CN201874485U - Metal sealed casing threaded connecting structure based on API (American Petroleum Institute) standard round threads - Google Patents
Metal sealed casing threaded connecting structure based on API (American Petroleum Institute) standard round threads Download PDFInfo
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- CN201874485U CN201874485U CN 201020641460 CN201020641460U CN201874485U CN 201874485 U CN201874485 U CN 201874485U CN 201020641460 CN201020641460 CN 201020641460 CN 201020641460 U CN201020641460 U CN 201020641460U CN 201874485 U CN201874485 U CN 201874485U
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Abstract
The utility model relates to a metal sealed casing threaded connecting structure based on API (American Petroleum Institute) standard round threads. A special air-tight casing with a threaded connector is commonly replaced by adding thread sealing grease on API long round threads currently in an oilfield, a spiral leakage channel exists between the top and the bottom of the threads in the structure, a threaded connector slides or deforms under the action of a load, the thread grease can be gradually volatized or deteriorated, and accordingly, the sealing performance of the threads is reduced or fails. An inner cylindrical sealing section of the metal sealed casing threaded connecting structure is divided into two symmetric sections, a cylindrical pipe section is arranged at a root of internal threads, an inner conical surface section is arranged between the inner cylindrical sealing section and the cylindrical pipe section, and the cylindrical sealing section is connected with the inner conical surface section by a transitional circular arc. The metal sealed casing threaded connecting structure improves airtight sealing performance, is low in processing difficulty, high in processing efficiency, low in cost, convenient in maintenance and simple in operation, reduces annular stress of a threaded connector, decreases stress corrosion sensitivity of the threaded connector, and improves thread-gluing resistance of the threaded connector.
Description
Technical field
The utility model relates to a kind of metallic sleeve gasket threaded connection structure based on API standard round screw thread, is mainly used in petroleum industry oil well pipe thread link technique field.
Background technology
In recent years, the exploitation dynamics of domestic natural gas continued to increase, and had found a large amount of low-permeability oil gas fields at the block that with long celebrating large-scale gas field, oil field serves as typical case's representative, and its principal character is low pressure, hypotonic, low yield, gas well general requirements stable yields 3 years.Therefore, the oil field is under the prerequisite that satisfies the safety in production requirement, require to reduce as far as possible the tubing cost, and the airtight oil sealing of typical special thread joint, the sleeve pipe of supply in the market comprise that problem such as the higher and interchangeability of the price of products such as VAM series, NK3SB, FOX and TPCQ has restricted promoting the use of of special thread joint coupling.The oil field is generally adopted the oval screw thread of API to add schemes such as sealing thread compound and is substituted special thread joint hermetic seal sleeve pipe at present, the major defect of this scheme is, reason owing to the oval helicitic texture design of API, there is the spirality leakage between at the bottom of the thread crest of engagement and the tooth, though thread compound can stop up the leakage of existence to a certain extent and form sealing, but nipple screw thread under Action of Combined Loads will take place to slide or distortion, thread pitch and contact pressure are changed, thread compound also can volatilize gradually in high temperature and long service process or be rotten in addition, these factors all produce harmful effect with the sealing performance of double thread, even lose sealing function.
Summary of the invention
The utility model will provide a kind of metallic sleeve gasket threaded connection structure based on API standard round screw thread, to solve the unfavorable problem of sealing performance that prior art exists.
For achieving the above object, the utility model adopts following technical scheme:
A kind of metallic sleeve gasket threaded connection structure that the utility model provides based on API standard round screw thread, comprise two bodys and box cupling, body is provided with external screw thread, box cupling is provided with internal thread, it is characterized in that: the internal thread on the described box cupling is by interior column sealed section in the middle of the box cupling two sections of being divided into symmetry, the internal thread root is provided with the cylinder pipeline section, is provided with the inner conical surface section between interior column sealed section and the cylinder pipeline section, and cylindrical section is connected by transition arc with the inner conical surface section; The proboscis end has been designed in externally threaded end on the described body, the end of proboscis end is provided with the male cone (strobilus masculinus) section, being provided with spherical sealing surface in male cone (strobilus masculinus) section inboard, is the cylindrical shell of column between spherical sealing surface and the external screw thread, and spherical sealing surface and cylinder pipeline section form the metal interference fit; The end face of two bodys is formed centrally the interference butt joint and cooperates in box cupling.
The utility model has designed the proboscis end at the end direction of body, screw back pipe end face and flush with the box cupling central plane, in the Position Design of close body end face the male cone (strobilus masculinus) section, be beneficial to into button.After button screwed on body and the box cupling, the end face of external screw thread and internal thread, spherical sealing surface and interior column sealed section, two body formed triple-heavy metal interference fit, i.e. triple seal respectively.
Compared with prior art, this structure has marked improvement, is in particular in the following aspects:
Advantages such as 1) this screw connection structure has kept API standard round screw thread technology maturation, in-process measurement is simple, interchangeability is strong, easy to operate and low price, simultaneously, having significantly improved its gas sealing ability, is that a kind of economical hermetic seal casing threads with high cost performance connects;
2) sphere/cylinder metallic seal design has solved to twist and has connect the wayward sealing surface magnitude of interference fluctuation problem that causes in position, guaranteed that the basic maintenance in the design seal length of the sealing surface magnitude of interference is even, be aided with pipe end again to pushing up the end face seal that the back forms, significantly improved the gas sealing ability and the sealing reliability that are threaded;
3) the utility model structure is simple in structure, has adopted no torque shoulder design, and difficulty of processing is little, has improved working (machining) efficiency, has reduced processing cost, and is easy to maintenance;
3) on-the-spot end screw thread can exchange with API standard round screw thread, can directly be used with the existing power tool in oil field, annex, and is simple to operate, makes things convenient for the oil field to use;
4) reduce the screw thread magnitude of interference, reduced the circumference stress of nipple, reduced the Sensitivity of Stress Corrosion of nipple, improved the anti-stick button ability of nipple.
Description of drawings:
Fig. 1 is a standard A PI round thread syndeton schematic diagram
Fig. 2 is the box cupling structural representation;
Fig. 3 is the local enlarged diagram of box cupling;
Fig. 4 is the pipe structure schematic diagram;
Fig. 5 is the local enlarged diagram of body;
Fig. 6 is the utility model overall structure schematic diagram.
Description of drawings is as follows:
The 1-box cupling, 2-body, 3-cylinder pipeline section, 4-inner conical surface section, 5-cylindrical section, 6-body end face, 7-cylindrical shell of column, 8-male cone (strobilus masculinus) section, the spherical sealing surface of 9-, 10-transition arc.
The specific embodiment:
Below in conjunction with accompanying drawing the utility model is described in detail.
Referring to Fig. 1, comprise two bodys 2 and box cupling 1 in the prior art, body 2 is provided with external screw thread, and box cupling 1 is provided with internal thread.
Referring to Fig. 2～Fig. 6, a kind of metallic sleeve gasket threaded connection structure based on API standard round screw thread, comprise two bodys 2 and box cupling 1, body 2 is provided with external screw thread, box cupling 1 is provided with internal thread, it is characterized in that: the internal thread on the described box cupling 1 is by interior column sealed section 5 in the middle of the box cupling 1 two sections of being divided into symmetry, the internal thread root is provided with cylinder pipeline section 3, in be provided with inner conical surface section 4 between column sealed section 5 and the cylinder pipeline section 3, cylindrical section 5 is connected by transition arc 10 with inner conical surface section 4; The proboscis end has been designed in externally threaded end on the described body 2, the end of proboscis end is provided with male cone (strobilus masculinus) section 8, being provided with spherical sealing surface 9 in male cone (strobilus masculinus) section 8 inboards, is cylindrical shell of column 7 between spherical sealing surface 9 and the external screw thread, and spherical sealing surface 9 forms the metal interference fit with cylinder pipeline section 5; The end face 6 of two bodys 2 is formed centrally the interference butt joint and cooperates in box cupling 1.
The utility model in use, after button on body 1 and the box cupling 2 screwed, the end face 6 of external screw thread and internal thread, spherical sealing surface 9 and interior column sealed section 5, two bodys 1 formed triple-heavy metal interference fit, i.e. triple seal respectively.
A kind of concrete structure of product of specification is provided below:
Product specification is 139.7mm * 9.17mm, and grade of steel is J55.The physical dimension of body 2 and box cupling 1 and material property are according to API 5CT standard-required.8 pitch threads on per 25.4 mm length, thread taper is 1:16, and the form of thread angular bisector is perpendicular to the axis of thread, and the form of thread angle is 60 °, and the form of thread height is 1.81mm, the screw thread magnitude of interference is selected 0.12mm～0.15 mm.Body 2 end faces are 90 °, and the tapering of the male cone (strobilus masculinus) section that the end of its proboscis end is provided with is 1/10, and body 2 external screw thread spherical diameters are 200 mm.
Claims (1)
1. metallic sleeve gasket threaded connection structure based on API standard round screw thread, comprise two bodys (2) and box cupling (1), body (2) is provided with external screw thread, box cupling (1) is provided with internal thread, it is characterized in that: the internal thread on the described box cupling (1) is divided into two sections of symmetry by interior column sealed section (5) in the middle of the box cupling (1), the internal thread root is provided with cylinder pipeline section (3), be provided with inner conical surface section (4) between interior column sealed section (5) and the cylinder pipeline section (3), cylindrical section (5) is connected by transition arc (10) with inner conical surface section (4); The proboscis end has been designed in externally threaded end on the described body (2), the end of proboscis end is provided with male cone (strobilus masculinus) section (8), be provided with spherical sealing surface (9) in male cone (strobilus masculinus) section (8) inboard, between spherical sealing surface (9) and the external screw thread is cylindrical shell of column (7), and spherical sealing surface (9) forms the metal interference fit with cylinder pipeline section (5); The end face (6) of two bodys (2) is formed centrally the interference butt joint and cooperates in box cupling (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201020641460 CN201874485U (en) | 2010-12-05 | 2010-12-05 | Metal sealed casing threaded connecting structure based on API (American Petroleum Institute) standard round threads |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201020641460 CN201874485U (en) | 2010-12-05 | 2010-12-05 | Metal sealed casing threaded connecting structure based on API (American Petroleum Institute) standard round threads |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201874485U true CN201874485U (en) | 2011-06-22 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201020641460 Expired - Lifetime CN201874485U (en) | 2010-12-05 | 2010-12-05 | Metal sealed casing threaded connecting structure based on API (American Petroleum Institute) standard round threads |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201874485U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102587845A (en) * | 2012-03-16 | 2012-07-18 | 西安摩尔石油工程实验室有限公司 | Air-sealing casing screwed connector interchangeable with API (American petroleum institute) round thread |
| CN104153716A (en) * | 2014-07-28 | 2014-11-19 | 聊城安泰石油机械有限公司 | Tubing and casing sealing coupling |
| US10119637B2 (en) | 2013-12-10 | 2018-11-06 | Vallourec Oil And Gas France | Assembly for producing a threaded connection for drilling and operating hydrocarbon wells, and resulting threaded connection |
| CN111120747A (en) * | 2020-01-19 | 2020-05-08 | 成都市卓新实业有限公司 | Anti-turbulent pipeline |
-
2010
- 2010-12-05 CN CN 201020641460 patent/CN201874485U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102587845A (en) * | 2012-03-16 | 2012-07-18 | 西安摩尔石油工程实验室有限公司 | Air-sealing casing screwed connector interchangeable with API (American petroleum institute) round thread |
| US10119637B2 (en) | 2013-12-10 | 2018-11-06 | Vallourec Oil And Gas France | Assembly for producing a threaded connection for drilling and operating hydrocarbon wells, and resulting threaded connection |
| CN104153716A (en) * | 2014-07-28 | 2014-11-19 | 聊城安泰石油机械有限公司 | Tubing and casing sealing coupling |
| CN111120747A (en) * | 2020-01-19 | 2020-05-08 | 成都市卓新实业有限公司 | Anti-turbulent pipeline |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20201125 Address after: 100000 Beijing City, Xicheng District shop kang six Patentee after: CHINA NATIONAL PETROLEUM Corp. Patentee after: BAOJI PETROLEUM STEEL PIPE Co.,Ltd. Address before: 721013, Binhe Road, hi tech Zone, Shaanxi, Baoji, 1 Patentee before: BAOJI PETROLEUM STEEL PIPE Co.,Ltd. |
|
| TR01 | Transfer of patent right | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110622 |
|
| CX01 | Expiry of patent term |