CN103422819A - Airtight connection structure for oil well pipe - Google Patents
Airtight connection structure for oil well pipe Download PDFInfo
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- CN103422819A CN103422819A CN2013103911986A CN201310391198A CN103422819A CN 103422819 A CN103422819 A CN 103422819A CN 2013103911986 A CN2013103911986 A CN 2013103911986A CN 201310391198 A CN201310391198 A CN 201310391198A CN 103422819 A CN103422819 A CN 103422819A
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- screw thread
- box cupling
- angle
- oil well
- sealing area
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- 239000003129 oil well Substances 0.000 title claims abstract description 20
- 238000007789 sealing Methods 0.000 claims abstract description 71
- 230000007704 transition Effects 0.000 claims description 6
- 230000006835 compression Effects 0.000 abstract description 9
- 238000007906 compression Methods 0.000 abstract description 9
- 238000011156 evaluation Methods 0.000 abstract 1
- 230000008520 organization Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 10
- 238000005452 bending Methods 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
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Abstract
An airtight connection structure for an oil well pipe comprises a thread structure and a sealing face structure, which are matched between a pipe body and a hoop; the pipe body threads are external and buttress threads; the hoop threads are internal and buttress threads; the pipe body sealing face comprises an outer main sealing face, a first outer assisting sealing face and a second outer assisting sealing face, which are at the end side of the end part of the pipe body; the hoop sealing face comprises an inner main sealing face corresponding to the outer main sealing face of the pipe body and an inner assisting sealing face corresponding to the first outer assisting sealing face of the pipe body; a bearing face angle of the pipe body is -1 degrees- -10 degrees, the hoop carrying face angle is -1 degrees 2 minutes- -12 degrees 30 minutes, the pipe body guiding face angle is 5 degrees - 15 degrees, and the hoop guiding face angle is 5 degrees 2 minutes to 17 degrees 30 minutes; and after the threads of the pipe body and the hoop are screwed, the threads of the negative angle carrying faces, the first outer assisting sealing face and the inner assisting sealing face jointly form a wedge structure. The airtight connection structure for the oil well pipe achieves the 100% strength as the pipe body by thread connection, and the compression efficiency achieves 100% by the IV level test evaluation of ISO (international standard organization) 13697.
Description
Technical field
The present invention relates to the oil well pipe technology, particularly a kind of air-tight seal connecting structure for oil well pipe.
Background technology
Along with the development of petroleum industry, the exploitation difficulty is more and more higher, and the API screw thread can not meet the performance requirements such as oil well pipe gas tightness that the oil field double thread connects, bonding strength, anti-corrosion capability.With regard to Tarim Basin three surpasses gas well, bear the effects such as larger stretching, compression, interior pressure with oil well pipe due to operation, the oil well pipe application risk of general special type of attachment is also very large.Therefore, the special thread type of attachment that needs exploitation to adapt, to adapt to mining requirement.
Existing oil well pipe thread type of attachment, the screw thread bearing surface be take positive-angle as main, and the bearing surface angle of male and female head is in full accord.The male and female screw thread does not adapt to the gap design of the operating modes such as stretching, compression.There is no sealing surface, or sealing surface structure is two-part.
Summary of the invention
The object of the invention is to design a kind of air-tight seal connecting structure for oil well pipe, can guarantee to be threaded and 100% reach strong with body etc., while being included in various loads such as bearing stretching, compression, interior pressure, external pressure, in combined load, reaching under the condition of 100% body design strength, can not lose efficacy in the joint junction; China is first by the IV level test assessment of ISO13697, and compression efficiency reaches 100%.
For achieving the above object, technical scheme of the present invention is:
A kind of air-tight seal connecting structure for oil well pipe, is characterized in that, comprises the helicitic texture and the sealing surface structure that coordinate between body and box cupling; Described body screw thread is external screw thread, buttress thread; Described box cupling screw thread is internal thread, buttress thread; The sealing surface of described body comprises the distolateral outer primary sealing area in body end, with outer primary sealing area one side, is connected, is positioned at the first outer auxiliary seal face of end face, the second outer auxiliary seal face be connected with outer primary sealing area opposite side; The sealing surface of described box cupling comprises the interior primary sealing area of the external primary sealing area of respective tube, the interior auxiliary seal face of the outer auxiliary seal face of corresponding body first; Described body bearing surface angle between-1 °～-10 °, box cupling bearing surface angle-1 ° 2 '～-12 ° 30 ' between; Described body guide surface angle between 5 °～15 °, box cupling guide surface angle 5 ° 2 '～17 ° 30 ' between; After body and box cupling screw thread are twisted and connect, the screw thread of negative angle bearing surface, the first outer auxiliary seal face and interior primary sealing area form wedge structure jointly.
Further, the tooth depth of the screw thread of described body, box cupling is 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 on short transverse, and 0.05～0.35mm gap is arranged on width.Be the tooth depth that the tooth depth of described body screw thread is less than the box cupling screw thread, between 0.1～0.5mm.The facewidth of described body screw thread is than box cupling thread width, and gap is 0.05～0.35mm.
In addition, the circular arc cooperation that body screw thread of the present invention contacts with the box cupling thread tooth all leaves gap, and 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 seal face and axis angle are between 50 °-90 °, and the angle of the second outer auxiliary seal face and axis is between 2 °-15 °.
Having, between first, second outer auxiliary seal face of body of the present invention and outer primary sealing area, be arc transition, and two arc radius is identical, are 0.2～1.0mm again.
The present invention connects by the body with external screw thread and sealing surface and the box cupling with internal thread and sealing surface and forms.Wherein, the body screw thread is partially trapezoidal, the sealing surface three-stage structure; The box cupling screw thread is buttress thread, and sealing surface is two-stage structure.After body, box cupling screw thread are twisted and connect, the screw thread of negative angle bearing surface, the first outer auxiliary seal face, interior primary sealing area be common forms highly stable wedge structure, and firm primary sealing area effect increases the reliability of sealing.
Body of the present invention, box cupling screw thread are: 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 the box cupling tooth depth, leaves the radial clearance of 0.1～0.5mm, in order to store more thread compound, reduces to twist connecing harmful stress that the gathering of rear thread fat brings.
The facewidth of body screw thread, than box cupling thread width, except storing thread compound, considers that screw thread needs guide surface sooner, more to bear compressive load while bearing compression, alleviates the impact for sealing surface, and end play is between 0.05～0.35mm.
The circular arc cooperation of profile of tooth contact all leaves gap, between 0.001～1mm, promotes the flexibility of screw thread under the load ons such as bending.
The bearing surface angle is between-1 °～-10 °, box cupling screw thread bearing surface negative angle is more smaller than body screw thread bearing surface negative angle simultaneously, scope-1 ° 2 '～-12 ° 30 ' between, this angular deviation can be when stretching the laminating fully of self-assembling formation face and face, form reliable contact, guarantee hot strength.
The guide surface angle is between 5 °～15 °, and simultaneously box cupling screw thread guide surface angle is more bigger than body screw thread, scope 5 ° 2 '～17 ° 30 ' between, guarantee the laminating fully of self-assembling formation face and face when compression (while comprising bending), guarantee that contact reliably.
Three sections sealing surfaces of body of the present invention are all the conical surfaces, and outer primary sealing area plays main sealing function, and the first outer auxiliary seal face plays auxiliary seal, and the control torque effect; Play the wedge shape stabilization with the negative angle screw thread on overall structure.
First, second outer auxiliary seal face has arc transition with outer primary sealing area respectively, and two arc radius are identical, makes primary sealing area keep balance on microcosmic, can make stress be evenly distributed.
And the second outer auxiliary seal face that is tapering can promote the sealing effectiveness of the outer primary sealing area under bending.
The present invention compares with 02209453.9 disclosed joint with Chinese patent 200820144761.4:
The screw thread that structural bearing face of the present invention is negative angle and one combination of auxiliary seal face have formed the wedge shape rock-steady structure on integrated connection, have solidified the effect of primary sealing area.And above-mentioned two patent bearing surfaces are positive-angle, can't form effect structure of the present invention.
The threaded portion of structure of the present invention, except the bearing surface negative angle, locate all gapped requirements for tooth top, flank, circular arc etc., and, according to the difference acted on, the requirement of tooth top and backlash is not identical yet.Different with above-mentioned two patents.
The screw thread of structure of the present invention, have deviation for the angle of body and box cupling bearing surface, for the angle of body and box cupling guide surface, deviation also arranged, and forms and connect preferably effect.Different with above-mentioned two patents.
The body sealing surface of structure of the present invention is syllogic, has increased counter-bending effect, and above-mentioned two patents are two-parts, and structure of the present invention is different with above-mentioned two patents.
The primary sealing area of structure of the present invention is consistent with other two sections auxiliary seal face designed arc-shaped appearances, forms the balance sysmte that is similar to spring, different with above-mentioned two patents.
The present invention compares with the joint of Chinese patent 201110205192.6: this patent is a kind of screw thread, and structure of the present invention is a kind of screw thread of wedge shape effect and type of attachment of sealing surface combination of forming on the whole.
The tooth top of the screw thread of structure of the present invention, flank, arc transition all leave gap, and, according to the difference acted on, the requirement of tooth top and backlash is not identical yet, has further promoted incompressible, resistant to bending ability.This patent tooth top leaves radial clearance, and all the other all contact.
The body screw thread of structure of the present invention and the bearing surface angle of box cupling screw thread have deviation, are drawing high lifting connection effect under state.Different with this patent.
The body screw thread of structure of the present invention and the guide surface angle of box cupling screw thread have deviation, promote under compressive state and connect effect.Different with this patent.
The present invention is domestic first by the A system in the test of ISO13679 IV level and the test of B system.
The invention has the advantages that:
1. the bearing surface negative angle differentiation of body and box cupling screw thread design, while guaranteeing to stretch, bearing surface is stressed evenly, promotes screw thread stretch-proof safety factor.
2. the guide surface differential seat angle alienation of body and box cupling screw thread design, guarantee that screw thread bears the good contact of compression guide surface when (while comprising bending), promotes incompressible, the resistant to bending safety factor of screw thread.
3. two of body auxiliary seal faces have arc transition with primary sealing area respectively, and two arc radius are consistent, and identical circular arc makes primary sealing area stress balance on microcosmic, can make stress be evenly distributed.
The accompanying drawing explanation
The structural representation that Fig. 1 is the embodiment of the present invention.
The schematic diagram that Fig. 2 is embodiment of the present invention middle tube body and box cupling screw thread bearing surface and sealing surface formation wedge structure.
The structural representation that Fig. 3 is embodiment of the present invention middle tube body end.
The structural representation that the bearing surface that Fig. 4 is embodiment of the present invention middle tube body and box cupling screw thread, guide surface coordinate.
The specific embodiment
Referring to Fig. 1～Fig. 4, the air-tight seal connecting structure for oil well pipe of the present invention, it comprises helicitic texture and the sealing surface structure coordinated between body 1 and box cupling 2; Described body 1 screw thread is external screw thread, buttress thread; Described box cupling 2 screw threads are internal thread, buttress thread; The sealing surface of described body 1 comprises the distolateral outer primary sealing area 11 in body end, with outer primary sealing area 11 1 sides, is connected, is positioned at the first outer auxiliary seal face 12 of end face, the second outer auxiliary seal face 13 be connected with outer primary sealing area 11 opposite sides; The sealing surface of described box cupling 2 comprises the interior primary sealing area 21 of the external primary sealing area 11 of respective tube, the interior auxiliary seal face 22 of the outer auxiliary seal face 12 of corresponding body first; Described body screw thread 1 bearing surface 15 angles are between-1 °～-10 °, and box cupling 2 screw thread bearing surface 23 angles are between-1 ° of 2'～-12 ° 30'; Described body screw thread 1 guide surface 14 angles are between 5 °～15 °, and box cupling 2 screw thread guide surface 24 angles are between 5 ° of 2'～17 ° 30'; After body 1 screw thread and box cupling 2 screw threads are twisted and are connect, the screw thread of negative angle bearing surface 15,23, the first outer auxiliary seal face 12 and the common wedge structure A that forms of corresponding interior auxiliary seal face 22.
Further, the tooth depth of described body 1 screw thread, box cupling 2 screw threads is 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.
Referring to Fig. 4, described body 1 screw thread and box cupling 2 screw threads have the gap B of 0.1～0.5mm on short transverse, and the clearance C of 0.05～0.35mm is arranged on width.
The circular arc cooperation that body 1 screw thread of the present invention contacts with the profile of tooth of box cupling 2 screw threads all leaves clearance D, and the 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 the conical surface.
The outer primary sealing area 11 of described body 1 and axis angle are between 20 °-45 °, and the first outer auxiliary seal face 12 and axis angle are between 50 °-90 °, and the angle of the second outer auxiliary seal face 13 and axis is between 2 °-15 °.
Referring to Fig. 3, between body 1 first, second outer auxiliary seal face 12,13 of the present invention and outer primary sealing area 11, be arc transition, and two circular arc r1, r2 radius are identical.Described arc radius is 0.2～1.0mm.
The present invention designs by said structure, guaranteed to be threaded and 100% reached strong with body etc., while being included in various loads such as bearing stretching, compression, interior pressure, external pressure, in combined load, reaching under the condition of 100% body design strength, can not lose efficacy in the joint junction.
Claims (7)
1. the air-tight seal connecting structure for oil well pipe, is characterized in that, comprises the helicitic texture and the sealing surface structure that coordinate between body and box cupling;
Described body screw thread is external screw thread, buttress thread; Described box cupling screw thread is internal thread, buttress thread;
The sealing surface of described body comprises the distolateral outer primary sealing area in body end, with outer primary sealing area one side, is connected, is positioned at the first outer auxiliary seal face of end face, the second outer auxiliary seal face be connected with outer primary sealing area opposite side;
The sealing surface of described box cupling comprises the interior primary sealing area of the external primary sealing area of respective tube, the interior auxiliary seal face of the outer auxiliary seal face of corresponding body first;
Described body bearing surface angle is between-1 °～-10 °, and box cupling bearing surface angle is between-1 ° of 2'～-12 ° 30';
Described body guide surface angle is between 5 °～15 °, and box cupling guide surface angle is between 5 ° of 2'～17 ° 30'; After body and box cupling screw thread are twisted and connect, the screw thread of negative angle bearing surface, the first outer auxiliary seal face and interior primary sealing area form wedge structure jointly.
2. the air-tight seal connecting structure for oil well pipe as claimed in claim 1, is characterized in that, the tooth depth of the screw thread of described body, box cupling is 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 on short transverse, and 0.05～0.35mm gap is arranged on width.
4. as claim 1 or the 2 or 3 described air-tight seal connecting structures for oil well pipe, it 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, and gap length is 0.001～1mm.
5. the air-tight seal connecting structure for oil well pipe as claimed in claim 1 or 2 or 3 or 4, is characterized in that, the outer primary sealing area of described body and first, second outer auxiliary seal face are the conical surface.
6. as claim 1 or 2 or 3 or the 4 or 5 described air-tight seal connecting structures for oil well pipe, it is characterized in that, the outer primary sealing area of described body and axis angle are between 20 °-45 °, the first outer auxiliary seal face and axis angle are between 50 °-90 °, and the angle of the second outer auxiliary seal face and axis is between 2 °-15 °.
7. as claim 1 or 2 or 3 or the 4 or 6 described air-tight seal connecting structures for oil well pipe, it is characterized in that, between first, second outer auxiliary seal face of described body and outer primary sealing area, be arc transition, and two arc radius are identical, described arc radius is 0.2～1.0mm.
Priority Applications (1)
| 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 |
Applications Claiming Priority (1)
| 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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103422819A true CN103422819A (en) | 2013-12-04 |
| CN103422819B CN103422819B (en) | 2016-12-07 |
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| Application Number | Title | Priority Date | Filing Date |
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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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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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| US20020033603A1 (en) * | 2000-09-15 | 2002-03-21 | Pallini Joseph W. | Threaded connector |
| 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 |
-
2013
- 2013-08-30 CN CN201310391198.6A patent/CN103422819B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020033603A1 (en) * | 2000-09-15 | 2002-03-21 | Pallini Joseph W. | Threaded connector |
| 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 |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103422819B (en) | 2016-12-07 |
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