CN107883198A - A kind of oil-gas pipeline weld leakage monitoring device - Google Patents
A kind of oil-gas pipeline weld leakage monitoring device Download PDFInfo
- Publication number
- CN107883198A CN107883198A CN201711082048.1A CN201711082048A CN107883198A CN 107883198 A CN107883198 A CN 107883198A CN 201711082048 A CN201711082048 A CN 201711082048A CN 107883198 A CN107883198 A CN 107883198A
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- China
- Prior art keywords
- oil
- annular electrode
- monitoring device
- gas pipeline
- isolation layer
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Classifications
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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
Abstract
The present invention relates to a kind of oil-gas pipeline weld leakage monitoring device, mainly including annular electrode, dielectric isolation layer, insulating protective layer, capacitance sensor, signal acquisition time module and monitoring host computer.Its measuring principle is：Annular electrode, dielectric isolation layer, pipeline outer wall three form cylindrical capacitor, if weld seam occurs perforation or cracked causes leakage, leaking medium enters the annular space that pipeline outer wall and annular electrode are formed, and changes the dielectric constant of dielectric, so that capacitance is undergone mutation.Signal acquisition time module is scanned to the capacitance of each commissure, and the position input monitoring main frame for recording current weld seam simultaneously carries out leak detection and location.Compared with prior art, the present invention has the advantages that applied widely, simple in construction, positioning is rapid, positioning precision is high, cost is cheap, safe and reliable, is with a wide range of applications.
Description
Technical field:
The present invention discloses a kind of oil-gas pipeline weld leakage monitoring device, in particular for conveying the weldering of the metallic conduit of oil gas
The monitoring and warning and positioner for the leakage that perforation, crackle at seam caused by stress concentration, corrosion etc. are triggered.
Background technology:
In petroleum chemical industry, a kind of important way of the pipeline transportation as transfer oil natural gas, by its freight volume
Greatly, the advantages that occupation of land is less, the investment construction cycle is short, expense is low, safe and reliable is widely used.Pipeline is in welding process
In the weld defects such as lack of penetration, stomata, slag inclusion, crackle generally occur, weld seam is pipeline weakest link, is that leakage occurs is high
Risk area.Blow-by tube inner high voltage oil gas, which occurs, for pipeline can enter environment, cause huge economic loss and environmental pollution, serious shadow
Ring production and endanger public security.
Domestic and international existing pipeline leakage detection method mainly has following several：
(1) negative pressure wave method：When leakage accident occurs for pipeline, material damage occurs immediately at leakage, and causes local close
Degree reduces, and in turn results in pressure reduction., can be in leak and its either end stream because fluids within pipes can not change flow velocity immediately
Pressure difference is produced between body.Decompression wave is known as suction wave caused by leakage.The sensor at leakage point both ends is arranged on according to pressure
The time difference that suction wave caused by the change and leakage of signal travels to upstream and downstream is assured that leak position.But this method
Early warning when being mainly used in leaking firm generation, then it can not detect and position for the stable leakage having occurred and that, in addition for small
Leak detection difficulty is very big.
(2) mass balance approach：Under normal operating conditions, the input of pipeline and output quality should be equal, and leakage is inevitable
Produce of poor quality.Mass balance approach is most basic leakage detection method, and reliability is high.Due to pipe leakage location algorithm convection current
Measurement error is very sensitive, and pipe leakage position error is 6~7 times of flow measurement error, therefore flow measurement error
The positioning precision of pipeline leakage testing can be significantly improved by reducing.Mass balance approach is applied to crude oil and processed oil pipeline, in state
Inside typically it is used in combination with pressure wave method.Its shortcoming is：It is limited to accuracy of instrument, it is impossible to be accurately positioned.
(3) thermal infrared imaging method：Using influence of the leakage liquid to infra-red radiation, pass through the normal temperature with surrounding soil
It is compared, so as to reach testing goal.This method detects suitable for gas pipeline leakage, but this kind of method can not be to pipeline
Continuously detected, the poor real and depth of burying to pipeline has certain limitations.
The defects of in order to overcome above-mentioned prior art, the present invention propose a kind of condenser type leakage monitor, can be to pipe
Wire bonding seam carries out monitoring and accurately determining leak position in real time, so as to provide science accurate foundation for emergency first-aid repair.
By the additional one layer of endless metal of dielectric isolation layer in the easy leak such as metallic conduit weld seam, make annular gold
Category, anti-corrosion insulating layer, metallic conduit tube wall three form electric capacity.If pipeline or anti-corrosion insulating layer leak, the electricity of electric capacity
Significant change can occur therewith for capacitance, and the leakage point of pipeline is judged with this.
The content of the invention：
The present invention relates to a kind of oil-gas pipeline weld leakage monitoring device, mainly including annular electrode, dielectric isolation layer, absolutely
Edge protective layer, capacitance sensor, signal acquisition time module and monitoring host computer, the outer wall of metallic conduit to be measured is along even weld
Dielectric isolation layer is coated with, the inner surface of dielectric isolation layer and the outer wall of pipeline are in close contact, the outer surface peace of dielectric isolation layer
Equipped with annular electrode, the outer surface of annular electrode is coated with insulating protective layer, and the tube wall and annular electrode of metallic conduit lead to respectively
Wire is crossed with capacitance sensor to be connected, capacitance sensor is connected with signal acquisition time module, signal acquisition time module with
Monitoring host computer is connected.
Described annular electrode material is easy conductive, corrosion resistant metal, and width is about 3~4 times of weld width.
The material of described dielectric isolation layer is non-conductive porous media, and its optimum thickness is 0.5~5mm.
The material of described insulating protective layer is non-conductive, impermeable compact medium.
Described signal acquisition time module is mainly by time schedule controller, signal amplifier, A/D converter and weld seam position
Put memory composition.
Compared with prior art, the present invention has the advantages that：
(1) instantaneous and continuous release can be monitored；
(2) early warning high sensitivity, minute leakage can be detected；
(3) positioning precision is high, and position error is less than 5cm；
(4) it is applied widely, the leakage monitoring available for air delivering pipeline, pipeline road and gas-liquid delivery pipeline；
(5) device composition is simple, and strong applicability is easy to operate.
Brief description of the drawings：
Fig. 1 is general structure schematic diagram of the present invention；
Fig. 2 is capacitive measuring principle figure of the present invention；
Fig. 3 is signal acquisition time module composition schematic diagram of the present invention；
Fig. 4 is leakage monitoring principle schematic of the present invention.
Embodiment:
As shown in figure 1, the present invention relates to a kind of oil-gas pipeline weld leakage monitoring device, mainly include annular electrode 1, absolutely
Edge separation layer 2, insulating protective layer 3, capacitance sensor 4, signal acquisition time module 5 and monitoring host computer 6, metallic conduit to be measured
7 outer wall is uniformly coated with dielectric isolation layer 2 along weld seam 8, and the inner surface of dielectric isolation layer 2 is in close contact with the outer wall of pipeline 7, insulation
The outer surface of separation layer 2 is provided with annular electrode 1, and the outer surface of annular electrode 1 is coated with insulating protective layer 3, the pipe of metallic conduit 7
Wall and annular electrode 1 are connected by wire with capacitance sensor 4 respectively, capacitance sensor 4 and the phase of signal acquisition time module 5
Even, signal acquisition time module 5 is connected with monitoring host computer 6.
As shown in figure 1, the material of described annular electrode 1 is easy conductive, corrosion resistant metal, width is about the width of weld seam 8
3~4 times.
As shown in Fig. 2 the material of described dielectric isolation layer 2 is non-conductive porous media, its optimum thickness is 1~5mm.
The annular space that outer wall and annular electrode 1 of the dielectric isolation layer 2 full of metallic conduit 7 are formed, its effect is by tube wall metal
Isolate with annular electrode 1, avoid the two from directly contacting；In addition, dielectric isolation layer 2 is made up of porous media, gas phase or liquid in pipe
, can be quickly by porous media in the annular space that metallic conduit outer surface and annular electrode 1 are formed after phase fluid leakage
Diffusion.
As shown in Fig. 2 the material of described insulating protective layer 3 is non-conductive fine and close dielectric, insulating protective layer 3 is installed
On the outer surface of annular electrode 1, its act on be protect annular electrode 1 do not deform or other damage.
As shown in figure 3, described signal acquisition time module 5 is mainly turned by time schedule controller 9, signal amplifier 10, A/D
Parallel operation 11 and position while welding memory 12 form；Time schedule controller 9 is mainly used in carrying out soon all weld seams of metallic conduit 78
Speed scanning, records current weld seam capacitance data and current position while welding.
Operation principle of the present invention is described as follows：
As shown in figure 1, the tube wall three of annular electrode 1, dielectric isolation layer 2, metallic conduit 7 forms cylindrical capacitor,
Its capacitance size is calculated by following formula：
In formula, ε be dielectric dielectric constant, L be annular electro pole plate 1 width, D1For the external diameter of metallic conduit 7, D2
For the internal diameter of annular electrode 1.
After metallic conduit 7 and the structure of annular electrode 1 are fixed, from formula (1), capacitance depends primarily on insulation and is situated between
The permittivity ε of matter；Because dielectric isolation layer 2 is very thin, only 0.5~5mm, from formula (1), D2With D1Ratio approach
1, change of the capacitance to electric constant ε is very sensitive, and small electric constant ε changes will cause capacitance significantly to change.
As shown in figure 3, the leakage monitoring of pipeline plurality of positions is carried out in order to real-time online, using acquisition time module
5 carry out data acquisition control, and the break-make of each sensor and Acquisition Circuit is controlled using high-speed analog switch, so as to realize collection
The time-sharing multiplex function of circuit；Signal acquisition time module 5 is scanned to the capacitance at each weld seam 8, and is recorded simultaneously
The position input computer of current weld seam is analyzed and processed；Time schedule controller 9 in signal acquisition time module 5 is used to connect
Capacitance present sensor.Signal amplifier 10 is used to amplify capacitance signal, and A/D converter 11 is used to capacitance signal being converted into number
Word signal, the geographical coordinate of weld seam corresponding to each capacitance sensor, which just records, to be stored in position while welding memory 12；Signal
Acquisition time module 5 by position while welding where capacitance present signal and capacitance present, analyzed in the lump by input monitoring main frame 6
Processing.
Carrying out practically process is：At a time, monitoring host computer 6 sends acquisition instructions, letter to signal acquisition time module 5
Number acquisition time module 5 controls power switch and signaling switch to gather some capacitance sensor 4 and measure by time schedule controller 9
Capacitance signal, and by signal amplification, A/D conversions, record and transmit to monitoring host computer 6, with this after capacitance present signal
Meanwhile acquisition time module 5 also by position while welding memory 12 transfer current welding seam position information and with capacitance present signal
Monitoring host computer 6 is sent to together；Subsequent time, monitoring host computer 6 send next acquisition instructions to signal acquisition time module 5,
Signal acquisition time module 5 controls power switch and signaling switch to gather electricity corresponding to next weld seam by time schedule controller 9
Hold the signal that sensor 4 measures, and transmitted after signal amplification, A/D conversions, record next but one capacitance signal to monitoring
Main frame 6, at the same time, now the positional information of weld seam 8 is sent to monitoring host computer 6 together with corresponding capacitance signal；So circulation
Back and forth, the acquisition time to all capacitive sensor signals on pipeline can be realized；If managed at where some capacitance sensor 4
Road leaks, by the present invention can real-time online determine leak position.
As shown in figure 4, if perforation or cracked occurs for weld seam 8, medium will occur under differential pressure effect inside and outside pipeline
Leakage, leakage gas, liquid medium is by the porous media material of dielectric isolation layer 2 in the outer wall of metallic conduit 7 and the institute of annular electrode 1
Diffusive transport in the annular space of formation, change the permittivity ε of dielectric, so that capacitance is undergone mutation；It is this different
After normal capacitance signal is measured by capacitance sensor 4, monitoring host computer 6 is sent to by signal acquisition time module 5；Monitoring host computer 6
Current weld seam is surveyed into capacitance signal to be contrasted with last moment capacitance signal, if significant changes occur, can determine whether the weldering
There occurs dielectric leakage at seam；Because geographic coordinate information where the weld seam is known, emergency management and rescue strength can be rushed towards immediately
The commissure carries out emergency first-aid repair.
Because gas leakage, liquid and gas-liquid polyphase flow can cause the change of dielectric constant, therefore the present invention is not only
Available for air delivering pipeline and pipeline road, it may also be used for the real-time monitoring of oil and gas multiphase flow pipeline weld leakage；With prior art phase
Than, the signal transacting that the present invention need not be complicated, have it is applied widely, it is simple in construction, positioning is rapid, positioning precision is high, into
The advantages that this is cheap, safe and reliable, is with a wide range of applications.
Claims (5)
- A kind of 1. oil-gas pipeline weld leakage monitoring device, it is characterised in that：Mainly include annular electrode (1), dielectric isolation layer (2), insulating protective layer (3), capacitance sensor (4), signal acquisition time module (5) and monitoring host computer (6), metal tube to be measured The outer wall in road (7) is uniformly coated with dielectric isolation layer (2), inner surface and the metal tube to be measured of dielectric isolation layer (2) along weld seam (8) The outer wall in road (7) is in close contact, and the outer surface of dielectric isolation layer (2) is provided with annular electrode (1), the appearance of annular electrode (1) Bread is covered with insulating protective layer (3), and the tube wall and annular electrode (1) of metallic conduit (7) pass through wire and capacitance sensor respectively (4) it is connected, capacitance sensor (4) is connected with signal acquisition time module (5), and signal acquisition time module (5) is led with monitoring Machine (6) is connected.
- A kind of 2. oil-gas pipeline weld leakage monitoring device according to claim 1, it is characterised in that：Described annular electro The material of pole (1) is easy conductive, corrosion resistant metal, and width is about 3~4 times of weld seam (8) width.
- A kind of 3. oil-gas pipeline weld leakage monitoring device according to claim 1, it is characterised in that：Described insulation every The material of absciss layer (2) is non-conductive porous media, and its optimum thickness is 0.5~5mm.
- A kind of 4. oil-gas pipeline weld leakage monitoring device according to claim 1, it is characterised in that：Described insulation is protected The material of sheath 3 is non-conductive, impermeable compact medium.
- A kind of 5. oil-gas pipeline weld leakage monitoring device according to claim 1, it is characterised in that：Described signal point When acquisition module (5) mainly by time schedule controller (9), signal amplifier (10), A/D converter (11) and position while welding store Device (12) forms.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711082048.1A CN107883198A (en) | 2017-11-07 | 2017-11-07 | A kind of oil-gas pipeline weld leakage monitoring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711082048.1A CN107883198A (en) | 2017-11-07 | 2017-11-07 | A kind of oil-gas pipeline weld leakage monitoring device |
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| CN107883198A true CN107883198A (en) | 2018-04-06 |
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| CN201711082048.1A Pending CN107883198A (en) | 2017-11-07 | 2017-11-07 | A kind of oil-gas pipeline weld leakage monitoring device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109538948A (en) * | 2019-01-29 | 2019-03-29 | 河海大学常州校区 | A kind of detection method of the buried liquid-filling pipe leakage based on pore media parameter |
| CN109838695A (en) * | 2019-01-23 | 2019-06-04 | 洛阳双瑞特种装备有限公司 | A kind of interior die mould expansion joint device for detecting axial displacement |
| CN110208336A (en) * | 2019-06-14 | 2019-09-06 | 国网天津市电力公司电力科学研究院 | A kind of cable epoxy mud sealing property detection device and its detection method |
| CN112503403A (en) * | 2020-11-27 | 2021-03-16 | 国网山东省电力公司建设公司 | Underground pipe network leakage monitoring and positioning system and method |
| RU212312U1 (en) * | 2021-10-26 | 2022-07-15 | Максим Михайлович Адмакин | Piping element |
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| CN205175626U (en) * | 2015-12-02 | 2016-04-20 | 深圳凌水环保科技股份有限公司 | Water supply and drainage pipe leak testing system |
| CN106123109A (en) * | 2016-08-05 | 2016-11-16 | 倪晨钧 | A kind of pepe monitoring system |
| CN106122773A (en) * | 2016-07-06 | 2016-11-16 | 中国石油大学(华东) | A kind of oil and gas pipes weld leakage monitoring device |
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2017
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN205175626U (en) * | 2015-12-02 | 2016-04-20 | 深圳凌水环保科技股份有限公司 | Water supply and drainage pipe leak testing system |
| CN106122773A (en) * | 2016-07-06 | 2016-11-16 | 中国石油大学(华东) | A kind of oil and gas pipes weld leakage monitoring device |
| CN106123109A (en) * | 2016-08-05 | 2016-11-16 | 倪晨钧 | A kind of pepe monitoring system |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109838695A (en) * | 2019-01-23 | 2019-06-04 | 洛阳双瑞特种装备有限公司 | A kind of interior die mould expansion joint device for detecting axial displacement |
| CN109538948A (en) * | 2019-01-29 | 2019-03-29 | 河海大学常州校区 | A kind of detection method of the buried liquid-filling pipe leakage based on pore media parameter |
| CN109538948B (en) * | 2019-01-29 | 2020-04-03 | 河海大学常州校区 | Detection method for leakage of buried liquid filling pipeline based on pore medium parameters |
| CN110208336A (en) * | 2019-06-14 | 2019-09-06 | 国网天津市电力公司电力科学研究院 | A kind of cable epoxy mud sealing property detection device and its detection method |
| CN112503403A (en) * | 2020-11-27 | 2021-03-16 | 国网山东省电力公司建设公司 | Underground pipe network leakage monitoring and positioning system and method |
| RU212312U1 (en) * | 2021-10-26 | 2022-07-15 | Максим Михайлович Адмакин | Piping element |
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Application publication date: 20180406 |