CN102606086A - Connecting joint with special knuckle threads for oil casing - Google Patents
Connecting joint with special knuckle threads for oil casing Download PDFInfo
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- CN102606086A CN102606086A CN2012100837996A CN201210083799A CN102606086A CN 102606086 A CN102606086 A CN 102606086A CN 2012100837996 A CN2012100837996 A CN 2012100837996A CN 201210083799 A CN201210083799 A CN 201210083799A CN 102606086 A CN102606086 A CN 102606086A
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Abstract
The invention relates to a connecting joint with special knuckle threads for an oil casing, which comprises a coupling and a tube. The coupling and the tube are connected in a threaded manner, the special knuckle threads have arc tooth tops and arc tooth bottoms, and the thread side angle of a guiding surface of the special threads is different from that of a bearing surface; a middle cylindrical surface is arranged in the middle of the inner wall of the coupling, a metal sealing structure is arranged between each of two end surfaces of the middle cylindrical surface and an end of a tube, and each metal sealing structure comprises an inner sealing surface and an outer sealing surface; each inner sealing surface comprises an inner conical surface and a transitional conical surface, each inner conical surface is arranged between a corresponding end surface of the middle cylindrical surface and a corresponding inner threaded end of the coupling, and each end surface of the middle cylindrical surface is inclined outwards to form an inner end surface chamfer; and each outer sealing surface comprises an outer conical surface arranged on the outer wall of the corresponding end of the tube, and the end surface of the end of the tube is inclined inwards to form an outer end surface chamfer. The connecting joint comprises the asymmetrical special knuckle threads, is provided with the metal sealing structures, and is high in strength, sealing performance, anti-torsion performance and anti-bending capacity.
Description
Technical field
The present invention relates to be applied to the oil well pipe thread joint of petroleum industry, specifically a kind of special round thread tubing and casing 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 present invention is directed to the problems referred to above, a kind of special round thread tubing and casing jointing is provided, 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: a kind of special round thread tubing and casing 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, and the end face of said middle cylinder is formed slopely the inner face chamfering to the outside; 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 slopes inwardly and forms the outer face chamfering.
The value of said inner face chamfering is 10 ° ~ 45 °, and said outer face chamfering is littler 0 ~ 3 ° than the value of said inner face chamfering.
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 provided with the inner face circular arc greater than the tapering of said screw thread between the end face of said middle cylinder and the said internal conical surface; 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, is provided with the outer face circular arc between said outer face chamfering and the said outer conical surface.
The radius of said inner face circular arc is 0.5 ~ 5mm, the big 0 ~ 2mm of radius of the said inner face circular arc of radius ratio of said outer face circular arc.
The outer conical surface length of said external seal face is 5 ~ 20mm, and the length of said inner sealing surface is than the long half pitch of length of said outer conical surface.
The thickness of said inner sealing surface is 4 ~ 15mm, and the thickness of said external seal face equates with the thickness of said inner sealing surface.
The inwall of said body end is provided with inner cylinder face, and said inner cylinder face links to each other with the endoporus of said body through the transition conical surface.
The length of said inner cylinder face is 0 ~ 20mm, and the length of said transition plane is 0 ~ 15mm.
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, increased a shape metallic leak-proof structure, made it after interference fit, 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, outer conical surface 13, inner sealing surface length 14, external seal face thickness 15, inner sealing surface thickness 16, outer face circular arc 17, inner face circular arc 18, outer face chamfering 19, inner face chamfering 20, inner cylinder face 21, the transition conical surface 22, internal conical surface 23, the transition conical surface 24, inner sealing surface 25, external seal face 26, middle line 27, interior stepped hole cylinder 28, middle cylinder 29 etc.
Like Fig. 1, shown in Figure 2, the present invention is a kind of special round thread tubing and casing jointing, 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 27, 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 29 of ring-type at the axial middle part of box cupling 1 inwall again, be respectively arranged with shape metallic leak-proof structure between the end of the both ends of the surface of middle cylinder 29 and body 2,3.Shape metallic leak-proof structure comprises the inner sealing surface 25 that is arranged on the box cupling 1 and is arranged on the external seal face 26 on the body 2,3.
As shown in Figure 4, inner sealing surface 25 comprises the internal conical surface 23 and the transition conical surface 24 that is arranged between middle cylinder 29 end faces and box cupling 1 internal threaded end.The tapering of internal conical surface 23 is identical with the tapering of screw thread 4, and the tapering of the transition conical surface 24 is greater than the tapering of screw thread 4, seamlessly transits simultaneously externally to reach it that sealing surface 26 plays guide effect.The end face of middle cylinder 29 is formed slopely inner face chamfering 20 to the outside, and the value of inner face chamfering 20 is 10 ° ~ 45 °.Be provided with inner face circular arc 18 between the end face of middle cylinder 29 and the internal conical surface 23, the radius of inner face circular arc 18 is 0.5 ~ 5mm.The length 14 of inner sealing surface 25 is than the long half pitch 11 of length of outer conical surface 13, and internal conical surface 23 length are 5 ~ 15mm, and the length of the transition conical surface 24 is 2 ~ 10mm, and the thickness 16 of inner sealing surface 25 is 4 ~ 15mm.
As shown in Figure 5; External seal face 26 comprises the outer conical surface 13 that is arranged on body 2, the 3 end outer walls; The tapering of outer conical surface 13 is identical with the tapering of screw thread 4; And the surface of outer conical surface 13 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, and its size Control is at 0.5 ~ 1.5mm.The end face of body 2,3 ends slopes inwardly and forms outer face chamfering 19; Outer face chamfering 19 is littler 0 ~ 3 ° than the value of inner face chamfering 20, can satisfy repeatedly machine like this and twist and to connect its contact surface of back and still form interference fit and play sealing function and play high torque resistant effect simultaneously.Be provided with outer face circular arc 17 between outer face chamfering 19 and the outer conical surface 13, the big 0 ~ 2mm of radius of the radius ratio inner face circular arc 18 of outer face circular arc 17 can satisfy repeatedly machine like this and twist and to connect its contact surface of back and still form interference fit and play sealing function.Outer conical surface 13 length of external seal face 26 are 5 ~ 20mm, and the thickness 15 of external seal face 26 equates with the thickness 16 of inner sealing surface 25.The inwall of body end is provided with inner cylinder face 21, and inner cylinder face 21 links to each other with the endoporus of body through the transition conical surface 22.The length of inner cylinder face 21 is 0 ~ 20mm, and the length of transition plane 22 is 0 ~ 15mm.The length of inner cylinder face 21 and transition plane 22 can be stipulated according to body 2,3 wall thickness amounts, makes it after closely cooperating, can keep same cylinder to seamlessly transit with interior stepped hole cylinder 28 and gets final product.
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 25; 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 25 and external seal face 26 and internal and external threads 4.Same fastening method; Is that benchmark closely cooperate with body 3 with virtual middle line 27 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; 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. special round thread tubing and casing 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 (29) of ring-type; Be respectively arranged with shape metallic leak-proof structure between the end of the both ends of the surface of cylinder (29) and said body (2,3) in the middle of said, said shape metallic leak-proof structure comprises the inner sealing surface (25) that is arranged on the said box cupling (1) and is arranged on the external seal face (26) on the said body (2,3); Said inner sealing surface (25) comprises the internal conical surface (23) and the transition conical surface (24) that is arranged between said middle cylinder (29) end face and said box cupling (1) internal threaded end, and the end face of said middle cylinder (29) is formed slopely inner face chamfering (20) to the outside; Said external seal face (26) comprises the outer conical surface (13) that is arranged on said body (2,3) the end outer wall, and the end face of said body (2,3) end slopes inwardly and forms outer face chamfering (19).
2. according to the described special round thread tubing and casing jointing of claim 1, it is characterized in that: the value of said inner face chamfering (20) is 10 ° ~ 45 °, and said outer face chamfering (19) is littler 0 ~ 3 ° than the value of said inner face chamfering (20).
3. according to the described special round thread tubing and casing jointing of claim 1; It is characterized in that: the tapering of said internal conical surface (23) is identical with the tapering of said screw thread (4); The tapering of the said transition conical surface (24) is provided with inner face circular arc (18) greater than the tapering of said screw thread (4) between the end face of said middle cylinder (29) and the said internal conical surface (23); The tapering of said outer conical surface (13) is identical with the tapering of said screw thread (4); And the surface of said outer conical surface (13) is lower than element of cone at the bottom of the tooth of said screw thread (4), is provided with outer face circular arc (17) between said outer face chamfering (19) and the said outer conical surface (13).
4. according to the described special round thread tubing and casing jointing of claim 3, it is characterized in that: the radius of said inner face circular arc (18) is 0.5 ~ 5mm, the big 0 ~ 2mm of radius of the said inner face circular arc of the radius ratio of said outer face circular arc (17) (18).
5. according to the described special round thread tubing and casing jointing of claim 1; It is characterized in that: outer conical surface (13) length of said external seal face (26) is 5 ~ 20mm, and the length (14) of said inner sealing surface (25) is than the long half pitch (11) of length of said outer conical surface (13).
6. according to the described special round thread tubing and casing jointing of claim 1; It is characterized in that: the thickness (16) of said inner sealing surface (25) is 4 ~ 15mm, and the thickness (15) of said external seal face (26) equates with the thickness (16) of said inner sealing surface (25).
7. according to the described special round thread tubing and casing jointing of claim 1; It is characterized in that: the inwall of said body (2,3) end is provided with inner cylinder face (21), and said inner cylinder face (21) links to each other through the endoporus of the transition conical surface (22) with said body (2,3).
8. according to the described special round thread tubing and casing jointing of claim 7, it is characterized in that: the length of said inner cylinder face (21) is 0 ~ 20mm, and the length of said transition plane (22) is 0 ~ 15mm.
9. according to the described special round thread tubing and casing jointing 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 9 described special round thread tubing and casing jointings, 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 |
|---|---|---|---|
| CN2012100837996A CN102606086A (en) | 2012-03-27 | 2012-03-27 | Connecting joint with special knuckle threads for oil casing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100837996A CN102606086A (en) | 2012-03-27 | 2012-03-27 | Connecting joint with special knuckle threads for oil casing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102606086A true CN102606086A (en) | 2012-07-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012100837996A Pending CN102606086A (en) | 2012-03-27 | 2012-03-27 | Connecting joint with special knuckle threads for oil casing |
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| Country | Link |
|---|---|
| CN (1) | CN102606086A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109267968A (en) * | 2018-10-10 | 2019-01-25 | 西安奥德石油工程技术有限责任公司 | Electric heating apparatus of hollow sucker rod and oil production equipment |
| CN110847841A (en) * | 2019-10-11 | 2020-02-28 | 中国石油天然气股份有限公司 | Annular steel plate device |
Citations (6)
| 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 |
| CN1289019A (en) * | 1999-09-21 | 2001-03-28 | 西德尔卡有限公司 | Screwed pipe adapter with high-resistance to over torque and pressure |
| US20030067168A1 (en) * | 2000-06-20 | 2003-04-10 | Celine Sches | Tubular threaded joint with reinforced stop |
| CN2732980Y (en) * | 2004-08-18 | 2005-10-12 | 天津钢管有限责任公司 | Sawtooth casing threaded connection structure |
| CN201288903Y (en) * | 2008-09-28 | 2009-08-12 | 上海海隆石油管材研究所 | Oil sleeve screwed connection head of negative bearing angle |
| CN202578552U (en) * | 2012-03-27 | 2012-12-05 | 无锡西姆莱斯石油专用管制造有限公司 | Connecting joint with special knuckle threads for oil casing |
-
2012
- 2012-03-27 CN CN2012100837996A patent/CN102606086A/en active Pending
Patent Citations (6)
| 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 |
| CN1289019A (en) * | 1999-09-21 | 2001-03-28 | 西德尔卡有限公司 | Screwed pipe adapter with high-resistance to over torque and pressure |
| US20030067168A1 (en) * | 2000-06-20 | 2003-04-10 | Celine Sches | Tubular threaded joint with reinforced stop |
| CN2732980Y (en) * | 2004-08-18 | 2005-10-12 | 天津钢管有限责任公司 | Sawtooth casing threaded connection structure |
| CN201288903Y (en) * | 2008-09-28 | 2009-08-12 | 上海海隆石油管材研究所 | Oil sleeve screwed connection head of negative bearing angle |
| CN202578552U (en) * | 2012-03-27 | 2012-12-05 | 无锡西姆莱斯石油专用管制造有限公司 | Connecting joint with special knuckle threads for oil casing |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109267968A (en) * | 2018-10-10 | 2019-01-25 | 西安奥德石油工程技术有限责任公司 | Electric heating apparatus of hollow sucker rod and oil production equipment |
| CN110847841A (en) * | 2019-10-11 | 2020-02-28 | 中国石油天然气股份有限公司 | Annular steel plate device |
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Application publication date: 20120725 |