CN106761462A - A kind of oil well casing special nipple - Google Patents
A kind of oil well casing special nipple Download PDFInfo
- Publication number
- CN106761462A CN106761462A CN201611229820.3A CN201611229820A CN106761462A CN 106761462 A CN106761462 A CN 106761462A CN 201611229820 A CN201611229820 A CN 201611229820A CN 106761462 A CN106761462 A CN 106761462A
- Authority
- CN
- China
- Prior art keywords
- screw thread
- thread
- nipple
- oil well
- well casing
- 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.)
- Granted
Links
- 210000002445 nipple Anatomy 0.000 title claims abstract description 44
- 239000003129 oil well Substances 0.000 title claims abstract description 18
- 238000007789 sealing Methods 0.000 claims abstract description 37
- 230000008859 change Effects 0.000 claims description 8
- 230000000694 effects Effects 0.000 abstract description 4
- 230000007797 corrosion Effects 0.000 abstract description 2
- 238000005260 corrosion Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process 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
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/042—Threaded
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 invention discloses a kind of oil well casing special nipple, including the male connection and female adapter that are 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 up of two resealings, double sealing includes 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 is greatly improved, while nipple can bear big tensile and compress load；Primary seal constitutes the sealing reliability that greatly strengthen nipple by two resealings, it is ensured that the security being on active service under nipple harshness operating mode；Do not use traditional to roof platform shoulder, it is to avoid joint occurs the possibility of crevice corrosion during being on active service；Compare with wedge thread, hook screw thread processing of the present invention is simple, and production efficiency is high, is easy to promote the use of.
Description
Technical field
The invention belongs to oil drilling, exploitation and production field, and in particular to a kind of oil well casing special nipple.
Background technology
Oil pipe and casing threads mainly API (American Petroleum Institute, U.S. that petroleum industry is used
Institute of Petroleum of state) standard round thread and API standard buttress thread.API round thread bearing capacitys are poor, make in axial tensile loads
Pull-out failure, API buttress thread poor sealing performances are susceptible to lower contact, gas is susceptible to leakage, so common
API standard nipple cannot meet the requirement of high-pressure gas well.
It is the sealing property of nipple under raising complex working conditions, numerous Special threading connectors are designed and develop
Come.Main flow Special threading connector is designed with torque shoulder and metal/metal sealing surface, and sealing surface form mainly uses the conical surface/cone
Face and the conical surface/sphere form, the screw thread facewidth and space width on middle line are equal.Such Special threading connector has higher
Torque resistant ability and stronger sealing property, screw thread only play connection function, do not undertake moment of torsion, and nipple is in axial tension in addition
Sealing property under load effect can be reduced, so such nipple has not been applied under high torque and axial load operating mode high.
Popular wedge-shaped Varied pole piece Special threading connector male threaded end is designed with sealing surface in the world, and it is same that all threads carries are connected
When bear moment of torsion effect.Do not contacted at such Special threading connector shoulder, due to the presence of radial clearance, gas or liquid flow
During can produce crevice corrosion.In addition, the sealing surface of male threaded end is possible to unexpected during transport and upper button being subject to
Damage and reduce the sealing reliability of nipple.In addition such nipple precision is very high, and wedge thread is difficult to
Processing, so screw thread process efficiency is low, high cost.
The content of the invention
In view of the shortcomings of the prior art, the present invention provides a kind of oil well casing special nipple, solve existing nipple and resist
Torque capability is poor and is susceptible to the problem of leakage, improves security of the nipple under HTHP harshness operating mode.
To achieve the above object, technical scheme is as follows：
A kind of oil well casing special nipple, including the male connection and female adapter being assembled together, it is described outer
Nipple and the screw thread of female adapter are hook-type Varied pole piece screw thread, and the primary seal of nipple is made up 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 thread is equal
It is complete thread；The conical surface/the conical surface seal be located at external screw thread complete thread and incomplete screw thread intermediate location, 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, sphere 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 thread facewidth and internal thread space width gradual change, the internal thread facewidth along female adapter end inwardly by
Gradual change is small, and internal thread space width inwardly becomes larger along female adapter end.
Further, nipple middle line taper is 1:(10~18).
Further, external screw thread pitch and internal thread pitch are equal, and external screw thread and internal 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 are high equal, thread it is high it is taller and bigger by 0.05 than API buttress thread teeth~
0.1mm。
Further, it is 0.4mm that external screw thread tooth top is oriented to side radius of corner, and internal thread bottom of the tooth is oriented to side radius of corner and is
0.2mm, other radiuss of corner of screw thread are identical with API buttress thread radiuss of corner.
Further, the screw thread guide angle is 7~9.5 °, and it is 3~4.5 ° to carry angle.
The present invention includes the male connection and female adapter that are assembled together, and the male connection and internal 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 is greatly improved, while nipple can bear big tensile and compress load.
The primary seal of nipple of the present invention is made up of two resealings, double sealing include the one group of conical surface/conical surface seal and
One group of cylinder/ball face sealing, the sealability and sealing reliability of nipple, the conical surface/conical surface are improved using two resealings
Sealing can provide big sealing area, and cylinder/ball face sealing both can guarantee that nipple when tensile and compress is born
Sealability it is constant, sealability of the nipple when bending is can guarantee that again, the use of double seal form both kept away
The weakness of single sealing is exempted from, the advantage of each seal form has been given full play to again, it is often more important that greatly strengthen screw thread and connect
The sealing reliability of head, it is ensured that the security being on active service under nipple harshness operating mode.
The present invention without conventional Special threading connector use to roof platform shoulder, it is to avoid to there is gap in joint rotten during being on active service
The possibility of erosion, compares with wedge thread, and hook screw thread processing of the present invention is simple, and production efficiency is high, is easy to promote the use of.
Brief description of the drawings
Fig. 1 is a kind of oil well casing special nipple assembling schematic diagram.
Fig. 2 is that enlarged diagram is assembled at the Special threading connector conical surface/conical surface seal.
Fig. 3 is that enlarged diagram is assembled 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 connections；2- female adapters；The 3- conical surfaces/conical surface seal；4- cylinders/ball face sealing；5- central diameters
Line；θ 1- guide angles；θ 2- carry angle；H- teeth are high；H1- height of teeth top；H2- bottom of the tooth is high；The L1- external screw thread facewidth；L2- external screw thread teeth groove
It is wide；L3- internal thread space widths；The L4- internal thread facewidth；P- pitch；R1- external screw threads tooth top is oriented to side radius of corner；R2- internal threads
Bottom of the tooth is oriented to side radius of corner.
Specific embodiment
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
As Figure 1-5, oil well casing special nipple of the invention, including the He of male connection 1 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 the double sealing 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 joint is without shoulder；The taper of Special threading connector middle line 5 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
Spend is 1:12~1:15.
Cylinder/the ball face sealing 4 is located at the end cooperation of male connection 1, the cylinder of the cylinder/ball face sealing 4
In male connection 1, the sphere 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 thread is complete thread；
The external screw thread pitch P and the internal thread pitch P are equal, and the external screw thread and the internal 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 threads, external screw thread facewidth L1 along the end of male connection 1 to
Inside taper into, external screw thread space width L2 inwardly becomes larger along the end of male connection 1；
The internal thread be facewidth L4 and space width L3 gradual change screw threads, internal thread facewidth L4 along the end of female adapter 2 to
Inside taper into, internal thread space width L3 inwardly becomes larger along the end of female adapter 2；
The screw thread height of teeth top H1 and bottom of the tooth H2 high are equal, and thread H1 high is taller and bigger by 0.05 than API buttress thread teeth~
0.1mm；
The external screw thread tooth top is oriented to side radius of corner R1=0.4mm, and internal thread bottom of the tooth is oriented to side radius of corner R2=
0.2mm, other radiuss of corner of screw thread are identical with API buttress thread radiuss of corner；
Screw thread guide angle θ 1=7~9.5 °, carry angle θ 2=3~4.5 °.
General principle of the invention and principal character and advantages of the present invention has 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 simply explanation described in above-described embodiment and specification
Principle of the invention, without departing from the spirit and scope of the present invention, various changes and modifications of the present invention are possible, these
Changes and improvements all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appending claims and
Its equivalent thereof.
Claims (10)
1. a kind of oil well casing special nipple, it is characterised in that：Including the male connection (1) being assembled together and internal thread
The screw thread of joint (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 up of two resealings, and double sealing includes the one group of conical surface/conical surface seal (3) and one group of cylinder/ball face sealing (4), screw thread
Joint is without shoulder.
2. oil well casing special nipple according to claim 1, it is characterised in that：Outside the male connection (1)
Screw thread includes complete thread and incomplete screw thread, and the internal thread is complete thread；The conical surface/conical surface seal (3) position
In external screw thread complete thread and incomplete screw thread intermediate location, the sealing surface taper of the conical surface/conical surface seal (3) is 1:(12
~15).
3. oil well casing special nipple according to claim 1, it is characterised in that：Cylinder/ball face sealing (4) position
At male connection (1) end cooperation, the cylinder of the cylinder/ball face sealing (4) is in male connection (1), sphere
In female adapter (2).
4. the oil well casing special nipple according to Claims 2 or 3, it is characterised in that：The external screw thread facewidth (L1) and outer
Screw thread space width (L2) gradual change, the external screw thread facewidth (L1) is inwardly tapered into along male connection (1) end, external screw thread space width
(L2) inwardly become larger along male connection (1) end.
5. the oil well casing special nipple according to Claims 2 or 3, it is characterised in that：The internal thread facewidth (L4) and interior
Screw thread space width (L3) gradual change, the internal thread facewidth (L4) is inwardly tapered into along female adapter (2) end, internal thread space width
(L3) inwardly become larger along female adapter (2) end.
6. the oil well casing special nipple according to Claims 2 or 3, it is characterised in that：Nipple middle line (5) is bored
Spend is 1:(10~18).
7. the oil well casing special nipple according to Claims 2 or 3, it is characterised in that：External screw thread pitch and internal thread
Pitch is equal, and external screw thread and internal thread are that one inch of 4 pitch thread, i.e. pitch P are 6.35mm.
8. the oil well casing special nipple according to Claims 2 or 3, it is characterised in that：Screw thread height of teeth top (H1) and tooth
(H2) high is equal at bottom, and thread (H1) high is than the tall and big 0.05~0.1mm of API buttress thread teeth.
9. the oil well casing special nipple according to Claims 2 or 3, it is characterised in that：External screw thread tooth top is oriented to side circle
Angular radius (R1) is 0.4mm, and it is 0.2mm that internal thread bottom of the tooth is oriented to side radius of corner (R2), and other radiuss of corner of screw thread are inclined with API
Trapezoidal thread radius of corner is identical.
10. the oil well casing special nipple according to Claims 2 or 3, it is characterised in that：The screw thread guide angle (θ 1)
It it is 7~9.5 °, it is 3~4.5 ° to carry angle (θ 2).
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 true CN106761462A (en) | 2017-05-31 |
| CN106761462B 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 |
|---|---|
| CN (1) | CN106761462B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110410024A (en) * | 2019-06-28 | 2019-11-05 | 中国石油天然气集团有限公司 | A kind of Varied pole piece nipple |
| WO2021036261A1 (en) * | 2019-08-30 | 2021-03-04 | 江苏璞腾油气装备有限公司 | Double-line marine riser coupling |
| CN113027353A (en) * | 2021-02-22 | 2021-06-25 | 天津钢管制造有限公司 | Method for designing buttress thread type thread of petroleum casing pipe |
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|---|---|---|---|---|
| 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
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| 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 |
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Non-Patent Citations (1)
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| 何生厚等: "《高含硫化氢和二氧化碳天然气田开发工程技术》", 31 October 2008, 中国石化出版社 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110410024A (en) * | 2019-06-28 | 2019-11-05 | 中国石油天然气集团有限公司 | A kind of Varied pole piece nipple |
| WO2021036261A1 (en) * | 2019-08-30 | 2021-03-04 | 江苏璞腾油气装备有限公司 | Double-line marine riser coupling |
| CN113027353A (en) * | 2021-02-22 | 2021-06-25 | 天津钢管制造有限公司 | Method for designing buttress thread type thread of petroleum casing pipe |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106761462B (en) | 2019-01-18 |
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