CN200971757Y - High seal buttless thread double-pipe connection structure - Google Patents
High seal buttless thread double-pipe connection structure Download PDFInfo
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- CN200971757Y CN200971757Y CN 200620026316 CN200620026316U CN200971757Y CN 200971757 Y CN200971757 Y CN 200971757Y CN 200620026316 CN200620026316 CN 200620026316 CN 200620026316 U CN200620026316 U CN 200620026316U CN 200971757 Y CN200971757 Y CN 200971757Y
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- wedge shape
- torque shoulder
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Abstract
The utility model provides a highly sealing sawtooth type thread sleeve connecting structure which is threaded and screwed by a sleeve with outer threads possessing ends and a coupling with inner threads possessing ends. Both the inner threads of the sleeve and the inner threads of the coupling are provided with sawtooth type thread profile shaped conic threads with a self locking performance, and a D section and a C section of the inner and outer conic threads are both provided with a conic sealing face and a main sealing structure which is composed of wedge shouldering torques. The utility model has the advantages of double safety form combing a sawtooth type thread sealing and conic to conic sealing face may improve the anti slipping performance of thread joints as well as the anti leakage ability of the joints, thereby lifting the anti tension strength of the joints to a level higher than 90 percent of the anti tension strength of pipes. Furthermore, the thread sleeve has a good processing technique and good on/off performance and simultaneously avoids the phenomenon of thread gluing, thereby making the operations on wells more convenient.
Description
Technical field
The utility model relates to the be tightly connected high sealability sawtooth casing threads syndeton of structure, particularly a kind of petroleum casing pipe of OCTG.
Background technology
In the last thirty years, oil well, gas well drilling environment are harsh day by day; Oil gas well depth, bottom pressure and temperature increase day by day, along with the demand of oil industry rapid development and market competition, and especially gas extraction, also more and more higher to the technical requirements of OCTG.
At present, in general API tubing and casing standard series, employing be mostly short round thread, oval screw thread and buttress thread.8 tooth round thread sleeve structures are simple in the API standard, and its manufacturability, sealing are better, but because of its anti-slip poor performance, easily thread gluing, the geological condition complexity particularly the application facet of deep-well be subjected to bigger restriction.5 tooth BCSG in the API standard are because thread form and design feature, its anti-slip performance greatly improves, the anti-slip intensity of joint has reached the tensile strength of body substantially, overcome the shortcoming that round thread connects anti-slip intensity difference, but the poor sealing performance of nipple, manufacturability are also not as round thread.
More than two kinds of button-types and syndeton, in the problem that all exists aspect structural integrity that ensures tubing string and the sealing integrity separately.As the round thread tubing string: good airproof performance is in buttress thread, but its screw connection point can only bear 60%～80% the tensile load that is equivalent to body intensity; The bonding strength of buttress thread is better than the round thread tubing string, but the thread seal performance is lower, and seal-air pressure generally is no more than 28MP.Therefore, two kinds of tooth forms of this of API standard series and casing-pipe connection structure all are difficult to satisfy the demand of current oil gas well, thereby need a kind of new button-type and casing-pipe connection structure that can satisfy the oil field demand.
Summary of the invention
For addressing the above problem, the purpose of this utility model provides a kind of high sealability buttless thread casing-pipe connection structure that oil, the natural gas well have gas sealing ability that is used for.This structure has adopted saw-tooth thread thread form and the taper thread with self-locking property, and the design of internal and external threads D, C section has conical seal (contact) face and wedge shape torque shoulder.
For achieving the above object, the technical solution adopted in the utility model provides a kind of high sealability buttless thread casing-pipe connection structure, it has box cupling that externally threaded sleeve pipe and end have internal thread by an end and screws lemon and connect and form, wherein: the D section of the externally threaded C section of described sleeve pipe and the internal thread of box cupling all is set to have the taper thread of the saw-tooth thread thread form of self-locking property, and the D of described internal and external screw thread, C section are provided with the primary seal structure that conical seal (contact) face and wedge shape torque shoulder are formed.
Described saw-tooth thread with self-locking property, the approaching face angle of its profile of tooth is 57 °, and the bearing surface angle is 3 °, and thread angle is 60 °.
Described primary seal structure comprises: sealing taper surface in the D section of described coupling end is provided with is provided with wedge shape internal torque shoulder in the end of interior sealing taper surface; The C section of described cannula tip is provided with the external seal taper surface, is provided with torque shoulder outside the wedge shape in the end of external seal taper surface; Interior sealing taper surface and wedge shape internal torque shoulder contact with external seal taper surface and the outer torque shoulder of wedge shape.
It is 10 ° of angles that the angle of the wedge shape internal torque shoulder of described internal thread, the outer torque shoulder of external screw thread wedge shape and sleeve pipe cross section all is.
The cone angle of sealing taper surface and external screw thread external seal taper surface is 20 ° in the described internal thread.
The beneficial effects of the utility model are that the sealing of this saw-tooth thread adds and bores the double insurance form that bevel sealing surface is combined, and both can promote the antiskid holder performance of nipple, have improved the anti-leakage ability of joint again; Make the tensile strength of joint can reach more than 95% of body tensile strength; And the processing technology of threaded sleeve is good, go up the generation that the shackle performance is good, avoided the thread gluing phenomenon, makes aboveground more convenient operation.
The characteristics of this serrated teeth molded cannula screw connection structure:
1, its approaching face angle of zigzag flute profile is 57 °, and the bearing surface angle is 3 °; Its flute profile is different from normally used trapezoidal partially flute profile, good airproof performance.
2, at the bottom of this notched teeth, crest is little arc form, it had both kept round thread sleeve pipe manufacturability, sealing is better, the advantage that BCSG is anti-slip, intensity is big has overcome again that the anti-slip intensity of round thread sleeve pipe is low, the deficiency of BCSG sealing difference.
3, because 3 ° of angles of screw thread bearing surface thread form are designed, less than the angle of friction between the metal, so self-locking property is good.Nipple screw thread under the effect of tensile load mainly bears axial shear stress, and easy slippage inefficacy as the API round thread can not appear in joint;
4, the form of thread is little matched in clearance (fit clearance 0.03mm at the bottom of crest, the tooth) design, and the leakage paths of screw thread is longer in addition, combines with the primary seal position that seals nose C, comprehensively the anti-leakage ability of lifting sub.Gas sealing ability is better than general special snapping head.
5, by optimizing the parameter that cooperates of screw thread and the sealing surface magnitude of interference, when guaranteeing the nipple sealing performance, reduce the contact stress that cooperates as far as possible, prevented the generation of thread gluing phenomenon effectively, improved nipple on, unload performance.
6, owing to adopted less suitable matching allowance, form rational cooperation contact stress, improved anti-stress corrosion performance.
7, owing to adopted the thread form similar, make its processing technology be better than other form of thread to the API round thread.
Description of drawings
Fig. 1 is a structural representation of the present utility model;
Fig. 2 connects form of thread amplification profile for sleeve pipe of the present utility model and box cupling lemon;
Fig. 3 is a STRUCTURE DECOMPOSITION schematic diagram of the present utility model.
Among the figure:
A, sleeve pipe B, box cupling
C, pipe sealing nose D, box cupling sealing nose
1, external screw thread 2, internal thread
3, external seal taper surface 4, interior sealing taper surface
5, the outer torque shoulder 6 of wedge shape, wedge shape internal torque shoulder
The specific embodiment
In conjunction with the accompanying drawings high sealability buttless thread casing-pipe connection structure of the present utility model is illustrated.
As Figure 1-3, high sealability buttless thread casing-pipe connection structure of the present utility model, it includes the box cupling B that two ends have internal thread and inner conical sealing surface and wedge shape torque shoulder, also has two sleeve A that have external screw thread and male-tapered sealing surface and wedge shape torque shoulder respectively to connect to form.
The sleeve A end is that external screw thread 1 is screwed with box cupling B end internal thread 2, and sealing taper surface 4 in the D section of box cupling B end is provided with is provided with wedge shape internal torque shoulder 6 in the end of interior sealing taper surface 4.The C section of described sleeve A end is provided with external seal taper surface 3, is provided with torque shoulder 5 outside the wedge shape in the end of sleeve A end external seal taper surface 3.The interior sealing taper surface 4 of box cupling B end internal thread 2 and wedge shape internal torque shoulder 6 contact with external screw thread 1 external seal taper surface 3 and the outer torque shoulder 5 of wedge shape, and the thread form of described internal thread 2 and external screw thread 1 is zigzag structure.Because the thread form half-angle that the screw thread bearing surface is 3 ° is less than the angle of friction of metal to metal, therefore above-mentioned saw-tooth thread has good self-locking property under the effect of tensile load.
The cone angle that seals taper surface 4 and external screw thread external seal taper surface 3 among Fig. 3 in the internal thread is 20 °, the cone-shaped seal structure that box cupling and sleeve pipe formation metal and metal are closely contacted, the sealed diameter of interior sealing taper surface 4 is less than the sealed diameter of external screw thread external seal taper surface 3.The sealed diameter of interior sealing taper surface 4 and external seal taper surface 3 can satisfy the requirement of hermetic seal according to the tolerance processing of design to guarantee the interior magnitude of interference that seals between taper surface 4 and the external seal taper surface 3.Wedge shape internal torque shoulder 6 provides accurate localization, and after sleeve A and box cupling B twisted and connect, the diameter magnitude of interference of interior sealing taper surface 4 and external seal taper surface 3 was in the scope of a Seal Design requirement.Wedge shape internal torque shoulder 6, the outer torque shoulder 5 of wedge shape all are designed to 10 ° of corner structures, can strengthen the sealability of the metal to metal of box cupling B and sleeve A.
Concrete enforcement originally is threaded and adopts following data:
This sleeve A all adopts zigzag structure with the internal and external threads that is threaded of box cupling B, the angle that the angle of carrying side is 3 °, import the side is that 57 °, the pitch of screw thread are that the tooth depth of 4.233mm (along axis direction), screw thread is 1.880mm (perpendicular to an axis), the crest circular arc is 0.450mm, and circular arc is 60 ° for the 0.420mm angle of thread at the bottom of the tooth; The tapering of screw thread is 1: 16; Fit clearance at the bottom of the crest tooth is 0.030mm; Internal and external threads straightway engagement height is 1.000mm.
Claims (5)
1, a kind of high sealability buttless thread casing-pipe connection structure, it has box cupling that externally threaded sleeve pipe and end have internal thread by an end and screws lemon and connect and form, and it is characterized in that:
The D section of the internal thread (2) of the C section of the external screw thread of described sleeve A (1) and box cupling B all is set to have the taper thread of the saw-tooth thread thread form of self-locking property, and the D of described internal and external screw thread, C section are provided with the primary seal structure that conical seal (contact) face and wedge shape torque shoulder are formed.
2, high sealability buttless thread casing-pipe connection structure according to claim 1 is characterized in that: described saw-tooth thread with self-locking property, and the approaching face angle of its profile of tooth is 57 °, and the bearing surface angle is 3 °, and thread angle is 60 °.
3, high sealability buttless thread casing-pipe connection structure according to claim 1, it is characterized in that: described primary seal structure comprises: sealing taper surface (4) in the D section of described box cupling B end is provided with is provided with wedge shape internal torque shoulder (6) in the end of interior sealing taper surface (4); The C section of described sleeve A end is provided with external seal taper surface (3), is provided with torque shoulder outside the wedge shape (5) in the end of external seal taper surface (3); Interior sealing taper surface (4) and wedge shape internal torque shoulder (6) contact with external seal taper surface (3) and the outer torque shoulder (5) of wedge shape.
4, high sealability buttless thread casing-pipe connection structure according to claim 1 is characterized in that: it is 10 ° of angles that the angle of the wedge shape internal torque shoulder (6) of described internal thread, the outer torque shoulder (5) of external screw thread wedge shape and sleeve A cross section all is.
5, high sealability sawtooth pattern threaded sleeve syndeton according to claim 1 is characterized in that: the cone angle of sealing taper surface (4) and external screw thread external seal taper surface (3) is 20 ° in the described internal thread.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620026316 CN200971757Y (en) | 2006-06-08 | 2006-06-08 | High seal buttless thread double-pipe connection structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620026316 CN200971757Y (en) | 2006-06-08 | 2006-06-08 | High seal buttless thread double-pipe connection structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN200971757Y true CN200971757Y (en) | 2007-11-07 |
Family
ID=38883013
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620026316 Expired - Lifetime CN200971757Y (en) | 2006-06-08 | 2006-06-08 | High seal buttless thread double-pipe connection structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN200971757Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101871324A (en) * | 2010-07-09 | 2010-10-27 | 天津钢管集团股份有限公司 | Connecting structure of special high-pressure completion oil pipe |
| CN101899953A (en) * | 2010-08-16 | 2010-12-01 | 天津钢管集团股份有限公司 | Thread joint structure for high-performance oil casing |
| CN102720440A (en) * | 2012-06-16 | 2012-10-10 | 无锡西姆莱斯石油专用管制造有限公司 | High-sealed BCSG joint |
| CN103403289A (en) * | 2010-12-29 | 2013-11-20 | 阿贾伊·尚德 | Coupler with bonding surface |
| CN110374522A (en) * | 2019-06-28 | 2019-10-25 | 中国石油天然气集团有限公司 | A kind of shale gas exploitation nipple |
-
2006
- 2006-06-08 CN CN 200620026316 patent/CN200971757Y/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101871324A (en) * | 2010-07-09 | 2010-10-27 | 天津钢管集团股份有限公司 | Connecting structure of special high-pressure completion oil pipe |
| CN101899953A (en) * | 2010-08-16 | 2010-12-01 | 天津钢管集团股份有限公司 | Thread joint structure for high-performance oil casing |
| CN103403289A (en) * | 2010-12-29 | 2013-11-20 | 阿贾伊·尚德 | Coupler with bonding surface |
| CN103403289B (en) * | 2010-12-29 | 2017-06-16 | 阿贾伊·尚德 | Connector with adhesive surface |
| CN102720440A (en) * | 2012-06-16 | 2012-10-10 | 无锡西姆莱斯石油专用管制造有限公司 | High-sealed BCSG joint |
| CN102720440B (en) * | 2012-06-16 | 2015-09-02 | 无锡西姆莱斯石油专用管制造有限公司 | High sealability buttress thread casing joint |
| CN110374522A (en) * | 2019-06-28 | 2019-10-25 | 中国石油天然气集团有限公司 | A kind of shale gas exploitation nipple |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: TIANJIN STEEL TUBE GROUP CO., LTD. Free format text: FORMER NAME OR ADDRESS: TIANJIN STEEL PIPE GROUP CO., LTD. |
|
| CP03 | Change of name, title or address |
Address after: 300301 Jintang Road, Dongli District, Tianjin Patentee after: Tianjin Steel Pipe Group Co., Ltd. Address before: 300301 Jintang Road, Dongli District, Tianjin Patentee before: Tianjin Pipe (Group) Corp. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20071107 |
|
| EXPY | Termination of patent right or utility model |