CN201620770U - Anti-fatigue drilling tool joint with external threads - Google Patents
Anti-fatigue drilling tool joint with external threads Download PDFInfo
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- CN201620770U CN201620770U CN2010201195324U CN201020119532U CN201620770U CN 201620770 U CN201620770 U CN 201620770U CN 2010201195324 U CN2010201195324 U CN 2010201195324U CN 201020119532 U CN201020119532 U CN 201020119532U CN 201620770 U CN201620770 U CN 201620770U
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Abstract
An anti-fatigue drilling tool joint with external threads is applied to underground drilling tools for oil drilling, and mainly comprises an external thread end, a stress dispersing slot and an external thread joint torque shoulder, wherein the stress dispersing slot is arranged from the root of the external thread end to the last meshing thread position in an extended manner and has a length ranging from 15mm to 50mm and a depth ranging from 0.5mm to 3.5mm, the depth of the stress dispersing slot is no larger than the bottoms of the threads, smooth transition is formed between the stress dispersing slot and a complete thread position, the length of the transition section ranges from 5mm to 25mm, the stress dispersing slot is rounded at the root of the external thread end, the radius of a transition arc ranges from 2mm to 16mm, the transition arc is tangential to the bottom of the stress dispersing slot, and the distance from the stress dispersing slot to the external thread joint torque shoulder is smaller than 2mm.The anti-fatigue drilling tool joint has the advantages that the stress dispersing slot 2 is shallow and wide, threads at the last meshing thread position are still available for meshing, finite element stress analysis shows that thread stress distribution is evidently improved, and load of the last meshing threads is evidently reduced.
Description
Technical field
The utility model relates to the petroleum drilling engineering field, and particularly down-hole equipment is a kind of drilling tool male connection.
Background technology
At present, in recent years, the oil gas drilling environment is harsh day by day, and the oil gas well depth constantly increases, and deep-well, directional well, horizontal well are on the increase, and operating mode is complicated more, and drilling tool fracture failure accident frequently takes place, and wherein much belongs to the fatigue fracture of male connection.Because the maldistribution of load on each ridge, wherein the last thread engagement place ridge of male connection has born most load, so the male connection fatigue fracture often takes place, fracture position is thread engagement place in the end just.So improve the load distribution of ridge, reduce last thread engagement place ridge load and just become to improve the drilling tool male connection main path of fatigue life.U.S. API standard A PI SPEC 7 has recommended a kind of drilling tool male connection stress dispersion slot, this stress dispersion slot is positioned at the big end root of external screw thread, wide 15.4mm, the degree of depth surpasses Bottom of Thread, shows that this stress dispersion slot only improves the life-span about 50%, can not satisfy actual needs but use, and because the degree of depth surpasses Bottom of Thread, need cut away whole screw thread tapering when repairing screw thread again, reduce the number of times repaired of drilling tool on the contrary, reduce the application life of drilling tool.So design and a kind ofly can increase substantially the screw thread anti-fatigue performance, and do not influence screw thread and repair the stress dispersed structure in life-span and be significant.
The utility model content
The purpose of this utility model is: a kind of drilling tool male connection of antifatigue is provided, and significantly improve its fatigue life, exchanges fully with the API standard thread, reduces screw thread and repair cutting output.
The technical solution adopted in the utility model is: the drilling tool male connection of antifatigue, mainly be made up of male end, stress dispersion slot and male connection torque shoulder, it is characterized in that: extending to last thread engagement place at the male end root has the stress dispersion slot; Described stress dispersion slot length is between 15～50mm; The stress dispersion slot degree of depth is between 0.5～3.5mm, and the stress dispersion slot degree of depth is no more than Bottom of Thread; The mild transition of stress dispersion slot and complete thread place, transition section length is between 5～25mm; The stress dispersion slot is at male end root rounding off, and transition arc radius is between 2～16mm, and is and tangent at the bottom of this transition arc and the stress dispersion slot; The stress dispersion slot apart from the distance of male connection torque shoulder less than 2mm.
When the stress dispersion slot when the distance of male connection torque shoulder is 0mm, anti-fatigue performance is best.
Those skilled in the art know other structures of drilling tool male connection, are not described in detail.
The beneficial effects of the utility model: the drilling tool male connection stress of API standard recommendation disperses groove depth and narrow, improved the screw thread stress distribution to a certain extent, but because this stress dispersion slot degree of depth surpasses Bottom of Thread, so originally last thread engagement place has a few circle screw threads no longer to mesh, therefore it is limited to improve screw thread stress distribution effect, and it is not remarkable fatigue life to improve screw thread.The stress dispersion slot of the drilling tool male connection of antifatigue of the present invention is shallow and wide, and last thread engagement place screw thread still meshes, and finite element stress analysis shows that the screw thread stress distribution is significantly improved, and last thread engagement load obviously descends.
Full-scale drilling tool fatigue life and stretch test result show (see Table 1, table 2), and the drilling tool male connection anti-fatigue performance of antifatigue of the present invention is doubled and redoubled, and hot strength is not affected.
The full-scale drilling tool anti-fatigue performance of table 1 result of the test
| Specimen coding | Screw thread | Fracture position | Fatigue life (drilling tool number of revolutions) |
| 1 | API NC screw thread | The external screw thread root | 3.3×10 5 |
| 2 | API NC screw thread | The external screw thread root | 3.9×10 5 |
| 3 | High fatigue life screw thread of the present invention | The external screw thread root | 5.6×10 6 |
| 4 | High fatigue life screw thread of the present invention | The external screw thread root | 4.7×10 6 |
The full-scale drill collar stretch test result of table 2
The wellbore test effect:
(1) oil field, Tarim Basin YH23-2-10 well test effect: drilling tool external screw thread (oil field the is called the LET button) drilling tool that this well has spudded in for the second time and all adopted antifatigue of the present invention, drilling tool accident does not together take place, flaw detection also finds no wound, has improved the drilling well timeliness greatly.This well is from the completion of spudding in, and the production timeliness reaches 98.6%, and pure brill timeliness reaches 61.1%.This well shifts to an earlier date 37 days completions than the design duration, brings bigger economic benefit.
Also be furnished with other two mouthfuls of wells at that time in the YH23 wellblock, because they are the same with the strata condition and the casing programme of YH23-2-10 well, but two mouthfuls of wells all adopt regular screw threads joint drilling tool.Therefore, the operating mode of drilling tool and YH23-2-10 well are basic identical, the YH23-1-18 well newly repair the button drilling tool go into well less than the trimestral time in, with regard to 6 of drillling tool twisting off joints, flaw detection is found to have and is hindered 3.The YH23-1-22 well newly repair the button drilling tool go into well less than the trimestral time in, with regard to 2 of drillling tool twisting off joints, flaw detection is found to have and is hindered 9.
YH23-2-10 and YH23-1-18, YH23-1-22 are under identical wellblock, similar operating condition, and common drilling tool nipple repeatedly fracture accident just occurs when using a wheat harvesting period, repeatedly find fatigue crack when drilling tool is detected a flaw.Fracture accident does not only take place in the drilling tool male connection of antifatigue of the present invention (oil field is called the LET button) drilling tool, and do not find crackle, show that the fatigue life ratio regular screw threads of drilling tool male connection (oil field be called LET button) of antifatigue of the present invention are obviously high.
(2) oil field, Tarim Basin BD-4 well test effect: this well is not before adopting the drilling tool male connection drilling tool of antifatigue of the present invention, 3 drill collar fracture accidents have taken place, and in less than 3 months time, when flaw detection find that drill collar has a fatigue crack just have 21, especially only 11 day time was just found that drilling tool has and hinders 16.And after adopting the drilling tool male connection drilling tool of antifatigue of the present invention, in nearly 5 months time, find that drilling tool has only 16 of wounds, and the drilling tool fracture accident does not take place.Show under abominable drilling condition, adopt improve a lot the fatigue life of the drilling tool male connection drilling tool of antifatigue of the present invention.
Test effect shows:
(1) the drilling tool male connection screw thread of antifatigue of the present invention significantly improves drilling tool antifatigue life performance, and the trend that drilling tool ruptures, occurs fatigue crack significantly reduces;
(2) the drilling tool male connection of antifatigue of the present invention and API standard thread joint exchange fully.With the API joint identical last shackle operation is arranged and draw, press, bend, turn round, performance such as sealing;
(3) compare with API standard stress-relief groove, the drilling tool male connection feature structure of antifatigue of the present invention has reduced the drilling tool screw thread and has repaired cutting output, has prolonged the terminal life of bottom drill tools such as drill collar, centralizer, crossover sub.Have the drilling tool male connection of API standard stress-relief groove must cut away whole nipple when repairing, machining screw makes drilling tool length obviously shorten again, reduces the application life of drilling tool.And the drilling tool male connection of antifatigue of the present invention needn't be cut away whole nipple when repairing at every turn, only needs that a feed get final product several times on original thread, has obviously prolonged the life-span of drilling tool.
Description of drawings
Fig. 1 is the drilling tool male connection structural profile schematic diagram of the utility model antifatigue.
Fig. 2 is the drilling tool male connection of the utility model antifatigue, the structural profile schematic diagram of stress dispersion slot 2 when the distance of male connection torque shoulder 3 is 0mm.
Among the figure, 1. male end, 2. stress dispersion slot, 3. male connection torque shoulder.L: stress dispersion slot 2 length; H: stress dispersion slot 2 degree of depth; L2: stress dispersion slot 2 and complete thread place transition section length; R: stress dispersion slot 2 is at the transition arc radius of male end 1 root; L1: stress dispersion slot 2 is apart from the distance of male connection torque shoulder 3;
The specific embodiment
Drilling tool male connection with antifatigue is an example, and the utility model is described in further detail.
Embodiment 1: consult Fig. 1.The male connection of high fatigue life drilling rod, thread forms is V-0.050, the joint specification is 65/8REG.
The drilling tool male connection of antifatigue mainly is made up of male end 1, stress dispersion slot 2 and male connection torque shoulder 3, and extending to last thread engagement from male end 1 root has stress dispersion slot 2; Described stress dispersion slot 2 length L=20mm; Described stress dispersion slot 2 degree of depth h=3.0mm; Described stress dispersion slot 2 and the mild transition in complete thread place, transition section length is L2=20mm; Described stress dispersion slot 2 is at the big end root of external screw thread rounding off, transition arc radius R=10mm, and the bottom land of this transition arc and stress dispersion slot 2 is tangent; Described stress dispersion slot 2 is 1.5mm apart from external screw thread torque shoulder 3 distance L 1.
At first machine the API standard thread, tool changing processes the externally threaded feature structure of the drilling tool male connection-stress dispersion slot of antifatigue of the present invention then.
Embodiment 2: consult Fig. 1.The drilling tool male connection of the utility model antifatigue, thread forms is V-0.040, the joint specification is 27/8REG.
The drilling tool male connection of antifatigue mainly is made up of male end 1, stress dispersion slot 2 and male connection torque shoulder 3, extends to the stress dispersion slot 2 of last thread engagement from male end 1 root; Described stress dispersion slot 2 length L=40mm; Described stress dispersion slot 2 degree of depth h=1.0mm; Described stress dispersion slot 2 and the mild transition in complete thread place, transition section length L2=6mm; Described stress dispersion slot 2 is at the big end root of external screw thread rounding off, transition arc radius R=2mm, and the bottom land of this transition arc and stress dispersion slot 2 is tangent; Described stress dispersion slot 2 is 1mm apart from external screw thread torque shoulder 3 distance L 1.
Embodiment 3: consult Fig. 2.The male connection of high fatigue life drill collar, thread forms is V-0.038R, the joint specification is NC50.
The drilling tool male connection of antifatigue mainly is made up of male end 1, stress dispersion slot 2 and male connection torque shoulder 3, extends to the stress dispersion slot 2 of last thread engagement from male end 1 root; Described stress dispersion slot 2 length L=25mm; Described stress dispersion slot 2 degree of depth h=1.6mm; Described stress dispersion slot 2 and the mild transition in complete thread place, transition section length L2=15mm; Described stress dispersion slot 2 is at the big end root of external screw thread rounding off, transition arc radius R=6mm, and the bottom land of this transition arc and stress dispersion slot 2 is tangent; Described stress component of stress dispersion slot 2 is 0mm apart from the distance of male connection torque shoulder 3, and promptly stress dispersion slot 2 is tangent in the circular arc and the torque shoulder 3 of the big end root of external screw thread.
Claims (2)
1. the drilling tool male connection of an antifatigue, mainly be made up of male end (1), stress dispersion slot (2) and male connection torque shoulder (3), it is characterized in that: extending to last thread engagement place at male end (1) root has stress dispersion slot (2); Described stress dispersion slot (2) length is between 15～50mm; Stress dispersion slot (2) degree of depth is between 0.5～3.5mm, and stress dispersion slot (2) degree of depth is no more than Bottom of Thread; Stress dispersion slot (2) and the mild transition in complete thread place, transition section length is between 5～25mm; Stress dispersion slot (2) is at male end (1) root rounding off, and transition arc radius is between 2～16mm, and this transition arc and stress dispersion slot (2) bottom land are tangent; Stress dispersion slot (2) apart from the distance of male connection torque shoulder (3) less than 2mm.
2. the drilling tool male connection of antifatigue according to claim 1 is characterized in that: stress dispersion slot (2) is 0mm apart from the distance of male connection torque shoulder (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201195324U CN201620770U (en) | 2010-02-25 | 2010-02-25 | Anti-fatigue drilling tool joint with external threads |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201195324U CN201620770U (en) | 2010-02-25 | 2010-02-25 | Anti-fatigue drilling tool joint with external threads |
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| Publication Number | Publication Date |
|---|---|
| CN201620770U true CN201620770U (en) | 2010-11-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201195324U Expired - Lifetime CN201620770U (en) | 2010-02-25 | 2010-02-25 | Anti-fatigue drilling tool joint with external threads |
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| CN (1) | CN201620770U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104499956A (en) * | 2014-11-19 | 2015-04-08 | 上海大学 | High-performance special thread tool joint |
| CN108166937A (en) * | 2018-03-07 | 2018-06-15 | 上海海隆石油管材研究所 | High torque highly anti-fatigue type nipple |
| CN109723391A (en) * | 2017-10-30 | 2019-05-07 | Octg联系有限责任公司 | Screw-type box cupling and its system and the method for manufacturing screw-type box cupling |
-
2010
- 2010-02-25 CN CN2010201195324U patent/CN201620770U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104499956A (en) * | 2014-11-19 | 2015-04-08 | 上海大学 | High-performance special thread tool joint |
| CN104499956B (en) * | 2014-11-19 | 2017-06-06 | 上海大学 | A kind of high-performance special thread tool joint |
| CN109723391A (en) * | 2017-10-30 | 2019-05-07 | Octg联系有限责任公司 | Screw-type box cupling and its system and the method for manufacturing screw-type box cupling |
| CN109723391B (en) * | 2017-10-30 | 2021-04-09 | Octg联系有限责任公司 | Threaded coupling, system thereof and method for manufacturing threaded coupling |
| CN108166937A (en) * | 2018-03-07 | 2018-06-15 | 上海海隆石油管材研究所 | High torque highly anti-fatigue type nipple |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20101103 |