CN202731770U - Drilling tool joint with stress reduction groove arranged in outer threads - Google Patents
Drilling tool joint with stress reduction groove arranged in outer threads Download PDFInfo
- Publication number
- CN202731770U CN202731770U CN 201220258505 CN201220258505U CN202731770U CN 202731770 U CN202731770 U CN 202731770U CN 201220258505 CN201220258505 CN 201220258505 CN 201220258505 U CN201220258505 U CN 201220258505U CN 202731770 U CN202731770 U CN 202731770U
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Abstract
The utility model provides a drilling tool joint with a stress reduction groove arranged in outer threads and belongs to the technical field of oil drilling. Two ends of a joint body are respectively provided with an outer thread end and an inner thread end. An annular main should face is arranged at the root portion of the outer thread end, and an auxiliary shoulder face is arranged at the end portion of the outer thread end. Threads are arranged on the outer thread end and of taper threads. A stress groove machining plane is arranged on the threads, the distance of one end of the stress groove machining plane to the main shoulder face of the outer thread end is one third of the length of the threads, and the distance of the other end of the stress groove machining plane to the auxiliary shoulder face of the outer thread end is one third of the length of the threads. A conical degree of the stress groove machining plane is the same as that of the threads, and the height of the stress groove machining plane is two thirds of that of a thread form. The drilling tool joint with the stress reduction groove arranged in the outer threads has the advantages that certain gaps are reserved between the inner threads and the outer threads, flexibility of the thread portions is increased but torsion resistance strength of the threads is not reduced, and therefore the risk that double-shoulder threads are broken in the middle of the outer threads is greatly reduced.
Description
Technical field
The utility model relates to the petroleum drilling technology field, particularly a kind of pair of shoulder drilling tool.It is the tool joint that a kind of external screw thread has stress-relief groove.
Background technology
At present, two shoulder drilling tools are the application of existing comparative maturity in recent years, and its higher torsional property has obtained the generally approval of each elephant, but because its higher rigidity, the use procedure intermediate frequency living external screw thread fracture accident that takes place frequently.By statistics and the failure conditions at the fragile position of two shoulder drilling tool recovering states are analyzed, its fracture location multidigit is in external screw thread 6 to 9 buttons, the two externally threaded weak spots of shoulder of this explanation and unlike common external screw thread near large end starting buckle, and in the external screw thread middle part.
The utility model content
The purpose of this utility model is: the tool joint that provides a kind of external screw thread that stress-relief groove is arranged, the stress when reducing two shoulder drilling tools and bearing complex job in the down-hole is concentrated, and is anti-fracture in advance, prolongs two shoulder drilling tool application life.
The technical solution adopted in the utility model is: external screw thread has the tool joint of stress-relief groove, comprises fittings body, female end and male end, at the two ends of fittings body male end and female end is arranged respectively; Root in male end has annular main circular bead surface, and the main circular bead surface of annular is vertical with tool joint body center line; The secondary circular bead surface of annular is arranged in the end of male end, and the secondary circular bead surface of annular is vertical with tool joint body center line; In male end screw thread is arranged, screw thread is taper thread; It is characterized in that: at screw thread stress groove processing plane is arranged, an end of described stress groove processing plane is 1/3rd of reach to the distance of the main circular bead surface of male end; The other end of stress groove processing plane is 1/3rd of reach to the distance of the secondary circular bead surface of male end; The tapering of stress groove processing plane is identical with the tapering of screw thread, and the length of stress groove processing plane is reach 1/3rd, and the height of stress groove processing plane is 2/3rds of form of thread height.
The beneficial effects of the utility model: the utility model external screw thread has the tool joint of stress-relief groove, through field trial and theoretical calculating, this pair shoulder external screw thread stress-relief groove structure and the contrast of common double shoulder helicitic texture have following effect: in (1) common double shoulder, external screw thread is in flexural stress, draw, under the various complex load effects such as pressure, middle part screw thread generation gross distortion, after using two shoulder external screw thread stress-relief grooves, internal and external threads leaves a fixed gap, increased the flexibility at screw thread position, but do not reduce again the torsional strength of screw thread, greatly reduce the risk of outside threaded middle fracture of two shoulder screw threads.(2) reduce two shoulder internal and external screw threads and repair the button ratio.(3) by FEM (finite element) calculation, in simulation stretching, bending, the torsional load situation, two shoulder external screw thread maximum stresses reduce by 19.2% than common double shoulder screw thread maximum stress.
Description of drawings
Fig. 1 is the tool joint structural profile schematic diagram that the utility model external screw thread has stress-relief groove.
Among the figure, 1-master's circular bead surface, 2-original thread, 3-stress groove processing plane, 4-male end, the secondary circular bead surface of 5-.
The specific embodiment
Embodiment 1: the tool joint that stress-relief groove is arranged take an external screw thread is described in further detail the utility model as example.
Consult Fig. 1.The utility model external screw thread has the tool joint of stress-relief groove, comprises fittings body, female end and male end 4, at the two ends of fittings body male end 4 and female end is arranged respectively; Root in male end 4 has annular main circular bead surface 1, and the main circular bead surface 1 of annular is vertical with tool joint body center line; The secondary circular bead surface 5 of annular is arranged in the end of male end 4, and the secondary circular bead surface 5 of annular is vertical with tool joint body center line; In male end 4 screw thread 2 is arranged, screw thread 2 is taper threads.
At screw thread 2 conical stress groove processing plane 3 is arranged, an end of described stress groove processing plane 3 is 1/3rd of screw thread 2 length to the distance of the main circular bead surface 1 of male end 4.The other end of stress groove processing plane 3 is 1/3rd of screw thread 2 length to the distance of the secondary circular bead surface 5 of male end 4.The tapering of stress groove processing plane 3 is identical with the tapering of screw thread 2, and the length of stress groove processing plane 3 is screw thread 2 length 1/3rd, and the height of stress groove processing plane 3 is 2/3rds of screw thread 2 thread heights.
After machining 4 pairs of shoulder external screw threads of male end, prolong the turning of original thread taper direction in distance external screw thread master circular bead surface 1, distance for total length 1/3rd places, screw thread tapering, the turning Bock Altitude is 2/3rds of thread height, and turning length is 1/3rd of screw thread 2 tapering overall lengths.
Claims (1)
1. an external screw thread has the tool joint of stress-relief groove, comprises fittings body, female end and male end (4), at the two ends of fittings body male end (4) and female end is arranged respectively; Root in male end (4) has annular main circular bead surface (1), and the main circular bead surface (1) of annular is vertical with tool joint body center line; The secondary circular bead surface (5) of annular is arranged in the end of male end (4), and the secondary circular bead surface (5) of annular is vertical with tool joint body center line; In male end (4) screw thread (2) is arranged, screw thread (2) is taper thread; It is characterized in that: at screw thread (2) stress groove processing plane (3) is arranged, an end of described stress groove processing plane (3) is 1/3rd of screw thread (2) length to the distance of the main circular bead surface (1) of male end (4); The other end of stress groove processing plane (3) is 1/3rd of screw thread (2) length to the distance of the secondary circular bead surface (5) of male end (4); The tapering of stress groove processing plane (3) is identical with the tapering of screw thread (2), the length of stress groove processing plane (3) is screw thread (2) length 1/3rd, and the height of stress groove processing plane (3) is 2/3rds of screw thread (2) thread height.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220258505 CN202731770U (en) | 2012-06-01 | 2012-06-01 | Drilling tool joint with stress reduction groove arranged in outer threads |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220258505 CN202731770U (en) | 2012-06-01 | 2012-06-01 | Drilling tool joint with stress reduction groove arranged in outer threads |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202731770U true CN202731770U (en) | 2013-02-13 |
Family
ID=47657482
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220258505 Expired - Fee Related CN202731770U (en) | 2012-06-01 | 2012-06-01 | Drilling tool joint with stress reduction groove arranged in outer threads |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202731770U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106437553A (en) * | 2016-11-25 | 2017-02-22 | 江苏曙光华阳钻具有限公司 | Double-shoulder outer-thread pipe joint with stress retarding structure |
| CN109804132A (en) * | 2016-10-13 | 2019-05-24 | 美国法朗姆能源公司 | Stress reduces helicitic texture |
-
2012
- 2012-06-01 CN CN 201220258505 patent/CN202731770U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109804132A (en) * | 2016-10-13 | 2019-05-24 | 美国法朗姆能源公司 | Stress reduces helicitic texture |
| CN109804132B (en) * | 2016-10-13 | 2020-08-11 | 美国法朗姆能源公司 | Stress reducing thread structure |
| CN106437553A (en) * | 2016-11-25 | 2017-02-22 | 江苏曙光华阳钻具有限公司 | Double-shoulder outer-thread pipe joint with stress retarding structure |
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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: 20130213 Termination date: 20210601 |