CN2413015Y - Coupling for round thread connecting oil field casing and tubing - Google Patents
Coupling for round thread connecting oil field casing and tubing Download PDFInfo
- Publication number
- CN2413015Y CN2413015Y CN 99256835 CN99256835U CN2413015Y CN 2413015 Y CN2413015 Y CN 2413015Y CN 99256835 CN99256835 CN 99256835 CN 99256835 U CN99256835 U CN 99256835U CN 2413015 Y CN2413015 Y CN 2413015Y
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- thread
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Abstract
The utility model relates to a coupling for round threads of oil pipes connecting with casing tubes in oilfields, wherein the pitch circle diameter E of a starting tooth with complete tooth shape is E, the starting tooth with complete tooth shape is connected with a starting buckle with incomplete tooth shape; the pitch circle diameter of a starting tooth with complete tooth shaft of a standard circle is E0+delta; the delta is from 0.1 to 1.0MM. The starting tooth with complete tooth shaft is connected with the normal round threads with complete tooth shape by introducing threads. The length of the introducing thread Y is 0.01P to 2/3 (A+1) P. The taper T of the diameter of the introducing thread is the taper T0+delta/Y of the diameter of the thread of the standard circle. The tooth shaft and the tooth distance of the introducing thread is the same as those of the thread of the standard circle. When the coupling is connected with threads of a steel tube in radial direction in an interference mode, the edges of the starting buckle with incomplete tooth shape and the starting tooth of the complete tooth shape enter the interference part of the threads of the steel tube, and do not generate serious scrape. The interference part the threads of the steel tube is introduced into the threads and is compressed uniformly. Consequently, the utility model eliminates the occurrence of the phenomenon that the buckle is glued when the pipe is put in the oilfields.
Description
The utility model relates to a kind of sleeve in oil field, the oil pipe standard round is threaded and uses box cupling.
The angle of thread of the round thread that employing API (American Petroleum Institute) standard is made is 60 °, and half-angle is that 30 ° of ridges are 3.175 millimeters apart from P, and minor diameter tubing is 2.54 millimeters.Screw thread is for having the gas thread of 1: 16162.5 millimeter (rice) diameter taper.Because screw thread is easy to process, quality is easy to guarantee, thereby is widely used in the connection of sleeve in oil field, oil pipe, the connection of connection employing box cupling.The tight regulation of machine tight apart from A (with the tooth number is unit, and sleeve pipe is generally the 3-4 tooth, and oil pipe is generally 2 teeth) again after steel pipe is connected with box cupling is hand-tight during connection forms steel pipe and is connected with the screw thread radial interference fit of box cupling.The sleeve in oil field that existing employing API standard is made, the two ends that the oil pipe round thread connects the box cupling of usefulness have the stomidium of internal diameter greater than outer diameter of steel pipes respectively, and one section 25 ° taper hole is respectively arranged behind two stomidiums.The taper hole district has formed the infull starting buckle zone of thread form of box cupling screw thread, and starting buckle is connected by the complete normal round thread of complete initial tooth of round thread of thread form and thread form.The pitch diameter of the initial tooth of round thread that thread form is complete is E
0, box cupling diameter of thread tapering is T
0The oil field start edge that down steel pipe carries out the complete initial tooth of the box cupling form of thread is incomplete in the tight process of machine starting buckle and thread form after hand-tight during pipe carries out scraping to the gas thread interference part (crest, tooth side and the root of the tooth interference part that comprise screw thread) that constantly enters makes the screw thread damage, and the thread gluing phenomenon takes place when serious.Owing to this reason, the thread gluing phenomenon happens occasionally in the pipe process under the oil field.In case the generation thread gluing has not only increased link closely resistance and moment of torsion, and make link closely not in place.So oil field down pipe takes place all will change steel pipe after the thread gluing, generally at least 2 reach the 7-8 root at most.This not only makes, and the pipe operation cycle prolongs under the oil field, but also has caused the waste of a large amount of human and material resources that the pipe expense is increased greatly.
The purpose of this utility model is to adopt standard round to be threaded to existing sleeve in oil field, oil pipe to be improved with box cupling, provides a kind of sleeve in oil field, oil pipe round thread to connect with not thread gluing box cupling.
The purpose of this utility model realizes by following manner.
The two ends that make according to the API standard have the stomidium of internal diameter greater than outer diameter of steel pipes respectively, one section 25 ° of taper hole district is arranged respectively behind two stomidiums, the taper hole district has formed the infull starting buckle zone of thread form of box cupling round thread, and round thread thread form, tooth are the complete initial tooth pitch diameter E of the standard round form of thread apart from, sleeve in oil field that diameter of thread tapering is identical with the standard round screw thread, the connection of oil pipe round thread with the pitch diameter E of the complete initial tooth of the thread form that is connected with the incomplete starting buckle of thread form of box cupling
0+ △
0, △ is 0.1～1.0 millimeter.The initial tooth that thread form is complete is connected by the complete normal round thread of introducing screw thread and thread form, and introducing reach Y is 0.01P～2/3P (A+1) P.Introducing diameter of thread tapering T is standard round diameter of thread tapering T
0+ △/Y, thread form, the tooth distance of introducing screw thread are identical with thread form, the tooth distance of standard round screw thread.
The start edge that the not thread gluing box cupling that utilizes the utility model to provide carries out the complete initial tooth of starting buckle that the thread form of box cupling is incomplete in the tight process of pipe junctor under the oil field and the thread form that is connected with starting buckle does not produce serious scraping to the steel pipe screw thread interference part that enters, thereby has eliminated the generation of thread gluing phenomenon.The interference of the steel pipe screw thread that enters part evenly compressed in introducing screw thread, thus guaranteed pipe under the oil field carry out the quality that is connected with steel pipe smoothly.Not thread gluing box cupling helicitic texture also can be used for overall structure oil pipe female end, and the adapter of carrying out oil pipe connects.
Accompanying drawing is embodiment of the present utility model, further specifies the utility model below in conjunction with embodiment.
Fig. 1 is that sleeve in oil field, oil pipe round thread connect the structural representation with not thread gluing box cupling.
Fig. 2 is the B portion partial enlarged drawing of Fig. 1.
Fig. 3 is the structural representation that not thread gluing box cupling is connected with steel pipe.
Fig. 4 is the C portion partial enlarged drawing of Fig. 3.
As shown in Figure 1 and Figure 2, the two ends that sleeve in oil field, oil pipe round thread connect with not thread gluing box cupling (1) have stomidium (2), (7) of internal diameter greater than outer diameter of steel pipes respectively, one section 25 ° taper holes (4), (6) are arranged respectively behind two stomidiums, and the taper hole district forms the infull starting buckle zone of thread form of box cupling screw thread.The pitch diameter E of the initial tooth of round thread (3) that the thread form that is connected with the incomplete starting buckle of thread form is complete is the complete initial tooth pitch diameter E of the standard round form of thread
0+ △, △ are 0.1～1.0mm.The initial tooth of the round thread that thread form is complete is connected by the complete normal round thread line of introducing screw thread (5) and thread form, and introducing reach Y is 0.01P～2/3 (A+1) P, and introducing diameter of thread tapering T is standard round diameter of thread tapering T
0+ △/Y, thread form, the tooth distance of introducing screw thread are identical with thread form, the tooth distance of standard round screw thread.
The oil field down during pipe, steel pipe (10) and screw thread radial interference fit be connected the hand-tight back (shown in Fig. 3 right-hand member) that is connected of box cupling (9) on the steel pipe (8), and the tight regulation of machine is tight apart from the connection of A formation screw thread radial interference fit again.Promptly as Fig. 3 left end and shown in Figure 4, the starting buckle that the box cupling thread form is incomplete does not produce serious scraping with the complete initial tooth of round thread of the thread form that is connected with starting buckle to the steel pipe screw thread interference part that enters, the steel pipe screw thread that enters is introduced into screw thread and evenly compresses, thereby eliminated the thread gluing phenomenon in the tight process of machine, guaranteed carrying out smoothly and taking over quality of pipe under the oil field.1 plane is hand-tight plane among the figure.
Claims (1)
1, a kind of sleeve in oil field, oil pipe round thread connect with not thread gluing box cupling, two ends have the stomidium of internal diameter greater than outer diameter of steel pipes respectively, one section 25 ° of taper hole district is arranged respectively behind two stomidiums, the taper hole district has formed the infull starting buckle zone of thread form of box cupling round thread, round thread thread form, tooth are identical with the standard round screw thread apart from, diameter taper, it is characterized in that the pitch diameter E of the initial tooth that the thread form that is connected with the incomplete starting buckle of thread form is complete is the complete initial tooth pitch diameter E of the standard round form of thread
0+ △, △ are 0.1～1.0 millimeter, and the initial tooth that thread form is complete is connected by the complete normal round thread of introducing screw thread and thread form, and introducing reach Y is 0.01P～2/3 (A+1) P, and introducing diameter of thread tapering T is standard round diameter of thread tapering T
0+ △/Y, thread form, the tooth distance of introducing screw thread are identical with thread form, the tooth distance of standard round screw thread.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99256835 CN2413015Y (en) | 1999-12-17 | 1999-12-17 | Coupling for round thread connecting oil field casing and tubing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99256835 CN2413015Y (en) | 1999-12-17 | 1999-12-17 | Coupling for round thread connecting oil field casing and tubing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2413015Y true CN2413015Y (en) | 2001-01-03 |
Family
ID=34039874
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99256835 Expired - Fee Related CN2413015Y (en) | 1999-12-17 | 1999-12-17 | Coupling for round thread connecting oil field casing and tubing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2413015Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102678064A (en) * | 2011-11-09 | 2012-09-19 | 中国石油天然气集团公司 | Control method for improving anti-sticking performance and connection strength of round thread oil pipe and bushing |
| CN101021147B (en) * | 2006-02-15 | 2013-06-26 | 希德卡公司 | Sucker rod connection with improved fatigue resistance |
| CN112459727A (en) * | 2020-12-11 | 2021-03-09 | 江苏常宝钢管股份有限公司 | Anti-thread gluing tubing coupling device |
-
1999
- 1999-12-17 CN CN 99256835 patent/CN2413015Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101021147B (en) * | 2006-02-15 | 2013-06-26 | 希德卡公司 | Sucker rod connection with improved fatigue resistance |
| CN102678064A (en) * | 2011-11-09 | 2012-09-19 | 中国石油天然气集团公司 | Control method for improving anti-sticking performance and connection strength of round thread oil pipe and bushing |
| CN102678064B (en) * | 2011-11-09 | 2015-09-09 | 中国石油天然气集团公司 | Improve round thread oil pipe and the anti-stick control method of buckleing performance and bonding strength of sleeve pipe |
| CN112459727A (en) * | 2020-12-11 | 2021-03-09 | 江苏常宝钢管股份有限公司 | Anti-thread gluing tubing coupling device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |