CN202689966U - High-reliability threaded connection structure of oil well pipe - Google Patents
High-reliability threaded connection structure of oil well pipe Download PDFInfo
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- CN202689966U CN202689966U CN 201220342908 CN201220342908U CN202689966U CN 202689966 U CN202689966 U CN 202689966U CN 201220342908 CN201220342908 CN 201220342908 CN 201220342908 U CN201220342908 U CN 201220342908U CN 202689966 U CN202689966 U CN 202689966U
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- oil well
- well pipe
- male thread
- spot
- described oil
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Abstract
The utility model relates to a high-reliability threaded connection structure of an oil well pipe, comprising an oil well pipe factory end, an oil well pipe site end and a connection hoop, wherein male threads are arranged at the ends of the oil well pipe factory end and the oil well pipe site end; female threads which are matched with the male threads are arranged at two ends of the connection hoop; a ring-shaped groove is arranged in the middle of the inner wall of the connection hoop in the axial direction; the male threads at the oil well pipe factory end and the oil well pipe site end have opposite rotation directions but same thread pitch or have same rotation direction but different thread pitches; after the oil well pipe factory end is jointed with the oil well pipe site end through the connection hoop, the end face of the small end of the oil well pipe factory end is in direct tight contact with the end face of the small end of the oil well pipe site end; and a sealing element is arranged in the groove. According to the high-reliability threaded connection structure, the strength of the connection is improved without causing the male thread at the oil well pipe factory end to be unscrewed and the sealing performance of the connection is improved.
Description
Technical field
The utility model relates to oil pipe, sleeve pipe or the line pipe that use in the oil field, specifically a kind of high reliability screw connection structure of oil well pipe.
Background technology
Traditional oil pipe, sleeve pipe or line pipe (general designation oil well pipe) adopt the API standard thread to connect.As shown in Figure 1, box cupling 3 holds 1 by API(American Petroleum Institute (API) with the on-the-spot end 2 of oil well pipe with oil well pipe factory) standard thread is connected.The API standard thread is divided into round thread and buttress thread, and the male thread small end end face 4 of the on-the-spot end 2 of clear oil well pipe can not be run into the male thread small end end face 4 of oil well pipe factory end 1 and contact in their connection, and the API standard is controlled with the J value.The male thread small end end face 4 of oil well pipe factory end 1 with the reason that the male thread small end end face 4 of the on-the-spot end 2 of oil well pipe can not directly contact is: if contact, will produce frictional force in the contact position, this frictional force will make oil well pipe factory end 1 relative box cupling 3 box threads counter-rotate, loosening the withdrawing from of male thread rotation with the original oil well pipe factory end 1 of in plant produced, tightening, make the inefficacy that is threaded of oil well pipe, cause the crushing accident that well is ruined.The comprehensive comparison that the API standard thread connects is poor, is only applicable to general hydraulic seal occasion.
In order to improve the comprehensive switching performance of oil well pipe, such as sealing performance, bonding strength, torque resistant performance and bending resistance etc., developed a kind of special thread connected mode.As shown in Figure 2, the on-the-spot end 2 of box cupling 3 and oil well pipe and oil well pipe factory end 1 are connected by special thread, and male thread small end end face 4 and the oil well pipe factory that a torque resistant step separates the on-the-spot end 2 of oil well pipe is set in the centre of box cupling 3 holds 1 male thread small end end face 4.Special thread connects and can be used for high hermetic seal occasion, but owing to adopt the centre of special thread and box cupling 3 to also have an outstanding torque resistant step, processing technology is complicated, and processing cost is high.
The utility model content
The utility model provides a kind of high reliability screw connection structure of oil well pipe for the problems referred to above, and this syndeton connects reliable, and good airproof performance.
According to the first technical scheme of the present utility model: a kind of high reliability screw connection structure of oil well pipe, comprise oil well pipe factory end, the on-the-spot end of oil well pipe and box cupling, the end of described oil well pipe factory's end and the on-the-spot end of described oil well pipe is processed with male thread, the two ends of described box cupling are processed with the box thread that matches with described male thread, the axial middle part of described box cupling inwall is provided with annular groove, the male thread of described oil well pipe factory end is identical with the on-the-spot male thread rotation direction of holding of described oil well pipe but pitch is not identical, after described oil well pipe factory end closes by described box cupling and described oil well pipe field terminating, the small end end face of described oil well pipe factory end and the on-the-spot direct close contact of small end end face of holding of described oil well pipe are equipped with seal in the described groove.
The pitch of the male thread of described oil well pipe factory end is less than the pitch of the male thread of the on-the-spot end of described oil well pipe.
The material of described seal is soft sealing material.
According to the second technical scheme of the present utility model: a kind of high reliability screw connection structure of oil well pipe, comprise oil well pipe factory end, the on-the-spot end of oil well pipe and box cupling, the end of described oil well pipe factory's end and the on-the-spot end of described oil well pipe is processed with male thread, the two ends of described box cupling are processed with the box thread that matches with described male thread, the axial middle part of described box cupling inwall is provided with annular groove, the male thread rotation direction of the male thread of described oil well pipe factory end and the on-the-spot end of described oil well pipe on the contrary but pitch is identical, after described oil well pipe factory end closes by described box cupling and described oil well pipe field terminating, the small end end face of described oil well pipe factory end and the on-the-spot direct close contact of small end end face of holding of described oil well pipe are equipped with seal in the described groove.
The male thread of described oil well pipe factory end is left hand thread, and the male thread of the on-the-spot end of described oil well pipe is right-handed thread.
The material of described seal is soft sealing material.
Technique effect of the present utility model is: the utility model is provided with groove at the middle part of box cupling, the male thread rotation direction of the male thread of oil well pipe factory end and the on-the-spot end of oil well pipe is identical but pitch is not identical or rotation direction on the contrary but pitch is identical, so that the direct close contact of the small end end face of the small end end face of oil well pipe factory end and the on-the-spot end of oil well pipe, the male thread that has improved the intensity of connection and can not cause oil well pipe factory to be held moves back button; Seal is installed in the groove, has improved the sealing performance that connects.
Description of drawings
Fig. 1 is the structural representation that traditional API standard thread connects.
Fig. 2 is the structural representation that existing special thread connects.
Fig. 3 is structural representation of the present utility model.
The specific embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present utility model is further described.
Among Fig. 1～Fig. 3, comprise oil well pipe factory end 1, the on-the-spot end 2 of oil well pipe, box cupling 3, male thread small end end face 4, groove 5, seal 6 etc.
As shown in Figure 3, the utility model is a kind of high reliability screw connection structure of oil well pipe, comprise oil well pipe factory end 1, the on-the-spot end 2 of oil well pipe and box cupling 3, the end of oil well pipe factory end 1 and the on-the-spot end 2 of oil well pipe is processed with male thread, and the two ends of box cupling 3 are processed with the box thread that matches with male thread.
The utility model has two kinds of embodiments: the first embodiment is to be provided with annular groove 5 at the axial middle part of box cupling 3 inwalls, the male thread rotation direction of the male thread of oil well pipe factory end 1 and the on-the-spot end 2 of oil well pipe is identical but pitch is not identical, and preferred embodiment is that the pitch of male thread of oil well pipe factory end 1 is less than the on-the-spot pitch of holding 2 male thread of oil well pipe.After oil well pipe factory end 1 engages by the on-the-spot end 2 of box cupling 3 and oil well pipe, the small end end face 4 of oil well pipe factory end 1 and the small end end face 4 direct close contacts of the on-the-spot end 2 of oil well pipe, seal 6 is installed in the groove 5, and the material of seal 6 is preferably the soft sealing material polytetrafluoroethylene (PTFE).
The second embodiment is to be provided with annular groove 5 at the axial middle part of box cupling 3 inwalls, the male thread rotation direction of the male thread of oil well pipe factory end 1 and the on-the-spot end 2 of oil well pipe on the contrary but pitch is identical, preferred embodiment is that the male thread of oil well pipe factory end 1 is left hand thread, and the male thread of the on-the-spot end 2 of oil well pipe is right-handed thread.After oil well pipe factory end 1 engages by the on-the-spot end 2 of box cupling 3 and oil well pipe, the small end end face 4 of oil well pipe factory end 1 and the small end end face 4 direct close contacts of the on-the-spot end 2 of oil well pipe, seal 6 is installed in the groove 5, and the material of seal 6 is preferably soft sealing material, for example polytetrafluoroethylene (PTFE).
The utility model is provided with groove 5 at the middle part of box cupling 3, the male thread rotation direction of the male thread of oil well pipe factory end 1 and the on-the-spot end 2 of oil well pipe is identical but pitch is not identical or rotation direction on the contrary but pitch is identical, so that the direct close contact of the small end end face 4 of the small end end face 4 of oil well pipe factory end 1 and the on-the-spot end 2 of oil well pipe, improved the intensity that connects and can not cause oil well pipe factory to hold 1 male thread to move back button; Seal 6 is installed in the groove 5, has improved the sealing performance that connects.Do not have outstanding torque resistant step in the middle of the box cupling 3 of the present utility model, processing technology is simple, and processing cost is low.
Claims (6)
1. the high reliability screw connection structure of an oil well pipe, comprise oil well pipe factory end (1), the on-the-spot end of oil well pipe (2) and box cupling (3), the end of the on-the-spot end of described oil well pipe factory's end (1) and described oil well pipe (2) is processed with male thread, the two ends of described box cupling (3) are processed with the box thread that matches with described male thread, it is characterized in that: the axial middle part of described box cupling (3) inwall is provided with annular groove (5), the male thread of described oil well pipe factory end (1) and described oil well pipe be on-the-spot holds the male thread rotation direction of (2) identical but pitch is not identical, after described oil well pipe factory's end (1) holds (2) to engage by described box cupling (3) and described oil well pipe are on-the-spot, the small end end face (4) of described oil well pipe factory's end (1) and the direct close contact of the small end end face (4) of the on-the-spot end of described oil well pipe (2) are equipped with seal (6) in the described groove (5).
2. according to the high reliability screw connection structure of oil well pipe claimed in claim 1, it is characterized in that: the pitch of the male thread of described oil well pipe factory's end (1) is less than the pitch of the male thread of the on-the-spot end of described oil well pipe (2).
3. according to the high reliability screw connection structure of claim 1 or 2 described oil well pipes, it is characterized in that: the material of described seal (6) is soft sealing material.
4. the high reliability screw connection structure of an oil well pipe, comprise oil well pipe factory end (1), the on-the-spot end of oil well pipe (2) and box cupling (3), the end of the on-the-spot end of described oil well pipe factory's end (1) and described oil well pipe (2) is processed with male thread, the two ends of described box cupling (3) are processed with the box thread that matches with described male thread, it is characterized in that: the axial middle part of described box cupling (3) inwall is provided with annular groove (5), the male thread rotation direction of the male thread of described oil well pipe factory end (1) and the on-the-spot end of described oil well pipe (2) on the contrary but pitch is identical, after described oil well pipe factory's end (1) holds (2) to engage by described box cupling (3) and described oil well pipe are on-the-spot, the small end end face (4) of described oil well pipe factory's end (1) and the direct close contact of the small end end face (4) of the on-the-spot end of described oil well pipe (2) are equipped with seal (6) in the described groove (5).
5. according to the high reliability screw connection structure of oil well pipe claimed in claim 4, it is characterized in that: the male thread of described oil well pipe factory's end (1) is left hand thread, and the male thread of the on-the-spot end of described oil well pipe (2) is right-handed thread.
6. according to the high reliability screw connection structure of claim 4 or 5 described oil well pipes, it is characterized in that: the material of described seal (6) is soft sealing material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220342908 CN202689966U (en) | 2012-07-13 | 2012-07-13 | High-reliability threaded connection structure of oil well pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220342908 CN202689966U (en) | 2012-07-13 | 2012-07-13 | High-reliability threaded connection structure of oil well pipe |
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| Publication Number | Publication Date |
|---|---|
| CN202689966U true CN202689966U (en) | 2013-01-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220342908 Expired - Lifetime CN202689966U (en) | 2012-07-13 | 2012-07-13 | High-reliability threaded connection structure of oil well pipe |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104563905A (en) * | 2015-01-14 | 2015-04-29 | 江苏曙光石油钻采设备有限公司 | Deepwater petroleum drilling casing pipe joint rotation preventing structure |
| CN106287044A (en) * | 2016-08-16 | 2017-01-04 | 陆金福 | There is the screw connection structure of the band coating steel pipe of corrosion proof function |
| CN107035322A (en) * | 2017-06-09 | 2017-08-11 | 贵州高峰石油机械股份有限公司 | A kind of method and structure of positive and negative high antitorque anti-back button |
| CN111120747A (en) * | 2020-01-19 | 2020-05-08 | 成都市卓新实业有限公司 | Anti-turbulent pipeline |
-
2012
- 2012-07-13 CN CN 201220342908 patent/CN202689966U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104563905A (en) * | 2015-01-14 | 2015-04-29 | 江苏曙光石油钻采设备有限公司 | Deepwater petroleum drilling casing pipe joint rotation preventing structure |
| CN106287044A (en) * | 2016-08-16 | 2017-01-04 | 陆金福 | There is the screw connection structure of the band coating steel pipe of corrosion proof function |
| CN107035322A (en) * | 2017-06-09 | 2017-08-11 | 贵州高峰石油机械股份有限公司 | A kind of method and structure of positive and negative high antitorque anti-back button |
| CN111120747A (en) * | 2020-01-19 | 2020-05-08 | 成都市卓新实业有限公司 | Anti-turbulent pipeline |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130123 |
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| CX01 | Expiry of patent term |