CN202578553U - High-sealing-property special round-thread oil sleeve connecting joint - Google Patents
High-sealing-property special round-thread oil sleeve connecting joint Download PDFInfo
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- CN202578553U CN202578553U CN 201220181535 CN201220181535U CN202578553U CN 202578553 U CN202578553 U CN 202578553U CN 201220181535 CN201220181535 CN 201220181535 CN 201220181535 U CN201220181535 U CN 201220181535U CN 202578553 U CN202578553 U CN 202578553U
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Abstract
The utility model relates to a high-sealing-property special round-thread oil sleeve connecting joint which comprises a joint hoop and a pipe body connected via threads, and the tooth shape of the threads is special round thread with arc tooth tops and arc tooth bottoms; a middle cylindrical surface is arranged in the middle part of the inner wall of the joint hoop, and metal seal structures are respectively arranged between two end surfaces of the middle cylindrical surface and the end part of the pipe body; an inner sealing surface comprises an inner conical surface and a transition conical surface arranged between the end surface of the middle cylindrical surface and the end part of the inner thread of the joint hoop, the end surface of the middle cylindrical surface protrudes outwards to form an inner sealing included angle, and an inner sealing end arc surface is arranged between the inner sealing included angle and the inner conical surface; and an outer sealing surface comprises an outer conical surface arranged at the outer wall at the end part of the pipe body, and the end surface of the end part of the pipe body is indented inwards to form an outer sealing included angle. In the high-sealing-property special round-thread oil sleeve connecting joint, asymmetrical special round threads are adopted, the metal sealing structure combining the arc and the large-angle concave-convex structure is arranged, and thus, the joint has high strength, good sealing property and high torque resistance and bending resistance.
Description
Technical field
The utility model relates to the oil well pipe thread joint that is applied to petroleum industry, the special round thread tubing and casing of specifically a kind of high sealability jointing.
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 utility model provides the special round thread tubing and casing of a kind of high sealability jointing to the problems referred to above, and 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.
Technical scheme according to the utility model: the special round thread tubing and casing of a kind of high sealability jointing; 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 comprises the internal conical surface and the transition conical surface that is arranged between said middle cylinder end face and the said box cupling internal threaded end; The end face of cylinder sealing angle in the outside protrusion forms in the middle of said, sealed end cambered surface in being provided with between said interior sealing angle and the said internal conical surface; Said external seal face comprises the outer conical surface that is arranged on the outer wall of said body end, and the end face of said body end inwardly concaves and forms the external seal angle, is provided with external seal end cambered surface between said external seal angle and the said outer conical surface.
The value of sealing angle is 110 ° ~ 130 ° in said, and said external seal angle is littler 0 ~ 2 ° than the value of sealing angle in said; The acute angle that forms between sealing angle and the said middle cylinder in said is inner sealing surface end angle; Said inner sealing surface end angle is 65 ° ~ 85 °; The acute angle that forms between the internal face of said external seal angle and said body is external seal face end angle, and said external seal face end angle is littler 0 ~ 2 ° than said inner sealing surface end angle.
The tapering of said internal conical surface is identical with the tapering of said screw thread, and the tapering of the said transition conical surface is greater than the tapering of said screw thread; The tapering of said outer conical surface is identical with the tapering of said screw thread, and the surface of said outer conical surface is lower than element of cone at the bottom of the tooth of said screw thread.
The radius of sealed end cambered surface is 0.5 ~ 2.0mm in said, and the radius of said external seal end cambered surface is identical with the radius of said interior sealed end cambered surface.
Sealed end transition arc in being provided with between sealed end cambered surface and the said interior sealing angle in said, the radius of said interior sealed end transition arc is 0.1 ~ 0.5mm; Be provided with external seal end transition arc between said external seal end cambered surface and the said external seal angle, the radius of said external seal end transition arc is identical with the radius of said interior sealed end transition arc.
Seal angle was spent and is crossed circular arc in the place, summit of sealing angle was provided with in said, and it is 0.3 ~ 0.8mm that said interior seal angle is spent the radius that crosses circular arc; The place, summit of said external seal angle is provided with external seal angle transition arc, and the radius of said external seal angle transition arc is spent the radius 0.2 ~ 0.3mm that crosses circular arc less than seal angle in said.
The outer conical surface length of said external seal face is 8 ~ 20mm, and the length of said inner sealing surface is than the long half pitch of length of said outer conical surface, and the length of said internal conical surface is 5 ~ 10mm, and the length of the said transition conical surface is 3 ~ 10mm.
The thickness of said inner sealing surface is 3 ~ 10mm, and the thickness of said external seal face equates with the thickness of said inner sealing 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.
The technique effect of the utility model is: the utility model 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 circular arc and the shape metallic leak-proof structure that the wide-angle convex-concave structure combines, made it after interference fit, can effectively improve torque resistant performance and sealing performance.
Description of drawings
Fig. 1 is the structural representation of the utility model.
Fig. 2 is the structural representation of the utility model after decomposing.
Fig. 3 is the form of thread figure in the utility model.
Fig. 4 is the enlarged drawing of the inner sealing surface in the utility model.
Fig. 5 is the enlarged drawing of the external seal face in the utility model.
The specific embodiment
Be further described below in conjunction with the specific embodiment of accompanying drawing the utility model.
Among Fig. 1 ~ Fig. 5, comprise that 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, inner sealing surface 13, external seal face 14, middle cylinder 15, outer conical surface 16, internal conical surface 17, external seal end cambered surface 18, interior sealed end cambered surface 19, external seal end transition arc 20, interior sealed end transition arc 21, external seal angle transition arc 22, interior seal angle spend and cross circular arc 23, external seal face end angle 24, inner sealing surface end angle 25, external seal angle 26, interior sealing angle 27, external seal face thickness 28, inner sealing surface thickness 29, the interior sealing transition conical surface 30, inner sealing surface length 31, middle line 32 etc.
Like Fig. 1, shown in Figure 2, the utility model is the special round thread tubing and casing of an a kind of high sealability jointing, comprises the box cupling 1 and the body 2,3 that connect through screw thread 4.Box cupling 1 and body the 2, the 3rd be that benchmark closely cooperates with virtual middle line 32, 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 in the utility model 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 15 of ring-type at the axial middle part of box cupling 1 inwall again, the length range of middle cylinder 15 is 50 ~ 200mm, increases the bonding strength and the counter-bending ability of joint.Be respectively arranged with shape metallic leak-proof structure between the both ends of the surface of middle cylinder 15 and the end of body 2,3.Shape metallic leak-proof structure comprises the inner sealing surface 13 that is arranged on the box cupling 1 and is arranged on the external seal face 14 on the body 2,3.
As shown in Figure 4; Inner sealing surface 13 comprises the internal conical surface 17 and the transition conical surface 30 that is arranged between middle cylinder 15 end faces and box cupling 1 internal threaded end; The end face of middle cylinder 15 is sealing angle 27 in the outside protrusion forms, sealed end cambered surface 19 in being provided with between interior sealing angle 27 and the internal conical surface 17.
The thickness 29 of inner sealing surface 13 is 3 ~ 10mm, and the length 31 of inner sealing surface 13 is than the long half pitch 11 of length of outer conical surface 16, and wherein, the length of internal conical surface 17 is 5 ~ 10mm, and the length of the transition conical surface 30 is 3 ~ 10mm.The tapering of internal conical surface 17 is identical with the tapering of screw thread 4, and the tapering of the transition conical surface 30 is greater than the tapering of screw thread 4, seamlessly transits simultaneously externally to reach it that sealing surface 14 plays guide effect.The radius of interior sealed end cambered surface 19 is 0.5 ~ 2.0mm, sealed end transition arc 21 in being provided with between interior sealed end cambered surface 19 and the interior sealing angle 27, and the radius of interior sealed end transition arc 21 is 0.1 ~ 0.5mm.The value of interior sealing angle 27 is 110 ° ~ 130 °; The acute angle that forms between interior sealing angle 27 and the middle cylinder 15 is inner sealing surface end angle 25, and inner sealing surface end angle 25 is 65 ° ~ 85 °.Seal angle was spent and is crossed circular arc 23 in the place, summit of interior sealing angle 27 was provided with, and it is 0.3 ~ 0.8mm that interior seal angle is spent the radius that crosses circular arc 23.
As shown in Figure 5, external seal face 14 comprises the outer conical surface 16 that is arranged on body 2, the 3 end outer walls, and the end face of body 2,3 ends inwardly concaves and forms external seal angle 26, is provided with external seal end cambered surface 18 between external seal angle 26 and the outer conical surface 16.
The thickness 15 of external seal face 14 equates with the thickness 16 of inner sealing surface 13, and is concordant with the inwall of body 2,3 with the middle cylinder 15 that reaches box cupling 1, remains on same plane, reduces the current resistance of fluid in body.Outer conical surface 16 length of external seal face 14 are 8 ~ 20mm.The tapering of outer conical surface 16 is identical with the tapering of screw thread 4, and the surface of outer conical surface 16 is lower than element of cone at the bottom of the tooth of screw thread 4, so just can not cause its surface touching internal thread tooth top.The radius of external seal end cambered surface 18 is identical with the radius of interior sealed end cambered surface 19; Be provided with external seal end transition arc 20 between external seal end cambered surface 18 and the external seal angle 26, the radius of external seal end transition arc 20 is identical with the radius of interior sealed end transition arc 21.
During the utility model operation; Any end with box cupling 1 is inserted in earlier on the body 2 earlier; Overlap and fashionablely should the external screw thread of the internal thread of box cupling 1 and body 2 be inserted in 3 ~ 7 buttons earlier; Because spigot surface tooth side angle 6 gradients are bigger, be lowered to button in action of gravity during hitch 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.Manpower screws in then, screw when motionless with manpower till, hand-tight box cupling that spins together 1 and body 2 usefulness petroleum pipeline screw-on machine devices are carried out further machine twist the interference fit state that connects when reaching that machine is stubborn to be connect.Because of box cupling 1 has inner sealing surface 13; Twist when machine and to have bigger torque resistant performance and high sealing performance after taking over that being full of screws and cooperating; Position that machine is tight and torque can be made separate stipulations according to API standard operation or technical papers, after machine tightly screws, any gap must not be arranged with external seal face 14 but must satisfy inner sealing surface 13.Same fastening method; Is that benchmark closely cooperate with body 3 with virtual middle line 32 with its 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 utility model 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 circular arc and the shape metallic leak-proof structure that the wide-angle convex-concave structure combines, made it after interference fit, can effectively improve torque resistant performance and sealing performance; Increase the overall length of box cupling, improved the counter-bending ability of joint.
The utility model processing is 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. the special round thread tubing and casing of high sealability jointing; 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 (15) of ring-type; Be respectively arranged with shape metallic leak-proof structure between the end of the both ends of the surface of cylinder (15) and said body (2,3) in the middle of said, said shape metallic leak-proof structure comprises the inner sealing surface (13) that is arranged on the said box cupling (1) and is arranged on the external seal face (14) on the said body (2,3); Said inner sealing surface (13) comprises the internal conical surface (17) and the transition conical surface (30) that is arranged between said middle cylinder (15) end face and said box cupling (1) internal threaded end; The end face of cylinder (15) sealing angle (27) in the outside protrusion forms in the middle of said, sealed end cambered surface (19) in being provided with between said interior sealing angle (27) and the said internal conical surface (17); Said external seal face (14) comprises the outer conical surface (16) that is arranged on said body (2,3) the end outer wall; The end face of said body (2,3) end inwardly concaves and forms external seal angle (26), is provided with external seal end cambered surface (18) between said external seal angle (26) and the said outer conical surface (16).
2. according to the special round thread tubing and casing of the described high sealability of claim 1 jointing, it is characterized in that: the value of sealing angle (27) is 110 ° ~ 130 ° in said, and said external seal angle (26) is littler 0 ~ 2 ° than the value of sealing angle (27) in said; The acute angle that forms between sealing angle (27) and the said middle cylinder (15) in said is inner sealing surface end angle (25); Said inner sealing surface end angle (25) is 65 ° ~ 85 °; The acute angle that forms between the internal face of said external seal angle (26) and said body (2,3) is external seal face end angle (24), and said external seal face end angle (24) is littler 0 ~ 2 ° than said inner sealing surface end angle (25).
3. according to the special round thread tubing and casing of the described high sealability of claim 1 jointing; It is characterized in that: the tapering of said internal conical surface (17) is identical with the tapering of said screw thread (4), and the tapering of the said transition conical surface (30) is greater than the tapering of said screw thread (4); The tapering of said outer conical surface (16) is identical with the tapering of said screw thread (4), and the surface of said outer conical surface (16) is lower than element of cone at the bottom of the tooth of said screw thread (4).
4. according to the special round thread tubing and casing of the described high sealability of claim 1 jointing; It is characterized in that: the radius of sealed end cambered surface (19) is 0.5 ~ 2.0mm in said, and the radius of said external seal end cambered surface (18) is identical with the radius of said interior sealed end cambered surface (19).
5. according to the special round thread tubing and casing of the described high sealability of claim 1 jointing; It is characterized in that: sealed end transition arc (21) in being provided with between sealed end cambered surface (19) and the said interior sealing angle (27) in said, the radius of said interior sealed end transition arc (21) is 0.1 ~ 0.5mm; Be provided with external seal end transition arc (20) between said external seal end cambered surface (18) and the said external seal angle (26), the radius of said external seal end transition arc (20) is identical with the radius of said interior sealed end transition arc (21).
6. according to the special round thread tubing and casing of the described high sealability of claim 1 jointing; It is characterized in that: seal angle was spent and is crossed circular arc (23) in place, the summit of sealing angle (27) was provided with in said, and it is 0.3 ~ 0.8mm that said interior seal angle is spent the radius that crosses circular arc (23); The place, summit of said external seal angle (26) is provided with external seal angle transition arc (22), and the radius of said external seal angle transition arc (22) is spent the radius 0.2 ~ 0.3mm that crosses circular arc (23) less than seal angle in said.
7. according to the special round thread tubing and casing of the described high sealability of claim 1 jointing; It is characterized in that: outer conical surface (16) length of said external seal face (14) is 8 ~ 20mm; The length (31) of said inner sealing surface (13) is than the long half pitch (11) of length of said outer conical surface (16); The length of said internal conical surface (17) is 5 ~ 10mm, and the length of the said transition conical surface (30) is 3 ~ 10mm.
8. according to the special round thread tubing and casing of the described high sealability of claim 1 jointing; It is characterized in that: the thickness (29) of said inner sealing surface (13) is 3 ~ 10mm, and the thickness (15) of said external seal face (14) equates with the thickness (16) of said inner sealing surface (13).
9. according to the special round thread tubing and casing of the described high sealability of claim 1 jointing, 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 special round thread tubing and casing of 9 described high sealabilitys jointing, 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 |
|---|---|---|---|
| CN 201220181535 CN202578553U (en) | 2012-04-25 | 2012-04-25 | High-sealing-property special round-thread oil sleeve connecting joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220181535 CN202578553U (en) | 2012-04-25 | 2012-04-25 | High-sealing-property special round-thread oil sleeve connecting joint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202578553U true CN202578553U (en) | 2012-12-05 |
Family
ID=47247974
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220181535 Expired - Fee Related CN202578553U (en) | 2012-04-25 | 2012-04-25 | High-sealing-property special round-thread oil sleeve connecting joint |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202578553U (en) |
-
2012
- 2012-04-25 CN CN 201220181535 patent/CN202578553U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| PP01 | Preservation of patent right |
Effective date of registration: 20140922 Granted publication date: 20121205 |
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| RINS | Preservation of patent right or utility model and its discharge | ||
| PD01 | Discharge of preservation of patent |
Date of cancellation: 20150322 Granted publication date: 20121205 |
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| RINS | Preservation of patent right or utility model and its discharge | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121205 Termination date: 20180425 |
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| CF01 | Termination of patent right due to non-payment of annual fee |