CN202673177U - High sealing partial trapezoidal thread casing pipe connector - Google Patents
High sealing partial trapezoidal thread casing pipe connector Download PDFInfo
- Publication number
- CN202673177U CN202673177U CN 201220284083 CN201220284083U CN202673177U CN 202673177 U CN202673177 U CN 202673177U CN 201220284083 CN201220284083 CN 201220284083 CN 201220284083 U CN201220284083 U CN 201220284083U CN 202673177 U CN202673177 U CN 202673177U
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- box cupling
- thread
- wedge shape
- casing joint
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Abstract
The utility model relates to a high sealing partial trapezoidal thread casing pipe connector which comprises a connecting hoop and a pipe body. An inner step column face is arranged in the middle of the connecting hoop. Standard partial trapezoidal internal threads are machined at two ends of the connecting hoop, wedge-shaped inner threads are arranged at rear ends of the partial trapezoidal internal threads, standard partial trapezoidal external threads are machined on end portions of the pipe body, and wedge-shaped external threads are arranged at front ends of the partial trapezoidal external threads. Metal sealing structures are respectively arranged between two end faces of the inner step column face and the end portions of the pipe body. Each metal sealing structure comprises an inner sealing structure arranged on the connecting hoop and an outer sealing structure arranged on the pipe body. The inner sealing structure comprises an inner sealing face and a groove of an end face of the inner step column face. The outer sealing structure comprises an outer sealing face and protrusions on end faces of the pipe body. According to the high sealing partial trapezoidal thread casing pipe connector, wedge-shaped threads and non-plane circular bead sealing structures are added on the end portions of the standard partial trapezoidal threads, so that connection strength, sealing performance, anti-bending performance, ability resisting compression load and anti-torque performance of the connector are improved.
Description
Technical field
The utility model relates to the oil well pipe screwed joints that is applied to petroleum industry, specifically a kind of high sealability buttress thread casing joint.
Background technology
Tubing and casing in the oil well pipe industry mainly is to couple together by nipple, form oil casing, length reaches thousands of rice, and wherein the quality of the performances such as the bonding strength of nipple, sealing performance, counter-bending ability, torque resistant performance and tensile load directly affects the quality of connection of oil well pipe.Different geologic structures needs the oil well pipe of the different forms that is threaded, to satisfy instructions for use.
Along with the development of oilfield exploitation, more and more stricter to the requirement of oil well pipe screwed joints, particularly require more and more higher to the relevant main performance index of oil well pipe.Existing API(American Petroleum Institute (API)) buttress thread joint, exist the torque resistant performance a little less than, bonding strength is low, poor sealing performance, the anti-deficiencies such as ruining ability of squeezing.Each oil well pipe processing enterprise new designs of threaded joints of the world is constantly innovated, and different helicitic texture types of attachment occurred, but still can not satisfy the instructions for use of oilfield exploitation.
Summary of the invention
The utility model provides a kind of high sealability buttress thread casing joint for the problems referred to above, and this joint bonding strength is high, good seal performance, and incompressible load can be strong, and the torque resistant performance is high simultaneously.
According to the technical solution of the utility model: a kind of high sealability buttress thread casing joint, comprise the box cupling and the body that are threaded connection, the axial middle part of described box cupling inwall is provided with the interior step cylinder of ring-type; The two ends of described box cupling are processed with the inclined to one side trapezoidal internal thread of standard, described inclined to one side trapezoidal internal thread is provided with the wedge shape internal thread near the rear end of described interior step cylinder, be processed with the partially trapezoidal external screw thread of standard on the outer wall of described body end, described partially trapezoidal externally threaded front end is provided with the wedge shape external screw thread, and the externally threaded tooth side angle of described wedge shape internal thread and described wedge shape is negative angle; Be respectively arranged with shape metallic leak-proof structure between the both ends of the surface of described interior step cylinder and the end of described body, described shape metallic leak-proof structure comprises and is arranged on the inner seal structure on the described box cupling and is arranged on outer seal configuration on the described body; Described inner seal structure comprises the inner sealing surface that is arranged between described interior step cylinder end face and the described coupling inner thread end, and the radially middle part of the end face of described interior step cylinder inwardly concaves the formation groove; Described outer seal configuration comprises the external seal face that is arranged on the outer wall of described body end, the outwardly formation projection in the radially middle part of described body end face.
The value of described tooth side angle is 5 ° ~ 15 °.
The externally threaded tooth number of described wedge shape internal thread and described wedge shape is 1 ~ 5 tooth.
The acute angle that forms between one side of described interior step cylinder end face groove and the described box cupling axis is the inner sealing surface chamfering, the value of described inner sealing surface chamfering is 10 ° ~ 30 °, the acute angle that its another side and described box cupling form between radially is interior shoulder bevel, and the value of described Inner shoulder bevel is 8 ° ~ 35 °; The acute angle that forms between one side of described body head face hump and the axis of described body is the external seal surface chamfer, described external seal surface chamfer is identical with the value of described inner sealing surface chamfering, the acute angle that its another side and described body form between radially is outer shoulder bevel, and described outer shoulder bevel is less 0 ~ 2 ° than described Inner shoulder bevel.
The place, summit of described interior step cylinder end face groove is provided with the inner vertex circular arc, and the radius of described inner vertex circular arc is 0.20 ~ 1.2mm; The place, summit of described body head face hump is provided with outer dead centre circular arc, the large 0 ~ 0.5mm of radius of the described inner vertex circular arc of the radius ratio of described outer dead centre circular arc.
The length of described inner sealing surface is 4 ~ 10mm, the long half pitch of the length of the described inner sealing surface of Length Ratio of described external seal face.
The interior shoulder thickness of described inner seal structure is 4 ~ 10mm, and the outer shoulder thickness of described outer seal configuration equates with described interior shoulder thickness.
Be provided with inner cylinder face on the inwall of described body end, described inner cylinder face links to each other with the endoporus of described body by the transition conical surface, and the length of described inner cylinder face is 5 ~ 20mm.
Technique effect of the present utility model is: the utility model has increased the on-plane surface shoulder hermetically-sealed construction of wedge thread and metal and metal in the end of standard buttress thread, has increased bonding strength, sealing performance, counter-bending ability, incompressible load-carrying ability and the torque resistant performance of joint.
Description of drawings
Fig. 1 is structural representation of the present utility model.
Fig. 2 is the structural representation after the utility model decomposes.
Fig. 3 is the tooth form figure of the wedge shape in the utility model.
Fig. 4 is the enlarged drawing of the inner seal structure in the utility model.
Fig. 5 is the enlarged drawing of the outer seal configuration in the 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. 5, comprise box cupling 1, body 2, inclined to one side trapezoidal internal thread 3, partially trapezoidal external screw thread 4, wedge shape internal thread 5, wedge shape external screw thread 6, inner seal structure 7, outer seal configuration 8, middle line 9, interior shoulder cylinder 10, tapering 11, pitch 12, tooth depth 13, the flute profile tooth is wide by 14, flute profile groove width 15, tooth side angle 16, flute profile circular arc 17, inner sealing surface 18, external seal face 19, inner sealing surface chamfering length 20, external seal surface chamfer length 21, interior shoulder thickness 22, outer shoulder thickness 23, inner vertex circular arc 24, outer dead centre circular arc 25, inner sealing surface chamfering 26, external seal surface chamfer 27, interior shoulder bevel 28, outer shoulder bevel 29, inner cylinder face 30, the transition conical surface 31, body 32 etc.
As shown in Figure 1 and Figure 2, the utility model is a kind of high sealability buttress thread casing joint, comprise the box cupling 1 and the body 2,32 that are threaded connection, box cupling 1 and body 2, the 32nd are take virtual middle line 9 as benchmark, screw with internal and external threads, carry out some oil, casing strings of being connected to form with body 2 and body 34 by box cupling 1, satisfy the requirement of oil gas field production and application.
The axial middle part of box cupling 1 inwall is provided with the interior step cylinder 10 of ring-type.The length range of interior step cylinder 10 is 50 ~ 200mm, can increase bonding strength and the counter-bending ability of joint.
The two ends of box cupling 1 are processed with the inclined to one side trapezoidal internal thread 3 of standard, and trapezoidal internal thread 3 is provided with wedge shape internal thread 5 near the rear end of interior step cylinder 10 partially.The partially trapezoidal external screw thread 4 of the standard that is processed with on the outer wall of body 2,32 ends, the front end of partially trapezoidal external screw thread 4 is provided with wedge shape external screw thread 6.Trapezoidal internal thread 3 adopts the API standard with partially trapezoidal external screw thread 4 partially.
As shown in Figure 3, wedge shape internal thread 5 seal requests when reaching interference fits different from wedge shape external screw thread 6 measure-alike tolerances.Wedge shape internal thread 5 is negative angle with the tooth side angle 16 of wedge shape external screw thread 6, and the value of tooth side angle 16 is 5 ° ~ 15 °.Wedge shape internal thread 5 be that 1:16, pitch 12 are 5.08mm with the tapering 11 of wedge shape external screw thread 6, and its tapering, pitch are identical with the API standard, when wedge thread screws, screw freely under the guiding of buttress thread, any interference can not occur.Wedge shape internal thread 5 is 0.40mm ~ 0.50mm for 1.50mm ~ 2.07mm, flute profile groove width 15 for 2.55mm ~ 3.03mm, flute profile circular arc 17 radiuses for 1.00mm ~ 1.43mm, flute profile tooth wide 14 with the tooth depth 13 of wedge shape external screw thread 6.Wedge shape internal thread 5 is 1 ~ 5 tooth with the tooth number of wedge shape external screw thread 6.
Adding man-hour, buttress thread should seamlessly transit during to the wedge thread transition deformation, and transition face length can not surpass the length of 1 pitch.The total length of buttress thread and wedge thread can be by reducing or increase buttress thread tooth number, also can satisfy by reducing or increase wedge thread tooth number the total length requirement of body 2, the processing of 32 ends, but the tooth number of its increase or minimizing can not surpass 4 teeth, and the processing of its box cupling 1 screw thread is identical.
Again referring to Fig. 1 and Fig. 2, between the both ends of the surface of box cupling 1 interior step cylinder 10 and body 2,32 end, be respectively arranged with shape metallic leak-proof structure.Shape metallic leak-proof structure comprises the inner seal structure 7 that is arranged on the box cupling 1 and is arranged on outer seal configuration 8 on the body 2,32.
As shown in Figure 4, inner seal structure 7 comprises the inner sealing surface 18 that is arranged between interior step cylinder 10 end faces and box cupling 1 internal threaded end, and the length of inner sealing surface 18 is 4 ~ 10mm, and the interior shoulder thickness 22 of inner seal structure 7 is 4 ~ 10mm.The radially middle part of the end face of interior step cylinder 10 inwardly concaves the formation groove, the acute angle that forms between one side of groove and box cupling 1 axis is inner sealing surface chamfering 26, the value of inner sealing surface chamfering 26 is 10 ° ~ 30 °, the acute angle that its another side and box cupling 1 form between radially is interior shoulder bevel 28, and the value of Inner shoulder bevel 28 is 8 ° ~ 35 °.The place, summit of interior step cylinder 10 end face grooves is provided with inner vertex circular arc 24, and the radius of inner vertex circular arc 24 is 0.20 ~ 1.2mm.
As shown in Figure 5, outer seal configuration 8 comprises the external seal face 19 that is arranged on body 2, the 32 end outer walls, the long half pitch of the length of the Length Ratio inner sealing surface 18 of external seal face 19 does not interfere with wedge shape external screw thread 6 closely cooperating under high pulling torque to satisfy wedge shape internal thread 5.The outer shoulder thickness 23 of outer seal configuration 8 equates with interior shoulder thickness 22, with after satisfying it and closely cooperating on same plane, can not cause oil gas turbulent phenomenon in body, reach smoothly and pass through smoothly.The outwardly formation projection in the radially middle part of body 2,32 end faces, the acute angle that forms between one side of projection and body 2,32 the axis is external seal surface chamfer 27, external seal surface chamfer 27 is identical with the value of inner sealing surface chamfering 26, the acute angle that its another side and body 2,32 form between radially is outer shoulder bevel 29, outer shoulder bevel 29 is less 0 ~ 2 ° than Inner shoulder bevel 28, with 0.5 ° ~ 1 ° the best, satisfy the state of plastic deformation that inside and outside shoulder causes and be issued to the interference fit state in the tight situation of machine.The place, summit of body 2,32 head face humps is provided with outer dead centre circular arc 25, large 0 ~ the 0.5mm of radius of the radius ratio inner vertex circular arc 24 of outer dead centre circular arc 25,, to satisfy inside and outside shoulder under the tight state of machine, inside and outside circular arc causes state of plastic deformation to be issued to the interference fit state when cooperating.Be provided with inner cylinder face 30 on the inwall of body 2,32 ends, inner cylinder face 30 links to each other by the transition conical surface 31 and body 2,32 endoporus, the length of inner cylinder face 30 is 5 ~ 20mm, the transition conical surface 31 length are not done requirement, the length of its inner cylinder face 30 and the transition conical surface 31 can be stipulated according to body 2,32 wall thickness, can keep same plane and seamlessly transit getting final product with interior step cylinder 10 after closely cooperating.
During the utility model operation, any end of box cupling 1 is inserted in first on the body 2, overlap and fashionablely the external screw thread of the internal thread of box cupling 1 and body 2 should be inserted in first 3 ~ 7 buttons, should be light and slow during hitch with outer external screw thread make-up then manpower screw in, with manpower screw motionless be till, the hand-tight box cupling that spins together 1 and body 2 usefulness petroleum pipeline screw-on machine devices are carried out further machine twist and access machine and twist interference fit state when connecing.
When box cupling 1 and body 2 machine twist take over be full of screw cooperate after, its wedge shape internal thread 5, wedge shape external screw thread 6 screw under the guiding buttress thread, can be smooth the screw-in pairing reach the interference fits state type and become certain sealing, wedge thread can significantly increase its bonding strength and counter-bending ability, its wedge thread flute profile has high sealing performance, the high composite bearing ability of Effective Raise nipple can provide the interior pressure drag suitable with body; Shoulder thickness 22, outer shoulder thickness 23 have reached interference fit simultaneously, have greatly increased the ability of its high resistance torsional performance and compressive load ability and tensile load.Simultaneously both external diameters of inner sealing surface 18 and external seal face 19 form radial interference fit, greatly increase the sealing performance of its cooperation, make joint have multi-sealing structure, the high composite bearing ability of Effective Raise nipple; The position that machine is tight and torque can be made separate stipulations according to API standard operation or technical papers, but shoulder thickness 22, outer shoulder thickness 23 must not have any gap in must satisfying after machine tightly screws.Same fastening method is to closely cooperate take virtual middle line 9 as benchmark with its box cupling 1 and body 32, reach body 32 and body 2 by box cupling 1 carry out somely being connected to form oil, casing string satisfies the requirement of oil gas field production and application.When go into the well in the oil field, its connector machine stressed joint is one by one formed thousands of meters oil casing.
The utility model has increased the wedge thread hermetically-sealed construction in the end of standard buttress thread, wedge thread can significantly increase bonding strength and the counter-bending ability of joint, its wedge type thread tooth type has high sealing performance, the high composite bearing ability of Effective Raise nipple, can provide the interior pressure drag suitable with body, anti-tripping performance and the tensile load performance of wedge type screw thread Effective Raise nipple; The utility model has adopted the on-plane surface shoulder hermetically-sealed construction of metal and metal simultaneously, has reached the multi-sealing structure of nipple, has greatly increased incompressible load-carrying ability and torque resistant performance and high sealing performance.The utility model is fit to deep-well, ultradeep well, high pressure oil wells and high-pressure gas well very much to be used.
Claims (8)
1. a high sealability buttress thread casing joint comprises the box cupling (1) and the body (2,32) that are threaded connection, and the axial middle part of described box cupling (1) inwall is provided with the interior step cylinder (10) of ring-type; It is characterized in that: the two ends of described box cupling (1) are processed with the inclined to one side trapezoidal internal thread of standard (3), described inclined to one side trapezoidal internal thread (3) is provided with wedge shape internal thread (5) near the rear end of described interior step cylinder (10), be processed with the partially trapezoidal external screw thread of standard (4) on the outer wall of described body (2,32) end, the front end of described partially trapezoidal external screw thread (4) is provided with wedge shape external screw thread (6), and described wedge shape internal thread (5) is negative angle with the tooth side angle (16) of described wedge shape external screw thread (6); Be respectively arranged with shape metallic leak-proof structure between the end of the both ends of the surface of described interior step cylinder (10) and described body (2,32), described shape metallic leak-proof structure comprises the inner seal structure (7) that is arranged on the described box cupling (1) and is arranged on outer seal configuration (8) on the described body (2,32); Described inner seal structure (7) comprises the inner sealing surface (18) that is arranged between described interior step cylinder (10) end face and described box cupling (1) internal threaded end, and the radially middle part of the end face of described interior step cylinder (10) inwardly concaves the formation groove; Described outer seal configuration (8) comprises the external seal face (19) that is arranged on described body (2,32) the end outer wall, the outwardly formation projection in the radially middle part of described body (2,32) end face.
2. according to high sealability buttress thread casing joint claimed in claim 1, it is characterized in that: the value of described tooth side angle (16) is 5 ° ~ 15 °.
3. according to high sealability buttress thread casing joint claimed in claim 1, it is characterized in that: described wedge shape internal thread (5) is 1 ~ 5 tooth with the tooth number of described wedge shape external screw thread (6).
4. according to high sealability buttress thread casing joint claimed in claim 1, it is characterized in that: the acute angle that forms between one side of described interior step cylinder (10) end face groove and described box cupling (1) axis is inner sealing surface chamfering (26), the value of described inner sealing surface chamfering (26) is 10 ° ~ 30 °, the acute angle that its another side and described box cupling (1) form between radially is interior shoulder bevel (28), and the value of described Inner shoulder bevel (28) is 8 ° ~ 35 °; The acute angle that forms between one side of described body (2,32) head face hump and the axis of described body (2,32) is external seal surface chamfer (27), described external seal surface chamfer (27) is identical with the value of described inner sealing surface chamfering (26), the acute angle that its another side and described body (2,32) form between radially is outer shoulder bevel (29), and described outer shoulder bevel (29) is less 0 ~ 2 ° than described Inner shoulder bevel (28).
5. according to high sealability buttress thread casing joint claimed in claim 4, it is characterized in that: the place, summit of described interior step cylinder (10) end face groove is provided with inner vertex circular arc (24), and the radius of described inner vertex circular arc (24) is 0.20 ~ 1.2mm; The place, summit of described body (2,32) head face hump is provided with outer dead centre circular arc (25), the large 0 ~ 0.5mm of radius of the described inner vertex circular arc of the radius ratio of described outer dead centre circular arc (25) (24).
6. according to high sealability buttress thread casing joint claimed in claim 1, it is characterized in that: the length of described inner sealing surface (18) is 4 ~ 10mm, the long half pitch of the length of the described inner sealing surface of Length Ratio (18) of described external seal face (19).
7. according to high sealability buttress thread casing joint claimed in claim 1, it is characterized in that: the interior shoulder thickness (22) of described inner seal structure (7) is 4 ~ 10mm, and the outer shoulder thickness (23) of described outer seal configuration (8) equates with described interior shoulder thickness (22).
8. according to high sealability buttress thread casing joint claimed in claim 1, it is characterized in that: be provided with inner cylinder face (30) on the inwall of described body (2,32) end, described inner cylinder face (30) links to each other by the endoporus of the transition conical surface (31) with described body (2,32), and the length of described inner cylinder face (30) is 5 ~ 20mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220284083 CN202673177U (en) | 2012-06-16 | 2012-06-16 | High sealing partial trapezoidal thread casing pipe connector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220284083 CN202673177U (en) | 2012-06-16 | 2012-06-16 | High sealing partial trapezoidal thread casing pipe connector |
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| Publication Number | Publication Date |
|---|---|
| CN202673177U true CN202673177U (en) | 2013-01-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220284083 Expired - Fee Related CN202673177U (en) | 2012-06-16 | 2012-06-16 | High sealing partial trapezoidal thread casing pipe connector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202673177U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN104832112A (en) * | 2015-05-29 | 2015-08-12 | 聊城安泰石油机械有限公司 | ATPM-I type oil tube and sleeve sealing connection device, pipe and coupling |
-
2012
- 2012-06-16 CN CN 201220284083 patent/CN202673177U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN104832112A (en) * | 2015-05-29 | 2015-08-12 | 聊城安泰石油机械有限公司 | ATPM-I type oil tube and sleeve sealing connection device, pipe and coupling |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| PP01 | Preservation of patent right |
Effective date of registration: 20140922 Granted publication date: 20130116 |
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| RINS | Preservation of patent right or utility model and its discharge | ||
| PD01 | Discharge of preservation of patent |
Date of cancellation: 20150322 Granted publication date: 20130116 |
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| RINS | Preservation of patent right or utility model and its discharge | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130116 Termination date: 20200616 |
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| CF01 | Termination of patent right due to non-payment of annual fee |