CN217632303U - Anti-fatigue drill rod structure - Google Patents
Anti-fatigue drill rod structure Download PDFInfo
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- CN217632303U CN217632303U CN202221589520.7U CN202221589520U CN217632303U CN 217632303 U CN217632303 U CN 217632303U CN 202221589520 U CN202221589520 U CN 202221589520U CN 217632303 U CN217632303 U CN 217632303U
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- release structure
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- pipe body
- drill
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- 230000002929 anti-fatigue Effects 0.000 title claims abstract description 22
- 230000008719 thickening Effects 0.000 claims abstract description 30
- 238000000034 method Methods 0.000 claims abstract description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
- 229910001069 Ti alloy Inorganic materials 0.000 claims description 3
- 238000005553 drilling Methods 0.000 abstract description 21
- 238000005452 bending Methods 0.000 abstract description 16
- 230000007704 transition Effects 0.000 abstract description 16
- 230000008034 disappearance Effects 0.000 abstract description 7
- 238000006073 displacement reaction Methods 0.000 abstract description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 238000010791 quenching Methods 0.000 description 4
- 230000000171 quenching effect Effects 0.000 description 4
- 238000005496 tempering Methods 0.000 description 4
- 239000003208 petroleum Substances 0.000 description 3
- 238000003672 processing method Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035772 mutation 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
- 238000007493 shaping process Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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Abstract
The utility model discloses an antifatigue drilling rod structure. The device 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. The utility model discloses an antifatigue drilling rod is when big displacement horizontal well, directional well, the rotatory drilling of short radius horizontal well, and the high bending stress in drilling rod thickening transition zone disappearance area can transmit to stress release structural, is showing the maximum bending stress that reduces on the drilling rod, improves drilling string life.
Description
Technical Field
The utility model relates to an oil drill rod that uses in the oil and gas exploration and development process especially relates to an antifatigue drill rod structure suitable for oil and gas exploitation such as large displacement horizontal well, directional well, short radius horizontal well.
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 many 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 of the drill rod, particularly, a plurality of puncture failure accidents near the disappearance positions of thickening transition zones of the drill rod frequently happen to the bent well sections of large-displacement horizontal wells, directional wells and short-radius horizontal wells, and the puncture failure accidents mainly occur because the thickening zones of the drill rod are structural mutation zones connected with a pipe body, the disappearance zones of the inner thickening transition zones are stress concentration zones, when the bent well sections are rotationally drilled, higher alternating bending stress is generated, fatigue cracks are generated by accumulating certain rotation times, and then the puncture leakage occurs under the action of high-pressure mud.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an antifatigue drilling rod structure mainly solves the defect that above-mentioned prior art exists, compares with current oil drill rod structure, increases stress relief structure between drill rod joint and drilling rod body thickening end, and when drilling in-process drilling string takes place crooked, the high bending stress in drilling rod thickening transition zone disappearance area can transmit to stress relief structure on, is showing the maximum bending stress that reduces on the drilling rod, improves drilling string life.
In order to achieve the above purpose, the technical scheme of the utility model is that:
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 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 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 ends of the first drill pipe body and the second drill pipe body, and the length L of the first stress release structure and the second stress release structure 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.
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.
Compared with the prior art, the utility model, have following outstanding advantage: (1) Compare with current oil drill rod structure, increase stress release structure between drill rod joint and drilling rod body thickening end, every drilling rod of prior art is when receiving bending stress, and only two thickening transition regions are as the bending deformation point, and the utility model discloses after increasing two stress release structures, the bending deformation point increases for four on every drilling rod, under same dog leg degree, the biggest bending deformation can all slow down with bending stress. 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 zone of the prior art relies on grinding apparatus high temperature extrusion, and the interior thickening quality control technique degree of difficulty is very big, and defects such as folding pit are many, the utility model discloses a stress release structure is machine tooling shaping, and surface quality is good, and as single drill rod stress release region, the security is higher than the thickening transition region.
Drawings
Fig. 1 is a schematic view of the structure of an anti-fatigue drill rod of the present invention.
Fig. 2 is a schematic view of the stress release structure of the present invention, which has a circular arc-shaped ring in the middle of the outer surface.
Fig. 3 is a schematic view of the stress releasing structure of the present invention with a conical ring in the middle of the outer surface.
In the figure, 1-a drill rod female joint, 21-a first stress release structure, 22-a second stress release structure, 3-a drill rod pipe body, 31-a first drill rod pipe body thickening end, 32-a second drill rod pipe body thickening end and 4-a drill rod male joint.
Detailed Description
Referring to fig. 1-3, the utility model discloses an anti-fatigue drill rod 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 thickened end 31 and a second drill pipe body thickened 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 utility model, the inner diameters of the first stress releasing structure 21 and the second stress releasing structure 22 are the same as the inner diameters of the first drill pipe body thickening end 31 and the second drill pipe body thickening end 32, and the length L of the first stress releasing structure 21 and the second stress releasing 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.
The utility model discloses in, antifatigue drilling rod material is steel, titanium alloy or aluminum alloy, antifatigue drilling rod specification includes 60.325 ~ 215.900mm.
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 9.19mm;
the inner diameter of the stress release structure is the same as the inner diameter 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 400mm.
The drill rod female joint 1 or the drill rod male joint 4 and the stress release structure are integrally processed and manufactured, and can be directly processed on a machine tool by adopting a thick-walled pipe subjected to quenching and tempering heat treatment.
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. And the utility model discloses the regional maximum stress of antifatigue drilling rod stress release structure is close rather than the regional maximum stress that disappears of drilling rod thickening transition zone, increases behind the stress release structure, and drilling rod thickening transition zone disappears regional maximum stress and reduces 41% than 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. All equivalent changes and modifications made according to the content of the claims of the present invention shall fall within the technical scope of the present invention.
Claims (3)
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 a thickened end (31) and a thickened end (32) of the first drill pipe body, and the length L of the first stress release structure (21) and the length L of the second stress release structure (22) 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.
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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221589520.7U CN217632303U (en) | 2022-06-24 | 2022-06-24 | Anti-fatigue drill rod structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221589520.7U CN217632303U (en) | 2022-06-24 | 2022-06-24 | Anti-fatigue drill rod structure |
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| Publication Number | Publication Date |
|---|---|
| CN217632303U true CN217632303U (en) | 2022-10-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202221589520.7U Active CN217632303U (en) | 2022-06-24 | 2022-06-24 | Anti-fatigue drill rod structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114934752A (en) * | 2022-06-24 | 2022-08-23 | 上海海隆石油管材研究所 | A kind of anti-fatigue drill pipe structure and its processing method |
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2022
- 2022-06-24 CN CN202221589520.7U patent/CN217632303U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114934752A (en) * | 2022-06-24 | 2022-08-23 | 上海海隆石油管材研究所 | A kind of anti-fatigue drill pipe structure and its processing method |
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