CN202380985U - Tubular air seal thread joint - Google Patents

Tubular air seal thread joint Download PDF

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Publication number
CN202380985U
CN202380985U CN2011203489990U CN201120348999U CN202380985U CN 202380985 U CN202380985 U CN 202380985U CN 2011203489990 U CN2011203489990 U CN 2011203489990U CN 201120348999 U CN201120348999 U CN 201120348999U CN 202380985 U CN202380985 U CN 202380985U
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CN
China
Prior art keywords
conical
sleeve pipe
seal
box cupling
combinatorial
Prior art date
Application number
CN2011203489990U
Other languages
Chinese (zh)
Inventor
步玉环
李真祥
瞿佳
孙坤忠
孔华
郭胜来
马明新
Original Assignee
中国石油化工股份有限公司
中国石油化工股份有限公司勘探南方分公司
中国石油大学(华东)
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Application filed by 中国石油化工股份有限公司, 中国石油化工股份有限公司勘探南方分公司, 中国石油大学(华东) filed Critical 中国石油化工股份有限公司
Priority to CN2011203489990U priority Critical patent/CN202380985U/en
Application granted granted Critical
Publication of CN202380985U publication Critical patent/CN202380985U/en

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Abstract

The utility model relates to a tubular air seal thread joint. The thread joint comprises a sleeve (2) and a coupling (1), wherein an external sealing combined surface (4) which comprises a first conical surface (11) and a second conical surface (12) with different taper is formed at the end of an external thread of the sleeve (2); a sleeve positioning end face (9) is formed at the end of the external sealing combined surface (4); a third conical surface (7) and a fourth conical surface (8) which have different taper and are matched with the external sealing combined surface are formed at the root of an internal thread of the coupling (1); a coupling torque-stop reverse shoulder (5) matched with the sleeve positioning end face (9) is formed at the bottom of an internal sealing combined surface (3); and the external sealing combined surface (4) of the sleeve and the internal sealing combined surface (3) of the coupling, and the sleeve positioning end face (9) and the coupling torque-stop reverse shoulder (5) are in interference fit with each other respectively. By optimizing the taper of the surfaces with different taper and the angle of the reverse shoulder, the stability of sealing performance of a sealing surface under a tensile load is improved.

Description

A kind of tubulose air-tight seal screw joint

Technical field

The utility model relates to a kind of thread seal technology, particularly relates to a kind of air-tight seal screw joint of used petroleum oil and sleeve pipe when being used for oil drilling, exploitation and production.

Background technology

Along with development of Chinese economy, the demand of natural gas is increasing, and gas extraction has become an important behave of China's energy industry.Usually natural gas need come out it through the mode of drilling well from underground mining.In drilling well and recovery process, the sleeve pipe that is used for fixing the borehole wall all is a long string that forms with being threaded with the oil pipe that is used for gas production production, and each nipple must guarantee to have reliable gas sealing ability.

Widely used on the oil field at present is the API screw thread, comprises round thread (LTC, STC), buttress thread (BTC).The API screw thread belongs to taper thread, and the contact pressure that mainly relies on matching thread field of conjugate action interference fit to produce obtains effective sealing.Because there are fit clearance in structure design, and the existence of machining tolerance between the field of conjugate action of API screw thread.In essence, the API screw thread does not have fluid (particularly gas) sealability, and the API screw thread can seal the fluid of certain pressure, mainly is the solid particle that utilizes in the thread compound, perhaps reduces these gaps through soft metals such as copper facing, zinc.But thread compound is at high temperature or in the long-term use, volatilization or rotten easily, thus cause the decline of thread seal property.

If, only rely on the cooperation of screwing of screw thread, be difficult to gas is carried out permanent effective seal not to be sealed into the sealing surface of purpose.At present, mainly adjust hermetically-sealed construction through two kinds of methods both at home and abroad: a kind of is to adopt to become the conical surface seal structure; Another kind is to adopt reverse angle shoulder.The contact pressure that adopts change cone structure and reverse shoulder can both improve to a certain extent on the special thread joint primary sealing area distributes, but when applying tensile load, adopts wherein a kind of method all can not more effectively improve the joint sealing effect separately.

The utility model content

The utility model provides a kind of special air-tight seal screw joint, and this joint will become the conical surface and reverse shoulder structure combines, and realizes the purpose that the prevention of blocking high-pressure gas was leaked when oil pipe or sleeve pipe connected.

The tubulose air-tight seal screw joint of the utility model comprises that an end has the box cupling 1 that externally threaded sleeve pipe 2 and another end have internal thread, is characterized in that:

Said sleeve pipe 2 externally threaded ends are provided with external seal combinatorial surface 4, and the end of said external seal combinatorial surface 4 is provided with sleeve pipe location end face 9, and said external seal combinatorial surface 4 comprises first conical surface 11 and second conical surface 12 of taper mutation;

The root of said box cupling 1 internal thread is provided with the interior seal combination face 3 that cooperates with said external seal combinatorial surface 4, and the bottom of said interior seal combination face 3 is provided with the box cupling that cooperates with said sleeve pipe location end face 9 and ends the reverse shoulder 5 of moment of torsion;

Seal combination face 3 comprises the third hand tap face 7 and the 4th conical surface 8 of the taper mutation that cooperates with said external seal combinatorial surface 4 in the said box cupling; The external seal combinatorial surface 4 of said sleeve pipe and the interior seal combination face 3 of the box cupling that cooperates with it are interference fit, and said sleeve pipe location end face 9 ends the reverse shoulder 5 of moment of torsion with box cupling and is interference fit.

In practical implementation,

Can be 1/10 near described second conical surface 12 of screw thread and the conical surface tapering of the 4th conical surface 8, can be 1/3 away from described first conical surface 11 of screw thread and the conical surface tapering of third hand tap face 7.

Said sleeve pipe location end face 9 can be-5 ° with the angle of sleeve pipe 2 axis.

The angle that said box cupling ends reverse shoulder 5 of moment of torsion and sleeve pipe 2 axis can be-5 °.

The radial interference amount of the seal combination face 3 and described external seal combinatorial surface 4 conical surfaces can be 0.23~0.31mm in described.

Said sleeve pipe 2 location end faces 9 can be 0.05mm with the axial magnitude of interference that described box cupling 1 ends the reverse shoulder 5 of moment of torsion.

The utility model can be used widely in the air-tight seal screw joint of air-tight seal screw joint used oil pipe, tracheae and sleeve pipe when oil, natural gas are drilled, developed and produce.

The effect of the utility model is through taper mutation face and reverse shoulder structure are combined, and through optimizing the tapering that becomes the conical surface and the angle of reverse shoulder, has improved the stability in the sealing performance of tensile load lower sealing surface.Because the screw thread in this nipple only plays interconnect function, do not seal simultaneously,, reduced the stress level of screw thread, avoid stress corrosion, improved anti-seizure performance yet so can reduce machine collar number.

Description of drawings

Fig. 1 is the sealing state figure of the utility model embodiment.

Fig. 2 is the structural representation of interior seal combination face among the utility model embodiment;

Fig. 3 is the structural representation of the utility model embodiment China and foreign countries seal combination face.

The specific embodiment

Like Fig. 1, Fig. 2, shown in Figure 3, special air-tight seal screw joint comprises the box cupling 1 and body 2 that are threaded, and the externally threaded end of said body is provided with external seal combinatorial surface 4, and the end of said external seal combinatorial surface 4 is provided with body location end face 9; The root of said box cupling 1 internal thread is provided with the interior seal combination face 3 that cooperates with said external seal combinatorial surface 4, and the bottom of said interior seal combination face 3 is provided with the box cupling that cooperates with said body location end face 9 and ends the reverse shoulder 5 of moment of torsion; Said external seal combinatorial surface 4 comprises first conical surface 11 and second conical surface 12 of taper mutation; Seal combination face 3 comprises the third hand tap face 7 and the 4th conical surface 8 of the taper mutation that cooperates with said external seal combinatorial surface 4 in said; The tapering of the said third hand tap face 7 and first conical surface 11 is 1/3, and the tapering of said the 4th conical surface 8 and second conical surface 12 is 1/10; Said body location end face 9 is the conical surface, and the angle of the said conical surface and casing axis is-5 °; Said box cupling ends the reverse shoulder 5 of moment of torsion and is the conical surface, and the angle that said box cupling ends reverse shoulder 5 of moment of torsion and sleeve pipe 2 axis is-5 °; Between the said body location end face 9 and said first conical surface 11 is external arc transition face 10; It is interior arc transition face 6 that said box cupling ends between reverse shoulder 5 of moment of torsion and the said third hand tap face 7; The radius of said external arc transition face 10 is greater than 0.5mm; The radius of arc transition face 6 is less than 0.5mm in said.When body and box cupling screwing hermetic, said interior seal combination face 3 and external seal combinatorial surface 4 interference fit that cooperate with it, said interference fit radial interference amount is 0.23~0.31mm; Said body location end face 9 ends the reverse shoulder 5 of moment of torsion with box cupling and adopts interference fit, and the axial magnitude of interference of said interference fit is 0.05mm.

Claims (7)

1. tubulose air-tight seal screw joint comprises that an end has the box cupling (1) that externally threaded sleeve pipe (2) and another end have internal thread, is characterized in that:
The externally threaded end of said sleeve pipe (2) is provided with external seal combinatorial surface (4), and the end of said external seal combinatorial surface (4) is provided with sleeve pipe location end face (9), and said external seal combinatorial surface (4) comprises first conical surface (11) and second conical surface (12) of taper mutation;
The root of said box cupling (1) internal thread is provided with the interior seal combination face (3) that cooperates with said external seal combinatorial surface (4), and the bottom of said interior seal combination face (3) is provided with the box cupling that cooperates with said sleeve pipe location end face (9) and ends the reverse shoulder of moment of torsion (5);
Seal combination face (3) comprises the third hand tap face (7) and the 4th conical surface (8) of the taper mutation that cooperates with said external seal combinatorial surface (4) in the said box cupling; The external seal combinatorial surface (4) of said sleeve pipe and the interior seal combination face (3) of the box cupling that cooperates with it are interference fit, and said sleeve pipe location end face (9) ends the reverse shoulder of moment of torsion (5) with box cupling and is interference fit.
2. air-tight seal screw joint as claimed in claim 1 is characterized in that:
Near described second conical surface (12) of screw thread and the conical surface tapering of the 4th conical surface (8) is 1/10, is 1/3 away from described first conical surface (11) of screw thread and the conical surface tapering of third hand tap face (7).
3. air-tight seal screw joint as claimed in claim 1 is characterized in that:
Said sleeve pipe location end face (9) is-5 ° with the angle of sleeve pipe (2) axis.
4. air-tight seal screw joint as claimed in claim 1 is characterized in that:
The angle that said box cupling ends reverse shoulder of moment of torsion (5) and sleeve pipe (2) axis is-5 °.
5. air-tight seal screw joint as claimed in claim 1 is characterized in that:
The radial interference amount of the seal combination face (3) and described external seal combinatorial surface (4) conical surface is 0.23~0.31mm in described.
6. air-tight seal screw joint as claimed in claim 1 is characterized in that:
Said sleeve pipe (2) location end face (9) is 0.05mm with the axial magnitude of interference that described box cupling (1) ends the reverse shoulder of moment of torsion (5).
7. air-tight seal screw joint as claimed in claim 2 is characterized in that:
Said sleeve pipe location end face (9) is-5 ° with the angle of sleeve pipe (2) axis;
The angle that said box cupling ends reverse shoulder of moment of torsion (5) and sleeve pipe (2) axis is-5 °;
The radial interference amount of the seal combination face (3) and described external seal combinatorial surface (4) conical surface is 0.23~0.31mm in described;
Said sleeve pipe (2) location end face (9) is 0.05mm with the axial magnitude of interference that described box cupling (1) ends the reverse shoulder of moment of torsion (5).
CN2011203489990U 2011-09-16 2011-09-16 Tubular air seal thread joint CN202380985U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2011203489990U CN202380985U (en) 2011-09-16 2011-09-16 Tubular air seal thread joint

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2011203489990U CN202380985U (en) 2011-09-16 2011-09-16 Tubular air seal thread joint

Publications (1)

Publication Number Publication Date
CN202380985U true CN202380985U (en) 2012-08-15

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102996079A (en) * 2011-09-16 2013-03-27 中国石油化工股份有限公司 Tubular air sealing screwed joint and application thereof
CN103321587A (en) * 2013-07-16 2013-09-25 无锡西姆莱斯石油专用管制造有限公司 Plane-shoulder planoconic sealing surface variable-tooth-width wedge-type coupling structure and oil well pipe structure
CN103321590A (en) * 2013-07-16 2013-09-25 无锡西姆莱斯石油专用管制造有限公司 Non-planar sealing surface tooth-variable wide-wedge coupling structure and oil well pipe structure
CN103362458A (en) * 2013-08-03 2013-10-23 无锡西姆莱斯石油专用管制造有限公司 Multi-plane sealing tooth-width-changing wedge type coupling structure and oil well pipe structure
CN103362453A (en) * 2013-08-03 2013-10-23 无锡西姆莱斯石油专用管制造有限公司 Sealing variable-tooth-width wedge type coupling structure and oil well pipe structure
CN103362457A (en) * 2013-08-03 2013-10-23 无锡西姆莱斯石油专用管制造有限公司 Cambered surface and plane sealed variable tooth wide wedge-type coupling structure and oil well pipe structure
CN103362455A (en) * 2013-08-03 2013-10-23 无锡西姆莱斯石油专用管制造有限公司 Bending-resistant high-sealing variable-tooth-width wedge type coupling structure and oil well pipe structure
CN103362459A (en) * 2013-08-03 2013-10-23 无锡西姆莱斯石油专用管制造有限公司 Arc-shaped conical surface sealed variable tooth wide wedge-type coupling structure and oil well pipe structure
CN107795286A (en) * 2017-11-21 2018-03-13 西南石油大学 A kind of direct linkage type tubing and casing multistage air-tight structure

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102996079A (en) * 2011-09-16 2013-03-27 中国石油化工股份有限公司 Tubular air sealing screwed joint and application thereof
CN103321587A (en) * 2013-07-16 2013-09-25 无锡西姆莱斯石油专用管制造有限公司 Plane-shoulder planoconic sealing surface variable-tooth-width wedge-type coupling structure and oil well pipe structure
CN103321590A (en) * 2013-07-16 2013-09-25 无锡西姆莱斯石油专用管制造有限公司 Non-planar sealing surface tooth-variable wide-wedge coupling structure and oil well pipe structure
CN103321587B (en) * 2013-07-16 2015-04-15 无锡西姆莱斯石油专用管制造有限公司 Plane-shoulder planoconic sealing surface variable-tooth-width wedge-type coupling structure and oil well pipe structure
CN103362453A (en) * 2013-08-03 2013-10-23 无锡西姆莱斯石油专用管制造有限公司 Sealing variable-tooth-width wedge type coupling structure and oil well pipe structure
CN103362457A (en) * 2013-08-03 2013-10-23 无锡西姆莱斯石油专用管制造有限公司 Cambered surface and plane sealed variable tooth wide wedge-type coupling structure and oil well pipe structure
CN103362455A (en) * 2013-08-03 2013-10-23 无锡西姆莱斯石油专用管制造有限公司 Bending-resistant high-sealing variable-tooth-width wedge type coupling structure and oil well pipe structure
CN103362459A (en) * 2013-08-03 2013-10-23 无锡西姆莱斯石油专用管制造有限公司 Arc-shaped conical surface sealed variable tooth wide wedge-type coupling structure and oil well pipe structure
CN103362453B (en) * 2013-08-03 2015-04-15 无锡西姆莱斯石油专用管制造有限公司 Sealing variable-tooth-width wedge type coupling structure and oil well pipe structure
CN103362458A (en) * 2013-08-03 2013-10-23 无锡西姆莱斯石油专用管制造有限公司 Multi-plane sealing tooth-width-changing wedge type coupling structure and oil well pipe structure
CN103362458B (en) * 2013-08-03 2015-06-17 无锡西姆莱斯石油专用管制造有限公司 Multi-plane sealing tooth-width-changing wedge type coupling structure and oil well pipe structure
CN107795286A (en) * 2017-11-21 2018-03-13 西南石油大学 A kind of direct linkage type tubing and casing multistage air-tight structure

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