CN202039782U - Anti-bending casing pipe threaded connection structure - Google Patents
Anti-bending casing pipe threaded connection structure Download PDFInfo
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- CN202039782U CN202039782U CN2011201010642U CN201120101064U CN202039782U CN 202039782 U CN202039782 U CN 202039782U CN 2011201010642 U CN2011201010642 U CN 2011201010642U CN 201120101064 U CN201120101064 U CN 201120101064U CN 202039782 U CN202039782 U CN 202039782U
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- screw thread
- external screw
- thread
- sleeve pipe
- internal thread
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Abstract
The utility model relates to an anti-bending casing pipe threaded connection structure, which comprises a casing pipe and a collar, wherein the collar is fastened and connected with the casing pipe by a thread; an outer thread, an outer sealing cone surface and a sealing end surface are sequentially arranged on the outer surface at one end of the casing pipe, the sealing end surface is arranged at one end part of the casing pipe correspondingly provided with the outer thread, and the sealing end surface is connected with the end part of the outer thread by the outer sealing cone surface; an inner thread, an inner sealing cone surface and a torsional table shoulder are sequentially arranged on the inner surface of the collar; the inner thread is matched with the outer thread, and the outer thread and the inner thread adopt inverted hook structures; one end of the casing pipe correspondingly provided with the outer thread stretches into the collar, and the casing pipe is fastened and connected with the inner thread of the collar by the outer thread; and the inner sealing cone surface and the outer sealing cone surface are in interference match, and the torsional table shoulder and the sealing end surface are in interference match. The anti-bending casing pipe threaded connection structure is simple and compact in structure, convenient in installation and use, high in connecting strength, good in sealing performance and anti-bending performance and wide in application scope and is safe and reliable.
Description
Technical field
The utility model relates to a kind of screw connection structure, and especially a kind of resistant to bending casing threads syndeton belongs to the technical field that casing threads connects.
Background technology
Petroleum casing pipe is the necessary oil country tubular good of recover petroleum and natural gas, and petroleum casing pipe couples together by nipple, forms casing string, and it mainly acts on is the fixedly borehole wall, formation gas channel etc.In reaching thousands of meters casing string, connecting portion is a weak link wherein.
At present the casing-pipe connection structure that uses is generally according to the API standard production, is divided into API round thread joint and the API buttress thread connects first two.The thread forms of API round thread joint is the round thread form of pitch per inch 8 teeth, bearing surface angle and spigot surface angle all are 30 °, this screw thread technology maturation, processing is simple, the qualification rate height, its shortcoming is because the bearing surface angle is milder, under the tensile load effect, the radial component on the ridge is big, and the easy slippage of joint was lost efficacy, thereby bonding strength is low, is not suitable for using in deep-well.The thread forms of API buttress thread joint then is the buttress thread form of pitch per inch 5 teeth, and its bearing surface angle is 3 °, and the spigot surface angle is 10 °.This screw thread is not easy to take place slippage and lost efficacy because the bearing surface angle is little, and under the tensile load effect, the radial component on the ridge is little, and bonding strength improves greatly.But this joint sealing performance is poor, and resistant to bending scarce capacity simultaneously leaks when using in horizontal well, inclined shaft, the inefficacy of forms such as fracture, slippage easily.
For this reason, Chinese patent ZL02257690.8, notice of authorization day is on September 24th, 2003, the utility model name is called " oil casing threaded joint ", this patent disclosure a kind of oil casing threaded joint with good seal performance.This nipple is the tapered thread joint, and its tapering is the same with the API nipple, and it is formed by connecting by screw thread 1 by external thread piece P and inner thread piece B.Be characterized in that the external thread piece front end is provided with one column sealed, the correspondence position of inner thread piece is provided with the sphere primary sealing area of a projection, and the two interference fit seals.Simultaneously, the external thread piece front end face is fallen-9 or-15 ° of angles, with-9 or-15 ° of formation interference fit of inner thread piece.Compare with common API joint, the joint of this patent disclosure has increased the metal/metal hermetically-sealed construction, and sealing performance significantly improves.But because its thread forms is not significantly improved, the bending resistance of this joint is not improved.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, and a kind of resistant to bending casing threads syndeton is provided, and it is simple and compact for structure, easy to install, bonding strength height, good seal performance, bending resistance is good, and is applied widely, safe and reliable.
According to the technical scheme that the utility model provides, described resistant to bending casing threads syndeton comprises sleeve pipe and the box cupling that is fastenedly connected by screw thread and described sleeve pipe; Be provided with external screw thread, the external seal conical surface and seal face successively on the external surface of described sleeve pipe one end, described seal face is positioned at sleeve pipe corresponding to an externally threaded end end is set, and seal face links to each other with externally threaded end by the external seal conical surface; Be provided with internal thread, interior sealing cone on the inner surface of box cupling successively and reverse shoulder; Described internal thread and external screw thread are complementary, and external screw thread and internal thread all adopt the fluking type helicitic texture; Sleeve pipe stretches in the box cupling corresponding to an externally threaded end is set, and sleeve pipe is fastenedly connected by the internal thread of external screw thread and box cupling; Interior sealing cone and external seal conical surface interference fit are reversed shoulder and seal face interference fit.
After described sleeve pipe and box cupling were fastenedly connected, sleeve pipe was identical with the axis of box cupling, and the angle of the angle of the external seal conical surface and casing axis and interior sealing cone and box cupling axis is α, and α is 24 ° ~ 26 °.
The angle of described seal face and casing axis vertical line and reverse shoulder and the angle of box cupling axis vertical line is β, β is 17.5 ° ~ 18.5 °.
The bearing surface angle γ of described external screw thread and internal thread=-3.5 °, spigot surface angle θ=10 °.
Described external screw thread is identical with the pitch of internal thread, the specification of sleeve pipe is 5 ~ 9 5/8 " time, the pitch of external screw thread and internal thread is 5 tooth/inches (5.08mm), the groove width 2.67mm of internal thread; the wide 2.41mm of the tooth of internal thread, externally threaded groove width, the wide 2.54mm that is of tooth; The tooth depth of internal thread is 1.775mm, and externally threaded tooth depth is 1.575mm.
Described external screw thread is identical with the pitch of internal thread, and the specification of sleeve pipe is greater than 9 5/8 " time, the pitch of external screw thread, internal thread is 4 tooth/inches (6.35mm); The groove width of internal thread is 3.305mm, and the tooth of internal thread is wide to be 3.045mm, externally threaded groove width, the wide 3.175mm that is of tooth; The tooth depth of internal thread is 2.15mm, and externally threaded tooth depth is 1.95mm.
Advantage of the present utility model: be provided with external screw thread, the external seal conical surface and seal face successively on the external surface of sleeve pipe one end, be provided with internal thread, interior sealing cone on the inner surface of box cupling successively and reverse shoulder, internal thread and external screw thread are complementary, internal thread and external screw thread all adopt the fluking type helicitic texture, make sleeve pipe and box cupling be fastenedly connected the back under stretching and bending load effect, can not produce pernicious radial stresses, bonding strength, bending resistance significantly improve; Interior sealing cone and external seal conical surface interference fit, seal face with reverse the shoulder interference fit, guaranteed the sealing performance after sleeve pipe and box cupling are fastenedly connected, simple and compact for structure, easy to install, bonding strength height, good seal performance, bending resistance is good, and is applied widely, safe and reliable.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Fig. 2 is the structural representation of embodiment 1 internal thread.
Fig. 3 is embodiment 1 an externally threaded structural representation.
Fig. 4 is the structural representation of embodiment 2 internal threads.
Fig. 5 is embodiment 2 externally threaded structural representations.
The specific embodiment
The utility model is described in further detail below in conjunction with concrete drawings and Examples.
As shown in Figure 1: the utility model comprises sleeve pipe 1, external screw thread 2, the external seal conical surface 3, seal face 4, box cupling 5, internal thread 6, interior sealing cone 7 and reverses shoulder 8.
As shown in Figure 1: in order to reach the connection of petroleum casing pipe, sleeve pipe 1 is provided with box cupling 5, and described box cupling 5 is fastenedly connected by screw thread and sleeve pipe 1.One end external surface of sleeve pipe 1 is provided with external screw thread 2, the external seal conical surface 3 and seal face 4; External screw thread 2 extends at the axis direction of the external surface upper edge of sleeve pipe 1 sleeve pipe 1, and seal face 4 is positioned at sleeve pipe 1 corresponding to the end end that external screw thread 2 is set, and seal face 4 links to each other with external screw thread 2 by the external seal conical surface 3.Be provided with internal thread 6, interior sealing cone 7 on the inner surface of box cupling 5 successively and reverse shoulder 8, internal thread 6 is complementary with external screw thread 2; Interior sealing cone 7 is corresponding with the external seal conical surface 3.Box cupling 5 is fastenedly connected by the external screw thread 2 of internal thread 6 with sleeve pipe 1, and internal thread 6 adopts the fluking type helicitic texture with external screw thread 2, simultaneously, and the bearing surface angle γ of described external screw thread 2 and internal thread 6=-3.5 °, spigot surface angle θ=10 °; After sleeve pipe 1 and box cupling 5 are fastenedly connected, under stretching and bending load effect, can not produce pernicious radial stresses, bonding strength, bending resistance are significantly increased.During connection, sleeve pipe 1 stretches in the box cupling 5 corresponding to the end that external screw thread 2 is set, and the external screw thread 2 of sleeve pipe 1 and the 6 corresponding cooperations of the internal thread of box cupling 5 are fastenedly connected sleeve pipe 1 and box cupling 5.After sleeve pipe 1 is fastenedly connected with box cupling 5, the external seal conical surface 3 and interior sealing cone 7 interference fit, seal face 4 with reverse shoulder 8 and closely contact after the formation interference fit.After sleeve pipe 1 was fastenedly connected with box cupling 5, sleeve pipe 1 was identical with the axis of box cupling 5, and promptly sleeve pipe 1 is located along the same line with the axis of box cupling 5.
In order to improve the sealing performance of joint under crooked situation to greatest extent, the external seal conical surface 3 all is set to α with the angle of sleeve pipe 1 axis and the angle of interior sealing cone 7 and box cupling 5 axis, and α is 24 ° ~ 26 °.Simultaneously, the vertical line angle of seal face 5 and sleeve pipe 1 axis and the vertical line angle that reverses shoulder 8 and box cupling 5 axis are set to β, and β is 17.5 ° ~ 18.5 °.
The pitch of internal thread 6, external screw thread 2 is identical, when the specification of sleeve pipe 1 is 5 ~ 9 5/8 " time, the pitch of internal thread 6, external screw thread 2 is 5 tooth/inches (5.08mm), the groove width of internal thread 6 is 2.67mm; the tooth of internal thread 6 is wide to be 2.41mm, the groove width of external screw thread 2, the wide 2.54mm that is of tooth.When the specification of sleeve pipe 1 greater than 9 5/8 " time, the pitch of external screw thread 2, internal thread 6 is 4 tooth/inches (6.35mm), the groove width of internal thread 6 is 3.305mm, the tooth of internal thread 6 is wide to be 3.045mm, the groove width of external screw thread 2, the wide 3.175mm that is of tooth.The tooth depth difference of internal and external screw thread is when the specification of sleeve pipe 1 is 5～9 5/8 " time, the tooth depth of internal thread 6 is 1.775mm, the tooth depth of external screw thread 2 is 1.575mm; When the specification of sleeve pipe 1 greater than 9 5/8 " time, the tooth depth of internal thread 6 is 2.15mm, the tooth depth of external screw thread 2 is 1.95mm.
Embodiment 1
Present embodiment is the sleeve pipe 1 that is used for Ф 177.8 * 9.19 mm, and grade of steel is P110.The external diameter of sleeve pipe 1 is 177.8 mm, and the external diameter of box cupling 5 is 194.5mm, and the pitch w4 of external screw thread 2 is 5.08mm, the tooth depth h2 of external screw thread 2 is 1.575mm, the groove width w5 of external screw thread 2 is 2.54mm, and the wide w6 of the tooth of external screw thread 2 is 2.54mm, and the tapering of external screw thread 2 is 1:16.The pitch w1 of internal thread 6 is 5.08mm, and the tooth depth h1 of internal thread 6 is 1.775mm, and the tapering of internal thread 6 is 1:16, and the groove width w3 of internal thread 6 is 2.67mm, and the wide w2 of the tooth of internal thread 6 is 2.41mm.The bearing surface angle γ of internal thread 6, external screw thread 2 is-3.5 °, and spigot surface angle θ is 10 °.This sleeve pipe 1 can reach more than the 69MPa with box cupling 5 syndeton seal-air pressures, and counter-bending ability reaches 45 °/100 meters.
Present embodiment is the sleeve pipe 1 that is used for Ф 273.1 * 12.57 mm, and grade of steel is P110.The external diameter of sleeve pipe 1 is 273.1 mm, and the external diameter of box cupling 5 is 298.5mm, and the pitch w10 of external screw thread 2 is 6.35mm, the tooth depth h4 of external screw thread 2 is 1.95mm, the groove width w11 of external screw thread 2 is 3.175mm, and the wide w12 of the tooth of external screw thread 2 is 3.175mm, the tapering 1:16 of external screw thread 2.The pitch w7 of internal thread 6 is 6.35mm, and the tooth depth h3 of internal thread 6 is 2.15mm, and the wide w8 of the tooth of internal thread 6 is 3.045mm, the groove width w9 of internal thread 6 is 3.305mm, the tapering 1:16 of internal thread 6, the bearing surface angle γ of internal thread 6, external screw thread 2 is-3.5 °, spigot surface angle θ is 10 °.This sleeve pipe 1 can reach more than the 61MPa with box cupling 5 syndeton seal-air pressures, and counter-bending ability reaches 25 °/100 meters.
Be provided with external screw thread 2, the external seal conical surface 3 and seal face 4 on the external surface of the utility model sleeve pipe 1 one ends successively, be provided with internal thread 6, interior sealing cone 7 on the inner surface of box cupling 5 successively and reverse shoulder 8, internal thread 6 is complementary with external screw thread 2, internal thread 6 all adopts the fluking type helicitic texture with external screw thread 2, make sleeve pipe 1 and box cupling 5 be fastenedly connected the back under stretching and bending load effect, can not produce pernicious radial stresses, bonding strength, bending resistance significantly improve; Interior sealing cone 3 and the external seal conical surface 7 interference fit, seal face 4 with reverse shoulder 8 interference fit, guaranteed the sealing performance after sleeve pipe 1 is fastenedly connected with box cupling 5, simple and compact for structure, easy to install, the bonding strength height, good seal performance, bending resistance is good, and is applied widely, use in energy horizontal well, the inclined shaft, safe and reliable.
Claims (6)
1. a resistant to bending casing threads syndeton comprises sleeve pipe (1) and the box cupling (5) that is fastenedly connected by screw thread and described sleeve pipe (1); It is characterized in that: be provided with external screw thread (2), the external seal conical surface (3) and seal face (4) on the external surface of described sleeve pipe (1) one end successively, described seal face (4) is positioned at sleeve pipe (1) corresponding to the end end that external screw thread (2) is set, and seal face (4) links to each other with the end of external screw thread (2) by the external seal conical surface (3); Be provided with internal thread (6), interior sealing cone (7) on the inner surface of box cupling (5) successively and reverse shoulder (8); Described internal thread (6) is complementary with external screw thread (2), and external screw thread (2) all adopts the fluking type helicitic texture with internal thread (6); Sleeve pipe (1) stretches in the box cupling (5) corresponding to the end that external screw thread (2) is set, and sleeve pipe (1) is fastenedly connected by the internal thread (6) of external screw thread (2) with box cupling (5); Interior sealing cone (7) and the external seal conical surface (3) interference fit reverse shoulder (8) and seal face (4) interference fit.
2. resistant to bending casing threads syndeton according to claim 1, it is characterized in that: after described sleeve pipe (1) is fastenedly connected with box cupling (5), sleeve pipe (1) is identical with the axis of box cupling (5), the external seal conical surface (3) is α with the angle of sleeve pipe (1) axis and the angle of interior sealing cone (7) and box cupling (5) axis, and α is 24 ° ~ 26 °.
3. resistant to bending casing threads syndeton according to claim 1 and 2, it is characterized in that: the angle of described seal face (4) and sleeve pipe (1) axis vertical line and the angle that reverses shoulder (8) and box cupling (5) axis vertical line are β, and β is 17.5 ° ~ 18.5 °.
4. resistant to bending casing threads syndeton according to claim 1 is characterized in that: described external screw thread (2) is-3.5 ° with the bearing surface angle γ of internal thread (6), and spigot surface angle θ is 10 °.
5. resistant to bending casing threads syndeton according to claim 1, it is characterized in that: described external screw thread (2) is identical with the pitch of internal thread (6), the specification of sleeve pipe (1) is 5 ~ 9 5/8 " time; external screw thread (2) is 5 tooth/inches with the pitch of internal thread (6); the groove width 2.67mm of internal thread (6); the wide 2.41mm of tooth of internal thread (6), the wide 2.54mm that is of groove width, the tooth of external screw thread (2); The tooth depth of internal thread (6) is 1.775mm, and the tooth depth of external screw thread (2) is 1.575mm.
6. resistant to bending casing threads syndeton according to claim 1, it is characterized in that: described external screw thread (2) is identical with the pitch of internal thread (6), the specification of sleeve pipe (1) is greater than 9 5/8 " time, the pitch of external screw thread (2), internal thread (6) is 4 tooth/inches; The groove width of internal thread (6) is 3.305mm, and the tooth of internal thread (6) is wide to be 3.045mm, the wide 3.175mm that is of groove width, the tooth of external screw thread (2); The tooth depth of internal thread (6) is 2.15mm, and the tooth depth of external screw thread (2) is 1.95mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201010642U CN202039782U (en) | 2011-04-08 | 2011-04-08 | Anti-bending casing pipe threaded connection structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201010642U CN202039782U (en) | 2011-04-08 | 2011-04-08 | Anti-bending casing pipe threaded connection structure |
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| Publication Number | Publication Date |
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| CN202039782U true CN202039782U (en) | 2011-11-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011201010642U Expired - Lifetime CN202039782U (en) | 2011-04-08 | 2011-04-08 | Anti-bending casing pipe threaded connection structure |
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| CN (1) | CN202039782U (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102926669A (en) * | 2012-12-04 | 2013-02-13 | 江苏常宝普莱森钢管有限公司 | Triple sealing structure for lengthening steel pipes through direct connection and rotary connection |
| CN103015909A (en) * | 2012-12-25 | 2013-04-03 | 江苏和信石油机械有限公司 | 14-3/4 inch oversized caliber prospecting drill pipe |
| CN103422819A (en) * | 2013-08-30 | 2013-12-04 | 宝山钢铁股份有限公司 | Airtight connection structure for oil well pipe |
| CN104832112A (en) * | 2015-05-29 | 2015-08-12 | 聊城安泰石油机械有限公司 | ATPM-I type oil tube and sleeve sealing connection device, pipe and coupling |
| CN106461126A (en) * | 2014-06-20 | 2017-02-22 | 新日铁住金株式会社 | Threaded coupling for steel piping |
| CN106461127A (en) * | 2014-06-20 | 2017-02-22 | 新日铁住金株式会社 | Screw joint for steel piping |
| CN106461125A (en) * | 2014-05-30 | 2017-02-22 | 新日铁住金株式会社 | Metallic flexible tube |
| CN109549852A (en) * | 2017-09-27 | 2019-04-02 | 杨松 | Regular movements formula pressing device and its application method |
-
2011
- 2011-04-08 CN CN2011201010642U patent/CN202039782U/en not_active Expired - Lifetime
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102926669A (en) * | 2012-12-04 | 2013-02-13 | 江苏常宝普莱森钢管有限公司 | Triple sealing structure for lengthening steel pipes through direct connection and rotary connection |
| CN103015909A (en) * | 2012-12-25 | 2013-04-03 | 江苏和信石油机械有限公司 | 14-3/4 inch oversized caliber prospecting drill pipe |
| CN103422819A (en) * | 2013-08-30 | 2013-12-04 | 宝山钢铁股份有限公司 | Airtight connection structure for oil well pipe |
| CN103422819B (en) * | 2013-08-30 | 2016-12-07 | 宝山钢铁股份有限公司 | A kind of air-tight seal connecting structure for oil well pipe |
| CN106461125A (en) * | 2014-05-30 | 2017-02-22 | 新日铁住金株式会社 | Metallic flexible tube |
| CN106461126A (en) * | 2014-06-20 | 2017-02-22 | 新日铁住金株式会社 | Threaded coupling for steel piping |
| CN106461127A (en) * | 2014-06-20 | 2017-02-22 | 新日铁住金株式会社 | Screw joint for steel piping |
| CN106461127B (en) * | 2014-06-20 | 2018-11-16 | 新日铁住金株式会社 | Screw joint for steel pipe |
| CN106461126B (en) * | 2014-06-20 | 2018-12-21 | 新日铁住金株式会社 | Screw joint for steel pipe |
| CN104832112A (en) * | 2015-05-29 | 2015-08-12 | 聊城安泰石油机械有限公司 | ATPM-I type oil tube and sleeve sealing connection device, pipe and coupling |
| CN109549852A (en) * | 2017-09-27 | 2019-04-02 | 杨松 | Regular movements formula pressing device and its application method |
| CN109549852B (en) * | 2017-09-27 | 2023-05-02 | 杨松 | Rhythmic drug pressing device and using method thereof |
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