A monitoring system for use in a petroleum well

Abstract

The utility model relates to the technical field of oil well exploitation, and the technical problem that the utility model wants to solve is that there is no system for detecting damage of casing for oil well. In order to solve the above technical problem, the utility model provides a kind of monitoring system for under oil well. The utility model includes: distributed multi-core optical fiber, spiral is wound in casing inner wall;Optical fiber early warning equipment, including frame structure, shell, integrated module and multiple shockproof components;Shell is covered on frame structure, and integrated module is connected on shell;Shockproof component is connected on frame structure, for shock attenuation;Host computer server;Distributed multi-core optical fiber is connected with the port of optical fiber early warning equipment, and optical fiber early warning equipment and host computer server are electrically connected. The utility model application can monitor the position and damaged degree of casing damage in real time, and can be applicable to the scene of violent vibration under oil well.

Description

Technical Field

[0001] This utility model relates to the field of oil well extraction technology, and in particular to a monitoring system for oil wells. Background Technology

[0002] In recent years, the number of newly added wells with casing damage in oil and gas fields has increased significantly, highlighting prominent wellbore quality issues. Casing damage can prevent the smooth insertion of bridge plugs during fracturing, severely impacting the timely execution of subsequent operations. Therefore, it is necessary to inspect the casing condition to determine the location and extent of damage in oil and gas fields.

[0003] Therefore, it is necessary to design a monitoring system that can monitor the location and extent of casing damage in real time and is applicable to scenarios with severe vibrations in oil wells. Utility Model Content

[0004] Therefore, the technical problem to be solved by this utility model is to overcome the above-mentioned problems existing in the prior art.

[0005] To solve the above-mentioned technical problems, this utility model provides a monitoring system for oil wells, comprising:

[0006] Distributed multi-core optical fiber, spirally wound on the inner wall of the sleeve;

[0007] Fiber optic early warning equipment includes a frame structure, outer shell, integrated module, and multiple earthquake-resistant components;

[0008] The outer shell covers the frame structure, and the integrated modules are connected to the outer shell; the seismic components are connected to the frame structure for vibration reduction.

[0009] Host computer server;

[0010] Among them, the distributed multi-core optical fiber is connected to the port of the optical fiber early warning device, and the optical fiber early warning device is electrically connected to the host computer server.

[0011] In one embodiment of this utility model, a fan is provided on the inner wall of the top of the housing for heat dissipation and cooling of the integrated module.

[0012] In one embodiment of this utility model, the frame structure includes multiple uprights and multiple crossbars; the crossbars and uprights are fixedly connected in a cross shape.

[0013] In one embodiment of the present invention, the fiber optic early warning device further includes two connecting plates; located below the integrated module in the frame structure, the two connecting plates are spaced apart from top to bottom.

[0014] In one embodiment of this utility model, the seismic-resistant component includes multiple seismic-resistant parts; the seismic-resistant parts include triangular steel and friction plates; the two right-angled sides of the triangular steel are respectively provided with waist-shaped holes; the waist-shaped holes on the two right-angled sides of the triangular steel are respectively connected to the column and the connecting plate, and friction plates are respectively provided between the triangular steel and the column, and between the triangular steel and the connecting plate.

[0015] In one embodiment of this utility model, the waist-shaped holes on the two right-angled sides of the triangular steel are respectively connected to the column and the connecting plate by multiple bolts.

[0016] In one embodiment of the present invention, the seismic component further includes a plurality of spaced elastic elements connected between two connecting plates.

[0017] In one embodiment of this utility model, the static radius of curvature of the distributed multi-core optical fiber is not less than 10 times the outer diameter of the optical fiber.

[0018] In one embodiment of this utility model, the integrated module includes a laser acoustic modulation and demodulation module, an NPU processing module, and a power board control module; wherein the laser acoustic modulation and demodulation module and the NPU processing module are connected; and the power board control module is connected to the laser acoustic modulation and demodulation module and the NPU processing module.

[0019] In one embodiment of this utility model, the laser acoustic modulation and demodulation module includes an EDFA fiber amplifier module, a BPD photodetector, an AOM acousto-optic modulator module, and an NL laser module; wherein, the NL laser module is connected to the AOM acousto-optic modulator module, the AOM acousto-optic modulator module is connected to the EDFA fiber amplifier module, and the EDFA fiber amplifier module is connected to the BPD photodetector.

[0020] The above-mentioned technical solution of this utility model has the following advantages compared with the prior art:

[0021] The monitoring system for downhole oil wells described in this utility model utilizes a fiber optic early warning device capable of collecting OSD (Optical Distance Detection) data files of varying optical signals from distributed multi-core optical fibers. This data is transmitted as raw data to a host computer server. The host computer server analyzes and processes the raw data files sent by the fiber optic early warning device, generating necessary alarm information which is then sent back to the fiber optic early warning device for information reassembly and early warning of potential threats. Furthermore, this application incorporates anti-vibration components into the fiber optic early warning device, providing shock resistance to the device placed on-site, thus better adapting to oil well operation scenarios. Therefore, this application can monitor the location and extent of casing damage in real time and is applicable to scenarios with severe vibrations in oil wells. Attached Figure Description

[0022] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein:

[0023] Figure 1 This is a schematic diagram of the structure of a monitoring system for oil wells in a preferred embodiment of the present invention;

[0024] Figure 2 yes Figure 1 Internal schematic diagram of fiber optic early warning equipment used in a monitoring system for oil wells;

[0025] Figure 3 yes Figure 2 Enlarged view of point A;

[0026] Explanation of markings on the attached diagrams: 100, Distributed multi-core optical fiber;

[0027] 200. Sleeve;

[0028] 300. Fiber optic early warning equipment; 310. Frame structure; 311. Column; 312. Crossbar; 320. Housing; 330. Fan; 340. Connecting plate; 341. Cavity; 350. Seismic components; 351. Triangular steel; 352. Friction pad; 353. Oblong hole; 354. Bolt; 360. Elastic element; 370. Laser acoustic wave modulation and demodulation module; 380. NPU processing module; 390. Power board control module;

[0029] 400. Host computer server. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0031] Reference Figures 1-3 As shown, this utility model embodiment provides a monitoring system for oil wells, including:

[0032] Distributed multi-core optical fiber 100 is spirally wound on the inner wall of sleeve 200;

[0033] The fiber optic early warning device 300 includes a frame structure 310, a housing 320, an integrated module, and multiple anti-vibration components. The housing 320 covers the frame structure 310, and the integrated module is connected to the housing 320. The anti-vibration components are connected to the bottom of the frame structure 310 to provide vibration reduction for the integrated module. The fiber optic early warning device 300 is placed directly at the oil well site.

[0034] Host computer server 400; in some embodiments, host computer server 400 may be located in a remote control room.

[0035] Among them, the distributed multi-core optical fiber 100 is connected to the port of the optical fiber early warning device 300, and the optical fiber early warning device 300 is electrically connected to the host computer server 400.

[0036] This application utilizes distributed multi-core optical fiber 100 for downhole parameter monitoring in oil wells. Specifically, the distributed multi-core optical fiber 100 is deployed in a spiral arrangement on the inner wall of the casing 200 and the cement sheath. By collecting changes in optical signals and then analyzing the data through a host computer, potential safety issues can be detected in a timely manner, such as wellbore integrity, pipeline leaks, and construction around pipelines. This allows for timely alerts to personnel to take measures to prevent accidents and ensure the safety of oil and gas field operations. Furthermore, it can monitor downhole temperature, vibration, and other parameters in real time, enabling better assessment of wellbore integrity and the production status of each layer. This helps in developing more effective extraction strategies, extending the lifespan of oil and gas fields, and maximizing the extraction of recoverable reserves.

[0037] Specifically, the fiber optic early warning device 300 of this application can collect the OSD data file of the changing optical signal from the distributed multi-core optical fiber 100, transmit it as the raw data file to the host computer server 400, and the host computer server 400 analyzes and processes the raw data file sent by the fiber optic early warning device 300 to generate necessary alarm information, which is then sent back to the fiber optic early warning device 300 for information reconstructing and early warning of threat events. Furthermore, this application incorporates anti-vibration components on the fiber optic early warning device 300 to provide anti-vibration protection for the device placed on-site, making it more suitable for oil well operation scenarios. Therefore, this application can monitor the location and extent of damage to the casing 200 in real time and is applicable to scenarios with severe vibrations in oil wells.

[0038] Compared to electronic sensors, the distributed multi-core fiber optic 100 is not limited by material lifespan, is not prone to aging in the high temperature and high pressure environment of oil wells, and does not require frequent replacement. Furthermore, the distributed multi-core fiber optic 100 exhibits significantly higher stability in high-temperature environments above 370℃ than traditional logging equipment.

[0039] Furthermore, a fan 330 is provided on the inner wall of the top of the housing 320 for heat dissipation and cooling of the integrated module. Specifically, since the temperature in oil well applications is relatively high, the integrated module may overheat. Therefore, this application provides a fan 330 on the top of the housing 320, which allows air to blow downwards from the top of the integrated module to dissipate heat and cool it, thereby improving the service life of the integrated module.

[0040] Furthermore, the frame structure 310 includes multiple columns 311 and multiple crossbars 312; the crossbars 312 are fixedly connected to the columns 311 in a cross shape.

[0041] Furthermore, the fiber optic early warning device 300 also includes two connecting plates 340; located below the integrated module in the frame structure 310, the two connecting plates 340 are spaced apart from top to bottom. Specifically, in this embodiment, the arrangement of the two connecting plates 340 can improve the supporting strength of the integrated module; on the other hand, since the fiber optic early warning device 300 is placed directly at the oil well site, the cavity 341 formed between the connecting plates 340 can improve the waterproof and dustproof performance of the fiber optic early warning device 300.

[0042] Furthermore, the seismic-resistant component includes multiple seismic-resistant parts 350; each seismic-resistant part 350 includes a triangular steel 351 and a friction plate 352; the two right-angled sides of the triangular steel 351 are respectively provided with oblong holes 353; the oblong holes 353 on the two right-angled sides of the triangular steel 351 are respectively connected to the column 311 and the connecting plate 340, and friction plates 352 are respectively provided between the triangular steel 351 and the column 311, and between the triangular steel 351 and the connecting plate 340. Specifically, in this embodiment, the vibration energy is dissipated by the frictional sliding between the triangular steel 351 and the friction plate 352, thereby achieving the seismic-resistant effect.

[0043] Furthermore, the oblong holes 353 on the two right-angled sides of the triangular steel 351 are connected to the column 311 and the connecting plate 340 respectively by multiple bolts 354.

[0044] Furthermore, the seismic stabilizing component also includes a plurality of spaced elastic elements 360 connected between two connecting plates 340. In some embodiments, the elastic elements 360 may be springs. Specifically, in this embodiment, the elastic elements 360 can dissipate vibration energy in the vertical direction through deformation of the elastic elements 360.

[0045] Furthermore, the static radius of curvature of the distributed multi-core optical fiber 100 is not less than 10 times the outer diameter of the optical fiber. Specifically, when the distributed multi-core optical fiber 100 is wound and fixed, the static radius of curvature of the distributed multi-core optical fiber 100 is not less than 10 times the outer diameter of the optical fiber, and a dynamic radius of more than 20 times the outer diameter of the optical fiber must be maintained during the deployment process to avoid damage to the optical fiber.

[0046] In some embodiments, the distributed multi-core optical fiber 100 is fixed to the inner wall of the sleeve 200 using clamps every 1.5m-2m. The clamps must be fitted with insulating rubber pads to prevent friction and arcing risks.

[0047] In some embodiments, the down-drilled distributed multi-core optical fiber 100 needs to be protected by a galvanized steel pipe, and the opening of the sleeve 200 is sealed with fireproof putty.

[0048] Furthermore, the integrated module includes a laser acoustic modulation / demodulation module 370, an NPU processing module 380, and a power board control module 390; wherein the laser acoustic modulation / demodulation module 370 and the NPU processing module 380 are connected; the power board control module 390 is connected to both the laser acoustic modulation / demodulation module 370 and the NPU processing module 380. Specifically, the NPU processing module 380 is primarily a hardware chip designed to accelerate artificial intelligence and deep learning tasks. The power board control module 390 supplies power to the laser acoustic modulation / demodulation module 370 and the NPU processing module 380.

[0049] Furthermore, the laser acoustic modulation and demodulation module 370 includes an EDFA fiber amplifier module, a BPD photodetector, an AOM acousto-optic modulator module, and an NL laser module. The NL laser module is connected to the AOM acousto-optic modulator module, which in turn is connected to the EDFA fiber amplifier module, and the EDFA fiber amplifier module is connected to the BPD photodetector. Specifically, the NL laser module emits the laser, the AOM acousto-optic modulator module performs acousto-optic modulation, stabilizing the laser power and obtaining a stable laser pulse sequence. The EDFA fiber amplifier module amplifies the light. The BPD photodetector detects minute changes in the effective signal from interference noise.

[0050] This application uses distributed multi-core optical fiber 100 for monitoring, eliminating the risk of missed detection, achieving continuous monitoring of the entire well section, meeting the needs of long-distance and large-scale monitoring, and having strong anti-interference capabilities.

[0051] This application can detect wellbore integrity, pipeline leaks, and construction around pipelines; data can be collected, analyzed, and alarms can be triggered locally (at the location of the oil well) without uploading to the cloud.

[0052] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A monitoring system for oil wells, characterized in that: include: Distributed multi-core optical fiber, spirally wound on the inner wall of the sleeve; Fiber optic early warning equipment includes a frame structure, outer shell, integrated module, and multiple earthquake-resistant components; The outer shell covers the frame structure, and the integrated module is connected to the outer shell; the seismic-resistant component is connected to the frame structure for vibration reduction. Host computer server; The distributed multi-core optical fiber is connected to the port of the optical fiber early warning device, and the optical fiber early warning device is electrically connected to the host computer server.

2. The monitoring system for oil wells according to claim 1, characterized in that: A fan is provided on the inner wall of the top of the housing to dissipate heat and cool the integrated module.

3. The monitoring system for oil wells according to claim 1, characterized in that: The frame structure includes multiple uprights and multiple crossbars; the crossbars are fixedly connected to the uprights in a cross shape.

4. The monitoring system for oil wells according to claim 3, characterized in that: The fiber optic early warning device also includes two connecting plates; located below the integrated module in the frame structure, the two connecting plates are spaced apart from top to bottom.

5. The monitoring system for oil wells according to claim 4, characterized in that: The seismic-resistant assembly includes multiple seismic-resistant components; each seismic-resistant component includes a triangular steel and friction plates; the two right-angled sides of the triangular steel are respectively provided with oblong holes; the oblong holes on the two right-angled sides of the triangular steel are respectively connected to the column and the connecting plate, and friction plates are respectively provided between the triangular steel and the column, and between the triangular steel and the connecting plate.

6. The monitoring system for oil wells according to claim 5, characterized in that: The oblong holes on the two right-angled sides of the triangular steel are connected to the column and the connecting plate respectively by multiple bolts.

7. The monitoring system for oil wells according to claim 5, characterized in that: The seismic-resistant component also includes a plurality of spaced elastic elements, which are connected between the two connecting plates.

8. The monitoring system for oil wells according to claim 1, characterized in that: The static radius of curvature of the distributed multi-core optical fiber is not less than 10 times the outer diameter of the optical fiber.

9. The monitoring system for oil wells according to claim 1, characterized in that: The integrated module includes a laser acoustic modulation and demodulation module, an NPU processing module, and a power board control module; wherein the laser acoustic modulation and demodulation module and the NPU processing module are connected; and the power board control module is connected to the laser acoustic modulation and demodulation module and the NPU processing module.

10. The monitoring system for oil wells according to claim 9, characterized in that: The laser acoustic modulation and demodulation module includes an EDFA fiber amplifier module, a BPD photodetector, an AOM acousto-optic modulator module, and an NL laser module; wherein, the NL laser module is connected to the AOM acousto-optic modulator module, the AOM acousto-optic modulator module is connected to the EDFA fiber amplifier module, and the EDFA fiber amplifier module is connected to the BPD photodetector.

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