CN109834365A - A kind of processing method for small-bore internal coat pipeline butt welding - Google Patents
A kind of processing method for small-bore internal coat pipeline butt welding Download PDFInfo
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- CN109834365A CN109834365A CN201910174611.0A CN201910174611A CN109834365A CN 109834365 A CN109834365 A CN 109834365A CN 201910174611 A CN201910174611 A CN 201910174611A CN 109834365 A CN109834365 A CN 109834365A
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Abstract
A kind of processing method for small-bore internal coat pipeline butt welding first carries out upset processing to blank end, then carries out poling again；Built-up welding retaining wall on slope is carried out to the inner wall of pipe end, groove starting point is from the corresponding position of external upset (EU) starting point, and groove depth is consistent with the amplitude of external upset (EU)；Groove is stuffed entirely with by built-up welding arcing point in groove start position, overlay cladding；Interior preservative treatment, anticorrosive coating are carried out to pipeline；Erosion resistant coating is organic coating or corrosion resistant alloy coating；Last Pipeline butt.The present invention ensure that, in built-up welding retaining wall on slope, the integral strength of pipeline is unaffected by the way of the external upset (EU) of end；After the completion of built-up welding, the smooth transition of inner wall of the pipe ensure that.Destruction of the welding high temperature to erosion resistant coating is effectively prevented during the welding process, and realizes the continuity of inner surface of pipeline erosion resistant coating.
Description
Technical field
The present invention relates to pipeline fields, more particularly, are related to a kind of welded connecting method of small-bore internal coat pipeline.
Background technique
In oil gas field production process, pipeline is chronically at high temperature, high pressure, CO2/H2S, contain Cl-In the environment of water flooding,
Etching problem is very prominent, and traditional carbon steel piping can also face increasingly severe test.Although corrosion resistant alloy can be solved effectively
Certainly etching problem, however its higher cost, one-time investment amount are also relatively large.The coated layer technology of inner surface of pipeline is one
The very economical and effective corrosion-resistant measure of kind.However, oil gas ground pipeline is all made of the mode of welded connecting, in order to guarantee to manage
The internally coated continuity in road and integrality need after site welding to carry out the processing of coating repaired mouth to weld seam position.Currently, bigbore
Pipeline internal joint patch technology is very mature, but not perfect for the internal joint patch technology of small-bore pipeline, and construction quality is also difficult to
Guarantee, the internal joint patch device and method that especially can satisfy pipeline of the caliber within 100mm are substantially at blank.These because
Element significantly limits small-bore coated layer internal coat pipeline in the popularization and application in oil field.
Summary of the invention
In view of the above-mentioned problems, present invention aims at a kind of welded connecting side of small-bore internal coat pipeline is proposed, gram
The problem of repaired mouth is difficult to carry out after existing small-bore internal coat pipeline welds has been taken, Pipeline butt connector corrosion resisting property is reached
To even more than inner coating pipeline, and realize the continuity of inner surface of pipeline erosion resistant coating.
To achieve the above object, the technical solution adopted by the present invention is that:
A kind of processing method for small-bore internal coat pipeline butt welding, comprising the following steps:
(1) pipe end external upset (EU):
Upset processing first is carried out to blank end, then carries out poling again, being formed includes thicken position and non-thicken position
Pipeline；
(2) end processes:
Retaining wall on slope is carried out to the inner wall of pipe end, the starting point of retaining wall on slope is in thicken position, thicken position warp
Wall thickness after retaining wall on slope is greater than or equal to the wall thickness of non-thicken position；
(3) end built-up welding:
Built-up welding is carried out at groove, forms overlay cladding, and groove is stuffed entirely with by overlay cladding；
(4) interior preservative treatment:
To inner wall of the pipe anticorrosive coating, erosion resistant coating is organic coating or corrosion resistant alloy coating.
A further improvement of the present invention lies in that the length of the thicken position is 100~200mm, maximum thicken position
It adds thickness as 1~2mm.
A further improvement of the present invention lies in that erosion resistant coating and overlay cladding lap width are 50~100mm.
A further improvement of the present invention lies in that removing pipe end warp using power electric angle grinder before carrying out step (3)
The burr at mechanical process position, and clean with acetone soln greasy dirt and impurity in groove 500mm.
A further improvement of the present invention lies in that the actual conditions of the end built-up welding of step (3) are as follows: argon tungsten-arc welding is used,
Welding wire is ER NiCrMo-3；Tungsten grade and distance between weldingwires are 3-5mm, and arc length 2.5-3mm, tungsten electrode angle is 30 ° -40 °,
Preheating temperature need to reach predetermined temperature playing forearc measurement, and minimum preheating temperature is 80 DEG C, and preheating length is apart from pipe end
300mm。
A further improvement of the present invention lies in that using polishing machine reconditioning overlay cladding after the completion of built-up welding in step (3).
A further improvement of the present invention lies in that organic coating is epoxy coating, phenolic coating in step (4)
Or polyurethane coating, the coating processes of organic coating are airless spraying or electrostatic spraying；Corrosion resistant alloy coating be Ni-P coating or
Ni-W coating, the coating processes of corrosion resistant alloy coating are chemical plating or plating.
A further improvement of the present invention lies in that further include Pipeline butt, specifically includes the following steps:
Retaining wall on slope is carried out to the end of two pipelines, slope type is single side V-type, root face height 2-2.5mm, groove
Angle is 40 °~60 °, and root face gap is 2-3mm；
Butt welding is carried out at groove, welding manner is monofilament multilayer welding；Welding material is ER NiCrMo-3；Protect gas
Body is argon gas, and welding direction is upward.
A further improvement of the present invention lies in that monofilament multilayer welding includes root bead, transition weldering, filling weldering and cosmetic welding.
A further improvement of the present invention lies in that when carrying out butt welding at groove, the parameter of welding are as follows: root bead voltage is 9-
11V, electric current 60-70A, speed of welding 60-100mm/min, front protecting throughput are 9-10L/min, negatively protect gas
Flow is 6-10L/min, heat input 0.5-1.0KJ/mm；It is 9-11V, electric current 70-80A, speed of welding that voltage is welded in transition
For 100-160mm/min, front protecting throughput is 8-9L/min, and negative protection air-flow amount is 20L/min, heat input 0.5-
1.0KJ/mm；Filling weldering voltage is 9-11V, electric current 80-90A, speed of welding 60-140mm/min, front protecting throughput
For 9-11L/min, negative protection air-flow amount is 20L/min, heat input 0.5-1.5KJ/mm；Cosmetic welding voltage is 9-11V, electricity
Stream is 80-90A, and speed of welding 60-120mm/min, front protecting throughput is 9-11L/min, and negative protection air-flow amount is
20L/min, heat input 0.5-1.0KJ/mm.
Compared with prior art, the invention has the following beneficial effects:
(1) it ensure that, at built-up welding retaining wall on slope, the integral strength of pipeline is unaffected by the way of the external upset (EU) of end；
After the completion of built-up welding, the smooth transition of inner wall of the pipe ensure that.
(2) destruction of the welding high temperature to erosion resistant coating is effectively prevented during the welding process, and realizes inner surface of pipeline
The continuity of erosion resistant coating；
(3) in the present invention by pipeline pipe end external upset (EU), built-up welding retaining wall on slope, built-up welding, butt welding after preservative treatment makes
Pipeline butt connector corrosion resisting property meets or exceeds inner coating pipeline, and realizes the continuous of inner surface of pipeline erosion resistant coating
Property, solve the technical problem of small-bore internal coat pipeline weld seam scene repaired mouth.
Detailed description of the invention
Fig. 1 is pipe end external upset (EU) schematic diagram.
Fig. 2 is pipe end built-up welding groove schematic diagram.
Fig. 3 is pipe end overlay cladding schematic diagram.
In figure, 1 is pipeline, and 2 be built-up welding groove, and 3 be overlay cladding.
Specific embodiment
The present invention is described in detail with reference to the accompanying drawing.
The caliber of small-bore anti-corrosion pipeline of the invention is within 100mm.
Participate in Fig. 1-Fig. 3, the present invention the following steps are included:
(1) pipe end external upset (EU)
The small-bore pipeline that the present invention uses is end external upset (EU) seamless steel pipe, i.e., during tubulation, first to pipe end
Portion carries out upset processing, then carries out poling and following process again, forms the pipeline comprising thicken position and non-thicken position.Its
In, thicken position length L is 100~200mm, and the d that adds thickness of maximum thicken position is 1~2mm.
(2) end processes
It carries out built-up welding groove 2 to the inner wall of 1 end of pipeline to process, the starting point of retaining wall on slope is in thicken position, is thickeied
Wall thickness of the position after retaining wall on slope is greater than or equal to the wall thickness of non-thicken position；Groove depth is consistent with the amplitude of external upset (EU),
I.e. after the completion of retaining wall on slope, pipeline wall thickness uniformity.
(3) end built-up welding
The burr that the machined treatment site of pipe end is removed using power electric angle grinder is needed before weldering, and molten with acetone
Liquid cleans greasy dirt, impurity in groove 500mm；
Then built-up welding is carried out at groove, forms overlay cladding, and groove is stuffed entirely with by overlay cladding；
Wherein, the actual conditions of end built-up welding are as follows: use argon tungsten-arc welding, welding wire is ER NiCrMo-3.Tungsten grade and welding wire
Spacing is 3-5mm, and arc length 2.5-3mm, tungsten electrode angle is 30 ° -40 °.Preheating temperature need to reach rule playing forearc measurement
Determine temperature, minimum preheating temperature is 80 DEG C, and preheating length is apart from pipe end 300mm；
Groove should be stuffed entirely with by built-up welding arcing point in groove start position, overlay cladding 3, guarantee internal diameter of the pipeline uniform one
It causes.Polishing machine reconditioning overlay cladding is used after the completion of built-up welding, keeps inner wall of the pipe smooth, smooth.
(4) interior preservative treatment
Interior preservative treatment is carried out to pipeline, in inner wall of the pipe anticorrosive coating, erosion resistant coating is organic coating or corrosion resistant alloy
Coating.Wherein organic coating be epoxy coating, phenolic coating or polyurethane coating, coating processes be airless spraying or
Electrostatic spraying；Corrosion resistant alloy coating is Ni-P coating or Ni-W coating, and coating processes are respectively chemical plating or plating.Erosion resistant coating with
Pipe end corrosion resistant alloy overlay cladding lap width is 50~100mm.
(5) Pipeline butt
Retaining wall on slope is carried out to the end of two pipelines, slope type is single side V-type, root face height 2-2.5mm, groove
Angle is 40 °~60 °, and root face gap is 2-3mm；
Butt welding is carried out at groove, welding manner is monofilament multilayer welding.
Preweld cleaning: oil, paint, dirt, burr and the moisture within the scope of groove and its interior outer surface 20mm are cleared up, before welding
80 DEG C are preheated within the scope of weld seam or so 150mm.
Interlayer cleaning: the oxide skin on cleaning interlayer welding bead surface, interlayer temperature are controlled at 100 DEG C or less.
Welding manner: monofilament multilayer welding, including root bead, transition weldering, filling weldering, cosmetic welding.
Welding material: ER NiCrMo-3.
Protective gas: argon gas, purity >=99.99%.
Welding direction: upwards.
Welding parameter: 3 are shown in Table.
3 butt weld technologies for steel parameter of table
Claims (10)
1. a kind of processing method for small-bore internal coat pipeline butt welding, which comprises the following steps:
(1) pipe end external upset (EU):
Upset processing first is carried out to blank end, then carries out poling again, forms the pipe comprising thicken position and non-thicken position
Road；
(2) end processes:
Retaining wall on slope is carried out to the inner wall of pipe end, the starting point of retaining wall on slope is in thicken position, and thicken position is through groove
Wall thickness after processing is greater than or equal to the wall thickness of non-thicken position；
(3) end built-up welding:
Built-up welding is carried out at groove, forms overlay cladding, and groove is stuffed entirely with by overlay cladding；
(4) interior preservative treatment:
To inner wall of the pipe anticorrosive coating, erosion resistant coating is organic coating or corrosion resistant alloy coating.
2. the processing method according to claim 1 for small-bore internal coat pipeline butt welding, which is characterized in that described to add
The length at thick position is 100~200mm, and maximum thicken position adds thickness as 1~2mm.
3. the processing method according to claim 1 for small-bore internal coat pipeline butt welding, which is characterized in that erosion resistant coating
It is 50~100mm with overlay cladding lap width.
4. the processing method for small-bore internal coat pipeline butt welding according to claim 1, which is characterized in that carry out
Before step (3), the burr of the machined treatment site of pipe end is removed using power electric angle grinder, and clear with acetone soln
Wash the greasy dirt and impurity in groove 500mm.
5. the processing method according to claim 1 for small-bore internal coat pipeline butt welding, which is characterized in that step
(3) actual conditions of end built-up welding are as follows: use argon tungsten-arc welding, welding wire is ER NiCrMo-3；Tungsten grade and distance between weldingwires are 3-
5mm, arc length 2.5-3mm, tungsten electrode angle are 30 ° -40 °, and preheating temperature need to reach predetermined temperature playing forearc measurement, most
Small preheating temperature is 80 DEG C, and preheating length is apart from pipe end 300mm.
6. the processing method according to claim 1 for small-bore internal coat pipeline butt welding, which is characterized in that step
(3) in, polishing machine reconditioning overlay cladding is used after the completion of built-up welding.
7. the processing method according to claim 1 for small-bore internal coat pipeline butt welding, which is characterized in that step
(4) in, organic coating is epoxy coating, phenolic coating or polyurethane coating, and the coating processes of organic coating are nothing
Gas blowout painting or electrostatic spraying；Corrosion resistant alloy coating is Ni-P coating or Ni-W coating, and the coating processes of corrosion resistant alloy coating are to change
Learn plating or plating.
8. the processing method according to any one of claim 1 to 7 for small-bore internal coat pipeline butt welding, feature
It is, further includes Pipeline butt, specifically includes the following steps:
Retaining wall on slope is carried out to the end of two pipelines, slope type is single side V-type, root face height 2-2.5mm, bevel angle
It is 40 °~60 °, root face gap is 2-3mm；
Butt welding is carried out at groove, welding manner is monofilament multilayer welding；Welding material is ER NiCrMo-3；Protective gas is
Argon gas, welding direction are upward.
9. the processing method according to claim 8 for small-bore internal coat pipeline butt welding, which is characterized in that monofilament is more
Layer weldering includes root bead, transition weldering, filling weldering and cosmetic welding.
10. the processing method according to claim 8 for small-bore internal coat pipeline butt welding, which is characterized in that on slope
When carrying out butt welding at mouthful, the parameter of welding are as follows: root bead voltage is 9-11V, electric current 60-70A, speed of welding 60-
100mm/min, front protecting throughput are 9-10L/min, and negative protection air-flow amount is 6-10L/min, heat input 0.5-
1.0KJ/mm；It is 9-11V, electric current 70-80A, speed of welding 100-160mm/min, front protecting air-flow that voltage is welded in transition
Amount is 8-9L/min, and negative protection air-flow amount is 20L/min, heat input 0.5-1.0KJ/mm；Filling weldering voltage is 9-11V,
Electric current is 80-90A, and speed of welding 60-140mm/min, front protecting throughput is 9-11L/min, negative protection air-flow amount
For 20L/min, heat input 0.5-1.5KJ/mm；Cosmetic welding voltage is 9-11V, electric current 80-90A, speed of welding 60-
120mm/min, front protecting throughput are 9-11L/min, and negative protection air-flow amount is 20L/min, heat input 0.5-
1.0KJ/mm。
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910174611.0A CN109834365B (en) | 2019-03-08 | 2019-03-08 | Processing method for butt welding of small-caliber inner anti-corrosion pipeline |
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| CN201910174611.0A CN109834365B (en) | 2019-03-08 | 2019-03-08 | Processing method for butt welding of small-caliber inner anti-corrosion pipeline |
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| CN112453737A (en) * | 2020-10-27 | 2021-03-09 | 武汉理工大学 | Method for welding pier head of oil and gas transportation metal pipeline |
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| CN109834365B (en) | 2021-09-28 |
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