CN202176272U - Novel petroleum drill collar joint - Google Patents
Novel petroleum drill collar joint Download PDFInfo
- Publication number
- CN202176272U CN202176272U CN2011202540896U CN201120254089U CN202176272U CN 202176272 U CN202176272 U CN 202176272U CN 2011202540896 U CN2011202540896 U CN 2011202540896U CN 201120254089 U CN201120254089 U CN 201120254089U CN 202176272 U CN202176272 U CN 202176272U
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- CN
- China
- Prior art keywords
- shoulder
- drill collar
- screw thread
- joint
- head end
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model relates to a novel petroleum drill collar joint, including an outer joint and an inner joint. The outer joint is connected with the inner joint through a taper screw thread. The novel petroleum drill collar joint is characterized in that the large head end of the taper screw thread of the outer joint is provided with a shoulder I, and the small head end is provided with a convex platform I, the small head end of the taper screw thread of the inner joint is provided with a shoulder II, and the large head end is provided with a convex platform II, and when the shoulder I is tightly contacted to the convex platform I, a slit Delta (L) is provided between the shoulder II and the convex platform I. The slit Delta (L) is in the range from 0 to 0.5 mm. Compared to the prior art, the beneficial effects in the utility model is as following: 1) with the double-shoulder structure, the sectional area of the screw thread is increased, the strength of the screw thread connection of the drill collar is enhanced, the usage life of the drill collar is prolonged, and the number of under-drill accidents is reduced; 2) the usage, storage and transportation of the double-shoulder drill collar screw thread is the same to a common screw thread, and the novel petroleum drill collar joint can be used with the prior drilling tool with the same screw thread type; and 3) the double-shoulder drill collar screw thread can be maintained in the same way to an API screw thread after being damaged.
Description
Technical field
The utility model relates to oil and gas well drilling mining equipment field, particularly a kind of nonpetroleum drill collar joint.
Background technology
The load that stone oil drill collar bears in drilling process is complicacy, particularly drill collar joint very, the effect of bearing interior pressure, external pressure, axial load, bending load and moment of torsion simultaneously, moreover; Drill collar is also bearing the effect of dynamic load in drilling process, under the complex load effect, and the phenomenon ubiquity of drill collar generation fracture failure; Drilling practice through long-term shows that drill collar joint screw thread position cross sectional shape changes, and stress is concentrated serious; Simultaneously also higher alternating stresses can occur, be the most dangerous stressed position, fatigue fracture very easily occurs; Therefore, reducing the stress of drill collar joint screw connection point and concentrate, is the key point that solves the drill collar Problem of Failure.
At present, in order to improve the anti-fatigue performance of drill collar threads, often be employed near external screw thread shoulder place and internal thread root method of machining stress dispersion slot all, the method is effective, but its drawback is also arranged: the one, and the machining stress dispersion slot can aggravate stress and concentrate; The 2nd, in case the drill collar thread damage of machining stress dispersion slot needs to repair, to cut the screw thread of 100-130mm at least, the drill collar waste of material is quite big, and has further shortened the application life of drill collar.
Summary of the invention
The purpose of the utility model provides a kind of nonpetroleum drill collar joint, overcomes the deficiency of prior art, from improving the screw thread load distribution, reducing the stress raisers aspect and start with, improves the drill collar life-span, reduces down-hole accident.
For solving the problems of the technologies described above, the technical scheme of the utility model is:
A kind of nonpetroleum drill collar joint comprises socket and spigot, and socket is connected through tapered thread with spigot, and the stub end of socket tapered thread is provided with shoulder one, and little head end is provided with boss one; The little head end of spigot tapered thread is provided with shoulder two, and stub end is provided with boss two, and shoulder one and boss two lean on when tight, are provided with slit Δ L between shoulder two and the boss one.
Said slit Δ L scope is 0-0.5mm.
Compared with prior art, the beneficial effect of the utility model is: 1) two shoulder structures have increased the sectional area of screw thread, have improved the intensity of drill collar threads junction, can prolong the drill collar life-span, reduce down-hole accident.2) two shoulder screw threads can be processed on Digit Control Machine Tool, save labor.3) use of two shouldered drill collar screw threads, keeping and transportation are the same with regular screw threads, can use together with the drilling tool of existing identical form of thread.When 4) repairing behind two shouldered drill collar thread abrasions, also can equally with the API screw thread repair screw thread, can not cut drill collar more because of the change of structure.
Description of drawings
Fig. 1 is the utility model example structure sketch map.
Among the figure: 1-socket 2-spigot 3-tapered thread 4-shoulder one 5-boss one 6-shoulder two 7-boss two
The specific embodiment
Be described further below in conjunction with the specific embodiment of accompanying drawing the utility model:
See Fig. 1; Be a kind of nonpetroleum drill collar joint of the utility model example structure sketch map, comprise socket 1 and spigot 2, socket 1 is connected through tapered thread 3 with spigot 2; The stub end of socket 1 tapered thread is provided with shoulder 1, and little head end is provided with boss 1; The little head end of spigot 2 tapered threads is provided with shoulder 26, and stub end is provided with boss 27, and shoulder 1 and boss 27 lean on when tight, are provided with slit Δ L between shoulder 26 and the boss 1.
Slit Δ L scope is 0-0.5mm; Δ L should equal to go up from shoulder 1 top the decrement when screwing to prescribed torque; Its principle is just to have pushed up last time at shoulder 1, and shoulder 26 pushes up simultaneously or leaves a minim gap (Δ L), when continuing to screw prescribed torque; Shoulder 26 holds out against just, realizes smooth connection.
When drill collar bear stretching, bending in the down-hole, when load such as reversing, shoulder 26 and shoulder one 4 the same working.Adopt such thread connecting mode, increased the sectional area of screw thread, improved the intensity of drill collar threads junction, simultaneously, adopt this thread connecting mode also to reduce the probability that external screw thread lost efficacy.Because high-strength drill collar threaded connection has two torque shoulder, the stress value of corresponding dispersion shoulder one 4 near zones of shoulder 26 meetings, thus can reduce apart near the externally threaded failure probability in 1-the 3rd tooth places shoulder 1.
Claims (2)
1. a nonpetroleum drill collar joint comprises socket and spigot, and socket is connected through tapered thread with spigot, it is characterized in that, the stub end of socket tapered thread is provided with shoulder one, and little head end is provided with boss one; The little head end of spigot tapered thread is provided with shoulder two, and stub end is provided with boss two, and shoulder one and boss two lean on when tight, are provided with slit Δ L between shoulder two and the boss one.
2. a kind of nonpetroleum drill collar joint according to claim 1 is characterized in that, said slit Δ L scope is 0-0.5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202540896U CN202176272U (en) | 2011-07-18 | 2011-07-18 | Novel petroleum drill collar joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202540896U CN202176272U (en) | 2011-07-18 | 2011-07-18 | Novel petroleum drill collar joint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202176272U true CN202176272U (en) | 2012-03-28 |
Family
ID=45866157
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202540896U Expired - Fee Related CN202176272U (en) | 2011-07-18 | 2011-07-18 | Novel petroleum drill collar joint |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202176272U (en) |
-
2011
- 2011-07-18 CN CN2011202540896U patent/CN202176272U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| 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: 20120328 Termination date: 20180718 |