Pipe wall acoustic wave monitoring and positioning method and device

Abstract

The present invention relates to the technical field of pipeline leakage monitoring, and is a pipe wall type sonic wave monitoring and positioning method and device. The former comprises receiving a first sonic wave signal from each collection point according to a number of collection points arranged at various positions on an oil and gas transportation pipeline; extracting the sonic wave characteristics of the first sonic wave signal and a reference sonic wave signal; judging whether the sonic wave characteristics of the first sonic wave signal and the reference sonic wave signal are consistent to find a leakage signal; traversing until all first sonic wave signals judged to be leakage signals are found; the present invention shortens the process from the generation to the collection of the first sonic wave signal by evenly arranging a number of collection points along the length direction of the oil and gas transportation pipeline, can reduce the influence of background noise on the first sonic wave signal, and at the same time has the characteristics of being able to effectively monitor smaller leaks, reduce errors during monitoring, reduce missed alarms and false alarms, effectively improve the accuracy and repeatability of leak positioning, facilitate staff to quickly locate leaks, and reduce safety hazards.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline leakage monitoring, and relates to a pipe wall type sonic wave monitoring and positioning method and device. Background Art

[0002] Currently, commonly used pipeline leakage monitoring and positioning devices usually use a two-point type, that is, an acoustic signal sensor is installed at each end of the pipeline. When judging a leak, the method used is to collect the acoustic signal generated by the pipeline through the acoustic signal sensors at both ends of the pipeline, and determine whether the amplitude of the collected acoustic signal is significantly different from the preset signal to determine whether there is a leak in the pipeline. This judgment method is subject to background noise interference in the pipeline, and the acoustic signal sensors at both ends of the pipeline are far apart, which makes it easy for the background noise to affect the original acoustic signal, causing the amplitude of the original acoustic signal to change, resulting in large monitoring errors and the inability to monitor smaller leaks. At the same time, when locating the leak point, the existing pipeline leakage monitoring and positioning device only locates the leak point based on the time difference between the signals reaching the sensors at both ends, resulting in low positioning accuracy, making it difficult for staff to repair and inspect, and easily leading to irreparable losses. Summary of the Invention

[0003] The present invention provides a pipe wall acoustic wave monitoring and positioning method and device, which overcomes the shortcomings of the above-mentioned existing technologies and can effectively solve the problem that the original acoustic wave signal monitored in the existing pipeline leakage monitoring method is greatly interfered by background noise, which easily causes large monitoring errors and cannot detect smaller leaks.

[0004] One of the technical solutions of the present invention is achieved through the following measures: a pipe wall acoustic wave monitoring and positioning method, comprising:

[0005] According to a plurality of collection points arranged at various positions on the oil and gas transportation pipeline, a first sound wave signal of each collection point is received;

[0006] Presetting a reference sound wave signal, and extracting sound wave features of the first sound wave signal and the reference sound wave signal, wherein the reference sound wave signal is a sound wave signal generated when the pipeline is leak-free, and the sound wave features include a differential value and a power spectrum;

[0007] Determine whether the acoustic wave characteristics of the first acoustic wave signal and the reference acoustic wave signal are consistent. If so, the first acoustic wave signal is a non-leakage signal; if not, the first acoustic wave signal is a leakage signal, and an alarm message is issued;

[0008] All first sound wave signals are traversed until all first sound wave signals determined to be leakage signals are found.

[0009] The following are further optimizations and / or improvements to the above technical solutions:

[0010] The above may further include processing all first sound wave signals determined to be leakage signals, and determining the leakage occurrence time according to the processing results, specifically including:

[0011] Searching and extracting all abnormal bands of a first sound wave signal determined to be a leakage signal;

[0012] Calculating the energy proportion of each positive polarity region and each negative polarity region in the first sound wave signal in the total energy of the first sound wave signal;

[0013] Determine the negative polarity region where the leakage occurs based on the abnormal band and energy ratio, and use the negative polarity region as the first time interval;

[0014] The first time interval is divided into a plurality of second time intervals, and the second time interval with the largest difference value is found, and the starting point of the second time interval is used as the leakage occurrence time.

[0015] The above-mentioned process of determining the negative polarity region at the time of leakage occurrence based on the abnormal waveband and energy ratio, and taking the negative polarity region as the first time interval, may include:

[0016] According to a preset reference value, a negative polarity region having an energy proportion greater than the reference value is determined;

[0017] Determine whether the negative polarity area meets all preset judgment conditions. If so, the leakage occurs in the negative polarity area, and the negative polarity area is defined as the first time interval, wherein the judgment conditions include: judgment condition one: the negative polarity area is located in the abnormal band of the first sound wave signal; judgment condition two: the energy proportion of the positive polarity area adjacent to the negative polarity area is not greater than the reference value.

[0018] The above-mentioned splitting of the first time interval into a plurality of second time intervals, searching for the second time interval with the largest difference value, and taking the starting point of the second time interval as the leakage occurrence time may include:

[0019] Splitting the first time interval according to a preset width to obtain a plurality of second time intervals, wherein the preset width is 25 to 50 points;

[0020] Perform a difference on each second time interval to determine a second time interval with the largest difference value, and the starting point of the second time interval is the time when the leakage occurs.

[0021] The above method may further include determining the location of the leakage point according to the time of leakage occurrence after determining the time of leakage occurrence, specifically including:

[0022] Extracting a time tag of each collection point receiving a first acoustic wave signal at a time when a leak has been determined to have occurred, wherein the time tag is the time when the collection point receives the first acoustic wave signal at the time when the leak has been determined to have occurred;

[0023] Compare the time of leakage occurrence with the time tag of each collection point, determine the two time tags with the smallest difference from the time of leakage occurrence, and determine the two collection points corresponding to the two time tags;

[0024] The position of the leakage point is determined according to the phase difference generated when the first sound wave signal reaches the two collection points.

[0025] The second technical solution of the present invention is achieved by the following measures: a pipe wall type acoustic wave monitoring and positioning device, including a leakage judgment unit, the leakage judgment unit includes:

[0026] A receiving module receives a first sound wave signal from a plurality of collection points arranged at various locations on the oil and gas transportation pipeline;

[0027] a feature extraction module, presetting a reference sound wave signal, and extracting sound wave features of the first sound wave signal and the reference sound wave signal, wherein the reference sound wave signal is a sound wave signal generated when the pipeline is leak-free, and the sound wave features include a difference value and a power spectrum;

[0028] a judgment module, judging whether the acoustic wave characteristics of the first acoustic wave signal and the reference acoustic wave signal are consistent; if so, the first acoustic wave signal is a non-leakage signal; if not, the first acoustic wave signal is a leakage signal, and an alarm message is issued;

[0029] The traversal module traverses all first sound wave signals until all first sound wave signals determined to be leakage signals are found.

[0030] The following are further optimizations and / or improvements to the above technical solutions:

[0031] The above may further include a leakage time acquisition unit, which includes:

[0032] An abnormal band extraction module searches for and extracts all abnormal bands of a first sound wave signal that is determined to be a leakage signal;

[0033] an energy proportion calculation module, calculating the energy proportion of each positive polarity region and each negative polarity region in the first sound wave signal in the total energy of the first sound wave signal;

[0034] A time interval determination module determines a negative polarity region at the time of leakage occurrence based on the abnormal band and energy ratio, and uses the negative polarity region as the first time interval;

[0035] The leakage time determination module divides the first time interval into a plurality of second time intervals, searches for the second time interval with the largest difference value, and uses the starting point of the second time interval as the leakage occurrence time.

[0036] The above may further include a leakage locating unit, which includes:

[0037] A time tag extraction module extracts the time tag of each collection point receiving a first sound wave signal at a time when a leak has been determined to have occurred, wherein the time tag is the time when the collection point receives the first sound wave signal at the time when the leak has been determined to have occurred;

[0038] The collection point positioning module compares the time of leakage occurrence with the time tag of each collection point, determines the two time tags with the smallest difference from the time of leakage occurrence, and determines the two collection points corresponding to the above two time tags;

[0039] The leakage point positioning module determines the position of the leakage point according to the phase difference generated when the first sound wave signal reaches the two collection points.

[0040] The third technical solution of the present invention is achieved through the following measures: an electronic device, including a processor and a memory, wherein the memory stores a computer program, and the computer program is loaded and executed by the processor to implement a pipe wall acoustic wave monitoring and positioning method.

[0041] The present invention shortens the process from the generation to the collection of the first sound wave signal by evenly arranging several collection points along the length direction of the oil and gas transportation pipeline, and can reduce the influence of background noise on the first sound wave signal. At the same time, compared with the method in the prior art to monitor whether the pipeline is leaking by judging whether the amplitude of the sound wave signal generated by the pipeline is significantly different from that of the preset signal, the method of the present invention to monitor whether the pipeline is leaking by judging whether the sound wave characteristics of each first sound wave signal are completely consistent with the sound wave characteristics of the reference sound wave signal is more accurate, can effectively monitor smaller leaks, reduce errors during monitoring, and reduce missed and false alarms. In addition, in the present invention, the preset width is determined by summarizing the characteristics of the leakage signal, the interval containing the time when the leakage occurs is divided to determine the starting point of the leakage, and the leakage point is located according to the phase difference between the starting point and the leakage signal arriving at the collection point, effectively improving the accuracy and repeatability of leak positioning, facilitating staff to quickly locate leaks, and reducing safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Attachment Figure 1 This is a flow chart of the leakage judgment method in the present invention.

[0043] Attachment Figure 2 This is a flow chart of the method for determining leakage time in the present invention.

[0044] Attachment Figure 3 This is a flow chart of the method for locating a leakage point in the present invention.

[0045] Attachment Figure 4 This is a flow chart of the method for leak monitoring and locating in the present invention.

[0046] Attachment Figure 5 Schematic diagram of the structure of the leakage judgment unit in the present invention.

[0047] Attachment Figure 6 Schematic diagram of the structure of the leakage moment acquisition unit in the present invention.

[0048] Attachment Figure 7 Schematic diagram of the structure of the leakage locating unit in the present invention. DETAILED DESCRIPTION

[0049] The present invention is not limited to the following embodiments, and specific implementation methods can be determined based on the technical solutions of the present invention and actual conditions.

[0050] The present invention will be further described below in conjunction with the embodiments and accompanying drawings:

[0051] Example 1, as attached Figure 1 As shown, an embodiment of the present invention discloses a pipe wall acoustic wave monitoring and positioning method, comprising:

[0052] Step S101, receiving a first acoustic wave signal from each of the plurality of acquisition points arranged at various locations on the oil and gas transportation pipeline;

[0053] In step S101, collection points are arranged at intervals along the length of the oil and gas transportation pipeline.

[0054] Step S102: presetting a reference sound wave signal, and extracting sound wave features of the first sound wave signal and the reference sound wave signal, wherein the reference sound wave signal is a sound wave signal generated when the pipeline is leak-free, and the sound wave features include a difference value and a power spectrum;

[0055] Step S103, determining whether the acoustic wave characteristics of the first acoustic wave signal and the reference acoustic wave signal are consistent; if so, the first acoustic wave signal is a non-leakage signal; if not, the first acoustic wave signal is a leakage signal, and an alarm message is issued;

[0056] In step S103, determining whether the sound wave features of the first sound wave signal and the reference sound wave signal are consistent includes:

[0057] Determine whether the difference between the first sound wave signal and the reference sound wave signal is completely consistent. If not, the first sound wave signal is a leakage signal. If so, compare the power spectra of the first sound wave signal and the reference sound wave signal.

[0058] It is determined whether the power spectra of the first sound wave signal and the reference sound wave signal are completely consistent. If not, the first sound wave signal is a leakage signal. If so, the first sound wave signal is a non-leakage signal.

[0059] Step S104 , traversing all first sound wave signals until all first sound wave signals determined to be leakage signals are found.

[0060] In an embodiment of the present invention, a plurality of collection points are evenly arranged along the length direction of the oil and gas transportation pipeline, and a first sound wave signal collected by each collection point is received. The sound wave value of each first sound wave signal is compared with the sound wave characteristics of the reference sound wave signal to determine whether the pipeline is leaking. By using the above method, the process from the generation to the collection of the first sound wave signal can be shortened, thereby reducing the impact of background noise on the first sound wave signal. Compared with the method of monitoring whether the pipeline is leaking by judging whether the amplitude of the sound wave signal generated by the pipeline is significantly different from that of the preset signal in the prior art, the method of monitoring whether the pipeline is leaking by judging whether the sound wave characteristics of each first sound wave signal are completely consistent with the sound wave characteristics of the reference sound wave signal in the present invention is more accurate, can effectively monitor smaller leaks, reduce errors during monitoring, and reduce missed alarms and false alarms.

[0061] Example 2, as attached Figure 2 As shown, an embodiment of the present invention discloses a pipe wall acoustic wave monitoring and positioning method, which also includes processing all first acoustic wave signals determined to be leakage signals and determining the leakage occurrence time according to the processing results, specifically including:

[0062] Step S201, searching and extracting all abnormal bands of a first sound wave signal determined to be a leakage signal;

[0063] In step S201, the judgment condition of the abnormal band is determined using the existing well-known 3σ principle. Assuming that under normal circumstances, the power spectrum of a specific frequency point is uniformly distributed, it is determined whether the power spectrum of the selected specific frequency point in the power spectrum of the i-th segment signal of the first sound wave signal satisfies the following formula. If so, the i-th segment signal in the first sound wave signal belongs to the abnormal band. If not, the i-th segment signal in the first sound wave signal does not belong to the abnormal band. The specific formula is as follows:

[0064] |pow(i)-MeanV|≥3σ

[0065] Wherein, pow(i) is the power spectrum of the selected specific frequency point in the power spectrum of the i-th segment signal of the first sound wave signal, and MeanV is the mean value of the power spectrum of the selected specific frequency point within a time period of the normal first sound wave signal.

[0066] The above-mentioned specific frequency point is selected according to actual needs, and may be 0.4 Hz, and the time period may be 2 minutes.

[0067] Step S202, calculating the energy proportion of each positive polarity region and each negative polarity region in the first sound wave signal in the total energy of the first sound wave signal;

[0068] In step S202, the division into positive polarity regions and negative polarity regions includes:

[0069] Obtaining a power average value of the first sound wave signal, comparing the signal power of each point in the first sound wave signal with the power average value, classifying a signal whose signal power is not less than the power average value as a positive polarity signal, and a signal whose signal power is less than the power average value as a negative polarity signal;

[0070] The area with continuous positive polarity signals is classified as a positive polarity area, and the area with continuous negative polarity signals is classified as a negative polarity area, forming a number of alternating positive polarity areas and negative polarity areas.

[0071] In step S202, determining the energy proportion includes:

[0072] The energy of all positive polarity regions and negative polarity regions in the first sound wave signal is calculated respectively, and then the total energy of the first sound wave signal is calculated to determine the proportion of the energy of each positive polarity region and negative polarity region in the total energy of the first sound wave signal.

[0073] Step S203, determining a negative polarity region whose energy proportion is greater than the reference value according to a preset reference value;

[0074] In step S203, the reference value is determined according to actual conditions.

[0075] Step S204, determine whether the negative polarity area meets all preset judgment conditions. If so, the leakage occurs in the negative polarity area, and the negative polarity area is defined as the first time interval. If not, the leakage occurs not in the negative polarity area, and return to step S203 to find other negative polarity areas whose energy proportion is greater than the reference value. The judgment conditions include: judgment condition one: the negative polarity area is located in the abnormal band of the first sound wave signal, and judgment condition two: the energy proportion of the positive polarity area adjacent to the negative polarity area is not greater than the reference value.

[0076] In step S204, when the negative polarity area with an energy ratio greater than the reference value belongs to an abnormal band, and the energy ratio of the adjacent positive polarity area thereafter is not greater than the reference value, it means that the first sound wave signal corresponding to the negative polarity area has an abnormal falling edge, and there is an obvious rise after the abnormal falling edge. The waveform change is consistent with the waveform characteristics of the leakage signal. Based on this, the waveform characteristics of the above leakage signal are used to construct judgment conditions one and judgment conditions two in this step, and the negative polarity area where the leakage occurs is found through the judgment conditions.

[0077] Step S205: Split the first time interval according to a preset width to obtain a plurality of second time intervals, wherein the preset width is 25 to 50 points;

[0078] Step S206 , performing a difference on each second time interval, and taking the starting point of the second time interval with the largest difference value as the leakage occurrence time.

[0079] Since the leakage signal has an obvious falling edge, the width of the falling edge is usually 50 points, and when leakage occurs, the corresponding first sound wave signal has a continuous monotonous fast-decreasing small interval. The width of the fast-decreasing small interval varies depending on the working conditions. Usually, when the first time interval is divided according to the width of 25 points, it is easier to obtain the fast-decreasing small interval. Therefore, in step S205, the preset width is set to 25 to 50 points;

[0080] When the preset width is 50 points, the first time interval is divided into several second time intervals according to the width of 50 points, and each second time interval is differentiated. The second time interval with the largest differential value contains the time when the leakage occurs.

[0081] When the preset width is 25 points, the first time interval is divided into several second time intervals according to the width of 25 points, and each second time interval is differentiated, and the starting point of the second time interval with the largest differential value is taken as the leakage occurrence time;

[0082] Compared with a preset width of 50 points, the error in leak point positioning is smaller when the preset width is 25 points, which can effectively improve the accuracy and repeatability of leak point positioning. Therefore, it is preferred to set the preset width to 25 points.

[0083] Example 3, as attached Figure 3 As shown, the embodiment of the present invention discloses a pipe wall acoustic wave monitoring and positioning method, which further includes determining the location of the leakage point according to the leakage occurrence time after determining the leakage occurrence time, specifically including:

[0084] Step S301, extracting the time tag of each collection point receiving a first sound wave signal at a time when a leak has been determined to have occurred, wherein the time tag is the time when the collection point receives the first sound wave signal at the time when the leak has been determined to have occurred;

[0085] Step S302: Compare the leakage occurrence time with the time tag of each collection point, determine the two time tags with the smallest difference from the leakage occurrence time, and determine the two collection points corresponding to the two time tags;

[0086] Step S303 : determining the position of the leakage point according to the phase difference generated when the first sound wave signal reaches the two acquisition points.

[0087] In step S303 , because the phases of sound waves generated at different locations in space are different, the position of the leakage point can be determined based on the phase difference generated when the first sound wave signal reaches the two collection points.

[0088] The embodiment of the present invention discloses a pipe wall type acoustic wave monitoring and positioning method. By locating the leakage point by the above method, the positioning accuracy can be improved, the staff can be facilitated to quickly locate the leak, and the safety hazards can be reduced.

[0089] Example 4, as attached Figure 4 As shown, an embodiment of the present invention discloses a pipe wall acoustic wave monitoring and positioning method, comprising:

[0090] Step S401, receiving a first acoustic wave signal collected by each of the plurality of collection points arranged at various locations on the oil and gas transportation pipeline;

[0091] Step S402: Perform sliding average filtering on all first sound wave signals to obtain a second sound wave signal corresponding to each first sound wave signal. The specific formula is as follows:

[0092] Wherein, f0(i) is the first sound wave signal, i=1, 2, 3…DT, f(j) is the second sound wave signal, j=1, 2, 3…(12000-DT), DT is the signal length of the sliding average filter;

[0093] Step S403: presetting a reference acoustic wave signal, performing differential filtering on the reference acoustic wave signal, obtaining a third acoustic wave signal, and extracting acoustic wave features of the third acoustic wave signal, wherein the reference acoustic wave signal is an acoustic wave signal generated when the pipeline is leak-free, and the acoustic wave features include a differential value and a power spectrum;

[0094] Step S404, performing differential filtering on a second sound wave signal to obtain a fourth sound wave signal, and extracting the sound wave features of the fourth sound wave signal;

[0095] Step S405: Determine whether the acoustic wave characteristics of the third acoustic wave signal and the fourth acoustic wave signal are consistent. If so, the fourth acoustic wave signal type is a non-leakage signal, and return to step S404 to search for other second acoustic wave signals and perform differential filtering on them to obtain the corresponding fourth acoustic wave signal, and extract the acoustic wave characteristics of the fourth acoustic wave signal. If not, the fourth acoustic wave signal type is a leakage signal, and proceed to step S406;

[0096] Step S406: searching and extracting all abnormal bands in the fourth sound wave signal determined to be a leakage signal. The method of searching and extracting abnormal bands in this embodiment is consistent with the method of searching and extracting abnormal bands in the above embodiment, and will not be described in detail.

[0097] Step S407: Calculate the energy proportion of each positive polarity region and each negative polarity region in the fourth sound wave signal to the total energy of the fourth sound wave signal. The method for dividing the positive polarity region and the negative polarity region and the method for obtaining the energy proportion in this embodiment are consistent with the method for dividing the positive polarity region and the negative polarity region and the method for obtaining the energy proportion in the above embodiment, and will not be repeated here.

[0098] Step S408, determining a negative polarity region whose energy proportion is greater than the reference value according to a preset reference value;

[0099] Step S409, determining whether the negative polarity region meets all preset judgment conditions. If so, determining that the leakage occurs in the negative polarity region, defining the negative polarity region as the first time interval, and proceeding to step S410. If not, returning to step S408, searching for other negative polarity regions whose energy proportion is greater than the reference value, wherein the judgment conditions include: judgment condition 1: the negative polarity region is located in the abnormal band of the fourth sound wave signal; judgment condition 2: the energy proportion of the positive polarity region adjacent to the negative polarity region is not greater than the reference value;

[0100] Step S410: Split the first time interval according to a preset width to obtain a plurality of second time intervals, wherein the preset width is 25 to 50 points;

[0101] Step S411, performing a difference on each second time interval, and taking the starting point of the second time interval with the largest difference value as the leakage occurrence time;

[0102] Step S412, extracting the time tag of each collection point receiving the first sound wave signal corresponding to the fourth sound wave signal at the time when the leakage has been determined to have occurred, wherein the time tag is the time when the collection point receives the first sound wave signal corresponding to the fourth sound wave signal at the time when the leakage has been determined to have occurred;

[0103] Step S413: Compare the leakage occurrence time with the time tag of each collection point, determine the two time tags with the smallest difference from the leakage occurrence time, and determine the two collection points corresponding to the two time tags;

[0104] Step S414, determining the location of the leakage point based on the phase difference between the first sound wave signal corresponding to the fourth sound wave signal at the time of leakage occurrence determined above and the two acquisition points;

[0105] Step S415: issue an alarm message and return to step S404 to search for other second sound wave signals and perform differential filtering on them to obtain the corresponding fourth sound wave signal and extract the sound wave feature of the fourth sound wave signal until all second sound wave information is traversed.

[0106] An embodiment of the present invention discloses a pipe wall type sonic wave monitoring and positioning method, which obtains a second sonic wave signal by filtering a first sonic wave signal, obtains a fourth sonic wave signal by filtering the second sonic wave signal, and obtains a third sonic wave signal by filtering a reference sonic wave signal. This method can reduce noise interference and make leakage judgment more accurate. Moreover, whether a leakage occurs and the leakage point are located based on the third sonic wave signal and the fourth sonic wave signal, which can improve the accuracy of leakage judgment and leakage point location and reduce the loss and damage caused by leakage in the gas transportation pipeline.

[0107] Example 5, as attached Figure 5 As shown, an embodiment of the present invention discloses a pipe wall type acoustic wave monitoring and positioning device, including a leakage judgment unit, which includes:

[0108] A receiving module receives a first sound wave signal from a plurality of collection points arranged at various locations on the oil and gas transportation pipeline;

[0109] a feature extraction module, presetting a reference sound wave signal, and extracting sound wave features of the first sound wave signal and the reference sound wave signal, wherein the reference sound wave signal is a sound wave signal generated when the pipeline is leak-free, and the sound wave features include a difference value and a power spectrum;

[0110] a judgment module, judging whether the acoustic wave characteristics of the first acoustic wave signal and the reference acoustic wave signal are consistent; if so, the first acoustic wave signal is a non-leakage signal; if not, the first acoustic wave signal is a leakage signal, and an alarm message is issued;

[0111] The traversal module traverses all first sound wave signals until all first sound wave signals determined to be leakage signals are found.

[0112] Example 6, as attached Figure 6 As shown, the embodiment of the present invention discloses a pipe wall type acoustic wave monitoring and positioning device, which also includes a leakage time acquisition unit, and the leakage time acquisition unit includes:

[0113] An abnormal band extraction module searches for and extracts all abnormal bands of a first sound wave signal that is determined to be a leakage signal;

[0114] an energy proportion calculation module, calculating the energy proportion of each positive polarity region and each negative polarity region in the first sound wave signal in the total energy of the first sound wave signal;

[0115] A time interval determination module determines a negative polarity region at the time of leakage occurrence based on the abnormal band and energy ratio, and uses the negative polarity region as the first time interval;

[0116] The leakage time determination module divides the first time interval into a plurality of second time intervals, searches for the second time interval with the largest difference value, and uses the starting point of the second time interval as the leakage occurrence time.

[0117] Example 7, as attached Figure 7 As shown, the embodiment of the present invention discloses a pipe wall type acoustic wave monitoring and positioning device, which also includes a leakage positioning unit, and the leakage positioning unit includes:

[0118] A time tag extraction module extracts the time tag of each collection point receiving a first sound wave signal at a time when a leak has been determined to have occurred, wherein the time tag is the time when the collection point receives the first sound wave signal at the time when the leak has been determined to have occurred;

[0119] The collection point positioning module compares the time of leakage occurrence with the time tag of each collection point, determines the two time tags with the smallest difference from the time of leakage occurrence, and determines the two collection points corresponding to the above two time tags;

[0120] The leakage point positioning module determines the position of the leakage point according to the phase difference generated when the first sound wave signal reaches the two collection points.

[0121] Example 8. An embodiment of the present invention discloses an electronic device, including a processor and a memory, wherein the memory stores a computer program, and the computer program is loaded and executed by the processor to implement a pipe wall acoustic wave monitoring and positioning method.

[0122] The electronic device further includes a transmission device and an input / output device, wherein the transmission device and the input / output device are both connected to the processor.

[0123] The processors described above may be central processing units (CPUs), general-purpose processors (GPRSs), digital signal processors (DSPs), ASICs, FPGAs, or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. They may implement or execute the various exemplary logic blocks, modules, and circuits described in conjunction with the disclosure herein. They may also be combinations that implement computing functions, such as a combination of one or more microprocessors, a combination of a DSP and a microprocessor, and so forth.

[0124] The above-mentioned memory may include, but is not limited to, various media that can store computer programs, such as a USB flash drive, a read-only memory, a mobile hard disk, a magnetic disk, or an optical disk.

[0125] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Non-essential technical features can be added or removed according to actual needs to meet the requirements of different situations.

Claims

1. A pipe wall acoustic wave monitoring and positioning method, characterized in that The following steps are involved: According to a plurality of collection points arranged at various positions on the oil and gas transportation pipeline, a first sound wave signal of each collection point is received; Presetting a reference sound wave signal, and extracting sound wave features of the first sound wave signal and the reference sound wave signal, wherein the reference sound wave signal is a sound wave signal generated when the pipeline is leak-free, and the sound wave features include a differential value and a power spectrum; Determine whether the acoustic wave characteristics of the first acoustic wave signal and the reference acoustic wave signal are consistent. If so, the first acoustic wave signal is a non-leakage signal; if not, the first acoustic wave signal is a leakage signal, and an alarm message is issued; Traversing all first sound wave signals until all first sound wave signals determined to be leakage signals are found; Processing all first sound wave signals determined to be leakage signals and determining the leakage occurrence time according to the processing results, including: Searching and extracting all abnormal bands of a first sound wave signal determined to be a leakage signal; Calculating the energy proportion of each positive polarity region and each negative polarity region in the first sound wave signal in the total energy of the first sound wave signal; Determine the negative polarity region where the leakage occurs based on the abnormal band and energy ratio, and use the negative polarity region as the first time interval; Split the first time interval into a plurality of second time intervals, and find the second time interval with the largest difference value, and use the starting point of the second time interval as the time when the leakage occurs; The division of the positive polarity region and the negative polarity region includes: Obtaining a power average value of the first sound wave signal, comparing the signal power of each point in the first sound wave signal with the power average value, classifying a signal whose signal power is not less than the power average value as a positive polarity signal, and a signal whose signal power is less than the power average value as a negative polarity signal; The area with continuous positive polarity signals is classified as a positive polarity area, and the area with continuous negative polarity signals is classified as a negative polarity area, forming a number of alternating positive polarity areas and negative polarity areas; According to the abnormal band and energy ratio, a negative polarity area at the time of leakage is determined, and the negative polarity area is used as the first time interval, including: According to a preset reference value, a negative polarity region having an energy proportion greater than the reference value is determined; Determine whether the negative polarity region meets all preset judgment conditions. If so, the leakage occurs in the negative polarity region, and the negative polarity region is defined as a first time interval. The judgment conditions include: judgment condition 1: the negative polarity region is located in the abnormal band of the first sound wave signal; judgment condition 2: the energy proportion of the positive polarity region adjacent to the rear of the negative polarity region is not greater than the reference value; The first time interval is divided into a plurality of second time intervals, and the second time interval with the largest difference value is found, and the starting point of the second time interval is used as the leakage occurrence time, including: Splitting the first time interval according to a preset width to obtain a plurality of second time intervals, wherein the preset width is 25 to 50 points; A difference is performed on each second time interval, and the starting point of the second time interval with the largest difference value is taken as the leakage occurrence time.

2. The pipe wall acoustic wave monitoring and positioning method according to claim 1, characterized in that: The method also includes determining the location of the leakage point according to the time of leakage after the leakage occurs, specifically including: Extracting a time tag of each collection point receiving a first acoustic wave signal at a time when a leak has been determined to have occurred, wherein the time tag is the time when the collection point receives the first acoustic wave signal at the time when the leak has been determined to have occurred; Compare the time of leakage occurrence with the time tag of each collection point, determine the two time tags with the smallest difference from the time of leakage occurrence, and determine the two collection points corresponding to the two time tags; The position of the leakage point is determined according to the phase difference generated when the first sound wave signal reaches the two collection points.

3. A pipe wall acoustic wave monitoring and positioning device using the method according to claim 1 or 2, characterized in that: It includes a leakage judgment unit and a leakage time acquisition unit; The leakage judgment unit includes: A receiving module receives a first sound wave signal from a plurality of collection points arranged at various locations on the oil and gas transportation pipeline; a feature extraction module, presetting a reference sound wave signal, and extracting sound wave features of the first sound wave signal and the reference sound wave signal, wherein the reference sound wave signal is a sound wave signal generated when the pipeline is leak-free, and the sound wave features include a difference value and a power spectrum; a judgment module, judging whether the acoustic wave characteristics of the first acoustic wave signal and the reference acoustic wave signal are consistent; if so, the first acoustic wave signal is a non-leakage signal; if not, the first acoustic wave signal is a leakage signal, and an alarm message is issued; A traversal module traverses all first sound wave signals until all first sound wave signals determined to be leakage signals are found; The leakage time acquisition unit includes: An abnormal band extraction module searches for and extracts all abnormal bands of a first sound wave signal that is determined to be a leakage signal; an energy proportion calculation module, calculating the energy proportion of each positive polarity region and each negative polarity region in the first sound wave signal in the total energy of the first sound wave signal; A time interval determination module determines a negative polarity region at the time of leakage occurrence based on the abnormal band and energy ratio, and uses the negative polarity region as the first time interval; The leakage time determination module divides the first time interval into a plurality of second time intervals, searches for the second time interval with the largest difference value, and uses the starting point of the second time interval as the leakage occurrence time.

4. The pipe wall type acoustic wave monitoring and positioning device according to claim 3, characterized in that: It also includes a leakage locating unit, which includes: A time tag extraction module extracts the time tag of each collection point receiving a first sound wave signal at a time when a leak has been determined to have occurred, wherein the time tag is the time when the collection point receives the first sound wave signal at the time when the leak has been determined to have occurred; The collection point positioning module compares the time of leakage occurrence with the time tag of each collection point, determines the two time tags with the smallest difference from the time of leakage occurrence, and determines the two collection points corresponding to the above two time tags; The leakage point positioning module determines the position of the leakage point according to the phase difference generated when the first sound wave signal reaches the two collection points.

5. An electronic device, characterized in that: The system comprises a processor and a memory, wherein a computer program is stored in the memory, and the computer program is loaded and executed by the processor to implement the pipe wall acoustic wave monitoring and positioning method according to claim 1 or 2.

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