CN109780447B - Method for detecting blockage condition in pressure pipeline by using pulse pressure wave - Google Patents
Method for detecting blockage condition in pressure pipeline by using pulse pressure wave Download PDFInfo
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- CN109780447B CN109780447B CN201811627188.7A CN201811627188A CN109780447B CN 109780447 B CN109780447 B CN 109780447B CN 201811627188 A CN201811627188 A CN 201811627188A CN 109780447 B CN109780447 B CN 109780447B
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- 230000035485 pulse pressure Effects 0.000 title claims abstract description 88
- 238000000034 method Methods 0.000 title claims abstract description 32
- 230000000903 blocking effect Effects 0.000 claims abstract description 34
- 230000035772 mutation Effects 0.000 claims description 9
- 230000035939 shock Effects 0.000 claims description 7
- 239000004576 sand Substances 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 10
- 238000004458 analytical method Methods 0.000 abstract description 5
- 239000007789 gas Substances 0.000 description 5
- 241000282414 Homo sapiens Species 0.000 description 2
- 230000005251 gamma ray Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- NMJORVOYSJLJGU-UHFFFAOYSA-N methane clathrate Chemical compound C.C.C.C.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O NMJORVOYSJLJGU-UHFFFAOYSA-N 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
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Abstract
A method for detecting the blocking condition in a pressure pipeline by using pulse pressure waves belongs to the technical field of pipeline detection. The method comprises the following steps: 1, transmitting a section of pulse pressure wave at an inlet of a pressure pipeline by using an electromagnetic valve; 2, arranging a high-frequency dynamic pressure sensor A at the inlet of the pressure pipeline, recording a pulse pressure wave signal S1, arranging a high-frequency dynamic pressure sensor B at a position L away from the inlet of the pressure pipeline, and recording a pulse pressure wave signal S2; 3 analyzing S1 and S2 to obtain the propagation speed C and the attenuation coefficient eta of the pulse pressure wave; 4 analysis S2 to obtain the clogging condition. The invention actively transmits a section of pulse pressure wave in the pipeline by rapidly opening and closing the electromagnetic valve, analyzes effective information in incident wave and reflected wave, can accurately judge the number and type of the blocked sections, can obtain the blocking position, the blocking rate and the blocking length, and has simple and convenient operation and high precision.
Description
Technical Field
The invention relates to the technical field of pipeline detection, in particular to a method for detecting the blockage condition in a pressure pipeline by using pulse pressure waves.
Background
Along with the gradual depletion of global fossil energy and the deepening of development and utilization of oil and gas resources by human beings, the development of the oil and gas resources by human beings is gradually shifted from land to sea, so that the mileage of submarine pipelines is continuously increased as the most main oil and gas conveying mode, the running condition of the submarine pipelines is directly related to the safety of offshore oil and gas fields in the development of marine oil and gas, and the pipelines can be blocked due to various reasons such as the accumulation of paraffin, asphalt and other solids and the generation of natural gas hydrate solids in the running process;
after the pipeline is blocked, the detection of the blocking position and the blocking degree is rapidly realized, and the blocking is timely removed to reduce the economic loss caused by the blocking, so that the demand of oil companies is more and more urgent; the existing common pipeline blockage detection methods include methods such as sound wave detection, gamma ray detection, pressure signal analysis and the like, the operation method of the sound wave detection is to arrange acoustic sensors in pairs in a monitoring area to form an array, when the pipeline is blocked, pressure fluctuation can be caused by the change of the cross section area of a flow channel, so that sound waves are generated, the sensors on two sides of the blocked area receive signals to analyze, and the blocked position is determined, but the method is easily interfered by background noise, and the positioning precision and accuracy are influenced; the gamma ray method is to position the blockage position by utilizing the penetration characteristic of gamma rays, and the result is more accurate, but the method has the main limitations that when the submarine pipeline is blocked, the operation is more troublesome, and the cost is higher; the pressure signal analysis method is used for judging the blocking position and the blocking degree according to the characteristics that the pressure signal in the pipeline changes along with the pipeline and the event, and the method is simple to operate and poor in detection precision.
Disclosure of Invention
In order to solve the problems that the existing pipeline blockage detection method is easy to interfere, high in cost or poor in detection precision, the invention provides a method for detecting the blockage condition in a pressure pipeline by using pulse pressure waves.
In order to achieve the purpose, the invention adopts the technical scheme that: a method of detecting an occlusion condition in a pressure conduit using a pulsed pressure wave, comprising the steps of:
(1) a section of pulse pressure wave is emitted at the inlet of the pressure pipeline by using the electromagnetic valve;
(2) the method comprises the following steps that a high-frequency dynamic pressure sensor A is arranged at an inlet of the pressure pipeline, the high-frequency dynamic pressure sensor A records a pulse pressure wave signal S1 at the inlet of the pressure pipeline, a high-frequency dynamic pressure sensor B is arranged at a position L away from the inlet of the pressure pipeline, and the high-frequency dynamic pressure sensor B records a pulse pressure wave signal S2 at the position L away from the inlet of the pressure pipeline;
(3) analyzing the pulse pressure wave signal S1 and the pulse pressure wave signal S2 to obtain the pulse pressure wave propagation speed C and the pulse pressure wave attenuation coefficient eta;
(4) the pulse pressure wave signal S2 is analyzed to obtain an occlusion condition.
Further, the pulse pressure wave is a unimodal negative pressure wave, the width of the pulse pressure wave is less than 50ms, and the signal acquisition frequency of the high-frequency dynamic pressure sensor A and the signal acquisition frequency of the high-frequency dynamic pressure sensor B are higher than 10 khz.
Further, in the above-mentioned case,specifically, the analysis of the pulsed pressure wave signal S1 and the pulsed pressure wave signal S2 is to obtain a first incident wave of the pulsed pressure wave signal S1 as D1, and a first mutation point of the D1 is marked as a feature point 1, so that the time of the feature point 1 is T1The pressure fluctuation of D1 is most equal to P1(ii) a The first incident wave of the pulse pressure wave signal S2 is D2, the first mutation point of D2 is marked as a characteristic point 2, and the time of the characteristic point 2 is T2The pressure fluctuation of D2 is most equal to P2。
Further, the obtaining of the pulse pressure wave propagation speed C and the pulse pressure wave attenuation coefficient η is specifically to obtain the pulse pressure wave propagation speed C through a wave speed formula, and obtain the pulse pressure wave attenuation coefficient η through an attenuation coefficient definition calculation; the wave velocity formula is:
the attenuation coefficient is defined as:
further, the step (4) is specifically as follows:
when a reflected wave with a smaller pressure fluctuation value appears after the incident wave of S2, a blocked section appears in the pressure pipeline;
if the reflected wave is a single negative pulse pressure wave, the blockage condition is a short blockage section;
if the reflected wave is a single negative pulse pressure wave followed by a single positive pulse pressure wave, the blockage event is the occurrence of a long blockage segment.
Further, the method also comprises the step (5) of obtaining the blocking position x and the blocking rate S of the blocking section, and obtaining the length l of the blocking section when the blocking condition is that a long blocking section appears; at this time, the first negative pulse pressure wave generated by the blockage section is D3, the first abrupt change point of D3 is marked as a characteristic point 3, and the time of the characteristic point 3 is T3The pressure fluctuation of D3 is most equal to P3(ii) a When the blockage condition is that a long blockage section occurs, the first one isThe negative pulse pressure wave is followed by the first positive pulse pressure wave, the first positive pulse pressure wave is D4, the first mutation point of D4 is marked as a characteristic point 4, and the time of the characteristic point 4 is T4The pressure fluctuation of D4 is most equal to P4。
Further, the calculation formula of the blockage position is as follows:
the calculation formula of the length of the blockage section is as follows:
further, the calculation formula of the blockage rate is as follows:
wherein: k is the ratio of the pressure fluctuations of the reflected wave to the incident wave at the location of the blockage.
Further, the calculation formula of the pressure fluctuation maximum-to-minimum ratio of the reflected wave and the incident wave at the blockage position is as follows:
wherein XSAnd e is a natural constant, namely the stroke distance of the shock wave.
Further, the calculation formula of the stroke distance of the shock wave is as follows:
wherein: beta is a nonlinear coefficient, mu0T is the pulse pressure wave width and pi is the circumferential rate.
The invention has the beneficial effects that: the rapid on-off electromagnetic valve actively emits a section of pulse pressure wave in the pipeline, analyzes effective information in incident waves and reflected waves, can accurately judge the number and the type of the blocking sections, can obtain the blocking position, the blocking rate and the blocking length, and is simple and convenient to operate and high in precision.
Drawings
FIG. 1 is a schematic representation of a pressure wave plot of the present invention.
Detailed Description
A method of detecting a blockage in a pressure conduit using pulsed pressure waves, comprising the steps of:
(1) rapidly opening and closing an electromagnetic valve positioned at the inlet of the pipeline, and transmitting a section of pulse pressure wave into the pressure pipeline at the inlet of the pressure pipeline;
(2) the method comprises the following steps that a high-frequency dynamic pressure sensor A is arranged at an inlet of the pressure pipeline, the high-frequency dynamic pressure sensor A records a pulse pressure wave signal S1 at the inlet of the pressure pipeline, a high-frequency dynamic pressure sensor B is arranged at a position L away from the inlet of the pressure pipeline, and the high-frequency dynamic pressure sensor B records a pulse pressure wave signal S2 at the position L away from the inlet of the pressure pipeline; preferably, L is 50 m;
(3) establishing a pressure wave curve chart through the pulse pressure wave signal S1 and the pulse pressure wave signal S2, analyzing the pulse pressure wave signal S1 and the pulse pressure wave signal S2, and obtaining a pulse pressure wave propagation speed C and a pulse pressure wave attenuation coefficient eta;
(4) the pulse pressure wave signal S2 is analyzed to obtain an occlusion condition.
The pulse pressure wave is a single-peak negative pressure wave, the width of the pulse pressure wave is less than 50ms, and the signal acquisition frequency of the high-frequency dynamic pressure sensor A and the high-frequency dynamic pressure sensor B is higher than 10 khz.
Specifically, the analysis of the pulsed pressure wave signal S1 and the pulsed pressure wave signal S2 is that the first incident wave of the pulsed pressure wave signal S1 is D1, the first sudden change point of D1 (i.e., the inflection point where the dynamic pressure signal starts to suddenly change) is marked as a feature point 1, and the time of the feature point 1 is T1The pressure fluctuation of D1 is most equal to P1(ii) a The first incident wave of the pulse pressure wave signal S2 is D2, and the first mutation point of D2 is marked as specialThe feature point 2, the time of the feature point 2 is T2The pressure fluctuation of D2 is most equal to P2(ii) a The pressure wave curve graph can be more intuitive, and the working efficiency is improved.
The pulse pressure wave propagation speed C and the pulse pressure wave attenuation coefficient eta are obtained by calculating the pulse pressure wave propagation speed C through a wave speed formula and calculating the pulse pressure wave attenuation coefficient eta through attenuation coefficient definition; the wave velocity formula is:
the attenuation coefficient is defined as:
wherein: ln is a natural logarithmic sign.
The step (4) is specifically as follows:
when a reflected wave with a smaller pressure fluctuation value appears after the incident wave of S2, a blocked section appears in the pressure pipeline;
if the reflected wave is a single negative pulse pressure wave, the pipe diameter of a certain section of the pipeline is reduced, and the section is shorter in length, so that the blockage condition can be judged to be a short blockage section;
if the reflected wave is a single negative pulse pressure wave followed by a single positive pulse pressure wave, the pipe diameter of the pipeline at a certain section is reduced, and the pipe diameter is increased after a certain distance, and the blockage condition can be judged to be a long blockage section;
if the reflected wave includes a form of two or more combinations of the above two cases, it can be determined that the clogging state is also a form of two or more combinations of the above two cases.
The method also comprises the step (5) of obtaining the blocking position x and the blocking rate S of the blocking section, and obtaining the length l of the blocking section when the blocking condition is that a long blocking section appears; at this time, the first negative pulse pressure wave reflected wave generated by the blockage section is D3, the first mutation point of D3 is marked as a characteristic point 3, and the time of the characteristic point 3 is T3The pressure fluctuation of D3 is most equal to P3(ii) a When the blockage condition is a long blockage section, the first negative pulse pressure wave is followed by the first positive pulse pressure wave, the first positive pulse pressure wave is D4, the first mutation point of D4 is marked as a characteristic point 4, and the time of the characteristic point 4 is T4The pressure fluctuation of D4 is most equal to P4。
The calculation formula of the blocking position is as follows:
the calculation formula of the length of the blockage section is as follows:
the calculation formula of the blockage rate is as follows:
wherein: k is the ratio of the pressure fluctuations of the reflected wave to the incident wave at the location of the blockage.
The calculation formula of the pressure fluctuation maximum-to-minimum ratio of the reflected wave to the incident wave at the blockage position is as follows:
wherein XSAnd e is a natural constant, namely the stroke distance of the shock wave.
The impulse pressure wave forms shock wave in the process of propagation, and the stroke distance of the shock wave is calculated by the following formula:
wherein: beta is a nonlinear coefficient, mu0T is the pulse pressure wave width and pi is the circumferential rate.
The method of the embodiment is a method for detecting the blocking condition in the pressure pipeline by utilizing the propagation characteristic of the pulse pressure wave, the pulse pressure wave is actively transmitted in the pipeline by rapidly opening and closing the electromagnetic valve, the pulse pressure wave is propagated along the pipeline and can be reflected when blocking occurs, then the incident and reflected signals of the pulse pressure wave are extracted, and the effective information in the incident wave and the reflected wave is analyzed, so that the number and the type of the blocking sections are accurately judged, the blocking position, the blocking rate and the blocking length are obtained by calculation, the operation is simple and convenient, and the precision is high.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.
Claims (9)
1. A method of detecting a blockage in a pressure conduit using pulsed pressure waves, comprising the steps of:
(1) emitting a section of pulse pressure wave at the inlet of the pressure pipeline;
(2) the method comprises the following steps that a high-frequency dynamic pressure sensor A is arranged at an inlet of the pressure pipeline, the high-frequency dynamic pressure sensor A records a pulse pressure wave signal S1 at the inlet of the pressure pipeline, a high-frequency dynamic pressure sensor B is arranged at a position L away from the inlet of the pressure pipeline, and the high-frequency dynamic pressure sensor B records a pulse pressure wave signal S2 at the position L away from the inlet of the pressure pipeline;
(3) analyzing the pulse pressure wave signal S1 and the pulse pressure wave signal S2 to obtain the pulse pressure wave propagation speed C and the pulse pressure wave attenuation coefficient eta;
(4) analyzing the pulse pressure wave signal S2 to obtain the blocking condition;
the step (4) is specifically as follows:
when a reflected wave with a smaller pressure fluctuation value appears after the incident wave of the pulse pressure wave signal S2, a blocked section appears in the pressure pipeline;
if the reflected wave is a single negative pulse pressure wave, the blockage condition is a short blockage section;
if the reflected wave is a single negative pulse pressure wave followed by a single positive pulse pressure wave, the blockage event is the occurrence of a long blockage segment.
2. The method for detecting the blockage in the pressure pipeline according to claim 1, wherein the pulse pressure wave is a unimodal negative pressure wave with a width less than 50ms, the signal acquisition frequency of the high-frequency dynamic pressure sensor A and the high-frequency dynamic pressure sensor B is higher than 10khz, and the pulse pressure wave is generated by the rapid opening and closing of the electromagnetic valve at the inlet of the pressure pipeline.
3. The method for detecting the blockage in the pressure pipeline using the pulsed pressure wave as claimed in claim 1, wherein the analyzing the pulsed pressure wave signal S1 and the pulsed pressure wave signal S2 is to obtain the first incident wave of the pulsed pressure wave signal S1 as D1, the first mutation point of D1 is marked as feature point 1, and the time of the feature point 1 is T1The pressure fluctuation of D1 is most equal to P1(ii) a The first incident wave of the pulse pressure wave signal S2 is D2, the first mutation point of D2 is marked as a characteristic point 2, and the time of the characteristic point 2 is T2The pressure fluctuation of D2 is most equal to P2。
4. The method for detecting the blockage in the pressure pipeline by using the pulse pressure wave as claimed in claim 3, wherein the pulse pressure wave propagation speed C and the pulse pressure wave attenuation coefficient η are obtained by calculating the pulse pressure wave propagation speed C through a wave speed formula and calculating the pulse pressure wave attenuation coefficient η through an attenuation coefficient definition; the wave velocity formula is:
the attenuation coefficient is defined as:
5. the method for detecting a blockage in a pressure conduit using pulsed pressure waves as set forth in claim 4, further comprising the steps of (5) obtaining a blockage position x and a blockage rate S for the blocked segment, and obtaining a length l for the blocked segment when the blockage is a long blocked segment; at this time, the first negative pulse pressure wave generated by the blockage section is D3, the first abrupt change point of D3 is marked as a characteristic point 3, and the time of the characteristic point 3 is T3The pressure fluctuation of D3 is most equal to P3(ii) a When the blockage condition is a long blockage section, the first negative pulse pressure wave is followed by the first positive pulse pressure wave, the first positive pulse pressure wave is D4, the first mutation point of D4 is marked as a characteristic point 4, and the time of the characteristic point 4 is T4The pressure fluctuation of D4 is most equal to P4。
6. A method of detecting a blockage in a pressure conduit using pulsed pressure waves as defined in claim 5 wherein the location of the blockage is calculated by the formula:
the calculation formula of the length of the blockage section is as follows:
7. a method of detecting a blockage in a pressure conduit using pulsed pressure waves as defined in claim 5 wherein said blockage rate is calculated by the formula:
wherein: k is the ratio of the pressure fluctuations of the reflected wave to the incident wave at the location of the blockage.
8. The method of claim 7, wherein the ratio of the pressure fluctuation mode of the reflected wave to the pressure fluctuation mode of the incident wave at the location of the blockage is calculated by the formula:
wherein XSAnd e is a natural constant, namely the stroke distance of the shock wave.
9. The method of detecting a blockage in a pressure conduit using pulsed pressure waves of claim 8 wherein said shock wave travel distance is calculated by the formula:
wherein: beta is a nonlinear coefficient, mu0T is the pulse pressure wave width and pi is the circumferential rate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811627188.7A CN109780447B (en) | 2018-12-28 | 2018-12-28 | Method for detecting blockage condition in pressure pipeline by using pulse pressure wave |
| PCT/CN2019/119199 WO2020134702A1 (en) | 2018-12-28 | 2019-11-18 | Method for pressure pipe blocking status detection using pulse pressure wave |
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| CN201811627188.7A CN109780447B (en) | 2018-12-28 | 2018-12-28 | Method for detecting blockage condition in pressure pipeline by using pulse pressure wave |
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| CA3110977C (en) * | 2018-12-05 | 2023-07-11 | Halliburton Energy Services, Inc. | Detecting and quantifying liquid pools in hydrocarbon fluid pipelines |
| CN109780447B (en) * | 2018-12-28 | 2020-11-06 | 大连理工大学 | Method for detecting blockage condition in pressure pipeline by using pulse pressure wave |
| CN113280266B (en) * | 2021-06-21 | 2022-10-04 | 上海天麦能源科技有限公司 | Urban gas medium-low pressure pipe network blockage diagnosis and positioning method and system |
| CN113670512B (en) * | 2021-07-16 | 2023-08-18 | 国家石油天然气管网集团有限公司 | Pipe cleaner blocking detection method based on mode maximum single-scale correlation |
| CN113551699B (en) * | 2021-09-17 | 2022-01-11 | 山东德仕化工有限公司 | Method and equipment for detecting blockage of oil well pipeline |
| CN113958287B (en) * | 2021-12-13 | 2022-04-05 | 德仕能源科技集团股份有限公司 | Oil well pipeline blockage removing method, equipment and medium based on artificial intelligence |
| CN116821845A (en) * | 2023-06-20 | 2023-09-29 | 郑州大学 | Pipeline siltation condition diagnosis method and device based on multi-sensor data fusion |
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| GB8716032D0 (en) * | 1987-07-08 | 1987-08-12 | British Telecomm | Duct testing |
| JPH08159400A (en) * | 1994-12-02 | 1996-06-21 | Tokyo Gas Co Ltd | Unprocessed feed pipe retrieving system |
| JP2001090900A (en) * | 1999-09-24 | 2001-04-03 | Nkk Corp | Method and device for detecting position of foreign matter in liquid transporting pipeline |
| CN102588743B (en) * | 2012-03-08 | 2013-08-07 | 东北大学 | Device and method for real-time tracking and accurate positioning for internal detector in pipeline |
| GB2506837B (en) * | 2012-08-07 | 2017-08-09 | Atmos Wave Ltd | A method of identifying leaks in a fluid carrying conduit |
| GB2517411A (en) * | 2013-07-17 | 2015-02-25 | Atmos Wave Ltd | Monitoring pipelines |
| CN104295907B (en) * | 2014-08-12 | 2017-02-15 | 上海中联重科桩工机械有限公司 | System and method for detecting blockage position of pipeline |
| CN107329167B (en) * | 2017-06-09 | 2019-05-07 | 中国石油大学(北京) | Detect method, system and the computer storage media of pipeline sediment distribution |
| CN107830412A (en) * | 2017-10-30 | 2018-03-23 | 重庆科技学院 | The incomplete blocking position detecting system of pipeline and detection method |
| CN108626579A (en) * | 2018-04-04 | 2018-10-09 | 哈尔滨商业大学 | A kind of oil pipeline wax deposition quantity measuring method based on pressure wave method |
| CN109780447B (en) * | 2018-12-28 | 2020-11-06 | 大连理工大学 | Method for detecting blockage condition in pressure pipeline by using pulse pressure wave |
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