CN204082030U - A kind of air sealed threaded sleeve joint - Google Patents
A kind of air sealed threaded sleeve joint Download PDFInfo
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- CN204082030U CN204082030U CN201420359589.XU CN201420359589U CN204082030U CN 204082030 U CN204082030 U CN 204082030U CN 201420359589 U CN201420359589 U CN 201420359589U CN 204082030 U CN204082030 U CN 204082030U
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- cone seal
- seal section
- box cupling
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Abstract
The utility model discloses a kind of air sealed threaded sleeve joint, comprise box cupling and two bodys, the inner surface of box cupling is divided into two symmetrical cross-talk inner surfaces by the mid-plane of box cupling, and sub-inner surface comprises the internal thread segment, cylinder pipeline section, the first right angle torque resistant shoulder and the first cone seal section that are set gradually to middle part by the end of box cupling; The end outer surface of body comprises the second cone seal section, the second right angle torque resistant shoulder and the external thread section that are set gradually to middle part by the end of body; Internal thread segment and external thread section are the buttress thread of working in coordination; When two bodys are connected respectively to the two ends of box cupling, first right angle torque resistant shoulder and the second right angle torque resistant shoulder are worked in coordination, for interference fit forms main seal structure between first cone seal section and the second cone seal section, the end face of two bodys forms interference docking and coordinates at the mid-plane place of box cupling.The utility model bonding strength is high, be easy to processing and detect, and sealing effectiveness is stablized.
Description
Technical field
The utility model relates to the water-tight equipment in petroleum and natural gas industry, more particularly, relates to and is a kind ofly improved the air sealed threaded sleeve joint obtained by API standard buttress thread.
Background technology
The sleeve pipe that past petroleum industry uses mainly adopts API buttress thread to connect, API buttress thread due to its technology maturation, be easy to processing, the advantage such as easy to maintenance, interchangeability good, easy to operate, cost is lower, be widely used within a very long time and obtain good effect.
But API buttress thread is due to structure design aspect, there is many defects being difficult to overcome.Fig. 1 shows existing common API standard buttress thread joint design, it comprises box cupling 1 and two bodys 2, the inner surface of box cupling 1 is symmetrically arranged with internal thread, the external surface of body 2 is provided with external screw thread, two bodys can form in the center of box cupling the annular clearance that is about 25.4mm after button, also namely it can cause the problems such as unreliable in sealing performance, joint stress level is high, cause internal flow turbulent, thus causes the loss of energy.Therefore the use of API buttress thread is greatly limited in recent years, force people to develop and use the special thread oil pipe and sleeve pipe that have compared with high leakproofness, but cost of production also significantly increases thereupon.
Raising along with oil field prospecting degree and the continuous growth to petroleum resources demand, Low Permeability Oil/gas resource has become the main object of China's oil-gas exploration and development.Because low-permeability oilfield has three low particularity " low abundance, low pressure, low yield ", need to adopt special production practice, common API buttress thread is difficult to meet exploitation requirement.Although domestic and international each producer have developed dissimilar Special threading connector respectively, because it is for the production of common API buttress thread, not only inefficiency, and also expensive, therefore be also not too suitable for the exploitation of Low Permeability Oil/gas resource.
Therefore, need to provide a kind of bonding strength high, be easy to processing and detect, the economical air sealed threaded sleeve joint of hermetic seal effect stability.
Utility model content
For deficiency of the prior art, one or more during the purpose of this utility model is to solve the problems of the technologies described above.
The purpose of this utility model is to solve defect and the problems such as existing API buttress thread sealing performance is unreliable, joint stress level is high, the loss of internal flow turbulent energy, by the improvement of API buttress thread is provided a kind of bonding strength high, be easy to processing and detect, the economical air sealed threaded sleeve joint of hermetic seal effect stability.
To achieve these goals, the utility model provides a kind of air sealed threaded sleeve joint, described nipple comprises box cupling and two bodys, the two ends of described box cupling are threaded with described two bodys respectively, the inner surface of described box cupling is divided into two symmetrical cross-talk inner surfaces by the mid-plane of box cupling, and described sub-inner surface comprises the internal thread segment, cylinder pipeline section, the first right angle torque resistant shoulder and the first cone seal section that are set gradually to middle part by the end of box cupling; The end outer surface of described body comprises the second cone seal section, the second right angle torque resistant shoulder and the external thread section that are set gradually to middle part by the end of body; Wherein, described internal thread segment and external thread section are the buttress thread of working in coordination; When described two bodys are connected respectively to the two ends of described box cupling, described first right angle torque resistant shoulder and described second right angle torque resistant shoulder are worked in coordination, form interference fit between described first cone seal section and described second cone seal section, the end face of described two bodys forms interference docking and coordinates at the mid-plane place of box cupling.
According to an embodiment of air sealed threaded sleeve joint of the present utility model, the intersection between described first right angle torque resistant shoulder and the first cone seal section, between described second right angle torque resistant shoulder and the second cone seal section all adopts arc-shaped transitional surface.
According to an embodiment of air sealed threaded sleeve joint of the present utility model, the intersection between described first right angle torque resistant shoulder and cylinder pipeline section, between described second cone seal section and the end face of body all adopts arc-shaped transitional surface.
According to an embodiment of air sealed threaded sleeve joint of the present utility model, the tapering of described internal thread segment and external thread section is API standard buttress thread tapering, and the threaded engagement magnitude of interference of internal thread segment and external thread section is 0.2 ~ 0.5mm.
According to an embodiment of air sealed threaded sleeve joint of the present utility model, the tapering of described first cone seal section and the second cone seal section is 1:10 ~ 1:8, the matching allowance of the first cone seal section and the second cone seal section is 0.3 ~ 0.6mm, and the length of the first cone seal section and the second cone seal section is 5 ~ 8mm.
According to an embodiment of air sealed threaded sleeve joint of the present utility model, the angle of the end face of described body and the axis of body is 90 °.
Air sealed threaded sleeve joint of the present utility model adopts the buttress thread meeting API standard, the circumference stress reducing nipple by optimizing thread tolerance scope, reduce joint stress corrosion opening cracking maleate sensitivity and improve the anti-stick button ability of joint; Right angle torque shoulder in box cupling and body serves again the effect of auxiliary seal while the anti-mistake of joint turns round ability increasing, adopt the structure of cone-shape metallic leak-proof to substantially increase the gas tightness of nipple; The end face of upper latter two body of button is formed centrally interference docking and coordinates in box cupling, and the anti-mistake further increasing joint is turned round, resistance to compression play the effect of auxiliary seal; In addition, inner nosepiece wall is level and smooth, eliminates the phenomenon of internal flow turbulent flow, improves the production efficiency of oil gas.
Accompanying drawing explanation
Fig. 1 is the fit structure sectional view of the air sealed threaded sleeve joint comprising common API standard buttress thread in prior art.
Fig. 2 is the structure sectional view of box cupling in air sealed threaded sleeve joint of the present utility model.
Fig. 3 is the part-structure sectional view of air sealed threaded sleeve joint middle tube body of the present utility model.
Fig. 4 is the fit structure sectional view of air sealed threaded sleeve joint of the present utility model.
Description of reference numerals:
1-box cupling, 2-body, 3-external thread section, 3 ＇-internal thread segment, 4-cylinder pipeline section, 5-second right angle torque resistant shoulder, 5 ＇-the first right angle torque resistant shoulders, 6-second cone seal section, 6 ＇-the first cone seal sections, the end face of 7-body, 8-box cupling mid-plane, the fitting face of 3-3 ＇-external thread section and internal thread segment, the fitting face of 5-5 ＇-the first right angle torque resistant shoulder and the second right angle torque resistant shoulder, the fitting face of 6-6 ＇-the second cone seal section and the first cone seal section, the fitting face of 7-7-two body end faces.
Detailed description of the invention
Hereinafter, be specifically described to the air sealed threaded sleeve joint of the utility model exemplary embodiment.
According to exemplary embodiment of the present utility model, described air sealed threaded sleeve joint comprises box cupling 1 and two bodys 2, and the two ends of box cupling 1 are threaded with two bodys 2 respectively, realizes the sealing of sleeve pipe connection and oil gas thus.The utility model mainly solves the problems such as joint sealing performance is unreliable, joint stress level is high, cause internal flow turbulent by improving box cupling 1 and the fit structure of body 2, and the improvement of box cupling 1, body 2 and fit structure is described as follows.
Fig. 2 is the structure sectional view of box cupling in air sealed threaded sleeve joint of the present utility model, and Fig. 3 is the part-structure sectional view of air sealed threaded sleeve joint middle tube body of the present utility model.As shown in Figure 2, the inner surface of box cupling 1 is divided into two symmetrical cross-talk inner surfaces by the mid-plane 8 of box cupling, and described sub-inner surface comprises internal thread segment 3 ＇, cylinder pipeline section 4, first right angle torque resistant shoulder 5 ＇ and the first cone seal section 6 ＇ that are set gradually to middle part by the end of box cupling 1.As shown in Figure 3, the end outer surface of body 2 comprises the second cone seal section 6, second right angle torque resistant shoulder 5 and the external thread section 3 set gradually to middle part by the end of body 2.Wherein, internal thread segment 3 ＇ and the buttress thread of external thread section 3 for working in coordination, internal thread segment 3 ＇ can coordinate with external thread section 3 and realizes being threaded between box cupling 1 with body 2 thus.
Fig. 4 is the fit structure sectional view of air sealed threaded sleeve joint of the present utility model.As shown in Figure 4, when two bodys 2 are connected respectively to the two ends of box cupling 1, internal thread segment 3 ＇ and external thread section 3 are worked in coordination and are formed the fitting face 3-3 ＇ of external thread section and internal thread segment; First right angle torque resistant shoulder 5 ＇ and the second right angle torque resistant shoulder 5 are worked in coordination the fitting face 5-5 ＇ of formation first right angle torque resistant shoulder and the second right angle torque resistant shoulder, and this cooperation is simultaneously played anti-mistake and turned round the effect with auxiliary seal; Form interference fit between first cone seal section 6 ＇ and the second cone seal section 6 and form the fitting face 6-6 ＇ of the second cone seal section and the first cone seal section, this cooperation simultaneously forms main seal structure; The end face 7 of two bodys forms interference docking and coordinates and form the fitting face 7-7 of two body end faces at mid-plane 8 place of box cupling 1, the effect of auxiliary seal is also played in this cooperation.Wherein, set right angle torque resistant shoulder fit structure plays again the effect of auxiliary seal while the anti-mistake of joint turns round ability increasing, the cone seal fit structure adopted can improve the gas tightness of joint greatly, and the interference docking that two body end faces are formed centrally in box cupling coordinates, and the anti-mistake that can improve joint is further turned round, resistance to compression play the effect of auxiliary seal, inner nosepiece wall after can making thus to connect is level and smooth, the phenomenon of effective elimination internal flow turbulent flow, and the production efficiency improving oil, gas.
According to an embodiment of the present utility model, intersection between first right angle torque resistant shoulder 5 ＇ and the first cone seal section 6 ＇, between the second right angle torque resistant shoulder 5 and the second cone seal section 6 all adopts arc-shaped transitional surface, adopt circular arc smoothly transit can reduce seal section and shoulder intersection stress concentrate and can effectively avoid joint to coordinate time damage.Further, the intersection between the first right angle torque resistant shoulder and cylinder pipeline section, between the second cone seal section and the end face of body all adopts arc-shaped transitional surface, can improve the importing performance of the second cone seal section during cooperation, improves the anti-stick button performance in joint sealing face.
According to exemplary embodiment of the present utility model, the tapering of internal thread segment 3 ＇ and external thread section 3 is API standard buttress thread tapering, the threaded engagement magnitude of interference of internal thread segment 3 ＇ and external thread section 3 is 0.2 ~ 0.5mm, in the art, API standard buttress thread tapering is the nominal ratio of a design, i.e. 1:16, has a positive and negative deviation area requirement usually in actual production; The tapering of the first cone seal section 6 ＇ and the second cone seal section 6 is 1:10 ~ 1:8, the matching allowance of the first cone seal section 6 ＇ and the second cone seal section 6 is 0.3 ~ 0.6mm, and the length of the first cone seal section 6 ＇ and the second cone seal section 6 is 5 ~ 8mm; The end face 7 of body is 90 ° with the angle of the axis of body, and the angle of the first right angle torque resistant shoulder 5 ＇ and the second right angle torque resistant shoulder 5 is 90 °.The utility model, by the optimization to the partially trapezoidal connecting thread fit tolerance of API standard, substantially reduces the magnitude of interference (being about 1/3 ~ 2/3 of API screw thread) during threaded engagement, improves the anti-stick button performance of joint, reduce the stress level of joint; The conical seal (contact) face increased coordinates and serves effective hermetic seal effect, be efficiently avoid the possibility of sealing surface generation thread gluing by the design of suitable sealing surface length and the magnitude of interference.
In sum, the utility model significantly improves the gas sealing ability of joint, and difficulty of processing is little, cost is low and reduce the circumference stress of joint; Simultaneously, right angle torque shoulder in box cupling and body serves again the effect of auxiliary seal while the anti-mistake of joint turns round ability increasing, the structure of cone-shape metallic leak-proof is adopted to substantially increase the gas tightness of nipple, the interior concordant design of box cupling middle tube body end face eliminates internal flow turbulent flow phenomenon, improves the production efficiency of oil gas.
Although describe air sealed threaded sleeve joint of the present utility model in conjunction with exemplary embodiment above, but those of ordinary skill in the art should be clear, when not departing from the spirit and scope of claim, various amendment can be carried out to above-described embodiment.
Claims (6)
1. an air sealed threaded sleeve joint, described nipple comprises box cupling and two bodys, and the two ends of described box cupling are threaded with described two bodys respectively, it is characterized in that,
The inner surface of described box cupling is divided into two symmetrical cross-talk inner surfaces by the mid-plane of box cupling, and described sub-inner surface comprises the internal thread segment, cylinder pipeline section, the first right angle torque resistant shoulder and the first cone seal section that are set gradually to middle part by the end of box cupling;
The end outer surface of described body comprises the second cone seal section, the second right angle torque resistant shoulder and the external thread section that are set gradually to middle part by the end of body;
Wherein, described internal thread segment and external thread section are the buttress thread of working in coordination; When described two bodys are connected respectively to the two ends of described box cupling, described first right angle torque resistant shoulder and described second right angle torque resistant shoulder are worked in coordination, form interference fit between described first cone seal section and described second cone seal section, the end face of described two bodys forms interference docking and coordinates at the mid-plane place of box cupling.
2. air sealed threaded sleeve joint according to claim 1, it is characterized in that, the intersection between described first right angle torque resistant shoulder and the first cone seal section, between described second right angle torque resistant shoulder and the second cone seal section all adopts arc-shaped transitional surface.
3. air sealed threaded sleeve joint according to claim 1, is characterized in that, the intersection between described first right angle torque resistant shoulder and cylinder pipeline section, between described second cone seal section and the end face of body all adopts arc-shaped transitional surface.
4. air sealed threaded sleeve joint according to claim 1, is characterized in that, the tapering of described internal thread segment and external thread section is API standard buttress thread tapering, and the threaded engagement magnitude of interference of internal thread segment and external thread section is 0.2 ~ 0.5mm.
5. air sealed threaded sleeve joint according to claim 1, it is characterized in that, the tapering of described first cone seal section and the second cone seal section is 1:10 ~ 1:8, the matching allowance of the first cone seal section and the second cone seal section is 0.3 ~ 0.6mm, and the length of the first cone seal section and the second cone seal section is 5 ~ 8mm.
6. air sealed threaded sleeve joint according to claim 1, is characterized in that, the angle of the end face of described body and the axis of body is 90 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420359589.XU CN204082030U (en) | 2014-07-01 | 2014-07-01 | A kind of air sealed threaded sleeve joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420359589.XU CN204082030U (en) | 2014-07-01 | 2014-07-01 | A kind of air sealed threaded sleeve joint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204082030U true CN204082030U (en) | 2015-01-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420359589.XU Expired - Fee Related CN204082030U (en) | 2014-07-01 | 2014-07-01 | A kind of air sealed threaded sleeve joint |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204082030U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112576205A (en) * | 2019-09-29 | 2021-03-30 | 宝山钢铁股份有限公司 | Special screwed joint of high-temperature well casing pipe |
-
2014
- 2014-07-01 CN CN201420359589.XU patent/CN204082030U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112576205A (en) * | 2019-09-29 | 2021-03-30 | 宝山钢铁股份有限公司 | Special screwed joint of high-temperature well casing pipe |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150107 Termination date: 20170701 |