and synchronous transmission of multiple signals.

1 cl, 8 dwg

Description

The field of technology to which the invention belongs

The present invention relates to the technical field of oil production technologies, in particular to a pressurized logging fiber-optic channel cable and to a method for its manufacture.

State of the art

The logging cable can be used not only for logging, perforation, coring, etc. operations. in various oil and gas wells, but also for hydraulic and hydrological surveys, coal exploration, geothermal logging, etc. . However, existing logging cable usually transmits electrical signals over metal conductors. The transmission speed is low and the amount of information is small; so that the existing logging cable cannot be used in difficult working conditions.

Disclosure of the essence of the invention

The object of the present invention is to provide a logging sealed fiber optic channel cable for solving the following problem: the logging cable usually transmits electrical signals over metal conductors; the transmission speed is low, and the amount of information is small; so that the logging cable cannot be used in difficult working conditions.

To solve the above technical problem, the present invention proposes the following technical solution:

The logging sealed fiber optic channel cable according to the present invention comprises an outer sealing layer. At least one reinforcing tube is located in the sealing layer. In each reinforcing tube there is a protective tube of the optical fiber. A filling layer is located in the space between the protective tube of the optical fiber and the reinforcing tube. An optical fiber is located in the protective tube of the optical fiber.

In addition, the sealing layer is made of thermoplastic materials such as thermoplastic vulcanizate (TPV), polypropylene (PP), fluorinated ethylene propylene (FEP) or polyvinylidene fluoride (PVDF).

In addition, the reinforcement tube is made of 316L, 825, or 2205 stainless steel welded tubing.

In addition, the optical fiber protection tube is made of 316L or 825 stainless steel welded tube.

In addition, the optical fiber has a high temperature coating. At least one core is located in the high-temperature coating. Each core is covered with a quartz sheath.

In addition, the sealing layer is additionally provided with reinforcing elements or an oil tube.

In addition, the filling layer is formed by an aluminum tube or a mica strip.

A method for manufacturing a logging sealed fiber-optic channel cable includes the following steps:

step 1: laying down the optical fiber and forming the protective tube: respectively positioning the steel coil raw material for manufacturing the optical fiber protective tube and the wound optical fiber on the respective winding devices; directing the initial end of the steel coil raw material for manufacturing an optical fiber protective tube so that it passes through a steel tube initial forming device, an optical fiber winding device, a laser welding device, a non-destructive testing device, a steel tube drawing device, and a pulling device for manufacturing a protective tube in succession optical fiber; winding the optical fiber protective tube with the optical fiber protective tube winder;

stage 2: formation of the filling layer:

if the fill layer is formed from an aluminum tube, respectively positioning the aluminum coil raw material to form the fill layer and the wound optical fiber protective tube on respective winders; guiding the leading end of the aluminum coil raw material for making the fill layer so that it passes through the aluminum tube initial forming device, the optical fiber protective tube winding device, the laser welding device, the tube diameter adjusting device, and the aluminum tube traction device in succession; winding the aluminum tube through the winding device;

step 3: forming the reinforcement tube: placing the steel coil raw material for making the reinforcement tube and the aluminum tube on respective winders; cover the filling layer with a reinforcing tube using the devices used in step 1; winding the filling layer covered with the reinforcing tube using a winding device;

step 4: formation of the sealing layer: position the reinforcement tube to be sealed on the appropriate winding device, guide the initial end of the reinforcement tube so that it passes successively through the straightening device, the preheating device, the sealing and extrusion device, the cooling device and the traction device to form a sealing layer; winding the sealed fiber optic channel cable with the help of a winding device.

In addition, if the fill layer is formed from a mica tape, the mica tape is wrapped around the optical fiber protective tube by a winder.

Compared with the prior art, the present invention has the following positive effects:

The sealing layer according to the present invention improves the corrosion resistance of the reinforcement tube. The armor tube is designed to protect the internal optical fiber from external mechanical force to relieve pressure. The filling layer is mainly for connecting the optical fiber protection tube with the outer armor tube, so as to greatly protect the inner optical fiber and prevent the inner optical fiber from being damaged during the welding of the outer reinforcement tube. The fiber optic channel cable according to the present invention has the following advantages: it has a long length, high strength, good temperature resistance, low signal transmission loss, high transmission speed, and achieves synchronous transmission of multiple signals.

Brief description of the drawings

The present invention is further described below with reference to the accompanying drawings.

In FIG. 1 is a schematic structural diagram of a logging sealed fiber optic channel cable according to Embodiment 1 of the present invention;

in fig. 2 is a flowchart for stacking an optical fiber and forming a protective tube in Embodiment 1 of the present invention;

in fig. 3 is a block diagram of the sequence of actions for the formation of the fill layer in embodiment 1 of the present invention;

in fig. 4 is a block diagram of the sequence of actions for the formation of a reinforcing tube in embodiment 1 of the present invention;

in fig. 5 is a flow chart of the formation of a sealing layer in Embodiment 1 of the present invention;

in fig. 6 is a flow chart of the formation of a mica tape filling layer in Embodiment 3 of the present invention;

in fig. 7 is a schematic structural diagram of Embodiment 3 of the present invention when reinforcing elements are located in the sealing layer;

in fig. 8 is a schematic structural diagram of Embodiment 4 of the present invention when an oil tube is disposed in the sealing layer.

Reference list: 1 sealing layer, 2 armoring tube, 3 optical fiber protection tube, 4 filling layer, 5 optical fiber, 501 high temperature coating, 502 quartz sheath, 503 core, 6 reinforcing element and 7 - oil pipe.

Implementation of the invention

In order for a person skilled in the art to better understand the present invention, it is described in detail below with reference to the accompanying drawings and particular embodiments of the same.

Embodiment 1

As shown in FIG. 1, this embodiment of the invention relates to a logging sealed fiber optic channel cable containing an outer sealing layer 1. At least one reinforcement tube 2 is located in the sealing layer 1. In this embodiment of the invention, there is only one reinforcement tube 2. In the reinforcement tube 2 is a protective tube 3 of the optical fiber. In the space between the protective tube 3 of the optical fiber and the reinforcing tube 2, a filling layer 4 is located. An optical fiber 5 is located in the protective tube 3 of the optical fiber.

The sealing layer 1 is formed from various non-metallic materials to protect the reinforcement tube 2. It is made from oil, corrosion and high temperature resistant materials. The sealing layer 1 may be made of thermoplastic materials such as thermoplastic vulcanizate (TPV), polypropylene (PP), fluorinated ethylene propylene (FEP), polyvinylidene fluoride (PVDF) and the like.

Reinforcing tube 2 is designed to protect the inner optical fiber from external mechanical force to relieve pressure. Reinforcing tube 2 is made of 316L, 825, or 2205 stainless steel welded tube.

The optical fiber protection tube 3 is made of 316L or 825 stainless steel welded tube. The optical fiber protection tube 3 protects the fragile optical fiber and has a shock-absorbing function to a certain extent.

The filling layer 4 is mainly for connecting the optical fiber protection tube 3 with the outer reinforcement tube 2, so as to largely protect the inner optical fiber and prevent the inner optical fiber from being damaged during the welding of the outer reinforcement tube 2. The filling layer 4 is formed by aluminum tube or mica tape. .

In this embodiment, the optical fiber 5 has a high temperature coating 501. At least one strand 503 is located in the high temperature coating 501. Each strand 503 is covered with a quartz sheath 502. High temperature acrylate coating or polyimide coating can be selected for the high temperature coating 501.

As shown in FIG. 2-5, a method for manufacturing a logging sealed fiber optic channel cable includes the following steps:

As shown in FIG. 2, the stacking of the optical fiber and the formation of the protective tube are specifically as follows: the steel coil raw material for manufacturing the optical fiber protective tube 3 and the wound optical fiber 5 are respectively arranged on the respective winders; directing the initial end of the steel coil raw material for manufacturing the optical fiber protective tube 3 so that it passes through the steel tube initial forming device, the optical fiber winding device, the laser welding device, the non-destructive testing device, the steel tube drawing device, and the pulling device for manufacturing the protective tube in succession. 3 fiber optic tubes; winding the optical fiber protective tube 3 with the optical fiber protective tube winder.

The steel strip is formed into a U-shape by a steel tube starter. The optical fiber 5 is placed into the optical fiber protective tube 3 through the U-shaped hole by the action of the winder. During placement, the optical fiber must pass through the guide wheel. The guide wheel presses the optical fiber 5 against the bottom surface of the optical fiber protection tube 3 to prevent damage to the optical fiber 5 due to the high temperature of laser welding. The laser welding device is used to weld the mating groove of the protective tube 3 of the optical fiber. The non-destructive testing device performs non-destructive testing of the welded optical fiber protective tube 3 using eddy currents.

After the initial formation of the optical fiber protective tube 3, its initial end passes through the steel tube drawing device, so that the diameter of the tube changes. At this time, the steel tube drawing device stops, the initial end of the optical fiber 5 is placed in the initially formed optical fiber protective tube 3. Then, the optical fiber 5 is manually moved forward until the initial end of the optical fiber 5 abuts against the constriction of the protective tube 3 of the optical fiber. The constriction point of the optical fiber protective tube 3 clamps the optical fiber 5. At this time, the steel tube drawing device is started. The optical fiber 5 follows the optical fiber protective tube 3 which is pulled forward.

As shown in FIG. 3, the formation of the fill layer is specifically as follows: if the fill layer 4 is formed from an aluminum tube, then respectively arrange the aluminum coil raw material to form the fill layer 4 and the wound optical fiber protective tube 3 on the respective winding devices; directing the initial end of the aluminum coil raw material for making the filling layer 4 to pass through the aluminum tube initial forming device, the optical fiber protective tube winding device, the laser welding device, the tube diameter adjusting device, and the aluminum tube traction device in succession; winding the aluminum tube through the winding device. In this embodiment, the aluminum tube is the filling layer 4.

As shown in FIG. 4, the formation of the reinforcement tube is specifically as follows: positioning the steel coil raw material for manufacturing the reinforcement tube 2 on an appropriate winding device; positioning the optical fiber protective tube 3 coated with the filling layer 4 on the winder; cover the filling layer 4 with a reinforcing tube 2 using the devices used in step 1; winding the filling layer, covered with a reinforcing tube, using a winding device.

As shown in FIG. 5, the formation of the sealing layer is, in particular, the following: positioning the reinforcement tube 2 to be sealed on a suitable winding device, guiding the initial end of the reinforcement tube 2 so that it passes successively through the straightening device, the preheating device, the sealing device. and extrusion, a cooling device and a traction device for forming a sealing layer 1; winding the sealed fiber optic channel cable with the help of a winding device.

It should be noted that winding devices for steel tape, optical fiber and channel cable are used for placing raw material, semi-finished products and finished products on them, as well as for issuing or winding materials. The drawing device draws the steel tube to the required size using pre-set die characteristics. The drawing force is provided by means of a drawing gear mechanism. The traction device provides traction to move the protective tube of the optical fiber.

In this embodiment, a stainless steel tube forming machine manufactured by Guangzhou Yangcheng Machinery Manufacture Co., Ltd. is used in the steel tube starter. The laser welding device is manufactured by United Winners Laser Co., Ltd. in Shenzhen. The above production devices are prior art and those skilled in the art can buy existing production devices on the market. These devices are not described here.

Embodiment 2

As shown in FIG. 6, this embodiment of the invention relates to a method for manufacturing a logging sealed channel fiber optic cable, which includes: step 1, in which an optical fiber is laid and a protective tube is formed; step 2, which form the filling layer; step 3, which form the reinforcing tube; step 4, in which the sealing layer is formed.

In this embodiment of the invention, mica tape is used to form the filling layer 4. The mica tape is wound on the optical fiber protective tube 3 by means of a winder. The winding device is a winding machine. Other manufacturing steps are completely the same as the steps of option 1 of the invention, which are not described here.

Embodiment 3

As shown in FIG. 7, this embodiment of the invention relates to a logging sealed fiber optic channel cable comprising an outer sealing layer 1. At least one armor tube 2 is located in the sealing layer 1. An optical fiber protective tube 3 is located in the armor tube 2. In the space between the optical fiber protective tube 3 and the armouring tube 2, a filling layer 4 is located. An optical fiber 5 is located in the optical fiber protective tube 3. The structure of the optical fiber 5 in this embodiment is the same as that of the optical fiber in the embodiment 1 of the invention, and not described here. In this embodiment of the invention, the sealing layer 1 also contains two reinforcing elements 6 respectively located on both sides of the reinforcing tube 2. Stainless steel stranded cables can be used as reinforcing elements 6.

Embodiment 4

As shown in FIG. 8, this embodiment of the invention relates to a logging sealed fiber optic channel cable comprising an outer sealing layer 1. At least one armor tube 2 is located in the sealing layer 1. An optical fiber protective tube 3 is located in the armor tube 2. In the space between the optical fiber protective tube 3 and the armouring tube 2, a filling layer 4 is located. An optical fiber 5 is located in the optical fiber protective tube 3. The structure of the optical fiber 5 in this embodiment is the same as that of the optical fiber in the embodiment 1 of the invention, and not described here.

In this embodiment, the sealing layer 1 further comprises an oil tube 7. The oil tube 7 conveys ground hydraulic oil/fluid to the shaft and communicates with the hydraulic device.

The above embodiments of the invention are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made to the technical solution according to the present invention by those skilled in the art, without deviating from the gist of the present invention, shall fall within the protection scope of the appended claims of the present invention.

Claims (5)

A method for manufacturing a logging sealed fiber-optic channel cable, including the following steps: step 1: forming the optical fiber protection tube (3) in which the optical fiber (5) is disposed: respectively positioning the steel coil raw material for manufacturing the optical fiber protection tube (3) and the optical fiber (5) on the respective winding devices; directing the initial end of the steel coil raw material for manufacturing the optical fiber protective tube (3) so that it passes through the steel tube initial forming device, the optical fiber winding device, the laser welding device, the non-destructive testing device, the steel tube drawing device, and the pulling device for successively manufacturing a protective tube (3) of the optical fiber, in which the optical fiber (5) is located; winding the protective tube (3) of the optical fiber, in which the optical fiber (5) is located, using the winding device of the protective tube of the optical fiber, in which the optical fiber (5) is located; Step 2: Forming the fill layer (4) formed by the aluminum tube: respectively position the aluminum roll raw material for making the fill layer (4) and the optical fiber protection tube (3) in which the optical fiber (5) is located on the respective winding devices; directing the initial end of the aluminum roll raw material for manufacturing the filling layer (4) formed by the aluminum tube so that it passes through the aluminum tube initial forming device, the winding device of the optical fiber protective tube (3) in which the optical fiber (5) is located , a laser welding device, a device for adjusting the diameter of the tube and a traction device for manufacturing an aluminum tube, in which the protective tube (3) of the optical fiber and the optical fiber (5) are located; winding the aluminum tube, in which the protective tube (3) of the optical fiber and the optical fiber (5) are located, using the winding device; step 3: forming the reinforcing tube (2): placing the steel coil raw material for making the reinforcing tube (2) and the aluminum tube in which the optical fiber protective tube (3) and the optical fiber (5) are located on the respective winding devices; covering the filling layer (4) formed by the aluminum tube, in which the protective tube (3) of the optical fiber and the optical fiber (5) are located, with the reinforcing tube (2) using the devices used in step 1; winding the reinforcing tube (2) in which the filling layer (4), the protective tube (3) of the optical fiber and the optical fiber (5) are located, using a winding device; step 4: formation of the sealing layer (1): the reinforcing tube (2), in which the filling layer (4), the protective tube (3) of the optical fiber and the optical fiber (5) are located, is placed on the corresponding winding device, the initial end of the reinforcing tube is guided (2), in which the filling layer (4), the optical fiber protection tube (3), and the optical fiber (5) are located, so that it passes through the straightening device, the preheating device, the sealing and extrusion device, the cooling device, and the traction a device for forming a logging sealed fiber optic channel cable containing a sealing layer (1), a reinforcing tube (2), a filling layer (4), a protective tube (3) of an optical fiber and an optical fiber (5); winding the specified logging sealed reinforcing fiber-optic channel cable using a winding device.

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