CN103308592A - Detection method of newly built oil-gas pipeline - Google Patents
Detection method of newly built oil-gas pipeline Download PDFInfo
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- CN103308592A CN103308592A CN2012100715931A CN201210071593A CN103308592A CN 103308592 A CN103308592 A CN 103308592A CN 2012100715931 A CN2012100715931 A CN 2012100715931A CN 201210071593 A CN201210071593 A CN 201210071593A CN 103308592 A CN103308592 A CN 103308592A
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Abstract
The invention discloses a detection method of a newly built oil-gas pipeline, and belongs to the field of petroleum. The method comprises the following steps as shown in the specification. According to the embodiment of the invention, a weak magnetic internal detection device of a long oil-gas conveying pipeline is applied for detecting pipeline stress central areas before and after pipeline pressure testing, and defects of the pipeline stress central areas are detected through detecting the stress release conditions before and after pressure testing; defects in the stress central areas before pipelines are put into operation are detected effectively; the long-time safety running of pipelines is ensured; the detection problems of the pipeline stress central areas are solved. The detection method of the newly built oil-gas pipeline provided by the invention provides a scientific basis for pipeline evaluation further, and is a standard and brand new detection and evaluation method for the supplement of pressure testing.
Description
Technical field
The present invention relates to oil field, particularly a kind of detection method of newly-built oil and gas pipes, the method are based on detection method in the weak magnetic of region of stress concentration, the safety evaluation before being applicable to the oil and gas pipes construction and going into operation afterwards.
Background technology
At present, the detection method of newly-built oil and gas pipes is existing national and foreign standards method, it all by a certain percentage allowable pressure be that pressure test pressure is checked for the last time to the pipeline before going into operation, booster will occur in the pipeline section that does not reach index, investigate thus underproof pipeline section.
But may be in the critical point of allowable pressure through the concentrated area that can't discharge stress after the pressure testing, the conduit running booster that just can lose efficacy during to the fatigue phase so above-mentioned detection method can't clear and definite stress defective, has been buried potential safety hazard to operation.
Summary of the invention
Can't clear and definite stress defective in order to overcome detection method of the prior art, buried the problem of potential safety hazard to operation, the embodiment of the invention provides a kind of detection method of newly-built oil and gas pipes.Described technical scheme is as follows:
A kind of detection method of newly-built oil and gas pipes operates in accordance with the following steps:
Step 100, after newly-built oil and gas pipes connects, pick-up unit in the magnetic a little less than the long oil and gas pipeline is made the isolation rabbit of described mail oil and gas pipes water filling pressure testing, water flood operations promotes the interior pick-up unit of the weak magnetic of described long oil and gas pipeline and moves in described newly-built oil and gas pipes, carry out the weak magnetic of pipeline and detect, and obtain the pipe detection result;
Step 200, step 100 water filling finishes, and pick-up unit detects simultaneously and finishes in the weak magnetic of long oil and gas pipeline, at this moment presses the standard schedule applied voltage test, if generation problem in the water pressure testing process after traditional rules processing, repeats said process, until pressure testing is normal;
Step 300, pick-up unit in the magnetic a little less than the described long oil and gas pipeline is made the isolation rabbit to be sent out into described newly-built oil and gas pipes, promoting a little less than the described long oil and gas pipeline in the magnetic pick-up unit with pressure-air releases the pressure testing water in the described newly-built oil and gas pipes, the weak magnetic of finishing simultaneously described newly-built oil and gas pipes detects, and obtains the pipe detection result;
Step 400 is compared the pipe detection result of step 100 acquisition and the pipe detection result of step 300 acquisition, differentiates one by one the type of area of stress concentration signal, determines to affect the stress area of pipe safety, rejects according to this defective pipeline section.
Particularly, the testing result that obtains in the step 100 comprises:
(1) the thermal stress concentration zones signal of the girth joint during pipe-line construction,
(2) the region of stress concentration signal of the spiral weld of manufacturing pipe process,
(3) the region of stress concentration signal in the manufacture process of pipeline mother metal,
(4) the formed region of stress concentration signal of defective in pipeline mother metal or the welding processing process.
Particularly, the testing result that obtains in the described step 300 comprises:
(1) ' the thermal stress concentration zones signal of the girth joint during pipe-line construction,
(2) ' the region of stress concentration signal of the spiral weld of manufacturing pipe process,
(3) ' the region of stress concentration signal in the manufacture process of pipeline mother metal,
(4) ' the formed region of stress concentration signal of defective in pipeline mother metal or the welding processing process,
(5) in the pressure testing process because the area of stress concentration defective that pipeline mother metal defective such as interlayer, crackle, mechanical damage etc. form in pressure process.
Particularly, by the secondary detection Data Comparison, analyze the type that obtains the area of stress concentration signal in the step 400:
Described (1), (2) and (3) class stress signal will be owing to stress in water pressure testing process will discharge, and stress signal reduces greatly, and this is the normal attribute of steel, does not affect conduit running safety,
Described (4) class stress signal because be because the defective of steel own due to, so stress will can not discharge in the water pressure testing process, thus so that the area of stress concentration signal intensity is less,
Described (5) class stress signal is because defect of pipeline forms, although do not reach the situation of booster, has formed safety hazard, is in criticality, is the new region of stress concentration that forms in pressure testing owing to defect of pipeline,
Thus, can differentiate the type of area of stress concentration signal on the secondary detection result, determine that described (4) and (5) class stress area is to affect pipe safety.
Particularly, in the described step 100, the detection travelling speed by pick-up unit in the magnetic a little less than the long oil and gas pipeline of control water injection rate control wherein, detects travelling speed and is controlled in the 0.35-1.5 meter per second scope,
In the described step 300, by the travelling speed of pick-up unit in the magnetic a little less than the long oil and gas pipeline of control water discharge control, wherein, detection speed is controlled in the 0.35-1.5 meter per second scope equally.
The beneficial effect that the technical scheme that the embodiment of the invention provides is brought is: compared to existing technology, the embodiment of the invention is used the interior pick-up unit of the weak magnetic of long oil and gas pipeline newly-built long oil and gas pipeline is carried out the area of stress concentration defects detection, by the concentrated area before and after the pressure testing is detected, clear and definite stress defective, improve the safety of conduit running, solved pipe stress concentrated area test problems, further evaluation provides scientific basis to pipeline in the present invention, is a kind of brand-new method of determination and evaluation of additional pressure testing standard.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below embodiment of the present invention is described further in detail.
A kind of detection method of newly-built oil and gas pipes operates in accordance with the following steps:
Step 100, after newly-built oil and gas pipes connects, pick-up unit in the magnetic a little less than the long oil and gas pipeline is made the isolation rabbit of described mail oil and gas pipes water filling pressure testing, water flood operations promotes the interior pick-up unit of the weak magnetic of described long oil and gas pipeline and moves in described newly-built oil and gas pipes, carrying out the weak magnetic of pipeline detects, and acquisition pipe detection result
Particularly, by the detection travelling speed of pick-up unit in the weak magnetic of the long oil and gas pipeline of control water injection rate control, wherein, detect travelling speed and be controlled in the 0.35-1.5 meter per second scope in the described step 100,
After pushing away the water end, the weak magnetic of pipeline detects and finishes simultaneously, and particularly, the testing result that obtains in the step 100 comprises:
(1) the thermal stress concentration zones signal of the girth joint during pipe-line construction,
(2) the region of stress concentration signal of the spiral weld of manufacturing pipe process,
(3) the region of stress concentration signal in the manufacture process of pipeline mother metal,
(4) the formed region of stress concentration signal of defective in pipeline mother metal or the welding processing process;
Step 200, step 100 water filling finishes, and pick-up unit detects simultaneously and finishes in the weak magnetic of long oil and gas pipeline, at this moment carries out applied voltage test, if generation problem in the water pressure testing process after the repair process, repeats said process, until pressure testing is normal;
Step 300, pick-up unit in the magnetic a little less than the described long oil and gas pipeline is made the isolation rabbit to be sent out into described newly-built oil and gas pipes, promoting a little less than the described long oil and gas pipeline in the magnetic pick-up unit with pressure-air releases the pressure testing water in the described newly-built oil and gas pipes, the weak magnetic of finishing simultaneously described newly-built oil and gas pipes detects, and acquisition pipe detection result
In the described step 300, by the travelling speed of pick-up unit in the magnetic a little less than the long oil and gas pipeline of control water discharge control, wherein, detection speed is controlled in the 0.35-1.5 meter per second scope equally.
Particularly, the testing result that obtains in the described step 300 comprises:
(1) ' the thermal stress concentration zones signal of the girth joint during pipe-line construction,
(2) ' the region of stress concentration signal of the spiral weld of manufacturing pipe process,
(3) ' the region of stress concentration signal in the manufacture process of pipeline mother metal,
(4) ' the formed region of stress concentration signal of defective in pipeline mother metal or the welding processing process,
(5) in the pressure testing process because the area of stress concentration defective that pipeline mother metal defective such as interlayer, crackle, mechanical damage etc. form in pressure process;
Step 400 is compared the pipe detection result of step 100 acquisition and the pipe detection result of step 300 acquisition, differentiates one by one the type of area of stress concentration signal, determines to affect the stress area of pipe safety, rejects according to this defective pipeline section,
Particularly, by the secondary detection Data Comparison, analyze the type that obtains the area of stress concentration signal in the step 400:
Described (1), (2) and (3) class stress signal will be owing to stress in water pressure testing process will discharge, and stress signal reduces greatly, and this is the normal attribute of steel, does not affect conduit running safety,
Described (4) class stress signal because be because the defective of steel own due to, so stress will can not discharge in the water pressure testing process, thus so that the area of stress concentration signal intensity is less,
Described (5) class stress signal is because defect of pipeline forms, although do not reach the situation of booster, has formed safety hazard, is in criticality, is the new region of stress concentration that forms in pressure testing owing to defect of pipeline,
Thus, can differentiate the type of area of stress concentration signal on the secondary detection result, determine that described (4) and (5) class stress area is to affect pipe safety.
The embodiment of the invention is used pick-up unit in the weak magnetic of long oil and gas pipeline, before and after pipeline pressure test, carry out respectively the detection of pipe stress concentrated area, by detecting the situation of pressure testing front and back stress relief, carry out the detection of pipe stress concentration zones defective, realize put into operation effective detection of front area of stress concentration defective of pipeline, ensure the long-term safety operation of pipeline.
In addition, the present invention successfully is used for pick-up unit in the weak magnetic of long oil and gas pipeline, and result of use is good, has been successfully completed type approval test.
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 (5)
1. the detection method of a newly-built oil and gas pipes is characterized in that, operates in accordance with the following steps:
Step 100, after newly-built oil and gas pipes connects, pick-up unit in the magnetic a little less than the long oil and gas pipeline is made the isolation rabbit of described mail oil and gas pipes water filling pressure testing, water flood operations promotes the interior pick-up unit of the weak magnetic of described long oil and gas pipeline and moves in described newly-built oil and gas pipes, carry out the weak magnetic of pipeline and detect, and obtain the pipe detection result;
Step 200, step 100 water filling finishes, and pick-up unit detects simultaneously and finishes in the weak magnetic of long oil and gas pipeline, at this moment presses the standard schedule applied voltage test, if generation problem in the water pressure testing process after traditional rules processing, repeats said process, until pressure testing is normal;
Step 300, pick-up unit in the magnetic a little less than the described long oil and gas pipeline is made the isolation rabbit to be sent out into described newly-built oil and gas pipes, promoting a little less than the described long oil and gas pipeline in the magnetic pick-up unit with pressure-air releases the pressure testing water in the described newly-built oil and gas pipes, the weak magnetic of finishing simultaneously described newly-built oil and gas pipes detects, and obtains the pipe detection result;
Step 400 is compared the pipe detection result of step 100 acquisition and the pipe detection result of step 300 acquisition, differentiates one by one the type of area of stress concentration signal, determines to affect the stress area of pipe safety, rejects according to this defective pipeline section.
2. the detection method of newly-built oil and gas pipes as claimed in claim 1 is characterized in that, the testing result that obtains in the step 100 comprises:
(1) the thermal stress concentration zones signal of the girth joint during pipe-line construction,
(2) the region of stress concentration signal of the spiral weld of manufacturing pipe process,
(3) the region of stress concentration signal in the manufacture process of pipeline mother metal,
(4) the formed region of stress concentration signal of defective in pipeline mother metal or the welding processing process.
3. the detection method of newly-built oil and gas pipes as claimed in claim 2 is characterized in that, the testing result that obtains in the described step 300 comprises:
(1) ' the thermal stress concentration zones signal of the girth joint during pipe-line construction,
(2) ' the region of stress concentration signal of the spiral weld of manufacturing pipe process,
(3) ' the region of stress concentration signal in the manufacture process of pipeline mother metal,
(4) ' the formed region of stress concentration signal of defective in pipeline mother metal or the welding processing process,
(5) in the pressure testing process because the area of stress concentration defective that pipeline mother metal defective such as interlayer, crackle, mechanical damage etc. form in pressure process.
4. the detection method of newly-built oil and gas pipes as claimed in claim 3 is characterized in that, by the secondary detection Data Comparison, analyzes the type that obtains the area of stress concentration signal in the step 400:
Described (1), (2) and (3) class stress signal will be owing to stress in water pressure testing process will discharge, and stress signal reduces greatly, and this is the normal attribute of steel, does not affect conduit running safety,
Described (4) class stress signal because be because the defective of steel own due to, so stress will can not discharge in the water pressure testing process, thus so that the area of stress concentration signal intensity is less,
Described (5) class stress signal is because defect of pipeline forms, although do not reach the situation of booster, has formed safety hazard, is in criticality, is the new region of stress concentration that forms in pressure testing owing to defect of pipeline,
Thus, can differentiate the type of area of stress concentration signal on the secondary detection result, determine that described (4) and (5) class stress area is to affect pipe safety.
5. the detection method of newly-built oil and gas pipes as claimed in claim 4 is characterized in that,
In the described step 100, the detection travelling speed by pick-up unit in the magnetic a little less than the long oil and gas pipeline of control water injection rate control wherein, detects travelling speed and is controlled in the 0.35-1.5 meter per second scope,
In the described step 300, by the travelling speed of pick-up unit in the magnetic a little less than the long oil and gas pipeline of control water discharge control, wherein, detection speed is controlled in the 0.35-1.5 meter per second scope equally.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210071593.1A CN103308592B (en) | 2012-03-16 | 2012-03-16 | A kind of detection method of newly-built oil and gas pipes |
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| CN201210071593.1A CN103308592B (en) | 2012-03-16 | 2012-03-16 | A kind of detection method of newly-built oil and gas pipes |
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| CN103308592A true CN103308592A (en) | 2013-09-18 |
| CN103308592B CN103308592B (en) | 2016-04-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| CN1793894A (en) * | 2005-12-06 | 2006-06-28 | 天津大学 | Method of determining pipeline welding crack stress concentration using metal magnetic memory detection technology |
| CN1793895A (en) * | 2005-12-06 | 2006-06-28 | 天津大学 | Method of diagnosing pipeline welding crack using metal magnetic memory detecting signal |
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2012
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Patent Citations (5)
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| US3539915A (en) * | 1967-11-03 | 1970-11-10 | American Mach & Foundry | Pipeline inspection apparatus for detection of longitudinal defects by flux leakage inspection of circumferential magnetic field |
| US5532587A (en) * | 1991-12-16 | 1996-07-02 | Vetco Pipeline Services, Inc. | Magnetic field analysis method and apparatus for determining stress characteristics in a pipeline |
| CN1793894A (en) * | 2005-12-06 | 2006-06-28 | 天津大学 | Method of determining pipeline welding crack stress concentration using metal magnetic memory detection technology |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| CN103308592B (en) | 2016-04-06 |
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Effective date of registration: 20211105 Address after: Room 08-10, 6 / F, block a, No. 5, Dongtucheng Road, Chaoyang District, Beijing 100013 Patentee after: National Petroleum and natural gas pipeline network Group Co.,Ltd. Address before: 100007 Oil Mansion, 9 North Avenue, Dongcheng District, Beijing, Dongzhimen Patentee before: PETROCHINA Co.,Ltd. |
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