CN201763267U - Anti-bending oil sleeve threaded connection structure - Google Patents
Anti-bending oil sleeve threaded connection structure Download PDFInfo
- Publication number
- CN201763267U CN201763267U CN2010202510557U CN201020251055U CN201763267U CN 201763267 U CN201763267 U CN 201763267U CN 2010202510557 U CN2010202510557 U CN 2010202510557U CN 201020251055 U CN201020251055 U CN 201020251055U CN 201763267 U CN201763267 U CN 201763267U
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- Prior art keywords
- thread
- connection structure
- box cupling
- threaded connection
- threads
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- Expired - Lifetime
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- 238000005452 bending Methods 0.000 title claims abstract description 23
- 238000007789 sealing Methods 0.000 claims description 9
- 239000011148 porous material Substances 0.000 claims description 2
- 238000013461 design Methods 0.000 abstract description 12
- 230000008878 coupling Effects 0.000 abstract description 4
- 238000010168 coupling process Methods 0.000 abstract description 4
- 238000005859 coupling reaction Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 3
- 230000006835 compression Effects 0.000 abstract description 2
- 238000007906 compression Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 239000003208 petroleum Substances 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000000203 mixture Substances 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
- 239000010959 steel Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- Earth Drilling (AREA)
- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
Abstract
The utility model provides an anti-bending oil sleeve threaded connection structure, which includes a sleeve with external threads at an end and a coupling with internal threads, wherein the sleeve is screwed with the coupling in a rotation manner, both the external threads of the sleeve and the internal threads of the coupling are negative angle conical threads, and a torsion shoulder is arranged on the internal threads. The thread form angle of negative angle conical threads ranges from 15 degrees to 28 degrees, the angel of the guide surface ranges from 20 degrees to 30 degrees, the angle of the bearing surface ranges from minus 2 degrees to minus 5 degrees, the tooth-type pitch is three teeth to six teeth for each inch, the taper ranges from 1:16 to 1:7, the tooth height of male threads ranges from 2 mm to 4 mm, and the tooth height of female threads ranges from 2 mm to 4 mm. The threaded connection structure has the effects as follows: the connection structure improves the bending property of oil sleeves, and facilitates the descent of oil sleeve strings and conduction of well cementation; since the optimized mesopore design and the screw thread form design are adopted, the compression resistance property and the tensile property are improved, and the bending resistance performance is improved; and leveled inner holes at male and female ends can avoid turbulence phenomenon in the conveying process of oil gas and reduce the conveying resistance.
Description
Technical field
The utility model relates to a kind of resistant to bending oil casing threaded connection structure.
Background technology
The tubing and casing tubing string adopts screw thread that single oil well pipe is connected in sequence, 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 connect the popular welcome that is subjected to the 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.Special buckle product accounts for more than 1/2, along with the great development that adds of petroleum resources, and the continuous deterioration of mining environment, the demand of special buckle product can be increasing, and is also more and more higher to the performance requirement of special snapping head.Some special hole conditions, as extended reach well etc., the bending property of butt joint is had higher requirement, and needs to improve the bending property of joint.There are resistant to bending special snapping head in VAM and Tener (company) at present, the technology that its design has all adopted pipe end to close up.
Summary of the invention
The purpose of this utility model provides a kind of resistant to bending oil casing threaded connection structure, to improve bending property, increases joint efficiency, and possess good sealing effectiveness under harsh conditions.
For achieving the above object, the technical solution adopted in the utility model provides a kind of resistant to bending oil casing threaded connection structure, this structure comprises that an end has externally threaded tubing and casing and is screwed with the box cupling that has internal thread, wherein: the external screw thread of described sleeve pipe and the internal thread of box cupling are the negative angle taper thread, the internal thread of described box cupling is provided with only torque shoulder, and the diameter of the mesopore of box cupling is greater than the internal diameter of tubing and casing.
Effect of the present utility model is the bending property that the relevant parameter design of this structure can improve joint, its angle of bend can be expressed as * * °/30m, wherein * * be angle of bend, far above ISO 13679 settings.Show all that through finite element analysis and verification experimental verification take place under the angle of bend of surrender in corresponding specification and steel grade oil casing joint, the joint sealing face still keeps excellent sealing performance.
Description of drawings
Fig. 1 is the structural representation of syndeton of the present utility model;
Fig. 2 is the form of thread enlarged diagram of syndeton of the present utility model;
Fig. 3 is the only torque shoulder enlarged diagram of syndeton of the present utility model.
Among the figure:
A, sleeve pipe B, box cupling
C, screw thread D, end torque shoulder
The specific embodiment
Reaching embodiment in conjunction with the accompanying drawings is illustrated counter-bending casing threads syndeton of the present utility model.
Resistant to bending oil casing threaded connection structure of the present utility model, this structure comprises that an end has externally threaded tubing and casing and is screwed with the box cupling that has internal thread, the external screw thread of described sleeve pipe and the internal thread of box cupling are the negative angle taper thread, the internal thread of described box cupling is provided with only torque shoulder, and the diameter of the mesopore of box cupling is greater than the internal diameter of tubing and casing.The median pore diameter of described box cupling is than the big 0.5-1.5mm of box cupling internal diameter.
The tooth form angle of described negative angle taper thread is the 15-28 degree, approaching face is the 20-30 degree, bearing surface is-the 2--5 degree, the pitch of flute profile is per inch three teeth-six teeth, tapering is 1: 16-1: 7, the male thread tooth depth is 2mm-4mm, and the box thread tooth depth is 2mm-4mm, and the endoporus of male thread end, box thread end is concordant.
The only torque shoulder that the internal thread of described box cupling is provided with, only the torque shoulder angle is-the 10--20 degree.The sealing surface of described box cupling is provided with knuckle with ending the torque shoulder place, and the radius of knuckle is at 0.4～0.6mm.
The counter-bending casing threads syndeton of the utility model patent is achieved in that
In screw thread design, adopt the negative angle screw thread to improve tensile property, optimize thread pitch simultaneously, that tries one's best reduces the gap to improve the compression performance of joint, the tooth form angle is the 15-28 degree, approaching face is the 20-30 degree, and bearing surface is-the 2--5 degree that the pitch of flute profile is per inch three teeth-six teeth, tapering is 1: 16-1: 7, the male thread tooth depth is 2mm-4mm, and the box thread tooth depth is 2mm-4mm, and the endoporus of male thread end, box thread end is concordant.The mesopore design of box cupling is different with the special button of VAM and Tener company, and the technology that the utility model does not adopt pipe end to close up, but the design of the mesopore of optimization screw thread design and box cupling are to guarantee the good bending resistance of joint.In the box cupling design, the sealing surface of box cupling is provided with knuckle with ending the torque shoulder place, has adopted less knuckle, and the knuckle radius is about 0.4～0.6mm.
As shown in Figure 1, this counter-bending oil casing threaded connection structure comprises sleeve A and box cupling B two parts composition, and described sleeve A end has external screw thread, and described box cupling B part connects between two sleeve pipes, and the both sides symmetrical configuration comprises internal thread and ends torque shoulder D.Sleeve A and box cupling B endoporus flush, and make oil gas turbulent phenomenon can not take place in transport process, reduce transport resistance.
Described form of thread structure as shown in Figure 2, described externally threaded tooth form angle is 15 degree, wherein bearing surface α 1 be-5 degree, approaching face α 2 20 spends, the male thread tooth depth is 2.16mm, the box thread tooth depth is 2.36mm, can adjust according to the difference of external diameter specification.Pitch is t=5.08mm, thread taper 1: 16.The tooth form angle of described internal thread, approaching face angle, bearing surface angle, pitch, tapering are all consistent with external screw thread.Arrow a represents that sleeve end is the male thread end among Fig. 2, and what b represented is that coupling end is the box thread end.The knuckle radius of box cupling is 0.4mm, and the knuckle radius of sleeve pipe is 0.6mm, shown in the c among Fig. 3.
One side of box cupling was twisted with body earlier and is received the position before sleeve pipe 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.Connect in the button process stubborn, sleeve A and box cupling B are screwed, and external screw thread on the sleeve pipe and the internal thread on the box cupling screw and be combined together until beginning to take place interference, produce certain contact stress.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, press in being subjected to or can be not earlier during external pressure and body leak.Transfer then tubing string proceed next root sleeve pipe on link and connect.
Claims (5)
1. resistant to bending oil casing threaded connection structure, this structure comprises that an end has externally threaded tubing and casing and is screwed with the box cupling that has internal thread, it is characterized in that: the external screw thread of described sleeve pipe and the internal thread of box cupling are the negative angle taper thread, the internal thread of described box cupling is provided with only torque shoulder, and the diameter of the mesopore of box cupling is greater than the internal diameter of tubing and casing.
2. resistant to bending oil casing threaded connection structure according to claim 1, it is characterized in that: the tooth form angle of described negative angle taper thread is the 15-28 degree, approaching face is the 20-30 degree, bearing surface is-2--5 degree, the pitch of flute profile is per inch three teeth-six teeth, and tapering is 1: 16-1: 7, and the male thread tooth depth is 2mm-4mm, the box thread tooth depth is 2mm-4mm, and the endoporus of male thread end, box thread end is concordant.
3. resistant to bending oil casing threaded connection structure according to claim 1 is characterized in that: the median pore diameter of described box cupling is than the big 0.5-1.5mm of box cupling internal diameter.
4. resistant to bending oil casing threaded connection structure according to claim 1 is characterized in that: the only torque shoulder that the internal thread of described box cupling is provided with, ending the torque shoulder angle is-10--20 degree.
5. resistant to bending oil casing threaded connection structure according to claim 1 is characterized in that: the sealing surface of described box cupling is provided with knuckle with ending the torque shoulder place, and the radius of knuckle is at 0.4～0.6mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202510557U CN201763267U (en) | 2010-07-09 | 2010-07-09 | Anti-bending oil sleeve threaded connection structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202510557U CN201763267U (en) | 2010-07-09 | 2010-07-09 | Anti-bending oil sleeve threaded connection structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201763267U true CN201763267U (en) | 2011-03-16 |
Family
ID=43715876
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202510557U Expired - Lifetime CN201763267U (en) | 2010-07-09 | 2010-07-09 | Anti-bending oil sleeve threaded connection structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201763267U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101864906A (en) * | 2010-07-09 | 2010-10-20 | 天津钢管集团股份有限公司 | Bending-resistant oil casing threaded connection structure |
| CN102561956A (en) * | 2012-02-21 | 2012-07-11 | 无锡西姆莱斯石油专用管制造有限公司 | Special round threaded joint of oil casing |
-
2010
- 2010-07-09 CN CN2010202510557U patent/CN201763267U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101864906A (en) * | 2010-07-09 | 2010-10-20 | 天津钢管集团股份有限公司 | Bending-resistant oil casing threaded connection structure |
| CN102561956A (en) * | 2012-02-21 | 2012-07-11 | 无锡西姆莱斯石油专用管制造有限公司 | Special round threaded joint of 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 |
Effective date of registration: 20190708 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. |
|
| TR01 | Transfer of patent right | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110316 |
|
| CX01 | Expiry of patent term |