CN111927335B - Preparation method of petroleum drilling pipe - Google Patents
Preparation method of petroleum drilling pipe Download PDFInfo
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- CN111927335B CN111927335B CN202010788589.1A CN202010788589A CN111927335B CN 111927335 B CN111927335 B CN 111927335B CN 202010788589 A CN202010788589 A CN 202010788589A CN 111927335 B CN111927335 B CN 111927335B
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- 238000005553 drilling Methods 0.000 title claims description 19
- 239000003208 petroleum Substances 0.000 title claims description 13
- 238000002360 preparation method Methods 0.000 title abstract description 6
- 238000005219 brazing Methods 0.000 claims abstract description 125
- 239000000945 filler Substances 0.000 claims abstract description 78
- 239000002184 metal Substances 0.000 claims abstract description 78
- 229910052751 metal Inorganic materials 0.000 claims abstract description 78
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 52
- 239000010959 steel Substances 0.000 claims abstract description 52
- 239000000956 alloy Substances 0.000 claims abstract description 50
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 49
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 42
- 239000007788 liquid Substances 0.000 claims abstract description 31
- 238000000034 method Methods 0.000 claims abstract description 25
- 238000001816 cooling Methods 0.000 claims abstract description 21
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 21
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 claims description 12
- 229910052759 nickel Inorganic materials 0.000 claims description 7
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 5
- 238000004321 preservation Methods 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 3
- 238000004506 ultrasonic cleaning Methods 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 2
- 238000003466 welding Methods 0.000 abstract description 15
- 230000008569 process Effects 0.000 abstract description 12
- 230000008602 contraction Effects 0.000 abstract description 4
- 230000002035 prolonged effect Effects 0.000 abstract description 4
- 239000000463 material Substances 0.000 description 9
- 238000002844 melting Methods 0.000 description 5
- 230000008018 melting Effects 0.000 description 5
- 239000002131 composite material Substances 0.000 description 4
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 229910000679 solder Inorganic materials 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000013329 compounding Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000881 depressing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910001105 martensitic stainless steel Inorganic materials 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000004881 precipitation hardening Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
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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
- B23K1/00—Soldering, e.g. brazing, or unsoldering
-
- 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
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/0008—Soldering, e.g. brazing, or unsoldering specially adapted for particular articles or work
-
- 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
- E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
- E21B17/1085—Wear protectors; Blast joints; Hard facing
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
- Drilling Tools (AREA)
Abstract
The invention provides a preparation method of an oil drill pipe, which belongs to the technical field of oil exploitation equipment, wherein before brazing, a hard alloy pipe is soaked in liquid nitrogen for cooling, the principle of expansion with heat and contraction with cold is utilized, after the liquid nitrogen is cooled at ultralow temperature, the volume of the hard alloy pipe can shrink, and after the hard alloy pipe is installed on a steel pipe, the volume of the hard alloy pipe can expand when the temperature rises to the normal temperature, and is restrained by the steel pipe to generate outward tension, so that the liquid brazing filler metal can not run off in the vacuum brazing process, no gap can be formed between the steel pipe and the hard alloy pipe, and the welding quality is ensured. By the mode, the connection strength between the steel pipe and the hard alloy pipe is greatly improved, so that the service life of the oil drill pipe is prolonged, and the quality stability of the oil drill pipe is improved.
Description
Technical Field
The invention relates to the technical field of oil exploitation equipment, in particular to a preparation method of an oil drill pipe.
Background
The oil drill pipe is used for oil and geological drilling. When the oil drilling pipe works, under the action of stress such as tension, compression, torsion, impact load and the like, the pipe wall is abraded by mud and rock particles, so that the pipe is required to have enough strength, hardness, wear resistance and impact toughness.
In the use process of the traditional steel structure petroleum drill pipe, the petroleum drill pipe is easy to damage under the severe working condition, therefore, the petroleum drill pipe adopts a structure of combining steel and hard alloy steel, the hard alloy has the advantages of high hardness, wear resistance, corrosion resistance and the like, and the steel and hard alloy composite drill pipe can improve the wear resistance and realize the combination of high hardness, high wear resistance and good impact toughness.
The traditional connection of the hard alloy and steel composite drill pipe adopts a mechanical embedding connection method, namely, the hard alloy pipe is embedded into the steel pipe, and the combination is realized by means of mutual friction force. Although the mechanical mosaic connection can obtain certain connection strength, in the long-term use process, under the working conditions that the inner wall and the outer wall of the oil drill pipe are subjected to stress such as tension, compression and the like circularly, the separation of the hard alloy and the steel pipe is easy to occur, and the service life of the oil drill pipe is influenced.
Disclosure of Invention
The invention aims to provide a preparation method of an oil drill pipe, which can prolong the service life and improve the quality of the oil drill pipe.
The embodiment of the invention is realized by the following steps:
one aspect of an embodiment of the present invention provides a method of manufacturing an oil drill pipe, including filling a brazing filler metal into an outer pipe; wherein the outer pipe is a steel pipe; immersing the inner tube into liquid nitrogen for cooling according to preset cooling time; wherein the inner pipe is a hard alloy pipe; installing the inner pipe in the outer pipe, and enabling the brazing filler metal to be located between the outer pipe and the inner pipe to form a piece to be welded; and brazing the to-be-welded piece to form the petroleum drill pipe.
Optionally, immersing the inner tube into liquid nitrogen for cooling according to the preset cooling time; wherein, the inner tube includes for the carbide pipe: and immersing the inner tube in liquid nitrogen for 3-4 min.
Optionally, the outer tube is filled with brazing filler metal; wherein, the outer tube includes for the steel pipe: and filling nickel-based brazing filler metal in the outer pipe.
Optionally, the brazing filler metal is a sheet brazing filler metal, and filling the brazing filler metal into the outer pipe includes: and rolling the brazing filler metal into a cylinder shape, and placing the cylinder-shaped brazing filler metal in the outer tube, so that the outer wall of the brazing filler metal is attached to the inner wall of the outer tube.
Optionally, installing the inner tube within the outer tube with the braze material between the outer tube and the inner tube, forming the part to be welded comprising: and installing the inner tube in the cylinder of the brazing filler metal, and enabling the inner wall of the brazing filler metal to be attached to the outer wall of the inner tube.
Optionally, the brazing the to-be-welded piece to form the oil drill pipe includes: placing the to-be-welded piece in a brazing furnace, vacuumizing and heating; heating to a preset temperature at a preset heating speed, and then preserving heat according to heat preservation time; cooling to 100 ℃ along with the furnace; and taking out the petroleum drilling pipe to form a finished product.
Optionally, filling brazing filler metal in the outward pipe; before the outer pipe is a steel pipe, the method comprises the following steps: cleaning the outer tube and the inner tube; and drying the outer pipe and the inner pipe.
Optionally, said cleaning said outer tube and said inner tube comprises: and placing the outer tube and the inner tube in an acetone solution for ultrasonic cleaning.
The embodiment of the invention has the beneficial effects that:
according to the preparation method of the oil drill pipe, before brazing, the hard alloy pipe is soaked in liquid nitrogen for cooling, the principle of expansion with heat and contraction with cold is utilized, after the hard alloy pipe is cooled at ultralow temperature by the liquid nitrogen, the volume of the hard alloy pipe can shrink, and after the hard alloy pipe is installed on a steel pipe, the volume of the hard alloy pipe can expand when the temperature rises to the normal temperature, and the hard alloy pipe is restrained by the steel pipe to generate outward tension, so that the liquid brazing filler metal cannot be lost in the vacuum brazing process, no gap can be formed between the steel pipe and the hard alloy pipe, and the welding quality is ensured. By the mode, the connection strength between the steel pipe and the hard alloy pipe is greatly improved, so that the service life of the oil drill pipe is prolonged, and the quality stability of the oil drill pipe is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic diagram of an oil drill pipe configuration provided by an embodiment of the present invention;
FIG. 2 is a flow chart of a method for manufacturing an oil drill pipe according to an embodiment of the present invention;
fig. 3 is a second flow chart of the method for manufacturing an oil drill pipe according to the embodiment of the present invention.
10-oil drill pipe; 11-an outer tube; 12-a brazing layer; 13-inner tube.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are absolutely horizontal or hanging, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The oil drill pipe 10 is used for oil and geological drilling and has extremely complicated working conditions. When the oil drilling pipe 10 works, under the action of stress such as tension, compression, torsion, impact load and the like, the pipe wall is easily abraded by mud and rock particles, so that the pipe is required to have enough strength, hardness, wear resistance and impact toughness.
In the use process of the traditional steel structure petroleum drill pipe, the damage is easy to occur under the complex and severe working condition. Therefore, a steel and cemented carbide composite drill pipe has been proposed, which has high wear resistance, high hardness, high wear resistance, good impact toughness and the like because cemented carbide has high hardness, wear resistance and corrosion resistance.
In the prior art, the connection of the petroleum drill pipe compounded by hard alloy and steel adopts a mechanical embedding connection method, namely, the hard alloy pipe is embedded into the steel pipe, and the combination is realized by means of mutual friction force. Although the mechanical embedding connection can obtain certain connection strength, in the long-term use process, under the working conditions that the inner wall and the outer wall of the drill pipe are subjected to stresses such as tension and compression in a circulating manner, the situation that the hard alloy is separated from the steel pipe easily occurs, and the service life of the petroleum drill pipe is influenced.
In order to solve the above problems, the present embodiment provides an oil drill pipe 10 and a manufacturing method thereof, in which a hard alloy and a steel pipe are connected by brazing, so that the connection strength of the oil drill pipe 10 formed by compounding the hard alloy and the steel is greatly improved, and the service life and the quality stability of the oil drill pipe 10 are improved.
Example one
Referring to fig. 1, the present embodiment provides an oil drilling pipe 10, which includes an outer pipe 11 and an inner pipe 13 sleeved in the outer pipe 11, wherein the outer pipe 11 and the inner pipe 13 are connected by a brazing layer 12, the outer pipe 11 is made of steel, and the inner pipe 13 is made of hard alloy.
The outer pipe 11 is made of steel materials, and the outer pipe 11 is a steel pipe; the inner tube 13 is made of hard alloy material, and the inner tube 13 is a hard alloy tube.
The outer pipe 11 and the inner pipe 13 are connected by a brazing layer 12, that is, the outer pipe 11 and the inner pipe 13 are fixedly connected by brazing. And vacuum brazing is employed.
It should be noted that, before the inner tube 13 is brazed with the outer tube 11, the inner tube 13 (cemented carbide tube) needs to be soaked in liquid nitrogen for cooling, and by using the principle of expansion with heat and contraction with cold, after the liquid nitrogen is cooled at ultralow temperature, the volume of the cemented carbide tube can be shrunk, and after the cemented carbide tube is mounted on the outer tube 11 (steel tube), the volume of the cemented carbide tube can be expanded when the temperature is raised to normal temperature, so as to generate outward tension, and ensure that the outer tube 11 and the inner tube 13 are tightly combined, thereby ensuring that no gap can be generated between the outer tube 11 and the inner tube 13 in the vacuum brazing process, and ensuring the welding quality.
The oil drilling pipe 10 provided by the embodiment of the invention comprises an outer pipe 11 and an inner pipe 13, wherein the inner pipe 13 is sleeved in the outer pipe 11, the inner pipe 13 is connected with the outer pipe 11 through brazing, the outer pipe 11 is a steel pipe, and the inner pipe 13 is a hard alloy pipe. Before brazing, the hard alloy pipe is soaked in liquid nitrogen for cooling, the hard alloy pipe can shrink in volume after being cooled at ultralow temperature by using the principle of expansion with heat and contraction with cold, and then the hard alloy pipe can expand in volume when the temperature rises to normal temperature after being installed on the steel pipe and is restrained by the steel pipe to generate outward tension, so that the liquid brazing filler metal cannot run off in the vacuum brazing process, a gap cannot be formed between the steel pipe and the hard alloy pipe, and the welding quality is ensured. By the mode, the connection strength between the steel pipe and the hard alloy pipe is greatly improved, so that the service life of the oil drilling pipe 10 is prolonged, and the quality stability of the oil drilling pipe is improved.
Specifically, the brazing filler metal during the brazing of the steel pipe and the hard alloy pipe is nickel-based brazing filler metal, namely BNi2, and the brazing layer 12 formed after the brazing is the nickel-based brazing layer 12.
BNi2 is one of nickel-based solders, which mainly contains Ni as a main component element, and secondly contains melting point depressing elements (B) and Si, and other elements. The brazing filler metal is commonly used for brazing stainless steel and is the preferred brazing filler metal when materials such as martensitic stainless steel, austenitic stainless steel, precipitation hardening high-temperature alloy and the like are used as base materials. The brazing filler metal may be in the form of rods, foil strips, powder, etc.
The BNi2 solder is a most widely used nickel-based solder, and has a lower melting temperature and better wettability during the brazing process, so that the BNi2 is selected as the solder in this embodiment, so that the brazing layer 12 (the brazing joint) formed by brazing has better high-temperature strength, excellent oxidation resistance and corrosion resistance, and the overall performance of the oil drill pipe 10 is improved.
In addition, the brazing filler metal in this embodiment is a sheet-shaped brazing filler metal, and in the brazing process, the sheet-shaped brazing filler metal is melted into a liquid state to fill a gap between the steel pipe and the hard alloy pipe, so that the oil drill pipe 10 is formed.
Adopt the sheet brazing filler metal, compare conventional paste brazing filler metal and can scribble inhomogeneous condition, the homogeneity of brazing filler metal can be guaranteed to the sheet brazing filler metal and the installation is simpler, and is convenient, only need with the sheet brazing filler metal batching tubulose put into outer tube 11, put inner tube 13 in the tubulose sheet brazing filler metal of batching again can.
Example two
As shown in fig. 2 and 3, the present embodiment provides a method of manufacturing an oil drill pipe 10, the method including:
s100-1: the outer tube 11 and the inner tube 13 are cleaned.
Before brazing, the surfaces of the outer pipe 11 and the inner pipe 13 need to be cleaned, the inner pipe 13 (a hard alloy pipe) and the outer pipe 11 (a steel pipe) are placed in an acetone solution, ultrasonic cleaning is adopted for two minutes, then the outer pipe 11 and the inner pipe 13 are dried by a blower, and brazing is carried out.
S100: filling brazing filler metal into the outer tube 11; wherein, the outer pipe 11 is a steel pipe.
The brazing filler metal is nickel-based brazing filler metal, and the brazing filler metal is sheet brazing filler metal.
When filling, firstly, the brazing filler metal is cut according to the length of the perimeter of the inner diameter of the outer pipe 11 (steel pipe), then the brazing filler metal is rolled into a cylinder shape and placed in the outer pipe 11, and the outer wall of the cylindrical brazing filler metal is attached to the inner wall of the outer pipe 11.
Subsequently, the inner tube 13 is sleeved in the cylindrical brazing filler metal, so that the outer wall of the inner tube 13 is attached to the inner wall of the brazing filler metal.
In the prior art, the brazing filler metal for brazing is generally paste-shaped brazing filler metal, the paste-shaped brazing filler metal is in a smearing mode, but the paste-shaped brazing filler metal can be unevenly smeared, so that the thicknesses of welding layers formed after brazing are different, and the welding layer connection strength of a thin part is weak.
The embodiment adopts the sheet brazing filler metal, the thickness of the sheet brazing filler metal is consistent, the uniformity of the brazing filler metal can be ensured, and the installation is convenient and simple.
S110: immersing the inner tube 13 into liquid nitrogen for cooling according to the preset cooling time; wherein, the inner pipe 13 is a hard alloy pipe.
The preset time is 3min to 4min, the inner tube 13 is immersed in liquid nitrogen for 3min to 4min so as to cool the inner tube 13, and then the inner tube 13 is taken out to be brazed.
The purpose of the cooling is to ensure that there is no gap between the inner tube 13 and the outer tube 11 after subsequent brazing.
Soak inner tube 13 (carbide pipe) in liquid nitrogen before welding and cool off, utilize the principle of expend with heat and contract with cold, after liquid nitrogen ultra-low temperature cooling, carbide pipe volume can contract, when installing outer tube 11 (steel pipe) back temperature rise to the normal atmospheric temperature, carbide pipe volume can expand, can receive the restraint of steel pipe, produce outside tension, braze under this state, the temperature rise can just can not produce the gap between two kinds of materials of outer tube 11 and inner tube 13, the brazing filler metal melting is liquid during braze, liquid brazing filler metal can not run off, thereby guaranteed that the gap can not appear between vacuum brazing in-process steel pipe and the carbide, guarantee both and combine closely, consequently, welding quality has been guaranteed.
If the conventional vacuum brazing is adopted, the hard alloy pipe is installed in the steel pipe at normal temperature, then a welded part is heated in the vacuum brazing process, because the thermal expansion coefficient of the steel pipe is almost equal to two times of that of the hard alloy pipe, the volume expansion of the steel pipe is large, the volume expansion of the hard alloy is small, so that two materials which are tightly combined at normal temperature can form a gap at high temperature, brazing filler metal is molten into liquid during brazing, once the gap is formed between the two materials, the liquid brazing filler metal can flow, the welding defect is caused to be generated on the part of a product, and the quality of the product is influenced. In the present embodiment, the inner tube 13 is cooled by liquid nitrogen before brazing, which solves the above problems.
S120: the inner tube 13 is installed in the outer tube 11 with the brazing filler metal between the outer tube 11 and the inner tube 13 to form a part to be welded.
And (3) cleaning and drying the inner pipe 13 and the outer pipe 11, wherein the inner pipe 13 is cooled by liquid nitrogen, and then the outer pipe 11 and the inner pipe 13 are brazed by brazing filler metal to finally form the petroleum drilling pipe 10.
Specifically, the inner tube 13 is installed in the outer tube 11 to form a part to be welded, the cylindrical brazing filler metal is already in the outer tube 11 at this time, the inner tube 13 is installed in the cylinder of the brazing filler metal, the outer wall of the inner tube 13 is attached to the inner wall of the brazing filler metal, and the outer wall of the brazing filler metal is attached to the inner wall of the outer tube 11.
S130: the parts to be welded are brazed to form the oil pipe 10.
Specifically, S131, the piece to be welded is placed in a brazing furnace and heated in a vacuumizing mode.
And S132, heating to a preset temperature at a preset heating speed, and then preserving the heat according to heat preservation time. Wherein the preset heating speed is 20 ℃/min, the preset temperature is 1050 ℃, the heat preservation time is 1 hour, and each parameter allows certain error.
And putting the to-be-welded piece into a brazing furnace, vacuumizing and heating, wherein the brazing filler metal is melted into liquid during heating, automatically flows into a gap between the outer pipe 11 and the inner pipe 13 by virtue of capillary action so as to fill the gap between the outer pipe 11 and the inner pipe 13, and forms a brazing layer 12 after cooling and solidification.
In addition, the vacuum brazing is adopted in the embodiment, because the to-be-welded piece is in a vacuum environment, oxidation and impurity pollution cannot occur, and the harmful influence of air on the to-be-welded piece can be effectively eliminated; the workpiece is heated uniformly, the deformation is small, a welding layer obtained after welding is bright and compact, and the welding layer has good mechanical property and corrosion resistance.
It should be noted that the preset temperature, i.e., the heating temperature, is higher than the melting point of the brazing filler metal and lower than the melting point of the base material (the outer tube 11 and the inner tube 13), so that the brazing filler metal is melted into a liquid state to fill the gap between the outer tube 11 and the inner tube 13, and at the same time, the base material is ensured not to be melted.
And S133, cooling to 100 ℃ along with the furnace.
S134, taking out the workpiece after the temperature of the workpiece is lower than 100 ℃, and completing welding to obtain the finished product of the petroleum drilling pipe 10.
In summary, the oil drilling pipe 10 provided in this embodiment adopts a vacuum brazing method to manufacture the composite oil drilling pipe 10 of the hard alloy pipe and the steel pipe, and the brazed joint (the brazing layer 12) has higher strength and quality stability compared with the conventional mechanical insert. In addition, in the embodiment, the method of cooling the cemented carbide pipe by using liquid nitrogen solves the problem that brazing cannot be performed due to different thermal expansion coefficients of steel and cemented carbide. In the embodiment, the hard alloy pipe is cooled by using liquid nitrogen before welding, the volume of the hard alloy pipe is reduced at low temperature, and after the hard alloy pipe is arranged in the steel pipe, when the temperature is gradually increased, the volume of the hard alloy pipe is increased and the hard alloy pipe is tightly combined with the steel pipe, so that the defect of low welding strength caused by different thermal expansion coefficients is overcome. Therefore, the connection strength of the oil drilling pipe 10 formed by compounding the hard alloy pipe and the steel pipe is greatly improved, so that the service life of the oil drilling pipe 10 is prolonged, and the quality stability of the oil drilling pipe is improved. In addition, the brazing filler metal used in the brazing process of the embodiment is sheet-shaped brazing filler metal, so that the uniformity of the brazing filler metal is guaranteed, and the brazing filler metal is simpler to mount.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A method of making an oil drill pipe, the method comprising:
filling brazing filler metal into the outer pipe; wherein the outer pipe is a steel pipe;
immersing the inner tube into liquid nitrogen for cooling according to preset cooling time; wherein the inner pipe is a hard alloy pipe;
installing the inner pipe in the outer pipe, and enabling the brazing filler metal to be located between the outer pipe and the inner pipe to form a piece to be welded;
brazing the to-be-welded piece to form an oil drill pipe;
immersing the inner tube into liquid nitrogen for cooling according to the preset cooling time; wherein, the inner tube includes for carbide pipe:
and immersing the inner tube in liquid nitrogen for 3-4 min.
2. The method of manufacturing an oil drill pipe according to claim 1, wherein the filler metal is filled in the outer pipe; wherein, the outer tube includes for the steel pipe:
and filling nickel-based brazing filler metal in the outer pipe.
3. The method for manufacturing an oil drill pipe according to claim 1 or 2, wherein the brazing filler metal is a sheet-like brazing filler metal, and the filling of the brazing filler metal into the outer pipe comprises:
and rolling the brazing filler metal into a cylinder shape, and placing the cylinder-shaped brazing filler metal in the outer tube, so that the outer wall of the brazing filler metal is attached to the inner wall of the outer tube.
4. The method of manufacturing an oil drill pipe according to claim 3, wherein installing the inner pipe within the outer pipe with the brazing filler metal therebetween, and forming a part to be welded includes:
and installing the inner tube in the cylinder of the brazing filler metal, and attaching the inner wall of the brazing filler metal and the outer wall of the inner tube.
5. The method for preparing an oil drill pipe according to claim 1, wherein the brazing the parts to be welded to form the oil drill pipe comprises:
placing the to-be-welded piece in a brazing furnace, vacuumizing and heating;
heating to a preset temperature at a preset heating speed, and then preserving heat according to heat preservation time;
cooling to 100 ℃ along with the furnace;
and taking out the petroleum drilling pipe to form a finished product.
6. The method of manufacturing an oil drill pipe according to claim 1, characterized in that a brazing filler metal is filled in the outward pipe; before the outer pipe is a steel pipe, the method comprises the following steps:
cleaning the outer tube and the inner tube;
and drying the outer pipe and the inner pipe.
7. The method of making an oil drill pipe according to claim 6, wherein said cleaning the outer pipe and the inner pipe comprises:
and placing the outer tube and the inner tube in an acetone solution for ultrasonic cleaning.
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