Device for quickly deploying optical fibers in shaft and using method

Abstract

The invention provides a device for rapidly deploying optical fibers in a shaft and a using method, and belongs to the technical field of seismic exploration and acquisition. The device comprises an optical fiber storage bin, a screw rod is fixed in the optical fiber storage bin, an optical fiber wire coil penetrates through the screw rod, and an optical fiber is wound on the optical fiber wire coil; a through hole is formed in the top of the optical fiber storage bin, and an optical fiber wound on the optical fiber wire coil penetrates through the through hole and extends out of the optical fiber storage bin. According to the invention, the optical fiber can be rapidly laid in a short time, the optical fiber storage bin and the outer armoring protection layer are made of soluble materials, and the high-temperature grease is filled between the outer armoring protection layer and the optical fiber, so that after the optical fiber storage bin and the outer armoring protection layer are dissolved, the optical fiber is adsorbed on the inner wall of the sleeve through the grease; the attenuation effect of the outer armor protection layer on optical fiber data acquisition signals is reduced, so that the signal sensing capacity is improved, the overall cost is lower, and the coupling capacity is higher.

Description

Technical Field

[0001] The invention belongs to the technical field of seismic exploration and acquisition, and in particular relates to a device for rapid deployment of optical fibers in a wellbore and a method for using the device. Background Art

[0002] The optical fiber in the casing is mostly in the form of photoelectric composite cable or optical fiber bundled in coiled tubing. Its advantages are that it can be reused and can be used with conventional detectors or crawlers, etc. Its disadvantages are poor coupling effect, long equipment deployment cycle, and high cost of long-term use. It is mostly used in VSP, production profile monitoring and adjacent well fracturing monitoring.

[0003] Existing bare optical fiber is usually lowered into the well directly by using the method of optical fiber with counterweight. The outside of the optical fiber is usually wrapped with an outer armor with a certain tensile strength (the outer armor is usually not as strong as steel wire armor due to cost constraints). When the optical fiber is lowered into the well and the signal is collected, the outer armor will attenuate the collected signal to a certain extent, affecting the signal perception ability. At the same time, during the lowering process of the existing optical fiber, there is no certain control over the speed and tension, which may easily cause the optical fiber to break due to excessive descent speed and excessive tension during the lowering process, thereby affecting the lowering speed of the optical fiber. Summary of the invention

[0004] The purpose of the present invention is to solve the problems existing in the above-mentioned prior art and to provide a device and method for rapid deployment of optical fiber in a wellbore, so as to achieve rapid deployment of optical fiber in a relatively short time, further reduce the attenuation effect of the outer armor on the signal, and thus increase the signal perception capability.

[0005] One of the purposes of the present invention is to provide a device for rapid deployment of optical fiber in a wellbore.

[0006] A second object of the present invention is to provide a method for using a device for rapid deployment of optical fiber in a wellbore.

[0007] The present invention is achieved through the following technical solutions:

[0008] A first aspect of the present invention provides a device for rapid deployment of optical fiber in a wellbore, comprising an optical fiber storage bin, wherein a screw is fixed in the optical fiber storage bin, an optical fiber reel is passed through the screw, and an optical fiber is wrapped around the optical fiber reel;

[0009] A through hole is provided 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] A further improvement of the present invention is:

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

[0012] A further improvement of the present invention is:

[0013] 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.

[0014] A further improvement of the present invention is:

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

[0016] A further improvement of the present invention is:

[0017] The screw rod is horizontally arranged in the optical fiber storage bin, and both ends of the screw rod are respectively welded to the inner side wall of the optical fiber storage bin;

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

[0019] A further improvement of the present invention is:

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

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

[0022] A further improvement of the present invention is:

[0023] The optical fiber rapid deployment device in the wellbore also includes a counterweight block, which is arranged at the lower end of the optical fiber storage bin.

[0024] A further improvement of the present invention is:

[0025] The optical fiber storage bin, the outer armor protective layer and the counterweight block are all made of soluble materials, wherein the soluble material 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 invention, since the optical fiber storage bin, outer armor protective layer and counterweight are all made of soluble materials, and high-temperature grease is filled between the outer armor protective layer and the optical fiber, after the optical fiber storage bin and the outer armor protective 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.

[0027] A further improvement of the present invention is:

[0028] The optical fiber rapid deployment device in the wellbore also includes a ground fixed cable drum, which 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 passes through the through hole on the top of the optical fiber storage bin and is wound on the ground fixed cable drum.

[0029] A second aspect of the present invention provides a method for using a device for rapid deployment of optical fibers in a wellbore, specifically comprising:

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

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

[0032] The present invention can achieve rapid deployment of optical fibers in a relatively short time, and at the same time further reduce the attenuation effect of the outer armor protective layer on the optical fiber data acquisition signal, thereby achieving increased signal perception capability.

[0033] In the present invention, since the optical fiber storage bin, outer armor protective layer and counterweight are all made of soluble materials, and high-temperature grease is filled between the outer armor protective layer and the optical fiber, after the optical fiber storage bin and the outer armor protective 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. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0035] Figure 2 It is a schematic structural diagram of the second type of optical fiber rapid deployment device in a wellbore of the present invention.

[0036] In the figure,

[0037] 1. Fiber optic storage warehouse;

[0038] 2. Screw;

[0039] 3. Optical fiber reel;

[0040] 4. Optical fiber;

[0041] 5. Counterweight;

[0042] 6. Ground fixed cable drum. DETAILED DESCRIPTION

[0043] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0044] [Example 1]

[0045] like Figure 1 and Figure 2 As shown, the present invention provides a device for rapid deployment of optical fiber in a wellbore, which is in the shape of a cone cylinder as a whole, and comprises an optical fiber storage bin 1, in which a screw rod 2 is fixed, and an optical fiber reel 3 is passed through the screw rod 2, and an optical fiber 4 is wrapped around the optical fiber reel 3;

[0046] A through hole is provided on the top of the optical fiber storage bin 1 , 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 bin 1 .

[0047] The optical fiber storage bin 1 is made of soluble material and can be a cuboid, cylinder, polyhedron, etc. with a cavity structure, and its shape is not specifically limited. The soluble material 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.

[0048] The optical fiber 4 includes an optical fiber body, an outer armor protective layer is arranged outside the optical fiber body, and high-temperature grease is filled between the outer armor protective layer and the optical fiber body. The high-temperature grease is grease with a temperature resistance of more than 150°C, which is usually related to the target well temperature. If the well temperature exceeds 150°C, grease with a temperature resistance of 200°C is selected.

[0049] The outer armor protective layer is made of soluble material, 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.

[0050] Since the optical fiber storage bin 1 and the outer armor protective layer are both made of soluble materials, after the optical fiber rapid deployment device in the wellbore is placed in a designated position in a vertical well or a horizontal well, it is left stationary for a certain period of time to wait for the optical fiber storage bin and the outer armor protective layer to dissolve, and the high-temperature grease adheres the optical fiber to the inner wall of the casing to start the corresponding data collection work.

[0051] The present invention can realize rapid deployment of optical fiber in a relatively short time. Since the optical fiber storage bin and the outer armor protective layer are both made of soluble materials, and high-temperature grease is filled between the outer armor protective layer and the optical fiber, after the optical fiber storage bin and the outer armor protective layer are dissolved, the optical fiber is adsorbed on the inner wall of the casing through the grease, reducing the attenuation effect of the outer armor protective layer on the optical fiber data acquisition signal, thereby increasing the signal perception capability, with lower overall cost and stronger coupling capability.

[0052] [Example 2]

[0053] The optical fiber reel 3 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 .

[0054] The screw rod 2 is inserted into a circular hole, and the diameter of the circular hole is larger than the outer diameter of the screw rod 2. In this way, when the optical fiber 4 is pulled out from the through hole at the top of the optical fiber storage bin 1, or the entire device is placed in a specified position in a vertical well or a horizontal well, the resistance is reduced to avoid excessive pulling force that may cause the optical fiber to break.

[0055] [Example 3]

[0056] The screw rod 2 is welded on 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] like Figure 1 As shown, 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 wall of the optical fiber storage bin 1 by welding. At this time, the circular hole arranged on the optical fiber reel 3 is a through hole, and the screw rod 2 directly passes through the circular hole.

[0058] like Figure 2 As shown, 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 circular hole arranged on the optical fiber reel 3 can be a through hole or a hole with a closed top, and the screw rod 2 can be inserted into the circular hole.

[0059] When the screw rod 2 is vertically arranged in the optical fiber storage bin 1 , the optical fiber reel 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 optical fiber rapid deployment device in the wellbore also includes a counterweight block 5, which is arranged at the lower end of the optical fiber storage bin 1. The counterweight block 5 is a soluble bridge plug or is made of a soluble material. The soluble material can be a lipid such as polyvinyl alcohol or other soluble resin materials, or an aluminum-magnesium alloy or other metal soluble materials. No specific requirements are made here.

[0062] Preferably, the lower end of the counterweight block 5 is a vertebral structure, and more preferably a cone, so that the reduced resistance is conducive to the smooth lowering of the optical fiber rapid deployment device in the wellbore in a relatively high density well fluid.

[0063] [Example 5]

[0064] The optical fiber rapid deployment device in the wellbore also includes a ground fixed cable drum 6, which is fixed on the ground. One end of the optical fiber 4 is wound around the optical fiber reel 3 in the optical fiber storage warehouse 1, and the other end passes through the through hole at the top of the optical fiber storage warehouse 1 and is wound around the ground fixed cable drum 6.

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

[0066] [Example 6]

[0067] The present invention provides a method for using a device for rapidly deploying optical fibers in a wellbore. The structure of the device for rapidly deploying optical fibers in a wellbore is as follows: Figure 1 and Figure 2 As shown, it includes an optical fiber storage bin 1, which is made of soluble material. A screw rod 2 is fixed inside the optical fiber storage bin 1, and an optical fiber reel 3 is passed through the screw rod 2, and an optical fiber 4 is wrapped around the optical fiber reel 3; a through hole is provided on the top of the optical fiber storage bin 1, and the optical fiber 4 wrapped on the optical fiber reel 3 passes through the through hole and extends out of the optical fiber storage bin 1 and is wrapped around a ground fixed cable reel 6; the optical fiber 4 includes an optical fiber body, and an outer armor protective layer is arranged outside the optical fiber body, and the outer armor protective layer is made of soluble material, and high-temperature grease is filled between the outer armor protective layer and the optical fiber body, and the high-temperature grease is grease with a temperature resistance of more than 150°C, which is usually related to the target well temperature. If the well temperature exceeds 150°C, grease with a temperature resistance of 200°C is selected.

[0068] The optical fiber rapid deployment device in the wellbore also includes a counterweight block 5, which is arranged at the lower end of the optical fiber storage bin 1. The counterweight block 5 is a soluble bridge plug or is made of a soluble material.

[0069] Since the optical fiber storage bin 1, the outer armor protective layer and the counterweight block 5 are all made of soluble materials, after the optical fiber rapid deployment device in the wellbore is placed in the designated position in the vertical well or horizontal well, it is left stationary for a certain period of time to wait for the optical fiber storage bin and the outer armor protective layer to dissolve, and the high-temperature grease adheres the optical fiber to the inner wall of the casing to start the corresponding data collection work.

[0070] The specific usage is:

[0071] (1) For vertical wells, the optical fiber 4 is pulled out from the top through hole of the optical fiber storage bin 1 and reversely wound on the ground fixed cable drum 6. After winding and fixing, the optical fiber rapid deployment device in the entire wellbore is placed into the casing and freely falls into the well fluid. The optical fiber in the optical fiber storage bin is brought out by its own gravity. When the outer armor protective layer on the optical fiber is subjected to excessive tension, part of the optical fiber on the ground fixed cable drum is released to avoid cable breakage caused by excessive tension.

[0072] It should be noted that the tension coefficient of the outer armor protective layer on the optical fiber 4 can be determined during the manufacturing process. The tension monitoring system of the cable winch can be referred to, and the tension of the outer armor protective layer can be obtained using a tension sensor. When the limit value is reached 60%, the cable is released. The release speed can be controlled by the motor system. The initial release speed is 0.1m / s. If the tension continues to increase, the release speed is accelerated. If the tension no longer increases and does not exceed 70% of the limit value, the current speed is maintained until the release ends.

[0073] (2) For horizontal wells, after the optical fiber storage bin 1 is pulled out through the top through hole at the wellhead, it must pass through the wellhead blowout prevention device and then be wound and fixed on the ground fixed cable drum 6. If necessary, the entire optical fiber can be wound on the ground fixed cable drum 6, and then the optical fiber rapid deployment device in the entire wellbore is pumped to the specified position at a constant speed by injecting liquid.

[0074] (3) Regardless of whether it is a vertical well or a horizontal well, after the optical fiber rapid deployment device reaches the designated position in the entire wellbore, it is left to stand for 24 hours, waiting for the counterweight block 5, the optical fiber storage bin 1 and the outer armor protective layer to dissolve, and the high-temperature grease to adhere the optical fiber to the inner wall of the casing, and then the corresponding data collection work is started.

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

[0076] The present invention can achieve rapid deployment of optical fibers in a relatively short time, and at the same time further reduce the attenuation effect of the outer armor protective layer on the optical fiber data acquisition signal, thereby achieving increased signal perception capability.

[0077] In the present invention, since the optical fiber storage bin 1, the outer armor protective layer and the counterweight block 5 are all made of soluble materials, and high-temperature grease is filled between the outer armor protective layer and the optical fiber, after the optical fiber storage bin and the outer armor protective 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 invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0079] In the description of the present invention, unless otherwise specified, the terms "upper", "lower", "left", "right", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0080] The above technical solution is only one implementation mode of the present invention. For those skilled in the art, it is easy to make various types of improvements or modifications based on the principles disclosed in the present invention, and it is not limited to the technical solution described in the above specific embodiments of the present invention. Therefore, the above description is only preferred and does not have a restrictive meaning.

Claims

1. A device for rapid deployment of optical fiber in a wellbore, characterized in that: It comprises an optical fiber storage bin, in which a screw is fixed, an optical fiber reel is passed through the screw, and an optical fiber reel is wrapped with an optical fiber; A through hole is provided 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.

2. The optical fiber rapid deployment device in a wellbore according to claim 1, characterized in that: The optical fiber comprises an optical fiber body, an outer armor protection layer is arranged outside the optical fiber body, and high-temperature grease is filled between the outer armor protection layer and the optical fiber body.

3. The optical fiber rapid deployment device in a wellbore according to claim 1, characterized in that: 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.

4. The optical fiber rapid deployment device in a wellbore according to claim 1, characterized in that: The screw rod is inserted into the circular hole, and the diameter of the circular hole is larger than the outer diameter of the screw rod.

5. The optical fiber rapid deployment device in a wellbore according to claim 4, characterized in that: The screw rod is horizontally arranged in the optical fiber storage bin, and both ends of the screw rod are respectively welded to the inner side wall of the optical fiber storage bin; The circular hole arranged on the optical fiber reel is a through hole, and the screw rod directly passes through the circular hole.

6. The optical fiber rapid deployment device in a wellbore according to claim 4, characterized in that: The screw rod is vertically arranged in the optical fiber storage bin, and the bottom end of the screw rod is welded to the bottom of the optical fiber storage bin; The screw is inserted into the circular hole.

7. The optical fiber rapid deployment device in a wellbore according to claim 2, characterized in that: The optical fiber rapid deployment device in the wellbore also includes a counterweight block, which is arranged at the lower end of the optical fiber storage bin.

8. The optical fiber rapid deployment device in a wellbore according to claim 7, characterized in that: The optical fiber storage bin, the outer armor protection layer and the counterweight block are all made of soluble materials.

9. The optical fiber rapid deployment device in a wellbore according to claim 1, characterized in that: The optical fiber rapid deployment device in the wellbore also includes a ground fixed cable drum, which 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 passes through the through hole on the top of the optical fiber storage bin and is wound on the ground fixed cable drum.

10. A method for using a device for rapid deployment of optical fiber in a wellbore, characterized in that: Specifically: The top through hole of the optical fiber storage bin is pulled out and then wound and fixed on the ground fixed cable drum. Then the optical fiber rapid deployment device in the wellbore is lowered to the designated position and left to stand until the counterweight block, optical fiber storage bin and outer armor protective layer are dissolved, and 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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