CN206753506U - A kind of high-pressure gas well nipple - Google Patents
A kind of high-pressure gas well nipple Download PDFInfo
- Publication number
- CN206753506U CN206753506U CN201720139329.5U CN201720139329U CN206753506U CN 206753506 U CN206753506 U CN 206753506U CN 201720139329 U CN201720139329 U CN 201720139329U CN 206753506 U CN206753506 U CN 206753506U
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- Prior art keywords
- sealing
- face
- box cupling
- conical surface
- thread
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Abstract
A kind of nipple is the utility model is related to, specifically a kind of high-pressure gas well nipple, belongs to nipple technical field.It includes box cupling and body, and body is provided with seal face close to box cupling one end, and end-blocking face and torque shoulder form axial interference fit；Sealing inner conical surface is provided between the internal thread and torque shoulder of box cupling, body is provided with sealing male cone (strobilus masculinus) close to box cupling one end, and sealing inner conical surface and sealing male cone (strobilus masculinus) form radial interference fit；Transition sphere is provided between the internal thread and torque shoulder of box cupling, the face of cylinder is provided between the external screw thread and seal face of body, thread compound holding tank is formed between transition sphere and the face of cylinder.The utility model is provided with main seal structure, i.e., inside and outside conical surface sealing structure, is additionally provided with auxiliary sealing structure, shoulder sealing structure, improves sealing property；Meanwhile thread compound holding tank is also provided with, protect the contact stress on primary sealing area not influenceed by thread compound.
Description
Technical field
A kind of nipple is the utility model is related to, specifically a kind of high-pressure gas well nipple, belongs to screw thread
Joint technique field.
Background technology
Oil, sleeve pipe are oil country tubular goods necessary to exploitation oil and natural gas, and hundreds of oil, sleeve pipes are connect by screw thread
Head connects, and forms a variety of load effects such as tubing string, tubing string Tensile, compression, internal pressure, external pressure of a few km length, and joint is
The weak link of whole tubing string, it is easy to leakage failure occurs.
At present, the joint that oil, sleeve pipe use is typically API joints.API joints are a kind of modular connections, by API standard plus
Work and manufacture.Its shortcoming is that sealing property especially gas sealing ability is poor, it is impossible to be used in the exploitation of scaled high-pressure natural gas well.
Find by prior art documents, Chinese patent Authorization Notice No. is the B of CN 101696621, is authorized public
Announcement day is on May 16th, 2012, and patent of invention is entitled " air-tight seal screw joint ", and the patent is carried out to above-mentioned API screw threads
Improve.Joint includes the box thread of box cupling and the male thread of tube end, wherein：Box thread is made up of buttress thread,
Right angle torque shoulder is provided with front of buttress thread, energy is provided with wherein on the position of a tooth in the 4th~7 pitch thread of box thread
The projecting thread part of high pressure gas leakage is prevented, so as to play sealing function.The The effect of invention be by block oil pipe and
The male thread and box thread of sleeve pipe screw coordinate after leakage path existing for tooth top and bottom of the tooth, serve sealing function.With API
Joint is compared, and above-mentioned patent has blocked male thread and box thread and revolved due to devising connection screw thread and projecting thread two parts
Leakage path existing for tooth top and bottom of the tooth after tight fit, therefore sealing function can be played.Its weak point is：1）Projecting thread
It is not easy to detect and processes.2）Serious stress concentration is locally lain in engagement screw thread.
The content of the invention
In place of the purpose of this utility model is to overcome above-mentioned deficiency, so as to provide a kind of high-pressure gas well nipple,
By increasing radial seal structure and torque shoulder come plug leak passage, while fat holding tank is threaded, prevented excessive
Thread compound influences the contact stress on the conical surface.
According to technical scheme provided by the utility model, a kind of high-pressure gas well nipple includes box cupling and body, pipe
Body is provided with external screw thread, and box cupling medial center is provided with torque shoulder, the symmetrical internal thread in the torque shoulder left and right sides, body and box cupling
Linked into an integrated entity by external screw thread and internal thread, it is characterized in that：Body is provided with seal face close to box cupling one end, blocks face and torsion
Square shoulder forms axial interference fit；Sealing inner conical surface is provided between the internal thread and torque shoulder of box cupling, body is close to box cupling
One end is provided with sealing male cone (strobilus masculinus), and sealing inner conical surface and sealing male cone (strobilus masculinus) form radial interference fit；The internal thread and moment of torsion of box cupling
Transition sphere is provided between shoulder, is provided with the face of cylinder between the external screw thread and seal face of body, transition sphere and the face of cylinder it
Between formed thread compound holding tank.
Further, the angle of torque shoulder, seal face and vertical line is α, and α scope is 15 ~ 20o.
Further, seal face and torque shoulder formed the magnitude of interference scope that is axially interference fitted for 0.02~
0.05mm。
Further, the cone angle for sealing inner conical surface and sealing male cone (strobilus masculinus) is β, and β scope is 20 ~ 30o.
Further, seal inner conical surface and seal male cone (strobilus masculinus) formed the magnitude of interference scope of radial interference fit for 0.6~
0.8mm。
Further, the width range of thread compound holding tank is 1.5~2.0mm, and the radius of transition sphere is 20mm.
Further, First Transition fillet is provided between the sealing inner conical surface of box cupling and torque shoulder, outside the sealing of body
The second knuckle is provided between the conical surface and seal face, First Transition fillet is less than the second knuckle.
Further, the total length of transition sphere and sealing inner conical surface is L1, the face of cylinder and sealing male cone (strobilus masculinus) total length
For L2, and L2=L1+1.5mm.
Further, the length for sealing inner conical surface is L3, and the length for sealing male cone (strobilus masculinus) is L4, and L3=L4+0.5mm.
Compared with the prior art the utility model has advantages below：
The utility model is simple in construction, compact, reasonable, there is provided main seal structure, i.e., inside and outside conical surface sealing structure, also sets
Auxiliary sealing structure is equipped with, shoulder sealing structure, improves sealing property；Meanwhile thread compound holding tank is also provided with, protection master
Contact stress on sealing surface is not influenceed by thread compound；Hermetic seal ability can reach 100% inboard wall of tube body yield pressure, fit
Conjunction uses under the harsh drilling condition such as scaled high-pressure natural gas well, hp-ht well.
Brief description of the drawings
Fig. 1 is the utility model front view.
Fig. 2 is structure chart at thread compound holding tank of the present utility model.
Description of reference numerals：1- box cuplings, 2- internal threads, 3- transition sphere, 4- sealing inner conical surface, 5- First Transitions fillet,
6- torque shoulders, 7- seal faces, the knuckles of 8- second, 9- sealings male cone (strobilus masculinus), the 10- faces of cylinder, 11- external screw threads, 12- pipes
Body, 13- thread compound holding tanks.
Embodiment
The utility model will be further described with reference to the embodiment in accompanying drawing below：
As shown in Figure 1 and 2, the utility model mainly includes box cupling 1 and body 12, and the medial center of box cupling 1 is provided with torque shoulder
6, the symmetrical internal thread 2 in the left and right sides of torque shoulder 6.Body 12 is provided with external screw thread 11, and body 12 and box cupling 1 pass through external screw thread 11
Linked into an integrated entity with internal thread 2.Body 12 is provided with seal face 7 close to the one end of box cupling 1, close after box cupling 1 and body 12 are tightened
End-blocking face 7 and torque shoulder 6 form axial interference fit.It is auxiliary sealing structure between seal face 7 and torque shoulder 6.
The angle of the torque shoulder 6, seal face 7 and vertical line is α, and α scope is 15 ~ 20o.The seal face 7
It is 0.02~0.05mm that the magnitude of interference scope being axially interference fitted is formed with torque shoulder 6.The basis for selecting of the magnitude of interference is contact
Stress on face is not higher than material yield strength.
Sealing inner conical surface 4 is provided between the internal thread 2 and torque shoulder 6 of box cupling 1, body 12 is provided with close to the one end of box cupling 1
Male cone (strobilus masculinus) 9 is sealed, after box cupling 1 and body 12 are tightened, sealing inner conical surface 4 and sealing male cone (strobilus masculinus) 9 form radial interference fit.It is close
Body seal mechanism is sealed between envelope inner conical surface 4 and sealing male cone (strobilus masculinus) 9.
The sealing inner conical surface 4 and the cone angle for sealing male cone (strobilus masculinus) 9 are β, and β scope is 20-30o.The sealing inner conical surface 4
The magnitude of interference scope that radial interference fit is formed with sealing male cone (strobilus masculinus) 9 is 0.6~0.8mm.The basis for selecting of the magnitude of interference is contact
Stress on face is not higher than material yield strength.
Transition sphere 3, the external screw thread 11 and seal face of body 12 are provided between the internal thread 2 and torque shoulder 6 of box cupling 1
The face of cylinder 10 is provided between 7, thread compound storage is formed after box cupling 1 and body 12 are tightened, between transition sphere 3 and the face of cylinder 10
Groove 13, the thread compound holding tank 13 can store unnecessary thread compound, prevent excessive thread compound from influenceing male cone (strobilus masculinus) in sealing
Between contact stress.
The width range of the thread compound holding tank 13 is 1.5~2.0mm, and the radius of transition sphere 3 is 20mm.
First Transition fillet 5, First Transition fillet 5 are provided between the sealing inner conical surface 4 and torque shoulder 6 of the box cupling 1
Radius be 0.5mm.The second knuckle 8, the second mistake are provided between the sealing male cone (strobilus masculinus) 9 and seal face 7 of the body 12
The radius for crossing fillet 8 is 0.8mm.First Transition fillet be less than the second knuckle be in order to reduce the two cooperation after formed should
Power is concentrated.
The total length of the transition sphere 3 and sealing inner conical surface 4 is L1, the face of cylinder 10 and sealing male cone (strobilus masculinus) 9 total length
For L2, and L2=L1+1.5mm.The length of the sealing inner conical surface 4 be L3, and the length for sealing male cone (strobilus masculinus) 9 is L4, and L3=L4+
0.5mm.In this way, purpose be ensure the two positions can proper engagement and be unlikely to interfere.
One embodiment of the present utility model is the oil pipe for Ф 88.9 × 7.34 mm, P110 grade of steels.Oil pipe body
Physical dimension include external diameter, wall thickness etc. and use API standard setting, tubing material meets API standard to P110 steel grade oils
The requirement of tube material, its internal thread (2) and external screw thread (11) are buttress thread, the high 1.22mm of internal thread tooth, external screw thread tooth
High 1.02mm, pitch 4.23mm, taper 1:16.Seal cone angle beta=30o of inner conical surface (4) and sealing male cone (strobilus masculinus) (9), torque shoulder
(6) and end face (7) and vertical line angle α=20o.The magnitude of interference of radial interference fit (14) is 0.65mm, axially interference fit
(15) the magnitude of interference is 0.02mm, and the width of thread compound holding tank (13) is 1.5mm, forms the transitional ball of thread compound holding tank
The radius in face (3) is 20mm.Fillet（5）, (8) radius be respectively R0.5 and R0.8.Transition sphere (3) and sealing inner conical surface
(4) 2=6.0mm of total length L of 1=4.5mm of total length L, the face of cylinder (10) and sealing male cone (strobilus masculinus) (9), sealing inner conical surface (4)
Length L3=1.45mm, length L4=0.95mm of sealing male cone (strobilus masculinus) (9).The hermetic seal drag of the joint up to 109.6MPa with
On.
Second embodiment of the present utility model is the sleeve pipe for Ф 177.8 × 10.36mm, Q125 grade of steels.Sleeve pipe pipe
The physical dimension of body includes external diameter, wall thickness etc. and uses API standard setting, and shell material meets API standard to Q125 grade of steels
The requirement of shell material,
Its internal thread (2) and external screw thread (11) are buttress thread, the high 1.775mm of internal thread tooth, and external screw thread tooth is high
1.575mm, pitch 5.08mm, taper 1:16.Seal cone angle beta=20o of inner conical surface (4) and sealing male cone (strobilus masculinus) (9), torque shoulder
(6) and end face (7) and vertical line angle α=15o.The magnitude of interference of radial interference fit (14) is 0.80mm, axially interference fit
(15) the magnitude of interference is 0.05mm, and the width of thread compound holding tank (13) is 2.0mm, forms the transitional ball of thread compound holding tank
The radius in face (3) is 20mm.Fillet（5）, (8) radius be respectively R0.5 and R0.8.Transition sphere (3) and sealing inner conical surface
(4) 2=12.5mm of total length L of 1=11.0mm of total length L, the face of cylinder (10) and sealing male cone (strobilus masculinus) (9), sealing inner conical surface (4)
Length L3=7.05mm, sealing male cone (strobilus masculinus) (9) length L4=6.55mm.The hermetic seal drag of the joint up to 87.9MPa with
On.
Claims (9)
1. a kind of high-pressure gas well nipple, box cupling（1）And body（12）, body（12）It is provided with external screw thread（11）, box cupling
（1）Medial center is provided with torque shoulder（6）, torque shoulder（6）The symmetrical internal thread in the left and right sides（2）, body（12）And box cupling（1）
Pass through external screw thread（11）And internal thread（2）Link into an integrated entity, it is characterized in that：Body（12）Close to box cupling（1）One end is provided with sealing
End face（7）, block face（7）And torque shoulder（6）Form axially interference fit；Box cupling（1）Internal thread（2）And torque shoulder
（6）Between be provided with sealing inner conical surface（4）, body（12）Close to box cupling（1）One end is provided with sealing male cone (strobilus masculinus)（9）, seal inner conical surface
（4）With sealing male cone (strobilus masculinus)（9）Form radial interference fit；Box cupling（1）Internal thread（2）And torque shoulder（6）Between be provided with
Cross sphere（3）, body（12）External screw thread（11）And seal face（7）Between be provided with the face of cylinder（10）, transition sphere（3）And circle
Cylinder（10）Between formed thread compound holding tank（13）.
2. a kind of high-pressure gas well nipple as claimed in claim 1, it is characterized in that：The torque shoulder（6）, sealed end
Face（7）Angle with vertical line is α, and α scope is 15 ~ 20o.
3. a kind of high-pressure gas well nipple as claimed in claim 1, it is characterized in that：The seal face（7）And moment of torsion
Shoulder（6）It is 0.02~0.05mm to form the magnitude of interference scope being axially interference fitted.
4. a kind of high-pressure gas well nipple as claimed in claim 1, it is characterized in that：The sealing inner conical surface（4）With it is close
Seal male cone (strobilus masculinus)（9）Cone angle be β, β scope is 20 ~ 30o.
5. a kind of high-pressure gas well nipple as claimed in claim 1, it is characterized in that：The sealing inner conical surface（4）With it is close
Seal male cone (strobilus masculinus)（9）The magnitude of interference scope for forming radial interference fit is 0.6~0.8mm.
6. a kind of high-pressure gas well nipple as claimed in claim 1, it is characterized in that：The thread compound holding tank（13）'s
Width range is 1.5~2.0mm, transition sphere（3）Radius be 20mm.
7. a kind of high-pressure gas well nipple as claimed in claim 1, it is characterized in that：The box cupling（1）Sealing inner cone
Face（4）And torque shoulder（6）Between be provided with First Transition fillet（5）, body（12）Sealing male cone (strobilus masculinus)（9）And seal face
（7）Between be provided with the second knuckle（8）, First Transition fillet（5）Less than the second knuckle（8）.
8. a kind of high-pressure gas well nipple as claimed in claim 1, it is characterized in that：The transition sphere（3）And sealing
Inner conical surface（4）Total length be L1, the face of cylinder（10）With sealing male cone (strobilus masculinus)（9）Total length be L2, and L2=L1+1.5mm.
9. a kind of high-pressure gas well nipple as claimed in claim 1, it is characterized in that：The sealing inner conical surface（4）Length
Spend for L3, sealing male cone (strobilus masculinus)（9）Length be L4, and L3=L4+0.5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720139329.5U CN206753506U (en) | 2017-02-15 | 2017-02-15 | A kind of high-pressure gas well nipple |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720139329.5U CN206753506U (en) | 2017-02-15 | 2017-02-15 | A kind of high-pressure gas well nipple |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206753506U true CN206753506U (en) | 2017-12-15 |
Family
ID=60609625
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720139329.5U Expired - Fee Related CN206753506U (en) | 2017-02-15 | 2017-02-15 | A kind of high-pressure gas well nipple |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206753506U (en) |
-
2017
- 2017-02-15 CN CN201720139329.5U patent/CN206753506U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171215 Termination date: 20220215 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |