Pipe wall type sound wave monitoring and positioning method and device

Abstract

The invention relates to the technical field of pipeline leakage monitoring, in particular to a pipe wall type sound wave monitoring and positioning method and device.The pipe wall type sound wave monitoring and positioning method comprises the steps that first sound wave signals of all collection points are received according to the multiple collection points arranged at all positions on an oil and gas transportation pipeline; extracting sound wave characteristics of the first sound wave signal and the reference sound wave signal; judging whether the sound wave characteristics of the first sound wave signal and the reference sound wave signal are consistent or not to find out a leakage signal; traversing until all the first sound wave signals which are judged to be leakage signals are found out; according to the invention, the plurality of collection points are uniformly arranged on the oil and gas transportation pipeline along the length direction, so that the process from generation to collection of the first sound wave signal is shortened, the influence of background noise on the first sound wave signal can be reduced, meanwhile, relatively small leakage can be effectively monitored, the monitoring error is reduced, and the situations of missing report and false report are reduced; the leakage positioning precision and repeatability are effectively improved, workers can conveniently and quickly position leakage, and potential safety hazards are reduced.

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] At present, the commonly used pipeline leakage monitoring and positioning device usually uses 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 judge 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, because there is background noise interference in the pipeline, and the acoustic signal sensors at both ends of the pipeline are far apart, 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 a large monitoring error, and unable to monitor smaller leaks. At the same time, when locating the leakage point, the existing pipeline leakage monitoring and positioning device only locates it through 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 overhaul, and easily leading to irreparable losses. Summary of the invention

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

[0004] One of the technical solutions of the present invention is achieved by the following measures: a pipe wall type sound 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, extracting the 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 not leaking, 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 also 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] Find and extract all abnormal bands of a first sound wave signal determined to be a leakage signal;

[0012] Calculate 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] According to the abnormal band and energy proportion, a negative polarity area at the time of leakage is determined, and the negative polarity area is used 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 taken as the leakage occurrence time.

[0015] The above-mentioned method of determining the negative polarity region at the time when the leakage occurs according to the abnormal band and the energy proportion, 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, 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.

[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] Each second time interval is differentiated to determine a second time interval with the largest differential value, and the starting point of the second time interval is the time when the leakage occurs.

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

[0022] Extracting the time tag of each collection point receiving a first sound wave signal at a time when the leakage has been determined to occur, wherein the time tag is the time when the collection point receives the first sound wave signal at the time when the leakage has been determined to occur;

[0023] Compare the time when the leakage occurs with the time label of each collection point, determine the two time labels with the smallest difference from the time when the leakage occurs, and determine the two collection points corresponding to the two time labels;

[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 sound 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 each collection point according to a plurality of collection points arranged at various positions on the oil and gas transportation pipeline;

[0027] A feature extraction module is configured to pre-set a reference sound wave signal and extract 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 not leaking, and the sound wave features include a differential value and a power spectrum;

[0028] A judging 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, the leakage time acquisition unit 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 calculates 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 when leakage occurs according to the abnormal band and energy proportion, 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, the leakage locating unit comprising:

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

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

[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 evenly sets a number of collection points along the length direction of the oil and gas transportation pipeline to shorten the process from the generation to the collection of the first sound wave signal, thereby reducing the influence of background noise on the first sound wave signal. At the same time, compared with the method in the prior art that monitors whether the pipeline is leaking by judging whether the amplitude of the sound wave signal generated by the pipeline is greatly different from that of the preset signal, the method in the present invention that monitors 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 has higher accuracy, can effectively monitor smaller leaks, reduce errors during monitoring, and reduce the situation of missed reports 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, thereby effectively improving the accuracy and repeatability of leakage location, facilitating the staff to quickly locate the leakage, and reducing safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

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

[0046] Attached Figure 5 It is a structural schematic diagram of the leakage judgment unit in the present invention.

[0047] Attached Figure 6 It is a structural schematic diagram of the leakage time acquisition unit in the present invention.

[0048] Attached Figure 7 It is a structural schematic diagram of the leakage locating unit in the present invention. DETAILED DESCRIPTION

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

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

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

[0052] Step S101, receiving a first sound wave signal from each collection point according to a plurality of collection points arranged at various positions on the oil and gas transportation pipeline;

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

[0054] Step S102, presetting a reference sound wave signal, 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 in a non-leaking state, and the sound wave features include a differential 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 value 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 yes, 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] The embodiment of the present invention evenly sets a number of collection points along the length direction of the oil and gas transportation pipeline, receives the first sound wave signal collected by each collection point, compares the sound wave value of each first sound wave signal with the sound wave feature of the reference sound wave signal, and determines 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 influence 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 feature of each first sound wave signal is completely consistent with the sound wave feature of the reference sound wave signal in the present invention has higher accuracy, can effectively monitor smaller leaks, reduce errors during monitoring, and reduce missed alarms and false alarms.

[0061] Embodiment 2, as attached Figure 2 As shown, the embodiment of the present invention discloses a pipe wall type acoustic wave monitoring and positioning method, which also includes processing all first acoustic wave signals judged as 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 by 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 specific frequency point selected 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 specific frequency point selected in a time period of the normal first sound wave signal.

[0066] The above-mentioned specific frequency point is selected according to actual needs, which 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 of the positive polarity region and the negative polarity region 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, so as to form a plurality of alternating positive polarity areas and negative polarity areas.

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

[0072] The energies of all positive polarity regions and negative polarity regions in the first sound wave signal are 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, wherein 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 whose energy proportion is greater than the reference value belongs to the abnormal band, and the energy proportion 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, and the waveform change conforms to 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, 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;

[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 downward jump edge, the width of the downward jump edge is usually 50 points, and when the leakage occurs, the corresponding first sound wave signal has a continuous monotonous fast-decreasing small interval, and the width of the fast-decreasing small interval varies according to different 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 a number of second time intervals according to the width of 50 points, and each second time interval is differentiated, and 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 a number of 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 of 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] Embodiment 3, as attached Figure 3 As shown, the embodiment of the present invention discloses a pipe wall type acoustic wave monitoring and positioning method, which also 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 leakage has been determined to occur, wherein the time tag is the time when the collection point receives the first sound wave signal at the time when the leakage has been determined to occur;

[0085] Step S302, comparing the leakage occurrence time with the time label of each collection point, determining the two time labels with the smallest difference from the leakage occurrence time, and determining the two collection points corresponding to the two time labels;

[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 collection points.

[0087] In step S303, because the phases of the sound waves at different positions in space are different, the position of the leakage point can be determined according to 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 sonic wave monitoring and positioning method. By positioning the leakage point through the above method, the positioning accuracy can be improved, the staff can be convenient to quickly locate the leakage, and the safety hazards can be reduced.

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

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

[0091] Step S402, performing sliding average filtering on all first sound wave signals respectively 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 sound wave signal, performing differential filtering on the reference sound wave signal, obtaining a third sound wave signal, and extracting the sound wave characteristics of the third sound wave signal, wherein the reference sound wave signal is a sound wave signal generated when the pipeline is in a non-leaking state, and the sound wave characteristics 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, determining whether the acoustic wave characteristics of the third acoustic wave signal and the fourth acoustic wave signal are consistent, if so, the type of the fourth acoustic wave signal is a non-leakage signal, returning to step S404, searching for other second acoustic wave signals and performing differential filtering on them, obtaining the corresponding fourth acoustic wave signal, extracting the acoustic wave characteristics of the fourth acoustic wave signal, if not, the type of the fourth acoustic wave signal is a leakage signal, and entering step S406;

[0096] Step S406, searching and extracting all abnormal bands in the fourth sound wave signal determined as a leakage signal, wherein the method for searching and extracting abnormal bands in this embodiment is consistent with the method for searching and extracting abnormal bands in the above embodiment, and will not be repeated;

[0097] Step S407, calculating 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, wherein 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;

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

[0099] Step S409, judging whether the negative polarity region satisfies all preset judgment conditions, if so, judging that the leakage occurs in the negative polarity region, defining the negative polarity region as the first time interval, and entering step S410, if not, returning to step S408, looking 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 rear of the negative polarity region is not greater than the reference value;

[0100] Step S410, 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;

[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, 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;

[0103] Step S413, comparing the leakage occurrence time with the time label of each collection point, determining the two time labels with the smallest difference from the leakage occurrence time, and determining the two collection points corresponding to the two time labels;

[0104] Step S414, determining the location of the leakage point according to the phase difference generated when the first sound wave signal corresponding to the fourth sound wave signal at the time of leakage occurrence determined above reaches two collection points;

[0105] Step S415, issuing an alarm message, and returning to step S404, searching for other second sound wave signals and performing differential filtering on them, obtaining the corresponding fourth sound wave signal, extracting the sound wave feature of the fourth sound wave signal, until all the second sound wave information is traversed.

[0106] The embodiment of the present invention discloses a pipe wall type sound wave monitoring and positioning method, which obtains a second sound wave signal by filtering a first sound wave signal, obtains a fourth sound wave signal by filtering the second sound wave signal, and obtains a third sound wave signal by filtering a reference sound wave signal, thereby reducing noise interference and making leakage judgment more accurate. Moreover, judging whether a leakage occurs and locating the leakage point based on the third sound wave signal and the fourth sound wave signal can improve the accuracy of leakage judgment and leakage point positioning, thereby reducing losses and damages caused by leakage in a gas transportation pipeline.

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

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

[0109] A feature extraction module is configured to pre-set a reference sound wave signal and extract 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 not leaking, and the sound wave features include a differential value and a power spectrum;

[0110] A judging 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] Embodiment 6, as attached Figure 6 As shown, the embodiment of the present invention discloses a pipe wall type sound 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 calculates 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 when leakage occurs according to the abnormal band and energy proportion, 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] Embodiment 7, as attached Figure 7 As shown, the embodiment of the present invention discloses a pipe wall type sonic 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 the leakage has been determined to occur, wherein the time tag is the time when the collection point receives the first sound wave signal at the time when the leakage has been determined to occur;

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

[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] Embodiment 8, the 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 mentioned above 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 processor may be a central processing unit (CPU), a general purpose processor, a digital signal processor (DSP), an ASIC, an FPGA or other programmable logic device, a transistor logic device, a hardware component or any combination thereof. It may implement or execute various exemplary logic blocks, modules and circuits described in conjunction with the disclosure of this application. It may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a DSP and a microprocessor, and the like.

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

[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 reduced 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, extracting the 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 not leaking, 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; All first sound wave signals are traversed until all first sound wave signals determined to be leakage signals are found.

2. The pipe wall type sound wave monitoring and positioning method according to claim 1 is characterized in that: The method further includes processing all first sound wave signals determined to be leakage signals, and determining the leakage occurrence time according to the processing results, specifically including: Find and extract all abnormal bands of a first sound wave signal determined to be a leakage signal; Calculate 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; According to the abnormal band and energy proportion, a negative polarity area at the time of leakage is determined, and the negative polarity area is used as the first time interval; 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 taken as the leakage occurrence time.

3. The pipe wall type sound wave monitoring and positioning method according to claim 2 is characterized in that: According to the abnormal band and energy proportion, 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 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, 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.

4. The pipe wall type sound wave monitoring and positioning method according to claim 2 or 3, characterized in that: Splitting the first time interval into a plurality of second time intervals, and finding the second time interval with the largest difference value, and taking the starting point of the second time interval 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; 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.

5. The pipe wall type sound wave monitoring and positioning method according to claim 2 or 3, characterized in that: It also includes determining the location of the leakage point according to the leakage occurrence time after determining the leakage occurrence time, specifically including: Extracting the time tag of each collection point receiving a first sound wave signal at a time when the leakage has been determined to occur, wherein the time tag is the time when the collection point receives the first sound wave signal at the time when the leakage has been determined to occur; Compare the time when the leakage occurs with the time label of each collection point, determine the two time labels with the smallest difference from the time when the leakage occurs, and determine the two collection points corresponding to the two time labels; 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.

6. The pipe wall type sound wave monitoring and positioning method according to claim 4 is characterized in that: It also includes determining the location of the leakage point according to the leakage occurrence time after determining the leakage occurrence time, specifically including: Extracting the time tag of each collection point receiving a first sound wave signal at a time when the leakage has been determined to occur, wherein the time tag is the time when the collection point receives the first sound wave signal at the time when the leakage has been determined to occur; Compare the time when the leakage occurs with the time label of each collection point, determine the two time labels with the smallest difference from the time when the leakage occurs, and determine the two collection points corresponding to the two time labels; 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.

7. A pipe wall type sonic wave monitoring and positioning device applied to the method as claimed in any one of claims 1 to 6, characterized in that The invention comprises a leakage judgment unit, wherein the leakage judgment unit comprises: A receiving module receives a first sound wave signal from each collection point according to a plurality of collection points arranged at various positions on the oil and gas transportation pipeline; A feature extraction module is configured to pre-set a reference sound wave signal and extract 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 not leaking, and the sound wave features include a differential value and a power spectrum; A judging 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; The traversal module traverses all first sound wave signals until all first sound wave signals determined to be leakage signals are found.

8. The pipe wall type sonic wave monitoring and positioning device according to claim 7, characterized in that: The invention also includes a leakage time acquisition unit, which 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 calculates 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 when leakage occurs according to the abnormal band and energy proportion, 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.

9. The pipe wall type sonic wave monitoring and positioning device according to claim 7 or 8, 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 the leakage has been determined to occur, wherein the time tag is the time when the collection point receives the first sound wave signal at the time when the leakage has been determined to occur; The collection point positioning module compares the leakage occurrence time with the time label of each collection point, determines the two time labels with the smallest difference from the leakage occurrence time, and determines the two collection points corresponding to the above two time labels; 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.

10. An electronic device, characterized in that: It comprises 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 the pipe wall acoustic wave monitoring and positioning method as described in any one of claims 1 to 6.

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