CN108590542B - Threaded connection structure - Google Patents
Threaded connection structure Download PDFInfo
- Publication number
- CN108590542B CN108590542B CN201810642588.9A CN201810642588A CN108590542B CN 108590542 B CN108590542 B CN 108590542B CN 201810642588 A CN201810642588 A CN 201810642588A CN 108590542 B CN108590542 B CN 108590542B
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- China
- Prior art keywords
- thread
- joint
- female joint
- male
- root
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Links
- 238000000034 method Methods 0.000 claims abstract description 7
- 230000007704 transition Effects 0.000 claims description 20
- 238000005299 abrasion Methods 0.000 abstract description 6
- 208000034656 Contusions Diseases 0.000 abstract description 5
- 208000034526 bruise Diseases 0.000 abstract description 4
- 238000005553 drilling Methods 0.000 description 11
- 208000035874 Excoriation Diseases 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000004026 adhesive bonding Methods 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 239000003209 petroleum derivative Substances 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/042—Threaded
- E21B17/0426—Threaded with a threaded cylindrical portion, e.g. for percussion rods
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Connection Of Plates (AREA)
- Mutual Connection Of Rods And Tubes (AREA)
Abstract
The invention discloses a threaded connection structure. The device consists of a male joint thread section and a female joint thread section; the male joint thread section is provided with a male joint thread crest and a male joint thread root which are sequentially and alternately arranged in succession along a male joint thread generatrix, a male joint bearing surface is arranged between the male joint thread crest and the last male joint thread root, and a male joint guide surface is arranged between the male joint thread crest and the next male joint thread root; the female joint thread section is provided with a female joint thread crest and a female joint thread root which are sequentially and alternately arranged in succession along a female joint thread busbar, a female joint bearing surface is arranged between the female joint thread crest and the last female joint thread root, and a female joint guide surface is arranged between the female joint thread crest and the next female joint thread root; the crests of the male and female joint threads are elliptical crests, and the roots of the male and female joint threads are elliptical roots. The invention improves the tensile strength and the torsional strength of the joint thread, reduces the concentration of the thread root stress, improves the fatigue life of the joint thread, and greatly reduces the probability of abrasion and bruise of the thread root in the process of screwing-off and threading the shoe.
Description
Technical Field
The invention relates to a drill string tool used in the petroleum and natural gas drilling process, in particular to a threaded connection structure.
Background
The single-shoulder and double-shoulder thread teeth of the existing petroleum drill rod are mostly the same as API standard thread design, the thread crest plane, the guide surface and the bearing surface are respectively in arc transition connection, and the thread root is in arc transition connection between the guide surface and the bearing surface. In the process of screwing up and off the thread tooth type structure, the transitional arcs on two sides of the plane of the thread crest often generate bruise or abrasion, and the failure accident of the thread gluing is caused seriously; on the other hand, in the rotary drilling process of the drill string, the thread root is a dangerous section with the most concentrated stress, and is easy to initiate fatigue cracks, so that the fatigue life of the drill string is seriously influenced.
The petroleum and natural gas drilling industry breaks through the existing drilling limit, and the drilling quantity and depth records of ultra-deep wells and large-displacement extended wells are continuously refreshed. However, the problems of severe drilling working condition environment, long drilling operation period, great increase of drilling cost and the like are also faced. In order to ensure the safety of drilling operation, the high-strength drill rod technology and the double-shoulder high-torsion-resistance thread technology are popularized and applied on a large scale, and nowadays, the drill rod technology and the double-shoulder high-torsion-resistance thread technology become industrial research hot spots for further improving the drilling operation efficiency, reducing the drilling operation cost, avoiding thread gluing failure caused by early abrasion of threads, improving the torsional strength of drill rod threaded connection, prolonging the fatigue life and the like.
Disclosure of Invention
The invention aims to provide a threaded connection structure, which mainly solves the technical problems in the prior art, and compared with the conventional joint thread profile, the threaded connection structure has the advantages that the tensile strength and the torsional strength of the joint thread are improved, the concentration of the thread root stress is reduced, the fatigue life of the joint thread is prolonged, meanwhile, the probability of abrasion and bruising of the thread crest is greatly reduced in the process of threading and threading shoes on a shackle, and the threaded connection structure has the exchange characteristic with the conventional joint thread.
In order to solve the technical problems, the invention adopts the following technical scheme:
a threaded connection structure is composed of a male joint threaded section and a female joint threaded section which are connected in a matching mode;
the male joint thread section is provided with a male joint thread crest and a male joint thread root which are sequentially and alternately arranged in succession along a male joint thread generatrix, a male joint bearing surface is arranged between the male joint thread crest and the last male joint thread root, and a male joint guide surface is arranged between the male joint thread crest and the next male joint thread root;
correspondingly, the female joint thread section is provided with a female joint thread crest and a female joint thread root which are sequentially and alternately arranged in succession along a female joint thread busbar, a female joint bearing surface is arranged between the female joint thread crest and the last female joint thread root, and a female joint guide surface is arranged between the female joint thread crest and the next female joint thread root;
the method is characterized in that:
the thread crest of the male joint is an oval crest, and the thread root of the male joint is an oval root; correspondingly, the crests of the female joint thread are elliptical crests and the roots of the female joint thread are elliptical roots.
The threaded connection structure, its characterized in that: the thread crests of the male connector and the bearing surface of the male connector are tangential or smooth; the thread crests of the female joint and the bearing surface of the female joint are tangential or smooth transition.
The threaded connection structure, its characterized in that: a male joint transition arc is arranged between the male joint thread root and the male joint guide surface; and a female joint transition circular arc is arranged between the female joint thread root and the female joint guide surface.
The threaded connection structure, its characterized in that: the radius of the transition arc of the male connector is 0.5 mm-8 mm; the radius of the transition circular arc of the female joint is 0.5 mm-8 mm.
The threaded connection structure, its characterized in that:
the length of the elliptic long axis of the thread crest of the male joint is 1.5 mm-5 mm, and the length of the elliptic short axis is smaller than that of the elliptic long axis; the included angle a between the elliptic long axis of the thread crest of the male joint and the straight line perpendicular to the central line of the joint is 50-75 degrees;
the length of the elliptic long axis of the thread crest of the female joint is 1.5 mm-5 mm, and the length of the elliptic short axis is smaller than the elliptic long axis; the included angle a between the elliptic long axis of the thread crest of the female joint and the straight line perpendicular to the central line of the joint is 50-75 degrees;
the length of the elliptic long axis of the thread root of the male joint is 0.8-3.5 mm, and the length of the elliptic short axis is smaller than the elliptic long axis; the included angle b between the elliptic long axis of the thread root of the male joint and the straight line perpendicular to the central line of the joint is 60-90 degrees;
the length of the elliptic long axis of the thread root of the female joint is 0.8-3.5 mm, and the length of the elliptic short axis is smaller than the elliptic long axis; the included angle b between the elliptic long axis of the thread root of the female joint and the straight line perpendicular to the central line of the joint is 60-90 degrees.
By virtue of the structure, the invention has the following advantages:
in the invention, the thread crest of the male joint is an oval crest and the thread root of the male joint is an oval root; correspondingly, the crests of the female joint thread are elliptical crests and the roots of the female joint thread are elliptical roots. After the elliptical thread crests are adopted, when the pin joint threads and the box joint threads are buckled and screwed, the crests are more smooth in transition, and thread abrasion or bruise is not easy to occur. After the elliptical thread root is adopted, under the condition that the contact area of the bearing surface is not reduced, the transition of the thread root of the bearing surface is more gentle, and meanwhile, the dangerous sectional area of the thread root which is the most concentrated stress is increased, so that the tensile strength, the torsional strength and the fatigue resistance of the joint thread are improved.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic view of the configuration of the thread profile of the pin according to the present invention.
1-a threaded section of a pin; 11-pin thread crests; 12-a male connector bearing surface; 13-pin thread root; 14-a male joint transition arc; 15-pin guide surface; 16-pin thread bus bar; 17-joint centerline; 111-elliptical long axis; 112-ellipse minor axis; 131-ellipse long axis; 132—an elliptical minor axis; 2-a box thread section; 21-box thread crests; 22-a female connector bearing surface; 23-box thread root; 24-a female joint transitional arc; 25-a female connector guide surface; 26-female connector threaded bus.
Detailed Description
The invention will be described in detail below with reference to the drawings and examples.
As shown in fig. 1 and 2, the invention discloses a threaded connection structure, which consists of a pin thread section 1 and a box thread section 2 which are connected in a matching way.
The pin thread segment 1 has pin thread crests 11 and pin thread roots 13 arranged alternately and successively in sequence along a pin thread generatrix 16, a pin load-bearing surface 12 being provided between the pin thread crest 11 and the last pin thread root 13, and a pin guide surface 15 being provided between the pin thread crest 11 and the next pin thread root 13.
Correspondingly, the box thread section 2 has a box thread crest 21 and a box thread root 23 arranged alternately and successively in sequence along a box thread busbar 26, a box load-bearing surface 22 being provided between the box thread crest 21 and the previous box thread root 23, and a box guide surface 25 being provided between the box thread crest 21 and the next box thread root 23.
The invention is characterized in that: the thread crest 11 of the male joint is an oval crest, and the thread root of the male joint is an oval root; correspondingly, the crests 21 of the female joint thread are elliptical crests and the roots of the female joint thread are elliptical roots.
In the invention, the thread crests 11 of the male connector and the bearing surface 12 of the male connector and the guide surface 15 of the male connector are tangent or smoothly transited; the thread crests 21 of the female joint are tangent or smoothly transited with the bearing surfaces 22 and the guide surfaces 25 of the female joint.
In the invention, a male joint transition circular arc 14 is arranged between the male joint thread root 13 and the male joint guide surface 15; a box transition arc 24 is provided between the box thread root 23 and the box guide surface 25.
In the invention, the radius of the male joint transition arc 14 is 0.5 mm-8 mm; the radius of the female joint transition arc 24 is 0.5 mm-8 mm.
In the invention, the length of the elliptic long axis 111 of the thread crest 11 of the male joint is 1.5 mm-5 mm, and the length of the elliptic short axis 112 is smaller than that of the elliptic long axis 111; the included angle a between the elliptic long axis 111 of the thread crest 11 of the male joint and the straight line perpendicular to the central line 17 of the joint is 50-75 degrees; the length of the elliptic long axis of the thread crests 21 of the female joint is 1.5-5 mm, and the length of the elliptic short axis is smaller than that of the elliptic long axis; the included angle a between the elliptic long axis of the thread crest 21 of the female joint and the straight line perpendicular to the joint central line 17 is 50-75 degrees; the length of the elliptic long axis 131 of the pin thread root 13 is 0.8 mm-3.5 mm, and the length of the elliptic short axis 132 is smaller than that of the elliptic long axis 131; the included angle b between the elliptic long axis 131 of the pin thread root 13 and the straight line perpendicular to the joint center line 17 is 60-90 degrees; the length of the elliptic long axis of the thread root 23 of the female joint is 0.8 mm-3.5 mm, and the length of the elliptic short axis is smaller than that of the elliptic long axis; the included angle b between the elliptic long axis of the thread root of the female joint and the straight line perpendicular to the joint central line 17 is 60-90 degrees.
In the invention, the thread crest of the male joint is an oval crest and the thread root of the male joint is an oval root; correspondingly, the crests of the female joint thread are elliptical crests and the roots of the female joint thread are elliptical roots. After the elliptical thread crests are adopted, when the pin joint threads and the box joint threads are buckled and screwed, the crests are more smooth in transition, and thread abrasion or bruise is not easy to occur. After the elliptical thread root is adopted, under the condition that the contact area of the bearing surface is not reduced, the transition of the thread root of the bearing surface is more gentle, and meanwhile, the dangerous sectional area of the thread root which is the most concentrated stress is increased, so that the tensile strength, the torsional strength and the fatigue resistance of the joint thread are improved.
The above description and application of the present invention is illustrative and is not intended to limit the scope of the present invention in the above-described embodiments; other variations and modifications of the embodiments disclosed herein may be made without departing from the scope and spirit of the invention.
Claims (2)
1. A threaded connection structure is composed of a male joint threaded section (1) and a female joint threaded section (2) which are connected in a matching way;
the pin thread section (1) is provided with a pin thread crest (11) and a pin thread root (13) which are sequentially and alternately arranged in succession along a pin thread generatrix (16), a pin bearing surface (12) is arranged between the pin thread crest (11) and the last pin thread root (13), and a pin guide surface (15) is arranged between the pin thread crest (11) and the next pin thread root (13);
correspondingly, the female joint thread section (2) is provided with a female joint thread crest (21) and a female joint thread root (23) which are sequentially and alternately arranged in succession along a female joint thread busbar (26), a female joint bearing surface (22) is arranged between the female joint thread crest (21) and the last female joint thread root (23), and a female joint guide surface (25) is arranged between the female joint thread crest (21) and the next female joint thread root (23);
the method is characterized in that:
the thread crest (11) of the male joint is an oval crest, and the thread root of the male joint is an oval root; correspondingly, the crests (21) of the female joint thread are elliptical crests and the roots of the female joint thread are elliptical roots;
the length of an elliptic long axis (111) of the thread crest (11) of the male joint is 1.5-5 mm, and the length of an elliptic short axis (112) is smaller than that of the elliptic long axis (111); the included angle a between the elliptic long axis (111) of the thread crest (11) of the male joint and the straight line perpendicular to the joint central line (17) is 50-75 degrees;
the length of the elliptic long axis of the thread crest (21) of the female joint is 1.5-5 mm, and the length of the elliptic short axis is smaller than that of the elliptic long axis; the included angle a between the elliptic long axis of the thread crest (21) of the female joint and the straight line perpendicular to the joint central line (17) is 50-75 degrees;
the length of an elliptic long axis (131) of the pin thread root (13) is 0.8-3.5 mm, and the length of an elliptic short axis (132) is smaller than that of the elliptic long axis (131); the included angle b between the elliptic long axis (131) of the pin thread root (13) and the straight line perpendicular to the joint central line (17) is 60-90 degrees;
the length of the elliptic long axis of the thread root (23) of the female joint is 0.8-3.5 mm, and the length of the elliptic short axis is smaller than the elliptic long axis; the included angle b between the elliptic long axis of the thread root of the female joint and the straight line perpendicular to the joint central line (17) is 60-90 degrees;
the thread crests (11) of the male connector are tangential or smooth with the bearing surface (12) of the male connector and the guide surface (15) of the male connector; the thread crests (21) of the female joint are tangential or smooth with the bearing surface (22) and the guide surface (25) of the female joint;
a male joint transition circular arc (14) is arranged between the male joint thread root (13) and the male joint guide surface (15); a female joint transition circular arc (24) is arranged between the female joint thread root (23) and the female joint guide surface (25).
2. The threaded connection as defined in claim 1, wherein: the radius of the male joint transition arc (14) is 0.5 mm-8 mm; the radius of the transition circular arc (24) of the female joint is 0.5 mm-8 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810642588.9A CN108590542B (en) | 2018-06-21 | 2018-06-21 | Threaded connection structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810642588.9A CN108590542B (en) | 2018-06-21 | 2018-06-21 | Threaded connection structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108590542A CN108590542A (en) | 2018-09-28 |
| CN108590542B true CN108590542B (en) | 2023-10-24 |
Family
ID=63628508
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810642588.9A Active CN108590542B (en) | 2018-06-21 | 2018-06-21 | Threaded connection structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108590542B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2610060Y (en) * | 2003-04-11 | 2004-04-07 | 西安纳特石油技术有限责任公司 | Petroleum drilling tool screwed nipple |
| CN103282708A (en) * | 2010-12-28 | 2013-09-04 | 瓦卢莱克曼内斯曼油气法国公司 | Threaded connection for drilling and working hydrocarbon wells |
| CN103328035A (en) * | 2011-01-18 | 2013-09-25 | 株式会社托普 | Female-side connector |
| CN203230350U (en) * | 2013-03-06 | 2013-10-09 | 中国石油天然气股份有限公司 | Thread form structure of straight thread |
| CN106089116A (en) * | 2016-08-29 | 2016-11-09 | 贵州捷盛钻具股份有限公司 | Impact type compound thread connects drill rod |
| CN208364063U (en) * | 2018-06-21 | 2019-01-11 | 上海海隆石油管材研究所 | A kind of screw connection structure |
| WO2023284899A1 (en) * | 2021-07-14 | 2023-01-19 | 中船重工海为郑州高科技有限公司 | Design method for arc threaded connection pair |
-
2018
- 2018-06-21 CN CN201810642588.9A patent/CN108590542B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2610060Y (en) * | 2003-04-11 | 2004-04-07 | 西安纳特石油技术有限责任公司 | Petroleum drilling tool screwed nipple |
| CN103282708A (en) * | 2010-12-28 | 2013-09-04 | 瓦卢莱克曼内斯曼油气法国公司 | Threaded connection for drilling and working hydrocarbon wells |
| CN103328035A (en) * | 2011-01-18 | 2013-09-25 | 株式会社托普 | Female-side connector |
| CN203230350U (en) * | 2013-03-06 | 2013-10-09 | 中国石油天然气股份有限公司 | Thread form structure of straight thread |
| CN106089116A (en) * | 2016-08-29 | 2016-11-09 | 贵州捷盛钻具股份有限公司 | Impact type compound thread connects drill rod |
| CN208364063U (en) * | 2018-06-21 | 2019-01-11 | 上海海隆石油管材研究所 | A kind of screw connection structure |
| WO2023284899A1 (en) * | 2021-07-14 | 2023-01-19 | 中船重工海为郑州高科技有限公司 | Design method for arc threaded connection pair |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108590542A (en) | 2018-09-28 |
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