CN2886276Y - Anti-compression and anti-bending hook took screw thread connection structure - Google Patents
Anti-compression and anti-bending hook took screw thread connection structure Download PDFInfo
- Publication number
- CN2886276Y CN2886276Y CN 200620025942 CN200620025942U CN2886276Y CN 2886276 Y CN2886276 Y CN 2886276Y CN 200620025942 CN200620025942 CN 200620025942 CN 200620025942 U CN200620025942 U CN 200620025942U CN 2886276 Y CN2886276 Y CN 2886276Y
- Authority
- CN
- China
- Prior art keywords
- thread
- torque shoulder
- connection structure
- internal
- hook tooth
- 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
Images
Abstract
The utility model offers a hook-tooth threaded connection structure with compression resistance and bending resistance, including a coupling B with inner thread at its two ends, a tapered sealing surface, and a torque shoulder, and a bushing A with outer thread at its two ends, a tapered sealing surface, and a torque shoulder. The outer thread at the ends of the bushing A and the inner thread at the end of the coupling B are screwed tightly via the hook-tooth thread. The D section of the inner thread at the end of the coupling B has an inner torque shoulder and an inner tapered sealing surface; the C section of the outer thread at the ends of the bushing A with an outer torque shoulder and an outer tapered sealing surface. The inner torque shoulder and the inner tapered sealing surface inside the coupling are contacted with the outer torque shoulder and the outer tapered sealing surface. Salutary effect of the hook-tooth threaded connection structure is that it has better property in the case of high compression and high bending load and its inner compressing resistance and outer crushing resistance are all could be equal as that of the tube body; it could get the optimal primary sealing surface of when metal is sealed with another metal, to get a better and a more reliable sealing performance, so the non-leakage of the gas in high pressure and high bending could be realized.
Description
Technical field
The utility model relates to the seal for pipe joints linkage structure, and particularly a kind of incompressible and resistant to bending hook tooth screw connection structure is more suitable for big deviated well, the horizontal well petroleum casing pipe screw connection structure of oil field special requirement.
Background technique
More than 300 in the land existing oil field of China, gas field more or less a hundred has formed many oil gas wells production base.The deeply buried reservoir degree is about 1000m ~ 7000m.Exploiting the used OCTG of these petroleum resourceses is sleeve pipe and oil pipe.General designation such as sleeve pipe, oil pipe and drilling rod oil well pipe, oil well pipe connects into the long tubing string of thousands of rice by special screw thread during military service.Tubing string will bear the effect of compound stresses such as stretching, compression, bending, interior pressure, external pressure and thermal cycle for a long time in different well sections, service condition is very abominable, and screw connection point is the weakest link of whole oil well pipe generally speaking.
Oil well pipe thread should possess two characteristics: 1) structural integrity; 2) sealing integrity.Structural integrity requires: will possess after the thread engagement enough join strengths are arranged, be unlikely under the effect of external force structure to be damaged.Sealing integrity requires: the tubing string of to guarantee to contain hundreds of thread connecting joints bears the long term of inside and outside differential pressure (being generally a hundreds of barometric pressure) and does not leak under various external force states.The intensity that is threaded and sealing are two very important technical orders of tubing and casing.
At present, in general API tubing and casing standard series, employing be mostly short round thread, oval screw thread, buttress thread.In the problem that all exists aspect structural integrity that ensures tubing string and the sealing integrity separately.As the round thread tubing string: good airproof performance is in buttress thread, but its screw connection point can only bear 60%～80% the tension load that is equivalent to body intensity; The join strength of buttress thread is better than the round thread tubing string, but the thread seal performance is lower, and seal-air pressure generally is no more than 28MP.In order to remedy the inborn deficiency of above-mentioned flute profile self, people design some special threads again and connect; As: utilize the high advantage of buttress thread join strength, D section and C section at its box cupling and sleeve pipe taper thread increase by one group of sealing cone that cooperatively interacts, and the method that torque shoulder arranged in the Position Design of closing on conical seal (contact) face is to remedy the deficiency of its thread seal poor-performing.But minimizing gradually along with occurring in nature oil, gas resource, the exploitation difficulty is increasing, and above-mentioned way far can not adapt to some high-pressure oil-gas well fully, especially high incompressible, resistance to bending, the technical requirements of big deviated well, horizontal well, they are difficult to finish the use of bad ground oil gas well.So the tubing and casing of domestic oil field specific use still needs a large amount of imports.
Summary of the invention
For solving the problem that exists in the above-mentioned technology, the purpose of this utility model provides a kind of incompressible and resistant to bending hook tooth screw connection structure, satisfy the technical requirements of big deviated well, horizontal well simultaneously, the sleeve pipe and the oil pipe of the hook tooth screw connection structure of the high sealing performance of no gas leakage under the composite load situation.
For achieving the above object, the technical solution adopted in the utility model provides a kind of incompressible and resistant to bending hook tooth screw connection structure, wherein: it includes the box cupling that two ends have internal thread and conical seal (contact) face and torque shoulder, also has two sleeve pipes that have outside thread and conical seal (contact) face and torque shoulder respectively to connect to form; Cannula tip is that outside thread and box cupling end internal thread are screwed, and the D section of box cupling end internal thread is provided with interior sealing cone, is provided with the internal torque shoulder in the end of interior sealing cone; The outside thread C section of described cannula tip is provided with the external sealed conical surface, torque shoulder outside the externally threaded C section of cannula tip is provided with, and the interior sealing cone of box cupling end internal thread and internal torque shoulder contact with the sleeve pipe outside thread external sealed conical surface and outer torque shoulder; Described internal thread and outside thread constitute by the hook tooth screw thread.
The tooth form of described hook tooth screw thread is the hook tooth flute profile, and its approaching face angle is 20 °, and the supporting plane angle is-4 °, and angle of thread is 16 °.
The tooth depth of described internal thread is 1.675mm, and externally threaded tooth depth is 1.575mm; Half tooth depth of internal and external threads is set to asymmetric.
Be set to have the sealing cone of sealing shoulder respectively in the D of described internal and external threads section and C section.
The internal torque shoulder of described internal thread and externally threaded outer torque shoulder are 15 ° of angles.
The interior sealing cone of described internal thread and the angle of the externally threaded external sealed conical surface are 40 °, form the sealing of the metal to metal of box cupling and sleeve pipe.
The beneficial effects of the utility model are characteristics of this hook tooth molded cannula screw connection structure:
1, its approaching face angle of hook tooth flute profile is 20 °, and the supporting plane angle is-4 °; Be different from normally used trapezoidal partially flute profile, the approaching face angle is 10 °, and the supporting plane angle is 3 °.All having preferable performance, internal pressure strength and collapse resistance all can reach with body under this hook tooth inipple structure is carried outside high compression and high bending is equal to.
2, the tooth depth of internal thread is slightly higher than outside thread tooth depth, and half tooth depth of internal and external threads is an asymmetric, is different from the 1/2 place position of the effective diameter of thread line of buttress thread in the API standard in the screw thread tooth depth.Because footpath contact points in the internal and external threads is designed in identical tooth depth position, then will inevitably produce a gap with the outside thread tooth top at the bottom of the internal thread tooth, this gap is that the pressure that the dope that oil well pipe was coated with (or being called thread compound) is produced provides a passage, its pressure is released, to reduce influence to tubing string; Avoid the generation of screw thread thread gluing phenomenon simultaneously.
3, for optimizing the stress distribution of primary sealing area, the sealing angle of this structure is designed to 40 ° and is metal to metal seal, is different from common 1: 10 sealing tapering.
4, owing to be that the hook tooth screw thread adds the awl structure that is tightly connected, adopt metal to metal seal, made gas sealing ability higher, more reliable, thereby can be implemented in high pressure, high gas under crooked does not leak.
5,, thereby guaranteed that accurate twisting connects the location, also strengthened sealability simultaneously again because the torque shoulder at 15 ° of angles is arranged.
6, adopt this structural design, can reduce the possibility of screw thread generation thread gluing to greatest extent, and improved the antiwear property of screw thread, reduced to twist connecing the back by the adverse effect that dope produced of shutoff.
Description of drawings
Fig. 1 partly cuts open structural representation for box cupling of the present utility model;
Fig. 2 is the I portion enlarged diagram of Fig. 1;
Fig. 3 partly cuts open structural representation for sleeve pipe of the present utility model;
Fig. 4 is the partial enlarged drawing of Fig. 3;
Fig. 5 is box cupling and sleeve pipe internal and external threads attachment portion semi-section schematic representation;
Fig. 6 is the local enlarged diagram of Fig. 5 hook tooth flute profile.
Among the figure:
A, sleeve pipe B, box cupling
1, outside thread 2, internal thread 3, hook tooth flute profile
4, interior sealing cone 5, internal torque shoulder 6, the external sealed conical surface
7, outer torque shoulder
Embodiment
In conjunction with the accompanying drawings incompressible and resistant to bending hook tooth screw connection structure of the present utility model is illustrated.
Shown in Fig. 1-6, it includes the box cupling B that two ends have internal thread and conical seal (contact) face and torque shoulder this incompressible and resistant to bending hook tooth screw connection structure, also has two sleeve A that have outside thread and conical seal (contact) face and torque shoulder respectively to connect to form;
The sleeve A end is that outside thread 1 is screwed with box cupling B end internal thread 2, and the D section of box cupling B end internal thread 2 is provided with interior sealing cone 4, is provided with internal torque shoulder 5 in the end of interior sealing cone 4; The C section of the outside thread 1 of described sleeve A end is provided with the external sealed conical surface 6, torque shoulder 7 outside the C section of sleeve A end outside thread 1 is provided with, the interior sealing cone 4 of box cupling B end internal thread 2 and internal torque shoulder 5 contact with the C section external sealed conical surface 6 and the outer torque shoulder 7 of outside thread 1; Described internal thread 2 and outside thread 1 constitute by hook tooth flute profile 3.
The sealing angle of the interior sealing cone 4 of internal thread and the outside thread external sealed conical surface 6 is 40 ° among Fig. 2, and the measurement diameter of interior sealing cone 4 is less than the measurement diameter of outside thread external sealed face 6.The measurement diameter of the interior sealing cone 4 and the external sealed conical surface 6 can satisfy the requirement of gas seal according to the tolerance processing of design with the magnitude of interference between the sealing cone 4 in guaranteeing and the external sealed conical surface 6.Internal torque shoulder 5 provides accurate localization, twist connect after, sealing cone 4 and 6 diameter magnitude of interference are in the scope of a designing requirement.Internal torque shoulder 5, outer torque shoulder 7 are designed to 15 ° of corner structures, can strengthen the sealability of the metal to metal of box cupling B and sleeve A.
The helical thread portion of this connection is the hook tooth flute profile owing to what use, when the wall thickness of body during in certain scope, the negative angle of the torque shoulder at 15 ° of angles and hook tooth supporting plane produces a wedge shape effect, strengthened the ability of the anti-external compression power that this hermetic seal is threaded.
Concrete enforcement originally is threaded and adopts following data:
This internal and external threads that is threaded all adopts the screw thread of hook tooth flute profile 3, and the angle of carrying side is that 20 °, the pitch of screw thread are that 5.08mm (along axial direction), the thickness of internal thread 2 on the effective diameter of thread line are that the height of 2.54mm, screw thread is that the tapering of 1.676mm (perpendicular to axis), screw thread is 1: 16 for-4 °, the angle that imports the side; The same screw thread that adopts hook tooth flute profile 3 of outside thread 1, the angle of carrying side is that 20 °, externally threaded tooth depth are that the pitch of 1.575mm (perpendicular to axis), screw thread is that 5.08mm (along axial direction), the thickness of outside thread on the effective diameter of thread line are that the tapering of 2.49mm (along axial direction), screw thread is 1: 16 for-4 °, the angle that imports the side.
For improving wear resistance and the sealability that the hook tooth flute profile is threaded, the tooth depth of internal thread 2 is slightly higher than outside thread tooth depth.Half tooth depth of internal and external threads is an asymmetric, is different from the 1/2 place position of the effective diameter of thread line of API standard in the screw thread tooth depth.It is 0.048mm that internal and external threads imports side minimum clearance, and the maximal clearance is 0.144mm; Internal and external threads tooth root minimum clearance is 0.10mm, and the maximal clearance is 0.15mm.
Claims (6)
1, a kind of incompressible and resistant to bending hook tooth screw connection structure, it is characterized in that: it includes the box cupling (B) that two ends have internal thread and conical seal (contact) face and torque shoulder, also has two sleeve pipes (A) that have outside thread and conical seal (contact) face and torque shoulder respectively to connect to form;
Sleeve pipe (A) end is that outside thread (1) is screwed with box cupling (B) end internal thread (2), and the D section of box cupling (B) end internal thread (2) is provided with interior sealing cone (4), is provided with internal torque shoulder 5 in the end of interior sealing cone (4); Outside thread (1) the C section of described sleeve pipe (A) end is provided with the external sealed conical surface (6), torque shoulder (7) outside the C section of sleeve pipe (A) end outside thread (1) is provided with, the interior sealing cone (4) of box cupling (B) end internal thread (2) and internal torque shoulder (5) contact with sleeve pipe (A) outside thread (1) the external sealed conical surface (6) and outer torque shoulder (7);
Described internal thread (2) and outside thread (1) constitute by hook tooth screw thread (3).
2, incompressible and resistant to bending hook tooth screw connection structure according to claim 1 is characterized in that: the tooth form of described hook tooth screw thread is hook tooth flute profile (3), and its approaching face angle is 20 °, and the supporting plane angle is-4 °, and angle of thread is 16 °.
3, incompressible and resistant to bending hook tooth screw connection structure according to claim 1, it is characterized in that: the tooth depth of described internal thread (2) is 1.675mm, the tooth depth of outside thread (1) is 1.575mm; Half tooth depth of internal and external threads is set to asymmetric.
4, incompressible and resistant to bending hook tooth screw connection structure according to claim 1 is characterized in that: the sealing cone that is set to have sealing shoulder in the D of described internal and external threads section, C section respectively.
6, incompressible and resistant to bending hook tooth screw connection structure according to claim 1, its structure characteristic is: the internal torque shoulder (5) of described internal thread (2) is 15 ° of angles with the outer torque shoulder (7) of outside thread (1).
7, incompressible and resistant to bending hook tooth screw connection structure according to claim 1, it is characterized in that: the angle of the interior sealing cone (4) of described internal thread (2) and the external sealed conical surface (6) of outside thread (1) is 40 °, forms the sealing of the metal to metal of box cupling (B) and sleeve pipe (A).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620025942 CN2886276Y (en) | 2006-04-29 | 2006-04-29 | Anti-compression and anti-bending hook took screw thread connection structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620025942 CN2886276Y (en) | 2006-04-29 | 2006-04-29 | Anti-compression and anti-bending hook took screw thread connection structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2886276Y true CN2886276Y (en) | 2007-04-04 |
Family
ID=37961366
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620025942 Expired - Lifetime CN2886276Y (en) | 2006-04-29 | 2006-04-29 | Anti-compression and anti-bending hook took screw thread connection structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2886276Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101871324A (en) * | 2010-07-09 | 2010-10-27 | 天津钢管集团股份有限公司 | Connecting structure of special high-pressure completion oil pipe |
| CN102900378A (en) * | 2012-09-05 | 2013-01-30 | 中国石油天然气集团公司 | Connecting structure of steel joint and aluminium alloy drill pipe body |
| CN108166937A (en) * | 2018-03-07 | 2018-06-15 | 上海海隆石油管材研究所 | High torque highly anti-fatigue type nipple |
-
2006
- 2006-04-29 CN CN 200620025942 patent/CN2886276Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101871324A (en) * | 2010-07-09 | 2010-10-27 | 天津钢管集团股份有限公司 | Connecting structure of special high-pressure completion oil pipe |
| CN102900378A (en) * | 2012-09-05 | 2013-01-30 | 中国石油天然气集团公司 | Connecting structure of steel joint and aluminium alloy drill pipe body |
| CN108166937A (en) * | 2018-03-07 | 2018-06-15 | 上海海隆石油管材研究所 | High torque highly anti-fatigue type nipple |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101063502A (en) | Anticompress and anti-bending shouldered hook-shape teeth screwed connection structure | |
| CN1653289A (en) | Threaded pipe joint | |
| CN202338212U (en) | Continuous oil pipe connector | |
| CN103238017B (en) | A kind of sealing of improvement of pipeline enclosure | |
| CN203531777U (en) | High-quality airtight seal oil casing threaded joint | |
| CN202039782U (en) | Anti-bending casing pipe threaded connection structure | |
| CN203175422U (en) | Quick airtight casing thread connector | |
| CN101696621B (en) | Air-tight seal screw joint | |
| CN2886276Y (en) | Anti-compression and anti-bending hook took screw thread connection structure | |
| CN201198739Y (en) | Petroleum drill rod joint with higher anti-twisting strength | |
| CN200971757Y (en) | High seal buttless thread double-pipe connection structure | |
| CN201013257Y (en) | Oil pipe coupling | |
| CN201322147Y (en) | Connection structure for small-clearance collar and casing threads | |
| CN102852466B (en) | Special buttress thread oil sleeve connecting joint | |
| CN203403832U (en) | Air-tight seal screwed joint | |
| CN201756921U (en) | Coupling-free petroleum casing pipe with variable-pitch buttress threads | |
| CN200968455Y (en) | Double shoulder arc-to-cone sealed tube screwed connection structure | |
| CN102926674B (en) | Low pressure air-sealed special threaded joint | |
| CN2743655Y (en) | Connecting structure of full even diameter straight joining type casing thread | |
| CN203403831U (en) | Direct-connecting oil casing pipe threaded connector | |
| CN205936433U (en) | Oil conduit screw connection structure | |
| CN2747352Y (en) | Integral coupled petroleum sleeve joint with metal interference | |
| CN201412077Y (en) | Negative-buckle threaded sleeve similar to trapezoid | |
| CN2933676Y (en) | Cutting tool for manufacturing hook type teeth screw | |
| CN201513641U (en) | Bending resistant anti-compression low contact stress oil sleeve threading connector |
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: TIANJIN STEEL TUBE GROUP CO., LTD. Free format text: FORMER NAME OR ADDRESS: TIANJIN STEEL PIPE GROUP CO., LTD. |
|
| CP03 | Change of name, title or address |
Address after: 300301 Jintang Road, Dongli District, Tianjin Patentee after: Tianjin Steel Pipe Group Co., Ltd. Address before: 300301 Jintang Road, Dongli District, Tianjin Patentee before: Tianjin Pipe (Group) Corp. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20070404 |
|
| EXPY | Termination of patent right or utility model |