CN103376289A - Weak magnetic internal detection method for stress concentration area of long oil and gas pipeline - Google Patents
Weak magnetic internal detection method for stress concentration area of long oil and gas pipeline Download PDFInfo
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- 230000008569 process Effects 0.000 claims description 5
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- 230000007547 defect Effects 0.000 abstract description 4
- 230000005540 biological transmission Effects 0.000 abstract 1
- 230000004907 flux Effects 0.000 abstract 1
- 230000035882 stress Effects 0.000 description 39
- 239000010985 leather Substances 0.000 description 11
- 239000002184 metal Substances 0.000 description 6
- 238000005086 pumping Methods 0.000 description 6
- 230000003321 amplification Effects 0.000 description 4
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Abstract
The invention discloses a weak magnetic internal detection method for a stress concentration area of a long oil and gas transmission pipeline, which comprises the following steps: carrying out weak magnetic detection on the interior of the pipeline through a weak magnetic detection device arranged in the long oil and gas pipeline, and acquiring a magnetic leakage signal in the pipeline; carrying out data processing on the acquired magnetic flux leakage signal to judge the stress concentration defect in the measured pipeline; and determining the position of the internal stress concentration area of the measured pipeline by combining the motion trail of the weak magnetic detection device. The invention detects the stress concentration area in the long oil and gas pipeline based on the magnetic memory method, obtains the magnetic memory signal of the magnetic leakage in the pipeline by detecting the magnetic leakage signal in the pipeline, analyzes and judges the stress concentration condition in the pipeline in time, and realizes the detection of the internal stress concentration area of the long oil and gas pipeline.
Description
Technical field
The present invention relates to a kind of interior detection method of weak magnetic of long oil and gas pipeline region of stress concentration, the interior detection that is applicable to long oil and gas pipeline is used.
Background technology
Detection method (as: RT, UT, MT etc.) commonly used all belongs to active detection, can't detect the stress concentration point that pipeline can't discharge through pressure testing after tubulation and construction are finished.The critical point that may be in permissible stress that these stress concentration points have, the conduit running booster that just may lose efficacy during to the fatigue phase.
Summary of the invention
In order to realize the detection of long oil and gas pipeline internal stress concentrated area, the invention provides a kind of interior detection method of weak magnetic of long oil and gas pipeline region of stress concentration, by the detection to magnetic leakage signal in the pipeline, obtain the magnetic memory signal of leakage field in the pipeline, in time the stress in the pipeline is concentrated situation to make and analyzed and judge.
Described technical scheme is as follows: detection method in a kind of weak magnetic of long oil and gas pipeline region of stress concentration, and described method comprises:
Detect by placing weak magnetic detection device in the long oil and gas pipeline that pipe interior is carried out weak magnetic, and obtain magnetic leakage signal in the pipeline; The magnetic leakage signal of obtaining is carried out data process, judge institute's test tube road stress concentration defective; Determine the position in stress concentration district, institute test tube road in conjunction with the movement locus of weak magnetic detection device.
Concentrate defective to judge that its concrete grammar is according to leaking hunting magnetic signal counter stress: the tangential component Hp (x) of stray field Hp is maximal value in the institute test tube road, and its normal component Hp (y) is that zero zone is area of stress concentration.
The beneficial effect of the technical scheme that the embodiment of the invention provides is:
Pick-up unit enters pipeline by the initial pumping plant pipeline service of pipeline wound packages in the weak magnetic of long oil and gas pipeline, promoted by the pipeline pumped (conveying) medium, pipeline detection is carried out in operation in pipeline, the ball collecting chamber that stops pumping plant at pipeline takes out checkout equipment finishes detection, area of stress concentration gathers based under the low-intensity magnetic field generally speaking corresponding to the metal fatigue district, the impact that space magnetic field is distributed by analyzing different stress fatigues, the variation in measurement space magnetic field obtains the distribution situation of low-intensity magnetic field.
Judge defect characteristic by the analysis to signal; Under magnetic memory detection mode, can find out, forming maximum stray field Hp at area of stress concentration changes, the tangential component Hp (x) that is stray field has maximal value, and normal component Hp (y) has zero point, the present invention is according to this feature, by carrying out data and process collecting in the pipeline stray field signal, position and the fatigue damage that can determine long oil and gas pipeline stress concentration district form degree.
Description of drawings
In order to be illustrated more clearly in the technical scheme in the embodiment of the invention, the accompanying drawing of required use was done to introduce simply during the below will describe embodiment, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is detection method block diagram in the weak magnetic of long oil and gas pipeline provided by the present invention;
Fig. 2 is area of stress concentration Magnetic fluxleakage distribution situation principle sketch of the present invention;
Fig. 3 detects the data sectional drawing in the weak magnetic of long oil and gas pipeline provided by the present invention;
Fig. 4 is structure of the detecting device figure in the weak magnetic of long oil and gas pipeline provided by the present invention;
Fig. 5 is the general frame of on-line measuring device of the present invention;
Fig. 6 is the weak magnetic sensor structured flowchart;
Fig. 7 is the weak magnetic sensor circuit block diagram.
Among the figure: 1-power section, 11-power joint, power leather cup before the 12-, power leather cup behind the 13-, 14-energy-storage battery; The 2-universal joint; The 3-test section, 31-measures joint, 32-detection position record cell, 33-weak magnetic sensor, 331-field coil, 332-measuring coil, the high conducting magnet core of 333-, 34-low frequencies device; The 4-support; 5-supports leather cup; The 6-mileage recording device; The 7-test specimen; 8-stress concentration line; The 9-stray field.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, embodiment of the present invention is described further in detail below in conjunction with accompanying drawing.
The invention provides a kind of interior detection method of weak magnetic of long oil and gas pipeline region of stress concentration, as shown in Figure 1, described method comprises:
Detect by placing weak magnetic detection device in the long oil and gas pipeline that pipe interior is carried out weak magnetic, and obtain magnetic leakage signal in the pipeline; The magnetic leakage signal of obtaining is carried out data process judgement institute test tube road stress concentration defective; Determine the position in stress concentration district, institute test tube road in conjunction with the movement locus of weak magnetic detection device.
Concentrate defective to judge that its concrete grammar is according to leaking hunting magnetic signal counter stress: the tangential component Hp (x) of stray field Hp is maximal value in the institute test tube road, and its normal component Hp (y) is that zero zone is area of stress concentration.
Pick-up unit enters pipeline by the initial pumping plant pipeline service of pipeline wound packages in the weak magnetic of long oil and gas pipeline, promoted by the pipeline pumped (conveying) medium, pipeline detection is carried out in operation in pipeline, the ball collecting chamber that stops pumping plant at pipeline takes out checkout equipment finishes detection, area of stress concentration gathers based under the low-intensity magnetic field generally speaking corresponding to the metal fatigue district, the impact that space magnetic field is distributed by analyzing different stress fatigues, the variation in measurement space magnetic field obtains the distribution situation of low-intensity magnetic field.
By the analysis of signal being judged the feature of defective; Under magnetic memory detection mode, area of stress concentration Magnetic fluxleakage distribution situation is by shown in Figure 2, by test specimen 7 is tested, can see that the area of stress concentration at stress concentration line 8 forms maximum stray field Hp variation, the tangential component Hp (x) that is stray field has maximal value, and normal component Hp (y) has zero point.According to these features, proposition is under the weakly magnetization level, the Magnetic fluxleakage distribution feature situation of metal loss defects and area of stress concentration, and by the stray field signal that collects being carried out the data processing, can judge that shape, area of stress concentration position and the fatigue damage of defective forms degree.
The analysis of weak magnetic signal is being judged on the defect characteristic basis, proposition is under the weakly magnetization level, the low-intensity magnetic field distribution characteristics situation on girth joint and pipeline of area of stress concentration is processed by the low-intensity magnetic field signal that collects being carried out data, judges defective, area of stress concentration position.
Fig. 3 detected data plot in inner minute for the weak magnetic of long oil and gas pipeline, by finding out clearly among the figure: the signal that the A place detects for girth joint among the figure is the thermal stress district, stress concentrates direction and the size of signal A place signal characterizing stress direction and intensity, the B place is pipe stress concentrated area signal, and the correspondence of A, B signal is determined the signal of region of stress concentration.
As shown in Figure 4 and Figure 5, the invention provides pick-up unit in the weak magnetic of a kind of long oil and gas pipeline, it comprises power section 1 and test section 3, and power section 1 and test section 3 are flexible coupling by universal joint 2, can realize that pick-up unit connects in the flexibility turning of long oil and gas pipeline inside.
Wherein power section 1 comprises power joint 11 and power leather cup 12,13, the power leather cup is arranged at the two ends of power joint 11, be respectively front power leather cup 12 and rear power leather cup 13, front and back power leather cup 12,13 is nested with and is fixed on the power joint, and its cylindrical and oil and gas pipes inwall are suitable, be provided with a chamber in the power joint, be provided with energy storage device in the chamber, the energy storage device here comprises battery and DC-DC change-over panel, is used for powering to the test section.
Measure an end of joint 31 and an end of power joint 11 and be flexible coupling by universal joint 2, detection position record cell 33 is arranged at the other end of measuring joint 31, and low frequencies device 34 is arranged at the other end of power joint 11, and weak magnetic detection components is arranged to be measured on the joint 31.
The two ends of measuring joint 31 are respectively equipped with one and support leather cup 5, and support leather cup 5 is suitable with the oil and gas pipes inwall, are used for supporting measuring and save 31.
As shown in Figure 5, wherein weak magnetic detection components comprises:
Weak magnetic detector, it is fixed in relatively by a support 4 measures on the joint 31, carries out weak magnetic for the region of stress concentration to oil and gas pipes and detects;
Signal gathering unit, be used for gathering the signal that weak magnetic detector detects oil and gas pipes, it comprises employing multi-channel analog gating switch and connected A/D converter, and the weak magnetic signal that weak magnetic detector detects transfers to the industrial computer processing unit after multi-channel analog gating switch and A/D converter conversion;
The industrial computer processing unit receives the collection signal of signal acquisition circuit plate, and finishes processing and the record of detection signal.
In addition, also be provided with the detection to the forward and backward pressure of pick-up unit in pick-up unit, its pressure detecting signal is transferred to the industrial computer processing unit equally, and carries out data and process.
Detection position record cell wherein comprises:
Rotary encoder is connected with the industrial computer processing unit, is used for the circumferential detection orientation of record pipeline;
Mileage recording device comprises walking mileage wheel, pulse producer sum counter, and counter is connected with the industrial computer processing unit, and pulse producer, counter are used for the axial orientation of record oil and gas pipes.
Weak magnetic detector comprises: a plurality of weak magnetic sensors 32 and self-correcting module, a plurality of weak magnetic sensors 32 circumferentially are fixed on the support 4 along oil and gas pipes, self-correcting module and weak magnetic sensor 32 connect one to one, it adjusts the intensity of weak magnetic sensor 32 detection signals automatically according to distance size between weak magnetic sensor 32 and the pipe under test metal surface, weak magnetic sensor arranges six along oil and gas pipes is circumferentially uniform, also can arrange a plurality of.
Also be provided with in addition debugging apparatus, be used for the industrial computer processing unit is debugged, it comprises host computer debugging computer and RS232 interface, and RS232 interface wherein is connected with the industrial computer processing unit.
As shown in Figure 7, the self-correcting module comprises self-correcting circuit, resonance signal generator and amplification treatment circuit, the self-correcting circuit is connected with amplification treatment circuit with described resonance signal generator respectively, and described resonance signal generator is connected with amplification treatment circuit with described weak magnetic sensor and is connected.
The industrial computer processing unit comprises industrial control computer mainboard and data-carrier store, industrial control computer mainboard is connected with data-carrier store, data-carrier store is used for the detection orientation of storage oil and gas pipes and detects data, the data-carrier store here is a hard disk, and industrial control computer mainboard of the present invention is the PC104 industrial control computer mainboard.
Wherein Fig. 6 is the structural representation of weak magnetic sensor provided by the present invention, it is comprised of drive coil 331, measuring coil 332 and high conducting magnet core 333, Weak magentic-field sensor and metal surface to be measured form a stable equivalent inductance, between in the situation of change of distance, the self-correcting circuit will be adjusted the resonance signal frequency generator, make it reach resonance, reach the optimum detection signal.
Pick-up unit enters pipeline by the initial pumping plant pipeline service of pipeline wound packages in the weak magnetic of long oil and gas pipeline, promoted by the pipeline pumped (conveying) medium, pipeline detection is carried out in operation in pipeline, the ball collecting chamber that stops pumping plant at pipeline takes out pick-up unit finishes detection, equipment is comprised of power and measurement two parts: leather cup is equipped with in power section, produce pressure reduction thrust unit walking work for delivery of medium, inside is equipped with battery sufficient electric energy is provided for pick-up unit works long hours in pipeline, measure portion is equipped with weak magnetic sensor and industrial computer processing unit, be used for measuring-signal and signal is carried out the amplification filtering record, area of stress concentration is generally speaking corresponding to the metal fatigue district, gather based under the low-intensity magnetic field, the impact that space magnetic field is distributed by analyzing different stress fatigues, the variation in measurement space magnetic field, obtain the distribution situation of stray field, and can from mileage record, demonstrate the position at damage field place.
The invention described above embodiment sequence number does not represent the quality of embodiment just to description.
The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (2)
1. detection method in the weak magnetic of a long oil and gas pipeline region of stress concentration is characterized in that described method comprises:
Detect by placing weak magnetic detection device in the long oil and gas pipeline that pipe interior is carried out weak magnetic, and obtain magnetic leakage signal in the pipeline; The magnetic leakage signal of obtaining is carried out data process, judge institute's test tube road stress concentration defective; Determine the position in stress concentration district, institute test tube road in conjunction with the movement locus of weak magnetic detection device.
2. detection method in the weak magnetic according to claim 1 is characterized in that,
Concentrate defective to judge that its concrete grammar is according to leaking hunting magnetic signal counter stress: the tangential component Hp (x) of stray field Hp is maximal value in the institute test tube road, and its normal component Hp (y) is that zero zone is area of stress concentration.
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| CN2012101092548A CN103376289A (en) | 2012-04-13 | 2012-04-13 | Weak magnetic internal detection method for stress concentration area of long oil and gas pipeline |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104898182A (en) * | 2015-06-01 | 2015-09-09 | 广东省特种设备检测研究院 | Sample tube and verifying method for verifying test capability of stress concentration magnetic detector |
| CN105320994A (en) * | 2014-07-30 | 2016-02-10 | 中国石油天然气集团公司 | Oil and gas pipeline safety assessment method and device |
| CN105319570A (en) * | 2015-11-25 | 2016-02-10 | 中国船舶重工集团公司第七二二研究所 | Device for tracking pipeline detector |
| CN107102056A (en) * | 2017-03-22 | 2017-08-29 | 清华大学 | The flexible construction method of the unit of defect and magnetic leakage signal |
| CN107490617A (en) * | 2017-08-21 | 2017-12-19 | 太原理工大学 | The weak magnetic Non-Destructive Testing sensor and application method of a kind of coal bed gas defect of pipeline |
| CN107917952A (en) * | 2017-11-15 | 2018-04-17 | 四川钜莘信合科技有限公司 | Oil-gas pipeline detection device and method |
| CN109001294A (en) * | 2017-06-06 | 2018-12-14 | 中国石油天然气股份有限公司 | Pipeline inner wall detection device |
| CN110082425A (en) * | 2019-05-31 | 2019-08-02 | 中国计量大学 | A kind of three-dimensional leakage field and Magnetic Memory pipeline defect detecting system |
| CN110412120A (en) * | 2019-06-26 | 2019-11-05 | 中国石油天然气股份有限公司 | Pipeline crack detection method and device |
| CN110793852A (en) * | 2019-11-08 | 2020-02-14 | 沈阳工业大学 | Pipeline stress internal detection method based on complex stress state model |
| CN111912897A (en) * | 2020-08-11 | 2020-11-10 | 中国石油大学(北京) | Method, device and equipment for acquiring pipeline defect information and storage medium |
| CN112835109A (en) * | 2021-03-17 | 2021-05-25 | 华孚油气工程技术成都有限公司 | Pipeline weak magnetic positioning method for detector in long-distance pipeline |
| CN113701728A (en) * | 2021-07-19 | 2021-11-26 | 深圳大学 | Pipeline measuring robot |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105320994A (en) * | 2014-07-30 | 2016-02-10 | 中国石油天然气集团公司 | Oil and gas pipeline safety assessment method and device |
| CN105320994B (en) * | 2014-07-30 | 2019-03-15 | 中国石油天然气集团公司 | A kind of method and apparatus of oil-gas pipeline safety assessment |
| CN104898182A (en) * | 2015-06-01 | 2015-09-09 | 广东省特种设备检测研究院 | Sample tube and verifying method for verifying test capability of stress concentration magnetic detector |
| CN105319570A (en) * | 2015-11-25 | 2016-02-10 | 中国船舶重工集团公司第七二二研究所 | Device for tracking pipeline detector |
| CN107102056A (en) * | 2017-03-22 | 2017-08-29 | 清华大学 | The flexible construction method of the unit of defect and magnetic leakage signal |
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| CN107490617A (en) * | 2017-08-21 | 2017-12-19 | 太原理工大学 | The weak magnetic Non-Destructive Testing sensor and application method of a kind of coal bed gas defect of pipeline |
| CN107917952A (en) * | 2017-11-15 | 2018-04-17 | 四川钜莘信合科技有限公司 | Oil-gas pipeline detection device and method |
| CN110082425A (en) * | 2019-05-31 | 2019-08-02 | 中国计量大学 | A kind of three-dimensional leakage field and Magnetic Memory pipeline defect detecting system |
| CN110412120A (en) * | 2019-06-26 | 2019-11-05 | 中国石油天然气股份有限公司 | Pipeline crack detection method and device |
| CN110793852A (en) * | 2019-11-08 | 2020-02-14 | 沈阳工业大学 | Pipeline stress internal detection method based on complex stress state model |
| CN110793852B (en) * | 2019-11-08 | 2022-07-15 | 沈阳工业大学 | Pipeline stress internal detection method based on complex stress state model |
| CN111912897A (en) * | 2020-08-11 | 2020-11-10 | 中国石油大学(北京) | Method, device and equipment for acquiring pipeline defect information and storage medium |
| CN112835109A (en) * | 2021-03-17 | 2021-05-25 | 华孚油气工程技术成都有限公司 | Pipeline weak magnetic positioning method for detector in long-distance pipeline |
| CN113701728A (en) * | 2021-07-19 | 2021-11-26 | 深圳大学 | Pipeline measuring robot |
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Application publication date: 20131030 |