CN202417332U - Connector structure for thread connection of oil tube or sleeve - Google Patents
Connector structure for thread connection of oil tube or sleeve Download PDFInfo
- Publication number
- CN202417332U CN202417332U CN2011204064894U CN201120406489U CN202417332U CN 202417332 U CN202417332 U CN 202417332U CN 2011204064894 U CN2011204064894 U CN 2011204064894U CN 201120406489 U CN201120406489 U CN 201120406489U CN 202417332 U CN202417332 U CN 202417332U
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- thread
- negative angle
- box cupling
- angle
- sleeve pipe
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- Expired - Lifetime
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- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
Abstract
The utility model provides a connector structure for thread connection of an oil tube or a sleeve, which comprises a tube body with an external thread, wherein the tube body is externally sleeved with a coupling with an internal thread, and the internal thread and the external thread have guide surfaces and negative angle bearing surfaces. The connector structure is characterized in that the thread pitch between the external thread and the internal thread is 3.175mm, the conical degree is 1.788 degrees, the angle of the negative angle bearing surface is -2 to -5 degrees, a conical sealing surface is formed at the end of the tube body, the conical sealing surface is in interference fit with the inner wall of the coupling so as to fulfill the sealing purpose, and the interference length is 17-18.50 mm. The connector structure has the advantages that the connector has high connection strength which can be matched with the strength of the tube body and the like, the sealing is reliable, the bending resistance capability is strong, the screwing-on operation is easy, the anti-thread gluing performance is good, the operations of screwing-on and screwing-off can be repeatedly carried out without damaging the threads, the excessive torque resistance capability is strong, and the corrosion resistance is good.
Description
Technical field
The utility model relates to a kind of oil pipe or sleeve pipe jointing structure that is used for petroleum drilling and mining.
Background technology
Oil pipe and sleeve pipe are to require the degree of depth machinery converted products high, that consumption is big in the petroleum drilling and mining process.In the use of reality, be to adopt screw thread that single oil pipe or sleeve pipe are connected to become to reach thousands of rice, and can bear hundreds of atmospheric long strings, be equivalent to a tubulose high-pressure bottle.Can the technical performance that wherein, is threaded be the key that guarantee that the drilling process is safe and reliable.Conventional what use is the round thread and the buttress thread joint of API standard in China, but the disadvantage of this joint is: bonding strength is low, gas sealing ability is poor.Along with the harshness day by day and the oil-gas mining technology rapid development of oil, gas well drilling environment, common API modular connection can not have been satisfied existing engineering requirement.
Summary of the invention
The purpose of the utility model provides the 8TPI thread connecting joint structure that a kind of bonding strength is high, air-tightness is good.
In order to achieve the above object, the technical scheme of the utility model has provided the thread connecting joint structure of a kind of oil pipe or sleeve pipe, comprises and is with externally threaded body; Outside body, be with tapped box cupling, internal thread and external screw thread have spigot surface and negative angle bearing surface, it is characterized in that: the pitch of said external screw thread and said internal thread is 3.175mm; Its tapering is 1.788 °, and the angle of said negative angle bearing surface is-2 °～-5 °, is formed with the circular cone sealing surface in the end of said body; The inwall interference fit of this circular cone sealing surface and said box cupling reaches sealing purpose, and interference length is 17.00～18.50mm.
Preferably, the chamfer radius of the circular arc chamfering of said spigot surface crest is less than 0.5mm.
Preferably, leave gap between said externally threaded tooth top and the said internal thread greater than 0.5mm.
Preferably, be positioned at said box cupling that to be formed with negative angle on the inwall of said internal thread rear end antitorque apart from shoulder, this angle is-15 °～-18 °, and the end face of said body matches apart from shoulder with this negative angle is antitorque.
Preferably, through the transition of O-ring nose, said negative angle is antitorque to match with sealing round nose end with transition structure between the said box cupling apart from shoulder between the end face of said body and the said circular cone sealing surface.
Preferably, being formed with an angle respectively in the inwall junction of said body and said box cupling is 12 °～16 ° inboard wall of tube body chamfering and box cupling inwall chamfering.
The utility model has the advantages that: 1, the joint bonding strength is high, can with body equal strength coupling, even have be higher than body, be applicable to deep-well, ultradeep well;
2, sealing is reliable, is applicable to high-pressure gas well, oil well and thermal production well;
3, bending resistance is strong, is applicable to inclined shaft, extended reach well and horizontal well;
4, go up button easily, detain on can be fast and be difficult for thread alternating, be applicable to the drillng operation under desert, the first-class adverse circumstances in ocean;
5, anti-stick button performance is good, can go up shackle repeatedly and does not damage screw thread;
6, resisted torque capability strong;
7, corrosion resistance and good.
Description of drawings
The section partial schematic diagram of a kind of oil pipe that Fig. 1 provides for the utility model or the thread connecting joint structure of sleeve pipe;
Fig. 2 is the enlarged drawing of A part among Fig. 1;
Fig. 3 is the enlarged drawing of B part among Fig. 1.
The specific embodiment
For making the utility model more obviously understandable, now with a preferred embodiment, and conjunction with figs. elaborates as follows.
In order to improve the deficiency that common API standard thread joint exists; The utility model has adopted the special construction screw thread design of non-API standard on the basis of API standard, promptly size, grade of steel, wall thickness are according to the API standard; And the design of employing special thread syndeton on the structure that connects; Increase special constructions such as antitorque apart from shoulder, the sealing of metal to metal circular cone, greatly improved the strength reliability that is threaded.
The thread connecting joint structure of a kind of oil pipe that the utility model provides or sleeve pipe can be used on oil pipe or the sleeve pipe, like Fig. 1 and shown in Figure 2, comprises and is with externally threaded body 1; Outside body 1, be with tapped box cupling 2; Internal thread and external screw thread have spigot surface 3 and negative angle bearing surface 4, and the pitch of said external screw thread and said internal thread is 3.175mm, and its tapering 13 is 1.788 °; The angle 11 of said negative angle bearing surface 4 is-2 °～-5 °; Be formed with circular cone sealing surface 5 in the end of said body 1, this circular cone sealing surface 5 reaches sealing purpose with the inwall interference fit of said box cupling 2, and interference length is 17.00～18.50mm.
The tooth form of general nipple, the angle of bearing surface all are positive angle.Purpose is through the interference engagement, forms several uncertain metal to metal contact seal faces, thereby reaches the effect of sealing.Though the bearing surface of some screw thread can reach negative angle; But the negative angle of general and axis normal line can be above 2 °; Though the supporting capacity of such negative angle bearing surface is stronger than the tooth form of positive-angle, but do not reach the supporting capacity degree identical with body.In special oil-gas field drill, still can't be used widely.And in the utility model, the angle 11 of negative angle bearing surface 4 is negative 2 °～5 °, and it mainly acts on is the ability that adds the major thread bearing load.This negative angle bearing surface does not play the effect of sealing simultaneously.This with general＜-2 ° of bearing surface screw threads have great different on performance.Because external screw thread and internal thread are hook-shaped engagement in the axial direction; So its tension, incompressible, anti-interior pressure and collapse resistance are greatly improved; Can be identical with the technical performance of body; Make threaded connector and body become the identical integral body of technical performance, security reliability has had very effectively raising.
Whether whole sealing performance is complete, just sees the degree that cooperatively interacts of taper seat.General joint sealing mainly is to be sealed into the master with teeth directional.Shortcoming: poor sealing performance, anti-externally pressure is big and during than the macrobending state, and whole sealing performance reduces greatly.The utility model has increased the design of screw thread nose circle bevel sealing surface; Rely on body 1 and 5 sealings of circular cone sealing surface; Through accurate machining, guarantee the precision-fit between the two and accomplish the sealing of metal to metal face that the interference length of circular cone sealing surface 5 is 17.00～18.50mm.The form of this kind sealing, owing to contact face length, rule, reliability height, under certain interference degree state; Be difficult for to leak, particularly under the state of macrobending, it is quite reliable that (only otherwise thread off) sealing performance still can keep; And can repeatedly go up button, be difficult for threading off.
Preferably, the chamfer radius of the circular arc chamfering 10 of spigot surface 3 crests is less than 0.5mm
General screw thread spigot surface all has circular arc chamfering, the crest chamfer radius of directed side all＞0.5mmR, though the spigot surface crest chamfering of orthodrome, make screw thread to go up button comparatively convenient with make-up; But it prevents threading off and under the macrobending state, the ability of resistance to shock loads greatly descends, and runs under the situation about having than the drilling of macrobending state; Very easily thread off, and the screw thread guiding side crest chamfering＜0.5mmR of my company's design, characteristics are button and make-ups easily under the situation on guaranteeing; Be difficult for threading off, under than the macrobending state, the ability of resistance to shock loads is strong; Satisfied the condition in special macrobending drilling, good reliability is difficult for threading off.
Preferably, leave gap 12 between externally threaded tooth top and the said internal thread greater than 0.5mm.
In general being threaded, tip clearance is all less, and reason is that the bearing surface of screw thread will play main sealing function; And the generally big＞0.50mm of tip clearance that is threaded of our design; Be because bearing surface not as main sealing surface, when integral body was in than the macrobending angle, whole coupling part left comparatively sufficient leeway of stretching; Guarantee the performance of not threading off and sealing; Bigger tip clearance can also be stored more extraordinary thread compound, increases the overall sealing performance of screw thread, is threaded in than sealing performance under macrobending or the shock loading and connection reliability so this structure design has greatly improved.
As shown in Figure 3, preferably, be positioned at box cupling 2 that to be formed with negative angle on the inwall of said internal thread rear end antitorque apart from shoulder 7, this angle is-15 °～-18 °, the end face of body 1 matches apart from shoulder 7 with this negative angle is antitorque.
General nipple does not adopt the design of torque resistant shoulder, and the antitorque requirement that does not also have antitorque distance overload apart from the shoulder design because of its angle is less of negative angle is adopted in some design.And in the utility model, the antitorque angle apart from shoulder 7 of negative angle is negative 15 °～18 °, if when last button torque overload; At this moment negative angle is antitorque will produce outside thrust apart from shoulder 7, and torque overload is big more, and the active force of generation makes the combination of taper seat tight more; Make sealing performance better, the antitorque establishment apart from shoulder 7 of negative angle has promptly guaranteed the accuracy of last button; Also improved the gas sealing ability of nipple, the torque resistant shoulder has also played the effect of auxiliary seal simultaneously.
Preferably, through 6 transition of O-ring nose, negative angle is antitorque to match with sealing round nose end 6 with transition structure between the box cupling 2 apart from shoulder 7 between the end face of body 1 and the circular cone sealing surface 5.
The design of O-ring nose 6 is special construction designs of the utility model; O-ring nose 6 is circular cone sealings and the circular arc of the antitorque excessive end apart from shoulder of negative angle, big radian, has guaranteed that promptly the taper seat engagement imports steadily, guarantees again when producing when transshipping moment of torsion; The deboost that torque shoulder produces can evenly be transmitted to taper seat; The combination of guaranteeing taper seat is tightr, and can not produce stress raisers, simultaneously because sealed end is an interference fit; The round nose end can effectively prevent the generation of the dropout of this part, repeats button and can keep good sealing property equally.
Preferably, being formed with an angle respectively in the inwall junction of body 1 and box cupling 2 is 12 °～16 ° inboard wall of tube body chamfering 8 and box cupling inwall chamfering 9.
General nipple body and box cupling inwall link do not have detailed requirement, because the electrochemical corrosion that does not closely cause this part easily that combines, a large amount of use-cases shows that all nipples lost efficacy, and major part is owing to electrochemical corrosion causes.And in the joint that the utility model provides; Be provided with inboard wall of tube body chamfering 8 and box cupling inwall chamfering 9; Chamfering is 12 °～16 °, after last button is tightened, because the distortion that interference fit produces is combined closely link fully; Avoid local electrochemical corrosion to produce, guaranteed the dependability of nipple.
Claims (6)
1. the thread connecting joint structure of oil pipe or sleeve pipe; Comprise and be with externally threaded body (1) that outside body (1), be with tapped box cupling (2), internal thread and external screw thread have spigot surface (3) and negative angle bearing surface (4); It is characterized in that: the pitch of said external screw thread and said internal thread is 3.175mm; Its tapering (13) is 1.788 °, and the angle (11) of said negative angle bearing surface (4) is-2 °～-5 °, is formed with circular cone sealing surface (5) in the end of said body (1); This circular cone sealing surface (5) reaches sealing purpose with the inwall interference fit of said box cupling (2), and interference length is 17.00～18.50mm.
2. the thread connecting joint structure of a kind of oil pipe as claimed in claim 1 or sleeve pipe is characterized in that: the chamfer radius of the circular arc chamfering (10) of said spigot surface (3) crest is less than 0.5mm.
3. the thread connecting joint structure of a kind of oil pipe as claimed in claim 1 or sleeve pipe is characterized in that: leave the gap (12) greater than 0.5mm between said externally threaded tooth top and the said internal thread.
4. the thread connecting joint structure of a kind of oil pipe as claimed in claim 1 or sleeve pipe; It is characterized in that: be positioned at said box cupling (2) that to be formed with negative angle on the inwall of said internal thread rear end antitorque apart from shoulder (7); This angle is-15 °～-18 °, and the end face of said body (1) matches apart from shoulder (7) with this negative angle is antitorque.
5. the thread connecting joint structure of a kind of oil pipe as claimed in claim 4 or sleeve pipe; It is characterized in that: through O-ring nose (6) transition, said negative angle is antitorque to match with sealing round nose end (6) with transition structure between the said box cupling (2) apart from shoulder (7) between the end face of said body (1) and the said circular cone sealing surface (5).
6. the thread connecting joint structure of a kind of oil pipe as claimed in claim 1 or sleeve pipe is characterized in that: be formed with an angle in the inwall junction of said body (1) and said box cupling (2) respectively and be 12 °～16 ° inboard wall of tube body chamfering (8) and box cupling inwall chamfering (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204064894U CN202417332U (en) | 2011-10-24 | 2011-10-24 | Connector structure for thread connection of oil tube or sleeve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204064894U CN202417332U (en) | 2011-10-24 | 2011-10-24 | Connector structure for thread connection of oil tube or sleeve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202417332U true CN202417332U (en) | 2012-09-05 |
Family
ID=46742105
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204064894U Expired - Lifetime CN202417332U (en) | 2011-10-24 | 2011-10-24 | Connector structure for thread connection of oil tube or sleeve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202417332U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115370300A (en) * | 2022-07-12 | 2022-11-22 | 大庆西姆莱斯石油专用管制造有限公司 | Nano-coating high-strength anti-galling anti-eccentric wear anti-corrosion anti-fouling special threaded oil pipe |
-
2011
- 2011-10-24 CN CN2011204064894U patent/CN202417332U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115370300A (en) * | 2022-07-12 | 2022-11-22 | 大庆西姆莱斯石油专用管制造有限公司 | Nano-coating high-strength anti-galling anti-eccentric wear anti-corrosion anti-fouling special threaded oil pipe |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170807 Address after: 163453, Daqing, Heilongjiang province to allow the District Ming Yuan Ming Lake Commercial Pedestrian Street (Zhujianglu Road 58) Patentee after: Xia Qinghua Address before: 163453, Daqing, Heilongjiang province to allow the District Ming Yuan Ming Lake Commercial Pedestrian Street (Zhujianglu Road 58) Patentee before: Daqing Fusite Technology Development Co., Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120905 |