CN117506331A - Integral metallurgical composite bimetal oil pipe and preparation process thereof - Google Patents
Integral metallurgical composite bimetal oil pipe and preparation process thereof Download PDFInfo
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- CN117506331A CN117506331A CN202311401430.XA CN202311401430A CN117506331A CN 117506331 A CN117506331 A CN 117506331A CN 202311401430 A CN202311401430 A CN 202311401430A CN 117506331 A CN117506331 A CN 117506331A
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- 239000002131 composite material Substances 0.000 title claims abstract description 40
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 238000005260 corrosion Methods 0.000 claims abstract description 55
- 230000007797 corrosion Effects 0.000 claims abstract description 52
- 239000000956 alloy Substances 0.000 claims abstract description 48
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 47
- 239000010410 layer Substances 0.000 claims abstract description 31
- 238000004519 manufacturing process Methods 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 11
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 239000002344 surface layer Substances 0.000 claims abstract description 5
- 238000003754 machining Methods 0.000 claims abstract description 4
- 230000008719 thickening Effects 0.000 claims abstract description 4
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 6
- 239000010962 carbon steel Substances 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 238000007670 refining Methods 0.000 claims description 4
- 238000003466 welding Methods 0.000 abstract description 7
- 241000692569 Stylephorus chordatus Species 0.000 abstract 1
- 230000008878 coupling Effects 0.000 description 7
- 238000010168 coupling process Methods 0.000 description 7
- 238000005859 coupling reaction Methods 0.000 description 7
- 238000005496 tempering Methods 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 238000010791 quenching Methods 0.000 description 4
- 230000000171 quenching effect Effects 0.000 description 4
- 238000001816 cooling Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000005242 forging Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003208 petroleum Substances 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
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
- B21J5/08—Upsetting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
- C21D9/085—Cooling or quenching
-
- 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
- E21B17/08—Casing joints
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Fluid Mechanics (AREA)
- Geochemistry & Mineralogy (AREA)
- Thermal Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Forging (AREA)
Abstract
The invention relates to the field of oil casings for energy exploration and development, and provides an integral metallurgical composite bimetallic oil pipe and a preparation process thereof, wherein the process comprises the following steps: s1: carrying out primary external thickening upsetting on the first end of the pipe body, wherein the outer surface size of the pipe end after upsetting meets the outer diameter requirement of an internal threaded joint, and the inner surface of the pipe end is conical; s2, performing secondary upsetting on the internal thread joint section of the first end, wherein the size of the outer surface of the first end of the pipe body is unchanged after upsetting, the inner surface is a conical surface, and the thickness of the corrosion-resistant alloy of the inner surface layer is linearly increased from the end face to the inside along the axial direction; s3, carrying out overall heat treatment; s4, processing internal threads on the first end of the pipe body; s5, external thread machining is conducted on the second end of the pipe body. The corrosion-resistant alloy torque shoulder is formed at the thread tail end of the internal thread joint, so that the problem of corrosion-resistant treatment of the internal thread end of the corrosion-resistant alloy oil pipe thread is solved; the corrosion-resistant alloy layer is not required to be formed at the inner thread end by adopting corrosion-resistant alloy welding, so that the production cost of the oil pipe is effectively reduced, and the production efficiency is improved.
Description
Technical Field
The invention relates to the field of oil casings for energy exploration and development, in particular to an integral metallurgical composite bimetallic oil pipe and a preparation process thereof.
Background
The bimetal composite pipe has good corrosion resistance in the inner layer, so that the bimetal composite pipe is increasingly applied to the energy exploration and development processes of petroleum, natural gas, coal bed gas and the like, for example, the bimetal composite pipe is used for processing and manufacturing an oil sleeve so as to stabilize a well wall and form an oil-gas channel. However, the corrosion resistance between the pipe body and the coupling at the threaded connection part of the bimetallic oil pipe is an important reason for restricting the application of the bimetallic oil pipe, namely, the potential difference corrosion between the surface layer matrix and the inner corrosion-resistant alloy layer of the bimetallic oil pipe, and the potential difference corrosion between the bimetallic oil pipe body and the coupling material. At present, the common method for the threaded connection part of the bimetal composite pipe is to build up welding of the same corrosion resistant alloy material on the end part of the pipe body and the surface of the coupling, so that the corrosion resistant alloy of the same material is used for the connection part of the pipe body and the coupling, the cost of the threaded connection of the bimetal composite pipe is increased, the manufacturing process of the threaded connection is increased, and the production efficiency is reduced.
Accordingly, there is a need to develop a monolithic metallurgical composite bimetallic oil tube manufacturing process that addresses the deficiencies of the prior art to solve or mitigate one or more of the problems described above.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides an integral metallurgical composite bimetal oil pipe and a preparation process, and solves the problems of high cost and low production efficiency of welding corrosion-resistant alloy inside a bimetal composite threaded connection coupling in the prior art.
The invention adopts the following technical scheme:
in one aspect, the invention provides a process for preparing an integral metallurgical composite bimetallic oil pipe, wherein the outer layer of the bimetallic oil pipe is metal, the inner layer of the bimetallic oil pipe is corrosion-resistant alloy, and the process comprises the following steps:
s1, carrying out primary external thickening upsetting on a first end of a pipe body of an initial double-layer metal pipe, wherein the outer surface size of the pipe end after upsetting meets the outer diameter requirement of an internal thread joint, and the inner surface of the pipe end is conical;
s2, performing secondary upsetting on the internal thread joint section of the first end, wherein the size of the outer surface of the first end of the pipe body is unchanged after upsetting, the inner surface is a conical surface, and the thickness of the corrosion-resistant alloy of the inner surface layer is linearly increased from the end face to the inside along the axial direction;
s3, carrying out overall heat treatment on the pipe body subjected to the treatment of S1 and S2;
s4, internal thread processing is carried out on the first end of the pipe body, and an anti-corrosion alloy internal thread torque shoulder is formed at the innermost side of the internal thread joint section;
s5, machining external threads on the second end of the pipe body, wherein the external threads are matched with the internal threads formed in the step S4.
In any one of the possible implementation manners described above, there is further provided an implementation manner, wherein the outer layer of the bimetallic oil pipe is carbon steel, and the corrosion-resistant alloy thickness of the inner layer is greater than or equal to 1.5mm. Experiments have shown that if the corrosion resistant alloy is less than 1.5mm thick, there is a potential for poor protection where thickness limitations may better achieve the integrity of the corrosion resistant alloy at the threaded connection.
In any one of the possible implementation manners described above, there is further provided an implementation manner, wherein after the step S1 of upsetting, the outer surface of the upsetting section of the first end of the pipe body is composed of a first conical surface section and a cylindrical section, and the outer diameter of the cylindrical section is not less than 1.1 times the outer diameter of the pipe body.
In any of the possible implementations described above, there is further provided an implementation in which the cylindrical section has an outer diameter that is 1.2 times the outer diameter of the tube body.
In any of the foregoing possible implementations, there is further provided an implementation in which after the step S1 primary upsetting, the inner surface of the upsetting section of the first end of the pipe body forms a second conical section with a taper of less than 1:16.
In any of the possible implementations described above, there is further provided an implementation in which the taper of the second conical surface section is 1:20.
In any of the possible implementations described above, there is further provided an implementation in which the secondary upsetting is upsetting by die forging, and the corrosion resistant alloy layer flows and is deposited from the end portion to the inside.
In any of the possible implementations described above, there is further provided an implementation manner, wherein after the second upsetting treatment in step S2, the inner surface of the upsetting section of the first end of the pipe body forms a third conical section, and the thickness of the corrosion-resistant alloy layer at the small end of the inner diameter of the third conical section is not less than 3mm.
In any one of the possible implementation manners described above, there is further provided an implementation manner, in step S4, after the first end of the pipe body is threaded, a torque shoulder surface of the end of the internal thread is made of corrosion-resistant alloy, and the torque shoulder surface is thicker than 2mm. Experiments show that when the torque shoulder is smaller than 2mm, the torque shoulder is easy to deform when being extruded, so that the torque shoulder is damaged.
In any one of the possible implementations described above, there is further provided an implementation, in step S3, the overall heat treatment is thermal refining.
In any one of the possible implementation manners described above, there is further provided an implementation manner, for a composite pipe with an outer layer of carbon steel and an inner layer of corrosion resistant alloy, the thermal refining specifically includes: quenching and tempering, wherein the temperature is 970 ℃, preserving heat for 30min, quenching, tempering at 600 ℃, preserving heat for 120min, and then air cooling.
On the other hand, the invention also provides the integral metallurgical composite bimetallic oil pipe, which is obtained by the preparation process of the integral metallurgical composite bimetallic oil pipe.
When the two integral metallurgical composite bimetallic oil pipes are connected, the torque shoulder is made of corrosion-resistant alloy, the inner end face of the external thread at the other end is made of corrosion-resistant alloy, and the inner surface of the whole connected pipe is made of corrosion-resistant alloy and cannot be corroded.
The beneficial effects of the invention are as follows: the invention provides a manufacturing process of an integral metallurgical composite bimetallic oil pipe, which is characterized in that the integral upsetting molding is carried out on the internal thread end of the composite oil pipe through a special secondary upsetting process, so that corrosion-resistant alloy of the inner layer of the composite pipe flows from the end part to the inside in a stacking way, and a corrosion-resistant alloy torque shoulder is formed at the thread end after the internal thread is subjected to upsetting, thereby solving the corrosion-resistant treatment problem of the internal thread end of the corrosion-resistant alloy oil pipe. Compared with the conventional treatment mode that the corrosion-resistant alloy coating welding is needed to be carried out on the inner surface of the coupling when the conventional bimetal composite oil pipe is in threaded connection, the corrosion-resistant alloy coating welding mode is not needed to be adopted to form the corrosion-resistant alloy layer at the inner thread end, so that the production cost of the oil pipe is effectively reduced, and the production efficiency is improved.
Drawings
FIG. 1 is a schematic diagram of a process for manufacturing an integral metallurgical composite bimetallic oil pipe in accordance with an embodiment of the present invention.
Wherein: 1. a double-layer metal pipe body; 1-1, outer carbon steel; 1-2, inner layer corrosion resistant alloy; 1-3, an internal thread joint cylindrical section; 1-4, an external conical section (a first conical section) of the internal thread joint; 1-5, a second conical section in the internal threaded joint after one-time upsetting; 1-6, a third conical section in the internal threaded joint after secondary upsetting; 1-7, internal threads; 1-8, internal thread torque shoulder; 1-9, external threads.
Detailed Description
Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the technical features or combinations of technical features described in the following embodiments should not be regarded as being isolated, and they may be combined with each other to achieve a better technical effect.
As shown in fig. 1, in the preparation process of the integral metallurgical composite bimetallic oil pipe, an outer layer of the bimetallic oil pipe is metal, an inner layer of the bimetallic oil pipe is corrosion resistant alloy, and the process comprises the following steps:
s1, carrying out primary external thickening and upsetting on a first end of an initial double-layer metal pipe body 1, wherein the outer surface size of the pipe end after upsetting meets the outer diameter requirement of an internal threaded joint, and the inner surface of the pipe end is conical;
s2, performing secondary upsetting on the internal thread joint section of the first end, wherein the size of the outer surface of the first end of the pipe body is unchanged after upsetting, the inner surface is a conical surface, and the thickness of the corrosion-resistant alloy of the inner surface layer is linearly increased from the end face to the inside along the axial direction;
s3, carrying out overall heat treatment on the pipe body subjected to the treatment of S1 and S2;
s4, performing internal thread processing on the first end of the pipe body, and forming an anti-corrosion alloy internal thread torque shoulder 1-8 at the innermost side of the internal thread joint section;
s5, machining external threads 1-9 on the second end of the pipe body, wherein the external threads 1-9 are matched with the internal threads 1-7 formed in the step S4.
In a specific embodiment, the outer layer of the bimetallic oil pipe is carbon steel 1-2, and the thickness of the corrosion resistant alloy 1-3 of the inner layer is more than or equal to 1.5mm.
In a specific embodiment, after the primary upsetting treatment in the step S1, the outer surface of the upsetting section of the first end of the pipe body consists of a first conical surface section 1-4 and a cylindrical section 1-3, and the outer diameter of the cylindrical section 1-3 is not smaller than 1.1 times of the outer diameter of the pipe body.
In a preferred embodiment, the cylindrical sections 1-3 have an outer diameter 1.2 times the outer diameter of the tubular body
In one embodiment, after one upsetting operation in step S1, the inner surface of the upset section of the first end of the tubular body forms a second conical section 1-5 with a taper of less than 1:16.
In a preferred embodiment, the taper of the second conical sections 1-5 is 1:20.
In one embodiment, the secondary upsetting is die forging upsetting, and the corrosion resistant alloy layer flows and is piled up from the end to the inside.
In a specific embodiment, after the secondary upsetting treatment in the step S2, the inner surface of the upsetting section of the first end of the pipe body forms a third conical section 1-6, and the thickness of the corrosion-resistant alloy layer at the small end of the inner diameter of the third conical section 1-6 is not less than 3mm.
In a specific embodiment, in step S4, after the first end of the pipe body is threaded, the surfaces 1-8 of the torque shoulders 1-7 of the end of the internal thread are made of corrosion-resistant alloy, and the thickness of the surfaces 1-8 of the torque shoulders is greater than 2mm.
In a specific embodiment, in step S3, the bulk heat treatment is thermal refining.
In one specific embodiment, for a composite pipe with carbon steel as the outer layer and corrosion resistant alloy as the inner layer, the tempering is specifically: quenching and tempering, wherein the temperature is 970 ℃, preserving heat for 30min, quenching, tempering at 600 ℃, preserving heat for 120min, and then air cooling.
On the other hand, the invention also provides the integral metallurgical composite bimetallic oil pipe, which is obtained by the preparation process of the integral metallurgical composite bimetallic oil pipe.
The process of the invention performs integral upsetting forming on the internal thread end of the composite oil pipe through a special secondary upsetting process, so that the corrosion-resistant alloy of the inner layer of the composite pipe flows from the end part to the inside in a stacking way, thereby forming a corrosion-resistant alloy torque shoulder at the thread end after the internal thread of the upsetting section is processed, and solving the corrosion-resistant treatment problem of the internal thread end of the corrosion-resistant alloy oil pipe. Compared with the conventional treatment mode that the corrosion-resistant alloy coating welding is needed to be carried out on the inner surface of the coupling when the conventional bimetal composite oil pipe is in threaded connection, the corrosion-resistant alloy coating welding mode is not needed to be adopted to form the corrosion-resistant alloy layer at the inner thread end, so that the production cost of the oil pipe is effectively reduced, and the production efficiency is improved.
Although embodiments of the present invention have been described herein, it will be appreciated by those of ordinary skill in the art that changes can be made to the embodiments herein without departing from the spirit of the invention. The above-described embodiments are exemplary only, and should not be taken as limiting the scope of the claims herein.
Claims (10)
1. The preparation process of the integral metallurgical composite bimetallic oil pipe is characterized by comprising the following steps of:
s1, carrying out primary external thickening upsetting on a first end of a pipe body of an initial double-layer metal pipe, wherein the outer surface size of the pipe end after upsetting meets the outer diameter requirement of an internal thread joint, and the inner surface of the pipe end is conical;
s2, performing secondary upsetting on the internal thread joint section of the first end, wherein the size of the outer surface of the first end of the pipe body is unchanged after upsetting, the inner surface is a conical surface, and the thickness of the corrosion-resistant alloy of the inner surface layer is linearly increased from the end face to the inside along the axial direction;
s3, carrying out overall heat treatment on the pipe body subjected to the treatment of S1 and S2;
s4, internal thread processing is carried out on the first end of the pipe body, and an anti-corrosion alloy internal thread torque shoulder is formed at the innermost side of the internal thread joint section;
s5, machining external threads on the second end of the pipe body, wherein the external threads are matched with the internal threads formed in the step S4.
2. The process for preparing the integral metallurgical composite bimetallic oil pipe as claimed in claim 1, wherein the outer layer of the bimetallic oil pipe is carbon steel, and the thickness of the corrosion resistant alloy of the inner layer is more than or equal to 1.5mm.
3. The process for preparing the integral metallurgical composite bimetallic oil pipe as claimed in claim 1, wherein after the primary upsetting treatment in the step S1, the outer surface of the upsetting section of the first end of the pipe body is composed of a first conical surface section and a cylindrical section, and the outer diameter of the cylindrical section is not less than 1.1 times of the outer diameter of the pipe body.
4. A process for the preparation of an integral metallurgical composite bimetallic oil pipe as claimed in claim 3, wherein the outer diameter of the cylindrical section is 1.2 times the outer diameter of the pipe body.
5. The process for preparing an integral metallurgical composite bimetallic oil pipe as claimed in claim 3, wherein after one upsetting treatment in step S1, the inner surface of the upsetting section of the first end of the pipe body forms a second conical section with a taper of less than 1:16.
6. The process for preparing an integral metallurgical composite bimetallic oil tube of claim 5, wherein the second conical section has a taper of 1:20.
7. The process for preparing the integral metallurgical composite bimetallic oil pipe as claimed in claim 1, wherein after the secondary upsetting treatment in the step S2, a third conical section is formed on the inner surface of the upsetting section of the first end of the pipe body, and the thickness of the corrosion-resistant alloy layer at the small end of the inner diameter of the third conical section is not less than 3mm.
8. The process for preparing an integral metallurgical composite bimetallic oil pipe as claimed in claim 1, wherein in step S4, after the first end of the pipe body is provided with the internal thread, the torque shoulder surface of the end of the internal thread is made of corrosion-resistant alloy, and the thickness of the torque shoulder surface is greater than 2mm.
9. The process for preparing an integral metallurgical composite bimetallic oil pipe of claim 1, wherein in step S3, the bulk heat treatment is a thermal refining.
10. A monolithic metallurgically composite bimetallic oil pipe, characterized in that it is obtained by the process for the preparation of a monolithic metallurgically composite bimetallic oil pipe according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311401430.XA CN117506331A (en) | 2023-10-26 | 2023-10-26 | Integral metallurgical composite bimetal oil pipe and preparation process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311401430.XA CN117506331A (en) | 2023-10-26 | 2023-10-26 | Integral metallurgical composite bimetal oil pipe and preparation process thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117506331A true CN117506331A (en) | 2024-02-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311401430.XA Pending CN117506331A (en) | 2023-10-26 | 2023-10-26 | Integral metallurgical composite bimetal oil pipe and preparation process thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117506331A (en) |
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2023
- 2023-10-26 CN CN202311401430.XA patent/CN117506331A/en active Pending
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