CN103470914B - Joint coating method applicable to thickened erosion-resistant layers of directionally drilled and crossed pipelines - Google Patents
Joint coating method applicable to thickened erosion-resistant layers of directionally drilled and crossed pipelines Download PDFInfo
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- CN103470914B CN103470914B CN201310375712.7A CN201310375712A CN103470914B CN 103470914 B CN103470914 B CN 103470914B CN 201310375712 A CN201310375712 A CN 201310375712A CN 103470914 B CN103470914 B CN 103470914B
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Abstract
The invention discloses a joint coating method applicable to thickened erosion-resistant layers of directionally drilled and crossed pipelines. The joint coating method includes reserving a pipe end with the length of 100-150mm on an erosion-resistant layer; selectively utilizing a narrow polyethylene thermal shrinkage band as a first joint coating construction layer; selectively utilizing a special directional drilling polyethylene thermal shrinkage band as a second joint coating construction layer; utilizing a special directional drilling polyethylene sacrificial band as a third joint coating construction layer in the advancing direction for dragging back a directionally drilled and crossed pipeline. The thickness of the narrow polyethylene thermal shrinkage band is 2.5mm, and the width of the narrow polyethylene thermal shrinkage band is equal to the reserved length of the pipe end after the narrow polyethylene thermal shrinkage band is shrunk. The thickness of the special directional drilling polyethylene thermal shrinkage band ranges from 2.8mm to 3.1mm before the special directional drilling polyethylene thermal shrinkage band is shrunk, and the width of the special directional drilling polyethylene thermal shrinkage band ranges from 520mm to 600mm after the special directional drilling polyethylene thermal shrinkage band is shrunk. The thickness of a single side of the special directional drilling polyethylene sacrificial band is increased and is 2.8mm, and the width of the special directional drilling polyethylene sacrificial band is 300mm after the special directional drilling polyethylene sacrificial band is shrunk. The joint coating method has the advantages that the completeness of the erosion-resistant layers of directionally drilled and crossed sections of the pipelines can be improved advantageously, and weak links of joint coated positions are protected; water vapor channels can be effectively prevented by multi-layer staggered joint structures, the service life can be prolonged, and the scratch resistance and the tensile strength can be improved.
Description
Technical field
The present invention relates to a kind of method of construction, especially relate to the field joint construction new method that a kind of petroleum-gas pipeline engineering directional drilling crossing pipeline thickeies anticorrosive coat.
Background technique
At present, in petroleum-gas pipeline engineering at home, directional drilling crossing technology is used widely, is not only applied to River Crossing section, is also applied to the Special zone such as massif, highway, railway crossing.Due to geological condition, working measure is lack of standardization and lack the reasons such as effective measures to pipeline anticorrosion coating protection, causes through section pipeline anticorrosion coating degree of impairment frequent all the more.Different from general cable tubing, after Directional Drilling for Pipeline Crossing completes pipeline will for a long time buried in soil, can not excavate, the pipeline anticorrosion coating breakage formed in construction almost cannot be repaired, and the long-term safety of pipeline is run to the hidden danger leaving unrepairable.
In recent years, for strengthening directional drilling crossing pipeline anticorrosion coating integrity, the multiple technological scheme targetedly of domestic appearance.Carrying out directional drilling crossing pipeline three-decker polyethylene anticorrosive coating thickening (as the 3.7mm from conventional design is increased to 6mm) is exactly wherein a kind of scheme.For thickening later directional drilling crossing pipeline anticorrosion coating, the present invention is comprehensive field joint construction new method for it.
Summary of the invention
In order to overcome the above-mentioned shortcoming of prior art, the invention provides a kind of jointing method being applicable to directional drilling crossing pipeline thickening anticorrosive coat, on the basis of gas pipeline conventional polyvinyl shrink belt jointing method, for the caducous present situation of joint coating on pipeline part anticorrosive coat in directional drilling crossing process, the feature of anticorrosive coat is thickeied in conjunction with pipeline, propose a kind of jointing method being applicable to directional drilling crossing pipeline thickening anticorrosive coat, be conducive to the integrity improving directional drilling crossing segment pipe anticorrosive coat, be applicable to Gas Pipeline Project directional drilling crossing section anticorrosive coat working design.
The technical solution adopted for the present invention to solve the technical problems is: a kind of jointing method being applicable to directional drilling crossing pipeline thickening anticorrosive coat, comprises the steps:
The first step, anticorrosive coat pipe end are reserved:
It is 100 ~ 150mm that directional drilling crossing pipeline thickeies anticorrosive coat pipe end length in reserve, and the polyethylene layer end face after process forms the chamfering being less than or equal to 30 °; Two pipe ends corresponding to weld joint add up to length in reserve to be 200 ~ 300mm;
Second step, narrow polyethylene thermal contraction strap fill construction:
According to the pre-allowance of anticorrosive coat pipe end that the first step is determined, select thickness to be 2.5mm, shrink the first layer of narrow polyethylene thermal contraction strap as field joint construction that rear width equals anticorrosive coat pipe end length in reserve in the first step;
The special polyethylene thermal contraction strap construction of 3rd step, Directional Drilling:
According to the pre-allowance of anticorrosive coat pipe end that the first step is determined, select thickness before shrinking to be 2.8 ~ 3.1mm, shrink the second layer of the special polyethylene thermal contraction strap of Directional Drilling as field joint construction that rear width is 520 ~ 600mm;
4th step, sacrificial band are constructed:
After completing the 3rd step construction, in the direction of advance of directional drilling crossing pipeline returning, one-sided increase thickness is 2.8mm, shrinks the third layer of the special polyethylene sacrificial band of Directional Drilling as field joint construction that rear width is 300mm.
Compared with prior art, good effect of the present invention is: according to the thickness of straight length pipe main body anticorrosive coat, designs a kind of unconventional pipeline anticorrosion coating repaired mouth structure.Pipeline anticorrosion coating repaired mouth total structure thickness, a little less than straight length main body anticorrosive coat, relies on the protection of straight length main body anticorrosive coat, repaired mouth position anticorrosive coat is depressed under construction pull-back force damage surface, is conducive to protection repaired mouth position weak link.
And multilayer fissure of displacement structure effectively can stop the formation of vapor channel, improves integrally-built integrity and working life; The special polyethylene thermal contraction strap of Directional Drilling of outer high strength, as the support of total, ensures the intensity of repaired mouth position anticorrosive coat, and raising damage resistant, tension take off performance.
Accompanying drawing explanation
Examples of the present invention will be described by way of reference to the accompanying drawings, wherein:
Fig. 1 is directional drilling crossing section repaired mouth structural representation.
Embodiment
As shown in Figure 1, a kind of jointing method being applicable to directional drilling crossing pipeline thickening anticorrosive coat, directional drilling crossing pipeline adopts and thickeies anticorrosive coat (i.e. three-decker polyethylene anticorrosive coating), and concrete steps are as follows:
The first step, anticorrosive coat pipe end are reserved:
It is that 100 ~ 150mm(recommends 150mm that directional drilling crossing pipeline thickeies anticorrosive coat 1 pipe end length in reserve (steel pipe exposed part)), the polyethylene layer end face after process should form the chamfering being less than or equal to 30 °.Two pipe ends of weld joint 5 correspondence add up to length in reserve to be that 200 ~ 300mm(recommends 300mm).
Second step, narrow polyethylene thermal contraction strap fill construction:
According to the pre-allowance of anticorrosive coat pipe end that the first step is determined, select thickness to be 2.5mm, shrink the first layer of narrow polyethylene thermal contraction strap 2 as field joint construction that rear width equals anticorrosive coat pipe end length in reserve in the first step.The Specific construction step of narrow polyethylene thermal contraction strap is as follows:
(1) steel tube surface process:
Steel tube surface derusting grade should reach the Sa21/2 level that GB/T8923.1 specifies.
(2) pipeline preheating:
Preheating temperature is controlled by the requirement of the product descritption of narrow polyethylene thermal contraction strap.The upper and lower temperature limit of preheating temperature when each manufacturer all specifies its product constructing operation.If preheating temperature is too low, the curing reaction being unfavorable for priming paint completely and with the bonding composite effect of hot melt adhesive; If preheating temperature is too high, the curing reaction of priming paint can be accelerated again, cause installation shrink belt before priming paint surface drying even do solid work or solidify, the active reaction of priming paint and hot melt adhesive can not be ensured, greatly reduce the cohesive force of shrink belt.
(3) prime:
By the requirement allotment also even brushwork epoxy resin priming paint of the products instruction of narrow polyethylene thermal contraction strap, its thickness of wet film is more than or equal to 120 μm.Epoxy resin primer can improve the adhesive property of shrink belt to steel pipe greatly, and complete, uniform priming paint possesses certain antiseptic property for steel pipe.Epoxy primer is as last one barrier of pipeline anticorrosion, and necessary effective thickness (>=120 μm) and even compact can strengthen shrink belt repaired mouth reliability of structure.
(4) heat shrink:
Use fired heater slowly to heat, in the middle of narrow polyethylene thermal contraction strap, circumferentially heat, be fitted in pipe surface completely to narrow polyethylene thermal contraction strap.The fusing situation (check the mobility of glue by finger-press method, finger indentation should disappear automatically) checking hot melt adhesive should be noted in bake process, guarantee the baking quality of whole repaired mouth.
This layer of Main Function fills with concave surface, and for making the smooth transition of the second layer of field joint construction, narrow polyethylene thermal contraction strap 2 and pipeline thicken anticorrosive coat 1 and do not overlap.
(5) tempering:
After narrow polyethylene thermal contraction strap homogeneous heating has shunk, a tempering can be carried out, again heat one time (about 2 ~ 3 minutes) by whole shrink belt.Make the abundant melting of hot melt adhesive and overflow from two ends.Discharge bubble with pressure roller simultaneously, and confirm that hot melt adhesive is fully melted with finger pressure.Tempering significantly can promote the bonding peeling strength between polyethylene thermal contraction strap and pipeline.
The special polyethylene thermal contraction strap construction of 3rd step, Directional Drilling:
According to the pre-allowance of anticorrosive coat pipe end that the first step is determined, select thickness before shrinking to be that 2.8 ~ 3.1mm(recommends 3.05mm), shrink after width be that 520 ~ 600mm(recommends 600mm) the special polyethylene thermal contraction strap 3 of Directional Drilling as the second layer of field joint construction.The Specific construction step of the special polyethylene thermal contraction strap of Directional Drilling is as follows:
(1) heating of end upsetting anticorrosive coat and hacking:
This layer without the need to brushwork epoxy resin priming paint, but need heat and plucking the thickening anticorrosive coat PE surface of pipe end.Under the condition of not priming, contraction bands to increase with polyethylene layer preheating temperature the cohesive force of PE and increases, and suitably improves preheating temperature and is conducive to improving the shrink belt repaired mouth of not priming to the peeling strength of PE anticorrosive coat.Recommendation flame heats, and temperature is higher than 75 DEG C.
Anticorrosive coat hacking object improves the wellability of hot melt adhesive at polyethylene surface, increases anticorrosive coat surface and the reactivity of hot melt adhesive, improve the cohesive force of repaired mouth layer and body anticorrosive coat.Hacking mode pulls on anticorrosive coat surface for using wire brush by hand, and there is certain roughness on surface.
(2) heat shrink:
Use fired heater slowly to heat, from the middle of the special polyethylene thermal contraction strap 3 of Directional Drilling, circumferentially heat, be fitted in pipe surface completely to the special polyethylene thermal contraction strap 3 of Directional Drilling.The fusing situation (check the mobility of glue by finger-press method, finger indentation should disappear automatically) checking hot melt adhesive should be noted in bake process, guarantee the baking quality of whole repaired mouth.
For ensureing the integral waterproofing sealability of repaired mouth structure, the special polyethylene thermal contraction strap 3 of Directional Drilling thickeies anticorrosive coat 1 bilateral with pipeline and overlaps, and every side lap width is more than or equal to 100mm.
(3) tempering:
After Directional Drilling special polyethylene thermal contraction strap 3 homogeneous heating has shunk, a tempering can be carried out, again heat one time (about 2 ~ 3 minutes) by whole shrink belt.Make the abundant melting of hot melt adhesive and overflow from two ends.Discharge bubble with pressure roller simultaneously, and confirm that hot melt adhesive is fully melted with finger pressure.Tempering significantly can promote the bonding peeling strength between polyethylene thermal contraction strap and pipeline.
4th step, sacrificial band are constructed:
After completing the 3rd step construction, in the direction of advance of directional drilling crossing pipeline returning, one-sided increase thickness is 2.8mm, shrinks the third layer of the special polyethylene sacrificial band 4 of Directional Drilling as field joint construction that rear width is 300mm.The Specific construction step of Directional Drilling special polyethylene sacrificial band is as follows:
(1) end upsetting anticorrosive coat hacking:
This layer without the need to brushwork epoxy resin priming paint, but need heat and plucking the thickening anticorrosive coat PE surface of pipe end, and technical requirements is with the end upsetting anticorrosive coat hacking method of the 3rd step.
(2) heat shrink:
The heat shrink method of same 3rd step of heat shrink technical requirements of the special polyethylene sacrificial band of Directional Drilling.
The destroying infection of friction stripping to main repaired mouth layer (the special polyethylene thermal contraction strap 3 of Directional Drilling) in journey is pulled through for resisting back, Directional Drilling special polyethylene sacrificial band 4 and Directional Drilling special polyethylene thermal contraction strap 3 lap width are 100mm, and it is 200mm that the special polyethylene sacrificial band 4 of Directional Drilling thickeies anticorrosive coat 1 lap width with pipeline.
(3) tempering:
The tempering technology of the special polyethylene sacrificial band of Directional Drilling requires the tempering with the 3rd step.
Claims (9)
1. be applicable to the jointing method that directional drilling crossing pipeline thickeies anticorrosive coat, it is characterized in that: comprise the steps:
The first step, anticorrosive coat pipe end are reserved:
It is 100 ~ 150mm that directional drilling crossing pipeline thickeies anticorrosive coat pipe end length in reserve, and the polyethylene layer end face after process forms the chamfering being less than or equal to 30 °; Two pipe ends corresponding to weld joint add up to length in reserve to be 200 ~ 300mm;
Second step, narrow polyethylene thermal contraction strap fill construction:
According to the pre-allowance of anticorrosive coat pipe end that the first step is determined, select thickness to be 2.5mm, shrink the first layer of narrow polyethylene thermal contraction strap as field joint construction that rear width equals anticorrosive coat pipe end length in reserve in the first step;
The special polyethylene thermal contraction strap construction of 3rd step, Directional Drilling:
According to the pre-allowance of anticorrosive coat pipe end that the first step is determined, select thickness before shrinking to be 2.8 ~ 3.1mm, shrink the second layer of the special polyethylene thermal contraction strap of Directional Drilling as field joint construction that rear width is 520 ~ 600mm;
4th step, sacrificial band are constructed:
After completing the 3rd step construction, in the direction of advance of directional drilling crossing pipeline returning, one-sided increase thickness is 2.8mm, shrinks the third layer of the special polyethylene sacrificial band of Directional Drilling as field joint construction that rear width is 300mm.
2. a kind of jointing method being applicable to directional drilling crossing pipeline thickening anticorrosive coat according to claim 1, is characterized in that: the Specific construction step of the narrow polyethylene thermal contraction strap described in second step is as follows:
(1) steel tube surface process:
Steel tube surface derusting grade reaches the Sa21/2 level that GB/T8923.1 specifies;
(2) pipeline preheating:
Preheating temperature is controlled in the upper and lower limit preheating temperature that specifies at narrow polyethylene thermal contraction strap product descritption;
(3) prime:
By the requirement allotment also even brushwork epoxy resin priming paint of the products instruction of narrow polyethylene thermal contraction strap, thickness of wet film is more than or equal to 120 μm;
(4) heat shrink:
Use fired heater slowly to heat, in the middle of narrow polyethylene thermal contraction strap, circumferentially heat, until narrow polyethylene thermal contraction strap is fitted in pipe surface completely.
3. a kind of jointing method being applicable to directional drilling crossing pipeline thickening anticorrosive coat according to claim 2, it is characterized in that: after narrow polyethylene thermal contraction strap heat shrink completes, carry out a tempering again, tempering heating time is 2 ~ 3 minutes, makes the abundant melting of hot melt adhesive and overflows from two ends; Discharge bubble with pressure roller simultaneously, and confirm that hot melt adhesive is fully melted with finger pressure.
4. a kind of jointing method being applicable to directional drilling crossing pipeline thickening anticorrosive coat according to claim 1, is characterized in that: the Specific construction step of the special polyethylene thermal contraction strap of Directional Drilling described in the 3rd step is as follows:
(1) heating of end upsetting anticorrosive coat and hacking:
Use the thickening anticorrosive coat PE surface of flame to pipe end to heat, heating-up temperature is higher than 75 DEG C; Adopt the manual mode using wire brush to pull on anticorrosive coat surface to carry out hired roughneck, make anticorrosive coat surface have roughness;
(2) heat shrink:
Use fired heater slowly to heat, from the middle of the special polyethylene thermal contraction strap of Directional Drilling, circumferentially heat, until the special polyethylene thermal contraction strap of Directional Drilling is fitted in pipe surface completely.
5. a kind of jointing method being applicable to directional drilling crossing pipeline thickening anticorrosive coat according to claim 4, is characterized in that: the special polyethylene thermal contraction strap of described Directional Drilling and pipeline thicken anticorrosive coat bilateral and overlap, and every side lap width is more than or equal to 100mm.
6. a kind of jointing method being applicable to directional drilling crossing pipeline thickening anticorrosive coat according to claim 4, it is characterized in that: after Directional Drilling special polyethylene thermal contraction strap heat shrink is complete, carry out a tempering again, tempering heating time is 2 ~ 3 minutes, makes the abundant melting of hot melt adhesive and overflows from two ends; Discharge bubble with pressure roller simultaneously, and confirm that hot melt adhesive is fully melted with finger pressure.
7. a kind of jointing method being applicable to directional drilling crossing pipeline thickening anticorrosive coat according to claim 1, is characterized in that: the Specific construction step of the Directional Drilling special polyethylene sacrificial band described in the 4th step is as follows:
(1) heating of end upsetting anticorrosive coat and hacking:
Use the thickening anticorrosive coat PE surface of flame to pipe end to heat, heating-up temperature is higher than 75 DEG C; Adopt the manual mode using wire brush to pull on anticorrosive coat surface to carry out hired roughneck, make anticorrosive coat surface have roughness;
(2) heat shrink:
Use fired heater slowly to heat, from the middle of the special polyethylene sacrificial band of Directional Drilling, circumferentially heat, until the special polyethylene sacrificial band of Directional Drilling is fitted in pipe surface completely.
8. a kind of jointing method being applicable to directional drilling crossing pipeline thickening anticorrosive coat according to claim 7, it is characterized in that: described Directional Drilling special polyethylene sacrificial band and the special polyethylene thermal contraction strap lap width of Directional Drilling are 100mm, and it is 200mm that the special polyethylene sacrificial band of Directional Drilling and pipeline thicken anticorrosive coat lap width.
9. a kind of jointing method being applicable to directional drilling crossing pipeline thickening anticorrosive coat according to claim 7, it is characterized in that: after Directional Drilling special polyethylene sacrificial band heat shrink is complete, carry out a tempering again, tempering heating time is 2 ~ 3 minutes, makes the abundant melting of hot melt adhesive and overflows from two ends; Discharge bubble with pressure roller simultaneously, and confirm that hot melt adhesive is fully melted with finger pressure.
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| CN201310375712.7A CN103470914B (en) | 2013-08-26 | 2013-08-26 | Joint coating method applicable to thickened erosion-resistant layers of directionally drilled and crossed pipelines |
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| CN201310375712.7A CN103470914B (en) | 2013-08-26 | 2013-08-26 | Joint coating method applicable to thickened erosion-resistant layers of directionally drilled and crossed pipelines |
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| CN108631222A (en) * | 2018-03-19 | 2018-10-09 | 柳州钢铁股份有限公司 | Zinc-Oxide Arrester lead cracking restorative procedure |
| CN109058658A (en) * | 2018-09-27 | 2018-12-21 | 江苏清源管道技术有限公司 | A kind of three layers of PE anticorrosion structure of joint coating on pipeline and construction technology |
| CN115163961A (en) * | 2022-07-12 | 2022-10-11 | 淮河能源燃气集团有限责任公司 | Rapid plugging method for reserved joint of long-distance pipeline |
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| JP2000185352A (en) * | 1998-12-22 | 2000-07-04 | Nitto Denko Corp | Method for anticorrosively repairing outer surface anticorrosive metal pipeline |
| JP2002022092A (en) * | 2000-07-06 | 2002-01-23 | Tokyo Gas Co Ltd | Repair construction method for anticorrosion pipe line |
| CN101936442B (en) * | 2009-07-01 | 2012-12-12 | 北京安科管道工程科技有限公司 | Method for mending steel pipeline polyolefin anticorrosive layer and product obtained by same |
| CN102679086A (en) * | 2011-03-18 | 2012-09-19 | 中国石油天然气集团公司 | Intermediate-frequency heating repaired opening construction technology for thermal contraction band of buried steel pipeline |
| CN102305334B (en) * | 2011-05-20 | 2013-03-20 | 中国石油集团工程设计有限责任公司 | Method for protecting anti-corrosion layer of pipeline during horizontal directional drilling crossing in oil and gas engineering |
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Effective date of registration: 20180111 Address after: 610041 Chengdu high tech Zone, Sichuan province sublimation Road No. 6 Patentee after: China Petroleum Engineering Construction Co Ltd Address before: 610041 Chengdu high tech Zone, Sichuan province sublimation Road No. 6 Patentee before: Engineering Design Co., Ltd., China Petroleum Group |
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Effective date of registration: 20210209 Address after: 100007 No. 9 North Main Street, Dongcheng District, Beijing, Dongzhimen Patentee after: CHINA NATIONAL PETROLEUM Corp. Patentee after: CHINA PETROLEUM ENGINEERING & CONSTRUCTION Corp. Address before: No. 6, Sichuan hi tech Zone, sublime Road, Chengdu, Sichuan Patentee before: CHINA PETROLEUM ENGINEERING & CONSTRUCTION Corp. |