CN108868658A - A kind of casing thread connection with multi-sealed face screw thread positive-angle - Google Patents
A kind of casing thread connection with multi-sealed face screw thread positive-angle Download PDFInfo
- Publication number
- CN108868658A CN108868658A CN201810683710.7A CN201810683710A CN108868658A CN 108868658 A CN108868658 A CN 108868658A CN 201810683710 A CN201810683710 A CN 201810683710A CN 108868658 A CN108868658 A CN 108868658A
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- Prior art keywords
- thread
- face
- pin
- conical surface
- female
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- 238000007789 sealing Methods 0.000 claims abstract description 36
- 230000004323 axial length Effects 0.000 claims description 5
- 239000011324 bead Substances 0.000 claims description 5
- 238000005516 engineering process Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 12
- 230000007704 transition Effects 0.000 description 5
- 210000002445 nipple Anatomy 0.000 description 3
- 238000007906 compression Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000003466 anti-cipated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/08—Casing joints
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
Abstract
The present invention provides a kind of casing thread connection with multi-sealed face screw thread positive-angle, including female thread and pin thread, internal screw thread has been set gradually from left to right on the female thread, female thread spherical seal surface, female thread conical surface seal face, female thread torque shoulder face, external screw thread has been set gradually from left to right on the pin thread, pin thread cylindrical sealing surface, pin thread conical surface seal face, pin thread torque shoulder face, the female thread and the pin thread are meshed together by the internal screw thread and the external screw thread, the female thread spherical seal surface and the pin thread cylindrical sealing surface are in close contact, female thread conical surface seal face and pin thread conical surface seal face are in close contact, female thread torque shoulder face and pin thread torque shoulder face are in close contact, the pin thread sealed end inner surface is provided with cylindrical surface and circular conical surface.Through the invention, to solve the problems, such as casing joint of the existing technology in cycle of higher pressure load and manage seal failure under inside and outside high pressure load acts on.
Description
Technical field
The present invention relates to a kind of casing thread connections, and in particular to a kind of casing with multi-sealed face screw thread positive-angle
Nipple.
Background technique
In recent years, as the geological condition of the exhausted and new oil/gas well region of old oil/gas well is more complicated, with
Oil gas well mining depth is also deeper and deeper, and the depth of casing cementing is also just increasing, and the pressure that casing is born is also increasing.
In this way to the safety of casing and leakproofness, especially leakproofness, service performance requires also higher and higher.
At present during oil gas well mining, as well is deeper and deeper, well cementing casing pipe is followed in receiving pulling force and compression high pressure
The effect of ring load is lower to occur casing thread connection failure, causes very big economy to damage to unit in charge of construction and Party A company in this way
It loses.
Summary of the invention
The present invention provides a kind of casing thread connection with multi-sealed face screw thread positive-angle, is deposited with solving the prior art
Casing joint in cycle of higher pressure load and the problem of manage seal failure under inside and outside high pressure load effect.
It is connect in order to solve the above technical problems, the present invention provides a kind of casing threads with multi-sealed face screw thread positive-angle
Head, including female thread and pin thread have been set gradually from left to right internal screw thread, female thread spherical seal surface, the female thread conical surface on the female thread
Sealing surface, female thread torque shoulder face have been set gradually from left to right external screw thread, pin thread cylindrical sealing surface, pin thread on the pin thread
Conical surface seal face, pin thread torque shoulder face, the female thread and the pin thread are engaged on by the internal screw thread and the external screw thread
Together, the female thread spherical seal surface and the pin thread cylindrical sealing surface are in close contact, female thread conical surface seal face and described
Pin thread conical surface seal face is in close contact, and female thread torque shoulder face and pin thread torque shoulder face are in close contact, the public affairs
Button sealed end inner surface is provided with cylindrical surface and circular conical surface, and the cylindrical surface is close to pin thread torque shoulder face.
The loading end angle beta of the internal screw thread2It is 0 °~3 °, guide surface angle beta1It is 5 °~15 °, it is described externally threaded to hold
Section angle beta3It is 0 °~3 °, guide surface angle beta4It is 5 °~15 °.
The female thread spherical seal surface and pin thread cylindrical sealing surface interference fit, female thread conical surface seal face and pin thread cone
Face sealing surface is also interference fit, and magnitude of interference is between 0.20~0.60mm.
Arc smooth transition, pin thread cylindrical sealing surface are used between the female thread spherical seal surface and female thread conical surface seal face
Also arc transition cooperates with pin thread conical surface seal face.
The radius of the circular arc is 0.3mm~1.0mm.
The spherical radius of the female thread spherical seal surface is 2.0mm~6.0mm.
The angle in female thread conical surface seal face is between 0 °~10 °, and the axial length in female thread conical surface seal face
Between 10mm~20mm, the angle in pin thread conical surface seal face is between 0 °~10 °, and pin thread conical surface seal face
Axial length is between 10mm~20mm.
Female thread torque shoulder face end is provided with -10 °~-20 ° of reversed chamfering α1, pin thread torque shoulder face
End is provided with -10 °~-20 ° of reversed chamfering α2。
The length on the cylindrical surface is 10mm~20mm, and the taper of the circular conical surface is 0 °~10 °.
Female thread torque shoulder face and female thread conical surface seal face use female thread arc smooth transition, the pin thread torque platform
Shoulder face and pin thread conical surface seal face use pin thread arc smooth transition.
Bring beneficial effect of the present invention：Casing thread connection provided by the invention by female thread be arranged internal screw thread,
External screw thread, pin thread cylindrical seal is arranged in female thread spherical seal surface, female thread conical surface seal face, female thread torque shoulder face on pin thread
Face, pin thread conical surface seal face, pin thread torque shoulder face, internal screw thread and external screw thread mesh together, the conical surface seal face of pin thread with
Female thread conical surface seal face forms interference fit and forms sealing surface, and female thread spherical seal surface forms interference with pin thread cylindrical sealing surface and matches
Conjunction forms sealing surface, and the contact of box and pin circular bead surface forms sealing surface, casing thread connection is made to obtain multiple protective, improves set
The sealing performance of pipe, it is ensured that product of the present invention has relatively reliable sealing performance.
Detailed description of the invention
Fig. 1 is that the overall structure of the casing thread connection with multi-sealed face screw thread positive-angle of the embodiment of the present invention is shown
It is intended to.
Fig. 2 is the partial structurtes enlarged diagram of I in Fig. 1.
Fig. 3 is the partial structurtes enlarged diagram of T in Fig. 2.
Fig. 4 is the partial structurtes enlarged diagram of female thread in Fig. 2.
Fig. 5 is the partial structurtes enlarged diagram of M in Fig. 4.
Fig. 6 is the partial structurtes enlarged diagram of pin thread in Fig. 2.
Fig. 7 is the partial structurtes enlarged diagram of N in Fig. 6.
Wherein, A- female thread, B- pin thread, 1- internal screw thread, 2- external screw thread, 3- female thread spherical seal surface, 4- pin thread cylindrical seal
Face, 5- circular arc, 6- female thread conical surface seal face, 7- pin thread conical surface seal face, 8- female thread circular arc, 9- pin thread circular arc, 10- female thread torque
Circular bead surface, 11- pin thread torque shoulder face, the cylindrical surface 12-, 13- circular conical surface.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with drawings and the specific embodiments, to this
Invention is described in further detail.
Fig. 1 is that the overall structure of the casing thread connection with multi-sealed face screw thread positive-angle of the embodiment of the present invention is shown
It is intended to.
Fig. 2 is the partial structurtes enlarged diagram of I in Fig. 1.
Fig. 3 is the partial structurtes enlarged diagram of T in Fig. 2.
Fig. 4 is the partial structurtes enlarged diagram of female thread in Fig. 2.
Fig. 5 is the partial structurtes enlarged diagram of M in Fig. 4.
Fig. 6 is the partial structurtes enlarged diagram of pin thread in Fig. 2.
Fig. 7 is the partial structurtes enlarged diagram of N in Fig. 6.
As shown in Fig. 1-Fig. 7, a kind of casing thread connection with multi-sealed face screw thread positive-angle provided by the invention,
Including being set gradually from left to right internal screw thread 1, female thread spherical seal surface 3, female thread cone on female thread A and pin thread B, the female thread A
Face sealing surface 6, female thread torque shoulder face 10 have been set gradually from left to right external screw thread 2, pin thread cylindrical seal on the pin thread B
Face 4, pin thread conical surface seal face 7, pin thread torque shoulder face 11, the female thread A and the pin thread B pass through the internal screw thread 1 and institute
It states external screw thread 2 to mesh together, the female thread spherical seal surface 3 and the pin thread cylindrical sealing surface 4 are in close contact, the female thread
Conical surface seal face 6 and pin thread conical surface seal face 7 are in close contact, female thread torque shoulder face 10 and the pin thread torque platform
Shoulder face 11 is in close contact, and the pin thread B sealed end inner surface is provided with cylindrical surface 12 and circular conical surface 13, the cylindrical surface 12 close to
Pin thread torque shoulder face 11.The length on the cylindrical surface 12 is 10mm~20mm, the taper of the circular conical surface 13 is 0 °~
10°.Pin thread B sealed end inner surface is arranged to cylindrical surface and circular conical surface can be with, it is possible to reduce the resistance of tube fluid.
In the present embodiment, the loading end angle beta of the internal screw thread 12It is 0 °~3 °, guide surface angle beta1It is 5 °~15 °,
The loading end angle beta of the external screw thread 23It is 0 °~3 °, guide surface angle beta4It is 5 °~15 °.
The female thread spherical seal surface 3 and pin thread cylindrical sealing surface 4 are interference fitted, female thread conical surface seal face 6 and public affairs
Detaining conical surface seal face 7 is also interference fit, and magnitude of interference is between 0.20~0.60mm.
5 rounding off of circular arc is used between the female thread spherical seal surface 3 and female thread conical surface seal face 6, pin thread cylindricality is close
Also arc transition cooperates for cover 4 and pin thread conical surface seal face 7.
The radius of the circular arc 5 is 0.3mm~1.0mm.
The spherical radius of the female thread spherical seal surface 3 is 2.0mm~6.0mm.
The angle in female thread conical surface seal face 6 is between 0 °~10 °, and the axial direction in female thread conical surface seal face 6 is long
Degree is between 10mm~20mm, and the angle in pin thread conical surface seal face 7 is between 0 °~10 °, and the pin thread conical surface seal
The axial length in face 7 is between 10mm~20mm.
10 end of female thread torque shoulder face is provided with -10 °~-20 ° of reversed chamfering α1, the pin thread torque shoulder
11 end of face is provided with -10 °~-20 ° of reversed chamfering α2。
Female thread torque shoulder face 10 and female thread conical surface seal face 6 use 8 rounding off of female thread circular arc, and the pin thread is turned round
Square circular bead surface 11 and pin thread conical surface seal face 7 use 9 rounding off of pin thread circular arc.
The present invention relates to a kind of petroleum gas seamless casing special buckle industry pipe screw joints comprising is machined with outer
The pin thread of threaded connection and the female thread for being machined with internal screw thread and connecting comprising pin thread and female thread with contact surface contact table
Face includes threaded portions contact and unthreaded sections contact.Threaded portions contact includes that internal screw thread tooth top connects with external screw thread bottom of the tooth
The carrying face contact of touching and internal and external screw thread tooth.Unthreaded sections contact includes internal screw thread sealing spherical surface and external screw thread cylindrical surface
Contact, the step face contact of the conical surface and taper-face contact and internal and external threads.The wall surface of male and female step surface and axis hole is circle
Arc rounding off.Internal screw thread spherical sealed and conical surface seal are all made of interference fit.In the present invention, by the spherical surface on internal screw thread
The fit system that interference is used with external screw thread cylinder, even if generating excessive yield deformation in cone seal and leading to seal failure
In the case where, spherical surface remains to keep sealing performance with the conical surface, and such design can effectively improve nipple under severe outer load
Still keep excellent sealing performance.
Furthermore, it is understood that the nipple is to connect male and female button according to the torque value of setting when with hydraulic tongs
Come, until the step surface of the step face contact female thread of pin thread.The sealing cone of pin thread and the female thread sealing surface conical surface were formed at this time
It is full of cooperation, female thread seals spherical surface and the column sealed face of pin thread forms and is interference fitted.Two sealing surfaces are mutually independent of each other, to reach
Expected gas sealing ability requirement.
Technical solution according to the invention, the pipe screw joint be when box and pin it is anticipated that torque be connected to one
When rising, the torque shoulder face of female thread and the torque shoulder face of pin thread are in close contact together, control male and female position on the buckle.Together
When male and female conical seal (contact) face interference fit is kept in the elastic range of material, play sealing function.Male and female spherical shape
Sealing and cylindrical seal enter interference seal, to form secondary interference seal.
This pipe screw joint is inserted in female thread by make-up device in practical operation, by pin thread, and casing first uses the slow-speed of revolution
2 circle left and right are screwed in, then use 15 revolving speeds for enclosing left and right per minute to screw in until finally using every lower than 5 circles when last 1~2 encloses
The revolving speed of minute is further threaded into predetermined position.
The working principle of this pipe screw joint is that tight interference fit, the shoulder conical surface are formed after box and pin taper-face contact
It positions rapidly, guarantee twist-on positioning accuracy, during twist-on, spherical surface and cylinder also generate interference fit, and shoulder not only positions
Accurately, it while can reduce axial force, in pin thread, female thread engagement process, considerably increase anti-compression properties, the sealing of connector
Property, while also guaranteeing that conical seal (contact) face fits closely together.
In conclusion casing thread connection provided by the invention on female thread by being arranged internal screw thread, female thread spherical sealed
Face, female thread conical surface seal face, female thread torque shoulder face, are arranged external screw thread on pin thread, and pin thread cylindrical sealing surface, the pin thread conical surface are close
Cover, pin thread torque shoulder face, internal screw thread and external screw thread, mesh together, the conical surface seal face of pin thread and female thread conical surface seal
Face forms interference fit and forms sealing surface, and female thread spherical seal surface and pin thread cylindrical sealing surface form interference fit and form sealing
The contact in face, box and pin circular bead surface forms sealing surface, and casing thread connection is made to obtain multiple protective, improves the leakproofness of casing
It can, it is ensured that product of the present invention has relatively reliable sealing performance.
The above description is only an embodiment of the present invention, is not intended to restrict the invention, for those skilled in the art
For member, the invention may be variously modified and varied.All within the spirits and principles of the present invention, it is made it is any modification,
Equivalent replacement, improvement etc., should be included within scope of the presently claimed invention.
Claims (10)
1. a kind of casing thread connection with multi-sealed face screw thread positive-angle, including female thread (A) and pin thread (B), feature
It is, internal screw thread (1), female thread spherical seal surface (3), female thread conical surface seal has been set gradually from left to right on the female thread (A)
Face (6), female thread torque shoulder face (10) have been set gradually from left to right external screw thread (2) on the pin thread (B), and pin thread cylindricality is close
Cover (4), pin thread conical surface seal face (7), pin thread torque shoulder face (11), the female thread (A) and the pin thread (B) pass through described
Internal screw thread (1) and the external screw thread (2) mesh together, the female thread spherical seal surface (3) and the pin thread cylindrical sealing surface
(4) it is in close contact, female thread conical surface seal face (6) and pin thread conical surface seal face (7) are in close contact, the female thread torque
Circular bead surface (10) and pin thread torque shoulder face (11) are in close contact, and pin thread (B) the sealed end inner surface is provided with cylinder
Face (12) and circular conical surface (13), the cylindrical surface (12) is close to pin thread torque shoulder face (11).
2. as described in claim 1 with the casing thread connection of multi-sealed face screw thread positive-angle, which is characterized in that described
The loading end angle beta of internal screw thread (1)2It is 0 °~3 °, guide surface angle beta1It is 5 °~15 °, the carrying face angle of the external screw thread (2)
Spend β3It is 0 °~3 °, guide surface angle beta4It is 5 °~15 °.
3. as described in claim 1 with the casing thread connection of multi-sealed face screw thread positive-angle, which is characterized in that described
Female thread spherical seal surface (3) and pin thread cylindrical sealing surface (4) interference fit, female thread conical surface seal face (6) and the pin thread conical surface
Sealing surface (7) is also interference fit, and magnitude of interference is between 0.20~0.60mm.
4. as described in claim 1 with the casing thread connection of multi-sealed face screw thread positive-angle, which is characterized in that described
Circular arc (5) rounding off is used between female thread spherical seal surface (3) and female thread conical surface seal face (6).
5. as claimed in claim 4 with the casing thread connection of multi-sealed face screw thread positive-angle, which is characterized in that described
The radius of circular arc (5) is 0.3mm~1.0mm.
6. as described in claim 1 with the casing thread connection of multi-sealed face screw thread positive-angle, which is characterized in that described
The spherical radius of female thread spherical seal surface (3) is 2.0mm~6.0mm.
7. as described in claim 1 with the casing thread connection of multi-sealed face screw thread positive-angle, which is characterized in that described
The angle in female thread conical surface seal face (6) is between 0 °~10 °, and the axial length in female thread conical surface seal face (6) is in 10mm
Between~20mm, the angle in pin thread conical surface seal face (7) is between 0 °~10 °, and pin thread conical surface seal face (7)
Axial length is between 10mm~20mm.
8. as described in claim 1 with the casing thread connection of multi-sealed face screw thread positive-angle, which is characterized in that described
Female thread torque shoulder face (10) end is provided with -10 °~-20 ° of reversed chamfering α1, pin thread torque shoulder face (11) end
It is provided with -10 °~-20 ° of reversed chamfering α2。
9. as described in claim 1 with the casing thread connection of multi-sealed face screw thread positive-angle, which is characterized in that described
The length on cylindrical surface (12) is 10mm~20mm, and the taper of the circular conical surface (13) is 0 °~10 °.
10. as described in claim 1 with the casing thread connection of multi-sealed face screw thread positive-angle, which is characterized in that institute
Female thread torque shoulder face (10) and female thread conical surface seal face (6) are stated using female thread circular arc (8) rounding off, the pin thread torque platform
Shoulder face (11) and pin thread conical surface seal face (7) use pin thread circular arc (9) rounding off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810683710.7A CN108868658A (en) | 2018-06-28 | 2018-06-28 | A kind of casing thread connection with multi-sealed face screw thread positive-angle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810683710.7A CN108868658A (en) | 2018-06-28 | 2018-06-28 | A kind of casing thread connection with multi-sealed face screw thread positive-angle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108868658A true CN108868658A (en) | 2018-11-23 |
Family
ID=64296211
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810683710.7A Pending CN108868658A (en) | 2018-06-28 | 2018-06-28 | A kind of casing thread connection with multi-sealed face screw thread positive-angle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108868658A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113914787A (en) * | 2020-07-10 | 2022-01-11 | 中国海洋石油集团有限公司 | High-temperature-resistant bidirectional thread sealing structure |
| CN114270012A (en) * | 2019-09-24 | 2022-04-01 | 日本制铁株式会社 | Threaded joint |
| CN114867960A (en) * | 2020-01-17 | 2022-08-05 | 日本制铁株式会社 | Threaded joint for pipe |
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| CN104373057A (en) * | 2014-11-28 | 2015-02-25 | 中国石油天然气集团公司 | Gas seal threaded connector casing pipe for low-pressure gas field horizontal well |
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| CN114270012A (en) * | 2019-09-24 | 2022-04-01 | 日本制铁株式会社 | Threaded joint |
| CN114867960A (en) * | 2020-01-17 | 2022-08-05 | 日本制铁株式会社 | Threaded joint for pipe |
| CN114867960B (en) * | 2020-01-17 | 2023-11-21 | 日本制铁株式会社 | Threaded joint for pipe |
| CN113914787A (en) * | 2020-07-10 | 2022-01-11 | 中国海洋石油集团有限公司 | High-temperature-resistant bidirectional thread sealing structure |
| CN113914787B (en) * | 2020-07-10 | 2023-11-24 | 中国海洋石油集团有限公司 | High-temperature-resistant bidirectional thread sealing structure |
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