CN106862782B - Method for repairing oil and gas pipeline without stopping transmission - Google Patents
Method for repairing oil and gas pipeline without stopping transmission Download PDFInfo
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- CN106862782B CN106862782B CN201510919327.3A CN201510919327A CN106862782B CN 106862782 B CN106862782 B CN 106862782B CN 201510919327 A CN201510919327 A CN 201510919327A CN 106862782 B CN106862782 B CN 106862782B
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- 238000000034 method Methods 0.000 title claims abstract description 85
- 230000005540 biological transmission Effects 0.000 title description 3
- 238000003466 welding Methods 0.000 claims abstract description 172
- 230000008569 process Effects 0.000 claims abstract description 47
- 230000008439 repair process Effects 0.000 claims abstract description 23
- 238000004519 manufacturing process Methods 0.000 claims description 19
- 239000012530 fluid Substances 0.000 claims description 3
- 238000003912 environmental pollution Methods 0.000 abstract description 5
- 239000007789 gas Substances 0.000 description 103
- 238000010586 diagram Methods 0.000 description 11
- 238000010276 construction Methods 0.000 description 10
- 229910000831 Steel Inorganic materials 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
- 239000003209 petroleum derivative Substances 0.000 description 7
- 238000001816 cooling Methods 0.000 description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 238000005507 spraying Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000003345 natural gas Substances 0.000 description 3
- 239000003208 petroleum Substances 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 231100000241 scar Toxicity 0.000 description 2
- 238000002604 ultrasonography Methods 0.000 description 2
- 239000011324 bead Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
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- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000005067 remediation Methods 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/06—Tubes
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pipe Accessories (AREA)
Abstract
The invention discloses a method for repairing an oil and gas pipeline without stopping transportation, and belongs to the technical field of oil and gas pipeline repair. The method for repairing the oil and gas pipeline comprises the following steps: step a, acquiring the wall thickness of a pipeline at a part needing to be repaired on an oil and gas pipeline; b, acquiring the actual pressure of the part needing to be repaired on the oil and gas pipeline; c, determining welding process parameters according to the wall thickness of the pipeline and the actual pressure, wherein the welding process parameters comprise the diameter of a welding rod, the output current of an electric welding machine and the electric welding time; and d, welding a pipeline cover on the outer surface of the part needing to be repaired on the oil and gas pipeline according to the welding process parameters. By adopting the method, the oil and gas pipeline can be repaired on the premise of not stopping transportation, the repairing efficiency is high, the labor intensity of constructors is low, and the environmental pollution is avoided.
Description
Technical field
The present invention relates to oil-gas pipeline recovery technique field, in particular to a kind of method of on-line production repairing oil/gas pipeline.
Background technique
Oil-gas pipeline part during long-term transfer oil natural gas can be corroded, and the position being corroded can seep
Leakage seriously affects normally conveying and there are security risks for petroleum gas.Therefore, in order to guarantee the normal of petroleum gas
Conveying, needs to repair the position that oil-gas pipeline is corroded.
Currently used oil-gas pipeline restorative procedure needs to repair the outer surface weld plate at position in oil-gas pipeline.But
It is since pipe pressure is higher in oil-gas pipeline transmission process, and welding pool temperature is higher, pressure-resistant performance is poor, holds in welding process
Oil-gas pipeline rupture is easily led to, the substance inside oil-gas pipeline goes out initiation accident.Therefore, it needs Oil/Gas Pipe before welding
Road stops transport, is vented pipeline after tube voltage drop to zero, is then welded again.
In the implementation of the present invention, the inventors discovered that in the prior art the prior art has at least the following problems: existing repair
The method of multiple oil-gas pipeline needs that oil-gas pipeline is stopped transport and is vented, and the operation of this process is more complicated, leads to whole repair
The multiple time is elongated, and working efficiency is low, but also increases the labor intensity of construction personnel.Meanwhile stoppage in transit can for a long time for oil-gas pipeline
It can cause safety accident, such as petroleum stops transport can solidify for a long time.In addition, it is natural to have petroleum during oil-gas pipeline emptying
Gas leakage causes the waste and environmental pollution of petroleum gas into ambient enviroment.
Summary of the invention
In order to solve the above technical problems, the present invention provides a kind of method of on-line production repairing oil/gas pipeline.
Specifically, including technical solution below:
The method of on-line production repairing oil/gas pipeline, the method for the multiple oil-gas pipeline the following steps are included:
Step a obtains the pipeline wall thickness at the position for needing to repair on oil-gas pipeline；
Step b obtains the actual pressure at the position for needing to repair on the oil-gas pipeline；
Step c determines welding condition, the welding condition according to the pipeline wall thickness and the actual pressure
The output electric current of diameter, electric welding machine including welding rod and electric welding time；
It welds the outer surface of step d, the position for needing to repair on the oil-gas pipeline according to the welding condition
Pipeline cover.
Further, in step c, as the pipeline wall thickness≤6mm, the diameter of the welding rod is 2.5mm；When the pipe
When road wall thickness > 6mm, the diameter of the welding rod is 3.2mm.
Further, the electric welding time described in step c is 6~8s；In step d, 6~8s of every welding stops welding, butt welding
Socket part position cools down.
Further, between step a and step b further include: according to the pipeline wall thickness that the collection of the oil-gas pipeline is defeated
Pressure is adjusted in welding process within the scope of pipeline pressure-bearing.
Further, as 2.5mm≤pipeline wall thickness≤3mm, in the welding process pipeline pressure-bearing range be≤
0.6MPa；When pipeline wall thickness≤4mm described in the 3mm <, pipeline pressure-bearing range is≤1MPa in the welding process；As 4mm <
When pipeline wall thickness≤the 5mm, pipeline pressure-bearing range is≤2MPa in the welding process；The pipeline wall thickness described in the 5mm <≤
When 6mm, pipeline pressure-bearing range is≤3MPa in the welding process；When pipeline wall thickness≤7mm described in the 6mm <, the welding
Pipeline pressure-bearing range is≤4MPa in the process；As pipeline wall thickness > 7mm, in the welding process pipeline pressure-bearing range be >
4MPa。
Further, between step b and step c further include: obtain the moisture content of fluid in the oil-gas pipeline；Step c
In, the output electric current of electric welding machine is determined according to the pipeline wall thickness, the actual pressure and the moisture content.
Further, when the moisture content≤0.5%, the output electric current of the electric welding machine is 75A；When 0.5% < institute
When stating moisture content≤10%, the output electric current of the electric welding machine is 75A~90A；As the moisture content > 10%, the electric welding
The output electric current of machine is 90A.
Further, in step d, welding times are 2 times；Welding uses 422 type welding rods for the first time；Second of welding uses
427 type welding rods.
Further, the pipeline cover includes cover, upper cover plate and the side cover plate positioned at the cover both ends, the cover
Body and upper cover plate are combined to form hollow cylinder, and the internal diameter of the hollow cylinder is greater than the outer diameter of the oil-gas pipeline；It is described
Side cover plate includes the first side cover plate and the second side cover plate, and first side cover plate and second side cover plate are combined to form annulus,
The internal diameter of the annulus is matched with the outer diameter of the oil-gas pipeline, the outer diameter of the annulus and the cover and upper cover plate pairing
The outer diameter of the hollow cylinder of formation matches.
Further, when the oil-gas pipeline needs the position repaired to be provided with plugging valve, the cover or described
Aperture is provided on upper cover plate；The pipeline cover further includes blocking valve bonnet.
The beneficial effect of technical solution provided in an embodiment of the present invention is:
In oil-gas pipeline restorative procedure provided in an embodiment of the present invention, according to carrying out on oil-gas pipeline repairing position
Wall thickness and actual pressure determine the welding conditions such as core diameter, electric welding machine output power and electric welding time, make to weld
Technological parameter is matched with pipeline wall thickness and pipeline pressure, so that the welding position of oil-gas pipeline be made to be able to bear in welding process
The variation of the conditions such as temperature, pressure prevents oil-gas pipeline rupture in welding process from causing safety accident.Using the embodiment of the present invention
The oil-gas pipeline restorative procedure of offer, does not need stoppage in transit oil-gas pipeline, enormously simplifies reparation operation, improves working efficiency, and
And the normal conveying of petroleum gas is not influenced, it not will cause environmental pollution.With it is existing under the conditions of stopping transportation to oil-gas pipeline
The method repaired is compared, and it is small that the method for on-line production repairing oil/gas pipeline provided in an embodiment of the present invention can reduce 1.5
When or so the switching flow time, can be avoided oil-gas pipeline be vented 2~3 hours.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is the flow diagram of the method for the on-line production repairing oil/gas pipeline that embodiment 1 provides；
Fig. 2 is the flow diagram of the method for the on-line production repairing oil/gas pipeline that embodiment 2 provides；
Fig. 3 is pipeline cover and oil-gas pipeline connection schematic diagram in embodiment 2；
Fig. 4 is " T-shaped " pipeline cover structure schematic diagram in embodiment 2；
Fig. 5 is " T-shaped " pipeline cover decomposition diagram in embodiment 2, in which: 5a is the signal of the first side cover plate structure
Figure, 5b are upper cover plate structural schematic diagram, and 5c is the second side cover plate structure schematic diagram, and 5d is cover structural schematic diagram；
Fig. 6 is " positive T-shaped " pipeline cover structure schematic diagram in embodiment 2；
Fig. 7 is " side T-shaped " pipeline cover structure schematic diagram in embodiment 2；
Fig. 8 is " linear type " pipeline cover structure schematic diagram in embodiment 2.
Appended drawing reference respectively indicates:
1, pipeline cover；101, cover；102, the second side cover plate；103, the first side cover plate；
104, upper cover plate；105, valve bonnet is blocked；
2, oil-gas pipeline；
3, drainage is shorted；
4, plugging valve.
Specific embodiment
To keep technical solution of the present invention and advantage clearer, below in conjunction with attached drawing to embodiment of the present invention make into
One step it is described in detail.
Embodiment 1
The present embodiment provides a kind of methods of on-line production repairing oil/gas pipeline, referring to Fig. 1, the side of the defeated repairing oil/gas pipeline
Method the following steps are included:
Step 101, the pipeline wall thickness for needing to repair position on oil-gas pipeline is obtained；
Step 102, the actual pressure for needing to repair position on oil-gas pipeline is obtained；
Step 103, determine that welding condition, welding condition include weldering according to pipeline wall thickness and the actual pressure
The diameter of item, the output electric current of electric welding machine and electric welding time；
Step 104, need to repair the outer surface welded pipe line cover at position on oil-gas pipeline according to welding condition.
In oil-gas pipeline restorative procedure provided in this embodiment, according to the wall thickness for carrying out repairing position on oil-gas pipeline
The welding conditions such as core diameter, electric welding machine output power and electric welding time are determined with actual pressure, make welding procedure
Parameter is matched with pipeline wall thickness and pipeline pressure, so that the welding position of oil-gas pipeline be made to be able to bear welding process medium temperature
The variation of the conditions such as degree, pressure prevents oil-gas pipeline rupture in welding process from causing safety accident.It is mentioned using the embodiment of the present invention
The oil-gas pipeline restorative procedure of confession, does not need stoppage in transit oil-gas pipeline, enormously simplifies reparation operation, improves working efficiency, and
The normal conveying for not influencing petroleum gas, not will cause environmental pollution.
Embodiment 2
The present embodiment provides a kind of methods of on-line production repairing oil/gas pipeline, pass through core diameter, electric welding machine output power
And electric welding time etc. matches between welding conditions and pipeline wall thickness, pipeline pressure, enables the welding position of oil-gas pipeline
The variation for enough bearing the conditions such as temperature, pressure in welding process prevents oil-gas pipeline in welding process from rupturing, to realize not
Oil-gas pipeline is repaired under the premise of stopping transportation.Referring to fig. 2, the repairing oil/gas pipeline method the following steps are included:
Step 201, preparation of construction.
First in the constructing operation hole of specification, the position for needing to repair on oil-gas pipeline is cleared up, its table is removed
The insulating layer and erosion resistant coating in face.Then suitable pipeline cover 1 is selected, to the pipeline cover 1 in subsequent welding process and oil-gas pipeline 2
The possible weld setting-out in surface needs if there is scar at setting-out to progress grinding process at scar.
Referring to Fig. 3~Fig. 8, the pipeline cover 1 that uses in the present embodiment mainly includes " T-shaped " pipeline cover (Fig. 4), " just
T-shaped " pipeline cover (Fig. 6), " side T-shaped " pipeline cover (Fig. 7) and " "-" type " pipeline cover (Fig. 8).Wherein, " T-shaped
Shape " pipeline cover, " positive T-shaped " pipeline cover and " side T-shaped " pipeline cover are applicable to repair near sites and be provided with to draw
Stream is shorted the reparation of the oil-gas pipeline of 3 and plugging valve 4 comprising cover 101, upper cover plate 104, positioned at 101 both ends of cover
Side cover plate and closure valve bonnet 105.Cover 101 and upper cover plate 104 are combined to form hollow cylinder, are formed by hollow cylinder
Internal diameter be greater than oil-gas pipeline 2 outer diameter.Side cover plate includes the first side cover plate 103 and the second side cover plate 102, the first side cover plate
103 and second side cover plate 102 be combined to form annulus, the internal diameter of annulus is matched with the outer diameter of oil-gas pipeline 2, the outer diameter of annulus with
The outer diameter for the hollow cylinder that cover 101 and upper cover plate 104 are combined to form matches.When being repaired to oil-gas pipeline, it is
By the way that pipeline cover 1 is integrally welded to Oil/Gas Pipe with oil-gas pipeline welding by the first side cover plate 103 and the second side cover plate 102
Road needs the position repaired.
Above-mentioned " positive T-shaped " pipeline cover is that aperture " T-shaped " pipeline cover is provided on upper cover plate 104 is in cover
Aperture is arranged in 101 bottom of body, and " side T-shaped " pipeline cover is that aperture is arranged in 101 side of cover, is shorted 3 according to drainage and blocks
Position of the valve 4 on oil-gas pipeline selects suitable pipeline cover 1, stretches out drainage short circuit 3 and plugging valve 4 from aperture, will block
105 sets of valve bonnet are shorted outside 3 and plugging valve 4 in drainage and are welded and fixed with upper cover plate 104.
" "-" type " pipeline cover is applicable to repair the oil that near sites are not provided with drainage short circuit 3 and plugging valve 4
The reparation of feed channel comprising cover 101, upper cover plate 104, the side cover plate positioned at 101 both ends of cover, side cover plate include the first side
Cover board 103 and the second side cover plate 102.The connection type of " "-" type " pipeline cover and oil-gas pipeline and above-mentioned " T-shaped " pipe
Road cover, " positive T-shaped " pipeline cover and " side T-shaped " pipeline cover are identical.
Above-mentioned pipeline cover 1 can be prefabricated in advance.At the both ends of steel pipe, welding blind plate obtains prefabricated pipeline cover.It is existing in construction
, according to the actual situation again by prefabricated pipeline cover be cut into cover 101, the first side cover plate 103, the second side cover plate 102 and on
Above-mentioned several parts are being welded into an entirety after connecting with oil-gas pipeline by cover board 104.3 and closure are shorted for being equipped with drainage
The reparation of the oil-gas pipeline of valve 4, will also be in corresponding position aperture.
The tubing of steel pipe for prefabricated pipeline cover 1 can use 20# steel, and 20# pots can be used if needing high intensity
Furnace steel.The diameter of steel pipe can one to two grades thicker than the diameter of oil-gas pipeline 2.Common steel pipe pipe diameter sequence are as follows:Deng；For example, working as oil-gas pipeline 2
It isTubing, then may be selectedOrTubing carry out prefabricated pipeline cover 1.The wall thickness of steel pipe can be according to oil gas
The design pressure-bearing of pipeline selects.The length of steel pipe includes but is not limited to tri- kinds of 500mm, 750mmm and 1000mm, to meet
The needs of different repaired areas.Blocking valve bonnet 105 can choose20# tubing it is individually prefabricated, it is short that when construction, entangles drainage
Connect 3 and plugging valve 4 again with 1 butt welding of pipeline cover.
Step 202, the pipeline wall thickness for needing to repair position on oil-gas pipeline is obtained.
It, can be using based on ultrasonic measurement principle due to needing to obtain pipeline wall thickness in the case where on-line production
Small-sized survey wall thickness instrument needs to repair the pipeline wall thickness at position to obtain on oil-gas pipeline.Small-sized survey wall thickness instrument uses small processor
The thickness of quick, not damaged, prepared measurement pipeline arm is capable of in control；It receives circuit, the higher-order of oscillation by transmit circuit
Device counts door, and counter, central processing unit, keyboard, the part such as display forms；Its working principle is that: the ultrasound for transmitting of popping one's head in
Wave impulse reaches testee and propagates in object, by reflection receivable when reaching material interface, passes through precise measurement ultrasound
The time that wave is propagated in the material determines the wall thickness of oil-gas pipeline.
Step 203, the defeated pressure of the collection of oil-gas pipeline is adjusted in welding process by the pipeline wall thickness obtained according to step 202
Within the scope of pipeline pressure-bearing.
The pressure limit that different pipeline wall thickness is able to bear in the welding process is different.In order to guarantee subsequent welding operation
Safety, the defeated pressure of the collection of oil-gas pipeline can be adjusted in welding process within the scope of pipeline pressure-bearing, be in oil-gas pipeline
Low-pressure delivery mode.Different pipeline wall thickness and the corresponding relationship of its pressure-bearing range are as follows:
As 2.5mm≤pipeline wall thickness≤3mm, pipeline pressure-bearing range is≤0.6MPa in welding process；
As 3mm < pipeline wall thickness≤4mm, pipeline pressure-bearing range is≤1MPa in welding process；
As 4mm < pipeline wall thickness≤5mm, pipeline pressure-bearing range is≤2MPa in welding process；
As 5mm < pipeline wall thickness≤6mm, pipeline pressure-bearing range is≤3MPa in welding process；
As 6mm < pipeline wall thickness≤7mm, pipeline pressure-bearing range is≤4MPa in welding process；
As pipeline wall thickness > 7mm, pipeline pressure-bearing range is > 4MPa in welding process.
Such as when pipeline wall thickness is 3mm, the defeated pressure of the collection of oil-gas pipeline should be adjusted to 0.6MPa hereinafter, working as duct wall
When thickness is 3.5mm, the defeated pressure that integrates of oil-gas pipeline should be adjusted to 1MPa hereinafter, when pipeline wall thickness is 4.5mm, it should be by oil gas
The defeated pressure that integrates of pipeline is adjusted to 2MPa hereinafter, when pipeline wall thickness is 6mm, should be adjusted to the defeated pressure of the collection of oil-gas pipeline
The defeated pressure of the collection of oil-gas pipeline should be adjusted to 4MPa or less hereinafter, when pipeline wall thickness is 7mm by 3MPa.
It should be noted that in the actual construction process, can without step 203, i.e., under total pressure transport model into
Row subsequent soldering step, but there is security risk in this way, in order to guarantee construction safety, preferably carry out in a low voltage state subsequent
Welding step.
Step 204, the actual pressure for needing to repair position on oil-gas pipeline is obtained.
Since during oil and gas transmission, the actual pressure of oil-gas pipeline different parts is different, it is therefore desirable to obtain
Take the actual pressure for needing to repair position on oil-gas pipeline.Pressure is temporarily installed at the position that can need to repair on oil-gas pipeline
Power table obtains actual pressure.
Step 205, the moisture content of fluid in oil-gas pipeline is obtained.
Since the moisture content of the petroleum or natural gas that convey in oil-gas pipeline also will affect subsequent welding, it can
To consider to match welding condition with the moisture content of petroleum or natural gas.3 and envelope are shorted for being equipped with drainage
For the oil-gas pipeline of stifled valve 4, petroleum or weather sample can be acquired from drainage short circuit 3 to be measured to its moisture content.
Actual pressure that the pipeline wall thickness that step 206, is obtained according to step 202, step 204 obtain and step 205
The moisture content arrived determines to include the diameter of welding rod, the output electric current of electric welding machine and electric welding time welding condition.
Wherein,
The corresponding relationship of pipeline wall thickness and core diameter are as follows:
As pipeline wall thickness≤6mm, the diameter of welding rod 65 used is 2.5mm；
As pipeline wall thickness > 6mm, the diameter of welding rod used is 3.2mm.
When core diameter is smaller, resistance high current is small when electric welding, and when core diameter is larger, resistance low current is big when electric welding.
(back welding connects to be welded corresponding relationship between pipeline wall thickness, actual pressure and electric welding machine output electric current for the first time
When):
As pipeline actual pressure≤0.6MPa in 2.5mm≤pipeline wall thickness≤3mm, welding process, electric welding machine output electricity
Stream: between 60A to 65A；
As pipeline actual pressure≤1MPa in 3mm < pipeline wall thickness≤4mm, welding process, electric welding machine output electric current is
65A；
As pipeline actual pressure≤2MPa in 4mm < pipeline wall thickness≤5mm, welding process, electric welding machine output electric current is
70A；
As 5mm < pipeline wall thickness≤6mm, in welding process when pipeline actual pressure≤3MPa, electric welding machine exports electric current
For 75A；
When pipeline wall thickness≤7mm described in the 6mm <, in welding process when pipeline actual pressure≤4MPa, electric welding machine output
Electric current is 80A；
As pipeline actual pressure 4MPa or more in pipeline wall thickness 7mm or more, welding process, electric welding machine output electric current is
90A。
The corresponding relationship of moisture content and electric welding machine output electric current is (when back welding connects i.e. welding for the first time):
When moisture content≤0.5%, the output electric current of electric welding machine is 75A；
When the moisture content described in 0.5% <≤10%, the output electric current of electric welding machine is 75A~90A；
As moisture content > 10%, the output electric current of electric welding machine is 90A.
Moisture content is higher, and the output electric current of electric welding machine is also bigger.Water has the function of cooling, therefore, when moisture content is higher
When, bath temperature will not be caused excessively high using higher electric current.
When the output electric current and the electricity determining by moisture content of the electric welding machine determined by pipeline wall thickness and actual pressure
When welding machine output electric current is inconsistent, lesser electric current should be selected, to ensure the safety in welding process.For example, when 4mm < is managed
In road wall thickness≤5mm, welding process when pipeline actual pressure≤2MPa, moisture content moisture content > 10%, electric welding machine exports electric current
It should be 70A；When pipeline actual pressure 4MPa or more, moisture content in pipeline wall thickness 7mm or more, welding process≤0.5%, electric welding
Machine output electric current should be 75A.
The electric welding time refers to every welding after a certain period of time, stops welding, carries out water-spraying control cooling to welding position, especially
It is regularly spray cooling to be carried out to the back welding line that oil-gas pipeline 2 and pipeline cover 1 directly contact.Being welded the time can be according to molten
Temperature change determines in pond.For using diameter to come for the 422 type welding rods of 2.5mm, the working condition that oil-gas pipeline is 20# steel
It says, is referred to table 1 to determine the electric welding time.
Table 1 is welded time and bath temperature corresponding relationship
As can be seen from Table 1, the striking time should be in 8s hereinafter, the control of electric welding time is in 6~8s, i.e., every welding 6
~8s carries out water-spraying control cooling with regard to stopping welding, to guarantee to weld safe operation.
In order to guarantee the intensity and quality of welding, 2 welding can be carried out.Welding is layed foundation for the first time, is welded using 422 types
Item, second of 427 type welding rod of welding, the relatively low characteristic of 422 type welding rod fusing points, weld strength are also relatively low.In order to more
The deficiency once welded is mended, second of 427 type welding rod of welding, fusing point is relatively high, weld strength is relatively high.Welding is mutual twice
Cooperation effectively prevents bead crack phenomenon.
Step 207, need to repair the outer surface at position on oil-gas pipeline according to the welding condition that step 206 determines
Welded pipe line cover.
During welded pipe line cover 1, the first side cover plate 103 and the second side cover plate 102 are first welded to oil-gas pipeline 2
On, then the first side cover plate 103 and the second side cover plate 102 welded, then by cover 101 and the welding of the second side cover plate 102, upper cover
Plate 104 and the first side cover plate 103 weld, and the pipeline cover 1 of valve bonnet 105 are blocked for being provided with, then will block valve bonnet 105 and upper cover
The reparation to oil-gas pipeline 2 is completed in plate 104 or 101 butt welding of cover.In welding process, to accurately hold welding pool see color and
Weld sense of touch, both welded it is solid also ensure that the non-leakage of reparation, hold the equalization point of operation；It is familiar with being welded molten bath theory, the palm
The phase transformation law of bath temperature is held, to ensure that the intensity in weld spot on piping area, rigidity, stiffness, elasticity modulus are up to standard.For and oil gas
Welding between the electric welding that pipeline 2 directly contacts, such as the first side cover plate 103 and the second side cover plate 102 and oil-gas pipeline 2,
It asks 6~8s of every weldering to stop weldering and carries out water-spraying control cooling；To the electric welding that discord oil-gas pipeline 2 directly contacts, such as each portion of pipeline cover 1
/ welding, the measure that can not be taken spot welding, stop weldering, water-spraying control cooling in limited time but will follow the general rule of electric welding
Model.After the completion of reparation, defeated pressure will be collected and adjust back the defeated pressure of proper set.
To sum up, the stopping transportation that oil-gas pipeline restorative procedure provided in this embodiment solves pipe-repairing after traditional stopping transportation is cut
Change of current journey frequent operation, blowing out switching flow frequent operation, emptying change cut flow operations frequently, oil landing receive oily heavy workload,
The problems such as construction periphery is polluted, the repairing construction time is long, operating expenses is high, construction personnel's labor intensity is high.Stopping with existing
The method repaired under the conditions of defeated to oil-gas pipeline is compared, the method for on-line production repairing oil/gas pipeline provided in this embodiment
The switching flow time that 1.5 hours or so can be reduced can be avoided oil-gas pipeline and be vented 2~3 hours, significantly improves Oil/Gas Pipe
Road remediation efficiency reduces construction personnel's labor intensity, and free from environmental pollution.
The above is merely for convenience of it will be understood by those skilled in the art that technical solution of the present invention, not to limit
The present invention.All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in this
Within the protection scope of invention.
Claims (8)
1. a kind of method of on-line production repairing oil/gas pipeline, which is characterized in that the method for the repairing oil/gas pipeline includes following
Step:
Step a obtains the pipeline wall thickness for needing to repair position on oil-gas pipeline；
Step b obtains the actual pressure for needing to repair position on the oil-gas pipeline；
Obtain the moisture content of fluid in the oil-gas pipeline；
Step c determines that welding condition, the welding condition include according to the pipeline wall thickness and the actual pressure
The diameter of welding rod, the output electric current of electric welding machine and electric welding time；Wherein the output electric current of the electric welding machine is according to the pipe
Road wall thickness, the actual pressure and the moisture content determine, when the moisture content≤0.5%, the electric welding machine it is defeated
Electric current is 75A out；When the moisture content described in 0.5% <≤10%, the output electric current of the electric welding machine is 75A~90A；When described
When moisture content > 10%, the output electric current of the electric welding machine is 90A；
Step d needs to repair the outer surface welded pipe line cover at position according to the welding condition on the oil-gas pipeline.
2. the method for on-line production repairing oil/gas pipeline according to claim 1, which is characterized in that in step c,
As the pipeline wall thickness≤6mm, the diameter of the welding rod is 2.5mm；
As the pipeline wall thickness > 6mm, the diameter of the welding rod is 3.2mm.
3. the method for on-line production repairing oil/gas pipeline according to claim 1, which is characterized in that be welded described in step c
Time is 6~8s；In step d, 6~8s of every welding stops welding, cools down to welding position.
4. the method for on-line production repairing oil/gas pipeline according to claim 1, which is characterized in that between step a and step b
Further include:
The defeated pressure of the collection of the oil-gas pipeline is adjusted in welding process within the scope of pipeline pressure-bearing according to the pipeline wall thickness.
5. the method for on-line production repairing oil/gas pipeline according to claim 4, which is characterized in that
As 2.5mm≤pipeline wall thickness≤3mm, pipeline pressure-bearing range is≤0.6MPa in the welding process；
When pipeline wall thickness≤4mm described in the 3mm <, pipeline pressure-bearing range is≤1MPa in the welding process；
When pipeline wall thickness≤5mm described in the 4mm <, pipeline pressure-bearing range is≤2MPa in the welding process；
When pipeline wall thickness≤6mm described in the 5mm <, pipeline pressure-bearing range is≤3MPa in the welding process；
When pipeline wall thickness≤7mm described in the 6mm <, pipeline pressure-bearing range is≤4MPa in the welding process；
As pipeline wall thickness > 7mm, pipeline pressure-bearing range is > 4MPa in the welding process.
6. the method for on-line production repairing oil/gas pipeline according to claim 1, which is characterized in that in step d, welding times
It is 2 times；Welding uses 422 type welding rods for the first time；Second of welding uses 427 type welding rods.
7. the method for on-line production repairing oil/gas pipeline according to claim 1, which is characterized in that the pipeline cover includes cover
Body, upper cover plate and the side cover plate positioned at the cover both ends, the cover and upper cover plate are combined to form hollow cylinder, described
The internal diameter of hollow cylinder is greater than the outer diameter of the oil-gas pipeline；
The side cover plate includes the first side cover plate and the second side cover plate, first side cover plate and the second side cover plate pairing shape
At annulus, the internal diameter of the annulus is matched with the outer diameter of the oil-gas pipeline, the outer diameter of the annulus and the cover and upper
The outer diameter for the hollow cylinder that cover board is combined to form matches.
8. the method for on-line production repairing oil/gas pipeline according to claim 7, which is characterized in that when the oil-gas pipeline needs
When the position to be repaired is provided with plugging valve, aperture is provided on the cover or the upper cover plate；The pipeline cover also wraps
Include closure valve bonnet.
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| CN201225491Y (en) * | 2008-05-15 | 2009-04-22 | 中国石油天然气股份有限公司 | On-line repairing and reinforcing structure for oil pipeline |
| CN101579774A (en) * | 2008-05-15 | 2009-11-18 | 中国石油天然气股份有限公司 | On-line repairing and reinforcing structure for oil pipeline |
| CN103016893A (en) * | 2011-09-21 | 2013-04-03 | 中国建筑第七工程局有限公司 | Hot tapping plugging construction method of long natural gas delivery pipeline |
| CN204403671U (en) * | 2014-12-09 | 2015-06-17 | 南京梅山冶金发展有限公司 | A kind of repairing device of continuous in-service pipeline weld seam |
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| CN201225491Y (en) * | 2008-05-15 | 2009-04-22 | 中国石油天然气股份有限公司 | On-line repairing and reinforcing structure for oil pipeline |
| CN101579774A (en) * | 2008-05-15 | 2009-11-18 | 中国石油天然气股份有限公司 | On-line repairing and reinforcing structure for oil pipeline |
| CN103016893A (en) * | 2011-09-21 | 2013-04-03 | 中国建筑第七工程局有限公司 | Hot tapping plugging construction method of long natural gas delivery pipeline |
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