CN103422819B - A kind of air-tight seal connecting structure for oil well pipe - Google Patents
A kind of air-tight seal connecting structure for oil well pipe Download PDFInfo
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- CN103422819B CN103422819B CN201310391198.6A CN201310391198A CN103422819B CN 103422819 B CN103422819 B CN 103422819B CN 201310391198 A CN201310391198 A CN 201310391198A CN 103422819 B CN103422819 B CN 103422819B
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Abstract
A kind of air-tight seal connecting structure for oil well pipe, including the helicitic texture coordinated between body and box cupling and sealing surface structure；Body screw thread is external screw thread, buttress thread；Box cupling screw thread is female thread, buttress thread；Body sealing surface includes the outer primary sealing area of side, body end, the first outer auxiliary seal face, the second outer auxiliary seal face；Box cupling sealing surface includes the interior primary sealing area of the external primary sealing area of respective tube, the interior auxiliary seal face in corresponding body first outer auxiliary seal face；Body loading end angle 1 °～10 °, 1 ° of 2' of box cupling loading end angle～12 ° of 30'；Body guide surface angle 5 °～15 °, 5 ° of 2' of box cupling guide surface angle～17 ° of 30'；After body and box cupling screw thread twist-on, the screw thread of negative angle loading end, the first outer auxiliary seal face are collectively forming wedge structure with interior primary sealing area.This invention ensures that threaded 100% reaches strong with body etc..
Description
Technical field
The present invention relates to oil well pipe technology, connect knot particularly to a kind of hermetic seal for oil well pipe
Structure.
Background technology
Along with the development of petroleum industry, exploitation difficulty is more and more higher, and API screw thread can not meet oil
Field is to performance requirements such as threaded oil well pipe gas tightness, bonding strength, anti-corrosion capabilities.With regard to tower
In for wood three surpasses gas well, owing to operation oil well pipe bears bigger stretching, compression, intrinsic pressure etc. makees
With, the oil well pipe application risk of general special type of attachment is the biggest.Accordingly, it would be desirable to exploitation adapts
Special thread type of attachment, to adapt to mining requirement.
Existing oil well pipe thread type of attachment, screw thread loading end is based on positive-angle, and male and female head
Loading end angle completely the same.Male and female screw thread does not adapt to the gap of the operating modes such as stretching, compression and sets
Meter.There is no sealing surface, or sealing surface structure is two-part.
Summary of the invention
It is an object of the invention to design a kind of air-tight seal connecting structure for oil well pipe, it is ensured that
Threaded 100% reaches strong with body etc., is included in and bears stretching, compression, intrinsic pressure, external pressure etc.
During various load, under conditions of combined load reaches 100% shaft design intensity, joint
Will not lose efficacy；China is first by the IV of ISO13697 grade of test assessment, and compression efficiency
Reach 100%.
For reaching above-mentioned purpose, the technical scheme is that
A kind of air-tight seal connecting structure for oil well pipe, is characterized in that, including between body and box cupling
The helicitic texture coordinated and sealing surface structure；Described body screw thread is external screw thread, buttress thread；
Described box cupling screw thread is female thread, buttress thread；The sealing surface of described body includes body end
The outer primary sealing area of side, the first outer auxiliary seal of the end face that is connected with outer primary sealing area side, is positioned at
Face, the second outer auxiliary seal face being connected with outer primary sealing area opposite side；The sealing bread of described box cupling
Include the interior primary sealing area of the external primary sealing area of respective tube, corresponding body first outer auxiliary seal face interior auxiliary
Help sealing surface；Described body loading end angle is between-1 °～-10 °, and box cupling loading end angle exists
Between-1 ° 2 '～-12 ° 30 '；Described body guide surface angle is between 5 °～15 °, and box cupling guides
Face angle is between 5 ° 2 '～17 ° 30 '；After body and box cupling screw thread twist-on, the spiral shell of negative angle loading end
Stricture of vagina, the first outer auxiliary seal face are collectively forming wedge structure with interior primary sealing area.
Further, described body, the tooth depth of the screw thread of box cupling are 1～3mm, pitch 3～6mm,
Thread taper 2%～12%.
Described body screw thread and box cupling screw thread have the gap of 0.1～0.5mm in the height direction, at width
Degree has 0.05～0.35mm gap on direction.The tooth depth of the most described body screw thread is less than the tooth of box cupling screw thread
Height, between 0.1～0.5mm.The facewidth of described body screw thread is than box cupling thread width, gap
It is 0.05～0.35mm.
All leave it addition, the circular arc that body screw thread of the present invention contacts with box cupling thread tooth coordinates
Gap, gap length is 0.001～1mm.
The outer primary sealing area of described body and first, second outer auxiliary seal face are the conical surface.
The outer primary sealing area of described body and axis angle are between 20 °-45 °, and the first outer auxiliary is close
Front cover and axis angle are between 50 °-90 °, and the second outer auxiliary seal face exists with the angle of axis
Between 2 °-15 °.
Further, between body first, second outer auxiliary seal face of the present invention and outer primary sealing area
For arc transition, and two arc radius are identical, are 0.2～1.0mm.
The present invention connect by with external screw thread and sealing surface body with female thread and sealing surface
Box cupling forms.Wherein, body screw thread is the most trapezoidal, sealing surface three-stage structure；Box cupling screw thread is partially terraced
Shape screw thread, sealing surface is two-stage structure.After body, box cupling screw thread twist-on, negative angle loading end
Screw thread, the first outer auxiliary seal face, interior primary sealing area be collectively forming highly stable wedge structure,
Firmly primary sealing area effect, increases the reliability sealed.
Body of the present invention, box cupling screw thread be: screw thread tooth depth scope 1-3mm, pitch scope 3～6mm,
Thread taper scope 2%～12%；The tooth depth of body screw thread is less than box cupling tooth depth, leaves 0.1～0.5mm
Radial clearance, in order to store more thread compound, reduce twist-on rear thread fat assemble brought have
Evil stress.
The facewidth of body screw thread is than box cupling thread width, in addition to storing thread compound, it is contemplated that spiral shell
Stricture of vagina needs guide surface faster, more to bear compressive load when bearing compression, alleviate for sealing surface
Impact, axial gap is between 0.05～0.35mm.
The circular arc cooperation of profile of tooth contact all leaves gap, between 0.001～1mm, promotes screw thread in bending
Deng the flexibility under load on.
Loading end angle is between-1 °～-10 °, and box cupling screw thread loading end negative angle is than body spiral shell simultaneously
Stricture of vagina loading end negative angle is smaller, and scope is between-1 ° 2 '～-12 ° 30 ', and this angular deviation can drawn
When stretching, self-assembling formation face and the laminating completely in face, form reliable contacts, it is ensured that hot strength.
Guide surface angle is between 5 °～15 °, and box cupling screw thread guide surface angle is than body screw thread slightly simultaneously
Greatly, scope is between 5 ° 2 '～17 ° 30 ', it is ensured that the self-assembling formation face when compression (when including bending)
Laminating completely with face, it is ensured that contact is reliable.
Three sections of sealing surfaces of body of the present invention are all the conical surfaces, and outer primary sealing area plays main seal effect, the
Auxiliary seal is played in one outer auxiliary seal face, and controls moment of torsion effect；Tie in entirety with negative angle screw thread
Wedge shape Stabilization is played on structure.
First, second outer auxiliary seal face has arc transition, and two circular arcs respectively with outer primary sealing area
Radius is identical so that primary sealing area keeps balance on microcosmic, and stress can be made to be evenly distributed.
And, the second tapered outer auxiliary seal face can promote the sealing of the outer primary sealing area under bending
Effect.
The present invention is compared with the joint disclosed in Chinese patent 200820144761.4 and 02209453.9:
Present configuration loading end is screw thread and auxiliary seal face one combination of negative angle, at integrated connection
On define wedge shape rock-steady structure, have cured the effect of primary sealing area.And above-mentioned two patent loading end
It is positive-angle, it is impossible to form present configuration effect.
The threaded portion of present configuration, in addition to loading end negative angle, for tooth top, flank,
Circular arc etc. has the requirement in gap, and according to the difference of effect, tooth top and the requirement of backlash
Also differ.Different with above-mentioned two patent.
The screw thread of present configuration, the angle for body and box cupling loading end has deviation, for body
Also there is deviation with the angle of box cupling guide surface, formed and preferably connect effect.With above-mentioned two patent not
With.
The body sealing surface of present configuration is syllogic, adds counter-bending effect, and above-mentioned two is special
Profit is two-part, and present configuration is different with above-mentioned two patent.
The primary sealing area of present configuration is consistent with other two sections of auxiliary seal face designed arc-shaped appearances, forms class
It is similar to the balance system of spring, different with above-mentioned two patent.
The present invention is compared with the joint of Chinese patent 201110205192.6: this patent is a kind of screw thread,
Present configuration is a kind of screw thread generally forming wedge shape effect and the type of attachment of sealing surface combination.
The tooth top of the screw thread of present configuration, flank, arc transition all leave gap, and according to work
Difference, the requirement of tooth top and backlash also differs, and improves incompressible, bending resistance further
Bent ability.This patent tooth top leaves radial clearance, and remaining all contacts.
The body screw thread of present configuration and the loading end angle of box cupling screw thread have deviation, are drawing high state
Lower lifting connects effect.Different with this patent.
The body screw thread of present configuration and the guide surface angle of box cupling screw thread have deviation, in compressive state
Lower lifting connects effect.Different with this patent.
The present invention be domestic first by ISO13679 IV grade test in A system and B system test.
It is an advantage of the current invention that:
1. the loading end negative angle differentiation design of body and box cupling screw thread, it is ensured that loading end stress during stretching
Uniformly, screw thread stretch-proof safety coefficient is promoted.
2. the guide surface differential seat angle alienation design of body and box cupling screw thread, it is ensured that screw thread bears compression and (includes
During bending) time guide surface good contact, promote screw thread safety coefficient incompressible, resistant to bending.
3. two auxiliary seal faces of body have arc transition, and two arc radius respectively with primary sealing area
Keeping consistent, identical circular arc makes primary sealing area stress balance on microcosmic, can make stress
It is evenly distributed.
Accompanying drawing explanation
Fig. 1 is the structural representation of the embodiment of the present invention.
Fig. 2 is that embodiment of the present invention middle tube body and box cupling screw thread loading end form wedge structure with sealing surface
Schematic diagram.
Fig. 3 is the structural representation of embodiment of the present invention middle tube body end.
Fig. 4 is embodiment of the present invention middle tube body and the loading end of box cupling screw thread, the structure of guide surface cooperation
Schematic diagram.
Detailed description of the invention
Seeing Fig. 1～Fig. 4, the air-tight seal connecting structure for oil well pipe of the present invention, it includes body
The helicitic texture coordinated between 1 and box cupling 2 and sealing surface structure；Described body 1 screw thread is outer spiral shell
Stricture of vagina, buttress thread；Described box cupling 2 screw thread is female thread, buttress thread；Described body 1
Sealing surface include side, body end outer primary sealing area 11, be connected with outer primary sealing area 11 side,
Be positioned at end face the first outer auxiliary seal face 12, be connected with outer primary sealing area 11 opposite side second outside
Auxiliary seal face 13；The sealing surface of described box cupling 2 includes the interior master of the external primary sealing area of respective tube 11
Sealing surface 21, the interior auxiliary seal face 22 in corresponding body first outer auxiliary seal face 12；Described pipe
Body screw thread 1 loading end 15 angle is between-1 °～-10 °, and box cupling 2 screw thread loading end 23 angle exists
Between-1 ° of 2'～-12 ° of 30'；Described body screw thread 1 guide surface 14 angle between 5 °～15 °,
Box cupling 2 screw thread guide surface 24 angle is between 5 ° of 2'～17 ° of 30'；Body 1 screw thread and box cupling 2 spiral shell
After stricture of vagina twist-on, the screw thread of negative angle loading end 15,23, the first outer auxiliary seal face 12 are with corresponding
Interior auxiliary seal face 22 is collectively forming wedge structure A.
Further, described body 1 screw thread, the tooth depth of box cupling 2 screw thread are 1～3mm, pitch
3～6mm, thread taper 2%～12%；The tooth depth of body screw thread is less than the tooth depth of box cupling screw thread.
Seeing Fig. 4, described body 1 screw thread and box cupling 2 screw thread have 0.1～0.5mm in the height direction
Gap B, width has the clearance C of 0.05～0.35mm.
The circular arc cooperation that body 1 screw thread of the present invention contacts with the profile of tooth of box cupling 2 screw thread all leaves
Clearance D, clearance D size is 0.001～1mm.
The outer primary sealing area 11 of described body 1 and first, second outer auxiliary seal face 12,13 are equal
For the conical surface.
The described outer primary sealing area of body 1 11 and axis angle are between 20 °-45 °, and first is outer auxiliary
Help sealing surface 12 and axis angle between 50 °-90 °, the second outer auxiliary seal face 13 and axis
Angle between 2 °-15 °.
Seeing Fig. 3, the outer auxiliary seal face of body 1 first, second 12,13 of the present invention is with outer
It is arc transition between primary sealing area 11, and two circular arc r1, r2 radiuses are identical.Described circular arc
Radius is 0.2～1.0mm.
The present invention is designed by said structure, it is ensured that threaded 100% reaches strong with body etc.,
Be included in bear stretching, compression, intrinsic pressure, external pressure etc. various load time, reach 100% in combined load
Under conditions of shaft design intensity, joint will not lose efficacy.
Claims (33)
1., for an air-tight seal connecting structure for oil well pipe, it is characterized in that, including between body and box cupling
The helicitic texture coordinated and sealing surface structure；
Described body screw thread is external screw thread, buttress thread；Described box cupling screw thread is interior spiral shell
Stricture of vagina, buttress thread；
The sealing surface of described body includes the outer primary sealing area of side, body end and outer primary seal
Side, face is connected, is positioned at the first outer auxiliary seal face of end face and outer primary sealing area opposite side phase
The second outer auxiliary seal face even；
The sealing surface of described box cupling includes the interior primary sealing area of the external primary sealing area of respective tube, correspondence
The interior auxiliary seal face in body first outer auxiliary seal face；
Described body loading end angle is between-1 °～-10 °, and box cupling loading end angle is-1
° between 2'～-12 ° of 30'；
Described body guide surface angle is between 5 °～15 °, and box cupling guide surface angle is at 5 °
Between 2'～17 ° of 30'；After body and box cupling screw thread twist-on, the screw thread of negative angle loading end, first
Outer auxiliary seal face and interior primary sealing area are collectively forming wedge structure.
2. the air-tight seal connecting structure for oil well pipe as claimed in claim 1, is characterized in that, described
Body, the tooth depth of screw thread of box cupling be 1～3mm, pitch 3～6mm, thread taper 2%～12%；
The tooth depth of body screw thread is less than the tooth depth of box cupling screw thread.
3. the air-tight seal connecting structure for oil well pipe as claimed in claim 1 or 2, is characterized in that,
Described body screw thread and box cupling screw thread have the gap of 0.1～0.5mm in the height direction, at width
Degree has 0.05～0.35mm gap on direction.
4. the air-tight seal connecting structure for oil well pipe as claimed in claim 1 or 2, is characterized in that,
The circular arc cooperation that described body screw thread contacts with the profile of tooth of box cupling screw thread all leaves gap, gap
Size is 0.001～1mm.
5. the air-tight seal connecting structure for oil well pipe as claimed in claim 3, is characterized in that, described
The circular arc that contacts with the profile of tooth of box cupling screw thread of body screw thread coordinate and all leave gap, gap length
It is 0.001～1mm.
6. the air-tight seal connecting structure for oil well pipe as claimed in claim 1 or 2, is characterized in that,
The outer primary sealing area of described body and first, second outer auxiliary seal face are the conical surface.
7. the air-tight seal connecting structure for oil well pipe as claimed in claim 3, is characterized in that, described
The outer primary sealing area of body and first, second outer auxiliary seal face be the conical surface.
8. the air-tight seal connecting structure for oil well pipe as claimed in claim 4, is characterized in that, described
The outer primary sealing area of body and first, second outer auxiliary seal face be the conical surface.
9. the air-tight seal connecting structure for oil well pipe as claimed in claim 5, is characterized in that, described
The outer primary sealing area of body and first, second outer auxiliary seal face be the conical surface.
10. the air-tight seal connecting structure for oil well pipe as claimed in claim 1 or 2, is characterized in that,
Outside described body, primary sealing area and axis angle are between 20 °-45 °, the first outer auxiliary seal
Face and axis angle are between 50 °-90 °, and the second outer auxiliary seal face exists with the angle of axis
Between 2 °-15 °.
11., as claimed in claim 3 for the air-tight seal connecting structure of oil well pipe, is characterized in that, described
The outer primary sealing area of body and axis angle between 20 °-45 °, the first outer auxiliary seal face and
Axis angle is between 50 °-90 °, and the second outer auxiliary seal face exists with the angle of axis
Between 2 °-15 °.
12., as claimed in claim 4 for the air-tight seal connecting structure of oil well pipe, is characterized in that, described
The outer primary sealing area of body and axis angle between 20 °-45 °, the first outer auxiliary seal face and
Axis angle is between 50 °-90 °, and the second outer auxiliary seal face exists with the angle of axis
Between 2 °-15 °.
13., as claimed in claim 5 for the air-tight seal connecting structure of oil well pipe, is characterized in that, described
The outer primary sealing area of body and axis angle between 20 °-45 °, the first outer auxiliary seal face and
Axis angle is between 50 °-90 °, and the second outer auxiliary seal face exists with the angle of axis
Between 2 °-15 °.
14., as claimed in claim 6 for the air-tight seal connecting structure of oil well pipe, is characterized in that, described
The outer primary sealing area of body and axis angle between 20 °-45 °, the first outer auxiliary seal face and
Axis angle is between 50 °-90 °, and the second outer auxiliary seal face exists with the angle of axis
Between 2 °-15 °.
15., as claimed in claim 7 for the air-tight seal connecting structure of oil well pipe, is characterized in that, described
The outer primary sealing area of body and axis angle between 20 °-45 °, the first outer auxiliary seal face and
Axis angle is between 50 °-90 °, and the second outer auxiliary seal face exists with the angle of axis
Between 2 °-15 °.
16., as claimed in claim 8 for the air-tight seal connecting structure of oil well pipe, is characterized in that, described
The outer primary sealing area of body and axis angle between 20 °-45 °, the first outer auxiliary seal face and
Axis angle is between 50 °-90 °, and the second outer auxiliary seal face exists with the angle of axis
Between 2 °-15 °.
17., as claimed in claim 9 for the air-tight seal connecting structure of oil well pipe, is characterized in that, described
The outer primary sealing area of body and axis angle between 20 °-45 °, the first outer auxiliary seal face and
Axis angle is between 50 °-90 °, and the second outer auxiliary seal face exists with the angle of axis
Between 2 °-15 °.
18., as claimed in claim 1 or 2 for the air-tight seal connecting structure of oil well pipe, is characterized in that,
It is arc transition between described body first, second outer auxiliary seal face and outer primary sealing area,
And two arc radius are identical, described arc radius is 0.2～1.0mm.
19., as claimed in claim 3 for the air-tight seal connecting structure of oil well pipe, is characterized in that, described
Body first, second outer auxiliary seal face and outer primary sealing area between be arc transition, and two
Individual arc radius is identical, and described arc radius is 0.2～1.0mm.
20., as claimed in claim 4 for the air-tight seal connecting structure of oil well pipe, is characterized in that, described
Body first, second outer auxiliary seal face and outer primary sealing area between be arc transition, and two
Individual arc radius is identical, and described arc radius is 0.2～1.0mm.
21., as claimed in claim 5 for the air-tight seal connecting structure of oil well pipe, is characterized in that, described
Body first, second outer auxiliary seal face and outer primary sealing area between be arc transition, and two
Individual arc radius is identical, and described arc radius is 0.2～1.0mm.
22., as claimed in claim 6 for the air-tight seal connecting structure of oil well pipe, is characterized in that, described
Body first, second outer auxiliary seal face and outer primary sealing area between be arc transition, and two
Individual arc radius is identical, and described arc radius is 0.2～1.0mm.
23., as claimed in claim 7 for the air-tight seal connecting structure of oil well pipe, is characterized in that, described
Body first, second outer auxiliary seal face and outer primary sealing area between be arc transition, and two
Individual arc radius is identical, and described arc radius is 0.2～1.0mm.
24., as claimed in claim 8 for the air-tight seal connecting structure of oil well pipe, is characterized in that, described
Body first, second outer auxiliary seal face and outer primary sealing area between be arc transition, and two
Individual arc radius is identical, and described arc radius is 0.2～1.0mm.
25., as claimed in claim 9 for the air-tight seal connecting structure of oil well pipe, is characterized in that, described
Body first, second outer auxiliary seal face and outer primary sealing area between be arc transition, and two
Individual arc radius is identical, and described arc radius is 0.2～1.0mm.
26., as claimed in claim 10 for the air-tight seal connecting structure of oil well pipe, is characterized in that, described
Body first, second outer auxiliary seal face and outer primary sealing area between be arc transition, and two
Individual arc radius is identical, and described arc radius is 0.2～1.0mm.
27., as claimed in claim 11 for the air-tight seal connecting structure of oil well pipe, is characterized in that, described
Body first, second outer auxiliary seal face and outer primary sealing area between be arc transition, and two
Individual arc radius is identical, and described arc radius is 0.2～1.0mm.
28., as claimed in claim 12 for the air-tight seal connecting structure of oil well pipe, is characterized in that, described
Body first, second outer auxiliary seal face and outer primary sealing area between be arc transition, and two
Individual arc radius is identical, and described arc radius is 0.2～1.0mm.
29., as claimed in claim 13 for the air-tight seal connecting structure of oil well pipe, is characterized in that, described
Body first, second outer auxiliary seal face and outer primary sealing area between be arc transition, and two
Individual arc radius is identical, and described arc radius is 0.2～1.0mm.
30., as claimed in claim 14 for the air-tight seal connecting structure of oil well pipe, is characterized in that, described
Body first, second outer auxiliary seal face and outer primary sealing area between be arc transition, and two
Individual arc radius is identical, and described arc radius is 0.2～1.0mm.
31., as claimed in claim 15 for the air-tight seal connecting structure of oil well pipe, is characterized in that, described
Body first, second outer auxiliary seal face and outer primary sealing area between be arc transition, and two
Individual arc radius is identical, and described arc radius is 0.2～1.0mm.
32., as claimed in claim 16 for the air-tight seal connecting structure of oil well pipe, is characterized in that, described
Body first, second outer auxiliary seal face and outer primary sealing area between be arc transition, and two
Individual arc radius is identical, and described arc radius is 0.2～1.0mm.
33., as claimed in claim 17 for the air-tight seal connecting structure of oil well pipe, is characterized in that, described
Body first, second outer auxiliary seal face and outer primary sealing area between be arc transition, and two
Individual arc radius is identical, and described arc radius is 0.2～1.0mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310391198.6A CN103422819B (en) | 2013-08-30 | 2013-08-30 | A kind of air-tight seal connecting structure for oil well pipe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310391198.6A CN103422819B (en) | 2013-08-30 | 2013-08-30 | A kind of air-tight seal connecting structure for oil well pipe |
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| Publication Number | Publication Date |
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| CN103422819A CN103422819A (en) | 2013-12-04 |
| CN103422819B true CN103422819B (en) | 2016-12-07 |
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| CN201310391198.6A Active CN103422819B (en) | 2013-08-30 | 2013-08-30 | A kind of air-tight seal connecting structure for oil well pipe |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110318689A (en) * | 2019-08-19 | 2019-10-11 | 中国石油天然气集团有限公司 | A kind of shale gas well high-performance metal self-sealing Special threading connector |
| CN112443279A (en) * | 2019-08-27 | 2021-03-05 | 中国石油化工股份有限公司 | Expansion corrugated pipe joint |
| CN113739674A (en) * | 2020-05-29 | 2021-12-03 | 宝山钢铁股份有限公司 | Inspection gauge for thread tooth width on threaded joint and inspection method thereof |
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| CN203702015U (en) * | 2013-08-30 | 2014-07-09 | 宝山钢铁股份有限公司 | Gas sealconnecting structure for oil well pipe |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6478344B2 (en) * | 2000-09-15 | 2002-11-12 | Abb Vetco Gray Inc. | Threaded connector |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201187260Y (en) * | 2007-12-19 | 2009-01-28 | 宝山钢铁股份有限公司 | Casing tube screwed joint |
| CN101824969A (en) * | 2010-04-09 | 2010-09-08 | 衡阳华菱连轧管有限公司 | Double-shoulder double-sealing face screwed nipple and collar-free oil well pipe using same |
| CN101864908A (en) * | 2010-06-10 | 2010-10-20 | 衡阳鸿菱石油管材有限责任公司 | Threaded connector for pipes |
| CN202039782U (en) * | 2011-04-08 | 2011-11-16 | 无锡西姆莱斯石油专用管制造有限公司 | Anti-bending casing pipe threaded connection structure |
| CN203702015U (en) * | 2013-08-30 | 2014-07-09 | 宝山钢铁股份有限公司 | Gas sealconnecting structure for oil well pipe |
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| Publication number | Publication date |
|---|---|
| CN103422819A (en) | 2013-12-04 |
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