A fiber optic rapid deployment device and method of use within a wellbore

Abstract

The application provides a kind of wellbore optical fiber fast deployment device and use method, belong to seismic exploration acquisition technical field.The device includes optical fiber storage warehouse, the screw rod is fixed in the optical fiber storage warehouse, the screw rod is worn with a optical fiber reel, the optical fiber is covered on the optical fiber reel;The top of the optical fiber storage warehouse is provided with a through hole, and the optical fiber wound on the optical fiber reel passes through the through hole and extends out of the optical fiber storage warehouse.This application can realize fast laying optical fiber in a short time, since the optical fiber storage warehouse and the outer armor protective layer are made of soluble material, and high temperature grease is filled between the outer armor protective layer and the optical fiber, after the optical fiber storage warehouse and the outer armor protective layer are dissolved, the optical fiber is adsorbed on the casing inner wall through the grease, which reduces the attenuation effect of the outer armor protective layer on the optical fiber data acquisition signal, thereby increasing the signal sensing ability, the overall cost is lower, and the coupling ability is stronger.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of seismic exploration acquisition, and particularly relates to a device for rapidly deploying an optical fiber in a wellbore and a use method thereof. BACKGROUND

[0002] Optical fibers in casings are mostly in the form of photoelectric composite cables or continuous tubing-bound optical fibers, which have the advantages of being reusable, being able to be used with conventional geophones or crawlers, etc., and the disadvantages of poor coupling effect, long deployment equipment cycle, high long-period use cost, etc. They are mostly used in VSP, production profile monitoring, and adjacent well fracturing monitoring, etc.

[0003] The existing bare optical fiber is usually lowered into a well by using an optical fiber tape with a weight, and the optical fiber is usually wrapped with an outer armor with a certain tensile coefficient (the outer armor usually has a tensile coefficient that is not as strong as a steel wire armor due to cost constraints). During the process of collecting signals after the optical fiber is lowered into the well, the outer armor will have a certain attenuation effect on the collected signals, affecting the signal sensing ability. At the same time, the speed and tension are not controlled during the existing optical fiber lowering process, which can easily cause the optical fiber to break due to the excessive speed and tension during the lowering process, thereby affecting the lowering speed of the optical fiber. SUMMARY

[0004] The application aims to solve the problems in the prior art, and provides a device for rapidly deploying an optical fiber in a wellbore and a use method thereof, which can rapidly deploy the optical fiber in a short time and further reduce the attenuation effect of the outer armor on the signals to increase the signal sensing ability.

[0005] One of the purposes of the application is to provide a device for rapidly deploying an optical fiber in a wellbore.

[0006] The second purpose of the application is to provide a use method of the device for rapidly deploying an optical fiber in a wellbore.

[0007] The application is achieved by the following technical solutions:

[0008] In a first aspect, the application provides a device for rapidly deploying an optical fiber in a wellbore, which comprises an optical fiber storage bin, a screw rod fixed in the optical fiber storage bin, an optical fiber reel passing through the screw rod, and an optical fiber wound on the optical fiber reel.

[0009] A through hole is arranged on the top of the optical fiber storage bin, and the optical fiber wound on the optical fiber reel passes through the through hole and extends out of the optical fiber storage bin.

[0010] The application is further improved in that:

[0011] The optical fiber comprises an optical fiber body, an outer armor protection layer arranged outside the optical fiber body, and oil high-temperature grease filled between the outer armor protection layer and the optical fiber body.

[0012] The further improvement of the present application is that:

[0013] The fiber reel is provided with a circular hole, and the center axis of the circular hole coincides with the center axis of the fiber reel.

[0014] The further improvement of the present application is that:

[0015] The screw rod is inserted into the circular hole, and the diameter of the circular hole is greater than the outer diameter of the screw rod.

[0016] The further improvement of the present application is that:

[0017] The screw rod is horizontally arranged in the fiber storage bin, and the two ends of the screw rod are welded on the inner side walls of the fiber storage bin, respectively.

[0018] The circular hole provided on the fiber reel is a through hole, and the screw rod directly passes through the circular hole.

[0019] The further improvement of the present application is that:

[0020] The screw rod is vertically arranged in the fiber storage bin, and the bottom end of the screw rod is welded on the bottom in the fiber storage bin.

[0021] The screw rod is inserted into the circular hole.

[0022] The further improvement of the present application is that:

[0023] The wellbore fiber rapid deployment device further comprises a counterweight, and the counterweight is arranged at the lower end of the fiber storage bin.

[0024] The further improvement of the present application is that:

[0025] The fiber storage bin, the outer armor protection layer and the counterweight are all made of soluble materials, which can be lipids such as polyvinyl alcohol or other soluble resin materials, or aluminum magnesium alloy or other metal soluble materials, and no specific requirements are made here.

[0026] In the present application, the fiber storage bin, the outer armor protection layer and the counterweight are all made of soluble materials, and high-temperature grease is filled between the outer armor protection layer and the fiber, so that after the fiber storage bin and the outer armor protection layer are dissolved, the fiber is adsorbed on the inner wall of the casing through the grease, and the overall cost is lower and the coupling capacity is stronger.

[0027] The further improvement of the present application is that:

[0028] The wellbore optical fiber rapid deployment device further comprises a ground fixed cable reel fixed on the ground, one end of the optical fiber is wound on the optical fiber reel of the optical fiber storage bin, and the other end is wound on the ground fixed cable reel through the through hole at the top of the optical fiber storage bin.

[0029] In a second aspect of the present application, a method for using the wellbore optical fiber rapid deployment device is provided, specifically:

[0030] The top through hole of the optical fiber storage bin is pulled out and then wound and fixed on the ground fixed cable reel, and then the wellbore optical fiber rapid deployment device is lowered to the designated position, and is left until the counterweight, the optical fiber storage bin and the outer armor protection layer are dissolved, the high-temperature grease adheres the optical fiber to the inner wall of the casing, and the corresponding data collection work begins.

[0031] Compared with the prior art, the present application has the following beneficial effects:

[0032] The present application realizes rapid deployment of optical fiber in a short time, and further reduces the attenuation effect of the outer armor protection layer on the optical fiber data collection signal, thereby increasing the signal sensing capability.

[0033] In the present application, the optical fiber storage bin, the outer armor protection layer and the counterweight are all made of soluble materials, and high-temperature grease is filled between the outer armor protection layer and the optical fiber, so that after the optical fiber storage bin and the outer armor protection layer are dissolved, the optical fiber is adsorbed on the inner wall of the casing through the grease, and the overall cost is lower and the coupling capability is stronger. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 is a structural schematic view of the first wellbore optical fiber rapid deployment device in the present application;

[0035] Figure 2 is a structural schematic view of the second wellbore optical fiber rapid deployment device in the present application.

[0036] In the drawings,

[0037] 1, optical fiber storage bin;

[0038] 2, screw rod;

[0039] 3, optical fiber reel;

[0040] 4, optical fiber;

[0041] 5, counterweight;

[0042] 6, ground fixed cable reel. DETAILED DESCRIPTION

[0043] The present application will be further described in detail below with reference to the drawings:

[0044]

Example 1

[0045] As Figure 1 and Figure 2 The application provides a kind of wellbore optical fiber fast deployment device, it is overall conical cylinder, including optical fiber storage warehouse 1, screw rod 2 is fixed in the optical fiber storage warehouse 1, optical fiber reel 3 is worn on the screw rod 2, optical fiber 4 is covered on the optical fiber reel 3;

[0046] The top of the optical fiber storage warehouse 1 is provided with a through hole, and the optical fiber 4 wound on the optical fiber reel 3 passes through the through hole and extends out of the optical fiber storage warehouse 1.

[0047] The optical fiber storage warehouse 1 is made of soluble material, which can be a cuboid, a cylinder, a polyhedron or the like with a cavity structure, and its shape is not limited. The soluble material can be a lipid such as polyvinyl alcohol or other soluble resin material, or an aluminum-magnesium alloy or other metal soluble material, which is not specifically required here.

[0048] The optical fiber 4 includes an optical fiber body, an outer armored protective layer is provided outside the optical fiber body, and oil grease is filled between the outer armored protective layer and the optical fiber body. The high-temperature grease is an oil grease with a temperature resistance of 150 DEG C or above, which is usually related to the target well temperature. If the well temperature exceeds 150 DEG C, an oil grease with a temperature resistance of 200 DEG C is selected.

[0049] The outer armored protective layer is made of soluble material, which can be a lipid such as polyvinyl alcohol or other soluble resin material, or an aluminum-magnesium alloy or other metal soluble material, which is not specifically required here.

[0050] Since the optical fiber storage warehouse 1 and the outer armored protective layer are both made of soluble material, when the wellbore optical fiber fast deployment device is placed in a designated position in a vertical well or a horizontal well, it is static for a certain period of time to wait for the dissolution of the optical fiber storage warehouse and the outer armored protective layer. The high-temperature grease adheres the optical fiber to the inner wall of the casing, and the corresponding data collection work begins.

[0051] The application can realize fast deployment of optical fiber in a short time. Since the optical fiber storage warehouse and the outer armored protective layer are both made of soluble material, and high-temperature grease is filled between the outer armored protective layer and the optical fiber, after the optical fiber storage warehouse and the outer armored protective layer are dissolved, the optical fiber is adsorbed on the inner wall of the casing through the grease, which reduces the attenuation effect of the outer armored protective layer on the optical fiber data collection signal, thereby increasing the signal sensing capability, and the overall cost is lower and the coupling capability is stronger.

[0052] Example 2

[0053] The optical fiber reel 3 is provided with a circular hole, and the center axis of the circular hole coincides with the center axis of the optical fiber reel 3.

[0054] The screw rod 2 is inserted into the round hole, and the diameter of the round hole is greater than the outer diameter of the screw rod 2, so that the resistance is reduced during the process of pulling the optical fiber 4 out of the through hole at the top of the optical fiber storage bin 1 or placing the entire device into a designated position in the vertical well or horizontal well, avoiding excessive pulling force that causes the optical fiber to break.

[0055] [Example 3]

[0056] The screw rod 2 is welded to the inner wall of the optical fiber storage bin 1, and the screw rod 2 is vertically or horizontally arranged in the optical fiber storage bin 1.

[0057] As shown in Figure 1 , the screw rod 2 is horizontally arranged in the optical fiber storage bin 1, and the two ends of the screw rod 2 are fixed to the inner side wall of the optical fiber storage bin 1 by welding, at this time the round hole provided on the optical fiber coil 3 is a through hole, and the screw rod 2 directly passes through the round hole.

[0058] As shown in Figure 2 , the screw rod 2 is vertically arranged in the optical fiber storage bin 1, and the bottom end of the screw rod 2 is fixed to the bottom of the optical fiber storage bin 1 by welding, at this time the round hole provided on the optical fiber coil 3 can be a through hole or a hole with a closed top, and the screw rod 2 is inserted into the round hole.

[0059] When the screw rod 2 is vertically arranged in the optical fiber storage bin 1, the optical fiber coil 3 adopts a structure with a thin upper end and a thick lower end, which is more conducive to the release of the optical fiber 4.

[0060] [Example 4]

[0061] The wellbore optical fiber rapid deployment device further comprises a counterweight 5, which is arranged at the lower end of the optical fiber storage bin 1, and the counterweight 5 is a dissolvable bridge plug or is made of a dissolvable material. The dissolvable material can be a lipid such as polyvinyl alcohol or other soluble resin materials, or an aluminum-magnesium alloy or other metal soluble materials, which are not specifically required here.

[0062] Preferably, the lower end of the counterweight 5 is a conical structure, further preferably a circular cone, which reduces resistance and facilitates the smooth placement of the wellbore optical fiber rapid deployment device in a wellbore with high density well fluid.

[0063] [Example 5]

[0064] The wellbore optical fiber rapid deployment device further comprises a ground fixed cable reel 6, which is fixed to the ground, one end of the optical fiber 4 is wound on the optical fiber coil 3 in the optical fiber storage bin 1, and the other end is wound on the ground fixed cable reel 6 through the through hole at the top of the optical fiber storage bin 1.

[0065] When the wellbore optical fiber rapid deployment device is lowered into the well, if the optical fiber cable is too fast during the lowering process, the optical fiber reel cannot release the optical fiber in time, and the outer armor protection layer on the optical fiber bears too much tension, so the ground fixed cable reel needs to release part of the optical fiber to match the lowering speed, so as to avoid cable breakage caused by too much tension.

[0066] [Example 6]

[0067] The application provides a use method of a wellbore optical fiber rapid deployment device, and the structure of the wellbore optical fiber rapid deployment device is as shown in Figure 1 and Figure 2 The wellbore optical fiber rapid deployment device comprises an optical fiber storage bin 1, the optical fiber storage bin 1 is made of soluble material, a screw rod 2 is fixed in the optical fiber storage bin 1, an optical fiber reel 3 is penetrated through the screw rod 2, and an optical fiber 4 is wound on the optical fiber reel 3; a through hole is arranged on the top of the optical fiber storage bin 1, the optical fiber 4 wound on the optical fiber reel 3 is penetrated through the through hole and extends out of the optical fiber storage bin 1 and is wound on a ground fixed cable reel 6; the optical fiber 4 comprises an optical fiber body, an outer armor protection layer is arranged outside the optical fiber body, the outer armor protection layer is made of soluble material, and oil high-temperature grease is filled between the outer armor protection layer and the optical fiber body, the oil high-temperature grease is oil with a temperature resistance of 150 DEG C or above, and is usually related to the target well temperature; if the well temperature exceeds 150 DEG C, oil with a temperature resistance of 200 DEG C is selected.

[0068] The wellbore optical fiber rapid deployment device further comprises a counterweight 5, the counterweight 5 is arranged at the lower end of the optical fiber storage bin 1, and the counterweight 5 is a soluble bridge plug or is made of soluble material,

[0069] Since the optical fiber storage bin 1, the outer armor protection layer and the counterweight 5 are all made of soluble material, after the wellbore optical fiber rapid deployment device is placed in a specified position in a vertical well or a horizontal well and is static for a certain period of time, the optical fiber storage bin and the outer armor protection layer are dissolved, the high-temperature grease adheres the optical fiber to the inner wall of the casing, and corresponding data acquisition work is started.

[0070] The specific use method is as follows:

[0071] (1) For a vertical well, the optical fiber 4 is pulled out of the through hole on the top of the optical fiber storage bin 1 and is reversely wound on the ground fixed cable reel 6, after winding and fixing, the whole wellbore optical fiber rapid deployment device is placed in the casing, is free-falling into the well fluid, and relies on its own gravity to take out the optical fiber in the optical fiber storage bin; when the outer armor protection layer on the optical fiber bears too much tension, part of the optical fiber of the ground fixed cable reel is released, so as to avoid cable breakage caused by too much tension.

[0072] It should be noted that the tension coefficient of the outer armor protection layer on the optical fiber 4 can be determined during the manufacturing process. The tension monitoring system of the cable winch can be used to obtain the tension of the outer armor protection layer by using a tension sensor. When the limit value of 60% is reached, the cable is released. The release speed can be controlled by the motor system. The initial release speed is 0.1 m / s. If the tension continues to increase, the release speed will be increased. If the tension does not increase and does not exceed 70% of the limit value, the existing speed will be maintained until the end.

[0073] (2) For horizontal wells, the top through hole of the optical fiber storage bin 1 is extracted at the wellhead, and then passes through the wellhead blowout preventer. Then, it is wound and fixed on the ground fixed cable reel 6. If necessary, the optical fiber can be wound on the ground fixed cable reel 6. Then, the entire wellbore optical fiber rapid deployment device is pumped to the designated position at a constant speed by injecting liquid.

[0074] (3) For both vertical and horizontal wells, the entire wellbore optical fiber rapid deployment device is placed for 24 hours after reaching the designated position. The counterweight 5, the optical fiber storage bin 1 and the outer armor protection layer are dissolved. The high-temperature grease adheres the optical fiber to the inner wall of the casing. The corresponding data collection work begins.

[0075] (4) After the collection task is completed, the optical fiber is cut directly at the wellhead or the ground end optical fiber is left in the fixed compartment for subsequent monitoring needs. This method is suitable for short-term monitoring needs.

[0076] The present application realizes rapid deployment of optical fiber in a short time, and further reduces the attenuation effect of the outer armor protection layer on the optical fiber data collection signal, thereby increasing the signal sensing capability.

[0077] In the present application, the optical fiber storage bin 1, the outer armor protection layer and the counterweight 5 are all made of soluble materials. The high-temperature grease is filled between the outer armor protection layer and the optical fiber. After the optical fiber storage bin and the outer armor protection layer are dissolved, the optical fiber is adsorbed on the inner wall of the casing through the grease. The overall cost is lower and the coupling ability is stronger.

[0078] In the description of the present application, it should be noted that unless otherwise specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected. It can be mechanically connected, or electrically connected. It can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0079] In the description of the present application, unless otherwise specified, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0080] The technical solution described above is only one embodiment of the present application. For those skilled in the art, on the basis of the principles disclosed in the present application, various types of improvements or modifications can be easily made, and are not limited to the technical solution described in the above specific embodiments of the present application. Therefore, the foregoing description is only preferred, and is not limiting.

Claims

1. An optical fiber rapid deployment device within a wellbore, characterized by, The optical fiber storage bin is provided with a through hole in the top, and the optical fiber wound on the optical fiber reel extends out of the optical fiber storage bin through the through hole. The optical fiber comprises an optical fiber body, and an outer armored protective layer is arranged outside the optical fiber body. The wellbore optical fiber rapid deployment device further comprises a counterweight, and the counterweight is arranged at the lower end of the optical fiber storage bin. The optical fiber storage bin, the outer armored protective layer and the counterweight are all made of soluble materials.

2. The optical fiber rapid deployment device within a wellbore of claim 1, wherein, The optical fiber reel is provided with a circular hole, and the central axis of the circular hole coincides with the central axis of the optical fiber reel.

3. The optical fiber rapid deployment device within a wellbore of claim 2, wherein, The screw rod is inserted into the circular hole, and the diameter of the circular hole is greater than the outer diameter of the screw rod.

4. The optical fiber rapid deployment device within a wellbore of claim 3, wherein, The screw rod is horizontally arranged in the optical fiber storage bin, and the two ends of the screw rod are respectively welded on the inner side walls of the optical fiber storage bin. The circular hole provided on the optical fiber reel is a through hole, and the screw rod directly penetrates through the circular hole.

5. The rapid fiber optic deployment device within a wellbore of claim 3, wherein, The screw rod is vertically arranged in the optical fiber storage bin, and the bottom end of the screw rod is welded on the bottom in the optical fiber storage bin. The screw rod is inserted into the circular hole.

6. The rapid fiber optic deployment device within a wellbore of claim 1, wherein, The wellbore optical fiber rapid deployment device further comprises a ground fixed cable reel, the ground fixed cable reel is fixed on the ground, one end of the optical fiber is wound on the optical fiber reel of the optical fiber storage bin, and the other end is wound on the ground fixed cable reel through the through hole in the top of the optical fiber storage bin.

7. A method of using an optical fiber rapid deployment device in a wellbore, the method comprising: The method is applied to the wellbore optical fiber rapid deployment device of any one of claims 1-6. The top through hole of the optical fiber storage bin is extracted and then wound and fixed on the ground fixed cable reel, then the wellbore optical fiber rapid deployment device is lowered to the designated position, and is left until the counterweight, the optical fiber storage bin and the outer armored protective layer are dissolved, the high-temperature grease adheres the optical fiber to the inner wall of the casing, and the corresponding data collection work is started.

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