CN2743655Y - Connecting structure of full even diameter straight joining type casing thread - Google Patents
Connecting structure of full even diameter straight joining type casing thread Download PDFInfo
- Publication number
- CN2743655Y CN2743655Y CN 200320112138 CN200320112138U CN2743655Y CN 2743655 Y CN2743655 Y CN 2743655Y CN 200320112138 CN200320112138 CN 200320112138 CN 200320112138 U CN200320112138 U CN 200320112138U CN 2743655 Y CN2743655 Y CN 2743655Y
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- thread
- casing
- sealing cone
- internal
- torque shoulder
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Abstract
The utility model provides a connecting structure of full even diameter straight joining type casing thread, which comprises a casing A and a casing B. The rotating connection point between the outer thread on the end of the casing A and the inner thread on the end of the casing B is full even diameter, an inner sealing cone is arranged ahead the small end of the inner thread on the end of the casing B, and the end of the inner sealing cone is provided with an inner torque shoulder. An outer sealing cone is arranged ahead the outer thread on the end of the casing A, the big end of the outer thread is provided with an outer torque shoulder, and the inner sealing cone and inner torque shoulder of the inner thread are contacted with the outer sealing cone and the outer torque shoulder of the outer thread. The beneficial effects are that because of the connecting structure of full even diameter straight joining type air seal thread, the straight joining type casing has no need of couplings, and the performance of air seal is high by adopting the connecting method of metal and metal seal. Owing to the torque shoulders with fixed angles, the accurate positioning of rotating connection can be ensured and the sealing ability can be strengthened simultaneously. The utility model can maximumly decrease the occurrence possibility of thread gluing of the threads, increase the wear-resistant capability of the threads, and reduce the adverse effect caused by the blocked thread oil when rotating connected.
Description
Technical field
The utility model relates to the linkage structure of the hermetic seal congruence footpath extreme line casing thread of seal for pipe joints linkage structure, particularly a kind of petroleum casing pipe.
Background technique
Along with oil industry rapid development and demand of market competition, the especially exploitation of gas well, also more and more higher to the requirement of OCTG, the sleeve pipe of general API standard series has two kinds of Connecting format, i.e. the direct-connected sleeve pipe of box cupling adapter sleeve and external upset (EU).These two kinds of Connecting format are by a common characteristic, and promptly the external diameter of the thickened portion of box cupling or pipe end is greater than the nominal diameter (external diameter) of sleeve pipe.In the oil gas well mining process, the aperture of drilling well must assurance casing string total length can be passed through smoothly, and the diameter of wellhole will be the external diameter decision of the external diameter or the body thickened portion of box cupling by the maximum diameter on the casing string.Because the increasing of oil gas well mining difficulty constantly increases cost.And the bore diameter that reduces the oil gas well is one of the most effective scheme that reduces cost.Existing casing-pipe connection structure all can not satisfy, and not changing under the preceding topic of casing string nominal diameter, reduces the requirement of bore diameter.Thereby need a kind of new casing Placement that can satisfy above-mentioned requirements.
Summary of the invention
For solving the problem that exists in the above-mentioned technology, the purpose of this utility model provides a kind of sleeve pipe and oil pipe that oil, gas well have the direct-connected molded cannula screw connection structure in congruence footpath of gas sealing ability that be used for, and can not use common box cupling adapter sleeve or external upset (EU) adapter sleeve.
For achieving the above object, the technical solution adopted in the utility model provides the linkage structure of a kind of congruence footpath extreme line casing thread, comprise sleeve A and sleeve pipe B, wherein: described sleeve A end outside thread and sleeve pipe B end internal thread are screwed, twist the place of connecing and be the congruence footpath, small end the place ahead of described sleeve pipe B sleeve pipe B end internal thread is provided with sealing cone, is provided with the internal torque shoulder in the end of interior sealing cone; There is the external sealed conical surface in described outside thread the place ahead, torque shoulder outside the big end of outside thread is processed with, and sealing cone and internal torque platform contact with the outside thread external sealed conical surface and outer torque shoulder in the internal thread.
Described internal and external screw thread constitutes by buttress thread; The outer torque shoulder of internal thread internal torque shoulder and outside thread is 75 ° to 105 ° angles.
The tapering of the sealing cone and the outside thread external sealed conical surface is 1: 10 in the described internal thread.
The advantage of the linkage structure of congruence of the present utility model footpath extreme line casing thread:
1, bore and external diameter are in full accord on whole tubing string, are different from normally used box cupling adapter sleeve or external upset (EU) adapter sleeve.Solved because local external diameter increases the problem that causes wellhole total length bore to strengthen in the joint, promptly reduced the drilling well bore, reduced the oil gas well mining cost.
2,, can reduce by 1/2 amount of finish, improve productivity owing to do not need box cupling.
3, improved sealability, the gas that can be implemented under the high pressure does not leak.
Because be the linkage structure of congruence footpath direct linkage type hermetic seal screw thread, the Placement of employing is metal and metallic seal, sealing is reliable, the gas sealing ability height; Owing to 75 ° of torque shoulder to 105 ° of angles are arranged, thereby have guaranteed that accurate twisting connects the location, also strengthened sealability simultaneously.Adopt this structural design, can reduce the possibility of screw thread generation thread gluing to greatest extent, and improved the antiwear property of screw thread, reduced to twist connecing the back by the adverse effect that dope produced of shutoff.
Description of drawings
Fig. 1 is an internal thread semi-section schematic representation;
Fig. 2 is an outside thread semi-section schematic representation;
Fig. 3 is an internal and external threads linking portion schematic representation;
Fig. 4 is the partial enlarged drawing of Fig. 3.
Among the figure:
1, outside thread 2, internal thread 3, buttress thread
4, interior sealing cone 5, internal torque shoulder 6, the external sealed conical surface
7, outer torque shoulder
Embodiment
Reaching embodiment in conjunction with the accompanying drawings is illustrated the congruent directly linkage structure of extreme line casing thread of the present utility model.
For realizing the purpose of this utility model, the linkage structure of this congruence footpath extreme line casing thread is a kind of petroleum casing pipe of design and oil pipe, its structure is shown in Fig. 1,2,3,4, sleeve A end outside thread 1 screws with sleeve pipe B end internal thread 2 and is screwed, twist the place of connecing and be the congruence footpath, small end the place ahead of sleeve pipe B end internal thread 2 is provided with sealing cone 4, is provided with internal torque shoulder 5 in the end of interior sealing cone 4; There is the external sealed conical surface 6 in outside thread 1 the place ahead of described sleeve A end, torque shoulder 7 outside outside thread 1 big end is processed with, and sealing cone 4 and internal torque platform 5 contact with the outside thread 1 external sealed conical surface 6 and outer torque shoulder 7 in the internal thread 2.Internal and external screw thread constitutes by buttress thread 3, and internal thread internal torque shoulder 5 is 75 ° to 105 ° angles with the outer torque shoulder 7 of outside thread, and the tapering of the sealing cone 4 and the outside thread external sealed conical surface 6 is 1: 10 in the internal thread.
The utility model petroleum casing pipe air-tight seal screw joint adopts the Placement of extreme line casing thread, and its internal diameter and external diameter be no change on the tubing string total length, adopts the direct linkage type sleeve pipe not need box cupling.Internal and external threads constitutes by inclined to one side ladder lock type 3, at sealing cone 4 of internal thread the place ahead miner diameter end processing, be processed with internal torque shoulder 5 in the end of interior sealing cone 4, there is the external sealed conical surface 6 in outside thread the place ahead of described cannula tip, torque shoulder 7 outside the big end of its screw thread is processed with.Sealing cone 4 and internal torque shoulder 5 contact with the outside thread external sealed conical surface 6 and outer torque shoulder 7 in the internal thread.Simultaneously, internal thread internal torque shoulder 5 is 75 ° to 105 ° angles with the outer torque shoulder 7 of outside thread.
The tapering of the interior sealing cone 4 of internal thread and the outside thread external sealed conical surface 6 is 1: 10 among Fig. 2, and the measurement diameter of interior sealing cone 4 is less than the measurement diameter of outside thread external sealed face 6.The measurement diameter of the interior sealing cone 4 and the external sealed conical surface 6 can satisfy the requirement of gas seal according to the tolerance processing of design with the magnitude of interference between the sealing cone 4 in guaranteeing and the external sealed conical surface 6.Internal torque shoulder 5 provides accurate localization, twist connect after, sealing cone 4 and 6 diameter magnitude of interference are in the scope of a designing requirement.Internal torque shoulder 5, outer torque shoulder 7 are designed to 75 ° to 105 ° corner structures, can strengthen the sealability of metal-metallic seal.
The connecting thread of direct linkage type hermetic seal screw thread part is because what use is inclined to one side ladder lock type, and when the wall thickness of body during in certain scope, the join strength that this hermetic seal is threaded is higher than the yield strength of body.
Implement the direct-connected molded cannula screw connection structure in congruence of the present utility model footpath and can adopt following data:
The internal thread of the linkage structure of congruence footpath extreme line casing thread adopts inclined to one side acme thread, and the angle that the angle of carrying side is 3 °, import the side is that 10 °, the pitch of screw thread are that 0.200in, the thickness of screw thread on the effective diameter of thread line are that the height of 0.100in, screw thread is that the tapering of 0.062in, screw thread is 0.0625in/in.The angle that the outside thread that special direct linkage type hermetic seal is threaded is same, and to adopt inclined to one side acme thread, the angle of carrying side be 3 °, import the side is that 10 °, the pitch of screw thread are that 0.200in, the thickness of screw thread on the effective diameter of thread line are that the tapering of 0.099in, screw thread is 0.0625in/in.For improving the congruence directly wear resistance and the sealability of the linkage structure of extreme line casing thread, the tooth depth of internal thread is slightly higher than outside thread tooth depth.
Claims (4)
1, a kind of congruent directly linkage structure of extreme line casing thread comprises sleeve A and sleeve pipe B, and it is characterized in that: described sleeve A end outside thread (1) is screwed with sleeve pipe B end internal thread (2), twists the place of connecing for directly congruent; Small end the place ahead of described sleeve pipe B end internal thread (2) is provided with sealing cone (4), is provided with internal torque shoulder 5 in the end of interior sealing cone (4); There is the external sealed conical surface (6) in outside thread (1) the place ahead of described sleeve A end, torque shoulder (7) outside the big end of outside thread (1) is processed with, interior sealing cone of internal thread (2) (4) and internal torque platform (5) contact with outside thread (1) the external sealed conical surface (6) and outer torque shoulder (7).
2, the congruent directly linkage structure of extreme line casing thread according to claim 1, it is characterized in that: internal and external screw thread constitutes by buttress thread (3).
3, the linkage structure of congruence footpath according to claim 1 extreme line casing thread, it is characterized in that: internal thread internal torque shoulder (5) is that 75 degree are to 105 degree angles with the outer torque shoulder (7) of outside thread.
4, the direct-connected molded cannula screw connection structure in congruence footpath according to claim 1, it is characterized in that: the tapering of the sealing cone (4) and the outside thread external sealed conical surface (6) is 1: 10 in the internal thread.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320112138 CN2743655Y (en) | 2003-11-07 | 2003-11-07 | Connecting structure of full even diameter straight joining type casing thread |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320112138 CN2743655Y (en) | 2003-11-07 | 2003-11-07 | Connecting structure of full even diameter straight joining type casing thread |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2743655Y true CN2743655Y (en) | 2005-11-30 |
Family
ID=35633674
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200320112138 Expired - Lifetime CN2743655Y (en) | 2003-11-07 | 2003-11-07 | Connecting structure of full even diameter straight joining type casing thread |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2743655Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN114440015A (en) * | 2020-11-05 | 2022-05-06 | 中国石油化工股份有限公司 | High-temperature-resistant bismaleimide resin fiber reinforced nonmetal oil pipe and manufacturing method thereof |
-
2003
- 2003-11-07 CN CN 200320112138 patent/CN2743655Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN114440015A (en) * | 2020-11-05 | 2022-05-06 | 中国石油化工股份有限公司 | High-temperature-resistant bismaleimide resin fiber reinforced nonmetal oil pipe and manufacturing method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: TIANJIN STEEL TUBE GROUP CO., LTD. Free format text: FORMER NAME: TIANJIN PIPE CO., LTD. |
|
| CP03 | Change of name, title or address |
Address after: Jintang Road, Dongli District, Tianjin, China: 300301 Patentee after: Tianjin Steel Pipe Group Co., Ltd. Address before: Jintang Road, Dongli District, Tianjin, China: 300301 Patentee before: Tianjin steel Pipe Co., Ltd. |
|
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20131107 Granted publication date: 20051130 |