CN114934752A - Anti-fatigue drill rod structure and machining method thereof - Google Patents
Anti-fatigue drill rod structure and machining method thereof Download PDFInfo
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- CN114934752A CN114934752A CN202210721098.4A CN202210721098A CN114934752A CN 114934752 A CN114934752 A CN 114934752A CN 202210721098 A CN202210721098 A CN 202210721098A CN 114934752 A CN114934752 A CN 114934752A
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- drill rod
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- 230000002929 anti-fatigue Effects 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 8
- 238000003754 machining Methods 0.000 title description 2
- 230000008719 thickening Effects 0.000 claims abstract description 23
- 238000010438 heat treatment Methods 0.000 claims description 10
- 238000010791 quenching Methods 0.000 claims description 10
- 230000000171 quenching effect Effects 0.000 claims description 10
- 238000005496 tempering Methods 0.000 claims description 10
- 238000003466 welding Methods 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
- 229910001069 Ti alloy Inorganic materials 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 238000005452 bending Methods 0.000 abstract description 13
- 230000007704 transition Effects 0.000 abstract description 13
- 238000003672 processing method Methods 0.000 abstract description 9
- 230000008034 disappearance Effects 0.000 abstract description 5
- 238000006073 displacement reaction Methods 0.000 abstract description 4
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 238000005553 drilling Methods 0.000 abstract 1
- 239000003208 petroleum Substances 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005242 forging Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
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Classifications
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- 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
- 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
-
- 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
- B23P15/28—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass cutting tools
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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)
Abstract
The invention discloses an anti-fatigue drill rod structure and a processing method thereof. The anti-fatigue drill rod structure sequentially comprises a drill rod female joint, a first stress release structure, a drill rod pipe body, a second stress release structure and a drill rod male joint which are adjacently connected; a first drill pipe body thickening end and a second drill pipe body thickening end are arranged at two ends of the drill pipe body; the method is characterized in that: the inner surfaces of the first stress release structure and the second stress release structure are cylindrical, the two ends of the outer surface are cylindrical, the middle of the outer surface is an inwards concave circular arc ring or conical ring, and the minimum wall thickness dx of the first stress release structure and the second stress release structure is greater than or equal to 80% of the nominal wall thickness of the drill pipe body. When the anti-fatigue drill rod is used for rotary drilling of a large-displacement horizontal well, a directional well and a short-radius horizontal well, high bending stress of a thickening transition zone disappearance area of the drill rod can be transmitted to the stress release structure, so that the maximum bending stress on the drill rod is remarkably reduced, and the service life of a drill column is prolonged.
Description
Technical Field
The invention relates to an oil drill rod used in the process of oil and gas exploration and development, in particular to an anti-fatigue drill rod structure suitable for oil and gas exploitation of a large-displacement horizontal well, a directional well, a short-radius horizontal well and the like and a processing method thereof.
Background
The drill rod is a pipe with large consumption and high quality requirement in petroleum pipes, and economic loss caused by failure accidents of the drill rod in various oil fields at home and abroad every year is huge. With the development of petroleum equipment, the production quality of petroleum drill rods has reached a higher level through the improvement of drill rod thickening structures, thread structures, inner coatings and the like. For the reason of failure of the drill rod, a large number of experimental analyses and researches are carried out by a plurality of scholars, wherein fatigue still is the main failure mode of the failure of the drill rod, and accounts for about 80% of the total failure rate of the drill rod, and particularly, a plurality of puncture failure accidents near the disappearance positions of the thickening transition zones of the drill rod frequently happen to the bent well sections of a large-displacement horizontal well, a directional well and a short-radius horizontal well.
Disclosure of Invention
The invention aims to provide an anti-fatigue drill rod structure and a processing method thereof, which mainly solve the defects in the prior art.
In order to achieve the purpose, the technical scheme of the invention is as follows:
an anti-fatigue drill rod structure sequentially comprises a drill rod female joint, a first stress release structure, a drill rod pipe body, a second stress release structure and a drill rod male joint which are adjacently connected; a first drill rod pipe body thickening end and a second drill rod pipe body thickening end are arranged at two ends of the drill rod pipe body; the method is characterized in that: the inner surfaces of the first stress release structure and the second stress release structure are cylindrical, the two ends of the outer surfaces of the first stress release structure and the second stress release structure are cylindrical, the middle of the outer surfaces of the first stress release structure and the second stress release structure is an inwards concave arc-shaped ring or a conical ring, and the minimum wall thickness dx of the first stress release structure and the second stress release structure is greater than or equal to 80% of the nominal wall thickness of the drill pipe body;
the anti-fatigue drill rod structure is characterized in that: the inner diameters of the first stress release structure and the second stress release structure are the same as the inner diameters of the thickened end of the first drill pipe body and the thickened end of the second drill pipe body, and the length L of the first stress release structure and the length L of the second stress release structure are 50-300 mm; the minimum radius R of the circular arc ring in the middle of the outer surface is 80-600 mm, or the included angle alpha of the conical surface of the conical ring in the middle of the outer surface is 90-175 degrees.
The anti-fatigue drill rod structure is characterized in that: the anti-fatigue drill rod is made of steel, titanium alloy or aluminum alloy, and the specification of the anti-fatigue drill rod comprises 60.325-215.900 mm.
The processing method of the anti-fatigue drill rod structure is characterized by comprising the following steps: the drill rod female joint and the first stress release structure as well as the drill rod male joint and the second stress release structure are integrally processed and manufactured, a thick-wall pipe subjected to quenching and tempering heat treatment is directly processed on a machine tool, or a solid bar stock is manufactured into a blank in a mode of forging and forming by a die, then the quenching and tempering heat treatment is carried out, and finally the blank is processed on the machine tool.
The processing method of the anti-fatigue drill rod structure is characterized by comprising the following steps: the first stress release structure and the second stress release structure are independently processed by adopting a thick-wall pipe subjected to quenching and tempering heat treatment, and then the drill rod female joint and the drill rod male joint are welded together through friction.
The processing method of the anti-fatigue drill rod structure is characterized by comprising the following steps of: and friction welding the female joint of the drill rod with the first stress release structure with the thickened end of the first drill rod pipe body, and friction welding the male joint of the drill rod with the second stress release structure with the thickened end of the second drill rod pipe body.
Compared with the prior art, the invention has the following outstanding advantages: (1) compared with the existing petroleum drill rod structure, the stress release structure is added between the drill rod joint and the thickened end of the drill rod pipe body, only two thickened transition areas are used as bending deformation points when each drill rod is subjected to bending stress in the prior art, after the two stress release structures are added, the number of the bending deformation points on each drill rod is increased to four, and the maximum bending deformation and the bending stress can be relieved under the same dog-leg degree. Therefore, when a large-displacement horizontal well, a directional well and a short-radius horizontal well are drilled in a rotating mode, high bending stress of the vanishing section of the thickening transition zone of the drill rod can be transmitted to the stress release structure, the maximum bending stress on the drill rod is remarkably reduced, stress concentration of the vanishing section of the thickening transition zone of the drill rod is relieved, and the service life of a drill column is prolonged. (2) The drill rod thickening transition belt in the prior art is formed by means of high-temperature extrusion of a grinding tool, the internal thickening quality control technology is very difficult, and defects such as folding pits are more.
Drawings
Fig. 1 is a schematic structural view of an anti-fatigue drill rod according to the present invention.
Fig. 2 is a schematic view of the stress release structure of the present invention with a circular arc ring in the middle of the outer surface.
FIG. 3 is a schematic view of the stress relieving structure of the present invention with a tapered ring in the middle of the outer surface.
In the figure, the drill rod female joint, the first stress release structure, the second stress release structure, the drill rod pipe body, the first drill rod pipe body thickening end, the second drill rod pipe body thickening end and the 4 drill rod male joint are 1-21-22-3-31-32-4-respectively.
Detailed Description
Referring to fig. 1-3, the invention discloses an anti-fatigue drill pipe structure. As shown in the figure: the drill pipe comprises a drill pipe female joint 1, a first stress release structure 21, a drill pipe body 3, a second stress release structure 22 and a drill pipe male joint 4 which are connected adjacently in sequence; a first drill pipe body thickening end 31 and a second drill pipe body thickening end 32 are arranged at two ends of the drill pipe body 3; the inner surfaces of the first stress releasing structure 21 and the second stress releasing structure 22 are cylindrical, the two ends of the outer surfaces are cylindrical, the middle of the outer surfaces are concave arc-shaped rings or conical rings, and the minimum wall thickness dx of the first stress releasing structure 21 and the second stress releasing structure 22 is greater than or equal to 80% of the nominal wall thickness of the drill pipe body 3;
in the invention, the inner diameters of the first stress release structure 21 and the second stress release structure 22 are the same as the inner diameters of the first drill pipe body thickened end 31 and the second drill pipe body thickened end 32, and the length L of the first stress release structure 21 and the second stress release structure 22 is 50-300 mm; the minimum radius R of the circular arc ring in the middle of the outer surface is 80-600 mm, or the included angle alpha of the conical surface of the conical ring in the middle of the outer surface is 90-175 degrees.
In the invention, the anti-fatigue drill rod is made of steel, titanium alloy or aluminum alloy, and the specification of the anti-fatigue drill rod comprises 60.325-215.900 mm.
According to the processing method of the anti-fatigue drill rod structure, the drill rod female joint 1 and the first stress release structure 21 as well as the drill rod male joint 4 and the second stress release structure 22 are integrally processed and manufactured, a thick-wall pipe subjected to quenching and tempering heat treatment is directly processed on a machine tool, or a solid bar is firstly manufactured into a blank by utilizing a die forging forming mode, then the quenching and tempering heat treatment is carried out, and finally the blank is processed on the machine tool.
The drill pipe box 1 with the first stress relief structure 21 is friction welded to the first drill pipe body upset 31 and the drill pipe pin 4 with the second stress relief structure 22 is friction welded to the second drill pipe body upset 32.
The other processing method of the anti-fatigue drill rod structure is characterized in that: the first stress release structure 21 and the second stress release structure 22 are separately processed by adopting thick-wall pipes subjected to quenching and tempering heat treatment, and then the drill rod female joint 1 and the drill rod male joint 4 are welded together through friction.
The drill pipe box 1 with the first stress relief structure 21 is friction welded to the first drill pipe body upset 31 and the drill pipe pin 4 with the second stress relief structure 22 is friction welded to the second drill pipe body upset 32.
Examples
Selecting a 139.7 multiplied by 9.19mm specification steel drill rod with steel grade S135, and referring to fig. 1 and fig. 2, the fatigue-resistant drill rod structure and the processing and manufacturing method thereof are disclosed, wherein the fatigue-resistant drill rod sequentially comprises a drill rod female joint 1, a first stress release structure 21, a drill rod pipe body 3, a second stress release structure 22 and a drill rod male joint 4, and a first drill rod pipe body thickened end 31 and a second drill rod pipe body thickened end 32 are arranged at two ends of the drill rod pipe body 3.
The inner surfaces of the first stress releasing structure 21 and the second stress releasing structure 22 are cylindrical, two ends of the outer surface are cylindrical, and the middle of the outer surface is a circular arc-shaped ring.
The minimum wall thickness dx of the stress release structure is 9.19 mm;
the inner diameter of the stress release structure is the same as that of the thickened end of the adjacent drill pipe body, the length L is 200mm, and the radius R of the arc-shaped ring in the middle of the outer surface is 400 mm.
The drill rod female joint 1 or the drill rod male joint 4 and the stress release structure are integrally processed and manufactured, and thick-walled pipes subjected to quenching and tempering heat treatment can be directly processed on a machine tool.
And (3) friction welding the drill rod female joint 1 with the stress release structure with the thickened end of the adjacent drill rod pipe body, and friction welding the drill rod male joint 4 with the stress release structure with the thickened end of the adjacent drill rod pipe body.
Aiming at the anti-fatigue drill rod, when a drill string with the length of 50m and consisting of 5 drill rods is in a bending well section with the dog-leg degree of 10 degrees/30 m, the stress on the third drill rod is the largest, the maximum stress in a stress release structure area is 287MPa, the maximum stress in a drill rod thickening transition zone disappearance area is 263MPa, and the stress on a drill rod pipe body is 35 MPa-68 MPa.
Comparative example
A steel drill rod with the specification of 139.7 multiplied by 9.19mm and the steel grade S135 is selected, and a stress release structure is avoided.
Aiming at the drill rods in the prior art, when a drill string with the length of 50m and consisting of 5 drill rods is in a bending well section with the dog-leg degree of 10 degrees/30 m, the stress on the third drill rod is the largest, the maximum stress of a transition zone disappearing area of the thickened drill rod is 447MPa, and the stress on a drill rod pipe body is 35 MPa-75 MPa.
Compared with the simulation calculation analysis result of the drill rod in the prior art in the embodiment, the fatigue-resistant drill rod has the potential safety hazard because the maximum stress of the existing drill rod thickening transition zone disappearing area is 447 MPa. The maximum stress of the stress release structure area of the anti-fatigue drill rod is close to the maximum stress of the vanishing area of the thickening transition zone of the drill rod, and after the stress release structure is added, the maximum stress of the vanishing area of the thickening transition zone of the drill rod is reduced by 41 percent compared with the prior art. The high bending stress in the drill rod thickening transition zone disappearance area is transmitted to the stress release structure, and the maximum bending stress on the drill rod is obviously reduced, so that the stress concentration of the drill rod thickening transition zone disappearance area is slowed down, and the service life of the drill column is prolonged.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. That is, all equivalent changes and modifications made according to the content of the claims of the present invention should be within the technical scope of the present invention.
Claims (7)
1. An anti-fatigue drill rod structure sequentially comprises a drill rod female joint (1), a first stress release structure (21), a drill rod pipe body (3), a second stress release structure (22) and a drill rod male joint (4) which are adjacently connected; a first drill pipe body thickening end (31) and a second drill pipe body thickening end (32) are arranged at two ends of the drill pipe body (3); the method is characterized in that: the inner surfaces of the first stress release structure (21) and the second stress release structure (22) are cylindrical, the two ends of the outer surfaces of the first stress release structure and the second stress release structure are cylindrical, the middle of the outer surfaces of the first stress release structure and the second stress release structure is an inwards concave arc-shaped ring or a conical ring, and the minimum wall thickness dx of the first stress release structure (21) and the second stress release structure (22) is greater than or equal to 80% of the nominal wall thickness of the drill pipe body (3).
2. A fatigue-resistant drill rod structure as in claim 1, wherein: the inner diameters of the first stress release structure (21) and the second stress release structure (22) are the same as the inner diameters of the thickened end (31) and the thickened end (32) of the first drill pipe body, and the length L of the first stress release structure (21) and the second stress release structure (22) is 50-300 mm; the minimum radius R of the circular arc ring in the middle of the outer surface is 80-600 mm, or the included angle alpha of the conical surface of the conical ring in the middle of the outer surface is 90-175 degrees.
3. A fatigue-resistant drill rod structure as in claim 1, wherein: the anti-fatigue drill rod is made of steel, titanium alloy or aluminum alloy, and the specification of the anti-fatigue drill rod comprises 60.325-215.900 mm.
4. A method of manufacturing a fatigue-resistant drill pipe structure as claimed in claim 1, 2 or 3, wherein: the drill rod female joint (1) and the first stress release structure (21) as well as the drill rod male joint (4) and the second stress release structure (22) are integrally processed and manufactured, a thick-walled pipe subjected to quenching and tempering heat treatment is adopted and directly processed on a machine tool, or a solid bar can be adopted and forged and formed by a die to firstly manufacture a blank, then the quenching and tempering heat treatment is carried out, and finally the blank is processed on the machine tool.
5. The method for processing the fatigue-resistant drill rod structure according to claim 4, wherein: and (3) friction welding the drill rod female joint (1) with the first stress release structure (21) and the first drill rod pipe body thickened end (31), and friction welding the drill rod male joint (4) with the second stress release structure (22) and the second drill rod pipe body thickened end (32).
6. A method of manufacturing a fatigue-resistant drill pipe structure as claimed in claim 1, 2 or 3, wherein: the first stress release structure (21) and the second stress release structure (22) are processed by a thick-wall pipe subjected to quenching and tempering heat treatment separately, and then the drill rod female joint (1) and the drill rod male joint (4) are welded together through friction.
7. The method for processing the fatigue-resistant drill rod structure as recited in claim 6, wherein: and (3) friction welding the drill pipe female joint (1) with the first stress release structure (21) and the first drill pipe body thickened end (31), and friction welding the drill pipe male joint (4) with the second stress release structure (22) and the second drill pipe body thickened end (32).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210721098.4A CN114934752A (en) | 2022-06-24 | 2022-06-24 | Anti-fatigue drill rod structure and machining method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210721098.4A CN114934752A (en) | 2022-06-24 | 2022-06-24 | Anti-fatigue drill rod structure and machining method thereof |
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| Publication Number | Publication Date |
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| CN114934752A true CN114934752A (en) | 2022-08-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210721098.4A Pending CN114934752A (en) | 2022-06-24 | 2022-06-24 | Anti-fatigue drill rod structure and machining method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117127922A (en) * | 2023-10-13 | 2023-11-28 | 澳普洛钻探工具(无锡)有限公司 | V-WALL material drilling rod |
-
2022
- 2022-06-24 CN CN202210721098.4A patent/CN114934752A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117127922A (en) * | 2023-10-13 | 2023-11-28 | 澳普洛钻探工具(无锡)有限公司 | V-WALL material drilling rod |
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