CN202140036U - Threaded oil/sleeve pipe connector for air-tight sealing structure - Google Patents
Threaded oil/sleeve pipe connector for air-tight sealing structure Download PDFInfo
- Publication number
- CN202140036U CN202140036U CN201120259344U CN201120259344U CN202140036U CN 202140036 U CN202140036 U CN 202140036U CN 201120259344 U CN201120259344 U CN 201120259344U CN 201120259344 U CN201120259344 U CN 201120259344U CN 202140036 U CN202140036 U CN 202140036U
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- Prior art keywords
- oil
- sleeve pipe
- angle
- box cupling
- negative angle
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- Expired - Lifetime
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- 238000007789 sealing Methods 0.000 title claims abstract description 47
- 230000007704 transition Effects 0.000 claims description 7
- 238000005553 drilling Methods 0.000 abstract description 7
- 238000005065 mining Methods 0.000 abstract description 4
- 238000005452 bending Methods 0.000 abstract description 2
- 239000003129 oil well Substances 0.000 abstract description 2
- 239000000853 adhesive Substances 0.000 abstract 1
- 230000001070 adhesive effect Effects 0.000 abstract 1
- 210000002445 nipple Anatomy 0.000 description 7
- 239000002184 metal Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 238000006056 electrooxidation reaction Methods 0.000 description 3
- 230000035939 shock Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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Abstract
The utility model provides a threaded oil/sleeve pipe connector for an air-tight sealing structure. The threaded oil/sleeve pipe connector comprises a pipe body, wherein the pipe body is provided with outer threads, a connecting hoop provided with inner threads is sleeved at the outer part of the pipe body, and the inner threads and the outer threads are provided with guide faces and negative angle bearing faces; and the threaded oil/sleeve pipe connector is characterized in that an angle of the threaded oil/sleeve pipe connector is between -3 degrees and -5 degrees, a conical sealing surface is arranged at the end part of the pipe body and is in interference fitting with an inner wall of the connecting hoop so as to achieve the sealing purpose, and the interference fitting length is larger than 17.8mm. The threaded oil/sleeve pipe connector has the advantages of high connection strength, reliability in sealing, high resistance to bending, easiness and quickness for fastening, no easy for wrong fastening, and high resistance to adhesive fastening, excessive torque and anticorrosion performance, is suitable for drilling operation in a deep well, an ultra deep well, a high-pressure gas well, an oil well and a heat mining well as well as under severe environments such as in a desert, on the sea and the like, and can be repeatedly fastened and unfastened without damaging the threads; and the connection strength of the connector can be matched with the strength of the pipe body and the like, and is even higher than that of the pipe body.
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 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 a kind of oil/casing threads jointing of hermetic seal structure; Comprise and be 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 angle of said negative angle bearing surface is-3 °～-5 °; Be 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 greater than 17.8mm.
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 0.25mm.
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-17 °, 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 15 ° 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 the oil/casing threads jointing of a kind of hermetic seal structure that Fig. 1 provides for the utility model;
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 oil of a kind of hermetic seal structure that the utility model provides/casing threads jointing can be used on oil pipe or the sleeve pipe, and is as shown in Figure 1, comprises being with externally threaded body 1, outside body 1, is with tapped box cupling 2.In conjunction with Fig. 2, internal thread and external screw thread have spigot surface 3 and negative angle bearing surface 4, and the angle of negative angle bearing surface 4 is-3 °～-5 °.
The angle of the bearing surface of general nipple all is a 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 of negative angle bearing surface 4 (that is, the angle between negative angle bearing surface 4 and the axis of thread vertical line) is-3 °～-5 °, and it mainly acts on is the ability that adds the major thread bearing load.This negative angle bearing surface 4 does not play the effect of sealing simultaneously.This has great different on performance with general＜bearing surface of-2 °.In the utility model; 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 1, make threaded connector and body become the identical integral body of technical performance, security reliability has had very effectively raising.
In conjunction with Fig. 3, be formed with circular cone sealing surface 5 in the end of 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 greater than 17.8mm.
Whether the sealing performance of nipple integral body 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.Its shortcoming is: poor sealing performance, and 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 the circular cone sealing surface 5 of screw thread front end; Rely on body 1 and box cupling 2 outer internal conical surfaces; Through accurate machining, guarantee the precision-fit between the two and accomplish the sealing of metal to metal face that the interference length of sealing surface is greater than 17.8mm.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.
In conjunction with Fig. 2, the chamfer radius of the circular arc chamfering 11 of spigot surface 3 crests is less than 0.5mm.
General screw thread spigot surface all has circular arc chamfering; But the crest chamfer radius of spigot surface all＞0.5mmR, though the circular arc chamfering of orthodrome, make screw thread to go up button comparatively convenient with make-up; But it is anti-threads 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 threads off.And the chamfer radius of the circular arc chamfering 11 in the utility model is less than 0.5mm, and characteristics are that button and make-up are difficult for threading off easily under the situation on guaranteeing; Under than the macrobending state, the ability of resistance to shock loads is strong, has satisfied the condition of special macrobending drilling; Good reliability is difficult for threading off.
Leave gap 10 between externally threaded tooth top and the internal thread greater than 0.25mm.
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 in the utility model; Leave gap 10 between externally threaded tooth top and the internal thread greater than 0.25mm; Be because bearing surface 4 not as main sealing surface, can leave the leeway of stretching, extension simultaneously than the macrobending angle time.Bigger tip clearance 10 can also be stored more extraordinary thread compound, increases the 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.
In conjunction with Fig. 3, 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-17 °, 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 the negative angle of the utility model is antitorque apart from shoulder 7, and its negative angle is bigger, is negative 17 °; If torque overload when last button, at this moment negative angle is antitorque will produce outside thrust apart from shoulder 7, and torque overload is big more; The active force that produces makes the combination of circular cone sealing surface 5 tight more, makes sealing performance better, the antitorque accuracy that has promptly guaranteed last button apart from shoulder 7 of negative angle; Also improved the gas sealing ability of nipple, simultaneously the antitorque effect of also having played auxiliary seal apart from shoulder 7 of negative angle.
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.
O-ring nose 6 is circular cone sealing surface 5 and the antitorque excessive end apart from shoulder 7 of negative angle; The circular arc of big radian has guaranteed that promptly 5 engagements of circular cone sealing surface import steadily; Guarantee again that when producing the overload moment of torsion the antitorque deboost that produces apart from shoulder 7 of negative angle can evenly be transmitted to circular cone sealing surface 5, guarantees that the combination of circular cone sealing surface 5 is tightr; And can not produce stress raisers; Because circular cone sealing surface 5 is interference fit, O-ring nose 6 can effectively prevent the generation of the dropout of this part, repeats button and can keep good sealing property equally simultaneously.
Be formed with an angle in the inwall junction of body 1 and box cupling 2 respectively and be 15 ° 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 the joint of the utility model, link has a transition chamfering, and chamfering is 15 °; After last button is tightened; Because the distortion that interference fit produces is combined closely link fully, avoided local electrochemical corrosion to produce, guaranteed the dependability of nipple.
Claims (6)
1. the oil of a hermetic seal structure/casing threads jointing; Comprise and be 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), it is characterized in that: the angle of said negative angle bearing surface (4) is-3 °～-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 greater than 17.8mm.
2. the oil of a kind of hermetic seal structure as claimed in claim 1/casing threads jointing is characterized in that: the chamfer radius of the circular arc chamfering (11) of said spigot surface (3) crest is less than 0.5mm.
3. the oil of a kind of hermetic seal structure as claimed in claim 1/casing threads jointing is characterized in that: leave the gap (10) greater than 0.25mm between said externally threaded tooth top and the said internal thread.
4. the oil of a kind of hermetic seal structure as claimed in claim 1/casing threads jointing; 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-17 °, and the end face of said body (1) matches apart from shoulder (7) with this negative angle is antitorque.
5. the oil of a kind of hermetic seal structure as claimed in claim 4/casing threads jointing; 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 oil of a kind of hermetic seal structure as claimed in claim 1/casing threads jointing 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 15 ° inboard wall of tube body chamfering (8) and box cupling inwall chamfering (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120259344U CN202140036U (en) | 2011-07-21 | 2011-07-21 | Threaded oil/sleeve pipe connector for air-tight sealing structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120259344U CN202140036U (en) | 2011-07-21 | 2011-07-21 | Threaded oil/sleeve pipe connector for air-tight sealing structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202140036U true CN202140036U (en) | 2012-02-08 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120259344U Expired - Lifetime CN202140036U (en) | 2011-07-21 | 2011-07-21 | Threaded oil/sleeve pipe connector for air-tight sealing structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202140036U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102287143A (en) * | 2011-07-21 | 2011-12-21 | 大庆福斯特科技开发有限公司 | Oil/sleeve pipe threaded connection joint with air-tight structure |
| CN119507842A (en) * | 2025-01-20 | 2025-02-25 | 威飞海洋装备制造有限公司 | A casing mudline suspension system and its delivery method and use method |
-
2011
- 2011-07-21 CN CN201120259344U patent/CN202140036U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102287143A (en) * | 2011-07-21 | 2011-12-21 | 大庆福斯特科技开发有限公司 | Oil/sleeve pipe threaded connection joint with air-tight structure |
| CN102287143B (en) * | 2011-07-21 | 2013-08-07 | 大庆福斯特科技开发有限公司 | Oil/sleeve pipe threaded connection joint with air-tight structure |
| CN119507842A (en) * | 2025-01-20 | 2025-02-25 | 威飞海洋装备制造有限公司 | A casing mudline suspension system and its delivery method and use method |
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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 |
Effective date of registration: 20170815 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. |
|
| TR01 | Transfer of patent right | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120208 |
|
| CX01 | Expiry of patent term |