CN102587842A - Special round thread highly-torque-resistant pipe coupling - Google Patents
Special round thread highly-torque-resistant pipe coupling Download PDFInfo
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- CN102587842A CN102587842A CN2012100837977A CN201210083797A CN102587842A CN 102587842 A CN102587842 A CN 102587842A CN 2012100837977 A CN2012100837977 A CN 2012100837977A CN 201210083797 A CN201210083797 A CN 201210083797A CN 102587842 A CN102587842 A CN 102587842A
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Abstract
The invention relates to a special round thread highly-torque-resistant pipe coupling, which comprises a hoop and a pipe which are in threaded connection. The form of the thread belongs to a special round thread with an arc-shaped tooth crest and an arc-shaped tooth bottom, and the flank angle of a guiding face of the thread is different from that of a bearing face. A middle cylindrical surface is arranged in the middle of the inner wall of the hoop, and metal sealing structures are arranged between the two end surfaces of the middle cylindrical surface and the ends of the pipe respectively. Each metal sealing structure comprises an inner sealing face and an outer sealing face. The inner sealing face includes an inner sealing arc-shaped face arranged between the end face of the middle cylindrical surface and the end of an internal thread of the hoop, and an inner sealing end arc-shaped face which is perpendicular to the inner sealing arc-shaped face. The outer sealing face includes an outer sealing arc-shaped face arranged on the outer wall of the end of the pipe and an outer sealing end arc-shaped face which is perpendicular to the outer sealing arc-shaped face. The special round thread highly-torque-resistant pipe coupling is provided with the dissymmetrical special round thread, is provided with the double arc type metal sealing structures, and is high in intensity, fine in sealing performance, and high in torque resistance and bending resistance.
Description
Technical field
The present invention relates to be applied to the oil well pipe thread joint of petroleum industry, the high torque resistant union of specifically a kind of special round thread.
Background technology
Tubing and casing in the oil well pipe industry mainly is to couple together through nipple, forms oil casing, and length reaches thousands of rice, the requirement of strength, the sealing performance that connect of nipple wherein, the having relatively high expectations of each side such as tensile load and torque resistant performance.
At present, the structure that existing tubing and casing round thread connects all is API (American Petroleum Institute (API)) standard round screw thread basically, technological comparative maturity, but result of use is not ideal enough.The sealing surface poor performance of this standard round nipple a little less than the counter-bending ability, often causes revealing at screw connection point, quality accident such as fracture, slippage.
Summary of the invention
The present invention is directed to the problems referred to above, provide a kind of special round thread high torque resistant union, this joint bonding strength is high, good seal performance, and counter-bending ability is strong, and it is good to go into to detain performance.
According to technical scheme of the present invention: the high torque resistant union of a kind of special round thread; Comprise box cupling and body through being threaded; The tooth form of said screw thread is the special round thread that has at the bottom of circular arc tooth top and the circle-arc tooth; Its spigot surface tooth side angle is 40 ° ~ 50 °, and its bearing surface tooth side angle is 1 ° ~ 5 °, and its tapering is 1:8 ~ 1:20; The axial middle part of said box cupling inwall is provided with the middle cylinder of ring-type; Be respectively arranged with shape metallic leak-proof structure between the end of both ends of the surface and the said body of cylinder in the middle of said, said shape metallic leak-proof structure comprises and is arranged on the inner sealing surface on the said box cupling and is arranged on the external seal face on the said body; Said inner sealing surface comprise be arranged on said in the middle of between cylinder end face and the said box cupling internal threaded end interior sealing cambered surface and with the said interior vertical interior sealed end cambered surface of cambered surface that seals; Said external seal face comprises external seal cambered surface and the external seal end cambered surface vertical with said external seal cambered surface that is arranged on the outer wall of said body end.
The sealing cambered surface is convex globoidal or cancave cambered surface in said, and said external seal cambered surface is and opposite cancave cambered surface or the convex globoidal of said interior sealing cambered surface cambered surface; The sealed end cambered surface is a convex globoidal in said, and said external seal end cambered surface is a cancave cambered surface.
The sealing cambered surface is a cancave cambered surface in said; When said external seal cambered surface is convex globoidal; Be provided with transition arc between sealing cambered surface and said external seal cambered surface and the flute profile transition face in said, the transition arc of said external seal cambered surface is 3 ~ 6mm, the big 0 ~ 2mm of transition arc of said interior sealing cambered surface.
Be provided with the inner sealing surface fillet between sealed end cambered surface and the said interior sealing cambered surface in said; Be provided with external seal face bull nose between said external seal end cambered surface and the said external seal cambered surface.
The radius of said inner sealing surface fillet is 0.2 ~ 0.5mm, the big 0 ~ 1mm of radius of the said inner sealing surface fillet of radius ratio of said external seal face bull nose.
Be provided with the inner sealing surface bull nose between the inwall of sealed end cambered surface and said middle cylinder in said, said inner sealing surface bull nose is 0.2 ~ 0.5mm.
The length of sealing cambered surface is 10 ~ 20mm in said, and cambered surface radius is 40 ~ 60mm, and the length of said external seal cambered surface and cambered surface radius are identical with said interior sealing cambered surface.
The thickness of sealed end cambered surface is 5 ~ 15mm in said, and cambered surface radius is 4 ~ 10mm, and the thickness of said external seal end cambered surface and cambered surface radius are identical with said interior sealed end cambered surface.
The pitch of said screw thread is 6.5 tooth/inches ~ 4 tooth/inches, and its tooth form tooth depth is 1.5 ~ 2. 5mm.
The radius of circular arc and tooth top circular arc is 0.20 ~ 1.0mm at the bottom of the tooth of said screw thread.
Technique effect of the present invention is: the present invention adopts asymmetrical special round thread, and the spigot surface tooth side angle of tooth form is bigger than standard round screw thread, screw thread to go into to detain performance good, when machine is tight, be difficult for thread alternating; The bearing surface tooth side angle of tooth form forms barb, has improved the bonding strength of screw thread, has increased the tooth form sealing performance, has improved the counter-bending ability of joint simultaneously, and its anti-leakage performance is increased greatly; Between box cupling and body, increase two circular arc type shape metallic leak-proof structures, can effectively improve torque resistant performance and sealing performance.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is the structural representation of the present invention after decomposing.
Fig. 3 is the form of thread figure among the present invention.
Fig. 4 is the enlarged drawing of the inner sealing surface among the present invention.
Fig. 5 is the enlarged drawing of the external seal face among the present invention.
The specific embodiment
Be further described below in conjunction with the accompanying drawing specific embodiments of the invention.
Among Fig. 1 ~ Fig. 5, comprise circular arc 8 at the bottom of box cupling 1, body 2, body 3, screw thread 4, tooth form tooth depth 5, spigot surface tooth side angle 6, bearing surface tooth side angle 7, the tooth, tooth top circular arc 9, tapering 10, pitch 11, tooth form angle 12, external seal cambered surface 13, interior sealing cambered surface 14, external seal end cambered surface 15, interior sealed end cambered surface 16, external seal face bull nose 17, inner sealing surface fillet 18, inner sealing surface bull nose 19, inner sealing surface 20, external seal face 21, middle cylinder 22, middle line 23 etc.
Like Fig. 1, shown in Figure 2, the present invention is the high torque resistant union of a kind of special round thread, comprises the box cupling 1 and the body 2,3 that connect through screw thread 4.Box cupling 1 and body 2 are be that benchmark closely cooperates with virtual middle line 23, reach body 2 and body 3 through box cupling 1 carry out somely being connected to form oil, casing string satisfies oil gas field production instructions for use.
The tooth form of the screw thread 4 among the present invention is the special round thread that has at the bottom of circular arc tooth top and the circle-arc tooth, is changed into the asymmetric tooth form of deflection bearing surface by the tooth form of symmetry.As shown in Figure 3, the spigot surface tooth side angle 6 of screw thread 4 is 40 ° ~ 50 °, and its bearing surface tooth side angle 7 is 1 ° ~ 5 °, and the scope at tooth form angle 12 is the poor of spigot surface tooth side angle 6 and bearing surface tooth side angle 7.
The tapering 10 of screw thread 4 is 1:8 ~ 1:20; Pitch 11 is 6.5 tooth/inches ~ 4 tooth/inches (25.4 mm); Tooth form tooth depth 5 is 1.5 ~ 2.5mm.
The radius of circular arc 8 and tooth top circular arc 9 is 0.20 ~ 1.0mm at the bottom of the tooth of screw thread 4.
Referring to Fig. 1 and Fig. 2, be provided with the middle cylinder 22 of ring-type at the axial middle part of box cupling 1 inwall again, the length range of middle cylinder 22 is 50 ~ 200mm.Be respectively arranged with shape metallic leak-proof structure between the both ends of the surface of middle cylinder 22 and the end of body 2,3.Shape metallic leak-proof structure comprises the inner sealing surface 20 that is arranged on the box cupling 1 and is arranged on the external seal face 21 on the body 2,3.
As shown in Figure 4, inner sealing surface 20 comprise be arranged in the middle of cylinder 22 end faces and interior sealing cambered surface 14 between box cupling 1 internal threaded end reach the interior sealed end cambered surface 16 vertical with interior sealing cambered surface 14.Interior sealed end cambered surface 16 is a convex globoidal, and interior sealing cambered surface 14 is convex globoidal or cancave cambered surface.Be provided with inner sealing surface fillet 18 between interior sealed end cambered surface 16 and the interior sealing cambered surface 14, the radius of inner sealing surface fillet 18 is 0.2 ~ 0.5mm; Be provided with inner sealing surface bull nose 20 between the inwall of interior sealed end cambered surface 16 and middle cylinder 22, inner sealing surface bull nose 20 is 0.2 ~ 0.5mm.The length of interior sealing cambered surface 14 is 10 ~ 20mm, and cambered surface radius is 40 ~ 60mm; The thickness of interior sealed end cambered surface 16 is 5 ~ 15mm, and cambered surface radius is 4 ~ 10mm.
As shown in Figure 5, external seal face 21 comprises the external seal cambered surface that is arranged on body 2, the 3 end outer walls 13 and the external seal end cambered surface 15 vertical with external seal cambered surface 13.External seal end cambered surface 15 is the cancave cambered surface that matches with interior sealed end cambered surface 16, and external seal cambered surface 13 is and opposite cancave cambered surface or the convex globoidal of interior sealing cambered surface 14 cambered surfaces.Be provided with external seal face bull nose 17 between external seal end cambered surface 15 and the external seal cambered surface 13, the big 0 ~ 1mm of radius of the radius ratio inner sealing surface fillet 18 of external seal face bull nose 17.The length of external seal cambered surface 13 and cambered surface radius are identical with interior sealing cambered surface 14, and the thickness of external seal end cambered surface 15 and cambered surface radius are identical with interior sealed end cambered surface 16.
When interior sealing cambered surface 14 is a cancave cambered surface; When external seal cambered surface 13 is convex globoidal; Be provided with transition arc between interior sealing cambered surface 14 and external seal cambered surface 13 and the flute profile transition face; The transition arc of external seal cambered surface 13 is 3 ~ 6mm, the big 0 ~ 2mm of the transition arc of interior sealing cambered surface 14 so that the inner and outer sealing face screw when cooperating can be smoothly through and do not interfere.
When the present invention operates, earlier the external screw thread of body 2 is put into earlier and carried out machine behind internal thread 3 ~ 7 buttons of box cupling 1 and twist and connect.Because spigot surface tooth side angle 6 gradients are bigger, be lowered to button in action of gravity when putting button and be very easy to, can not cause internal thread tooth top and external screw thread tooth top top button, cause the tight phenomenon of thread alternating machine.Box cupling 1 has inner sealing surface 20; Twist when machine and to have bigger torque resistant effect after taking over that being full of screws and cooperating; The tight position of machine and torque can be made separate stipulations according to the tight identical or technical papers of deduction on the API standard round screw thread, but must satisfy closely cooperating of inner sealing surface 20 and external seal face 21 and internal and external threads 4.Same fastening method; Is that benchmark closely cooperate with body 3 with virtual middle line 23 with box cupling 1; Reach body 2 and body 3 through box cupling 1 carry out somely being connected to form oil, casing string satisfies oil gas field production instructions for use, when going into the well in the oil field its connector machine stressed joint is one by one formed thousands of meters oil casing.
The present invention adopts asymmetrical special round thread, and the spigot surface tooth side angle of tooth form is bigger than standard round screw thread, screw thread to go into to detain performance good, when machine is tight, be difficult for thread alternating; The bearing surface tooth side angle of tooth form forms barb, has improved the bonding strength of screw thread, has increased the tooth form sealing performance, has improved the counter-bending ability of joint simultaneously, and its anti-leakage performance is increased greatly; Between box cupling and body, increased a shape metallic leak-proof structure, made it after interference fit, can effectively improve torque resistant performance and sealing performance; Shape metallic leak-proof structure adopts two circular arc type hermetically-sealed constructions of end face and side, after interference fit, can effectively improve torque resistant performance and sealing performance, and processing is simple; Increase the overall length of box cupling, improved the counter-bending ability of joint.
The present invention processes simple and convenient, and the scope of application is wide, and is safe and reliable; Can bear the complicated power of extraneous high strength and apply and do not reveal or damage, satisfy the instructions for use in oil field.
Claims (10)
1. high torque resistant union of special round thread; Comprise the box cupling (1) and the body (2,3) that connect through screw thread (4); It is characterized in that: the tooth form of said screw thread (4) is the special round thread that has at the bottom of circular arc tooth top and the circle-arc tooth; Its spigot surface tooth side angle (6) is 40 ° ~ 50 °, and its bearing surface tooth side angle (7) is 1 ° ~ 5 °, and its tapering (10) is 1:8 ~ 1:20; The axial middle part of said box cupling (1) inwall is provided with the middle cylinder (22) of ring-type; Be respectively arranged with shape metallic leak-proof structure between the end of the both ends of the surface of cylinder (22) and said body (2,3) in the middle of said, said shape metallic leak-proof structure comprises the inner sealing surface (20) that is arranged on the said box cupling (1) and is arranged on the external seal face (21) on the said body (2,3); Said inner sealing surface (20) comprise be arranged on said in the middle of between cylinder (22) end face and said box cupling (1) internal threaded end interior sealing cambered surface (14) and with the said interior vertical interior sealed end cambered surface (16) of cambered surface (14) that seals; Said external seal face (21) comprises external seal cambered surface (13) and the external seal end cambered surface (15) vertical with said external seal cambered surface (13) that is arranged on said body (2,3) the end outer wall.
2. according to the high torque resistant union of the described special round thread of claim 1; It is characterized in that: sealing cambered surface (14) is convex globoidal or cancave cambered surface in said, and said external seal cambered surface (13) is and opposite cancave cambered surface or the convex globoidal of said interior sealing cambered surface (14) cambered surface; Sealed end cambered surface (16) is a convex globoidal in said, and said external seal end cambered surface (15) is a cancave cambered surface.
3. according to the high torque resistant union of the described special round thread of claim 2; It is characterized in that: sealing cambered surface (14) is cancave cambered surface in said; When said external seal cambered surface (13) is convex globoidal; Be provided with transition arc between sealing cambered surface (14) and said external seal cambered surface (13) and the flute profile transition face in said, the transition arc of said external seal cambered surface (13) is 3 ~ 6mm, the big 0 ~ 2mm of transition arc of said interior sealing cambered surface (14).
4. according to the high torque resistant union of the described special round thread of claim 1, it is characterized in that: be provided with inner sealing surface fillet (18) between sealed end cambered surface (16) and the said interior sealing cambered surface (14) in said; Be provided with external seal face bull nose (17) between said external seal end cambered surface (15) and the said external seal cambered surface (13).
5. according to the high torque resistant union of the described special round thread of claim 4; It is characterized in that: the radius of said inner sealing surface fillet (18) is 0.2 ~ 0.5mm, the big 0 ~ 1mm of radius of the said inner sealing surface fillet of the radius ratio of said external seal face bull nose (17) (18).
6. according to the high torque resistant union of the described special round thread of claim 1; It is characterized in that: be provided with inner sealing surface bull nose (20) between the inwall of sealed end cambered surface (16) and said middle cylinder (22) in said, said inner sealing surface bull nose (20) is 0.2 ~ 0.5mm.
7. according to the high torque resistant union of the described special round thread of claim 1; It is characterized in that: the length of sealing cambered surface (14) is 10 ~ 20mm in said; Cambered surface radius is 40 ~ 60mm, and the length of said external seal cambered surface (13) and cambered surface radius are identical with said interior sealing cambered surface (14).
8. according to the high torque resistant union of the described special round thread of claim 1; It is characterized in that: the thickness of sealed end cambered surface (16) is 5 ~ 15mm in said; Cambered surface radius is 4 ~ 10mm, and the thickness of said external seal end cambered surface (15) and cambered surface radius are identical with said interior sealed end cambered surface (16).
9. according to the high torque resistant union of the described special round thread of claim 1, it is characterized in that: the pitch (11) of said screw thread (4) is 6.5 tooth/inches ~ 4 tooth/inches, and its tooth form tooth depth (5) is 1.5 ~ 2. 5mm.
10. according to claim 1 or the high torque resistant union of 9 described special round threads, it is characterized in that: the radius of circular arc (8) and tooth top circular arc (9) is 0.20 ~ 1.0mm at the bottom of the tooth of said screw thread (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100837977A CN102587842A (en) | 2012-03-27 | 2012-03-27 | Special round thread highly-torque-resistant pipe coupling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100837977A CN102587842A (en) | 2012-03-27 | 2012-03-27 | Special round thread highly-torque-resistant pipe coupling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102587842A true CN102587842A (en) | 2012-07-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012100837977A Pending CN102587842A (en) | 2012-03-27 | 2012-03-27 | Special round thread highly-torque-resistant pipe coupling |
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| Country | Link |
|---|---|
| CN (1) | CN102587842A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103075114A (en) * | 2013-01-17 | 2013-05-01 | 中国石油天然气集团公司 | Coupling |
| CN110678623A (en) * | 2018-03-26 | 2020-01-10 | 中国石油天然气集团有限公司 | Method for determining manufacturing parameters of sealing structure of oil well pipe joint and sealing method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2893759A (en) * | 1957-05-06 | 1959-07-07 | Smith Corp A O | Conically tapered screw-type casing joint with metal-to-metal seal |
| CN2732980Y (en) * | 2004-08-18 | 2005-10-12 | 天津钢管有限责任公司 | Sawtooth casing threaded connection structure |
| CN201496000U (en) * | 2009-08-20 | 2010-06-02 | 四川华工石油钢管有限责任公司 | Structure of hermetically sealed joint of oil pipe or sleeve |
| CN202578545U (en) * | 2012-03-27 | 2012-12-05 | 无锡西姆莱斯石油专用管制造有限公司 | High-resistance torque tube joint with special knuckle threads |
-
2012
- 2012-03-27 CN CN2012100837977A patent/CN102587842A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2893759A (en) * | 1957-05-06 | 1959-07-07 | Smith Corp A O | Conically tapered screw-type casing joint with metal-to-metal seal |
| CN2732980Y (en) * | 2004-08-18 | 2005-10-12 | 天津钢管有限责任公司 | Sawtooth casing threaded connection structure |
| CN201496000U (en) * | 2009-08-20 | 2010-06-02 | 四川华工石油钢管有限责任公司 | Structure of hermetically sealed joint of oil pipe or sleeve |
| CN202578545U (en) * | 2012-03-27 | 2012-12-05 | 无锡西姆莱斯石油专用管制造有限公司 | High-resistance torque tube joint with special knuckle threads |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103075114A (en) * | 2013-01-17 | 2013-05-01 | 中国石油天然气集团公司 | Coupling |
| CN103075114B (en) * | 2013-01-17 | 2016-03-09 | 中国石油天然气集团公司 | A kind of box cupling |
| CN110678623A (en) * | 2018-03-26 | 2020-01-10 | 中国石油天然气集团有限公司 | Method for determining manufacturing parameters of sealing structure of oil well pipe joint and sealing method |
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Application publication date: 20120718 |