CN2522610Y - Oil well casing special nipple connecting piece - Google Patents
Oil well casing special nipple connecting piece Download PDFInfo
- Publication number
- CN2522610Y CN2522610Y CN 02218263 CN02218263U CN2522610Y CN 2522610 Y CN2522610 Y CN 2522610Y CN 02218263 CN02218263 CN 02218263 CN 02218263 U CN02218263 U CN 02218263U CN 2522610 Y CN2522610 Y CN 2522610Y
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- sealing
- torque step
- thread
- moment
- sealing surface
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- Expired - Lifetime
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Abstract
The utility model belongs to an oil well pipeline connecting piece and specifically provides a special thread pipeline connecting piece. The main technical proposal is that a thread section, a main torque step and a torque step are orderly arranged on a matching surface of an internal and external thread pieces; a spherical sealing surface and an oblique sealing surface match each other and are orderly arranged between the main torque step and the torque step of the internal and external thread pieces. The connecting piece is a double-torque step consisting of the main torque step and the torque step; the thread uses an API partial trapezoidal screw thread; sealing uses the oblique surface, the spherical surface, a cylindrical hole and a cylindrical surface to seal. As shown in Figure 1, because the main torque step is quite close to a cylindrical sealing surface, the main torque step forms a protective barrier for the cylindrical sealing surface so that the cylindrical sealing surface is not easily damaged in transportation process; therefore, at least one sealing surface of the device is safe and can reliably plays the sealing role.
Description
Technical field
The utility model belongs to the pipe joint that a kind of oil well uses, specifically a kind of union of special thread.
Background technology
The existing in the world kind more than 100 of oil well pipe special thread joint connector, its basic structure is by connecting thread, and 3 parts such as moment of torsion step, metal-metal interference sealing surface are formed.
Screw thread wherein is generally flat bodily form screw thread or improved flat bodily form thread forms, and its spigot surface angle is generally 0 °～60 °, and the bearing surface angle is generally at-30 °～20 °; The moment of torsion step is generally 0 °～15 ° end face; The metal to metal seal face is metal and metal interference fit, is generally inclined-plane/inclined-plane, inclined-plane/sphere.This sealing means can produce the magnitude of interference and reduce when being subjected to axial tension load, and contact stress descends, and the sealing performance of sealing surface is descended.
Also have seal form such as cylindrical hole/sphere, cylindrical hole/face of cylinder in addition.Do not reduce though this seal form when being subjected to axial tension load, can not produce the magnitude of interference, thereby contact stress is descended, because the contact length of this sealing surface is very short, contact stress is very high, is easy to generate the thread gluing of sealing surface.
Above male thread sealing surface is all damaged in process, transportation and use easily, the sealing performance of infringement sealing surface, the difficulty that has increased processing, transportation and used.
Technology contents
The purpose of this utility model is a kind of oil well pipe special thread joint connector of design, to improve screw element sealing integrity in use, makes screw element still have excellent sealing performance under tensile load, avoids sealing surface to damage in carrying simultaneously.
Its main technical schemes is thread segment to be set and the moment of torsion step that is positioned at the fitting face end on the fitting face of internal and external screw thread spare respectively, it is characterized in that being provided with on the fitting face between thread segment and moment of torsion step main moment of torsion step.
Ball face sealing face and the inclined-plane sealing surface that cooperatively interacts is being set respectively on the fitting face of internal and external screw thread spare, between main moment of torsion step and moment of torsion step, between the main moment of torsion step of inner thread piece and inclined-plane sealing, the cylindrical hole sealing surface is set, between the main moment of torsion step of external thread piece and ball face sealing, is provided with column sealed.Wherein cylindrical hole sealing surface and column sealed face cooperatively interact.
Between the cross section of the end face of moment of torsion step and connector, angle α is arranged.
The utility model has the advantages that because the sealing surface of joint internal and external threads has adopted inclined-plane-sphere+cylindrical hole-face of cylinder seal form, overcome the incomplete shortcoming of sealing performance that only exists in the present screw thread design with single metallic seal form such as inclined-plane-inclined-plane, inclined-plane-sphere, cylindrical hole-sphere, cylindrical hole-face of cylinder, made full use of the advantage of various seal form, made the sealing performance of special thread of the present utility model under various load, keep good state.
The form of this joint is that main moment of torsion step and moment of torsion step constitute two moment of torsion steps; screw thread adopts the API buttress thread; inclined-plane-sphere+cylindrical hole-face of cylinder sealing is adopted in sealing; as shown in Figure 1; very near because of main moment of torsion step and column sealed face, main moment of torsion step has just become column sealed protection barrier, makes column sealed to be not easy to damage in transportation; thereby this device to have a sealing surface at least be safe, it plays sealing function reliably.
When on sealing surface, detaining, when being compressed or tensile load, when the contact stress of inclined-plane-sphere rises (or decline), the contact stress of cylindrical hole-column sealed can descend automatically (or rise), played the effect of regulating, thereby the contact stress of two sealing surfaces is complemented one another, and then reach good sealing effectiveness.
Description of drawings
Fig. 1 is the structure chart of the utility model external thread piece.
Fig. 2 is the structure chart of the utility model inner thread piece.
The specific embodiment
As shown in the figure: thread segment 5,5 ' and be positioned at the moment of torsion step 4,4 ' of fitting face end is set respectively on the fitting face of internal and external screw thread spare 7,6, thread segment 5,5 ' and moment of torsion step 4,4 ' between fitting face on main moment of torsion step 1,1 ' is set.Thread segment on the internal and external screw thread spare 7,6 is used to interconnect, and moment of torsion step 4,4 ' wherein is used for sealing.
On the fitting face of internal and external screw thread spare 7,6, main moment of torsion step 1,1 ' and moment of torsion step 4,4 ' between the inclined-plane sealing surface 3 and ball face sealing face 3 ' that cooperatively interacts is set respectively.Utilization is positioned at cooperatively interacting of inclined-plane sealing 3 and ball face sealing 3 ' on the internal and external threads spare 7,6, can prolong the face that is sealed and matched of internal and external threads spare, improves its sealing effectiveness.
At the main moment of torsion step 1 of inner thread piece 7 and 3 of inclined-plane sealings cylindrical hole sealing surface 2 is set, between the main moment of torsion step 1 ' of external thread piece 6 and ball face sealing 3 ', is provided with column sealed 2 '.Utilize cylindrical hole sealing surface 2 and column sealed 2 ' cooperate, form the 2nd road fitted seal,, further improve sealing effectiveness to guarantee the reliable and stable of hermetically-sealed construction.
Between the cross section of moment of torsion step 4,4 ' end face and connector, angle α is arranged.This angle can be between 0 °～15 °, utilize the end face of this inclination to guarantee the reliability that seals.
Claims (5)
1, oil well pipe special thread joint connector is provided with thread segment and the moment of torsion step that is positioned at the fitting face end respectively on the fitting face of internal and external screw thread spare, it is characterized in that being provided with on the fitting face between thread segment and moment of torsion step main moment of torsion step.
2, connector according to claim 1 is characterized in that ball face sealing face and the inclined-plane sealing surface that cooperatively interacts is being set respectively on the fitting face of internal and external screw thread spare, between main moment of torsion step and moment of torsion step.
3, connector according to claim 1 and 2 is characterized in that between the main moment of torsion step of inner thread piece and inclined-plane sealing the cylindrical hole sealing surface being set.
4, connector according to claim 1 and 2 is characterized in that being provided with column sealed between the main moment of torsion step of external thread piece and ball face sealing.
5, connector according to claim 1 is characterized in that between the cross section of the end face of moment of torsion step and connector angle α being arranged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02218263 CN2522610Y (en) | 2002-01-08 | 2002-01-08 | Oil well casing special nipple connecting piece |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02218263 CN2522610Y (en) | 2002-01-08 | 2002-01-08 | Oil well casing special nipple connecting piece |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2522610Y true CN2522610Y (en) | 2002-11-27 |
Family
ID=33696939
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02218263 Expired - Lifetime CN2522610Y (en) | 2002-01-08 | 2002-01-08 | Oil well casing special nipple connecting piece |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2522610Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100545498C (en) * | 2003-05-30 | 2009-09-30 | 瓦卢莱克曼内斯曼油气法国公司 | The threaded pipe of band progressive axial thread interference connects |
| CN102597599A (en) * | 2009-09-02 | 2012-07-18 | 住友金属工业株式会社 | Protector for threaded joint for pipe |
| CN104060946A (en) * | 2013-03-21 | 2014-09-24 | 宝山钢铁股份有限公司 | Ultrahigh torsion-resistance metal airtight drill rod joint |
| CN105221081A (en) * | 2015-10-30 | 2016-01-06 | 陕西延长石油(集团)有限责任公司研究院 | A kind of elastic packing helicitic texture |
| CN107355185A (en) * | 2017-07-26 | 2017-11-17 | 无锡西姆莱斯石油专用管制造有限公司 | A kind of antitorque joint of double step |
-
2002
- 2002-01-08 CN CN 02218263 patent/CN2522610Y/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100545498C (en) * | 2003-05-30 | 2009-09-30 | 瓦卢莱克曼内斯曼油气法国公司 | The threaded pipe of band progressive axial thread interference connects |
| CN102597599A (en) * | 2009-09-02 | 2012-07-18 | 住友金属工业株式会社 | Protector for threaded joint for pipe |
| CN102597599B (en) * | 2009-09-02 | 2014-07-23 | 住友金属工业株式会社 | Protector for threaded joint for pipe |
| CN104060946A (en) * | 2013-03-21 | 2014-09-24 | 宝山钢铁股份有限公司 | Ultrahigh torsion-resistance metal airtight drill rod joint |
| CN105221081A (en) * | 2015-10-30 | 2016-01-06 | 陕西延长石油(集团)有限责任公司研究院 | A kind of elastic packing helicitic texture |
| CN105221081B (en) * | 2015-10-30 | 2017-08-01 | 陕西延长石油(集团)有限责任公司研究院 | A kind of elastic packing helicitic texture |
| CN107355185A (en) * | 2017-07-26 | 2017-11-17 | 无锡西姆莱斯石油专用管制造有限公司 | A kind of antitorque joint of double step |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20120108 Granted publication date: 20021127 |