CN2731065Y - Air sealed threaded sleeve joint - Google Patents
Air sealed threaded sleeve joint Download PDFInfo
- Publication number
- CN2731065Y CN2731065Y CN 200420059633 CN200420059633U CN2731065Y CN 2731065 Y CN2731065 Y CN 2731065Y CN 200420059633 CN200420059633 CN 200420059633 CN 200420059633 U CN200420059633 U CN 200420059633U CN 2731065 Y CN2731065 Y CN 2731065Y
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- China
- Prior art keywords
- screw thread
- thread
- tapering
- hermetic seal
- seal casing
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- Expired - Lifetime
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- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
Abstract
The utility model discloses an economical air sealed threaded sleeve joint, comprising two male threads 1, a coupling 2, and a screw thread 3 connecting the two male threads 1 and the screw thread 3. Improved API buttress thread is adopted in the utility model, which is characterized in that the air sealed threaded sleeve joint keeps the internal screw thread dedendum unchanged, while lowering the external screw thread dedendum by more than 0.20 millimeters, reducing the interference among screw threads. The seal structure is formed by pyramidal face against pyramidal face and the conicity in the seal portion is the same; the seal portion is at least 5 millimeters long. The radial shrink range is greater than 0.2 millimeters. The tri-stage conicity stucture is adopted for easy-processing external screw thread: 1/16 for diametral conicity in screw thread portion; 1/12-1/6 for seal portion conicity; 1/5-1/3 for end conicity. The circular arc is used for transition among different conicities. The utility model is easy for processing and can be applied to the oil and gas well with high sealability requirement, in particular to the middle and low-voltage gas well.
Description
Technical field
The utility model relates to a kind of petroleum industry with economical hermetic seal casing thread connection.
Background technology
The hermetic seal casing thread connection generally is made up of screw thread, sealing and torque shoulder.For many years, people are always by constantly improving screw thread, sealing and the torque shoulder of joint, to reach the hermetic seal requirement of design.By Chinese patent Information Network and United States Patent (USP) trademark office net oil well pipe thread joint patent is retrieved, and result for retrieval is analyzed, the result is as follows:
Patent 85107996 and 86106732 has provided the method that adopts the synthetic materials filler to fill whole gaps of screw thread or local gap and has reached higher sealing, and has provided detailed implementation method and implementing process.
Patent 96232958.4 adopts the API buttress thread, and the conical surface is to protruding garden hermetically-sealed construction and right angle torque shoulder.
Patent 96223035.9,96223036.7 adopts the API buttress thread of distortion, and screw thread bearing surface angle changes 0-3 ° into by 3 °, and screw thread spigot surface angle changes 10-45 ° into by 10 °; Cylinder is to the hermetically-sealed construction of cylinder, and the external screw thread sealing surface is by the conical surface or the guiding of circular arc nose angle; The right angle torque shoulder.
Patent 96222992.X adopts the API buttress thread of distortion, and screw thread bearing surface angle changes 0-3 ° into by 3 °, and screw thread spigot surface angle changes 10-45 ° into by 10 °; Cylinder is to protruding garden hermetically-sealed construction, and the external screw thread sealing surface is guided by circular arc chamfering; The right angle torque shoulder.
Patent 96223034.0 adopts the API buttress thread of distortion, and screw thread bearing surface angle changes 0-3 ° into by 3 °, and screw thread spigot surface angle changes 10-45 ° into by 10 °; Cylinder is to the hermetically-sealed construction of cylinder, and the external screw thread sealing surface is guided by the circular arc nose angle; External screw thread adopts circular arc end face and internal thread to constitute secondary sealing and torque shoulder.
Patent 98207389.5 adopts API garden screw thread or buttress threads, and the conical surface is to the primary seal in protruding garden and the cylinder secondary hermetically-sealed construction to cylinder, reactive torque shoulder.
Patent 95112787.5 is characterised in that, tightening the position, externally threaded end face mutually against, and form intermetallic contact, the no screw thread circumferential area that each external screw thread is adjacent to antetheca has the hermetically-sealed construction that a taper nonreentrant surface and internal thread constitute metal to metal.
Patent 00244669.3 adopts improved API buttress thread, and the internal and external screw thread tooth depth is a little less than standard thread, and the external screw thread end processes a taper surface, plays the effect of sealing, right angle torque shoulder structure by the joint ring on the taper surface.
Patent 01253367.X adopts the API buttress thread of distortion, and screw thread bearing surface angle changes 0-3 ° into by 3 °, and screw thread spigot surface angle changes 10-45 ° into by 10 °; Cylinder has the reactive torque shoulder of differential seat angle to the double sealing structure in protruding garden.
Patent 98800358.9 has provided at external screw thread or/and the disappearance position of internal thread processes a cannelure, and fills enhanced leaktightness with composite material.
Patent 022182632.2 adopts the API buttress thread, ball face sealing face and the inclined-plane sealing surface that cooperatively interacts is set respectively between main moment of torsion step and moment of torsion step, between the main moment of torsion step of inner thread piece and inclined-plane sealing, the cylindrical hole sealing surface is set, between the main moment of torsion step of external thread piece and ball face sealing, be provided with column sealed, between the cross section of the end face of moment of torsion step and connector, angle α arranged.
Patent 01810763.x has provided a kind of helicitic texture that has tip clearance and spigot surface gap.
Patent 01807217.8 has provided a kind of buttress thread of distortion, and screw thread bearing surface angle is by being 0-(10) °, and screw thread spigot surface angle is 35-50 °.
Patent 02209453.9 adopts the API buttress thread, the hermetically-sealed construction of the metal to metal of the conical surface, and there is the escape transition at the sealing position to torque shoulder, the right angle torque shoulder.
United States Patent (USP) 5423759 has been announced the hermetically-sealed construction of a kind of conical surface to the vertebra face, and its characteristics are by the interference between the tapering difference realization sealing surface of internal and external threads sealing cone.
United States Patent (USP) 4817962 is announced a kind of hermetically-sealed construction that adopts the conical surface to the vertebra face, and its characteristics are by the interference between the tapering difference realization sealing surface of internal and external threads sealing cone, and have provided the size of different grade of steel lower seal length.
Above result shows that aspect screw thread design, the patent of an announcement part adopts the API buttress thread, as: patent 96232958.4 etc.; Some adopts the API buttress thread of distortion, as: 96223035.9 etc.; In addition, also have to adopt to change the internal and external screw thread tooth depth, as: patent 00244669.3.Adopt the API buttress thread fully,, thereby reduced the contact pressure of sealing surface, reduce sealing because thread interference is bigger; Adopt the API buttress thread of distortion, difficulty of processing is big, needs special measuring apparatus, non-interchangeability; Change the high size of thread, it is big that difficulty of processing becomes.
Aspect Seal Design, the patent of domestic announcement mainly contains: the material filling type sealing is promptly crammed screw thread leakage path such as patent 85107996 etc., metal to metal seal with nonmetals.Aspect the structure design of metal to metal seal, domestic patent mainly adopts cylinder to cylinder, and cylinder is to sphere, and the conical surface is to sphere, and the sealing position generally is positioned at thread head, as patent 96232958.4 etc.Adopt cylinder to cylinder, cylinder is to sphere, and the conical surface causes the sealing surface bonding easily to the hermetically-sealed construction of sphere, reduces sealing, and to the requirement on machining accuracy strictness.Material filling type sealing causing easily screw thread thread gluing, and sealing less stable, complex operation.In addition, adopt the hermetically-sealed construction of the conical surface abroad, utilize the tapering difference to realize interference the conical surface, as: United States Patent (USP) 5423759 etc., but under axial loading, seal failure easily takes place.
At the torque shoulder design aspect, the patent of domestic announcement mainly contains: right angle shoulder, reverse shoulder in addition, also have and adopt two torque shoulder.
Summary of the invention
The purpose of this utility model is to provide a kind of amount of interference that reduces screw-threaded engagement, makes requirement on machining accuracy loose, and the hermetically-sealed construction of sealing good stability is convenient to extensive enforcement, improves the hermetic seal casing thread connection of working (machining) efficiency simultaneously.
The utility model is achieved in that and comprises male connection 1, box cupling 2, screw thread 3, escape or transition region 4, sealing surface 5, male connection shoulder transition face 6, circular bead surface 7, male connection 1 is provided with box cupling 2, adopt the hermetically-sealed construction of the conical surface to the conical surface, and the tapering of hermetic unit is identical, and the length of hermetic unit is at least 5mm, the radial interference amount greater than 0.20mm in male connection 1, escape or transition region 4 are arranged respectively between the box cupling 2, sealing surface 5, male connection shoulder transition face 6, circular bead surface 7.
External screw thread, the structure of three sections taperings of employing, the diametric tapering of threaded portion is 1/16, and the hermetic unit tapering is within the 1/12-1/6 scope, and the end tapering is 1/5-1/3, adopts arc transition between the tapering.
Internal thread, the structure of two sections or three sections taperings of employing, the tapering size is identical with corresponding external screw thread.
The cylinder transition is adopted with the sealing position in the screw thread position.
When internal and external screw thread meshed, there was the gap in part.
Torque shoulder adopts right angle or reverse structure.
Screw thread 3 tooth depths of male connection 1 reduce more than the 0.20mm.
Be connected with box cupling 2 by screw thread 3 in the male connection 1.
The utility model screw thread adopts improved API buttress thread, and its characteristics are to keep the tooth depth of internal thread constant, thereby with the amount of interference that reduces between the screw thread.Adopt the hermetically-sealed construction of the conical surface to the conical surface, and the tapering of hermetic unit is identical, the length of hermetic unit is at least 5mm, and the radial interference amount is greater than 0.20mm.For the not high external screw thread of difficulty of processing, adopt the structure of three sections taperings, the diametric tapering of threaded portion is 1/16, and the hermetic unit tapering is within the 1/12-1/6 scope, and the end tapering is 1/5-1/3, adopts arc transition between the different taperings.For the higher internal thread of difficulty of processing, adopt the structure of two sections or three sections taperings, the tapering size is identical with corresponding external screw thread.The cylinder transition is adopted with the sealing position in the screw thread position, and the cylinder of internal thread can be used as escape.When internal and external screw thread meshed, except that there was interference in hermetic unit, all there was certain clearance in other parts.Torque shoulder adopts right angle or reverse structure.
The utility model does not increase the difficulty of processing of screw thread, and has reduced the trend of screw thread thread gluing by reducing externally threaded tooth depth.Employing is with the hermetically-sealed construction of tapering, by increasing sealing area, guaranteed the sealing reliability of nipple, adopt arc transition between the different taperings, reduced the trend of sealing position screw thread thread gluing, adopted the hermetically-sealed construction of this awl awl, not high to the required precision of processing, improve production efficiency, reduced cost of production.
The utility model is applicable to oil, gas industrial oil, sleeve pipe, can be used for high pressure oil wells and the middle and high well of calming the anger.Because dependable performance of the present invention, difficulty of processing are little, can be used for all to the higher oil of sealing requirements, gas well, especially in, low-pressure gas well, have a extensive future.
Description of drawings
Fig. 1 is the utility model assembling schematic diagram.
Fig. 2 is that the utility model assembles local enlarged diagram.
Fig. 3 is the female thread structure schematic diagram.
Fig. 4 is the external thread structure schematic diagram.
Fig. 5 is the internal screw thread form structural representation.
Fig. 6 is an external screw thread shape and structure schematic diagram.
Fig. 7 is the structural representation of the utility model internal thread and external screw thread turntable.
The specific embodiment
Below in conjunction with drawings and Examples the utility model is further specified.
1. male connections among the figure, 2. box cupling, 3. screw thread, 4. escape or transition region, 5. sealing surface, 6. male connection shoulder transition face, 7. circular bead surface.
The specific embodiment
In Fig. 1, two male connections (1) couple together by screw thread (3) and box cupling (2), have constituted casing thread connection.Box cupling adopts API buttress thread (Fig. 5), and external screw thread adopts improved buttress thread (Fig. 6).Sealing surface (5) adopts the hermetically-sealed construction of the conical surface to the conical surface, and tapering is identical, and the diameter difference interference fit of male connection 1 and box cupling 2 realizes the sealing function of metal to metal.Escape or transition region 4 realize the transition of box cupling 2 screw threads and sealing surface 5, the damage of avoiding meshing the double thread face.Male connection 1 shoulder transition face (6) is realized the smooth transition of male connection 1 and box cupling 2, and is used to store unnecessary thread compound, guarantees joint 1 airtight quality.Circular bead surface (7) is owing to the location that is threaded and absorb too high torque wrench moment.
In the embodiment shown in fig. 7, when the engagement of internal thread and external screw thread,, make to have certain clearance with the external screw thread tooth top at the bottom of the internal thread tooth because tooth depth there are differences.The internal thread tooth depth is 1.575mm among the embodiment, and the external screw thread tooth depth is 1.375mm, differs 0.2mm between the two, thread gluing can not take place, and also can not produce bigger circumference stress.Implement illustration as can be seen by sealing, box cupling Gewindefreistiche (lead-over groove) (4) has been guaranteed the interference fit between the sealing surface (5), and torque shoulder (7) has guaranteed the size of the sealing surface length and the magnitude of interference.Length L=the 5mm of sealing surface among the embodiment, magnitude of interference δ=0.2mm.
Claims (8)
1, the hermetic seal casing thread connection, comprise male connection (1), box cupling (2), screw thread (3), escape or transition region (4), sealing surface (5), male connection shoulder transition face (6), circular bead surface (7), it is characterized in that: male connection (1) is provided with box cupling (2), adopt the hermetically-sealed construction of the conical surface to the conical surface therebetween, and the tapering of hermetic unit is identical, the length of hermetic unit is at least 5mm, the radial interference amount greater than 0.20mm in male connection (1), escape or transition region (4) are arranged respectively between the box cupling (2), sealing surface (5), male connection shoulder transition face (6), circular bead surface (7).
2, hermetic seal casing thread connection according to claim 1 is characterized in that: external screw thread, the structure of three sections taperings of employing, the diametric tapering of threaded portion is 1/16, the hermetic unit tapering is within the 1/12-1/6 scope, and the end tapering is 1/5-1/3, adopts arc transition between the tapering.
3, hermetic seal casing thread connection according to claim 1 is characterized in that: internal thread, and the structure of two sections or three sections taperings of employing, the tapering size is identical with corresponding external screw thread.
4, hermetic seal casing thread connection according to claim 1 is characterized in that: the cylinder transition is adopted with the sealing position in the screw thread position.
5, hermetic seal casing thread connection according to claim 1 is characterized in that: when internal and external screw thread meshed, there was the gap in part.
6, hermetic seal casing thread connection according to claim 1 is characterized in that: torque shoulder adopts the structure at right angle.
7, hermetic seal casing thread connection according to claim 1 is characterized in that: screw thread (3) tooth depth of male connection (1) reduces more than the 0.20mm.
8, hermetic seal casing thread connection according to claim 1 is characterized in that: male connection (1) is gone up by screw thread (3) and is connected with box cupling (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420059633 CN2731065Y (en) | 2004-05-21 | 2004-05-21 | Air sealed threaded sleeve joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420059633 CN2731065Y (en) | 2004-05-21 | 2004-05-21 | Air sealed threaded sleeve joint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2731065Y true CN2731065Y (en) | 2005-10-05 |
Family
ID=35051402
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420059633 Expired - Lifetime CN2731065Y (en) | 2004-05-21 | 2004-05-21 | Air sealed threaded sleeve joint |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2731065Y (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101696621B (en) * | 2009-11-04 | 2012-05-16 | 天津钢管集团股份有限公司 | Air-tight seal screw joint |
| CN102567591A (en) * | 2012-02-07 | 2012-07-11 | 中国石油天然气集团公司 | Modeling method for threaded joint of oil casing |
| CN101021147B (en) * | 2006-02-15 | 2013-06-26 | 希德卡公司 | Sucker rod connection with improved fatigue resistance |
| CN104153718A (en) * | 2014-07-22 | 2014-11-19 | 中国海洋石油总公司 | BHC quick sleeve threaded joint |
| CN104895508A (en) * | 2015-06-29 | 2015-09-09 | 东营市永利精工石油机械制造有限公司 | Special threaded connector for HTHP oil-gas well |
| CN108301786A (en) * | 2018-04-11 | 2018-07-20 | 张祖林 | A kind of special thread buckle joint |
-
2004
- 2004-05-21 CN CN 200420059633 patent/CN2731065Y/en not_active Expired - Lifetime
Cited By (10)
| 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 |
| CN101696621B (en) * | 2009-11-04 | 2012-05-16 | 天津钢管集团股份有限公司 | Air-tight seal screw joint |
| CN102567591A (en) * | 2012-02-07 | 2012-07-11 | 中国石油天然气集团公司 | Modeling method for threaded joint of oil casing |
| CN102567591B (en) * | 2012-02-07 | 2014-05-14 | 中国石油天然气集团公司 | Modeling method for threaded joint of oil casing |
| CN104153718A (en) * | 2014-07-22 | 2014-11-19 | 中国海洋石油总公司 | BHC quick sleeve threaded joint |
| CN104153718B (en) * | 2014-07-22 | 2016-07-06 | 中国海洋石油总公司 | The quick casing thread connection of BHC |
| CN104895508A (en) * | 2015-06-29 | 2015-09-09 | 东营市永利精工石油机械制造有限公司 | Special threaded connector for HTHP oil-gas well |
| CN104895508B (en) * | 2015-06-29 | 2017-05-31 | 东营市永利精工石油机械制造有限公司 | HTHP Oil/gas Well Special threading connectors |
| CN108301786A (en) * | 2018-04-11 | 2018-07-20 | 张祖林 | A kind of special thread buckle joint |
| CN108301786B (en) * | 2018-04-11 | 2024-04-19 | 张祖林 | Special thread-locking joint |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20140521 Granted publication date: 20051005 |