CN112858583A - Treatment method for determining overproof defect-containing girth weld of oil and gas pipeline - Google Patents
Treatment method for determining overproof defect-containing girth weld of oil and gas pipeline Download PDFInfo
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- CN112858583A CN112858583A CN202110004388.2A CN202110004388A CN112858583A CN 112858583 A CN112858583 A CN 112858583A CN 202110004388 A CN202110004388 A CN 202110004388A CN 112858583 A CN112858583 A CN 112858583A
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- 235000013399 edible fruits Nutrition 0.000 claims abstract description 21
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- 239000004593 Epoxy Substances 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 8
- 238000007689 inspection Methods 0.000 claims description 6
- 230000035515 penetration Effects 0.000 claims description 4
- 238000009412 basement excavation Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
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- 239000006247 magnetic powder Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
Abstract
The invention discloses a disposal method for determining overproof defect-containing circumferential welds of an oil and gas pipeline, and belongs to the field of pipeline evaluation. A treatment method for determining that an oil and gas pipeline contains overproof defect girth welds comprises the following steps: 1) evaluating the applicability of the girth weld containing the defects, and calculating a Kr value and an Lr value through a failure evaluation curve; 2) dividing different intervals based on the size of the Kr value or Lr value; 3) dividing the area into a high fruit area and a general area based on the failure result of the circumferential weld; 4) dividing different defect types based on the defects of the circumferential weld; 5) dividing the geology into a ground disaster area and a non-ground disaster area according to the geology of the location of the oil and gas pipeline; 6) and (3) treating the oil and gas pipeline based on the Kr or Lr interval, failure consequence, defect type and geological location where the girth weld containing the defect is located. The invention overcomes the defect of incomplete consideration of the treatment of the girth weld containing the defect.
Description
Technical Field
The invention belongs to the field of pipeline evaluation, and particularly relates to a disposal method for determining overproof defect-containing circumferential welds of an oil and gas pipeline.
Background
In order to ensure the safe operation of oil and gas pipelines and thoroughly investigate the potential safety hazard of the circumferential weld of the pipelines, in recent years, a large amount of risk investigation work of the circumferential weld of the pipelines is carried out by pipeline companies. For the circumferential weld with the overproof defects, all the overproof defects cannot be maintained or replaced due to the limit of the aspects of output, investment, construction period, technology, environment and the like. The integrity evaluation is based on service applicability, is a method for screening defects, eliminates the defects which do not meet the service requirement, and is an effective method for considering both the safety and the economy of the pipeline.
The method comprises the steps of performing inner detection to check the circumferential weld to determine the position of an abnormal circumferential weld, performing comprehensive nondestructive detection (including magnetic powder, ultrasound, rays, phased arrays, TOFD and the like) on the circumferential weld through excavation detection, and judging whether the circumferential weld containing defects can meet the pipeline operation requirements through applicability evaluation if the circumferential weld containing defects exceeds the standard. Generally, the applicability evaluation is passed, which indicates that the girth weld containing the defects can safely operate under normal working conditions; if not, the circumferential weld needs to be repaired or disposed.
Whether the pipeline can normally run is determined by the existence of the hidden danger of the circumferential weld, the failure and cracking of the circumferential weld are dominated by axial stress, and the failure of the circumferential weld of the pipeline is proved by a plurality of accidents of the failure and cracking of the circumferential weld of the pipeline. The axial stress caused by the internal pressure in the pipeline is 1/2 of the hoop stress. While axial stresses are mainly due to external loads. The existing evaluation technology mainly considers the internal pressure, residual stress, additional stress and the like of the pipeline, and the external load cannot be accurately estimated. In addition, the investment for checking the girth welds is huge, and according to incomplete statistics, the cumulative number of verification of the girth welds excavated by each pipeline company reaches more than 10000 until 2020, but a large amount of manpower and material resources are required to be invested in the girth welds excavated. Therefore, after the above problems are comprehensively considered, the treatment of the girth weld with the defect is more conservative, and even if the girth weld with the defect can be evaluated through the applicability, the girth weld is expected to be repaired or treated properly through the excavation detection. Therefore, on the basis of the result of the suitability evaluation, treatment suggestion is made on the girth weld defects.
Disclosure of Invention
The invention aims to overcome the defect that the treatment consideration of the circumferential weld containing the defect is incomplete, and provides a treatment method for determining the circumferential weld containing the overproof defect of an oil and gas pipeline.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a treatment method for determining overproof defect-containing girth welds of an oil and gas pipeline comprises the following steps:
1) evaluating the applicability of the girth weld containing the defects, and calculating a Kr value and an Lr value through a failure evaluation curve;
2) dividing different intervals based on the size of the Kr value or Lr value;
3) dividing the area into a high fruit area and a general area based on the failure result of the circumferential weld;
4) dividing different defect types based on the defects of the circumferential weld;
5) dividing the geology into a ground disaster area and a non-ground disaster area according to the geology of the location of the oil and gas pipeline;
6) and (3) treating the oil and gas pipeline based on the Kr or Lr interval, failure consequence, defect type and geological location where the girth weld containing the defect is located.
Further, in the step 2), the range is divided into the following intervals according to the size of the Kr value or the Lr value;
kr value or Lr value > 0.9;
0.9 > Kr value or Lr value > 0.8;
0.8 > Kr value or Lr value > 0.7;
0.7 > Kr value or Lr value > 0.5;
the Kr value or Lr value is less than 0.5.
Further, step 4) divides the ring weld defects into cracks, root unfused/lack of penetration, and other defects.
Further, when the Kr value or the Lr value is larger than 0.9 and the defect of the circumferential weld is a crack, the oil and gas pipeline, the pipe replacement or the B-type casing pipe repair is immediately repaired;
when the Kr value or the Lr value is larger than 0.9, the B-type sleeve is repaired within 1 year when the defect of the girth weld is that the root is not fused/welded completely;
when the Kr value or the Lr value is larger than 0.9, and the defects of the girth welds are other defects, the B-type sleeve is repaired within 1 year.
Further, when the value of 0.9 & gt Kr or the value of Lr & gt 0.8 and the defect of the circumferential weld is a crack, if the crack is in a high fruit zone, the oil and gas pipeline, the pipe replacement or the B-type casing pipe repair is immediately repaired, and if the crack is in a general zone, the B-type casing pipe repair is carried out within 1 year;
when the Kr value is more than 0.9 or the Lr value is more than 0.8, and the defect of the circumferential weld is that the root is not fused/welded through, if the circumferential weld is in a disaster area of a high fruit area, the B-type sleeve is repaired within 1 year, and if the circumferential weld is in a non-disaster area of the high fruit area, the epoxy sleeve is repaired; if the area is in a general area, the epoxy casing pipe is repaired;
when the Kr value is more than 0.9 or the Lr value is more than 0.8, and the defects of the girth weld are other defects, if the high fruit area is in a disaster area, the epoxy casing pipe is repaired, and if the high fruit area is in a non-disaster area, the epoxy casing pipe is rechecked after 1 year; if the area is in a disaster area of a general area, the inspection is carried out again after 1 year, and if the area is in a non-disaster area of the general area, the inspection is carried out again after 2 years.
Further, when the Kr value is more than 0.8 or the Lr value is more than 0.7, and the defect of the circumferential weld is a crack, if the crack is in a high fruit zone, the oil-gas pipeline, the pipe replacement or the B-type casing pipe is repaired within 1 year, and if the crack is in a general zone, the oil-gas pipeline, the pipe replacement or the B-type casing pipe is repaired within 2 years;
when the value is more than 0.8 and more than Kr or the value is more than 0.7, and the defect of the circumferential weld is that the root is not fused/welded completely, if the circumferential weld is in a high fruit area, the circumferential weld is rechecked within 2 years, if the circumferential weld is in a disaster area of a general area, the circumferential weld is rechecked within 2 years, and if the circumferential weld is in a non-disaster area of the general area, the circumferential weld is rechecked along with the internal inspection period;
when the value is more than 0.8 and more than Kr or the value is more than 0.7, and the defect of the girth weld is other defects, if the defect is in a disaster area of a high fruit area, the defect is rechecked within 2 years, and if the defect is in a residual area, the defect is rechecked along with an internal detection period.
Further, when the value of 0.7 & gt Kr or the value of Lr & gt 0.5 and the defect of the circumferential weld is a crack, the circumferential weld is repaired within 2 years;
when the value of 0.7 is more than Kr or the value of Lr is more than 0.5, and the defect of the circumferential weld is that the root is not fused/welded completely, the circumferential weld is rechecked along with the internal detection period;
and when the value of 0.7 & gt Kr or the value of Lr & gt 0.5 and the defect of the girth weld is other defects, performing common crater management.
Further, when the Kr value or the Lr value is less than 0.5 and the defect of the circumferential weld is a crack, the circumferential weld is repaired within 3 years;
and when the Kr value or the Lr value is less than 0.5, and the defects of the girth weld are root unfused/incomplete penetration and other defects, performing common crater management.
Compared with the prior art, the invention has the following beneficial effects:
according to the processing method for determining the overproof defect circumferential weld of the oil and gas pipeline, the overproof defect circumferential weld of the oil and gas pipeline is processed based on multiple factors, whether the pipeline is possibly affected by external loads is determined geologically, the sizes of the overproof defect applicability evaluation result Kr value and Lr value correspond to different risks, the processing method for the overproof defect circumferential weld of the oil and gas pipeline is comprehensively determined based on different factors, and the consideration factors are more comprehensive.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that the terms first, second and the like in the description and in the claims of the present invention are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention provides a disposal method for determining the overproof defect-containing girth weld of an oil and gas pipeline, which can quickly provide a disposal suggestion for the overproof defect-containing girth weld based on the applicability evaluation result and provide a technical basis for the operation unit to adopt a targeted management measure.
Examples
Referring to table 1, table 1 is a proposed table for treating overproof defect-containing girth welds of oil and gas pipelines, and treatment modes are divided into 5 grades according to the size of Kr or Lr values, wherein the Kr or Lr values are respectively less than 0.5, >0.7, >0.8 and > 0.9; first, defects of the ring weld are classified into three major categories, respectively, cracks, root unfused/lack of penetration, and other defects, including rounding, strip, dense porosity, buried defects, internal surface open defects, and linear defects, among others. Secondly, considering the failure consequence of the girth weld, different treatment modes are adopted for the same kind of defects according to the high-back fruit area and the general area. Thirdly, considering the possibility of geological disaster, namely whether the pipeline is possibly influenced by external load, different treatment modes are adopted for the same kind of defects. Fourthly, according to the standard-exceeding defect applicability evaluation result Kr value and Lr value, respectively corresponding to a vertical coordinate and a horizontal coordinate in the girth weld failure evaluation curve graph.
It should be noted that, for the girth welds welded with a variable wall thickness, after calculating the values of Kr and Lr, the treatment method is selected from table 1 according to the factors of the defect type, the high posterior fruit region, the ground disaster region, and the like, and the influence of the variable wall thickness on the girth welds is considered, and especially the variable wall thickness girth welds are more likely to fail after being subjected to an external load, so the treatment suggestion for the variable wall thickness girth welds is raised by one level, that is, the treatment suggestion is raised vertically by one level on the basis of the original selection in table 1.
TABLE 1 oil and gas pipeline circumferential weld treatment suggestion table containing overproof defect
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (8)
1. A treatment method for determining overproof defect-containing girth welds of an oil and gas pipeline is characterized by comprising the following steps of:
1) evaluating the applicability of the girth weld containing the defects, and calculating a Kr value and an Lr value through a failure evaluation curve;
2) dividing different intervals based on the size of the Kr value or Lr value;
3) dividing the area into a high fruit area and a general area based on the failure result of the circumferential weld;
4) dividing different defect types based on the defects of the circumferential weld;
5) dividing the geology into a ground disaster area and a non-ground disaster area according to the geology of the location of the oil and gas pipeline;
6) and (3) treating the oil and gas pipeline based on the Kr or Lr interval, failure consequence, defect type and geological location where the girth weld containing the defect is located.
2. The treatment method for determining the overproof defect-containing girth weld of the oil and gas pipeline according to claim 1, wherein in the step 2), the treatment method is divided into the following intervals according to the size of Kr value or Lr value;
kr value or Lr value > 0.9;
0.9 > Kr value or Lr value > 0.8;
0.8 > Kr value or Lr value > 0.7;
0.7 > Kr value or Lr value > 0.5;
the Kr value or Lr value is less than 0.5.
3. The method of determining containment of overproof defect girth welds in oil and gas pipelines according to claim 1 or 2, wherein step 4) divides the defects of the girth welds into cracks, root unfused/unwelded and other defects.
4. The disposal method for determining the overproof defect-containing girth weld of the oil and gas pipeline according to claim 1, wherein when the Kr value or the Lr value is more than 0.9 and the defect of the girth weld is a crack, the oil and gas pipeline is immediately repaired, the pipe is replaced or the B-type casing is repaired;
when the Kr value or the Lr value is larger than 0.9, the B-type sleeve is repaired within 1 year when the defect of the girth weld is that the root is not fused/welded completely;
when the Kr value or the Lr value is larger than 0.9, and the defects of the girth welds are other defects, the B-type sleeve is repaired within 1 year.
5. The disposal method for determining the overproof defect-containing girth weld of the oil and gas pipeline according to claim 1, wherein when the value of 0.9 & gt Kr or the value of Lr & gt 0.8 and the defect of the girth weld is a crack, if the defect is in a high fruit zone, the oil and gas pipeline is immediately repaired, the pipe is replaced or the B-type casing is repaired, and if the defect is in a general zone, the B-type casing is repaired within 1 year;
when the Kr value is more than 0.9 or the Lr value is more than 0.8, and the defect of the circumferential weld is that the root is not fused/welded through, if the circumferential weld is in a disaster area of a high fruit area, the B-type sleeve is repaired within 1 year, and if the circumferential weld is in a non-disaster area of the high fruit area, the epoxy sleeve is repaired; if the area is in a general area, the epoxy casing pipe is repaired;
when the Kr value is more than 0.9 or the Lr value is more than 0.8, and the defects of the girth weld are other defects, if the high fruit area is in a disaster area, the epoxy casing pipe is repaired, and if the high fruit area is in a non-disaster area, the epoxy casing pipe is rechecked after 1 year; if the area is in a disaster area of a general area, the inspection is carried out again after 1 year, and if the area is in a non-disaster area of the general area, the inspection is carried out again after 2 years.
6. The disposal method for determining the overproof defect-containing girth weld of the oil and gas pipeline according to claim 1, wherein when the Kr value is more than 0.8 or the Lr value is more than 0.7 and the defect of the girth weld is a crack, if the defect is in a high fruit zone, the oil and gas pipeline, the pipe replacement or the B-type casing pipe is repaired within 1 year, and if the defect is in a general area, the oil and gas pipeline, the pipe replacement or the B-type casing pipe is repaired within 2 years;
when the value is more than 0.8 and more than Kr or the value is more than 0.7, and the defect of the circumferential weld is that the root is not fused/welded completely, if the circumferential weld is in a high fruit area, the circumferential weld is rechecked within 2 years, if the circumferential weld is in a disaster area of a general area, the circumferential weld is rechecked within 2 years, and if the circumferential weld is in a non-disaster area of the general area, the circumferential weld is rechecked along with the internal inspection period;
when the value is more than 0.8 and more than Kr or the value is more than 0.7, and the defect of the girth weld is other defects, if the defect is in a disaster area of a high fruit area, the defect is rechecked within 2 years, and if the defect is in a residual area, the defect is rechecked along with an internal detection period.
7. The disposal method for determining overproof defect-containing girth welds of oil and gas pipelines according to claim 1, characterized in that when 0.7 > Kr value or Lr value >0.5, the defects of the girth welds are cracks, the girth welds are repaired within 2 years;
when the value of 0.7 is more than Kr or the value of Lr is more than 0.5, and the defect of the circumferential weld is that the root is not fused/welded completely, the circumferential weld is rechecked along with the internal detection period;
and when the value of 0.7 & gt Kr or the value of Lr & gt 0.5 and the defect of the girth weld is other defects, performing common crater management.
8. The disposal method for determining the overproof defect-containing girth weld of the oil and gas pipeline according to claim 1, wherein when the Kr value or the Lr value is less than 0.5 and the defect of the girth weld is a crack, the girth weld is repaired within 3 years;
and when the Kr value or the Lr value is less than 0.5, and the defects of the girth weld are root unfused/incomplete penetration and other defects, performing common crater management.
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| CN202110004388.2A CN112858583A (en) | 2021-01-04 | 2021-01-04 | Treatment method for determining overproof defect-containing girth weld of oil and gas pipeline |
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| CN202110004388.2A CN112858583A (en) | 2021-01-04 | 2021-01-04 | Treatment method for determining overproof defect-containing girth weld of oil and gas pipeline |
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| CN102661892A (en) * | 2012-05-29 | 2012-09-12 | 南京工业大学 | Quantitative risk analyzing method for pressure equipment with embed crack defect |
| CN107283083A (en) * | 2016-03-31 | 2017-10-24 | 中国石油天然气股份有限公司 | Girth joint evaluation method and device |
| CN109781754A (en) * | 2019-01-10 | 2019-05-21 | 中国石油天然气集团有限公司 | A kind of pipeline girth weld defect safe evaluation method |
-
2021
- 2021-01-04 CN CN202110004388.2A patent/CN112858583A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102661892A (en) * | 2012-05-29 | 2012-09-12 | 南京工业大学 | Quantitative risk analyzing method for pressure equipment with embed crack defect |
| CN107283083A (en) * | 2016-03-31 | 2017-10-24 | 中国石油天然气股份有限公司 | Girth joint evaluation method and device |
| CN109781754A (en) * | 2019-01-10 | 2019-05-21 | 中国石油天然气集团有限公司 | A kind of pipeline girth weld defect safe evaluation method |
Non-Patent Citations (1)
| Title |
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| 冼国栋等: "油气管道环焊缝缺陷排查及处置措施研究", 《石油管材与仪器》 * |
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