CN102305334B - Method for protecting anti-corrosion layer of pipeline during horizontal directional drilling crossing in oil and gas engineering - Google Patents
Method for protecting anti-corrosion layer of pipeline during horizontal directional drilling crossing in oil and gas engineering Download PDFInfo
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- CN102305334B CN102305334B CN 201110130971 CN201110130971A CN102305334B CN 102305334 B CN102305334 B CN 102305334B CN 201110130971 CN201110130971 CN 201110130971 CN 201110130971 A CN201110130971 A CN 201110130971A CN 102305334 B CN102305334 B CN 102305334B
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Abstract
The invention discloses a method for protecting an anti-corrosion layer of a pipeline during horizontal directional drilling crossing in oil and gas engineering. By the method, the completeness of the anti-corrosion layer of the pipeline in the horizontal directional drilling crossing process can be protected, the anti-corrosion layer is prevented from being scratched, and the operating safety and reliability of the pipeline are improved. The method can be also applied to protection of the anti-corrosion layer of a ground buried pipeline in rock sections of mountain areas. The method has the advantages that: an epoxy glass steel protection layer is high in hardness and good in anti-scratching performance; with a matched technology, the epoxy glass steel protection layer can be well bonded with the anti-corrosion layer of the pipeline and is difficult to peel in the crossing process; special requirements for anti-corrosion materials of the pipeline and the surface of the materials are avoided; epoxy resin is solidified at normal temperature, and the protection layer is simple and convenient to construct; a weld crater repair part of the pipeline is easy to construct and a damaged part of the protection layer is easy to repair by using the epoxy glass steel protection layer; operation is simple and convenient; the completeness of the anti-corrosion layer of the pipeline of a horizontal directional drilling crossing section can be effectively guaranteed; and the reliability of safe operation of the pipeline is improved.
Description
Technical field
The present invention relates to a kind of method of construction, especially relate to a kind of guard method of petroleum gas engineering Directional Drilling crossing pipeline anticorrosive coat.
Background technique
Directional Drilling (Horizontal Directional Drilling, HDD) crossing technology is widely used under the various soil conditionss oil and gas pipes and passes through rivers, irrigation canals and ditches, expressway, railway and other and be difficult for or be not suitable for the zone that shallow embedding is passed through.Because pipeline herein is buried under underground or river, can't anticorrosive coat be repaired by excavation after the breakage appears in pipeline anticorrosion coating, therefore requires pipeline anticorrosion coating should keep as far as possible its integrity.But at the directional drilling pipeline crossing construction pipeline is returned in hole and to drag the process, because geology and execution conditions are limit, can cause larger destruction to pipeline anticorrosion coating unavoidably, have influence on the integrity of pipeline anticorrosion coating, bring hidden danger to the safe operation of pipeline.Therefore Directional Drilling through section pipeline should adopt anticorrosive coat+external protection structural defence oil and gas pipes.Selecting properly economy, effectively external protection is most important for the safe operation of Directional Drilling through section oil and gas pipes.
Directional Drilling crossing pipeline anticorrosive coat material mainly contains three-layer polyethylene coating (3PE), three-layer polypropylene coating (3PP), clinkery epoxy powder coating etc. in the petroleum gas engineering of home and abroad at present.The protective layer material that had adopted at present mainly contains double-deck fusion bonded epoxy coating, polyurethane protective coating, ultraviolet photocureable material protective coating and epoxy polymer concrete coating etc.
Directional Drilling passes through protective layer material hardness, wear resistance, scratch resistant performance requirement height; And to satisfy and anticorrosive coat (such as the 3PE anticorrosive coat) adhesion strength, shear strength, peeling strength height, the requirement that is difficult for peeling off; It is damaged because of the friction of solid rock in the stratum, anticorrosive coat that extruding causes in crossing process effectively to overcome anticorrosive coat.The scratch resistant performance of the protective polyurethane layer that has adopted at present is poor; The ultraviolet photocureable material protective coating needs repeatedly to apply and must adopt special light sources effectively to solidify; Double-layer wear-resistant fusion bonded epoxy coating can only be prefabricated in the factory, the on-the-spot shortcoming such as be inconvenient to construct.
Summary of the invention
In order to overcome the above-mentioned shortcoming of prior art, the invention provides a kind of guard method of petroleum gas engineering Directional Drilling crossing pipeline anticorrosive coat.
The technical solution adopted for the present invention to solve the technical problems is: a kind of guard method of petroleum gas engineering Directional Drilling crossing pipeline anticorrosive coat comprises the steps:
The first step, anticorrosive coat surface treatment: the pipeline external anti-corrosion layer is carried out visual examination, anticorrosive coat protrusion of surface, burr and corner angle are processed, make it smooth smooth; The anticorrosive coat surface is cleaned, made surface cleaning, drying, without dirt;
Second step, epoxy viscose preparation: press normal-temperature curing epoxy resin proportioning and technological requirement thereof preparation epoxy viscose, prepare complete epoxy viscose at every turn and should within working life, finish using;
The 3rd step, the construction of fiber glass epoxy protective layer:
1) epoxy viscose for preparing in the brushing of anticorrosive coat surface uniform was placed 5 minutes;
2) twine the paving glass fiber cloth from pipeline one end to the other end order, make glass fiber cloth fully infiltrate epoxy viscose, the mode that the glass fiber cloth employing sequentially overlaps, lap width 〉=50mm, and the exposed length 〉=150mm at anticorrosive coat two ends;
Repeat above-mentioned steps 1) and 2), form by " epoxy viscose-n layer ' glass fiber cloth-epoxy viscose '-glass fiber cloth-epoxy viscose " fiber glass epoxy protective layer that consist of, that reach predetermined thickness, wherein n 〉=1;
The steel pipe of 3) having constructed should be placed at normal temperatures and wait for that epoxy viscose solidified in 48 hours;
4) viscose glue of burr, bubble and the sagging on processing fiber glass epoxy protective coating surface makes surfacing smooth;
The 4th step, fiber glass epoxy protective layer repaired mouth, benefit are hindered:
1) repaired mouth: on-the-spot at Directional Drilling for Pipeline Crossing, after the pipe welding port anticorrosive coating repaired mouth is complete, carry out the construction at fiber glass epoxy protective layer repaired mouth position, need overlap straight length fiber glass epoxy protective layer, lap width 〉=300mm at joint coating on pipeline position fiber glass epoxy protective layer;
2) mend wound: if damage at the on-the-spot discovery of Directional Drilling for Pipeline Crossing fiber glass epoxy protective layer; need damage location fiber glass epoxy protective layer is mended wound; at first use antiseptic plaster to fill and lead up damage location; and at damage location circumferencial direction winding epoxy glass fiber cloth, benefit is hindered width and need be exceeded each 100mm of damage location width both sides.
Compared with prior art, good effect of the present invention is: can protect the integrity of pipeline anticorrosion coating in the Directional Drilling crossing process, avoid anticorrosive coat to be scratched, improve conduit running Security, reliability; The inventive method also can be applicable to the protection of mountain area cubic meter of stone section buried pipeline anticorrosive coat, and the concrete discovery of its advantage is as follows:
1, fiber glass epoxy protective layer hardness is high, and good scratch resistant performance is arranged.
2, fiber glass epoxy protective layer and supporting technology and pipeline anticorrosion coating adhesive property are good, are difficult for peeling off in crossing process.
3, for pipeline corrosion protection material and material surface without specific (special) requirements, only need smooth smooth, surface cleaning can be constructed; The fiber glass epoxy protective layer can be prefabricated in the factory (for straight tube and bend pipe), also can finish (for the joint coating on pipeline position), epoxy resin normal temperature cure, protective layer easy construction by site operation.
4, the fiber glass epoxy protective layer is easy, easy and simple to handle for the repairing of the construction at pipe welding port repaired mouth position and protective layer damage location.
Embodiment
A kind of guard method of petroleum gas engineering Directional Drilling crossing pipeline anticorrosive coat comprises the steps:
The first step, anticorrosive coat surface treatment: the pipeline external anti-corrosion layer is carried out visual examination, anticorrosive coat protrusion of surface, burr and corner angle are processed, make it smooth smooth; The anticorrosive coat surface is cleaned, made surface cleaning, drying, without dirt.
Second step, epoxy viscose preparation: press normal-temperature curing epoxy resin proportioning and technological requirement thereof preparation epoxy viscose, prepare complete epoxy viscose at every turn and should within working life, finish using.
The 3rd step, the construction of fiber glass epoxy protective layer:
1) epoxy viscose for preparing in the brushing of anticorrosive coat surface uniform was placed 5 minutes.
2) begin to twine the paving glass fiber cloth from pipeline one end, make glass fiber cloth fully infiltrate epoxy viscose, the mode that the glass fiber cloth employing sequentially overlaps, twine paving from pipeline one end to the other end order, lap width 〉=50mm between the glass fiber cloth, and the exposed length 〉=150mm at anticorrosive coat two ends.
Repeat above-mentioned steps 1) and 2), form by " epoxy viscose-n layer ' glass fiber cloth-epoxy viscose '-glass fiber cloth-epoxy viscose " fiber glass epoxy protective layer that consist of, that reach predetermined thickness, wherein n 〉=1.
The structure of regular grade protective layer is: epoxy viscose-glass fiber cloth-epoxy viscose-glass fiber cloth-epoxy viscose; The structure that adds the intensity level protective layer is: epoxy viscose-glass fiber cloth-epoxy viscose-glass fiber cloth-epoxy viscose-glass fiber cloth-epoxy viscose.
The steel pipe of 3) having constructed should be placed at normal temperatures and wait for that epoxy viscose solidified in 48 hours, if ambient temperature is lower than 0 ℃, should take to heat accordingly measure, and epoxy viscose is solidified.
4) viscose glue of burr, bubble and the sagging on processing fiber glass epoxy protective coating surface makes surfacing smooth.
The 4th step, fiber glass epoxy protective layer repaired mouth, benefit are hindered
1) repaired mouth
On-the-spot at Directional Drilling for Pipeline Crossing, after the pipe welding port anticorrosive coating repaired mouth is complete, can carry out the construction at fiber glass epoxy protective layer repaired mouth position.Joint coating on pipeline position fiber glass epoxy protective layer should overlap straight length fiber glass epoxy protective layer, lap width 〉=300mm.
2) mend wound
Find what the fiber glass epoxy protective layer damaged at the Directional Drilling for Pipeline Crossing scene, reply damage location fiber glass epoxy protective layer is mended wound.At first use antiseptic plaster to fill and lead up damage location, and twine epoxy glass fiber cloth at the damage location circumferencial direction, benefit is hindered width and should be exceeded each 100mm of damage location width both sides.
The straight tube of Directional Drilling crossing pipeline and the protective layer of bend pipe can after prefabricated the finishing, be transported to the job site with pipeline in advance again in factory, the protective layer at joint coating on pipeline position is to carry out after at the scene pipeline welding, repaired mouth work are finished again.
The fiber glass epoxy protective layer of finishing by the inventive method construction can reach following index.
The performance index of table 1 normal-temperature curing epoxy glass fibre reinforced plastics protective material
Claims (1)
1. the guard method of a petroleum gas engineering Directional Drilling crossing pipeline anticorrosive coat is characterized in that: comprise the steps:
The first step, anticorrosive coat surface treatment: the pipeline external anti-corrosion layer is carried out visual examination, anticorrosive coat protrusion of surface, burr and corner angle are processed, make it smooth smooth; The anticorrosive coat surface is cleaned, made surface cleaning, drying, without dirt;
Second step, epoxy viscose preparation: press normal-temperature curing epoxy resin proportioning and technological requirement thereof preparation epoxy viscose, prepare complete epoxy viscose at every turn and should within working life, finish using;
The 3rd step, the construction of fiber glass epoxy protective layer:
1) epoxy viscose for preparing in the brushing of anticorrosive coat surface uniform was placed 5 minutes;
2) twine the paving glass fiber cloth from pipeline one end to the other end order, make glass fiber cloth fully infiltrate epoxy viscose, the mode that the glass fiber cloth employing sequentially overlaps, lap width 〉=50mm, and the exposed length 〉=150mm at anticorrosive coat two ends;
Repeat above-mentioned steps 1) and 2), form by " epoxy viscose-n layer ' glass fiber cloth-epoxy viscose '-glass fiber cloth-epoxy viscose " fiber glass epoxy protective layer that consist of, that reach predetermined thickness, wherein n 〉=1;
The pipeline of 3) having constructed should be placed at normal temperatures and wait for that epoxy viscose solidified in 48 hours;
4) viscose glue of burr, bubble and the sagging on processing fiber glass epoxy protective coating surface makes surfacing smooth;
The 4th step, fiber glass epoxy protective layer repaired mouth, benefit are hindered:
1) repaired mouth: on-the-spot at Directional Drilling for Pipeline Crossing, after the pipe welding port anticorrosive coating repaired mouth is complete, carry out the construction at fiber glass epoxy protective layer repaired mouth position, need overlap straight length fiber glass epoxy protective layer, lap width 〉=300mm at joint coating on pipeline position fiber glass epoxy protective layer;
2) mend wound: if find what the fiber glass epoxy protective layer damaged at the Directional Drilling for Pipeline Crossing scene, need damage location fiber glass epoxy protective layer is mended wound; At first use antiseptic plaster to fill and lead up damage location, and twine epoxy glass fiber cloth at the damage location circumferencial direction, benefit is hindered width and need be exceeded each 100mm of damage location width both sides.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110130971 CN102305334B (en) | 2011-05-20 | 2011-05-20 | Method for protecting anti-corrosion layer of pipeline during horizontal directional drilling crossing in oil and gas engineering |
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| CN 201110130971 CN102305334B (en) | 2011-05-20 | 2011-05-20 | Method for protecting anti-corrosion layer of pipeline during horizontal directional drilling crossing in oil and gas engineering |
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| CN102305334B true CN102305334B (en) | 2013-03-20 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103470914B (en) * | 2013-08-26 | 2015-04-08 | 中国石油集团工程设计有限责任公司 | Joint coating method applicable to thickened erosion-resistant layers of directionally drilled and crossed pipelines |
| CN104565677B (en) * | 2013-10-24 | 2019-03-19 | 中国石油化工股份有限公司 | A kind of erosion resistant coating protection structure of directional drilling crossing segment pipe and preparation method thereof |
| CN106122678A (en) * | 2016-06-23 | 2016-11-16 | 陕西宇阳石油科技工程有限公司 | Directional drilling crossing pipeline external coating structure and processing method thereof |
| CN108663408B (en) * | 2018-05-18 | 2021-02-09 | 中国石油天然气集团有限公司 | Method for determining breakage rate of steel oil and gas pipeline directional drilling anticorrosive coating |
Citations (5)
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| CN1207469A (en) * | 1998-05-15 | 1999-02-10 | 山东胜联实业有限公司 | Glass fibre reinforced plastic and high-density polyethylene compound pipe and mfg. method thereof |
| CN1352365A (en) * | 2001-12-14 | 2002-06-05 | 代有恒 | Method for anti-corrosion for metal pipe line by glass fiber reinforced plastics |
| RU2325584C1 (en) * | 2007-02-21 | 2008-05-27 | Открытое акционерное общество "Газпром" | Insulating anticorrosive material "pam" |
| CN101307856A (en) * | 2007-05-15 | 2008-11-19 | 上海华夏化工材料有限公司 | Steel pipeline corrosion proof reinforcing method |
| CN101943307A (en) * | 2010-08-19 | 2011-01-12 | 四川德源石油天然气工程有限公司 | Anticorrosive structure penetrating through external anticorrosive layer of pipe and preparation method thereof |
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2011
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1207469A (en) * | 1998-05-15 | 1999-02-10 | 山东胜联实业有限公司 | Glass fibre reinforced plastic and high-density polyethylene compound pipe and mfg. method thereof |
| CN1352365A (en) * | 2001-12-14 | 2002-06-05 | 代有恒 | Method for anti-corrosion for metal pipe line by glass fiber reinforced plastics |
| RU2325584C1 (en) * | 2007-02-21 | 2008-05-27 | Открытое акционерное общество "Газпром" | Insulating anticorrosive material "pam" |
| CN101307856A (en) * | 2007-05-15 | 2008-11-19 | 上海华夏化工材料有限公司 | Steel pipeline corrosion proof reinforcing method |
| CN101943307A (en) * | 2010-08-19 | 2011-01-12 | 四川德源石油天然气工程有限公司 | Anticorrosive structure penetrating through external anticorrosive layer of pipe and preparation method thereof |
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Effective date of registration: 20180110 Address after: 610041 Chengdu high tech Zone, Sichuan province sublimation Road No. 6 Patentee after: China Petroleum Engineering Construction Co Ltd Address before: 610017 Sichuan province Chengdu Xiaoguan Temple Backstreet No. 25 Patentee before: Engineering Design Co., Ltd., China Petroleum Group |
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Effective date of registration: 20210210 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. |