CN2276068Y - Nipple for oil well pipe - Google Patents
Nipple for oil well pipe Download PDFInfo
- Publication number
- CN2276068Y CN2276068Y CN 96223035 CN96223035U CN2276068Y CN 2276068 Y CN2276068 Y CN 2276068Y CN 96223035 CN96223035 CN 96223035 CN 96223035 U CN96223035 U CN 96223035U CN 2276068 Y CN2276068 Y CN 2276068Y
- Authority
- CN
- China
- Prior art keywords
- face
- thread piece
- interference
- magnitude
- nipple
- 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.)
- Expired - Lifetime
Links
- 239000003129 oil well Substances 0.000 title claims abstract description 14
- 210000002445 nipple Anatomy 0.000 title claims description 12
- 238000007789 sealing Methods 0.000 claims abstract description 24
- 230000007704 transition Effects 0.000 claims abstract description 6
- 230000004323 axial length Effects 0.000 claims description 5
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
Images
Abstract
The utility model discloses a threaded joint for oil well pipes which is a conical threaded joint. The front end of an outer threaded element (1) is provided with a cylindrical sealing face which is guided by an end conical face with a conicity tgthet< 1 >=1/10-1/20. An inner threaded element (2) is provided with a cylindrical hole sealing face (6) which is guided by a conical transition face (10) with a conicity tgthet< 2 >=1/10-1/20 out of the inner face threads of the inner threaded element (2). The two sealing faces (5) and (6) are fit closely and form a primary sealing part (4). When the threaded joint is axially drawn, the face pressure of the primary sealing part can kept constant, therefore, the threaded joint has a good sealing performance. The sealing faces and guiding parts are all composed of cylindrical faces and conical faces.
Description
The utility model relates to a kind of oil well pipe thread joint, is a kind of tapered thread joint that is suitable for oil gas well, thick oil thermal extraction use.
BP GB2160609 discloses a kind of oil well pipe thread joint, is made up of external thread piece and inner thread piece two parts.Interference fit forms the primary seal part between radially dome arc sealing surface on the anterior optical axis of external thread piece pipe end and the circular cone sealing surface beyond the inner thread piece inner face screw thread, and external thread piece pipe end face and the butt joint of inner thread piece bottom shoulder side form secondary hermetic unit.The primary seal part has magnitude of interference Δ D at sealing, and it is used to adjust the size between screw thread magnitude of interference Δ d and the primary seal part face pressure P.Purpose is to prevent to produce stress corrosion cracking (SCC) by the circumferential stress that suppresses inner thread piece, and good intensity and sealing is provided.Existing problem is: its primary seal part is made of radially convex arc surface and taper seat interference fit, and when being subjected to axial tension, primary seal part face drops influence sealing performance, and axial tension is the main load of bearing under the oil well pipe duty.Radially convex arc surface and taper seat and circular arc leader must could be processed and repair on Digit Control Machine Tool, influence its promoting the use of in the oil field.
The purpose of this utility model provides a kind of excellent sealing ability that has, and can finish processing and the oil well pipe thread joint of repairing on non-numerically controlled lathe.
The purpose of this utility model is to realize like this.
A kind of oil well pipe thread joint is the tapered thread joint, is made up of external thread piece and inner thread piece, and threaded portion has magnitude of interference Δ d, and form of thread is for trapezoidal partially, and external thread piece pipe end face docks with inner thread piece bottom shoulder side and constitutes secondary hermetic unit.The external thread piece front end has one by tapering tg θ
1Column sealed of the end-cone face of=1/10-1/20 guiding has one by tapering tg θ beyond the inner thread piece inner face screw thread
2The cylindrical hole sealing surface of the circular cone transition face guiding of=1/10-1/20, two sealing surface interference fit constitute the primary seal part, the axial length Δ L=0.15-3mm of its interference fit contact surface, magnitude of interference Δ D is controlled at the face that primary seal is partly formed and presses P to satisfy relational expression: interior pressure＜P that nipple bears＜nipple YIELD STRENGTH, the relation between magnitude of interference Δ D and the screw thread magnitude of interference Δ d is: Δ D＞Δ d.
End-cone face on the external thread piece has identical tapering with circular cone transition face on the inner thread piece, and tg θ
1=tg θ
2=1/16.
Load-side angle [alpha]=the 0-3 of its buttress thread tooth form of threaded portion °, guiding side angle beta=10 °-45 °.
External thread piece is an end of a pipe, and inner thread piece can be an end of another pipe, also can be an end of pipe box cupling.
The advantage that the utility model is compared with prior art had is: primary seal part cooperates with the cylindrical hole sealing surface by column sealed and constitutes, and the interference fit contact surface has certain axial length, when being subjected to axial tension, it is constant to keep primary seal part face to press, thereby has excellent sealing ability.The face of cylinder, cylindrical hole face and the circular cone leader that constitute the primary seal part are easy to in-process measurement, make this nipple can finish processing and repair on non-Digit Control Machine Tool, are convenient to promote the use of in the oil field.
Introduce embodiment of the present utility model below in conjunction with accompanying drawing.
Fig. 1 is the structure chart of the utility model oil well pipe thread joint.
Fig. 2 is the A portion zoomed-in view of Fig. 1.
Fig. 3 is the B portion zoomed-in view of Fig. 1.
As shown in Figure 1, the utility model oil well pipe thread joint is the tapered thread joint, is made up of external thread piece 1 and inner thread piece 2, and external thread piece 1 is an end of a pipe, and inner thread piece 2 is ends of a pipe box cupling.Threaded portion 3 has magnitude of interference Δ d=0.03mm, and form of thread is for trapezoidal partially, as shown in Figure 3, and its load-side angle [alpha]=3 °, guiding side angle beta=30 °, screw thread tooth depth h=0.8mm.As seen from Figure 2, external thread piece 1 front end has one by tapering tg θ
1Column sealed 5 of=1/16 end-cone face 9 guiding has one by tapering tg θ beyond the inner thread piece 2 inner face screw threads
2Cylindrical hole sealing surface 6, two sealing surfaces 5,6 interference fit of=1/16 circular cone transition face 10 guiding constitute primary seal part 4.The axial length Δ L=0.25mm of its interference fit contact surface.Column sealed 5 external diameter is D
1, the internal diameter of cylindrical hole sealing surface 6 is D
2, D
1＞D
2Make primary seal part 4 have magnitude of interference Δ D, the face that forms the primary seal part is pressed P, magnitude of interference Δ D should be controlled at the face that makes the primary seal part and press P to satisfy relational expression: interior pressure＜P that nipple bears＜nipple YIELD STRENGTH, and the relation between the magnitude of interference Δ D of primary seal part 4 and the screw thread magnitude of interference Δ d is: Δ D＞Δ d.External thread piece 1 pipe end face docks with inner thread piece 2 bottom shoulders 7 sides and constitutes secondary hermetic unit 8.
The utility model oil well pipe thread joint, because primary seal part 4 adopts column sealed 5 and cylindrical hole sealing surface 6 interference fit formation, and the interference fit contact surface has certain axial length, thereby, when it is in running order when being subjected to axial tension, can keep the face pressure of primary seal part 4 constant, keep sealing effectiveness.The primary seal of this nipple and leader constitute by cylinder (hole) face and circular cone (hole) face, and its processing can be finished at the scene, oil field of no Digit Control Machine Tool with reparation, are easy to promote.
The utility model oil well pipe thread joint can be used as the joint that external diameter is all oil well pipes of 60.3～339.7mm.
Claims (4)
1. oil well pipe thread joint, be the tapered thread joint, form by external thread piece and inner thread piece, threaded portion has magnitude of interference Δ d, form of thread is for trapezoidal partially, external thread piece pipe end face docks with inner thread piece bottom shoulder side and constitutes secondary hermetic unit, and it is characterized in that: external thread piece (1) front end has one by tapering tg θ
1Column sealed (5) of end-cone face (9) guiding of=1/10-1/20 have one by tapering tg θ beyond inner thread piece (2) the inner face screw thread
2The cylindrical hole sealing surface (6) of circular cone transition face (10) guiding of=1/10-1/20, two sealing surfaces (5), (6) interference fit constitute primary seal part (4), the axial length Δ L=0.15-3mm of its interference fit contact surface, magnitude of interference Δ D is controlled at the face that primary seal is partly formed and presses P to satisfy relational expression: interior pressure＜P that nipple bears＜nipple YIELD STRENGTH, the relation between magnitude of interference Δ D and the screw thread magnitude of interference Δ d is: Δ D＞Δ d.
2. nipple according to claim 1 is characterized in that: the end-cone face (9) on the described external thread piece (1) has identical tapering with circular cone transition face (10) on the inner thread piece (2), and tg θ
1=tg θ
2=1/16.
3. nipple according to claim 1 is characterized in that: described threaded portion (3), the load-side angle [alpha]=0-3 of its buttress thread tooth form °, guiding side angle beta=10 °-45 °.
4. nipple according to claim 1 is characterized in that: described external thread piece (1) is an end of a pipe, and inner thread piece (2) can be an end of another pipe, also can be an end of pipe box cupling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96223035 CN2276068Y (en) | 1996-09-25 | 1996-09-25 | Nipple for oil well pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96223035 CN2276068Y (en) | 1996-09-25 | 1996-09-25 | Nipple for oil well pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2276068Y true CN2276068Y (en) | 1998-03-11 |
Family
ID=33902429
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96223035 Expired - Lifetime CN2276068Y (en) | 1996-09-25 | 1996-09-25 | Nipple for oil well pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2276068Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104775761A (en) * | 2014-01-10 | 2015-07-15 | 杰富意钢铁株式会社 | Threaded joint for ultra thick oil well pipe |
-
1996
- 1996-09-25 CN CN 96223035 patent/CN2276068Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104775761A (en) * | 2014-01-10 | 2015-07-15 | 杰富意钢铁株式会社 | Threaded joint for ultra thick oil well pipe |
| CN104775761B (en) * | 2014-01-10 | 2019-07-09 | 杰富意钢铁株式会社 | Pole heavy wall screw coupling for oil well pipe |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: BAOSHAN IRON & STEEL CO., LTD. Free format text: FORMER NAME OR ADDRESS: SHANGHAI BAOSHAN STEEL( GROUP ) CO.,LTD. |
|
| CP03 | Change of name, title or address |
Address after: 201900, Fujin Road, Shanghai, Baoshan District orchard Patentee after: Baoshan Iron & Steel Co., Ltd. Address before: 200122 No. 1, middle front road, Baoshan District Shanghai factory Patentee before: Shanghai Baosteel (Group) Company |
|
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |