CN206111106U - Special screwed joint connects structure for be used for titanium alloy oil well pipe - Google Patents
Special screwed joint connects structure for be used for titanium alloy oil well pipe Download PDFInfo
- Publication number
- CN206111106U CN206111106U CN201621044117.0U CN201621044117U CN206111106U CN 206111106 U CN206111106 U CN 206111106U CN 201621044117 U CN201621044117 U CN 201621044117U CN 206111106 U CN206111106 U CN 206111106U
- Authority
- CN
- China
- Prior art keywords
- oil well
- sealing surface
- titanium alloy
- female
- well pipe
- 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.)
- Withdrawn - After Issue
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Abstract
The utility model aims at providing a special screwed joint connects structure for be used for titanium alloy oil well pipe fits, the public sealed face of this structure adopts the form of cambered surface, the form of female sealed face adoption conical surface, the sealability is realized through interference fit to public female sealed face, the cambered surface profound height (img file='DDA0001111602080000011. TIF'wi='54'he='48' /) the decision of the sectional view that the magnitude of interference of the conical surface formed after by cambered surface and conical surface interference, in order to solve the problem that API screw thread and conventional special screw thread are not suitable for titanium alloy material. The beneficial effects are that this joint design is according to the international standard API5B's of oil well pipe requirement, that the oil well pipe is broken out and do not take place the thread gluing on need satisfying many times: the thread gluing does not take place for satisfied 2 times for the sleeve pipe, and oil pipe does not take place the thread gluing satisfied 9 times. Because titanium alloy material's superficial hardness is low, wear resistance is poor, adopt the cambered surface can this kind of risk, cambered surface just be avoided to the sealed form of the conical surface the sealed form of the conical surface, sealed surface contact pressure distributes on average, is the small hill form.
Description
Technical field
This utility model is related to a kind of Special threading connector attachment structure for titanium alloy oil well pipe.
Background technology
Petroleum gas occupies extremely important strategic position in world energy sources or even whole economic field, along with generation
Boundary's economy fast-developing and energy demand is continuously increased, the exploration and development dynamics of petroleum gas also constantly plus
Greatly.With the more sophisticated of geologic structure and being continuously increased for drilling depth, the temperature and pressure of fluid is raised, and sulfur content increases
Plus, it is more strict for the material and technical requirements of oil well pipe.Titanium alloy has high specific strength, high ratio modulus, corrosion-resistant etc.
Number of advantages, its effect is more and more obvious with advantage.The need of high intensity, especially corrosion resistant titanium alloy, titanium alloy oil well pipe
Ask more and more, so the Special threading connector attachment structure designed and developed suitable for titanium alloy oil well pipe is highly desirable to.
It is very sensitive to stress concentration because titanium alloy surface hardness is low, anti-wear performance is poor, elastic modelling quantity is low.The conventional conical surface-conical surface
Sealing surface form and the magnitude of interference design after twist-on, regional area sealing surface contact pressure is very big, is very easy to occur viscous
Detain so as to cause the failure of sealing surface.
China Patent No. is ZL201310085604.6, discloses a kind of production method of titanium alloy oil well pipe, the method
Carry out the manufacture of titanium alloy seamless pipe by the way of tandem rolling first, breach traditional hot extrusion and the restriction of cold-rolling process, with
And with respect to other techniques such as hot extrusions, lumber recovery is higher, up to more than 85%.
China Patent No. is ZL201210377714.5, discloses a kind of titanium alloy oil well of the corrosion-resistant environment of high-strength and high ductility
Pipe and its manufacture method, the method can guarantee that its yield strength meets 110ksi requirements, and impact flexibility is good, and with good
Anti- H2S、CO2The performance of corrosion.
But two above patent is not directed to be applied to the nipple of titanium alloy material, due to titanium alloy material
Own characteristic and use environment, existing API screw threads and conventional special thread are not applied to.Therefore, exploitation is applied to titanium alloy
The Special threading connector attachment structure of pipe for oil well use becomes the technical problem for being badly in need of solving.
The content of the invention
The purpose of this utility model is to provide a kind of Special threading connector attachment structure for titanium alloy oil well pipe, with
Solve the problems, such as that API screw threads and conventional special thread are not suitable for titanium alloy material.
For achieving the above object, the technical solution adopted in the utility model is to provide a kind of titanium alloy oil well pipe of being exclusively used in
Air-sealed special threaded joint design, the structure includes the male end of oil well pipe, includes the male thread with taper, male thread end
The public shoulder of the public sealing surface in portion and public sealing surface apex, also includes the mother of the male end symmetrical structure box cupling of oil well pipe
End, includes the female shoulder composition behind the box thread with taper, female sealing surface of box thread end and female sealing surface, described
Together with the mutual twist-on of box thread, male sealing surface, female sealing surface contact with each other male thread；It is characterized in that：Public sealing surface is adopted
The form of cambered surface, in the form of the conical surface, male and female sealing surface realizes sealability, cambered surface-cone to female sealing surface by interference fit
The magnitude of interference in face by the profile formed after cambered surface and adopting conical surface interference profound heightDetermine,Scope be：
Wherein
In formula：P --- the maximum contact pressure of public affairs sealing, D --- outer tube diameter, d --- internal diameter of tube body, W --- box cupling
External diameter, σs--- material yield strength, k --- material coefficient.
Effect of the present utility model is the gentle sealability of anti-galling ability of the joint that can guarantee that titanium alloy oil well pipe.Adopt
With the seal form of cambered surface-conical surface, sealing surface contact pressure can be greatly lowered, stress concentration be reduced, in making for actual well site
With in, the joint of titanium alloy oil well pipe can guarantee that 9 upper shackle twist-ons do not occur thread gluing, exceed in 4 times of API 5B regulations
Shackle not thread gluing.In addition the rational sealing surface magnitude of interference can ensure that the excellent hermetic seal ability of joint.The hermetic seal of joint
Ability is suitable with yield pressure in body.In the composite force evaluation tests of ISO 13679 are carried out, the joint energy of titanium alloy oil well pipe
By the evaluation test of A systems, i.e. joint bearing 14 points of load on 100% body equivalent stress curve, including stretching+interior
, there is no any leakage, so as to ensure the structural intergrity of joint in pressure, compression+intrinsic pressure, compression+external pressure, stretching+external pressure.
Description of the drawings
Fig. 1 is the schematic diagram of the Special threading connector attachment structure suitable for titanium alloy oil well pipe of the present utility model；
Fig. 2 is the hermetic unit of the Special threading connector attachment structure suitable for titanium alloy oil well pipe of the present utility model
Enlarged diagram.
In figure：
A, male end B, female end C, male thread E, box thread F, male sealing surface G, female sealing surface H, male shoulder J, female platform
Shoulder W, box cupling outer diameter D, outer tube diameter d, internal diameter of tube body
Δ l, cambered surface-conical surface the magnitude of interference by the profile formed after cambered surface and adopting conical surface interference profound height
The angle of R, the arc radius θ of male sealing surface, female sealing surface and axis
The angle of the vertical line of α, male and female shoulder and the axis of thread
Specific embodiment
The air-sealed special threaded joint design for sleeve pipe of the present utility model is illustrated with reference to accompanying drawing.
As shown in figure 1, the Special threading connector attachment structure for titanium alloy oil well pipe of the present utility model includes public affairs
End A and female end B two parts composition, described sleeve pipe male end A is constituted by male thread C and containing public sealing surface F and public shoulder H parts,
The box cupling part B connects between two sleeve pipes, both sides symmetrical configuration, including box thread E and mother corresponding with male sealing surface it is close
Front cover G and female shoulder J.The external diameter of body is D, and internal diameter of tube body is d, and box cupling external diameter is W.
As shown in Fig. 2 the public sealing surface F be cambered surface, arc radius are R, female sealing surface G be the conical surface, the conical surface with
The angle of axis is θ, and the dash area that interference is formed after the cooperation of male and female sealing surface is the magnitude of interference of cambered surface-conical surface by cambered surface and cone
The profound height of the profile formed after the interference of face
Scope be：
Wherein
In formula：P --- the maximum contact pressure of public affairs sealing, D --- outer tube diameter, d --- internal diameter of tube body, W --- box cupling
External diameter, σs--- material yield strength, k --- material coefficient
What the Special threading connector attachment structure for titanium alloy oil well pipe of the present utility model was realized in：
Titanium alloy oil pipe specification is as follows：External diameter is 88.9mm, and wall thickness is 7.34mm, grade of steel 110Ksi (yield strengths
758MPa), box cupling external diameter is 102mm, is calculated according to formula 1 and is understood,That is the interference of sealing surface design is maximum
Value at position is no more than 0.38mm.Screw thread is hook type helical burr, taper 1:16,6 teeth of pitch/inch, the high 1mm of male thread tooth,
The high 1.1mm of female tooth.Yield pressure is 109.5MPa in body, and body tensile yield strength is 1425KN；It is interior that joint can guarantee that
Compressive Strength is 109.5MPa, and the tensile yield strength that joint can guarantee that is 1425KN, suitable with body.
Sleeve pipe specification is as follows：Titanium alloy sleeve pipe specification is as follows：External diameter is 177.8mm, and wall thickness is 9.19mm, grade of steel 95Ksi
(yield strength 655MPa), box cupling external diameter is 200mm, is calculated according to formula 1 and is understood,That is sealing surface design
Interference maximum position at value no more than 0.75mm.Screw thread is hook type helical burr, taper 1:16,5 teeth of pitch/inch, public spiral shell
The high 1.5mm of stricture of vagina tooth, the high 1.6mm of female tooth.Yield pressure is 59.2MPa in body, and body tensile yield strength is 3186KN；Joint
The internal pressure strength that can guarantee that is 59.2MPa, and the tensile yield strength that joint can guarantee that is 3186KN, suitable with body.
Claims (3)
1. a kind of air-sealed special threaded joint design for titanium alloy oil well pipe, the structure includes the male end of oil well pipe,
The public shoulder of the male thread with taper, the public sealing surface of male thread end and public sealing surface apex is included, is also included
The female end of the male end symmetrical structure box cupling of oil well pipe, include the box thread with taper, female sealing surface of box thread end and
Female shoulder composition behind female sealing surface, the male thread together with the mutual twist-on of box thread, male sealing surface, female sealing surface phase
Mutually contact；It is characterized in that：In the form of cambered surface, in the form of the conical surface, male and female sealing surface passes through female sealing surface public sealing surface
Interference fit realizes sealability, the magnitude of interference of cambered surface-conical surface by the profile formed after cambered surface and adopting conical surface interference profound height
Determine,Scope be：
WhereinK=6.67 × 10-4
In formula：P --- the maximum contact pressure of public affairs sealing, D --- outer tube diameter, d --- internal diameter of tube body, W --- box cupling external diameter,
σs--- material yield strength, k --- material coefficient.
2. it is used for the air-sealed special threaded joint design of titanium alloy oil well pipe according to claim 1, it is characterized in that：It is described
Female sealing surface of air-sealed special threaded joint and the angle theta scope of body axis are 3～10 °, the male and female shoulder and body
The angle α of the vertical line of axis is -15～-20 °.
3. it is used for the air-sealed special threaded joint design of titanium alloy oil well pipe according to claim 1, it is characterized in that：It is described
The flute profile of air-sealed special threaded joint is hook screw thread, and the pitch of flute profile is per inch 8-4 teeth, and taper is 1：16, male thread
A height of 0.9mm～the 1.7mm of tooth, a height of 1.0mm～1.8mm of box thread tooth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621044117.0U CN206111106U (en) | 2016-09-08 | 2016-09-08 | Special screwed joint connects structure for be used for titanium alloy oil well pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621044117.0U CN206111106U (en) | 2016-09-08 | 2016-09-08 | Special screwed joint connects structure for be used for titanium alloy oil well pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206111106U true CN206111106U (en) | 2017-04-19 |
Family
ID=58518960
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621044117.0U Withdrawn - After Issue CN206111106U (en) | 2016-09-08 | 2016-09-08 | Special screwed joint connects structure for be used for titanium alloy oil well pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206111106U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106168122A (en) * | 2016-09-08 | 2016-11-30 | 天津钢管集团股份有限公司 | Special threading connector attachment structure for titanium alloy oil well pipe |
| CN109736724A (en) * | 2019-02-18 | 2019-05-10 | 天津钢管集团股份有限公司 | Aluminium alloy tubing and casing air-sealed special threaded joint structure |
-
2016
- 2016-09-08 CN CN201621044117.0U patent/CN206111106U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106168122A (en) * | 2016-09-08 | 2016-11-30 | 天津钢管集团股份有限公司 | Special threading connector attachment structure for titanium alloy oil well pipe |
| CN106168122B (en) * | 2016-09-08 | 2018-07-06 | 天津钢管集团股份有限公司 | For the Special threading connector connection structure of titanium alloy oil well pipe |
| CN109736724A (en) * | 2019-02-18 | 2019-05-10 | 天津钢管集团股份有限公司 | Aluminium alloy tubing and casing air-sealed special threaded joint structure |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20170419 Effective date of abandoning: 20180706 |
|
| AV01 | Patent right actively abandoned |