CN208763603U - A kind of new drilling tool internal screw thread stress dispersion slot structure - Google Patents
A kind of new drilling tool internal screw thread stress dispersion slot structure Download PDFInfo
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- CN208763603U CN208763603U CN201820587065.4U CN201820587065U CN208763603U CN 208763603 U CN208763603 U CN 208763603U CN 201820587065 U CN201820587065 U CN 201820587065U CN 208763603 U CN208763603 U CN 208763603U
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- screw thread
- internal screw
- end portion
- drilling tool
- slot
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Abstract
The utility model discloses a kind of new drilling tool internal screw thread stress to disperse slot structure, including outer surface, inner surface and front end portion, the outer surface is structure as a whole with inner surface, the outer surface structure cylindrical, the inner surface successively includes the first inner surface along front end portion, second inner surface and third inner surface and the 4th inner surface, first inner surface of the inner surface is equipped with internal screw thread, the vertical range of first inner surface and outer surface is in the trend being gradually increased along the direction far from front end portion, stress dispersion slot can improve the performance of drill collar connecting portion, the fatigue damage flexure cycles that can be compared are 393000 times (band API stress dispersion slots) and 240000 times (without stress dispersion slot) respectively, disperse slot structure using internal and external threads stress, the fatigue resistance of threaded connection can be mentioned significantly It is high.
Description
Technical field
The utility model relates to drilling tool technical field more particularly to a kind of new drilling tool internal screw thread stress dispersion slot knots
Structure.
Background technique
In Process of Oil Well Drilling, the main function of drill collar is to apply enough bit pressures to drill bit, to be crushed bottom rock,
It realizes drilling, while the vibration, swing and bounce etc. for mitigating drill bit, makes drill bit smooth working.Drill string bears to stretch, bending, turn round
Turn, a variety of load such as internal pressure, external pressure, operating condition is severe, therefore drilling tool failure accident often occurs in bottomhole assembly.And it bores
Quickly damage is substantially all generation in drill collar threads connection place, when the internal and external threads connection without stress dispersion slot, internal and external threads
Tired area, which has been easy to appear, hurts defect, fatigue fracture.Internal screw thread hydrophthalmia end does not have garden degree of slipping over, and not can be reduced vortex, thus
Generating " involving phenomenon in hole " on hydro science causes threaded line crackle and hole to pierce leakage.When the internal and external threads with stress dispersion slot connect
It connects, when screw thread needs to repair every time, needs to remove partial-length, drill collar, which will be shorter than 8m, to scrap.
Utility model content
The purpose of utility model is to solve the disadvantage that background exists, and proposes the external screw thread without stress-relief groove, is allowed outer
Screw strength is higher, and a kind of new drilling tool internal screw thread stress of internal screw thread low strength disperses slot structure, including outer surface, interior table
Face and front end portion, the outer surface are structure as a whole with inner surface, the outer surface structure cylindrical, the inner surface edge
Front end portion successively includes the first inner surface, the second inner surface and third inner surface and the 4th inner surface, and the of the inner surface
One inner surface is equipped with internal screw thread, and the direction of the separate front end portion in the vertical range edge of first inner surface and outer surface is in gradually
The trend of increase, second inner surface are parallel to outer surface, and the third inner surface, the 4th inner surface are vertical with outer surface
Distance is in the trend that is gradually increased along the direction far from front end portion, and the angle of the 4th inner surface and third inner surface is in blunt
Angle, the front end portion is perpendicular to the outer surface, first inner surface, the second inner surface, in third inner surface and the 4th
Surface is sequentially connected composition stress dispersion slot, the U-shaped structure of stress dispersion slot.
The utility model is further described, the outer surface is provided with groove or the outer surface in one layer of ladder
Type structure or the outer surface are in the horizontal structure of un-grooved.
The utility model is further described, the junction of the front end portion and outer surface is in smooth arc-shaped.
The utility model is further described, the length of first inner surface is greater than table in the second inner surface, third
Face and the 4th inner surface.
The utility model is further described, the vertical range of the 4th inner surface away from outer surface is greater than table in third
The vertical range of face, the second inner surface, the first inner surface away from outer surface.
By adopting the above technical scheme, it has the following beneficial effects:
The utility model is higher by external screw thread intensity, internal screw thread low strength, including internal screw thread bending stress occurs at this time
Screw thread stressed zone, because there is the presence of stress dispersion slot, the drilling tool thread fatiguability area rupture failure time is greatly prolonged, and is enhanced
Service life, the machining stress dispersion slot at not intermeshing screw thread on external screw thread and internal screw thread can improve drill collar connection
The performance at position, the fatigue damage flexure cycles that can be compared are 393000 times (band API stress dispersion slots) and 240000 respectively
Secondary (without stress dispersion slot) disperses slot structure using internal and external threads stress, and the fatigue resistance of threaded connection can significantly improve.
Detailed description of the invention
Fig. 1 is the cross section structure schematic diagram 1 of the utility model；
Fig. 2 is the cross section structure schematic diagram 2 of the utility model；
Fig. 3 is the cross section structure schematic diagram 3 of the utility model；
Fig. 4 is the stress dispersion slot outer diameter optimum value table of the utility model；
1- stress dispersion slot；The outer surface 2-；31- groove；4- internal screw thread；The front end portion 5-；The 4th inner surface of 6-；7- first
Inner surface；The second inner surface of 8-；9- third inner surface；32- forge piece of step type structure；33- horizontal structure.
Specific embodiment
The utility model is described further with reference to the accompanying drawing.
Embodiment 1: a kind of new drilling tool internal screw thread stress as shown in Figure 1 disperses slot structure, including outer surface 2, interior table
Face and front end portion 5, the outer surface 2 are structure as a whole with inner surface, the outer surface 2 structure cylindrical, the interior table
Face successively includes the first inner surface 7, the second inner surface 8 and third inner surface 9 and the 4th inner surface 6 along front end portion 5, described interior
First inner surface 7 on surface is equipped with internal screw thread 4, the separate front end portion in vertical range edge of first inner surface 7 and outer surface 2
5 direction is in the trend being gradually increased, and second inner surface 8 is parallel to outer surface 2, table in the third inner surface the 9, the 4th
The vertical range of face 6 and outer surface 2 is in the trend being gradually increased along the direction far from front end portion 5, the 4th inner surface 6 with
In obtuse angle, the front end portion 5 is perpendicular to the outer surface 2, in first inner surface 7, second for the angle of third inner surface 9
Surface 8, third inner surface 9 and the 4th inner surface 6 are sequentially connected composition stress dispersion slot 1, the U-shaped knot of the stress dispersion slot 1
Structure, the outer surface 2 are provided with groove 31, and the junction of the front end portion 5 and outer surface 2 is in smooth arc-shaped, and described the
The length of one inner surface 7 is greater than the second inner surface 8, third inner surface 9 and the 4th inner surface 6, and the 4th inner surface 6 is away from appearance
The vertical range in face 2 is greater than third inner surface 9, the second inner surface 8, the first vertical range of the inner surface 7 away from outer surface 2.
Embodiment 2: a kind of new drilling tool internal screw thread stress as shown in Figure 2 disperses slot structure, including outer surface 2, interior table
Face and front end portion 5, the outer surface 2 are structure as a whole with inner surface, the outer surface 2 structure cylindrical, the interior table
Face successively includes the first inner surface 7, the second inner surface 8 and third inner surface 9 and the 4th inner surface 6 along front end portion 5, described interior
First inner surface 7 on surface is equipped with internal screw thread 4, the separate front end portion in vertical range edge of first inner surface 7 and outer surface 2
5 direction is in the trend being gradually increased, and second inner surface 8 is parallel to outer surface 2, table in the third inner surface the 9, the 4th
The vertical range of face 6 and outer surface 2 is in the trend being gradually increased along the direction far from front end portion 5, the 4th inner surface 6 with
In obtuse angle, the front end portion 5 is perpendicular to the outer surface 2, in first inner surface 7, second for the angle of third inner surface 9
Surface 8, third inner surface 9 and the 4th inner surface 6 are sequentially connected composition stress dispersion slot 1, the U-shaped knot of the stress dispersion slot 1
Structure, the outer surface 2 are in one layer of forge piece of step type structure 32, and the junction of the front end portion 5 and outer surface 2 is in smooth circular arc
Shape, the length of first inner surface 7 are greater than the second inner surface 8, third inner surface 9 and the 4th inner surface 6, table in the described 4th
Vertical range of the face 6 away from outer surface 2 is greater than third inner surface 9, the second inner surface 8, the first inner surface 7 away from the vertical of outer surface 2
Distance.
Embodiment 3: a kind of new drilling tool internal screw thread stress as shown in Figure 3 disperses slot structure, including outer surface 2, interior table
Face and front end portion 5, the outer surface 2 are structure as a whole with inner surface, the outer surface 2 structure cylindrical, the interior table
Face successively includes the first inner surface 7, the second inner surface 8 and third inner surface 9 and the 4th inner surface 6 along front end portion 5, described interior
First inner surface 7 on surface is equipped with internal screw thread 4, the separate front end portion in vertical range edge of first inner surface 7 and outer surface 2
5 direction is in the trend being gradually increased, and second inner surface 8 is parallel to outer surface 2, table in the third inner surface the 9, the 4th
The vertical range of face 6 and outer surface 2 is in the trend being gradually increased along the direction far from front end portion 5, the 4th inner surface 6 with
In obtuse angle, the front end portion 5 is perpendicular to the outer surface 2, in first inner surface 7, second for the angle of third inner surface 9
Surface 8, third inner surface 9 and the 4th inner surface 6 are sequentially connected composition stress dispersion slot 1, the U-shaped knot of the stress dispersion slot 1
Structure, the outer surface 2 are in the horizontal structure 33 of un-grooved 31, and the junction of the front end portion 5 and outer surface 2 is in smooth circle
Arcuation, the length of first inner surface 7 are greater than the second inner surface 8, third inner surface 9 and the 4th inner surface 6, in the described 4th
Vertical range of the surface 6 away from outer surface 2 is greater than third inner surface 9, the second inner surface 8, the first inner surface 7 and hangs down away from outer surface 2
Straight distance.
According to drill collar bending strength ratio calculation formula, when drill collar internal and external threads connect, the size of bending strength ratio is determined
The bend fracture of drill collar internal and external threads is orientated, and when bending strength ratio is greater than 2.5, then internal screw thread semi-finals degree is bigger than normal, then being bent will send out
It is raw that big stress concentration is generated in male connection root, make external screw thread fatigue rupture.Conversely, when bending strength ratio is less than 2.5
When, then external screw thread intensity is bigger than normal, then bending will occur in 4 root of joint of internal screw thread and external screw thread small end nearby generates big stress
It concentrates, makes 4 fatigue rupture of internal screw thread.After use after a period of time, drilling tool outer diameter inherently grinds small drilling tool, and compares drill collar
Hydrophthalmia abrasion wants much faster, and other sizes are basically unchanged, so the size of drill collar outer diameter, determines the big of bending strength ratio
It is small.
It is connected with each other between the internal and external threads of same model and is constantly exchanging, it is curved between the connection of down-hole equipment internal and external threads
Bent intensity rate is not the same because drilling tool outer diameter, internal diameter, external thread length and chamfering, 4 Opening length of internal screw thread and fall
Angle, drilling tool internal-and external diameter all determine the bending strength ratio actual value between the internal and external threads being connected with the concentricity of screw thread.It is interior
4 stress dispersion slot of screw thread, 1 Structural design idea selects the drilling tool maximum inner diameter value in actual use to be less than in bending strength ratio
Preferred outside diameter value when 2.5:1 cooperates, it is therefore an objective to guarantee that external screw thread intensity is bigger than normal, while guarantee 4 stress dispersion slot of internal screw thread, 1 knot
The intensity of structure is in API RP 7G recommended range.
When drilling tool outer diameter is less than and is equal to Fig. 4 outer diameter, internal and external threads connection is carried out using Fig. 3.
When drilling tool outer diameter is greater than Fig. 4 outer diameter, internal and external threads are carried out with Fig. 3 using Fig. 2 and are connected.
The utility model is higher by external screw thread intensity, and internal screw thread semi-finals degree is relatively low, and 4 bending stress of internal screw thread occurs at this time
4 stressed zone of internal screw thread, because there is the presence of stress dispersion slot 1, the drilling tool thread fatiguability area rupture failure time is greatly prolonged.
The foregoing describe the basic principles and main features of the utility model, It should be understood by those skilled in the art that this
Utility model is not restricted to the described embodiments, and the above embodiments and description only describe the originals of the utility model
Reason, on the premise of not departing from the spirit and scope of the utility model, the utility model also has various changes and improvements, these changes
Change and improvement is fallen within the scope of the claimed invention, range is claimed by the attached claims in utility model
Book and its equivalent thereof.
Claims (5)
1. a kind of new drilling tool internal screw thread stress disperses slot structure, including outer surface (2), inner surface and front end portion (5), it is special
Sign is that the outer surface (2) is structure as a whole with inner surface, the outer surface (2) structure cylindrical, the inner surface edge
Front end portion (5) successively includes the first inner surface (7), the second inner surface (8) and third inner surface (9) and the 4th inner surface (6),
The first inner surface (7) of the inner surface is equipped with internal screw thread (4), the vertical range of first inner surface (7) and outer surface (2)
It is in the trend being gradually increased along the direction far from front end portion (5), second inner surface (8) is parallel to outer surface (2), described
The vertical range of third inner surface (9), the 4th inner surface (6) and outer surface (2) is along the direction far from front end portion (5) in gradually
The trend of increase, the angle of the 4th inner surface (6) and third inner surface (9) in obtuse angle, the front end portion (5) perpendicular to
The outer surface (2), first inner surface (7), the second inner surface (8), third inner surface (9) and the 4th inner surface (6) according to
Secondary connection forms stress dispersion slot (1), the U-shaped structure of the stress dispersion slot (1).
2. a kind of new drilling tool internal screw thread stress according to claim 1 disperses slot structure, which is characterized in that the appearance
Face (2) is provided with groove (31), and perhaps the outer surface (2) is in one layer of forge piece of step type structure (32) or the outer surface (2) in nothing
The horizontal structure (33) of groove (31).
3. a kind of new drilling tool internal screw thread stress according to claim 1 disperses slot structure, which is characterized in that the front end
Partially the junction of (5) and outer surface (2) is in smooth arc-shaped.
4. a kind of new drilling tool internal screw thread stress according to claim 1 disperses slot structure, which is characterized in that described first
The length of inner surface (7) is greater than the second inner surface (8), third inner surface (9) and the 4th inner surface (6).
5. a kind of new drilling tool internal screw thread stress according to claim 1 disperses slot structure, which is characterized in that the described 4th
Vertical range of the inner surface (6) away from outer surface (2) be greater than third inner surface (9), the second inner surface (8), the first inner surface (7) away from
The vertical range of outer surface (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820587065.4U CN208763603U (en) | 2018-04-24 | 2018-04-24 | A kind of new drilling tool internal screw thread stress dispersion slot structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820587065.4U CN208763603U (en) | 2018-04-24 | 2018-04-24 | A kind of new drilling tool internal screw thread stress dispersion slot structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208763603U true CN208763603U (en) | 2019-04-19 |
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ID=66125563
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820587065.4U Expired - Fee Related CN208763603U (en) | 2018-04-24 | 2018-04-24 | A kind of new drilling tool internal screw thread stress dispersion slot structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208763603U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110847828A (en) * | 2019-12-11 | 2020-02-28 | 库尔勒施得石油技术服务有限公司 | Drilling tool external thread stress dispersion groove and repairing method thereof |
-
2018
- 2018-04-24 CN CN201820587065.4U patent/CN208763603U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110847828A (en) * | 2019-12-11 | 2020-02-28 | 库尔勒施得石油技术服务有限公司 | Drilling tool external thread stress dispersion groove and repairing method thereof |
| CN110847828B (en) * | 2019-12-11 | 2021-03-02 | 库尔勒施得石油技术服务有限公司 | Drilling tool external thread stress dispersion groove and repairing method thereof |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190419 Termination date: 20210424 |