CN102720439B - High sealability BCSG jointing - Google Patents
High sealability BCSG jointing Download PDFInfo
- Publication number
- CN102720439B CN102720439B CN201210199045.7A CN201210199045A CN102720439B CN 102720439 B CN102720439 B CN 102720439B CN 201210199045 A CN201210199045 A CN 201210199045A CN 102720439 B CN102720439 B CN 102720439B
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- Prior art keywords
- conical surface
- thread
- box cupling
- wedge shape
- external screw
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- 238000007598 dipping method Methods 0.000 claims abstract description 4
- 230000007704 transition Effects 0.000 claims description 8
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000007789 sealing Methods 0.000 abstract description 10
- 238000005452 bending Methods 0.000 abstract description 6
- 238000010276 construction Methods 0.000 abstract description 4
- 239000003129 oil well Substances 0.000 description 8
- 210000002445 nipple Anatomy 0.000 description 6
- 239000002184 metal Substances 0.000 description 4
- 239000003208 petroleum Substances 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
Landscapes
- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
Abstract
The present invention relates to a kind of high sealability BCSG jointing, comprise box cupling and body, the middle part of box cupling is provided with interior step cylinder; The two ends of box cupling are processed with the inclined trapezoidal internal thread of standard, and the rear end of inclined trapezoidal internal thread is provided with wedge shape internal thread, and body end is processed with the partially trapezoidal external screw thread of standard, and partially trapezoidal externally threaded front end is provided with wedge shape external screw thread; Be respectively arranged with shape metallic leak-proof structure between the both ends of the surface of interior step cylinder and the end of body, shape metallic leak-proof structure comprises the inner seal structure be arranged on box cupling and the outer seal configuration be arranged on body; Inner seal structure comprises internal conical surface and outward-dipping interior shoulder bevel, and outer seal configuration comprises outer conical surface and intilted outer shoulder bevel.The present invention adds wedge thread and shoulder hermetically-sealed construction in the end of standard buttress thread, adds the bonding strength of joint, sealing performance, bending resistance, incompressible load-carrying ability and torque resistant performance.
Description
Technical field
The present invention relates to the oil well pipe screwed joints being applied to petroleum industry, specifically a kind of high sealability BCSG jointing.
Background technology
Tubing and casing in oil well pipe industry is mainly coupled together by nipple, form oil casing, length reaches thousands of rice, and wherein the quality of the bonding strength of nipple, sealing performance, bending resistance, the performance such as torque resistant performance and tensile load directly affects the quality of connection of oil well pipe.Different geologic structures needs the oil well pipe of the different forms that is threaded, to meet instructions for use.
Along with the development of oilfield exploitation, more and more stricter to the requirement of oil well pipe screwed joints, particularly require more and more higher to the relevant main performance index of oil well pipe.Existing API(American Petroleum Institute (API)) buttress thread joint, the deficiencies such as there is torque resistant performance more weak, bonding strength is low, poor sealing performance, Anti-collapse ability.Each oil well pipe processing enterprise of world new designs of threaded joints is constantly innovated, and has occurred different helicitic texture types of attachment, but still can not meet the instructions for use of oilfield exploitation.
Summary of the invention
The present invention is directed to the problems referred to above, provide a kind of high sealability BCSG jointing, this joint bonding strength is high, good seal performance, and incompressible load can be strong, and torque resistant performance is high simultaneously.
According to technical scheme of the present invention: a kind of high sealability BCSG jointing, comprises the box cupling and body that are threaded connection, the axis middle part of described box cupling inwall is provided with the interior step cylinder of ring-type; It is characterized in that: the two ends of described box cupling are processed with the inclined trapezoidal internal thread of standard, described inclined trapezoidal internal thread is provided with wedge shape internal thread near the rear end of described interior step cylinder, the outer wall of described body end is processed with the partially trapezoidal external screw thread of standard, described partially trapezoidal externally threaded front end is provided with wedge shape external screw thread, and described wedge shape internal thread and the externally threaded tooth side angle of described wedge shape are negative angle; Be respectively arranged with shape metallic leak-proof structure between the both ends of the surface of described interior step cylinder and the end of described body, described shape metallic leak-proof structure comprises the inner seal structure be arranged on described box cupling and the outer seal configuration be arranged on described body; Described inner seal structure comprises the internal conical surface be arranged between described interior step cylinder end face and described coupling inner thread end, shoulder bevel in the outward-dipping formation of end face of described interior step cylinder, is provided with inner vertex circular arc between described interior shoulder bevel and described internal conical surface; Described outer seal configuration comprises the outer conical surface be arranged on the outer wall of described body end, and the end face of described body end slopes inwardly and forms outer shoulder bevel, is provided with outer dead centre circular arc between described outer shoulder bevel and described outer conical surface.
The value of described tooth side angle is 5 ° ~ 15 °.
Described wedge shape internal thread and the externally threaded tooth number of described wedge shape are 1 ~ 5 tooth.
The value of described interior shoulder bevel is 10 ° ~ 40 °, and described outer shoulder bevel is less than the value of described interior shoulder bevel 0 ~ 2 °; The radius of described Inner summit circular arc is 0.30mm ~ 1.50mm, the large 0 ~ 0.5mm of radius of Inner summit circular arc described in the radius ratio of described outer dead centre circular arc.
The length of described internal conical surface is 4 ~ 10mm, the length half pitch longer than the length of described internal conical surface of described outer conical surface.
The interior shoulder thickness of described inner seal structure is 4 ~ 8mm, and the outer shoulder thickness of described outer seal configuration is equal with described interior shoulder thickness.
The inwall of described body end is provided with inner cylinder face, and described inner cylinder face is connected by the endoporus of the transition conical surface with described body, and the length of described inner cylinder face is 5 ~ 20mm.
Technique effect of the present invention is: the present invention adds the shoulder hermetically-sealed construction of wedge thread and metal and metal in the end of standard buttress thread, add the bonding strength of joint, sealing performance, bending resistance, incompressible load-carrying ability and torque resistant performance.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is the structural representation after the present invention decomposes.
Fig. 3 is the tooth form figure of the wedge shape in the present invention.
Fig. 4 is the enlarged drawing of the inner seal structure in the present invention.
Fig. 5 is the enlarged drawing of the outer seal configuration in the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is further described.
In Fig. 1 ~ Fig. 5, comprise that box cupling 1, body 2, partially trapezoidal internal thread 3, partially trapezoidal external screw thread 4, wedge shape internal thread 5, wedge shape external screw thread 6, inner seal structure 7, outer seal configuration 8, middle line 9, interior shoulder cylinder 10, tapering 11, pitch 12, tooth depth 13, flute profile tooth are wide by 14, flute profile groove width 15, tooth side angle 16, flute profile circular arc 17, internal conical surface 18, outer conical surface 19, interior shoulder thickness 20, outer shoulder thickness 21, interior shoulder bevel 22, outer shoulder bevel 23, inner vertex circular arc 24, outer dead centre circular arc 25, inner cylinder face 26, the transition conical surface 27, body 28 etc.
As shown in Figure 1 and Figure 2, the present invention is a kind of high sealability BCSG jointing, comprise the box cupling 1 and body 2,28 that are threaded connection, box cupling 1 and body 2,28 are for benchmark with virtual middle line 9, screw with internal and external threads, undertaken somely being connected to form oil, casing string by box cupling 1 with body 2 and body 28, meet the requirement of oil gas field production and application.
The axis middle part of box cupling 1 inwall is provided with the interior step cylinder 10 of ring-type.The length range of interior step cylinder 10 is 50 ~ 200mm, can increase bonding strength and the bending resistance of joint.
The two ends of box cupling 1 are processed with the inclined trapezoidal internal thread 3 of standard, and inclined trapezoidal internal thread 3 is provided with wedge shape internal thread 5 near the rear end of interior step cylinder 10.The outer wall of body 2,28 end is processed with the partially trapezoidal external screw thread 4 of standard, the front end of partially trapezoidal external screw thread 4 is provided with wedge shape external screw thread 6.Inclined trapezoidal internal thread 3 adopts API standard with partially trapezoidal external screw thread 4.
As shown in Figure 3, wedge shape internal thread 5 is different from from the measure-alike tolerance of wedge shape external screw thread 6 seal request reached during interference fits.Wedge shape internal thread 5 is negative angle with the tooth side angle 16 of wedge shape external screw thread 6, and the value of tooth side angle 16 is 5 ° ~ 15 °.Wedge shape internal thread 5 and the tapering 11 of wedge shape external screw thread 6 are 1:16, pitch 12 is 5.08mm, and its tapering, pitch are identical with API standard, when wedge thread screws, screw freely under the guiding of buttress thread, and any interference can not occur.Wedge shape internal thread 5 and the tooth depth 13 of wedge shape external screw thread 6 are 1.00mm ~ 1.43mm, flute profile tooth wide 14 is 1.50mm ~ 2.07mm, flute profile groove width 15 is 2.55mm ~ 3.03mm, flute profile circular arc 17 radius is 0.10mm ~ 0.50mm.Wedge shape internal thread 5 is 1 ~ 5 tooth with the tooth number of wedge shape external screw thread 6.
Adding man-hour, buttress thread should seamlessly transit to during wedge thread transition deformation, and transition face length can not more than the length of 1 pitch.The total length of buttress thread and wedge thread can by reducing or increase buttress thread tooth number, also the total length requirement of body 2,28 end processing is met by reducing or increase wedge thread tooth number, but its tooth number increasing or reduce can not more than 4 teeth, and the processing of its box cupling 1 screw thread is identical.
Again see Fig. 1 and Fig. 2, in box cupling 1, be respectively arranged with shape metallic leak-proof structure between the both ends of the surface of step cylinder 10 and the end of body 2,28.Shape metallic leak-proof structure comprises the inner seal structure 7 be arranged on box cupling 1 and the outer seal configuration 8 be arranged on body 2,28.
As shown in Figure 4, inner seal structure 7 comprises the internal conical surface 18 be arranged between interior step cylinder 10 end face and box cupling 1 internal threaded end, and the length of internal conical surface 18 is 4 ~ 10mm, and interior shoulder thickness 20 is 4 ~ 8mm; Shoulder bevel 22 in the outward-dipping formation of end face of interior step cylinder 10, the value of interior shoulder bevel 22 is 10 ° ~ 40 °; The radius being provided with inner vertex circular arc 24, Inner summit circular arc 24 between interior shoulder bevel 22 and internal conical surface 18 is 0.30mm ~ 1.50mm.
As shown in Figure 5, outer seal configuration 8 comprises the outer conical surface 19 be arranged on body 2,28 end outer wall, the length half pitch longer than the length of internal conical surface 18 of outer conical surface 19, does not interfere with wedge shape external screw thread 6 closely cooperating under high pulling torque to meet wedge shape internal thread 5.The outer shoulder thickness 21 of outer seal configuration 8 is equal with interior shoulder thickness 20, with meet its closely cooperate after in same plane, oil gas turbulent phenomenon in body can not be caused, reach and smoothly pass through smoothly.The end face of body 2,28 end slopes inwardly and forms outer shoulder bevel 23, outer shoulder bevel 23 is less than the value of interior shoulder bevel 22 0 ~ 2 °, with 0.5 ° ~ 1 ° the best, meet the state of plastic deformation that inside and outside shoulder causes in the tight situation of machine and be issued to interference fits or interference fit state.Outer dead centre circular arc 25 is provided with between outer shoulder bevel 23 and outer conical surface 19, large 0 ~ the 0.5mm of radius of the radius ratio Inner summit circular arc 24 of outer dead centre circular arc 25, to meet inside and outside shoulder in the tight situation of machine, the state of plastic deformation caused when inside and outside circular arc coordinates is issued to interference fits or interference fit state.
The inwall of body 2,28 end is provided with inner cylinder face 26, inner cylinder face 26 is connected with the endoporus of body 2,28 by the transition conical surface 27, the length of inner cylinder face 26 is 5 ~ 20mm, the transition conical surface 27 length does not do requirement, the length of its inner cylinder face 26 and the transition conical surface 27 can specify according to body 2,28 wall thickness, can keep same plane with interior step cylinder 10 and seamlessly transit after closely cooperate.
When the present invention operates, any one end of box cupling 1 is first inserted on body 2, the external screw thread of the internal thread of box cupling 1 and body 2 first should be inserted in 3 ~ 7 when being inserted in detain, should be light and slow by outer external screw thread make-up then manpower screw-in during hitch, with manpower screw motionless be till, the hand-tight box cupling 1 that spins together and body 2 petroleum pipeline screw-on machine device are carried out further machine and twist and access machine and twist interference fit state when connecing.
When box cupling 1 and body 2 are after machine is twisted and taken over and be full of and screw and coordinate, its wedge shape internal thread 5, wedge shape external screw thread 6 buttress thread screw guiding under, smoothly can screw in pairing and reach the sealing that interference fits state type becomes certain, wedge thread can significantly increase its bonding strength and bending resistance, its wedge thread flute profile has high sealing performance, the high composite bearing ability of effective raising nipple, can provide suitable with body in press drag; Simultaneously, shoulder thickness 20 and outer shoulder thickness 21 reach interference fit, considerably increase the ability of its high resistance torsional performance and compressive load ability and tensile load.Internal conical surface 18 forms radial interference fit with the external diameter of both outer conical surface 19, greatly increases the sealing performance that it coordinates.The position that machine is tight and torque can be made separate stipulations according to API standard operation or technical papers, but must must not have any gap with outer shoulder thickness 21 to meet interior shoulder thickness 20 after machine tightly screws.Its box cupling 1 and body 28 are closely cooperate for benchmark with virtual middle line 9 by same fastening method, reach body 28 and body 2 and are undertaken by box cupling 1 that some connecting-types become oil, casing string meets the requirement of oil gas field production and application.When going into the well in oil field, its connector machine is one by one close to the oil casing that direct type becomes thousands of meters.
The present invention adds wedge thread hermetically-sealed construction in the end of standard buttress thread, wedge thread significantly can increase bonding strength and the bending resistance of joint, its wedge type thread tooth type has high sealing performance, the high composite bearing ability of effective raising nipple, can provide suitable with body in press drag, wedge type screw thread effectively improves anti-tripping performance and the tensile load performance of nipple; The present invention have employed the shoulder hermetically-sealed construction of metal and metal simultaneously, reaches the double sealing structure of nipple, considerably increases incompressible load-carrying ability and torque resistant performance and high sealing performance.The present invention is applicable to deep-well, ultradeep well, high pressure oil wells and high-pressure gas well and uses very much.
Claims (1)
1. a high sealability BCSG jointing, comprises the box cupling (1) and body (2,28) that are threaded connection, and the axis middle part of described box cupling (1) inwall is provided with the interior step cylinder (10) of ring-type; It is characterized in that: the two ends of described box cupling (1) are processed with the inclined trapezoidal internal thread of standard (3), the inclined trapezoidal internal thread of described standard (3) is provided with wedge shape internal thread (5) near the rear end of described interior step cylinder (10), the outer wall of described body (2,28) end is processed with the partially trapezoidal external screw thread (4) of standard, the front end of the partially trapezoidal external screw thread (4) of described standard is provided with wedge shape external screw thread (6), and described wedge shape internal thread (5) is negative angle with the tooth side angle (16) of described wedge shape external screw thread (6); Be respectively arranged with shape metallic leak-proof structure between the both ends of the surface of described interior step cylinder (10) and the end of described body (2,28), described shape metallic leak-proof structure comprises the inner seal structure (7) be arranged on described box cupling (1) and the outer seal configuration (8) be arranged on described body (2,28); Described inner seal structure (7) comprises the internal conical surface (18) be arranged between described interior step cylinder (10) end face and described box cupling (1) internal threaded end, shoulder bevel (22) in the outward-dipping formation of end face of described interior step cylinder (10), is provided with inner vertex circular arc (24) between described interior shoulder bevel (22) and described internal conical surface (18); Described outer seal configuration (8) comprises the outer conical surface (19) be arranged on described body (2,28) end outer wall, the end face of described body (2,28) end slopes inwardly and forms outer shoulder bevel (23), is provided with outer dead centre circular arc (25) between described outer shoulder bevel (23) and described outer conical surface (19);
The value of described tooth side angle (16) is 5 ° ~ 15 °;
Described wedge shape internal thread (5) is 1 ~ 5 tooth with the tooth number of described wedge shape external screw thread (6);
The value of described interior shoulder bevel (22) is 10 ° ~ 40 °, and described outer shoulder bevel (23) is less 0 ~ 2 ° than the value of described interior shoulder bevel (22); The radius of described inner vertex circular arc (24) is 0.30mm ~ 1.50mm, the large 0 ~ 0.5mm of radius of inner vertex circular arc (24) described in the radius ratio of described outer dead centre circular arc (25);
The length of described internal conical surface (18) is 4 ~ 10mm, the length half pitch longer than the length of described internal conical surface (18) of described outer conical surface (19);
The interior shoulder thickness (20) of described inner seal structure (7) is 4 ~ 8mm, and the outer shoulder thickness (21) of described outer seal configuration (8) is equal with described interior shoulder thickness (20);
The inwall of described body (2,28) end is provided with inner cylinder face (26), and described inner cylinder face (26) is connected by the endoporus of the transition conical surface (27) with described body (2,28), and the length of described inner cylinder face (26) is 5 ~ 20mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210199045.7A CN102720439B (en) | 2012-06-16 | 2012-06-16 | High sealability BCSG jointing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210199045.7A CN102720439B (en) | 2012-06-16 | 2012-06-16 | High sealability BCSG jointing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102720439A CN102720439A (en) | 2012-10-10 |
| CN102720439B true CN102720439B (en) | 2015-09-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210199045.7A Expired - Fee Related CN102720439B (en) | 2012-06-16 | 2012-06-16 | High sealability BCSG jointing |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102678065A (en) * | 2012-06-06 | 2012-09-19 | 无锡西姆莱斯石油专用管制造有限公司 | High-airtightness special buttress thread pipe joint |
| CN102678071A (en) * | 2012-06-06 | 2012-09-19 | 无锡西姆莱斯石油专用管制造有限公司 | High-airtightness special buttress thread sleeve connection joint |
| CN202578555U (en) * | 2012-04-25 | 2012-12-05 | 无锡西姆莱斯石油专用管制造有限公司 | Special buttress thread oil casing joint |
| CN202578554U (en) * | 2012-04-25 | 2012-12-05 | 无锡西姆莱斯石油专用管制造有限公司 | Special buttress thread oil sleeve connection joint |
| CN102852466A (en) * | 2012-04-25 | 2013-01-02 | 无锡西姆莱斯石油专用管制造有限公司 | Special buttress thread oil sleeve connecting joint |
| CN202673174U (en) * | 2012-06-06 | 2013-01-16 | 无锡西姆莱斯石油专用管制造有限公司 | High seal special buttress thread pipe connector |
| CN202673175U (en) * | 2012-06-06 | 2013-01-16 | 无锡西姆莱斯石油专用管制造有限公司 | High seal special buttress thread sleeve pipe connector |
| CN202673178U (en) * | 2012-06-16 | 2013-01-16 | 无锡西姆莱斯石油专用管制造有限公司 | High-sealing buttress threaded conduit connecting joint |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060071473A1 (en) * | 2004-10-05 | 2006-04-06 | Sivley Robert S Iv | Helical groove for a tubular connection |
| CN200946463Y (en) * | 2006-06-08 | 2007-09-12 | 天津钢管集团有限公司 | Spiral seal type sleeve connection structure |
| CN201705230U (en) * | 2010-02-26 | 2011-01-12 | 中国石油天然气集团公司 | Special threading connector for sleeve with small external diameter |
| 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 |
-
2012
- 2012-06-16 CN CN201210199045.7A patent/CN102720439B/en not_active Expired - Fee Related
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202578555U (en) * | 2012-04-25 | 2012-12-05 | 无锡西姆莱斯石油专用管制造有限公司 | Special buttress thread oil casing joint |
| CN202578554U (en) * | 2012-04-25 | 2012-12-05 | 无锡西姆莱斯石油专用管制造有限公司 | Special buttress thread oil sleeve connection joint |
| CN102852466A (en) * | 2012-04-25 | 2013-01-02 | 无锡西姆莱斯石油专用管制造有限公司 | Special buttress thread oil sleeve connecting joint |
| CN102678065A (en) * | 2012-06-06 | 2012-09-19 | 无锡西姆莱斯石油专用管制造有限公司 | High-airtightness special buttress thread pipe joint |
| CN102678071A (en) * | 2012-06-06 | 2012-09-19 | 无锡西姆莱斯石油专用管制造有限公司 | High-airtightness special buttress thread sleeve connection joint |
| CN202673174U (en) * | 2012-06-06 | 2013-01-16 | 无锡西姆莱斯石油专用管制造有限公司 | High seal special buttress thread pipe connector |
| CN202673175U (en) * | 2012-06-06 | 2013-01-16 | 无锡西姆莱斯石油专用管制造有限公司 | High seal special buttress thread sleeve pipe connector |
| CN202673178U (en) * | 2012-06-16 | 2013-01-16 | 无锡西姆莱斯石油专用管制造有限公司 | High-sealing buttress threaded conduit connecting joint |
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| CN102720439A (en) | 2012-10-10 |
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