Optical cable shaft positioning method and device and storage medium

Abstract

The application provides a kind of optical cable well positioning method, device and storage medium, method includes: in the process of applying vibration to pipeline wall, two-dimensional space-time vibration signal collected from accompanying optical cable, and form intensity waterfall diagram, identify hammering point from intensity waterfall diagram, obtain V-shaped signal along hammering point to the two sides of pipeline wall, and determine the center meter mark of V-shaped signal, find the step signal generated by V-shaped signal along the two arms of V-shaped signal in intensity waterfall diagram, and determine the starting optical cable meter mark and the stop optical cable meter mark of step signal, obtain the ground position of optical cable well by the center meter mark of V-shaped signal and the starting optical cable meter mark and the stop optical cable meter mark of step signal.The application compared with the existing optical cable well positioning method is not limited by optical cable well positioning sequence, not limited by optical cable buried depth, and the characteristic of disc remains more prominent.In the field of long-distance pipeline, the precise and rapid positioning of optical cable well can be realized, and the safety protection level of pipeline is improved.

Description

Technical Field

[0001] This invention mainly relates to the field of optical cable positioning for long-distance oil and gas pipelines, specifically to a method, device, and storage medium for optical cable well positioning. Background Technology

[0002] During the production process, fiber optic cable wells are installed along the long-distance pipeline for fiber optic splicing, containing splice boxes and coiled fiber optic cables. Due to improper construction, ground markings for the fiber optic cable wells may be lost along the pipeline route. To prevent damage to the wells by third-party construction, it is necessary to accurately locate and mark their positions. Fiber optic cable well positioning mainly utilizes two technologies: electromagnetic induction and fiber optic vibration sensing.

[0003] Electromagnetic induction technology requires that when a metal detector fails to identify the pre-installed marker in a fiber optic cable manhole, each manhole must be excavated individually. An electromagnetic field is applied to the metal core of the fiber optic cable within each excavated manhole, and electromagnetic induction is then used on the ground to sequentially locate the next manhole. However, due to limitations in electromagnetic induction distance and sensitivity, if a manhole is located in an inaccessible area, subsequent manholes cannot be found.

[0004] Fiber optic vibration sensing technology involves connecting a fiber core of the accompanying optical cable to a fiber optic vibration sensing device. Manual personnel then repeatedly tap the ground along the pipeline to locate the cable manholes. The manholes are identified based on the intensity and width amplification characteristics of the vibration signal from the coiled optical cable. This technology requires consistent vibration intensity along the cable route and is primarily used for shallow-buried pipelines. For cable manholes buried deeper than 1 meter, it is susceptible to soil and human interference, making identification impossible. Furthermore, since the impact range of manual tapping on the cable cannot exceed ten meters, this technology is too densely spaced, making it time-consuming and labor-intensive for locating cable manholes in long-distance pipelines. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a method, device and storage medium for locating optical cable wells, which addresses the shortcomings of the prior art.

[0006] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: A method for locating optical cable wells, comprising the following steps:

[0007] Two-dimensional spatiotemporal vibration signals were collected from the accompanying optical cable during the process of applying vibration to the pipe wall;

[0008] An intensity waterfall diagram is generated based on the two-dimensional spatiotemporal vibration signal;

[0009] The impact point is identified from the intensity waterfall diagram, and a V-shaped signal propagating from the impact point to both sides of the pipe wall is obtained, and the center meter of the V-shaped signal is determined.

[0010] find the step signal generated by the V-shaped signal along the two arms of the V-shaped signal in the intensity waterfall diagram, and determine the start cable meter mark and the stop cable meter mark of the step signal;

[0011] The ground position of the cable well is obtained through the center meter mark of the V-shaped signal and the start cable meter mark and the stop cable meter mark of the step signal.

[0012] The cable well positioning method provided by the present application is not limited by the positioning sequence of the cable well, and can position the cable well as needed compared with the existing cable well positioning method based on electromagnetic induction; the cable well positioning method provided by the present application is not limited by the cable burial depth, and the discoloration feature is more prominent compared with the existing cable well positioning method based on fiber vibration, and in the field of long-distance pipelines, the accurate and rapid positioning of the cable well can be realized, and the safety protection level of the pipeline is improved.

[0013] Another technical solution for solving the above technical problems is as follows: a cable well positioning device comprises:

[0014] The acquisition module is configured to acquire a two-dimensional space-time vibration signal from the accompanying cable during the vibration applied to the pipeline wall;

[0015] The intensity waterfall diagram forming module is configured to form an intensity waterfall diagram according to the two-dimensional space-time vibration signal;

[0016] The positioning processing module is configured to identify a hammering point from the intensity waterfall diagram, obtain a V-shaped signal propagating along the hammering point to both sides of the pipeline wall, and determine a center meter mark of the V-shaped signal;

[0017] The start cable meter mark and the stop cable meter mark of the step signal are determined by finding the step signal generated by the V-shaped signal along the two arms of the V-shaped signal in the intensity waterfall diagram;

[0018] The ground position of the cable well is obtained through the center meter mark of the V-shaped signal and the start cable meter mark and the stop cable meter mark of the step signal.

[0019] Another technical solution for solving the above technical problems is as follows: a cable well positioning device comprises a memory, a processor, and a computer program stored in the memory and executable on the processor, and when the processor executes the computer program, the cable well positioning method as described above is implemented.

[0020] Another technical solution for solving the above technical problems is as follows: a computer readable storage medium stores a computer program, and when the computer program is executed by a processor, the cable well positioning method as described above is implemented. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1A flowchart of a cable well positioning method provided by an embodiment of the present application is shown in the figure;

[0022] Figure 2 A functional module block diagram of a cable well positioning device provided by an embodiment of the present application is shown in the figure.

[0023] Figure 3 A schematic diagram of a V-shaped signal generating step in a strength waterfall diagram provided by an embodiment of the present application is shown in the figure. DETAILED DESCRIPTION

[0024] The principles and features of the present application are described below in conjunction with the accompanying drawings, and the examples are used only to explain the present application and are not intended to limit the scope of the present application.

[0025] Embodiment 1

[0026] As shown in the figure, a cable well positioning method comprises the following steps: Figure 1

[0027] Collecting a two-dimensional space-time vibration signal of a companion cable in the process of applying vibration to the pipe wall of the pipeline;

[0028] Forming a strength waterfall diagram according to the two-dimensional space-time vibration signal;

[0029] Identifying a hammering point from the strength waterfall diagram, obtaining a V-shaped signal propagating along the hammering point to both sides of the pipe wall, and determining a center meter mark of the V-shaped signal;

[0030] Searching for a step signal generated by the V-shaped signal along the two arms of the V-shaped signal in the strength waterfall diagram, and determining a starting cable meter mark and an ending cable meter mark of the step signal;

[0031] Obtaining the ground position of the cable well through the center meter mark of the V-shaped signal and the starting cable meter mark and the ending cable meter mark of the step signal.

[0032] The cable well positioning method proposed by the present application, compared with the existing cable well positioning method based on electromagnetic induction, is not limited by the positioning sequence of the cable well and can position the cable well as needed; compared with the existing cable well positioning method based on fiber vibration, is not limited by the cable burial depth, and the discoloration feature is more prominent, and in the field of long-distance pipelines, the precise and rapid positioning of the cable well can be realized, and the safety protection level of the pipeline is improved.

[0033] Specifically, the two-dimensional space-time vibration signal is collected from the companion cable in the process of applying vibration to the pipe wall of the pipeline, specifically:

[0034] The distributed fiber sensing device is pre-arranged at the companion cable, and the two-dimensional space-time vibration signal during the vibration of the pipe wall is collected through the distributed fiber sensing device.

[0035] ​Specifically, the step of forming an intensity waterfall diagram based on the two-dimensional spatiotemporal vibration signal includes:

[0036] Vibration energy is obtained from the two-dimensional spatiotemporal vibration signal. The horizontal axis is set as the length of the optical cable, and the vertical axis is set as time. The upper side of the vertical axis is the old time, and the lower side is the new time. The value is the vibration energy. The left side of the horizontal axis is the near end of the optical cable, and the right side is the far end of the optical cable. Assuming that the vibration propagation speed of the pipe wall is v, the minimum cable coil length is L, the spatial resolution is less than or equal to L / v, and the temporal resolution is less than or equal to L, an intensity waterfall diagram is formed.

[0037] It should be understood that the current time is considered the new time, while the old time is the past time relative to the current time.

[0038] In the above embodiments, the V-shaped signal can be found quickly and accurately using the intensity waterfall plot.

[0039] Specifically, determining the center meter marker of the V-shaped signal involves:

[0040] The standard slope of the two arms of the V-shaped signal is 1 / v, and they are symmetrically distributed along the central meter mark, thereby determining the central meter mark s of the V-shaped signal.

[0041] Specifically, such as Figure 3 As shown, the step signal generated by the V-shaped signal is located along both arms of the V-shaped signal in the intensity waterfall diagram, and the starting and ending optical cable meter marks of the step signal are determined as follows:

[0042] In the intensity waterfall diagram, along the two arms of the V-shaped signal, the local slope is calculated. When the local slope changes abruptly from 1 / v to 0, the starting optical cable meter s1 is obtained from the step signal at that point. When the local slope changes abruptly from 0 to 1 / v, the stopping optical cable meter s2 is obtained from the step signal at that point, and the stopping optical cable meter s2 > the starting optical cable meter s1. The cable length Δs = s2 - s1.

[0043] In the above embodiments, the center meter marker s of the V-shaped signal and the starting and ending optical cable meter markers of the step signal can be obtained quickly and accurately, without being affected by soil or human interference, or by the optical cable distance.

[0044] Specifically, the method of obtaining the ground location of the optical cable well through the center meter marker of the V-shaped signal and the starting and ending optical cable meter markers of the step signal is as follows:

[0045] If the step signal is near the vertex of the V-shaped signal, that is, when the terminating optical cable meter s2 is less than the center meter s, the ground position of the optical cable well is calculated by the first formula, which is: d = c - s + s2, where d is the ground position of the optical cable well, c is the ground position of the test pit, s is the center meter of the V-shaped signal, and s2 is the terminating optical cable meter of the step signal.

[0046] If the step signal is at the far end of the V-shaped signal apex, that is, the starting optical cable meter mark s1 is greater than the center meter mark s, the ground position of the optical cable well is calculated by the second formula, which is: d = c - s + s1, where d is the ground position of the optical cable well, c is the ground position of the test pit, s is the center meter mark of the V-shaped signal, and s1 is the starting optical cable meter mark of the step signal.

[0047] In the above embodiments, the ground position of the optical cable well is obtained by using the center meter mark of the V-shaped signal and the starting and ending optical cable meter marks of the step signal, thereby achieving accurate and rapid positioning of the optical cable well and improving the safety protection level of the pipeline.

[0048] The following describes the practical application of the above-mentioned optical cable well positioning method:

[0049] Step 1: Excavate test pits directly above the pipeline every 5 kilometers or less, and manually strike the pipe wall with a hammer inside the test pits.

[0050] Step 2: Assuming the long-distance pipeline has a metal wall, and the propagation speed of vibration energy within the metal wall is no less than 1 km / s, set the minimum spatial resolution and spatial resolution based on the minimum cable length of the fiber optic cable well. For example, if the cable length in the fiber optic cable well is 10 meters, a time resolution of no more than 0.01 seconds is recommended. To ensure a clear step characteristic, the spatial resolution should be no greater than 10 meters.

[0051] Step 3: After vibration occurs at a point on the pipe wall, it propagates to both sides simultaneously, forming a V-shaped response image (V-shaped signal) on the intensity waterfall diagram. The slope is related to the vibration propagation speed of the pipe wall, and the length is the vibration propagation distance of the pipe wall. By continuously tapping the pipe wall or continuously impacting the weld, the relevant V-shaped signal is found. The horizontal coordinate of the vertex of the V-shaped signal is the optical cable meter mark position s that triggered the pipe wall vibration, and the ground test pit position is c at this time.

[0052] Step 4: Vibrational energy can be approximated as propagating at a uniform speed on the pipe wall. If there is no fiber optic cable well along the propagation path, it is a straight-line signal; if there is a fiber optic cable well along the propagation path, the vibration propagates instantaneously from one side of the well to the other, resulting in a lateral step in the straight-line signal, shifting outward on the horizontal axis of space. For example... Figure 3 As shown, the intensity waterfall diagram shows a V-shaped signal generating a step. The start and end points of the step are marked by meter markers s1 and s2 on either side of the cable manhole. The step length s2-s1 is the length of the cable coiled within the cable manhole, and s1... <s2<s。

[0053] Step 5: According to the step position and the cable distance of the V-shaped signal vertex, the ground position range of the cable well is found. At this time, the start and end cable meters of the cable well are near the V-shaped signal vertex, and the ground position of the cable well is c-s+s2.

[0054] Embodiment 2

[0055] As shown in Figure 2 A cable well positioning device comprises:

[0056] The acquisition module is configured to acquire a two-dimensional space-time vibration signal from the accompanying optical cable during the vibration applied to the pipe wall.

[0057] The intensity waterfall diagram forming module is configured to form an intensity waterfall diagram according to the two-dimensional space-time vibration signal.

[0058] The positioning processing module is configured to identify a hammering point from the intensity waterfall diagram, obtain a V-shaped signal propagating along the hammering point to both sides of the pipe wall, and determine a central meter mark of the V-shaped signal.

[0059] The positioning processing module is configured to identify a hammering point from the intensity waterfall diagram, obtain a V-shaped signal propagating along the hammering point to both sides of the pipe wall, and determine a central meter mark of the V-shaped signal.

[0060] The positioning processing module is configured to identify a hammering point from the intensity waterfall diagram, obtain a V-shaped signal propagating along the hammering point to both sides of the pipe wall, and determine a central meter mark of the V-shaped signal.

[0061] Specifically, in the intensity waterfall diagram forming module, the intensity waterfall diagram is formed according to the two-dimensional space-time vibration signal, specifically:

[0062] The vibration energy is obtained from the two-dimensional space-time vibration signal, the abscissa is set as the cable length, the ordinate is set as the time, the upper side of the ordinate is set as the old time, the lower side of the ordinate is set as the new time, the value is the vibration energy, the left side of the abscissa is set as the near end of the cable, the right side of the abscissa is set as the far end of the cable, the vibration propagation speed of the pipe wall is assumed to be v, the minimum cable length is L, the spatial resolution is less than or equal to L / v, and the time resolution is less than or equal to L, so as to form the intensity waterfall diagram.

[0063] Compared with the existing optical cable well positioning method based on electromagnetic induction, the optical cable well positioning method provided by the present application is not limited by the positioning sequence of the optical cable well and can position the optical cable well as needed. Compared with the existing optical cable well positioning method based on fiber vibration, the optical cable well positioning method provided by the present application is not limited by the optical cable depth and has more prominent cable characteristics. In the field of long-distance pipelines, the optical cable well can be accurately and quickly positioned, and the safety protection level of the pipeline can be improved.

[0064] Embodiment 3

[0065] An optical cable shaft positioning device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the optical cable shaft positioning method as described above is implemented.

[0066] Embodiment 4:

[0067] A computer readable storage medium, storing a computer program, when the computer program is executed by a processor, the optical cable shaft positioning method as described above is implemented.

[0068] It should be noted that, in this document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0069] The above descriptions are only the preferred embodiments of the present application, not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An optical cable shaft positioning method characterized by, The method comprises the following steps: Excavating a trench above the pipeline every 5 kilometers at most, and collecting two-dimensional space-time vibration signals from the accompanying optical cable during the process of applying vibration to the pipeline wall by manually hitting the pipeline wall with a hammer in the trench; Forming an intensity waterfall diagram according to the two-dimensional space-time vibration signals; Identifying a hammering point from the intensity waterfall diagram, obtaining a V-shaped signal propagating to both sides of the pipeline wall along the hammering point, and determining a central meter mark of the V-shaped signal; the determination of the central meter mark of the V-shaped signal is specifically as follows: the standard slope of the two arms of the V-shaped signal is 1 / v, and the two arms are symmetrically distributed along the central meter mark, so that the central meter mark s of the V-shaped signal is determined; During the process of uniform propagation of vibration energy on the pipeline wall, if there is no optical cable well in the propagation path, it is a straight line signal, if there is an optical cable well in the propagation path, the vibration propagates from one side of the optical cable well to the other side instantaneously, then the straight line signal produces a lateral step, which is translated outward on the spatial abscissa, and the step signal generated by the V-shaped signal is searched along the two arms of the V-shaped signal in the intensity waterfall diagram, and the starting optical cable meter mark and the stop optical cable meter mark of the step signal are determined; specifically, the local slope is calculated along the two arms of the V-shaped signal in the intensity waterfall diagram, when the local slope suddenly changes from 1 / v to 0, the starting optical cable meter mark s1 is obtained from the step signal at this point, when the local slope suddenly changes from 0 to 1 / v, the stop optical cable meter mark s2 is obtained from the step signal at this point, and the stop optical cable meter mark s2 is greater than the starting optical cable meter mark s1; The ground position of the optical cable well is obtained through the central meter mark of the V-shaped signal and the starting optical cable meter mark and the stop optical cable meter mark of the step signal, and specifically: If the step signal is near the vertex of the V-shaped signal, that is, the stop optical cable meter mark s2 is less than the central meter mark s, the ground position of the optical cable well is calculated through the first formula, and the first formula is d=c-s+s2, wherein d is the ground position of the optical cable well, c is the ground position of the trench, s is the central meter mark of the V-shaped signal, and s2 is the stop optical cable meter mark of the step signal; If the step signal is far from the vertex of the V-shaped signal, that is, the starting optical cable meter mark s1 is greater than the central meter mark s, the ground position of the optical cable well is calculated through the second formula, and the second formula is d=c-s+s1, wherein d is the ground position of the optical cable well, c is the ground position of the trench, s is the central meter mark of the V-shaped signal, and s1 is the starting optical cable meter mark of the step signal.

2. The method of claim 1, wherein, The process of collecting two-dimensional space-time vibration signals from the accompanying optical cable during the process of applying vibration to the pipeline wall is specifically as follows: A distributed optical fiber sensing device is arranged in advance at the accompanying optical cable, and the two-dimensional space-time vibration signals of the pipeline wall vibration are collected through the distributed optical fiber sensing device.

3. The method of claim 1, wherein, The intensity waterfall diagram formed according to the two-dimensional space-time vibration signals is specifically as follows: The vibration energy is obtained from the two-dimensional space-time vibration signals, the abscissa is set as the optical cable length, the ordinate is set as the time, the upper side of the ordinate is set as the old time, the lower side of the ordinate is set as the new time, the value is the vibration energy, the left side of the abscissa is set as the near end of the optical cable, and the right side of the abscissa is set as the far end of the optical cable, it is assumed that the vibration propagation speed of the pipeline wall is v, the minimum cable length is L, the spatial resolution is less than or equal to L / v, and the time resolution is less than or equal to L, so that the intensity waterfall diagram is formed.

4. An optical cable shaft positioning device, characterized by, The method comprises the following steps: a collection module, configured to collect a two-dimensional time-space vibration signal from a parallel optical cable during vibration is applied to the pipe wall; an intensity waterfall diagram forming module, configured to form an intensity waterfall diagram according to the two-dimensional time-space vibration signal; a positioning processing module, configured to identify a hammering point from the intensity waterfall diagram, obtain a V-shaped signal propagating along the hammering point to both sides of the pipe wall, and determine a central meter mark of the V-shaped signal; the determination of the central meter mark of the V-shaped signal is specifically: the standard slope of the two arms of the V-shaped signal is 1 / v, and the two arms are symmetrically distributed along the central meter mark, so that the central meter mark s of the V-shaped signal is determined; during the uniform propagation of vibration energy on the pipe wall, if there is no optical cable well in the propagation path, it is a straight line signal, if there is an optical cable well in the propagation path, the vibration propagates from one side of the optical cable well to the other side instantaneously, then the straight line signal produces a lateral step, which is translated outward on the spatial abscissa, and the step signal generated by the V-shaped signal is searched along the two arms of the V-shaped signal in the intensity waterfall diagram, and the starting optical cable meter mark and the stop optical cable meter mark of the step signal are determined; specifically: along the two arms of the V-shaped signal in the intensity waterfall diagram, the local slope is calculated, when the local slope suddenly changes from 1 / v to 0, the starting optical cable meter mark s1 is obtained from the step signal at this point, when the local slope suddenly changes from 0 to 1 / v, the stop optical cable meter mark s2 is obtained from the step signal at this point, and the stop optical cable meter mark s2> the starting optical cable meter mark s1; the ground position of the optical cable well is obtained through the central meter mark of the V-shaped signal and the starting optical cable meter mark and the stop optical cable meter mark of the step signal, specifically: if the step signal is near the vertex of the V-shaped signal, that is, the stop optical cable meter mark s2 is less than the central meter mark s, the ground position of the optical cable well is calculated through the first formula, the first formula is: d=c-s+s2, wherein d is the ground position of the optical cable well, c is the ground position of the pit, s is the central meter mark of the V-shaped signal, and s2 is the stop optical cable meter mark of the step signal; if the step signal is far from the vertex of the V-shaped signal, that is, the starting optical cable meter mark s1 is greater than the central meter mark s, the ground position of the optical cable well is calculated through the second formula, the second formula is: d=c-s+s1, wherein d is the ground position of the optical cable well, c is the ground position of the pit, s is the central meter mark of the V-shaped signal, and s1 is the starting optical cable meter mark of the step signal.

5. The optical cable shaft positioning device according to claim 4, characterized in that, In the intensity waterfall diagram forming module, the intensity waterfall diagram is formed according to the two-dimensional time-space vibration signal, specifically: the vibration energy is obtained from the two-dimensional time-space vibration signal, the abscissa is set as the optical cable length, the ordinate is set as the time, the upper side of the ordinate is set as the old time, the lower side of the ordinate is set as the new time, the value of the vibration energy is set as the time, the left side of the abscissa is set as the near end of the optical cable, and the right side of the abscissa is set as the far end of the optical cable, it is assumed that the vibration propagation speed of the pipe wall is v, the minimum cable length is L, the spatial resolution is less than or equal to L / v, and the time resolution is less than or equal to L, so that the intensity waterfall diagram is formed.

6. An optical cable shaft positioning apparatus comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, the optical cable well positioning method according to any one of claims 1 to 3 is realized.

7. A computer-readable storage medium storing a computer program, wherein the computer program comprises the following steps of: receiving a request for a resource from a client; determining whether the client is authorized to access the resource; and if the client is authorized to access the resource, providing the resource to the client. When the computer program is executed by the processor, the optical cable well positioning method according to any one of claims 1 to 3 is realized.

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