CN105987284B - Pipeline leakage monitoring method and device - Google Patents
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Abstract
The invention provides a pipeline leakage monitoring method and a pipeline leakage monitoring device. The invention provides a pipeline leakage monitoring method, which comprises the following steps: collecting the flow and pressure at the head end and the tail end of the pipeline; when the flow curve at the head end or the tail end of the pipeline has an inflection point, judging whether the pressure curves at the head end and the tail end of the pipeline have the inflection point, and if the pressure curves at the head end and the tail end of the pipeline have the inflection point, recording a time difference value between first time when the pressure curve at the head end of the pipeline has the inflection point and second time when the pressure curve at the tail end of the pipeline has the inflection point; and determining the distance between the leakage point and the head end of the pipeline or the distance between the leakage point and the tail end of the pipeline according to the time difference and the propagation velocity of the liquid pressure wave in the pipeline. The invention can realize the accurate positioning of the leakage point on the pipeline by using the change of the flow at the two ends of the pipeline and the time difference of the inflection point of the pressure curve.
Description
Technical Field
The invention relates to a petroleum pipeline technology, in particular to a pipeline leakage monitoring method and a pipeline leakage monitoring device.
Background
When the collection and the transportation of oil or natural gas are carried out in the oil field, the transportation pipeline is long, and the management is difficult to depend on manpower. The natural damage or the artificial damage can cause the perforation or the fracture of the pipeline, if the timely treatment cannot be found in time, the production is influenced, a series of adverse effects such as a large amount of oil loss, environmental pollution and the like can be caused, and huge economic loss is caused. Therefore, it is necessary to monitor the oil and gas transmission pipeline for leakage.
At present, current oil field conveying line monitoring technology is provided with flowmeter or pressure sensor respectively at conveying line's both ends, and when the leakage phenomenon appeared on certain section pipeline between the conveying line both ends, flowmeter or pressure sensor at conveying line both ends detected the change of flow or pressure value, and sent out the alarm information that the pipeline leaked.
However, the current pipeline monitoring technology cannot know the accurate position of the leakage point on the pipeline.
Disclosure of Invention
The invention provides a method and a device for monitoring pipeline leakage, which comprehensively utilize the change of flow at two ends of a pipeline and the time difference of inflection points of a pressure curve to finish the accurate positioning of leakage points on the pipeline.
In a first aspect, the present invention provides a method for monitoring a pipeline leakage, comprising:
collecting the flow and pressure at the head end and the tail end of the pipeline; respectively carrying out filtering processing on the acquired flow and pressure to obtain a smooth flow curve for representing the change of the flow along with the time and a smooth pressure curve for representing the change of the pressure along with the time;
when the flow curve at the head end or the tail end of the pipeline has an inflection point, judging whether the pressure curves at the head end and the tail end of the pipeline have the inflection point, if the pressure curves at the head end and the tail end of the pipeline have the inflection point, recording first time when the pressure curve at the head end of the pipeline has the inflection point and second time when the pressure curve at the tail end of the pipeline has the inflection point, and determining a time difference value between the first time and the second time;
and determining the propagation speed of the liquid pressure wave in the pipeline, and determining the distance between the leakage point and the head end of the pipeline or the distance between the leakage point and the tail end of the pipeline according to the time difference and the propagation speed of the liquid pressure wave in the pipeline.
With reference to the first aspect, in a first implementation manner, the filtering the acquired flow to obtain a smooth flow curve specifically includes: and filtering the acquired flow by using a numerical analysis method to obtain a smooth flow curve.
With reference to the first aspect, in a second implementation manner, the filtering the acquired pressure to obtain a smooth pressure curve specifically includes: and filtering the acquired pressure by using a mean filtering algorithm and a digital first-order low-pass filtering algorithm to obtain a smooth pressure curve.
With reference to the first aspect and the first two embodiments, in a third embodiment, the determining whether the pressure curve has an inflection point before the inflection point further includes: the time synchronization signal is transmitted by using a User Datagram Protocol (UDP) protocol to synchronize the clock time of the head end and the tail end of the pipeline.
With reference to the first aspect and the first three embodiments, in a fourth embodiment, the determining a propagation velocity of a fluid pressure wave in a pipeline specifically includes:
according toDetermining the propagation velocity of the liquid pressure wave in the pipeline, wherein α is the propagation velocity of the liquid pressure wave in the pipeline, K is the bulk modulus of elasticity of the liquid in the pipeline, ρ is the density of the liquid in the pipeline, E is the modulus of elasticity of the material of the pipeline, D is the diameter of the pipeline, E is the pipe wall thickness of the pipeline, C1Is the correction factor of the pipeline.
With reference to the first aspect and the first three embodiments, in a fifth embodiment, after determining the distance between the leakage point and the head end/tail end of the pipeline according to the time difference and the propagation velocity of the pressure wave of the liquid in the pipeline, the method further includes: and determining the leakage amount of the leakage point according to the flow change value after the inflection point of the flow curve occurs.
In a second aspect, the present invention provides a pipe leakage monitoring device, comprising:
the acquisition module is used for acquiring the flow and pressure of the head end and the tail end of the pipeline;
the curve module is used for respectively carrying out filtering processing on the acquired flow and pressure to obtain a smooth flow curve for representing the change of the flow along with the time and a smooth pressure curve for representing the change of the pressure along with the time;
the time module is used for judging whether the pressure curves at the head end and the tail end of the pipeline have inflection points when the flow curve at the head end or the tail end of the pipeline has the inflection point, recording first time when the pressure curve at the head end of the pipeline has the inflection point and second time when the pressure curve at the tail end of the pipeline has the inflection point if the pressure curves at the head end and the tail end of the pipeline have the inflection points, and determining a time difference value between the first time and the second time;
and the position calculation module is used for determining the propagation speed of the liquid pressure wave in the pipeline and determining the distance between the leakage point and the head end/tail end of the pipeline according to the time difference and the propagation speed of the liquid pressure wave in the pipeline.
With reference to the second aspect, in a first embodiment, the curve module is specifically configured to: and filtering the acquired flow by using a numerical analysis method to obtain a smooth flow curve.
With reference to the second aspect, in a second embodiment, the curve module is specifically configured to: and filtering the acquired pressure by using a mean filtering algorithm and a digital first-order low-pass filtering algorithm to obtain a smooth pressure curve.
With reference to the second aspect and the first two embodiments, in a third embodiment, the time module is configured to determine whether the pressure curve has an inflection point ahead, and further configured to: the time synchronization signal is transmitted by using a User Datagram Protocol (UDP) protocol to synchronize the clock time of the head end and the tail end of the pipeline.
With reference to the second aspect and the first two embodiments, in a fourth embodiment, the position calculating module is specifically configured to:
according toDetermining the propagation velocity of the liquid pressure wave in the pipeline, wherein α is the propagation velocity of the liquid pressure wave in the pipeline, K is the bulk modulus of elasticity of the liquid in the pipeline, ρ is the density of the liquid in the pipeline, E is the modulus of elasticity of the material of the pipeline, D is the diameter of the pipeline, E is the pipe wall thickness of the pipeline, C1Is the correction factor of the pipeline.
With reference to the second aspect and the first two embodiments, in a fifth embodiment, the position calculating module, after determining the distance between the leakage point and the head/tail end of the pipeline according to the time difference and the propagation velocity of the pressure wave of the liquid in the pipeline, is further configured to: and determining the leakage amount of the leakage point according to the flow change value after the inflection point of the flow curve occurs.
The invention relates to a pipeline leakage monitoring method and a device, which comprises the steps of firstly collecting the flow and the pressure at the head end and the tail end of a pipeline, and then respectively carrying out filtering processing on the collected flow and pressure to obtain a smooth flow curve for representing the change of the flow along with the time and a smooth pressure curve for representing the change of the pressure along with the time; and when the flow curve at the head end or the tail end of the pipeline has an inflection point, judging whether the pressure curve at the head end or the tail end of the pipeline has the inflection point, if the pressure curve at the head end or the tail end of the pipeline has the inflection point, recording the first time when the pressure curve at the head end of the pipeline has the inflection point and the second time when the pressure curve at the tail end of the pipeline has the inflection point, determining the time difference between the first time and the second time, finally determining the propagation speed of the liquid pressure wave in the pipeline, and determining the distance between the leakage point and the head end/tail end of the pipeline according to the time difference and the propagation speed of the liquid pressure. Therefore, on the basis of obtaining the change of the pipeline flow, the time difference of the liquid pressure wave of the pipeline reaching the two ends of the pipeline is judged according to the inflection point of the pressure curve at the head end and the tail end of the pipeline, the distance between the leakage point and the head end or the tail end of the pipeline is further judged, and the accurate positioning of the leakage point of the pipeline is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic flow chart of a pipeline leakage monitoring method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a pipeline leakage model provided by an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a pipeline leakage monitoring device according to a second embodiment of the present invention;
fig. 4 is a schematic structural diagram of a pipeline leakage monitoring device according to a third embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic flow chart of a pipeline leakage monitoring method according to an embodiment of the present invention. As shown in fig. 1, the method for monitoring pipeline leakage according to the present embodiment includes:
s101, collecting the flow and pressure at the head end and the tail end of the pipeline.
Specifically, the oil gas conveying pipeline can be divided into a plurality of sections according to the pipeline interface of the oil gas conveying pipeline, and sensors are arranged at the head end and the tail end of each section of pipeline to collect flow data and pressure value data of the head end and the tail end. When data acquisition is carried out, various sensors in the prior art can be adopted for acquisition, for example, a flowmeter can be adopted for acquiring the liquid flow at the head end and the tail end of a pipeline, and a pressure sensor is utilized for acquiring pressure value data.
S102, filtering the collected flow and pressure respectively to obtain a smooth flow curve for representing the change of the flow along with the time and a smooth pressure curve for representing the change of the pressure along with the time.
After the flow and pressure values at the head end and the tail end of a section of conveying pipeline are collected, because the collected pressure and flow are discrete values, the discrete pressure and flow at different sampling times need to be connected to form a relatively smooth curve for representing the change of the pressure or the flow along with the time to analyze.
When the flow of a pipeline is collected, even if a high-precision dual-rotor flowmeter is used, under the condition that the input flow is stable, although the measurement precision of the accumulated flow is high, the rotation is still uneven, namely the instantaneous flow is still fluctuated, and the actual characteristics of each flowmeter of the same type are different. Therefore, when data acquisition is carried out, if the sampling period is too small, the fluctuation of instantaneous flow is too large, and the occurrence moment of leakage cannot be accurately judged.
In order to ensure that the acquired flow curve is smooth and a clear inflection point can be formed at the leakage occurrence position, the acquired flow can be filtered by using a numerical analysis method to obtain a smooth flow curve. Specifically, the instantaneous flow can be predicted by a computer software numerical statistic simulation means, and the average value of the current instantaneous flow is calculated according to an average value method, so that a discrete flow value which is too far away from the current instantaneous flow average value is filtered, and a smooth flow curve is finally obtained.
When the pressure at the head end and the tail end of the pipeline is collected, the collected pressure can be filtered by using a mean filtering algorithm and a digital first-order low-pass filtering algorithm to obtain a smooth pressure curve. Firstly, the pressure parameter which changes periodically can be filtered by utilizing a mean value filtering algorithm to obtain a smooth pressure curve, and for the condition that the pressure has more random interference, a digital first-order low-pass filtering algorithm can be adopted. Specifically, the digital first-order low-pass filtering algorithm is as follows:
Yn＝a×Xn+(1-a)×Yn-1
in the above formula:
Xnthe sampling value is the sampling value of the pipeline pressure;
Yn-1the last filtering output value of the pipeline pressure is obtained;
a is a filter coefficient, and the value of A is generally specified to be far less than 1;
Ynis a tubeThe output value of the road pressure after the filtering is carried out.
After the calculation of the digital first-order low-pass filtering algorithm, the random interference in the pressure can be eliminated, and simultaneously, the hardware cost of the RC low-pass filter can be reduced.
After the filtering step, the pressure collected from the head end and the tail end of the pipeline can be filtered to obtain a smoother pressure curve.
Through the steps, the flow curve and the pressure curve of the head end and the tail end of the pipeline can be obtained respectively, and the curves can be displayed through the display equipment, so that monitoring personnel can visually know the flow and pressure conditions of the two ends of the pipeline.
S103, when the flow curve at the head end or the tail end of the pipeline has an inflection point, judging whether the pressure curve at the head end and the tail end of the pipeline has the inflection point, if the pressure curve at the head end and the pressure curve at the tail end of the pipeline both have the inflection point, recording first time when the pressure curve at the head end of the pipeline has the inflection point and second time when the pressure curve at the tail end of the pipeline has the inflection point, and determining a time difference value between the first time and the second time.
Because this step requires the determination of the time value of the inflection point of the pressure curve, the clock times at the beginning and end of the pipe need to be synchronized before determining whether the pressure curve has an inflection point. Specifically, the time synchronization may be implemented in a hardware manner or a software manner.
When adopting the hardware mode to realize time synchronization, can use Global positioning system (Global positioning system, GPS for short) all time synchronization to be the Beijing time, need add GPS satellite positioning module like this on the head end of pipeline and terminal sensor, the GPS module positioning accuracy that uses serial port mode can reach the time synchronization precision and be less than 10ms, when using parallel port mode module, the precision can reach within 1ms, consider the expansibility of system in industrial control system, mainly use serial port mode GPS to carry out time synchronization. However, the GPS time synchronization method requires an external antenna to capture at least 3 GPS time synchronization satellites, so the architecture of the whole monitoring system becomes complicated, and factors such as the laying of an antenna cable and the lightning protection of the antenna need to be considered, which increases the workload of system maintenance.
When the time synchronization is performed in a software manner, the time synchronization is generally performed in a network time service manner, and specifically, a User data packet Protocol (UDP) may be used to transmit a time synchronization signal, so as to compare the time of the head end and the tail end of the pipeline with the reference time, respectively, so as to correct the time difference. The advantages of transmitting the time synchronization signal using the UDP protocol are as follows: under the condition of bad network, after the time synchronization packet is sent out, the acknowledgement packet can not be received, the failure can be directly acknowledged, complex acknowledgement retransmission is not needed, the packet head of the UDP protocol is 8 bytes, and the occupied bandwidth is narrow. Therefore, after the UDP protocol is used, the reliability of the transmission time synchronization signal is higher, and the time stability of the whole system is greatly improved.
After time synchronization, the time value of the inflection point of the pressure curve can be obtained. Specifically, in a pipeline with large pressure fluctuation or small pressure (0.2-0.3 MPa), because the generated negative pressure wave is very small, the energy transmitted to the detector is very low, and the negative pressure wave is often submerged and cannot be distinguished, a flow curve is judged firstly to judge whether a leakage condition occurs or not. Because the sum of the input quantities of the closed pipelines is equal to the sum of the output quantities of the pipelines, when the flow curve at the head end or the tail end of the pipeline has an inflection point, the change of the flow between the two ends of the pipeline can be judged, namely leakage occurs. At this time, whether the pressure curves at the head end and the tail end of the pipeline have inflection points needs to be judged, and if the pressure curves at the head end and the tail end of the pipeline both have the inflection points, the first time when the pressure curve at the head end of the pipeline has the inflection points and the second time when the pressure curve at the tail end of the pipeline has the inflection points are recorded.
Specifically, when the leakage condition appears between pipeline head end and the end, because the pressure of leakage point can reduce suddenly, the negative pressure wave that produces simultaneously will propagate to both ends along the pipeline to lead to the pressure value that pipeline head end and pipeline end were monitored all can certain decline suddenly to appear, and the pressure curve of pipeline head end also can reduce suddenly thereupon with the pressure curve of pipeline end, and change from the horizontality and present a section comparatively precipitous decline state. Because the instantaneous propagation speed of the negative pressure wave in the pipe is a function of the values of medium viscosity, density, pipe diameter, elastic modulus and the like. Thus, the time during which the pressure drop is monitored at the two ends of the pipe varies with the location of the leak. At this time, the time of the pressure curves at the head end and the tail end of the pipeline at the inflection point from the horizontal state to the descending state is the time when the pressure at the two ends of the pipeline is monitored to be reduced, the time is respectively recorded as a first time and a second time, and the time difference between the first time and the second time is determined.
Fig. 2 is a schematic diagram of a pipeline leakage model according to an embodiment of the present invention. Taking the pipeline leakage model shown in fig. 2 as an example, head end pressure measuring points p are respectively arranged at the upstream end and the downstream end of the pipeline1And a terminal pressure measurement point p2Head end pressure measurement point p1The collected pressure data forms a pressure curve at the head end of the pipeline, and a pressure measuring point p at the tail end2When leakage occurs at the X position of the pipeline, negative pressure waves generated by the leakage propagate to the head end and the tail end of the pipeline at a certain speed α respectively and are transmitted at t and t + tau0Time of day is sensed by sensor p1、p2And (4) detecting. Thus, the time at the inflection point of the pressure curve at the head end of the pipeline is t, while the time at the inflection point of the pressure curve at the tail end of the pipeline is t + τ0。
S104, determining the propagation velocity of the liquid pressure wave in the pipeline, and determining the distance between the leakage point and the head end/tail end of the pipeline according to the time difference and the propagation velocity of the liquid pressure wave in the pipeline.
Also taking the pipeline leakage model in fig. 2 as an example, let the length between the head end and the tail end of the pipeline be L, and X be the distance from the leakage point in the pipeline to the head end of the pipeline, so the distance from the leakage point to the tail end of the pipeline is L-X.
The following relationships can be obtained:
solving the positioning formula according to the above formula is as follows:
wherein X is the distance between the leakage point and the head end of the pipeline;
l is the distance (pipe length) between the head end of the pipeline and the tail end of the pipeline;
α is the propagation velocity of the liquid pressure wave in the pipeline;
τ0the time difference of the inflection point is generated for the pressure curve at the head end and the tail end of the pipeline.
Therefore, the distance between the leakage point and the head end of the pipeline or the distance between the leakage point and the tail end of the pipeline can be calculated through the time difference of the inflection points of the pressure curves at the head end and the tail end of the pipeline and the propagation speed of the liquid pressure wave in the pipeline.
Specifically, the propagation velocity of the hydraulic pressure wave in the pipeline is determined according to the condition of the liquid in the pipeline and the shape and size of the pipeline, so when determining the propagation velocity of the hydraulic pressure wave in the pipeline, the propagation velocity of the hydraulic pressure wave in the pipeline can be determined according to the following formula:
wherein,
α is the propagation velocity of the liquid pressure wave in the pipeline;
k is the volume elastic coefficient of the liquid in the pipeline;
rho is the density of the liquid in the pipeline;
e is the modulus of elasticity of the material of the pipe;
d is the diameter of the pipeline;
e is the pipe wall thickness of the pipeline;
C1is the correction factor of the pipeline.
After the propagation velocity of the liquid pressure wave in the pipeline is obtained according to the formula, the distance between the leakage point and the head end/tail end of the pipeline can be determined by combining the time difference.
Optionally, after the distance between the leakage point and the head end/tail end of the acquisition pipeline is determined according to the time difference and the propagation speed of the liquid pressure wave in the pipeline, the leakage amount of the leakage point can be determined according to the flow change value after the inflection point appears on the flow curve. Specifically, the flow curve after the inflection point time may be integrated to obtain the flow variation value after the inflection point.
In this embodiment, first, the flow and pressure at the head end and the tail end of the pipeline are collected, and then the collected flow and pressure are filtered respectively to obtain a smooth flow curve for representing the change of the flow with time and a smooth pressure curve for representing the change of the pressure with time; and when the flow curve at the head end or the tail end of the pipeline has an inflection point, judging whether the pressure curve at the head end or the tail end of the pipeline has the inflection point, if the pressure curve at the head end or the tail end of the pipeline has the inflection point, recording the first time when the pressure curve at the head end of the pipeline has the inflection point and the second time when the pressure curve at the tail end of the pipeline has the inflection point, determining the time difference between the first time and the second time, finally determining the propagation speed of the liquid pressure wave in the pipeline, and determining the distance between the leakage point and the head end/tail end of the pipeline according to the time difference and the propagation speed of the liquid pressure. Therefore, on the basis of obtaining the change of the pipeline flow, the time difference of the liquid pressure wave of the pipeline reaching the two ends of the pipeline is judged according to the inflection point of the pressure curve at the head end and the tail end of the pipeline, the distance between the leakage point and the head end or the tail end of the pipeline is further judged, and the accurate positioning of the leakage point of the pipeline is realized.
Fig. 3 is a schematic structural diagram of a pipeline leakage monitoring device according to a second embodiment of the present invention. As shown in fig. 3, the present embodiment provides a pipe leakage monitoring apparatus 31 including:
the acquisition module 301 is used for acquiring the flow and pressure at the head end and the tail end of the pipeline;
a curve module 302, configured to perform filtering processing on the collected flow and pressure respectively to obtain a smooth flow curve for representing a change of the flow with time and a smooth pressure curve for representing a change of the pressure with time;
the time module 303 is configured to determine whether there is an inflection point in the pressure curves at the head end and the tail end of the pipeline when the flow curve at the head end or the tail end of the pipeline has the inflection point, record a first time when the pressure curve at the head end of the pipeline has the inflection point and a second time when the pressure curve at the tail end of the pipeline has the inflection point if both the pressure curves at the head end and the tail end of the pipeline have the inflection point, and determine a time difference between the first time and the second time;
and the position calculation module 304 is used for determining the propagation velocity of the liquid pressure wave in the pipeline and determining the distance between the leakage point and the head end/tail end of the pipeline according to the time difference and the propagation velocity of the liquid pressure wave in the pipeline.
Specifically, the curve module 302 is specifically configured to perform filtering processing on the acquired flow by using a numerical analysis method to obtain a smooth flow curve.
Specifically, the curve module 302 is further configured to perform filtering processing on the collected pressure by using a mean filtering algorithm and a digital first-order low-pass filtering algorithm to obtain a smooth pressure curve.
Specifically, the time module 303 is configured to determine whether the pressure curve has a point before the inflection point, and further configured to transmit a time synchronization signal using a user datagram protocol UDP protocol, so as to synchronize clock times at the head end and the tail end of the pipeline.
Specifically, the position calculating module 304 is specifically configured to: according to
Determining the propagation velocity of the liquid pressure wave in the pipeline, wherein α is the propagation velocity of the liquid pressure wave in the pipeline, K is the bulk modulus of elasticity of the liquid in the pipeline, ρ is the density of the liquid in the pipeline, E is the modulus of elasticity of the material of the pipeline, D is the diameter of the pipeline, E is the pipe wall thickness of the pipeline, C1Is the correction factor of the pipeline.
Specifically, the position calculating module 304 is further configured to determine the leakage amount of the leakage point according to the flow rate variation value after the inflection point appears on the flow rate curve after the distance between the leakage point and the head end/tail end of the pipeline is determined according to the time difference value and the propagation velocity of the fluid pressure wave in the pipeline.
The device for monitoring pipeline leakage provided in this embodiment may perform the specific steps of the method for monitoring pipeline leakage in the first embodiment, which are not described herein again.
In this embodiment, the acquisition module of the pipeline leakage monitoring device is used for acquiring the flow and pressure at the head end and the tail end of the pipeline; the curve module is used for respectively filtering the acquired flow and pressure to obtain a smooth flow curve and a smooth pressure curve; the time module is used for judging whether the pressure curves at the head end and the tail end of the pipeline have inflection points when the flow curve at the head end or the tail end of the pipeline has the inflection points, if the pressure curves at the head end and the tail end of the pipeline have the inflection points, recording first time when the pressure curve at the head end of the pipeline has the inflection points and second time when the pressure curve at the tail end of the pipeline has the inflection points, and determining a time difference value between the first time and the second time; and the position calculation module is used for determining the propagation speed of the liquid pressure wave in the pipeline and determining the distance between the leakage point and the head end/tail end of the pipeline according to the time difference and the propagation speed of the liquid pressure wave in the pipeline. Therefore, on the basis of obtaining the change of the pipeline flow, the time difference of the liquid pressure wave of the pipeline reaching the two ends of the pipeline is judged according to the inflection point of the pressure curve at the head end and the tail end of the pipeline, the distance between the leakage point and the head end or the tail end of the pipeline is further judged, and the accurate positioning of the leakage point of the pipeline is realized.
Fig. 4 is a schematic structural diagram of a pipeline leakage monitoring device according to a third embodiment of the present invention. As shown in fig. 4, the present embodiment provides a pipe leakage monitoring apparatus 41 including:
a sensor 401 for collecting the flow and pressure at the head end and the tail end of the pipeline;
a processor 402, configured to perform filtering processing on the acquired flow and pressure respectively to obtain a smooth flow curve representing a change of the flow with time and a smooth pressure curve representing a diagnosis of the pressure with time;
when the flow curve at the head end or the tail end of the pipeline has an inflection point, judging whether the pressure curves at the head end and the tail end of the pipeline have the inflection point, if the pressure curves at the head end and the tail end of the pipeline have the inflection point, recording first time when the pressure curve at the head end of the pipeline has the inflection point and second time when the pressure curve at the tail end of the pipeline has the inflection point, and determining a time difference value between the first time and the second time;
and determining the propagation speed of the liquid pressure wave in the pipeline, and determining the distance between the leakage point and the head end/tail end of the pipeline according to the time difference and the propagation speed of the liquid pressure wave in the pipeline.
Specifically, the processor 402 is specifically configured to perform filtering processing on the acquired flow by using a numerical analysis method to obtain a smooth flow curve.
Specifically, the processor 402 is further configured to perform filtering processing on the acquired pressure by using a mean filtering algorithm and a digital first-order low-pass filtering algorithm to obtain a smooth pressure curve.
Specifically, the processor 402 is further configured to determine whether the pressure curve has a point before the inflection point, and further configured to transmit a time synchronization signal using a user datagram protocol UDP protocol to synchronize clock times at the head end and the tail end of the pipe.
In particular, the processor 402 is also configured to operate in accordance with
Determining the propagation velocity of the liquid pressure wave in the pipeline, wherein α is the propagation velocity of the liquid pressure wave in the pipeline, K is the bulk modulus of elasticity of the liquid in the pipeline, ρ is the density of the liquid in the pipeline, E is the modulus of elasticity of the material of the pipeline, D is the diameter of the pipeline, E is the pipe wall thickness of the pipeline, C1Is the correction factor of the pipeline.
Specifically, the processor 402 is further configured to determine the leakage amount of the leakage point according to the flow rate variation value after the inflection point appears on the flow rate curve after determining the distance between the leakage point and the head end/tail end of the pipeline according to the time difference value and the propagation velocity of the fluid pressure wave in the pipeline.
In this embodiment, the sensor in the pipeline leakage monitoring device is used for acquiring the flow and pressure at the head end and the tail end of the pipeline; the processor is used for respectively carrying out filtering processing on the acquired flow and pressure to obtain a smooth flow curve and a smooth pressure curve; when the flow curve at the head end or the tail end of the pipeline has an inflection point, judging whether the pressure curves at the head end and the tail end of the pipeline have the inflection point, if the pressure curves at the head end and the tail end of the pipeline have the inflection point, recording first time when the pressure curve at the head end of the pipeline has the inflection point and second time when the pressure curve at the tail end of the pipeline has the inflection point, and determining a time difference value between the first time and the second time; and determining the propagation speed of the liquid pressure wave in the pipeline, and determining the distance between the leakage point and the head end/tail end of the pipeline according to the time difference and the propagation speed of the liquid pressure wave in the pipeline. Therefore, on the basis of obtaining the change of the pipeline flow, the time difference of the pipeline pressure wave reaching the two ends of the pipeline is judged according to the inflection point of the pressure curve at the head end and the tail end of the pipeline, and the distance between the leakage point and the head end or the tail end of the pipeline is further judged, so that the accurate positioning of the leakage point of the pipeline is realized.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. A method of monitoring for pipeline leaks, comprising:
collecting the flow and pressure at the head end and the tail end of the pipeline;
respectively carrying out filtering processing on the acquired flow and the acquired pressure to obtain a smooth flow curve for representing the change of the flow along with the time and a smooth pressure curve for representing the change of the pressure along with the time;
when the flow curve at the head end or the tail end of the pipeline has an inflection point, judging whether the pressure curves at the head end and the tail end of the pipeline have the inflection point, if the pressure curves at the head end and the tail end of the pipeline have the inflection point, recording first time when the pressure curve at the head end of the pipeline has the inflection point and second time when the pressure curve at the tail end of the pipeline has the inflection point, and determining a time difference value between the first time and the second time;
determining the propagation velocity of the liquid pressure wave in the pipeline, and determining the distance between the leakage point and the head end of the pipeline or the distance between the leakage point and the tail end of the pipeline according to the time difference and the propagation velocity of the liquid pressure wave in the pipeline;
the filtering the acquired flow to obtain a smooth flow curve specifically includes:
filtering the collected flow by using a numerical analysis method to obtain a smooth flow curve;
the filtering the collected pressure to obtain a smooth pressure curve specifically includes:
and filtering the collected pressure by using a mean filtering algorithm and a digital first-order low-pass filtering algorithm to obtain a smooth pressure curve.
2. The method of claim 1, wherein the determining whether the pressure curve has an inflection point before the inflection point further comprises:
and transmitting a time synchronization signal by using a user data packet protocol (UDP) protocol to synchronize the clock time of the head end and the tail end of the pipeline.
3. The method for monitoring the leakage of the pipeline according to claim 1, wherein the determining the propagation velocity of the fluid pressure wave in the pipeline specifically comprises:
according toDetermining the propagation velocity of the liquid pressure wave in the pipeline, wherein α is the propagation velocity of the liquid pressure wave in the pipeline, and K is the velocityThe volume elastic coefficient of the liquid in the pipeline, rho is the density of the liquid in the pipeline, E is the elastic modulus of the material of the pipeline, D is the diameter of the pipeline, E is the pipe wall thickness of the pipeline, C1Is the correction factor of the pipeline.
4. The method for monitoring pipeline leakage according to claim 1, wherein after determining the distance between the leakage point and the head end/tail end of the pipeline according to the time difference and the propagation velocity of the pressure wave of the liquid in the pipeline, the method further comprises:
and determining the leakage amount of the leakage point according to the flow change value of the flow curve after the inflection point appears.
5. A pipeline leak monitoring device, comprising:
the acquisition module is used for acquiring the flow and pressure of the head end and the tail end of the pipeline;
the curve module is used for respectively filtering the acquired flow and the acquired pressure to obtain a smooth flow curve for representing the change of the flow along with the time and a smooth pressure curve for representing the change of the pressure along with the time;
the time module is used for judging whether the pressure curves at the head end and the tail end of the pipeline have inflection points when the flow curves at the head end or the tail end of the pipeline have the inflection points, recording first time when the pressure curve at the head end of the pipeline has the inflection points and second time when the pressure curve at the tail end of the pipeline has the inflection points if the pressure curves at the head end and the tail end of the pipeline have the inflection points, and determining a time difference value between the first time and the second time;
the position calculation module is used for determining the propagation velocity of the liquid pressure wave in the pipeline and determining the distance between the leakage point and the head end/tail end of the pipeline according to the time difference and the propagation velocity of the liquid pressure wave in the pipeline;
the curve module is specifically configured to:
filtering the collected flow by using a numerical analysis method to obtain a smooth flow curve;
the curve module is specifically configured to:
and filtering the collected pressure by using a mean filtering algorithm and a digital first-order low-pass filtering algorithm to obtain a smooth pressure curve.
6. The pipe leakage monitoring device of claim 5, wherein the time module is configured to determine whether the pressure curve is ahead of an inflection point, and further configured to:
and transmitting a time synchronization signal by using a user data packet protocol (UDP) protocol to synchronize the clock time of the head end and the tail end of the pipeline.
7. The pipeline leakage monitoring device of claim 5, wherein the position calculation module is specifically configured to:
according toDetermining the propagation velocity of the liquid pressure wave in the pipeline, wherein α is the propagation velocity of the liquid pressure wave in the pipeline, K is the bulk modulus of elasticity of the liquid in the pipeline, ρ is the density of the liquid in the pipeline, E is the modulus of elasticity of the material of the pipeline, D is the diameter of the pipeline, E is the pipe wall thickness of the pipeline, C1Is the correction factor of the pipeline.
8. The pipe leakage monitoring device of claim 5, wherein the position calculation module, after determining the distance between the leakage point and the head/tail end of the pipe according to the time difference and the propagation velocity of the pressure wave of the liquid in the pipe, is further configured to:
and determining the leakage amount of the leakage point according to the flow change value of the flow curve after the inflection point appears.
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Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106499957B (en) * | 2016-12-28 | 2018-11-02 | 沈阳工业大学 | A kind of pressure wave signal generator and in-pipeline detector real-time tracking localization method |
| JP6757696B2 (en) * | 2017-04-21 | 2020-09-23 | 株式会社荏原製作所 | A computer-readable recording medium that records a leak inspection method and a program for executing this leak inspection method. |
| CN107084313A (en) * | 2017-05-16 | 2017-08-22 | 云南大红山管道有限公司 | Ore slurry pipeline leaks positioning alarm system and method |
| CN109307158B (en) * | 2017-07-28 | 2020-07-10 | 中国石油天然气股份有限公司 | Method and device for determining pipeline leakage |
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| CN108662442B (en) * | 2018-08-23 | 2019-08-06 | 辽宁石油化工大学 | Method and device for locating pipeline leakage |
| CN111365623B (en) * | 2020-03-09 | 2021-01-19 | 大连理工大学 | Negative pressure wave inflection point identification method based on linear fitting |
| CN111609324B (en) * | 2020-05-29 | 2021-02-19 | 北京化工大学 | Pipeline leakage detection method and device |
| CN113357548B (en) * | 2021-06-02 | 2022-10-21 | 江南造船(集团)有限责任公司 | Method for detecting leakage of outer pipe of double-wall pipe in cabin |
| CN113654899B (en) * | 2021-07-30 | 2023-12-22 | 深圳市中金岭南有色金属股份有限公司凡口铅锌矿 | Pressure analysis method, device, equipment and storage medium for conveying pipeline |
| CN114025251B (en) * | 2021-11-03 | 2024-07-23 | 国家石油天然气管网集团有限公司华南分公司 | An instrument abnormality alarm method, device and medium |
| CN114117695B (en) * | 2021-11-10 | 2025-03-18 | 浙江能源天然气集团有限公司 | A method for quickly predicting the cumulative flow of natural gas pipeline network |
| CN113836680B (en) * | 2021-11-25 | 2022-03-08 | 德仕能源科技集团股份有限公司 | Automatic filling method and technology for petroleum oil pipe |
| CN114017685A (en) * | 2021-11-26 | 2022-02-08 | 国家石油天然气管网集团有限公司华南分公司 | Method, device and medium for detecting leakage of refined oil pipeline |
| CN115451347B (en) * | 2022-08-05 | 2023-04-28 | 国家管网集团北方管道有限责任公司 | An intelligent monitoring system and method for oil pipeline safety |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1273342A (en) * | 1999-05-10 | 2000-11-15 | 河北省河间市飞尔达自动化仪表有限公司 | Method and device for monitoring and locating leakage of fluid delivering pipeline |
| CN201416750Y (en) * | 2009-04-17 | 2010-03-03 | 张甫仁 | Gas pipeline network leakage location and alarm system |
| CN102563362A (en) * | 2011-12-31 | 2012-07-11 | 杭州哲达科技股份有限公司 | Compressed air system and intelligent pipe network leakage detecting method for same |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103822097B (en) * | 2012-11-16 | 2016-11-16 | 国际商业机器公司 | The method and device of the velocity of wave of suction wave is estimated in fluid-transporting tubing |
-
2015
- 2015-01-27 CN CN201510041235.XA patent/CN105987284B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1273342A (en) * | 1999-05-10 | 2000-11-15 | 河北省河间市飞尔达自动化仪表有限公司 | Method and device for monitoring and locating leakage of fluid delivering pipeline |
| CN201416750Y (en) * | 2009-04-17 | 2010-03-03 | 张甫仁 | Gas pipeline network leakage location and alarm system |
| CN102563362A (en) * | 2011-12-31 | 2012-07-11 | 杭州哲达科技股份有限公司 | Compressed air system and intelligent pipe network leakage detecting method for same |
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