CN106761462B - A kind of oil well casing special nipple - Google Patents
A kind of oil well casing special nipple Download PDFInfo
- Publication number
- CN106761462B CN106761462B CN201611229820.3A CN201611229820A CN106761462B CN 106761462 B CN106761462 B CN 106761462B CN 201611229820 A CN201611229820 A CN 201611229820A CN 106761462 B CN106761462 B CN 106761462B
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- CN
- China
- Prior art keywords
- screw thread
- nipple
- conical surface
- thread
- male connection
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- 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.)
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/042—Threaded
Abstract
The invention discloses a kind of oil well casing special nipples, including the male connection and female adapter being assembled together, the screw thread of the male connection and female adapter is hook-type Varied pole piece screw thread, the primary seal of nipple is made of two resealings, two resealings include the one group of conical surface/conical surface seal and one group of cylinder/ball face sealing, and nipple is without shoulder；Using hook-type Varied pole piece screw thread, all screw threads can undertake torque resistant effect, and nipple torque resistant ability greatly improves, while nipple can bear big tensile and compress load；Primary seal is made of the sealing reliability for greatly strengthening nipple two resealings, ensure that the safety being on active service under nipple harshness operating condition；It does not use traditional to roof platform shoulder, avoids the possibility that crevice corrosion occurs during connector is on active service；Compared with wedge thread, the processing is simple for hook screw thread of the present invention, high production efficiency, convenient for promoting the use of.
Description
Technical field
The invention belongs to oil drilling, exploitation and production fields, and in particular to a kind of oil well casing special nipple.
Background technique
The oil pipe and casing threads that petroleum industry uses are mainly API (American Petroleum Institute, beauty
Institute of Petroleum of state) standard round thread and API standard buttress thread.API round thread bearing capacity is poor, makees in axial tensile loads
It is easy to happen pull-out failure, API buttress thread poor sealing performance with lower contact, gas is easy to happen leakage, so common
API standard nipple is unable to satisfy the requirement of high-pressure gas well.
For the sealing performance for improving nipple under complex working conditions, numerous Special threading connectors are designed and develop
Come.The design of mainstream Special threading connector has torque shoulder and metal/metal sealing surface, and sealing surface form mainly uses the conical surface/cone
Face and the conical surface/spherical surface form, the screw thread facewidth and space width on middle line are equal.Such Special threading connector is with higher
Torque resistant ability and stronger sealing performance, screw thread only play connection function, do not undertake torque, and in addition nipple is being axially stretched
Sealing performance under load effect can reduce, so such nipple has been not suitable under high torque and high axial load operating condition.
The design of popular wedge-shaped Varied pole piece Special threading connector male threaded end has sealing surface in the world, and all threads carries connect same
When bear torque effect.It is not contacted at such Special threading connector shoulder, due to the presence of radial clearance, gas or liquid flowing
Crevice corrosion can be generated in the process.In addition, the sealing surface of male threaded end transport and be possible to during upper button it is unexpected by
Damage and reduce the sealing reliability of nipple.Furthermore such nipple precision is very high, and wedge thread is difficult to
Processing, so screw thread process low efficiency, expense are high.
Summary of the invention
In view of the shortcomings of the prior art, the present invention provides a kind of oil well casing special nipple, it is anti-to solve existing nipple
Torque capability difference and the problem of being easy to happen leakage, improve safety of the nipple under high temperature and pressure harshness operating condition.
To achieve the above object, technical scheme is as follows:
A kind of oil well casing special nipple, it is described outer including the male connection and female adapter being assembled together
Nipple and the screw thread of female adapter are hook-type Varied pole piece screw thread, and the primary seal of nipple is made of two resealings, two
Resealing includes the one group of conical surface/conical surface seal and one group of cylinder/ball face sealing, and nipple is without shoulder.
Further, the external screw thread of the male connection includes complete thread and incomplete screw thread, and the internal screw thread is equal
For complete thread；The conical surface/the conical surface seal is located at external screw thread complete thread and incomplete screw thread intermediate location, and the conical surface/
The sealing surface taper of conical surface seal is 1:(12~15).
Further, the cylinder/ball face sealing is located at the cooperation of male connection end, the cylinder/ball face sealing
Cylinder is located in male connection, spherical surface is located in female adapter.
Further, the external screw thread facewidth and external screw thread space width gradual change, the external screw thread facewidth along male connection end inwardly by
Gradual change is small, and external screw thread space width inwardly becomes larger along male connection end.
Further, the internal screw thread facewidth and internal screw thread space width gradual change, the internal screw thread facewidth along female adapter end inwardly by
Gradual change is small, and internal screw thread space width inwardly becomes larger along female adapter end.
Further, nipple middle line taper is 1:(10~18).
Further, external screw thread screw pitch and internal screw thread screw pitch are equal, and external screw thread and internal screw thread are one inch of 4 pitch thread, i.e. spiral shell
It is 6.35mm away from P.
Further, screw thread height of teeth top and bottom of the tooth height are equal, and thread height ratio API buttress thread tooth is tall and big by 0.05~
0.1mm。
Further, external screw thread tooth top guiding side radius of corner is 0.4mm, and internal screw thread bottom of the tooth guiding side radius of corner is
0.2mm, the other radiuss of corner of screw thread are identical as API buttress thread radius of corner.
Further, the screw thread guide angle is 7~9.5 °, and carrying angle is 3~4.5 °.
The present invention includes the male connection and female adapter being assembled together, and the male connection and internal screw thread connect
The screw thread of head is hook-type Varied pole piece screw thread, and using hook-type Varied pole piece screw thread, all screw threads can undertake torque resistant effect, and screw thread connects
Head torque resistant ability greatly improves, while nipple can bear big tensile and compress load.
The primary seal of nipple of the present invention is made of two resealings, two resealings include the one group of conical surface/conical surface seal and
One group of cylinder/ball face sealing improves the sealability and sealing reliability of nipple, the conical surface/conical surface using two resealings
Sealing can provide big sealing area, and cylinder/ball face sealing both can guarantee nipple when bearing tensile and compress
Sealability it is constant, and can guarantee sealability of the nipple when bending, the use of double seal form was both kept away
The weakness of single sealing is exempted from, and has given full play to the advantage of each seal form, it is often more important that has greatly strengthened screw thread and connect
The sealing reliability of head, ensure that the safety being on active service under nipple harshness operating condition.
The present invention without conventional Special threading connector use to roof platform shoulder, avoid that gap occurs during connector is on active service is rotten
The possibility of erosion, compared with wedge thread, the processing is simple for hook screw thread of the present invention, high production efficiency, convenient for promoting the use of.
Detailed description of the invention
Fig. 1 is a kind of oil well casing special nipple assembling schematic diagram.
Fig. 2 is assembly magnification diagram at the Special threading connector conical surface/conical surface seal.
Fig. 3 is assembly magnification diagram at Special threading connector cylinder/ball face sealing.
Fig. 4 is external screw thread schematic shapes.
Fig. 5 is internal screw thread form schematic diagram.
Wherein: 1- male connection；2- female adapter；The 3- conical surface/conical surface seal；4- cylinder/ball face sealing；5- central diameter
Line；θ 1- guide angle；θ 2- carries angle；H- tooth is high；H1- height of teeth top；H2- bottom of the tooth is high；The L1- external screw thread facewidth；L2- external screw thread tooth socket
It is wide；L3- internal screw thread space width；The L4- internal screw thread facewidth；P- screw pitch；R1- external screw thread tooth top is oriented to side radius of corner；R2- internal screw thread
Bottom of the tooth is oriented to side radius of corner.
Specific embodiment
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
As shown in Figs. 1-5, oil well casing special nipple of the invention, including 1 He of male connection being assembled together
The screw thread of female adapter 2, the male connection 1 and female adapter 2 is hook-type Varied pole piece screw thread, and the primary seal is by two
Resealing is constituted, and two resealing includes the one group of conical surface/conical surface seal 3 and one group of cylinder/ball face sealing 4, the special spiral shell
Line connector is without shoulder；5 taper of Special threading connector middle line is 1:10~1:18；The conical surface/the conical surface seal 3 is located at institute
State Special threading connector external screw thread complete thread and incomplete screw thread intermediate location, the sealing face cone of the conical surface/conical surface seal 3
Degree is 1:12~1:15.
Cylinder/the ball face sealing 4 is located at 1 end cooperation of male connection, the cylinder of the cylinder/ball face sealing 4
In male connection 1, the spherical surface of the cylinder/ball face sealing is located in female adapter 2；
The external screw thread includes complete thread and incomplete screw thread, and the internal screw thread is complete thread；
The external screw thread pitch P and the internal screw thread pitch P are equal, and the external screw thread and the internal screw thread are one inch 4
Pitch thread, i.e. pitch P are 6.35mm；
The external screw thread be facewidth L1 and space width L2 gradual change screw thread, external screw thread facewidth L1 along 1 end of male connection to
It inside gradually becomes smaller, external screw thread space width L2 inwardly becomes larger along 1 end of male connection；
The internal screw thread be facewidth L4 and space width L3 gradual change screw thread, internal screw thread facewidth L4 along 2 end of female adapter to
It inside gradually becomes smaller, internal screw thread space width L3 inwardly becomes larger along 2 end of female adapter；
The screw thread height of teeth top H1 and the high H2 of bottom of the tooth are equal, and the high H1 ratio API buttress thread tooth of thread is tall and big by 0.05~
0.1mm；
The external screw thread tooth top is oriented to side radius of corner R1=0.4mm, and internal screw thread bottom of the tooth is oriented to side radius of corner R2=
0.2mm, the other radiuss of corner of screw thread are identical as API buttress thread radius of corner；
1=7~9.5 ° screw thread guide angle θ carry 2=3~4.5 ° angle θ.
Basic principles and main features and advantages of the present invention of the invention have been shown and described above.The skill of the industry
Art personnel it should be appreciated that the present invention is not limited to the above embodiments, the above embodiments and description only describe
The principle of the present invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these
Changes and improvements all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and
Its equivalent thereof.
Claims (5)
1. a kind of oil well casing special nipple, it is characterised in that: including the male connection (1) being assembled together and internal screw thread
The screw thread of connector (2), the male connection (1) and female adapter (2) is hook-type Varied pole piece screw thread, and the master of nipple is close
Envelope is made of two resealings, and two resealings include the one group of conical surface/conical surface seal (3) and one group of cylinder/ball face sealing (4), screw thread
Connector is without shoulder；
The external screw thread of the male connection (1) includes complete thread and incomplete screw thread, and the internal screw thread is complete spiral shell
Line；The conical surface/the conical surface seal (3) is located at external screw thread complete thread and incomplete screw thread intermediate location, and the conical surface/conical surface is close
The sealing surface taper for sealing (3) is 1:(12~15)；
Cylinder/the ball face sealing (4) is located at male connection (1) end cooperation, the column of the cylinder/ball face sealing (4)
Face is located on male connection (1), spherical surface is located on female adapter (2)；
The external screw thread facewidth (L1) and external screw thread space width (L2) gradual change, the external screw thread facewidth (L1) along male connection (1) end to
It inside gradually becomes smaller, external screw thread space width (L2) inwardly becomes larger along male connection (1) end；
The internal screw thread facewidth (L4) and internal screw thread space width (L3) gradual change, the internal screw thread facewidth (L4) along female adapter (2) end to
It inside gradually becomes smaller, internal screw thread space width (L3) inwardly becomes larger along female adapter (2) end；
Screw thread guide angle (θ 1) is 7~9.5 °, and carrying angle (θ 2) is 3~4.5 °.
2. oil well casing special nipple according to claim 1, it is characterised in that: nipple middle line (5) taper
For 1:(10~18).
3. oil well casing special nipple according to claim 1, it is characterised in that: external screw thread screw pitch and internal screw thread screw pitch
Equal, external screw thread and internal screw thread are one inch of 4 pitch thread, i.e., pitch P is 6.35mm.
4. oil well casing special nipple according to claim 1, it is characterised in that: screw thread height of teeth top (H1) and bottom of the tooth are high
(H2) equal, screw thread height of teeth top (H1) is 0.05~0.1mm taller and bigger than API buttress thread tooth.
5. oil well casing special nipple according to claim 1, it is characterised in that: external screw thread tooth top is oriented to side fillet half
Diameter (R1) is 0.4mm, and it is 0.2mm that internal screw thread bottom of the tooth, which is oriented to side radius of corner (R2), and the other radiuss of corner of screw thread and API are partially trapezoidal
Screw thread radius of corner is identical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611229820.3A CN106761462B (en) | 2016-12-27 | 2016-12-27 | A kind of oil well casing special nipple |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611229820.3A CN106761462B (en) | 2016-12-27 | 2016-12-27 | A kind of oil well casing special nipple |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106761462A CN106761462A (en) | 2017-05-31 |
| CN106761462B true CN106761462B (en) | 2019-01-18 |
Family
ID=58922298
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611229820.3A Active CN106761462B (en) | 2016-12-27 | 2016-12-27 | A kind of oil well casing special nipple |
Country Status (1)
| Country | Link |
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| CN (1) | CN106761462B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110410024B (en) * | 2019-06-28 | 2021-09-28 | 中国石油天然气集团有限公司 | Variable tooth width screwed joint |
| CN110608321A (en) * | 2019-08-30 | 2019-12-24 | 江苏璞腾油气装备有限公司 | Double-line marine riser joint |
| CN113027353B (en) * | 2021-02-22 | 2022-11-08 | 天津钢管制造有限公司 | Method for designing buttress thread type thread of petroleum casing pipe |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003089754A1 (en) * | 2002-04-22 | 2003-10-30 | S.C. Petrotub S.A. Roman | Pipe threaded joint |
| CN202627987U (en) * | 2012-04-27 | 2012-12-26 | 内蒙古第一机械制造集团大地石油机械有限责任公司 | Gas seal sleeve for non-conventional gas field and sleeve coupling |
| CN102926674A (en) * | 2011-08-11 | 2013-02-13 | 中国石油天然气集团公司 | Low pressure gas seal special screwed joint |
| CN103362458A (en) * | 2013-08-03 | 2013-10-23 | 无锡西姆莱斯石油专用管制造有限公司 | Multi-plane sealing tooth-width-changing wedge type coupling structure and oil well pipe structure |
| CN103362450A (en) * | 2013-08-03 | 2013-10-23 | 无锡西姆莱斯石油专用管制造有限公司 | Non-coupling multi-sealing tooth-width-variable wedge type threaded oil well pipe structure |
| CN204002601U (en) * | 2014-07-16 | 2014-12-10 | 江苏常宝钢管股份有限公司 | The incompressible casing threaded connection structure of triple seal |
-
2016
- 2016-12-27 CN CN201611229820.3A patent/CN106761462B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003089754A1 (en) * | 2002-04-22 | 2003-10-30 | S.C. Petrotub S.A. Roman | Pipe threaded joint |
| CN102926674A (en) * | 2011-08-11 | 2013-02-13 | 中国石油天然气集团公司 | Low pressure gas seal special screwed joint |
| CN202627987U (en) * | 2012-04-27 | 2012-12-26 | 内蒙古第一机械制造集团大地石油机械有限责任公司 | Gas seal sleeve for non-conventional gas field and sleeve coupling |
| CN103362458A (en) * | 2013-08-03 | 2013-10-23 | 无锡西姆莱斯石油专用管制造有限公司 | Multi-plane sealing tooth-width-changing wedge type coupling structure and oil well pipe structure |
| CN103362450A (en) * | 2013-08-03 | 2013-10-23 | 无锡西姆莱斯石油专用管制造有限公司 | Non-coupling multi-sealing tooth-width-variable wedge type threaded oil well pipe structure |
| CN204002601U (en) * | 2014-07-16 | 2014-12-10 | 江苏常宝钢管股份有限公司 | The incompressible casing threaded connection structure of triple seal |
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| Publication number | Publication date |
|---|---|
| CN106761462A (en) | 2017-05-31 |
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