CN202215158U - High-performance oil-casing-pipe screwed joint structure - Google Patents
High-performance oil-casing-pipe screwed joint structure Download PDFInfo
- Publication number
- CN202215158U CN202215158U CN2011201187981U CN201120118798U CN202215158U CN 202215158 U CN202215158 U CN 202215158U CN 2011201187981 U CN2011201187981 U CN 2011201187981U CN 201120118798 U CN201120118798 U CN 201120118798U CN 202215158 U CN202215158 U CN 202215158U
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- box cupling
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- 238000013461 design Methods 0.000 claims abstract description 28
- 238000007789 sealing Methods 0.000 abstract description 19
- 230000000694 effects Effects 0.000 abstract description 4
- 238000005452 bending Methods 0.000 abstract description 3
- 230000008878 coupling Effects 0.000 abstract 4
- 238000010168 coupling process Methods 0.000 abstract 4
- 238000005859 coupling reaction Methods 0.000 abstract 4
- 239000007789 gas Substances 0.000 description 7
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 239000003208 petroleum Substances 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002343 natural gas well Substances 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
Abstract
The utility model provides a high-performance oil-casing-pipe screwed joint structure, which is formed by screwing and twisting a casing pipe with external threads at the end portion and a coupling with internal threads. The external threads of the end portion of the casing pipe and the internal threads of the coupling are negative-angle taper threads and are designed in a tooth-side interference manner. A torque stop shoulder is arranged on the internal threads of the coupling. The utility model has the effects that though the simultaneous adoption of the negative-angle thread design and the tooth-side interference design, the thread structure design is optimized, the stability of the sealing performance of a sealing surface under tensioning and compressing loads is improved, and an oil casing pipe can be better used under extreme conditions. Due to the enhancement of the tensioning and compressing performance, the anti-bending performance is also increased. The torque stop shoulder is added on the coupling at a corresponding position, guaranteeing the screw-on position. In this way, the connecting efficiency of the joint is guaranteed to be maximal, and the compressing performance is guaranteed to be optimal.
Description
Technical field
The utility model patent relates to a kind of syndeton of screw thread, particularly a kind of high-performance oil casing pipe screw joint structure.
Background technology
The tubing and casing tubing string adopts screw thread that single oil well pipe is formed by connecting, and the screw connection point of tubing string is weak key link.In general API standard, sleeve pipe adopts round thread or buttress thread type of attachment.These types of attachment are guaranteeing all there is certain problem aspect tubular column structure integrality and the sealing integrity.Its intensity that is threaded of round thread sleeve pipe only is 60%～80% of body intensity, though the bonding strength of buttress thread near or to reach body intensity gas sealing ability not enough.The hydrogen sulfide acid ingredient that contains in the oil gas in addition can make common API sleeve pipe that stress corrosion slowly takes place, and causes sleeve pipe deformation failure in long-term use.
Along with the development of petroleum industry, especially the exploitation of deep-well, ultradeep well, high-pressure gas well, directional well, sour environment well is had higher requirement to the functional performance of petroleum casing pipe, and the design of sleeve pipe pipe string is also more and more diversified.Sleeve pipe with API standard thread type of attachment is difficult to satisfy the production demand in many cases, connects so develop various types of special threads abroad.These special threads connections receive the popular welcome in oil field with its reliable gas sealing ability, higher bonding strength, good anti-stick button and special design targetedly.China has introduced the special thread splicing sleeve in the eighties in the exploitation of deep-well, ultradeep well and the natural gas well, obtained effect preferably.But in application, also brought relevant problem.As: import cost is higher; Special thread connects maintenance and annex processing difficulties thereof.These have all limited the use of special retaining ring pipe.
Along with oil-gas field development under the extreme condition is more and more, also increasingly high to the requirement of oil casing threaded joint, the special thread joint also need possess excellent sealing performance under extreme environment and combined load except needs satisfy the switching performance of joint.These extreme environments and combined load comprise the macrobending angle, the fluctuating load of stretching and compression etc.The special thread joint needs that satisfy these extreme environments possess in the stability of stretching with the sealing performance of compressive load lower sealing surface.The negative angle screw thread design can provide the stability of tensile load lower sealing surface sealing performance; And flank interference design can provide the stability of compressive load lower sealing surface sealing performance, in present all screw thread design all is to adopt negative angle screw thread design or flank interference design separately.
Summary of the invention
To the deficiency of structure in the prior art, the utility model provides a kind of high-performance oil casing pipe screw joint structure, has comprehensively adopted negative angle screw thread design and flank interference design, to improve in the stability of stretching with compressive load lower sealing surface sealing performance.
For realizing above-mentioned purpose; The technical scheme that the utility model adopts provides a kind of high-performance oil casing pipe screw joint structure; This structure comprises that an end has externally threaded sleeve pipe and is screwed with the box cupling that has an internal thread and forms, and wherein: the external screw thread of said cannula tip and the internal thread of box cupling are the negative angle taper thread, and screw thread design is the flank interference; Establish only torque shoulder on the internal thread of said box cupling, the public female end endoporus of the joint that is screwed is concordant.
The flute profile of said negative angle taper thread is: screw thread design is the flank interference, and the load side angle is-2 °～-5 °, and the pitch of flute profile is per inch three teeth～six teeth, and tapering is 1: 16～1: 7, and the external screw thread tooth depth is 2mm～4mm, and the internal thread tooth depth is 2mm～4mm.
The torque shoulder of ending on the internal thread of said box cupling is to confirm the straight shoulder of position on the buckle, and the axis angle of this shoulder and sleeve pipe is 10 °～20 °, and the public female end endoporus of the joint that is screwed is concordant.
The flank interference of said screw thread design is axial magnitude of interference 5mm～25.4mm.
The effect of the utility model is through adopting negative angle screw thread design and flank interference design simultaneously, optimize the helicitic texture design, improved in the stability of stretching with the sealing performance of compressive load lower sealing surface, being more conducive to tubing and casing use under extreme conditions.Because stretching and compression performance improve, and bending resistance is strengthened to some extent, because stretching and compression performance improve, bending resistance is strengthened to some extent, increased in the box cupling relevant position and ended torque shoulder, to guarantee the position on the buckle.Guarantee the joint efficiency maximization of joint and the optimization of compression performance.The concordant design of public female end endoporus makes oil gas in transport process, turbulent phenomenon can not take place, and reduces transport resistance.
Description of drawings
Fig. 1 is the high-performance sleeve pipe air-tight seal screw joint structural representation of the utility model;
Fig. 2 is the syndeton screw thread flank interference enlarged drawing of the utility model.
A, sleeve pipe B, box cupling C, external screw thread D, end torque shoulder
The specific embodiment
In conjunction with accompanying drawing and embodiment the high-performance oil casing pipe screw joint structure of the utility model is explained.
The high-performance oil casing pipe screw joint structure of the utility model; This structure comprises that an end has externally threaded sleeve pipe and is screwed with the box cupling that has an internal thread and forms; The external screw thread of said cannula tip and the internal thread of box cupling are the negative angle taper thread; Screw thread design is the flank interference, establishes only torque shoulder on the internal thread of said box cupling, and the public female end endoporus of the joint that is screwed is concordant.
The flute profile of said negative angle taper thread is: screw thread design is the flank interference, and the load side angle is-2 °～-5 °, and the pitch of flute profile is per inch three teeth～six teeth, and tapering is 1: 16～1: 7, and the external screw thread tooth depth is 2mm～4mm, and the internal thread tooth depth is 2mm～4mm.The flank interference of said screw thread design is axial magnitude of interference 5mm～25.4mm.
The torque shoulder of ending on the internal thread of said box cupling is to confirm the straight shoulder of position on the buckle, and the axis angle of this shoulder and sleeve pipe is 10 °～20 °, and the public female end endoporus of the joint that is screwed is concordant.
The flank interference of said screw thread design is axial magnitude of interference 5mm～25.4mm; This structure comprises that an end has externally threaded sleeve pipe and is screwed with the box cupling that has an internal thread and forms; The negative angle taper thread that the external screw thread of said cannula tip and the internal thread of box cupling are; Screw thread design is the flank interference, and the flank interference is axial magnitude of interference 5mm～25.4mm.
The high-performance oil casing pipe screw joint structure of the utility model is achieved in that
Like Fig. 1, shown in 2, this petroleum sleeve joint structure comprises sleeve A and box cupling B two parts composition, and said sleeve A part is by external screw thread C, and said box cupling B part connects between two sleeve pipes, and the both sides symmetrical configuration comprises internal thread and ends torque shoulder D.
The tooth form angle of said external screw thread C is 16 °, and wherein bearing surface α 1 is-4 °, and approaching face α 2 is 20 °; According to the difference of external diameter specification, the external screw thread tooth depth is 2.16mm, and the internal thread tooth depth is 2.36mm; Pitch is respectively t=5.08mm, and thread taper 1: 16, screw thread are the flank interference.The tooth form angle of said internal thread, approaching face angle, bearing surface angle, pitch, tapering are all consistent with external screw thread.
One side of box cupling B was twisted with body earlier and is received the position before sleeve A was dispatched from the factory, and was transported to the oil field, twisted to connect with another root sleeve pipe again in the time of need going into the well and went into the well, and formed airtight casing string until the dark oil recovery gas-bearing formation of several kms.Connect in the button process stubborn, sleeve A and box cupling B are screwed, and external screw thread C on the sleeve A and the internal thread C on the box cupling B screw and be combined together until beginning to take place interference, produce certain contact stress.
But, therefore can not accomplish sealing owing at the bottom of internal and external threads tooth top and the tooth certain gap is arranged.Then because the sealing surface portion branch of sleeve A and box cupling B begins to contact and generation interference and reach the effect of sealing.At last when the ending torque shoulder D and contact of sleeve A and box cupling B, screw moment of torsion and stop automatically screwing when fast rise arrives the torque value of design immediately, for the stubborn accurately location that connects is provided between sleeve A and the box cupling B.This moment, sleeve A and box cupling B can guarantee that bonding strength meets or exceeds body intensity, can be not earlier when pressure or external pressure in receiving and body leak.Then, transfer the last buckle that tubing string is proceeded next root sleeve pipe.
Claims (4)
1. high-performance oil casing pipe screw joint structure, this structure comprise that an end has externally threaded sleeve pipe and is screwed with the box cupling that has internal thread and forms, and it is characterized in that:
The external screw thread of said cannula tip and the internal thread of box cupling are the negative angle taper thread, and screw thread design is the flank interference, establish only torque shoulder on the internal thread of said box cupling, and the public female end endoporus of the joint that is screwed is concordant.
2. high-performance oil casing pipe screw joint structure according to claim 1; It is characterized in that: the flute profile of said negative angle taper thread is: screw thread design is the flank interference; The load side angle is-2 °～-5 °, and the pitch of flute profile is per inch three teeth～six teeth, and tapering is 1: 16～1: 7; The external screw thread tooth depth is 2mm～4mm, and the internal thread tooth depth is 2mm～4mm.
3. high-performance oil casing pipe screw joint structure according to claim 1; It is characterized in that: the torque shoulder of ending on the internal thread of said box cupling is to confirm the straight shoulder of position on the buckle; The axis angle of this shoulder and sleeve pipe is 10 °～20 °, and the public female end endoporus of the joint that is screwed is concordant.
4. high-performance oil casing pipe screw joint structure according to claim 1 is characterized in that: the flank interference of said screw thread design is axial magnitude of interference 5mm～25.4mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201187981U CN202215158U (en) | 2011-04-21 | 2011-04-21 | High-performance oil-casing-pipe screwed joint structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201187981U CN202215158U (en) | 2011-04-21 | 2011-04-21 | High-performance oil-casing-pipe screwed joint structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202215158U true CN202215158U (en) | 2012-05-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201187981U Expired - Lifetime CN202215158U (en) | 2011-04-21 | 2011-04-21 | High-performance oil-casing-pipe screwed joint structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202215158U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101899953A (en) * | 2010-08-16 | 2010-12-01 | 天津钢管集团股份有限公司 | Thread joint structure for high-performance oil casing |
-
2011
- 2011-04-21 CN CN2011201187981U patent/CN202215158U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101899953A (en) * | 2010-08-16 | 2010-12-01 | 天津钢管集团股份有限公司 | Thread joint structure for high-performance oil casing |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20190704 Address after: No. 396 Jintang Highway, Dongli District, Tianjin 300301 Patentee after: Tianjin Steel Tube Manufacturing Co., Ltd. Address before: No. 396 Jintang Highway, Dongli District, Tianjin 300301 Patentee before: Tianjin Steel Pipe Group Co., Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120509 |