CN205314940U - Be used for airtight special screwed joint structure on sheathed tube doublestage screw thread - Google Patents
Be used for airtight special screwed joint structure on sheathed tube doublestage screw thread Download PDFInfo
- Publication number
- CN205314940U CN205314940U CN201521064140.1U CN201521064140U CN205314940U CN 205314940 U CN205314940 U CN 205314940U CN 201521064140 U CN201521064140 U CN 201521064140U CN 205314940 U CN205314940 U CN 205314940U
- Authority
- CN
- China
- Prior art keywords
- female
- sections
- public
- male
- tapering
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
Abstract
The utility model provides a be used for airtight special screwed joint structure on sheathed tube doublestage screw thread, the public hand ladle of this structure is drawn together: circular bead in the moment of torsion circular bead in the middle of tapered male thread and the two sections male thread, the public inside seal face of male thread tip, public inside seal vertex of surface department public is taken to public external seal face, two sections. Female hand ladle is drawn together: tapered box thread and the moment of torsion circular bead of two sections box thread centres, female inside seal face of box thread tip are taken to female outer circular bead, female external seal face, two sections. Take tapered male thread and box thread to twist to connect each other and be in the same place for two sections, the mutual opposite vertex of public female circular bead at two sections screw thread middle parts, public sealed face, female facial features mutual connection that seals touch. The beneficial effects are that adopt this structure to do certain preliminary treatment through the inside and outside sealed face to public, female is tapered, the inside and outside sealed face contact length of going up after detaining improves at double, has optimized the sealability that connects.
Description
Technical field
This utility model relates to a kind of twin-stage screw connection structure, is a kind of twin-stage screw thread air-sealed special threaded joint design for sleeve pipe.
Background technology
Tubing and casing tubing string adopts screw thread to be formed by connecting by single oil well pipe, and the screw connection point of tubing string is weak key link. In general API standard, sleeve pipe adopts round thread or buttress thread type of attachment. The advantage of this joint is that technology maturation, production cost are relatively low, and shortcoming is that screw thread should undertake linkage function and undertakes sealing function again, and joint stress concentration phenomenon is serious.
Development along with petroleum industry, especially the exploitation of deep-well, ultradeep well, high-pressure gas well, directional well, sour environment well, the serviceability of petroleum casing pipe is had higher requirement, the sleeve pipe with the threaded form of API standard is susceptible to the actual effect of the forms such as fracture, slippage, leakage in complex hole condition, brings huge loss to oil field. Thus, various Special threading connector is occurred in that. Wherein twin-stage nipple is as a kind of novel joint, is accepted by oil field user gradually. Twin-stage screw thread is that two sections of screw threads add middle part shoulder composition, and the torque shoulder in the middle part of when twist-on realizes top, two sections of screw-threaded engagement. There are two sealing surfaces at the two ends being typically in joint, and the two sealing surface realizes sealing by the form of metal interference.
China Patent No. is ZL96120151.7, discloses a kind of threaded joint for tubes, and male and female end is all processed at pipe end, thread forms is twin-stage screw thread, two seal form, for boring cone metal sealing, are positioned at the two ends of screw thread, and the middle part of two sections of screw threads is right angle torque shoulder.
China Patent No. is ZL00102261.X, discloses a kind of integral joint connecting two pipes, and adopting thread forms is twin-stage screw thread, and right angle shoulder is positioned at the middle of two sections of screw threads, and the two ends of screw thread are two sealing surfaces, have undercut near sealing surface.
Twin-stage screw thread adds the form of double-sealing face and has many good qualities, as: twin-stage screw thread is faster than single-stage screw thread make-up speed; The double-sealing face interference seal form by metal-metal, can guarantee that when being subject to intrinsic pressure and external pressure, stops gas to enter inside joint; Additionally twin-stage screw thread is typically in integral joint to apply, and this form not needing box cupling connection can provide bigger annular clearance, it is adaptable to the operation of slim-hole.
But two above patent is all not directed to the taper fit problem of male and female sealing surface. Twin-stage screw thread is due to the construction features of self, after twist-on, the sealing surface at screw thread two ends can produce the trend separated, when being subject to intrinsic pressure or outer compressive load, this separation trend can cause that sealing surface contact length is too short, thus being susceptible to intrinsic pressure or external pressure leakage.
Summary of the invention
For the deficiency in structure in prior art, the purpose of this utility model is to provide the twin-stage screw thread air-sealed special threaded joint design of a kind of sleeve pipe, with the problem solving the inside and outside sealing surface of half straight-connecting sleeve pipe of the twin-stage screw thread existence separation trend after twist-on, can guarantee that the sealability that this joint is excellent under inside and outside pressure effect, thus reaching to optimize the purpose of bipolar screw thread air-tight seal screw joint structure.
For achieving the above object, the technical solution adopted in the utility model is to provide a kind of twin-stage screw thread air-sealed special threaded joint design for sleeve pipe, this structure includes the female end processed in the male end of cannula tip and box cupling or cannula tip, wherein: described male end includes: torque shoulder in the middle of public external seal face, two sections of male threads with tapering and two sections of male threads, the public inner sealing surface of male thread end, public inner sealing surface apex public in shoulder; Described female end includes: female inner sealing surface of female outer shoulder, female external seal face, two sections of box threads with tapering and the torque shoulder of two sections of box threads centres, box thread end; Described two sections of male threads with tapering are together with the mutual twist-on of box thread, and the male and female shoulder of two sections of threaded middle is mutually to top, and male inner sealing surface contacts with each other with female external seal face with female inner sealing surface, male external seal face; The inside and outside sealing surface of described public affairs is all the conical surface, and the inside and outside sealing surface of described mother is all the conical surface; Described public inner sealing surface is 1:N+a relative to the tapering of casing axis, and female inner sealing surface is 1:N-a relative to the tapering of casing axis; Described public external seal face is 1:M-b relative to the tapering of casing axis, and female external seal face is 1:M+b relative to the tapering of casing axis; When N≤4.0,0.05≤a≤0.3; When 4.0 < N≤6.0,0.15≤a≤0.4; As N > 6,0.25≤a≤0.5, when M≤4.0,0.05≤b≤0.3; When 4.0 < M≤6.0,0.15≤b≤0.4; As M > 6,0.25≤b≤0.5;
Wherein N and M is greater than the real number of 0, represents tapering.
Effect of the present utility model is by the inside and outside sealing surface tapering of male and female is done certain pretreatment, optimizes the sealability of joint.
For 193.68*12.7mm specification, in all identical situations of other all joint dimensions such as screw thread, shoulder, the sealing surface magnitude of interference, model 1 and model 2 are only different on the tapering of inside and outside sealing surface, by FEM calculation, on it, the inside and outside sealing surface contact length after button differs greatly.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of twin-stage screw thread air-sealed special threaded joint design of the present utility model;
When Fig. 2 twin-stage screw thread air-tight seal screw joint male and female inner sealing surface tapering is identical, the schematic diagram of sealing place in after after twist-on;
When Fig. 3 twin-stage screw thread air-tight seal screw joint male and female external seal face cone degree is identical, the schematic diagram at external seal place after after twist-on.
Detailed description of the invention
In conjunction with accompanying drawing, the twin-stage screw thread air-sealed special threaded joint design for sleeve pipe of the present utility model is illustrated.
Twin-stage screw thread air-sealed special threaded joint design for sleeve pipe of the present utility model is achieved in that
This structure includes the female end 2 processing male end 1 and box cupling or cannula tip in cannula tip. Described sleeve pipe male end 1 includes public external seal face 5, first paragraph screw thread 3, middle part torque shoulder 9, second segment screw thread 4, public inner sealing surface 7, public interior shoulder 8. Described female end 2 includes the outer shoulder 6 of mother, female external seal face 5 ', first paragraph screw thread 3 ', middle part torque shoulder 9 ', second segment screw thread 4 ', female inner sealing surface 7 '. First paragraph screw thread male thread 3 and the engagement of first paragraph box thread 3 ', second segment male thread 4 and the engagement of second segment box thread 4 ', middle part torque shoulder 9 and 9 ' is to top, and male external seal face 5 and female external seal face 5 ' contact with each other, and male inner sealing surface 7 and female inner sealing surface 7 ' contact with each other. Inside and outside sealing surface realizes sealability by certain radial interference amount, and this inside and outside sealing surface is all the conical surface.
Due to the construction features of bipolar screw thread self, after twist-on, the inside and outside sealing surface at two ends can produce the trend separated, and causes the contact length contact length much smaller than the male and female sealing surface of design of actual male and female sealing surface. As shown in Figures 2 and 3, when male inner sealing surface is identical with the tapering of female inner sealing surface, male external seal face is identical with the tapering in female external seal face. Owing to top, the inner sealing surface at screw thread two ends and external seal face are only contacted by middle part torque shoulder in local, sealing cone has the trend of opening. When being subject to intrinsic pressure or outer compressive load at joint, owing to sealing surface contact length is too short or sealing surface contact pressure not enough, gas is easily entered by gap S and leaks. In order to ensure inside and outside means of press seals ability, it is necessary to prevent the separation trend of inside and outside sealing surface.
Pretreatment is as follows: the tapering of the male and female sealing surface contacted with each other differs, and all with to separate the trend of splitting contrary. If the basic tapering that 1:N is inner sealing surface, then public inner sealing surface is 1:N+a relative to the tapering of casing axis, and female inner sealing surface is 1:N-a relative to the tapering of casing axis; Public external seal face is 1:M-b relative to the tapering of casing axis, and female external seal face is 1:M+b relative to the tapering of casing axis. Wherein when N≤4.0,0.05≤a≤0.3; When 4.0 < N≤6.0,0.15≤a≤0.4; As N > 6,0.25≤a≤0.5. When M≤4.0,0.05≤b≤0.3; When 4.0 < M≤6.0,0.15≤b≤0.4; As M > 6,0.25≤b≤0.5.
Wherein N and M is greater than the real number of 0, represents tapering, and N and M can identical can also differ.
Such as: as the basic tapering N=3 of inner sealing surface, a=0.1, public inner sealing surface tapering 1:3.1, female inner sealing surface tapering 1:2.9, result according to FEM calculation, when this cooperation, time joint is subject to inner pressuring load, it is more reasonable that the male and female of inner sealing surface seals contact length.
Public external seal face is 1:M-b relative to the tapering of casing axis, and female external seal face is 1:M+b relative to the tapering of casing axis. When M≤4.0,0.05≤b≤0.3; When 4.0 < M≤6.0,0.15≤b≤0.4;As M > 6,0.25≤b≤0.5. It is appreciated that the value of b suitably increases along with the increase of M value by finite element analysis, such inner pressuring sealing best results. Such as: as the basic tapering M=6 of inner sealing surface, a=0.2, public inner sealing surface tapering 1:5.8, female inner sealing surface tapering 1:6.2, result according to FEM calculation, when this cooperation, time joint is subject to outer compressive load, it is more reasonable that the male and female in external seal face seals contact length.
If female end is processed on casing pipe, then the expanding amount of described female end body is less than casing pipe external diameter 3.5%.
The torque shoulder of described two sections of male and female threaded middle with tapering is right angle torque shoulder, and described two sections of torque shoulder of male and female threaded middle with tapering and the angle of axis are 75 degree. The flute profile of described two sections of male and female screw threads with tapering is barb-shaped screw thread, and according to different external diameters and wall thickness, the pitch scope of corresponding screw thread is 8 teeth/inch～4 tooth/inch, and the scope of corresponding tooth depth is 0.8mm～1.6mm, and thread taper is 1:16.
The torque shoulder of two sections of threaded middle and the angle of axis are 75～90 degree, 75 torque shoulder can increase wedge-type seal effect, it is ensured that accurate twist-on positions.
Claims (5)
1. the twin-stage screw thread air-sealed special threaded joint design for sleeve pipe, this structure includes the female end processed in the male end of cannula tip and box cupling or cannula tip, it is characterized in that: described male end includes: torque shoulder in the middle of public external seal face, two sections of male threads with tapering and two sections of male threads, the public inner sealing surface of male thread end, public inner sealing surface apex public in shoulder; Described female end includes: female inner sealing surface of female outer shoulder, female external seal face, two sections of box threads with tapering and the torque shoulder of two sections of box threads centres, box thread end; Described two sections of male threads with tapering are together with the mutual twist-on of box thread, and the male and female shoulder of two sections of threaded middle is mutually to top, and male inner sealing surface contacts with each other with female external seal face with female inner sealing surface, male external seal face; The inside and outside sealing surface of described public affairs is all the conical surface, and the inside and outside sealing surface of described mother is all the conical surface; Described public inner sealing surface is 1:N+a relative to the tapering of casing axis, and female inner sealing surface is 1:N-a relative to the tapering of casing axis; Described public external seal face is 1:M-b relative to the tapering of casing axis, and female external seal face is 1:M+b relative to the tapering of casing axis; When N≤4.0,0.05≤a≤0.3; When 4.0 < N≤6.0,0.15≤a≤0.4; As N > 6,0.25≤a≤0.5, when M≤4.0,0.05≤b≤0.3; When 4.0 < M≤6.0,0.15≤b≤0.4; As M > 6,0.25≤b≤0.5;
Wherein N and M is greater than the real number of 0, represents tapering.
2. twin-stage screw thread air-sealed special threaded joint design according to claim 1, is characterized in that: if female end is processed on casing pipe, then the expanding amount of described female end body is less than casing pipe external diameter 3.5%.
3. twin-stage screw thread air-sealed special threaded joint design according to claim 1, is characterized in that: the torque shoulder of described two sections of male and female threaded middle with tapering is right angle torque shoulder.
4. twin-stage screw thread air-sealed special threaded joint design according to claim 1, is characterized in that: described two sections of torque shoulder of male and female threaded middle with tapering and the angle of axis are 75 degree.
5. twin-stage screw thread air-sealed special threaded joint design according to claim 1, it is characterized in that: the flute profile of described two sections of male and female screw threads with tapering is barb-shaped screw thread, according to different external diameters and wall thickness, the pitch scope of corresponding screw thread is 8 teeth/inch～4 tooth/inch, the scope of corresponding tooth depth is 0.8mm～1.6mm, and thread taper is 1:16.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521064140.1U CN205314940U (en) | 2015-12-16 | 2015-12-16 | Be used for airtight special screwed joint structure on sheathed tube doublestage screw thread |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521064140.1U CN205314940U (en) | 2015-12-16 | 2015-12-16 | Be used for airtight special screwed joint structure on sheathed tube doublestage screw thread |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205314940U true CN205314940U (en) | 2016-06-15 |
Family
ID=56186634
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201521064140.1U Active CN205314940U (en) | 2015-12-16 | 2015-12-16 | Be used for airtight special screwed joint structure on sheathed tube doublestage screw thread |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205314940U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105401891A (en) * | 2015-12-16 | 2016-03-16 | 天津钢管集团股份有限公司 | Double-stage thread air-tight seal special thread joint structure for casing pipe |
| CN107795286A (en) * | 2017-11-21 | 2018-03-13 | 西南石油大学 | A kind of direct linkage type tubing and casing multistage air-tight structure |
| CN111058780A (en) * | 2018-10-16 | 2020-04-24 | 宝山钢铁股份有限公司 | Airtight seal sleeve |
-
2015
- 2015-12-16 CN CN201521064140.1U patent/CN205314940U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105401891A (en) * | 2015-12-16 | 2016-03-16 | 天津钢管集团股份有限公司 | Double-stage thread air-tight seal special thread joint structure for casing pipe |
| CN107795286A (en) * | 2017-11-21 | 2018-03-13 | 西南石油大学 | A kind of direct linkage type tubing and casing multistage air-tight structure |
| CN111058780A (en) * | 2018-10-16 | 2020-04-24 | 宝山钢铁股份有限公司 | Airtight seal sleeve |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105401891A (en) | Double-stage thread air-tight seal special thread joint structure for casing pipe | |
| CN203531777U (en) | High-quality airtight seal oil casing threaded joint | |
| CN205314940U (en) | Be used for airtight special screwed joint structure on sheathed tube doublestage screw thread | |
| CN202380985U (en) | Tubular air seal thread joint | |
| CN201723179U (en) | Air-tight oil casing nipple | |
| CN201322148Y (en) | High performance oil pipe hermetic seal threaded connection structure | |
| CN202689965U (en) | Air-tight seal oil pipe threaded joint applied to high-temperature and high-pressure gas well | |
| CN104563904B (en) | Sealing connecting structure of casing of gas well | |
| CN200992958Y (en) | Dual shoulder anti-torsion joint | |
| CN203925326U (en) | The antitorque high pressure sealing drilling rod joint of height for oil gas drilling | |
| CN101899953A (en) | Thread joint structure for high-performance oil casing | |
| CN202090850U (en) | Pipeline connecting piece between thread and conical seal surface with limited circular bead | |
| CN202673178U (en) | High-sealing buttress threaded conduit connecting joint | |
| CN204960827U (en) | Oil drilling is with airtight tool joint of little external diameter high strength | |
| CN104018788A (en) | Drill rod joint with thread profiles | |
| CN201574696U (en) | Large-caliber fast screwing-up sleeve thread connecting structure | |
| CN203403832U (en) | Air-tight seal screwed joint | |
| CN206329284U (en) | A kind of dual hermetic seal special buckle oil pipe of metallic elastic | |
| CN210918913U (en) | High-torsion-resistance air-tight seal oil casing threaded joint | |
| CN107448154A (en) | A kind of air-tight seal screw joint | |
| CN201265370Y (en) | Gas-tight drill rod connector | |
| CN203531780U (en) | Highly-resistant double-circular-bead oil sleeve joint | |
| CN203188922U (en) | Hermetic seal buckle profile | |
| CN102852468B (en) | High-sealing special circular thread oil sleeve connection connector | |
| CN102996079A (en) | Tubular air sealing screwed joint and application thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20190625 Address after: No. 396 Jintang Highway, Dongli District, Tianjin 300301 Patentee after: Tianjin Steel Tube Manufacturing Co., Ltd. Address before: No. 396 Jintang Highway, Dongli District, Tianjin 300301 Patentee before: Tianjin Steel Pipe Group Co., Ltd. |