AU2017393649B2 - Leakage positioning method based on speed difference - Google Patents
Leakage positioning method based on speed difference Download PDFInfo
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- AU2017393649B2 AU2017393649B2 AU2017393649A AU2017393649A AU2017393649B2 AU 2017393649 B2 AU2017393649 B2 AU 2017393649B2 AU 2017393649 A AU2017393649 A AU 2017393649A AU 2017393649 A AU2017393649 A AU 2017393649A AU 2017393649 B2 AU2017393649 B2 AU 2017393649B2
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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
- F17D5/02—Preventing, monitoring, or locating loss
- F17D5/06—Preventing, monitoring, or locating loss using electric or acoustic means
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Abstract
A method of locating a leak based on a speed difference. The method comprises the following steps: establishing a leak locating formula for a pipe segment to be monitored on the basis of a speed difference; installing sound sensors at one end and a middle location of the pipe segment to be monitored, and acquiring signals; defining an operational parameter from a leak point to the two sensors, and computing, according to the parameter, sound speeds of the pipe segment from the leak point to the two sensors, respectively; processing the audio signals acquired by the sensor to obtain a time difference between the times taken for the sound signals to reach the two sensors; and substituting the sound speeds and the time difference into the leak locating formula on the basis of the speed difference to determine a solution of a location of the leak point. The method of locating a leak based on a speed difference can resolve an issue in the prior art in which sensors can only be installed at two sides of a pipe. The method is low in cost, high in safety, and provides strong adaptability for an oil and gas pipe.
Description
Filed of the Invention The present invention belongs to the technical field of sound wave leakage monitoring of oil and gas pipelines, and particularly relates to a leakage positioning method based on speed difference.
Background of the Invention At present, there are many kinds of leakage monitoring methods that can be applied to oil and gas pipelines, wherein a sound wave method has many advantages compared with the traditional mass balance method, the negative pressure wave method, the transient model method and the like: the sensitivity is high, the positioning accuracy is high, the false alarm rate is low, the detection time is short, and the adaptability is high; the weak dynamic pressure change in the pipeline fluid is measured, which has nothing to do with the absolute value of a pipeline operating pressure; and the response frequency is wider, and the detection range is wider, etc. In the research on the sound wave leakage detection and positioning technology of the oil and gas pipelines, most of the current researches focus on the calculation of a time difference of the sound velocity and the sound wave to arrive at the two ends of the pipeline through sensors installed at the two ends of the pipeline, so as to realize the accurate positioning of the leakage. Many scholars at home and abroad have studied the improvement of the sound wave propagation speed and the improvement of time difference precision. According to the survey, at present, the patents related to the leakage positioning method of oil and gas pipelines based on the sound wave technology at home and abroad mainly include: The U.S. Patent No. 6,398,881 discloses a pipeline real-time leakage detection device and method based on sound wave technology. In the technology, a sensor is used for collecting a dynamic pressure in the pipeline, and filtering processing is performed on signal by using the mode matching filtering technology to eliminate the noise, reduce the interference and improve the positioning accuracy; the Chinese Patent 200810223454.X discloses a method and device for performing pipeline leakage monitoring by using dynamic pressure and static pressure data. According to the method, a dynamic pressure sensor and a static pressure sensor are respectively installed at the head end and the tail end of the pipeline to measure sound wave signals in the pipeline, leakage signals are extracted after the sound wave signals are processed by a data collection device, and a time label is marked by a GPS system to perform leakage positioning; and the Chinese patent 201510020155.6 discloses an oil and gas pipeline leakage positioning method based on sound wave amplitude. According to the method, leakage detection and positioning are performed by performing wavelet analysis processing to obtain a low-band sound wave amplitude, a propagation model of leakage sound wave in an oil and gas pipeline medium is established, and a leakage positioning method not considering the sound velocity or the time difference is proposed. The existing patents are less concerned with the leakage positioning method based on the speed difference, the implementation of the leakage positioning method relies more on the arrangement of the sensors at both ends of the pipeline to pick up the leakage signal. The specific performance is as follows: the sensors are installed at both ends of the pipeline, meanwhile when the leakage sound wave signal is propagated to the both ends of the pipeline, the leakage needs to be positioned by using a method of calculating the time difference, such that the response time is long, the investment scale is large, and the safety is low, which all reduces the feasibility and applicability of the promotion of the sound wave method.
Summary of the Invention In order to solve the deficiencies of the prior art, the present invention provides a leakage positioning method based on a speed difference, which avoids the problem that sensors must be installed at both ends of a pipeline, meanwhile when leakage positioning is performed on the pipeline, the response time becomes shorter, the investment is reduced, the safety is improved, and the feasibility and the applicability of the sound wave method are improved. In order to achieve the above functions, the present invention adopts the following technical solutions: A leakage positioning method based on a speed difference includes the following steps: step 1: establishing a leakage positioning formula based on the speed difference of a to be-measured pipe section; step 2: mounting sound wave sensors at one end and a certain point at the middle of a to be-measured pipeline, and collecting signals; step 3: defining operating parameters between a leakage point and the two sensors, and respectively calculating the sound speeds of the pipe sections between the leakage point and the sensors according to the parameters; step 4: processing the sound wave signals collected by the sensors to obtain a time difference of the sound wave signals to arrive at the two sensors; and steps 5 and 6: substituting the sound speeds and the time difference into the leakage positioning formula based on the speed difference, and performing solution to position the leakage point.
Further, in step 3, it can be seen from the calculation formula c= kzR T of the sound
speed c (m/s) that, the operating parameters include a k, volume adiabatic index; a z
compression factor; a T temperature K; a R gas constant kJ/(kg-K), wherein the
temperature can be measured by a temperature sensor installed on the pipeline, the values of
k, and z can be obtained according to the calculation method of an actual gas temperature
adiabatic index and the volume adiabatic index, and the pressure used in the calculation process can be measured by a pressure sensor. Further, in step 1, the leakage positioning formula based on the speed difference is:
C=AC2 At - C L C 1 - C2 C1 -C2
wherein, the distance between the two sensors is L, and the sound speed in the pipe
section between the leakage point and the closer sensor is cl; and the sound speed in the pipe
section between the leakage point and the other further sensor is C2 , and the time difference of
the sound wave to arrive at the two sensors is At. Further, there is a certain distance between the two sensors. Further, the time difference of the sound wave to arrive at the two sensors is the time difference of the sound wave to arrive at the further sensor and the closer sensor. According to one aspect of the present invention, there is provided a leakage positioning method based on a speed difference, comprising the following steps: step 1: establishing a leakage positioning formula based on the speed difference of a to be-measured pipe section; step 2: mounting sound wave sensors at one end and a certain point at the middle of a to be-measured pipeline, and collecting signals; step 3: defining operating parameters between a leakage point and the two sensors, and respectively calculating the sound speeds of the pipe sections between the leakage point and the sensors according to the parameters; step 4: processing the sound wave signals collected by the sensors to obtain a time difference of the sound wave signals to arrive at the two sensors; and steps 5 and 6: substituting the sound speeds and the time difference into the leakage positioning formula based on the speed difference, and performing solution to position the leakage point; and wherein in step 3, it can be seen from the calculation formula c= kzR T of the sound speed c (m/s) that, the operating parameters comprise a k, volume adiabatic index; a z compression factor; a T temperature K; a R gas constant kJ/(kg-K), wherein the temperature can be measured by a temperature sensor installed on the pipeline, the values of k, and z can be obtained according to the calculation method of an actual gas temperature adiabatic index and the volume adiabatic index, and the pressure used in the calculation process can be measured by a pressure sensor; and wherein in step 1, the leakage positioning formula based on the speed difference is:
C=AC2 At - C L CI - C2 C1 - C2
wherein, the distance between the two sensors is L, and the sound speed in the pipe
section between the leakage point and the closer sensor is cl; and the sound speed in the pipe
section between the leakage point and the other further sensor is C2 , and the time difference of
the sound wave to arrive at the two sensors is At. The present invention has the advantages that the method is simple, the operation is convenient, and the problem that the sensors must be arranged at both ends at the current stage is solved. According to the leakage positioning method based on the speed difference provided by the present invention, the leakage of the pipeline can be positioned through the established leakage positioning formula based on the speed difference of the to-be-measured pipe section, moreover, the cost is low, the safety is high, and the applicability to oil and gas pipelines is high.
Brief Description of the Drawings
Fig.1 is a schematic diagram of steps of a leakage positioning method based on a speed difference of the present invention;
Fig.2 is a schematic diagram of principles of a leakage positioning method based on a speed difference of the present invention.
Detailed Description of the Embodiments
The application principle of the present invention will be further described below in combination with the accompanying drawings and specific embodiments. As shown in Fig.1, the leakage positioning method based on the speed difference provided by the present invention includes the following steps: step S101: establishing a leakage positioning formula based on the speed difference of a to-be-measured pipe section; step S102: mounting sound wave sensors at one end and a certain point at the middle of a to-be-measured pipeline, and collecting signals; step S103: defining operating parameters between a leakage point and the two sensors,
wherein it can be seen from the calculation formula c= VkzRT of the sound speed c
(m/s) that, the operating parameters include a k, volume adiabatic index; a z compression
factor; a T temperature K; a R gas constant kJ/(kg-K), wherein the temperature can be
measured by a temperature sensor installed on the pipeline, the values of k, and z can be
obtained according to the calculation method of an actual gas temperature adiabatic index and the volume adiabatic index, and the pressure used in the calculation process can be measured by a pressure sensor, and respectively calculating the sound speeds of the pipe sections between the leakage point and the sensors according to the parameters; step S104: processing the sound wave signals collected by the sensors, and performing calculation by using a mutual correlation method to obtain a time difference of the sound wave signals to arrive at the two sensors, wherein the time difference of the sound wave to arrive at the two sensors is the time difference of the sound wave to arrive at the further sensor and the closer sensor. steps S105 and S106: substituting the sound speeds and the time difference into the leakage positioning formula based on the speed difference so as to position the leakage point. As shown in Fig.2, the specific procedures of the leakage positioning method based on the speed difference provided by the present invention are as follows: the leakage point occurs at a certain point at the upstream of the pipeline, two sensors 1 and 2 are installed at the downstream of the leakage point, the distance between the two sensors 1 and 2 is L, the sound speeds between the two sensors 1 and 2 and the leakage point are respectively cl andC2 , the time difference of the sound wave to arrive at the two sensors 1 and 2 is At, and the location of the leakage point can be solved according to the leakage positioning formula: x = C1C2 At - C1 L. C1 -C2 C1 -C2
Although the specific embodiments of the present invention have been described above in combination with the accompanying drawings, the protection scope of the present invention is not limited thereto. Those skilled in the art to which the present invention belongs should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solutions of the present invention without any creative effort shall still fall within the protection scope of the present invention.
Claims (3)
- Claims: 1. A leakage positioning method based on a speed difference, comprising the following steps: step 1: establishing a leakage positioning formula based on the speed difference of a to-be-measured pipe section; step 2: mounting sound wave sensors at one end and a certain point at the middle of a to-be-measured pipeline, and collecting signals; step 3: defining operating parameters between a leakage point and the two sensors, and respectively calculating the sound speeds of the pipe sections between the leakage point and the sensors according to the parameters; step 4: processing the sound wave signals collected by the sensors to obtain a time difference of the sound wave signals to arrive at the two sensors; and steps 5 and 6: substituting the sound speeds and the time difference into the leakage positioning formula based on the speed difference, and performing solution to position the leakage point; andwherein in step 3, it can be seen from the calculation formula c= VkzRT of thesound speed c (m/s) that, the operating parameters comprise a k, volume adiabaticindex; a z compression factor; a T temperature K; a R gas constant kJ/(kg-K),wherein the temperature can be measured by a temperature sensor installed on thepipeline, the values of k, and z can be obtained according to the calculation method of anactual gas temperature adiabatic index and the volume adiabatic index, and the pressure used in the calculation process can be measured by a pressure sensor; and wherein in step 1, the leakage positioningformula based on the speed difference is:_ C C2 At - Cl L CI -C2 CI - C2wherein, the distance between the two sensors is L, and the sound speed in the pipesection between the leakage point and the closer sensor is cl; and the sound speed in thepipe section between the leakage point and the other further sensor is C2 , and the timedifference of the sound wave to arrive at the two sensors is At.
- 2. The leakage positioning method based on the speed difference according to claim1, wherein there is a certain distance between the two sensors.
- 3. The leakage positioning method based on the speed difference according to claim 1, wherein the time difference of the sound wave to arrive at the two sensors is the time difference of the sound wave to arrive at the further sensor and the closer sensor.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710034525.0 | 2017-01-18 | ||
| CN201710034525.0A CN106813108A (en) | 2017-01-18 | 2017-01-18 | A kind of leakage locating method based on speed difference |
| PCT/CN2017/108920 WO2018133494A1 (en) | 2017-01-18 | 2017-11-01 | Method of locating leak based on speed difference |
Publications (2)
| Publication Number | Publication Date |
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| AU2017393649A1 AU2017393649A1 (en) | 2018-11-22 |
| AU2017393649B2 true AU2017393649B2 (en) | 2020-07-09 |
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| AU2017393649A Active AU2017393649B2 (en) | 2017-01-18 | 2017-11-01 | Leakage positioning method based on speed difference |
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| CN (1) | CN106813108A (en) |
| AU (1) | AU2017393649B2 (en) |
| WO (1) | WO2018133494A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106813108A (en) * | 2017-01-18 | 2017-06-09 | 中国石油大学(华东) | A kind of leakage locating method based on speed difference |
| CN107218512A (en) * | 2017-07-31 | 2017-09-29 | 西安科技大学 | A mining liquid carbon dioxide delivery device and its leakage monitoring method |
| CN108758354B (en) * | 2018-05-03 | 2023-09-12 | 太原理工大学 | Heating pipeline leakage detection system and method based on infrasound waves and reference points |
| CN110131594A (en) * | 2019-05-20 | 2019-08-16 | 辽宁石油化工大学 | A Leak Location Method Based on Ultrasonic Wave Velocity Variation |
| WO2021026645A1 (en) * | 2019-08-12 | 2021-02-18 | Hifi Engineering Inc. | Method of detecting a leak in a fluid conduit |
| US11519812B2 (en) | 2019-09-12 | 2022-12-06 | Flow International Corporation | Acoustic emissions monitoring of high pressure systems |
| US12051316B2 (en) | 2019-12-18 | 2024-07-30 | Hypertherm, Inc. | Liquid jet cutting head sensor systems and methods |
| CN114110441B (en) * | 2021-12-02 | 2023-09-15 | 西南石油大学 | A method of arranging combustible gas detectors in valve chambers of gas transmission trunk lines |
| CN114811453A (en) * | 2022-04-20 | 2022-07-29 | 安徽理工大学 | A method for acoustic location of pipeline leakage based on delay summation |
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| CN103672415A (en) * | 2013-12-06 | 2014-03-26 | 中国石油大学(华东) | Gas pipeline leakage detecting and positioning system and method based on non-intrusive sensor |
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2017
- 2017-01-18 CN CN201710034525.0A patent/CN106813108A/en active Pending
- 2017-11-01 AU AU2017393649A patent/AU2017393649B2/en active Active
- 2017-11-01 WO PCT/CN2017/108920 patent/WO2018133494A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5548530A (en) * | 1995-04-24 | 1996-08-20 | Baumoel; Joseph | High-precision leak detector and locator |
| US20120243376A1 (en) * | 2009-09-29 | 2012-09-27 | Eni S.P.A. | System and method for the continuous detection of impacts on pipelines for the transportation of fluids, particularly suitable for underwater pipelines |
| CN103672415A (en) * | 2013-12-06 | 2014-03-26 | 中国石油大学(华东) | Gas pipeline leakage detecting and positioning system and method based on non-intrusive sensor |
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| Publication number | Publication date |
|---|---|
| CN106813108A (en) | 2017-06-09 |
| AU2017393649A1 (en) | 2018-11-22 |
| WO2018133494A1 (en) | 2018-07-26 |
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