CN109372442B - Joint coating process method of anti-corrosion oil pipe, anti-corrosion oil pipe and unit thereof - Google Patents
Joint coating process method of anti-corrosion oil pipe, anti-corrosion oil pipe and unit thereof Download PDFInfo
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- CN109372442B CN109372442B CN201811414925.5A CN201811414925A CN109372442B CN 109372442 B CN109372442 B CN 109372442B CN 201811414925 A CN201811414925 A CN 201811414925A CN 109372442 B CN109372442 B CN 109372442B
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- 238000005260 corrosion Methods 0.000 title claims abstract description 163
- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000000576 coating method Methods 0.000 title claims description 12
- 238000003466 welding Methods 0.000 claims abstract description 31
- 239000000463 material Substances 0.000 claims abstract description 28
- 230000008878 coupling Effects 0.000 claims abstract description 24
- 238000010168 coupling process Methods 0.000 claims abstract description 24
- 238000005859 coupling reaction Methods 0.000 claims abstract description 24
- 238000010438 heat treatment Methods 0.000 claims abstract description 23
- 239000000126 substance Substances 0.000 claims abstract description 22
- 230000008569 process Effects 0.000 claims abstract description 16
- 230000007797 corrosion Effects 0.000 claims description 27
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 24
- 229910052782 aluminium Inorganic materials 0.000 claims description 24
- 229910000831 Steel Inorganic materials 0.000 claims description 14
- 102220498074 Transmembrane 4 L6 family member 20_N80Q_mutation Human genes 0.000 claims description 14
- 239000010959 steel Substances 0.000 claims description 14
- 230000000149 penetrating effect Effects 0.000 claims description 12
- 229910000838 Al alloy Inorganic materials 0.000 claims description 10
- KCZFLPPCFOHPNI-UHFFFAOYSA-N alumane;iron Chemical compound [AlH3].[Fe] KCZFLPPCFOHPNI-UHFFFAOYSA-N 0.000 claims description 10
- 150000001875 compounds Chemical class 0.000 claims description 10
- 238000005269 aluminizing Methods 0.000 claims description 7
- 239000011248 coating agent Substances 0.000 claims description 7
- 238000005121 nitriding Methods 0.000 claims description 7
- 230000003647 oxidation Effects 0.000 claims description 7
- 238000007254 oxidation reaction Methods 0.000 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052596 spinel Inorganic materials 0.000 claims description 6
- 239000011029 spinel Substances 0.000 claims description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 5
- 238000010791 quenching Methods 0.000 claims description 4
- 230000000171 quenching effect Effects 0.000 claims description 4
- 230000020169 heat generation Effects 0.000 claims description 3
- 238000004904 shortening Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000012545 processing Methods 0.000 abstract description 2
- 238000011161 development Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000005536 corrosion prevention Methods 0.000 description 3
- 210000001503 joint Anatomy 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000001364 causal effect Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
-
- 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
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/12—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding
- B23K20/122—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding using a non-consumable tool, e.g. friction stir welding
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
- Protection Of Pipes Against Damage, Friction, And Corrosion (AREA)
Abstract
The invention provides a port repairing process method of an anti-corrosion oil pipe, the anti-corrosion oil pipe and units thereof, wherein the port repairing process method comprises the following steps: acquiring a first pipe section and two second pipe sections; friction welding is adopted to enable the two second pipe sections to be respectively and fixedly connected to the two ends of the first pipe section; performing chemical heat treatment on a tubular column formed by connecting the first pipe section and the second pipe section in series, so that at least an anti-corrosion layer is formed on the inner wall and the outer wall of the first pipe section; processing the outer walls of the end parts of the two second pipe sections far away from the first pipe section to form external threads, wherein one first pipe section and the two second pipe sections which are connected in series form an anti-corrosion oil pipe unit; repeating the steps to obtain a plurality of anti-corrosion oil pipe units; adopting a tubing coupling to connect a plurality of anti-corrosion tubing units in series to obtain an anti-corrosion tubing; the material of the oil pipe coupling is the same as that of the second pipe section, and the inner wall of the oil pipe coupling is processed to form an internal thread matched with the external thread. The embodiment of the invention can reliably realize the port repairing of the anti-corrosion oil pipe.
Description
Technical Field
The invention relates to the technical field of pipeline joint coating, in particular to a joint coating process method of an anti-corrosion oil pipe, the anti-corrosion oil pipe and units thereof.
Background
The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.
With the high-speed development of economy, the demand of China for petroleum is continuously increased. The drilling and production development speed of the oil fields is faster and faster, and certain oil fields gradually enter the middle and later stages of development, so that the corrosion of high-water-content and H 2S、CO2 corrosion mediums on oil and gas pipelines is more serious. In order to solve the problems, lining oil pipes and chemical heat treatment anti-corrosion oil pipes (such as nitriding oil pipes and aluminizing oil pipes) are sequentially developed at home and abroad, and the anti-corrosion oil pipe bodies are effectively treated to achieve good anti-corrosion effects, but the problem of joint coating is not solved well all the time, so that the development of the anti-corrosion oil pipes is severely restricted.
Therefore, how to realize the repairing of the anti-corrosion oil pipe conveniently and rapidly with reliable performance is a technical problem to be solved urgently.
It should be noted that the foregoing description of the background art is only for the purpose of providing a clear and complete description of the technical solution of the present invention and is presented for the convenience of understanding by those skilled in the art. The above-described solutions are not considered to be known to the person skilled in the art simply because they are set forth in the background of the invention section.
Disclosure of Invention
Based on the defects in the prior art, the embodiment of the invention provides a port repairing process method of an anti-corrosion oil pipe, the anti-corrosion oil pipe and a unit thereof, which can realize port repairing of the anti-corrosion oil pipe with reliable performance, convenience and rapidness.
In order to achieve the above object, the present invention provides the following technical solutions.
A process method for repairing an anti-corrosion oil pipe comprises the following steps:
Acquiring a first pipe section and two second pipe sections, wherein the length of the first pipe section is longer than that of the second pipe section, and the corrosion resistance of the second pipe section is better than that of the first pipe section;
Friction welding is adopted to enable the two second pipe sections to be respectively and fixedly connected to the two ends of the first pipe section;
Performing chemical heat treatment on a tubular column formed by connecting the first pipe section and the second pipe section in series, so that at least an anti-corrosion layer is formed on the inner wall and the outer wall of the first pipe section;
Forming external threads on the outer walls of the end parts, far away from the first pipe sections, of the two second pipe sections; so far, one first pipe section and two second pipe sections which are connected in series form an anti-corrosion oil pipe unit;
Repeating the steps to obtain a plurality of anti-corrosion oil pipe units;
Adopting a tubing coupling to connect a plurality of the anti-corrosion tubing units in series to obtain the anti-corrosion tubing; the material of the oil pipe coupling is the same as that of the second pipe section, an inner wall of the oil pipe coupling is processed to form an inner thread matched with the outer thread, and the inner thread is screwed with the outer thread to realize connection of adjacent anti-corrosion oil pipe units.
Preferably, the first pipe section is made of N80Q steel grade, and the second pipe section is made of L80-13Cr.
Preferably, in the step of fixedly connecting the two second pipe sections to the two ends of the first pipe section by friction welding, the first pipe section is clamped in a moving clamp, the second pipe section is clamped in a rotating clamp, a sliding table carries the moving clamp clamping the first pipe section to move towards the rotating clamp, then the rotating clamp drives the second pipe section to rotate at a rotating speed of 0.6-6 m/s, and friction heat generation is started after the moving clamp moves until the end part of the first pipe section contacts with the end part of the second pipe section; and when the friction is over a first preset time period or the friction shortening amount reaches a set value, stopping rotating the rotary clamp, applying upsetting force of 20-200 MPa to the first pipe section and/or the second pipe section and maintaining the upsetting force for a second preset time period, releasing the second pipe section by loosening the rotary clamp, backing the sliding table to an original position, and releasing the first pipe section by loosening the movable clamp.
Preferably, in the step of chemical heat treatment, the chemical heat treatment is specifically aluminizing or nitriding the tubular string formed by connecting the first tubular segment and the second tubular segment in series, so as to form the corrosion-resistant layer.
Preferably, in the step of chemical heat treatment, a pipe column formed by connecting the first pipe section and the second pipe section in series is placed into a penetrating agent containing penetrating elements, the penetrating agent containing the penetrating elements is heated to 500-650 ℃, after a third preset time period is kept, the pipe column formed by connecting the first pipe section and the second pipe section in series is taken out, and then the pipe column formed by connecting the first pipe section and the second pipe section in series is placed into water at normal temperature for quenching.
Preferably, the anticorrosive layer comprises a pure aluminum layer formed on the outer surface of the first pipe section and an iron-aluminum alloy layer formed outside the pure aluminum layer; wherein,
The pure aluminum layer can form a compact aluminum oxide film under the corrosive medium, so that the corrosive medium is isolated outside the base material of the first pipe section;
The iron-aluminum alloy layer generates a spinel structure Al 2FeO4 compound in an oxidation process after the pure aluminum layer is consumed, and the spinel structure Al 2FeO4 compound can prevent atoms of a corrosion medium from contacting with iron atoms in a base material of the first pipe section.
A corrosion resistant tubing unit comprising: the anti-corrosion device comprises a first pipe section and two second pipe sections, wherein the length of the first pipe section is larger than that of the second pipe section, the anti-corrosion performance of the second pipe section is better than that of the first pipe section, the two second pipe sections are respectively and fixedly connected to the two ends of the first pipe section through friction welding, anti-corrosion layers are formed on the inner wall and the outer wall of the first pipe section, and external threads are arranged on the outer wall of the end part of the second pipe section, which is far away from the first pipe section; the anticorrosive layer is formed by aluminizing or nitriding a tubular column formed by connecting the first pipe section and the second pipe section in series; the anticorrosive coating comprises a pure aluminum layer formed on the outer surface of the first pipe section and an iron-aluminum alloy layer formed outside the pure aluminum layer; wherein,
The pure aluminum layer can form a compact aluminum oxide film under the corrosive medium, so that the corrosive medium is isolated outside the base material of the first pipe section;
The iron-aluminum alloy layer generates a spinel structure Al 2FeO4 compound in an oxidation process after the pure aluminum layer is consumed, and the spinel structure Al 2FeO4 compound can prevent atoms of a corrosion medium from contacting with iron atoms in a base material of the first pipe section.
Preferably, the first pipe section is made of N80Q steel grade, and the second pipe section is made of L80-13Cr.
An anti-corrosion oil pipe comprising:
a plurality of anti-corrosion tubing units as described in any one of the above;
the inner wall of the oil pipe coupling is provided with an internal thread matched with the external thread, and the internal thread is screwed with the external thread to realize connection of adjacent anti-corrosion oil pipe units.
Preferably, the material of the tubing coupling is the same as the material of the second pipe section.
According to the port repairing process method of the anti-corrosion oil pipe, the anti-corrosion oil pipe and the unit thereof, the first pipe section with the longer length but the weaker anti-corrosion performance is selected as the main body of the anti-corrosion oil pipe and the unit thereof, so that the cost is reduced, the second pipe section with the shorter length but the better anti-corrosion performance is selected as the end part of the anti-corrosion oil pipe unit, the butt joint of the first pipe section and the second pipe section with the weaker welding performance is realized by adopting friction welding, and the pipe column formed by connecting the first pipe section and the second pipe section in series is subjected to chemical heat treatment, so that anti-corrosion layers are formed on at least the inner wall and the outer wall of the first pipe section. Therefore, the external threads are machined on the outer wall of the second pipe section serving as the end part of the anti-corrosion oil pipe unit, the anti-corrosion layer of the outer wall of the first pipe section is not damaged, and the second pipe section has better anti-corrosion performance due to the self-property of the second pipe section, so that the obtained anti-corrosion oil pipe unit and the anti-corrosion oil pipe spliced by the anti-corrosion oil pipe unit can ensure excellent anti-corrosion performance.
Practice proves that the port repairing process method for the anti-corrosion oil pipe, the anti-corrosion oil pipe and the units thereof have the following beneficial effects compared with the prior art:
(1) The existing chemical heat treatment anti-corrosion oil pipe is not subjected to joint coating treatment, so that the end part of the oil pipe becomes a part with serious corrosion. According to the invention, the second pipe section with better anti-corrosion performance is arranged as the end part of the anti-corrosion oil pipe unit, and the anti-corrosion layers are formed on the inner wall and the outer wall of the first pipe section with weaker anti-corrosion performance through chemical heat treatment, so that the anti-corrosion problem of the oil pipe port is effectively solved;
(2) The first pipe section and the second pipe section with weaker welding performance are connected in a friction welding mode, 100% of connection strength is achieved, and the strength requirements of the finally obtained anti-corrosion oil pipe and units thereof are guaranteed;
(3) Standard threads are turned on the outer wall of the second pipe section, the field operation mode is not changed, and the continuity of the operation mode is ensured.
Specific embodiments of the invention are disclosed in detail below with reference to the following description and the accompanying drawings, indicating the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the invention are not limited in scope thereby. The embodiments of the invention include many variations, modifications and equivalents within the spirit and scope of the appended claims.
Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments in combination with or instead of the features of the other embodiments.
It should be emphasized that the term "comprises/comprising" when used herein is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.
Drawings
The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes, proportional sizes, and the like of the respective components in the drawings are merely illustrative for aiding in understanding the present invention, and are not particularly limited. Those skilled in the art with access to the teachings of the present invention can select a variety of possible shapes and scale sizes to practice the present invention as the case may be. In the drawings:
FIG. 1 is a flow chart of a method for repairing an anti-corrosion oil pipe according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an anti-corrosion oil pipe unit according to an embodiment of the present invention;
fig. 3 is a schematic diagram of an assembly structure of an anti-corrosion tubing unit and a tubing coupling according to an embodiment of the present invention.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, shall fall within the scope of the invention.
It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Fig. 1 is a flowchart of a process method for repairing an anti-corrosion oil pipe according to an embodiment of the present application. Although the present application provides method operational steps as described in the following embodiments or flowcharts, more or fewer operational steps may be included in the method, either on a routine or non-inventive basis. In addition, in the steps of the method, which logically do not have a necessary causal relationship, the execution order of the steps is not limited to the execution order provided in the embodiment of the present application. The joint coating process method comprises the following steps:
Step S10: acquiring a first pipe section and two second pipe sections, wherein the length of the first pipe section is longer than that of the second pipe section, and the corrosion resistance of the second pipe section is better than that of the first pipe section;
Step S20: friction welding is adopted to enable the two second pipe sections to be respectively and fixedly connected to the two ends of the first pipe section;
Step S30: performing chemical heat treatment on a tubular column formed by connecting the first pipe section and the second pipe section in series, so that at least an anti-corrosion layer is formed on the inner wall and the outer wall of the first pipe section;
Step S40: forming external threads on the outer walls of the end parts, far away from the first pipe sections, of the two second pipe sections; so far, one first pipe section and two second pipe sections which are connected in series form an anti-corrosion oil pipe unit;
Step S50: repeating the steps to obtain a plurality of anti-corrosion oil pipe units;
Step S60: adopting a tubing coupling to connect a plurality of the anti-corrosion tubing units in series to obtain the anti-corrosion tubing; the material of the oil pipe coupling is the same as that of the second pipe section, an inner wall of the oil pipe coupling is processed to form an inner thread matched with the outer thread, and the inner thread is screwed with the outer thread to realize connection of adjacent anti-corrosion oil pipe units.
In step S10, the first pipe section constitutes the main body of the anticorrosion oil pipe unit or anticorrosion oil pipe, and thus its length is configured longer. Specifically, the length of the first pipe section is 7000-10000mm, and the length of the second pipe section is 150-300mm. Meanwhile, the anti-corrosion performance of the pipe is weaker than that of the second pipe section due to the consideration of cost reduction. Based on the two points, the material of the first pipe section is selected as N80Q steel grade, and the material of the second pipe section is selected as L80-13Cr.
Generally, the unit price of the second pipe section made of L80-13Cr material is 10 times that of the first pipe section made of N80Q steel grade, and the service life of the second pipe section made of L80-13Cr material is 5-6 times that of the first pipe section made of N80Q steel grade. It follows that the first pipe section made of N80Q steel grade has a great cost advantage, but its disadvantages in terms of service life are also evident.
In view of this, the outer surface (inner and outer walls) of the first pipe section made of N80Q steel grade is formed with an anti-corrosion layer by chemical heat treatment. The practical application proves that the service life of the first pipe section made of the N80Q steel grade can reach the service life equivalent to or even equal to that of the second pipe section made of the L80-13Cr material after the chemical heat treatment in the step S30, but the cost is still far lower than that of the second pipe section made of the L80-13Cr material (about 1/3 of the unit price of the second pipe section made of the L80-13Cr material only). Therefore, the anti-corrosion oil pipe and the unit thereof manufactured by adopting the technical scheme of the embodiment of the invention have the advantages of taking into consideration the requirements of cost and service life, have obvious economic value and are beneficial to large-area popularization and application.
Further, the welding of the N80Q steel grade and the L80-13Cr material is poor, and the predetermined welding strength is difficult to ensure by adopting the traditional welding technology. In view of this, the embodiment of the present invention employs a special welding technique, such as friction welding, to achieve the butt joint of the first pipe section and the second pipe section.
In this embodiment, the specific step of using friction welding to fixedly butt-joint the two second pipe sections to the two ends of the first pipe section is to clamp the first pipe section in a moving clamp and clamp the second pipe section in a rotating clamp. After the first pipe section and the second pipe section are clamped, the moving clamp on the sliding table moves along with the sliding table, so that the first pipe section is carried to move towards the rotating clamp or the second pipe section. After the movable clamp moves to a certain distance, the rotary clamp drives the second pipe section to start rotating at a rotating speed of 0.6-6 m/s, and friction heat generation is started after the movable clamp moves to the position that the end part of the first pipe section is contacted with the end part of the second pipe section.
And stopping rotating the rotating clamp when the friction is over a first preset time period or the friction shortening amount reaches a set value. And applying upsetting force of 20-200 MPa to the first pipe section and/or the second pipe section and maintaining the upsetting force for a second preset time, releasing the second pipe section by the rotary clamp, backing the sliding table to the original position, and releasing the first pipe section by the movable clamp.
The first predetermined time period, the second predetermined time period, the set value and the third predetermined time period mentioned below are specific to the actual situation, which is not limited in the embodiment of the present invention. The friction welding has the advantages of wide welding performance requirements on workpieces to be welded, high welding dimensional accuracy, good welding seam quality, compact structure, high bonding strength and the like, so that the friction welding is suitable for mass production. The strength experiment report after welding the first pipe section made of the N80Q steel grade and the second pipe section made of the L80-13Cr material judges that the strength of the welding seam at the end part of the first pipe section and the second pipe section even exceeds the strength of the first pipe section made of the N80Q steel grade, thereby meeting the requirement of the actual working condition on the strength of the oil pipe.
In view of the foregoing, the second pipe section has a corrosion resistance superior to that of the first pipe section, and thus the pipe string formed by connecting the first pipe section and the second pipe section in series is subjected to chemical heat treatment, which is mainly aimed at providing the corrosion resistance of the first pipe section. Of course, the chemical heat treatment is performed to form an anti-corrosion layer on the inner and outer walls of the first pipe section, and at the same time, an anti-corrosion layer is also formed on the inner and outer walls of the second pipe section.
In this embodiment, chemical heat treatment is performed on the pipe string formed by connecting the first pipe section and the second pipe section in series, specifically, aluminizing or nitriding treatment is performed on the pipe string formed by connecting the first pipe section and the second pipe section in series, so as to form an anti-corrosion layer. The specific operation steps are that the pipe column formed by connecting the first pipe section and the second pipe section in series is placed into a penetrating agent containing penetrating elements (preferably nitrogen or aluminum), the penetrating agent containing the penetrating elements is heated to 500-650 ℃, after the third preset time period is kept, the pipe column formed by connecting the first pipe section and the second pipe section in series is taken out, and then the pipe column formed by connecting the first pipe section and the second pipe section in series is placed into water at normal temperature for quenching. After the treatment, the first pipe section and the second pipe section are of a quenching and tempering structure.
In a preferred embodiment, the corrosion protection layer is an aluminized layer. Specifically, the anti-corrosion layer comprises a pure aluminum layer formed on the outer surface of the first pipe section and an iron-aluminum alloy layer formed outside the pure aluminum layer. The pure aluminum layer can form a compact aluminum oxide film under the corrosive medium, so that the corrosive medium is isolated from the base material of the first pipe section, and the corrosion prevention effect is achieved. And the pure aluminum layer has the automatic oxidation repairing capability, so that the integrity of the aluminum oxide film can be ensured.
After the pure aluminum layer is consumed, the iron-aluminum alloy layer can generate a spinel-structure Al 2FeO4 compound in the oxidation process, and the spinel-structure Al 2FeO4 compound has high stacking density and no vacancy and defect. Not only can prevent oxidation, but also can prevent atoms of the corrosive medium from contacting with iron atoms in the base material of the first pipe section, and corrosion products can not be formed, thereby achieving the aim of corrosion prevention.
Because the anti-corrosion performance of the second pipe section is better than that of the first pipe section, when the outer wall of the second pipe section is formed into external threads through turning, the anti-corrosion performance of the second pipe section is not affected even if the anti-corrosion layer on the outer wall of the second pipe section is damaged.
This is also the reason for the embodiment of the invention using a second pipe section with better corrosion resistance. If the conventional technology is adopted, the oil pipe with poor corrosion resistance is directly subjected to chemical heat treatment for corrosion resistance. Then, when the external thread is machined later on, the anti-corrosion layer of the outer wall of the oil pipe subjected to anti-corrosion treatment is damaged, so that the anti-corrosion performance of the port of the oil pipe is poor.
In the embodiment of the invention, the second pipe section with better anti-corrosion performance is adopted, and then the two second pipe sections are fixedly connected with the two ends of the first pipe section after anti-corrosion treatment through friction welding, so that the two ends of the anti-corrosion oil pipe unit can be formed. Thus, even if the external threads are formed on the outer walls of the two second pipe sections in a subsequent processing mode, the anti-corrosion layer of the outer wall of the first pipe section is not damaged, and the second pipe section has better anti-corrosion performance due to the self-properties of the second pipe section, so that the obtained anti-corrosion oil pipe unit and the anti-corrosion oil pipe spliced by the anti-corrosion oil pipe unit can be guaranteed to have excellent anti-corrosion performance.
Further, since the anti-corrosion tubing unit needs to be docked to form an anti-corrosion tubing by tubing couplings, the tubing couplings need to be connected to the second pipe section by threads. Therefore, the inner wall of the tubing coupling also needs to be formed with internal threads that mate with the external threads of the outer wall of the second pipe section.
The requirement of corrosion prevention is also met, and in order to not lose the corrosion resistance when the oil pipe coupling is processed to form the internal thread, the oil pipe coupling is made of the same material as the second pipe section, namely L80-13 Cr. Therefore, the tubing coupling has better anti-corrosion performance, and even if the internal thread is processed to damage the inner wall of the end part, the anti-corrosion performance is not affected.
The embodiment of the invention also provides an anti-corrosion oil pipe manufactured by the joint coating process method and a unit thereof. As shown in fig. 2 and 3, the anticorrosion oil pipe unit 10 comprises: the anti-corrosion device comprises a first pipe section 1 and two second pipe sections 2, wherein the length of the first pipe section 1 is larger than that of the second pipe section 2, the anti-corrosion performance of the second pipe section 2 is superior to that of the first pipe section 1, the two second pipe sections 2 are respectively and fixedly connected to the two ends of the first pipe section 1 through friction welding, anti-corrosion layers (not shown) are formed on the inner wall and the outer wall of the first pipe section 1, and external threads (not shown) are arranged on the outer wall of the end part of the second pipe section 2, far away from the first pipe section 1.
In the present embodiment, a friction weld 3 is formed between the end portions of the two second pipe sections 2 that are butted against the first pipe section 1, and the second pipe section 2 is butted against the first pipe section 1 through the friction weld 3.
In this embodiment, the first pipe section 1 is made of N80Q steel grade, and the second pipe section 2 is made of L80-13Cr. The anticorrosive layer is formed by aluminizing or nitriding the pipe column formed by connecting the first pipe section 1 and the second pipe section 2 in series. In a preferred embodiment, the corrosion protection layer is an aluminized layer comprising a layer of pure aluminum formed on the outer surface of the first pipe section 1 and a layer of iron-aluminum alloy formed outside the layer of pure aluminum.
As shown in fig. 2 and 3, the anti-corrosion oil pipe according to the embodiment of the present invention includes: a plurality of anticorrosive oil pipe units 10 as described in the above embodiments; and the inner walls of the plurality of oil pipe couplings are provided with internal threads matched with the external threads, and the internal threads are screwed with the external threads so as to realize the connection of the adjacent anti-corrosion oil pipe units 10. Preferably, the tubing collar is of the same material as the second pipe section 2.
The present invention is limited to the description of the method of repairing the joint, and details thereof are not repeated herein.
According to the port repairing process method of the anti-corrosion oil pipe, the anti-corrosion oil pipe and the unit thereof, the first pipe section 1 with the longer length but the weaker anti-corrosion performance is selected as the main body of the anti-corrosion oil pipe and the unit thereof, so that the cost is reduced, the second pipe section 2 with the shorter length but the better anti-corrosion performance is selected as the end part of the anti-corrosion oil pipe unit 10, the butt joint of the first pipe section 1 and the second pipe section 2 with the weaker welding performance is realized by adopting friction welding, and the pipe column formed by connecting the first pipe section 1 and the second pipe section 2 in series is subjected to chemical heat treatment, so that anti-corrosion layers are formed on at least the inner wall and the outer wall of the first pipe section 1. In this way, the external thread is subsequently processed on the outer wall of the second pipe section 2 serving as the end part of the anti-corrosion oil pipe unit 10, and the anti-corrosion layer of the outer wall of the first pipe section 1 is not damaged, and the second pipe section 2 has better anti-corrosion performance due to the self-property, so that the obtained anti-corrosion oil pipe unit 10 and the anti-corrosion oil pipe spliced by using the anti-corrosion oil pipe unit 10 can ensure excellent anti-corrosion performance.
Practice proves that the port repairing process method for the anti-corrosion oil pipe, the anti-corrosion oil pipe and the units thereof have the following beneficial effects compared with the prior art:
(1) The existing chemical heat treatment anti-corrosion oil pipe is not subjected to joint coating treatment, so that the end part of the oil pipe becomes a part with serious corrosion. According to the invention, the second pipe section 2 with better corrosion resistance is arranged as the end part of the corrosion-resistant oil pipe unit 10, and corrosion-resistant layers are formed on the inner wall and the outer wall of the first pipe section 1 with weaker corrosion resistance at least through chemical heat treatment, so that the problem of corrosion resistance of an oil pipe port is effectively solved;
(2) The first pipe section 1 and the second pipe section 2 with weaker welding performance are connected in a friction welding mode, 100% of connection strength is achieved, and the strength requirements of the finally obtained anti-corrosion oil pipe and units thereof are guaranteed;
(3) Standard threads are turned on the outer wall of the second pipe section 2, the field operation mode is not changed, and the continuity of the operation mode is ensured.
It should be noted that, in the description of the present invention, the terms "first," "second," and the like are used for descriptive purposes only and to distinguish between similar objects, and there is no order of preference between them, nor should they be construed as indicating or implying relative importance. Furthermore, in the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
Any numerical value recited herein includes all values of the lower and upper values that increment by one unit from the lower value to the upper value, as long as there is a spacing of at least two units between any lower value and any higher value. For example, if it is stated that the number of components or the value of a process variable (e.g., temperature, pressure, time, etc.) is from 1 to 90, preferably from 21 to 80, more preferably from 30 to 70, then the purpose is to explicitly list such values as 15 to 85, 22 to 68, 43 to 51, 30 to 32, etc. in this specification as well. For values less than 1, one unit is suitably considered to be 0.0001, 0.001, 0.01, 0.1. These are merely examples that are intended to be explicitly recited in this description, and all possible combinations of values recited between the lowest value and the highest value are believed to be explicitly stated in the description in a similar manner.
Unless otherwise indicated, all ranges include endpoints and all numbers between endpoints. "about" or "approximately" as used with a range is applicable to both endpoints of the range. Thus, "about 20 to 30" is intended to cover "about 20 to about 30," including at least the indicated endpoints.
It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided will be apparent to those of skill in the art upon reading the above description. The scope of the present teachings should, therefore, be determined not with reference to the above description, but instead should be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are incorporated herein by reference for the purpose of completeness. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended to forego such subject matter, nor should the applicant be deemed to have such subject matter not considered to be part of the disclosed subject matter.
Claims (7)
1. The port repairing process method for the anti-corrosion oil pipe is characterized by comprising the following steps of:
Acquiring a first pipe section and two second pipe sections, wherein the length of the first pipe section is longer than that of the second pipe section, and the corrosion resistance of the second pipe section is better than that of the first pipe section; the first pipe section is made of N80Q steel grade, and the second pipe section is made of L80-13Cr;
Friction welding is adopted to enable the two second pipe sections to be respectively and fixedly connected to the two ends of the first pipe section;
Performing chemical heat treatment on a tubular column formed by connecting the first tubular section and the second tubular section in series: placing a pipe column formed by connecting the first pipe section and the second pipe section in series into a penetrating agent containing penetrating elements, heating the penetrating agent containing the penetrating elements to 500-650 ℃, keeping the temperature for a third preset time, taking out the pipe column formed by connecting the first pipe section and the second pipe section in series, and then placing the pipe column formed by connecting the first pipe section and the second pipe section in series into normal-temperature water for quenching, so that at least an anti-corrosion layer is formed on the inner wall and the outer wall of the first pipe section; the anticorrosive coating comprises a pure aluminum layer formed on the outer surface of the first pipe section and an iron-aluminum alloy layer formed outside the pure aluminum layer;
Wherein the pure aluminum layer can form a compact aluminum oxide film under the corrosive medium, so that the corrosive medium is isolated outside the base material of the first pipe section; generating a spinel-structure Al 2FeO4 compound in an oxidation process after the pure aluminum layer is consumed, wherein the spinel-structure Al 2FeO4 compound can prevent atoms of a corrosion medium from contacting with iron atoms in a base material of the first pipe section;
Forming external threads on the outer walls of the end parts, far away from the first pipe sections, of the two second pipe sections; so far, one first pipe section and two second pipe sections which are connected in series form an anti-corrosion oil pipe unit;
Repeating the steps to obtain a plurality of anti-corrosion oil pipe units;
Adopting a tubing coupling to connect a plurality of the anti-corrosion tubing units in series to obtain the anti-corrosion tubing; the material of the oil pipe coupling is the same as that of the second pipe section, an inner wall of the oil pipe coupling is processed to form an inner thread matched with the outer thread, and the inner thread is screwed with the outer thread to realize connection of adjacent anti-corrosion oil pipe units.
2. The method for repairing an anti-corrosion oil pipe according to claim 1, wherein in the step of fixedly connecting two second pipe sections to both ends of the first pipe section by friction welding, the first pipe section is clamped in a moving clamp, the second pipe section is clamped in a rotating clamp, a sliding table carries the moving clamp clamping the first pipe section to move towards the rotating clamp, then the rotating clamp drives the second pipe section to rotate at a rotating speed of 0.6-6 m/s, and friction heat generation is started after the moving clamp moves until the end of the first pipe section contacts with the end of the second pipe section; and when the friction is over a first preset time period or the friction shortening amount reaches a set value, stopping rotating the rotary clamp, applying upsetting force of 20-200 MPa to the first pipe section and/or the second pipe section and maintaining the upsetting force for a second preset time period, releasing the second pipe section by loosening the rotary clamp, backing the sliding table to an original position, and releasing the first pipe section by loosening the movable clamp.
3. The method for repairing an anti-corrosion oil pipe according to claim 1, wherein in the step of chemical heat treatment, the chemical heat treatment is specifically aluminizing or nitriding a pipe string formed by connecting the first pipe section and the second pipe section in series, thereby forming the anti-corrosion layer.
4. An anti-corrosion oil pipe unit, comprising: the anti-corrosion device comprises a first pipe section and two second pipe sections, wherein the length of the first pipe section is larger than that of the second pipe section, the anti-corrosion performance of the second pipe section is better than that of the first pipe section, the two second pipe sections are respectively and fixedly connected to the two ends of the first pipe section through friction welding, anti-corrosion layers are formed on the inner wall and the outer wall of the first pipe section, and external threads are arranged on the outer wall of the end part of the second pipe section, which is far away from the first pipe section; the anticorrosive layer is formed by aluminizing or nitriding a tubular column formed by connecting the first pipe section and the second pipe section in series; the anticorrosive coating comprises a pure aluminum layer formed on the outer surface of the first pipe section and an iron-aluminum alloy layer formed outside the pure aluminum layer; wherein,
The pure aluminum layer can form a compact aluminum oxide film under the corrosive medium, so that the corrosive medium is isolated outside the base material of the first pipe section;
The iron-aluminum alloy layer generates a spinel structure Al 2FeO4 compound in an oxidation process after the pure aluminum layer is consumed, and the spinel structure Al 2FeO4 compound can prevent atoms of a corrosion medium from contacting with iron atoms in a base material of the first pipe section.
5. The anti-corrosion oil pipe unit according to claim 4, wherein the first pipe section is made of a N80Q steel grade, and the second pipe section is made of L80-13Cr.
6. An anti-corrosion oil pipe, comprising:
a plurality of anticorrosive oil pipe units according to claim 4 or 5;
the inner wall of the oil pipe coupling is provided with an internal thread matched with the external thread, and the internal thread is screwed with the external thread to realize connection of adjacent anti-corrosion oil pipe units.
7. The anti-corrosion tubing of claim 6, wherein the tubing coupling is of the same material as the second tubing section.
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| CN201811414925.5A CN109372442B (en) | 2018-11-26 | 2018-11-26 | Joint coating process method of anti-corrosion oil pipe, anti-corrosion oil pipe and unit thereof |
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| CN201811414925.5A CN109372442B (en) | 2018-11-26 | 2018-11-26 | Joint coating process method of anti-corrosion oil pipe, anti-corrosion oil pipe and unit thereof |
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