CN203978315U - A kind of special hermetic seal oil connection of little external diameter for low-permeability oil deposit - Google Patents
A kind of special hermetic seal oil connection of little external diameter for low-permeability oil deposit Download PDFInfo
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- CN203978315U CN203978315U CN201420403188.XU CN201420403188U CN203978315U CN 203978315 U CN203978315 U CN 203978315U CN 201420403188 U CN201420403188 U CN 201420403188U CN 203978315 U CN203978315 U CN 203978315U
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Abstract
The utility model discloses the special hermetic seal oil connection of the little external diameter of a kind of low-permeability oil deposit, comprise joint body, described joint body two-port inwall is offered internal thread, described joint body is enclosed within by internal thread rotation on the external screw thread of offering body end, at the bottom of internal thread tooth, forms with external screw thread tooth top the gap that is used for storing the unnecessary thread compound of button rear thread part.Described joint body internal thread root arranges the conical surface and cylinder successively continuously, described body external screw thread end also arranges the conical surface and cylinder successively continuously, the conical surface of the conical surface of described internal thread root and external screw thread end closely cooperates and forms conical surface seal pair, and the cylinder of the cylinder of described internal thread root and external screw thread end closely cooperates and forms cylinder sealing pair.The utlity model has three grades of metal sealings and two negative angle shoulder structures, good seal performance, anti-stick button ability are strong, the feature that reliability is high.
Description
Technical field
The utility model relates to oil connection, specifically the special hermetic seal oil connection of little external diameter for a kind of low-permeability oil deposit.
Background technology
Oil pipe is in petroleum drilling and mining process, to require the degree of depth machinery converted products high, consumption is large.In actual use, be by spiral marking connection form, single oil pipe to be connected to become and 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, oil connection is threaded be ensure that drilling process safety is crucial reliably.The API oil connection that China oil field is used at present, these joints are mostly single-stage shape metallic leak-proof structure.The disadvantage of this class formation is: bonding strength is low, gas sealing ability is poor, reason is at lower well operations, while bearing larger axial load or bending load, once the single-stage sealing surface of joint is impaired or larger distortion occurs, the sealability of joint will obviously reduce, and failure accidents even occurs.Along with the lasting exploration and development of oil-gas resource, the exploitation of the oil gas field of the corrosive mediums such as sulfide hydrogen, carbon dioxide increases day by day, and the working environment of oil connection is also day by day severe and complicated.Common AP work modular connection can not meet existing engineering requirement.In addition, along with oil field development enters the middle and later periods, hole diameter is more and more less, and little external diameter oil connection becomes the necessity of oil field development, for overcoming the problems referred to above, need to develop not only economy, gas sealing ability but also oil connection reliably of one.
Summary of the invention
The purpose of this utility model is to provide the little external diameter of a kind of low-permeability oil deposit special hermetic seal oil connection, can overcome the problem that existing oil connection bonding strength is low, gas sealing ability is poor, there is three grades of metal sealings and two negative angle shoulder structure, good seal performance, anti-stick button ability are strong, the feature that reliability is high.
In order to reach above-mentioned purpose, the utility model has adopted following technical scheme, a kind of special hermetic seal oil connection of little external diameter for low-permeability oil deposit, comprise joint body, described joint body two-port inwall is offered internal thread, described joint body is enclosed within by internal thread rotation on the external screw thread of offering body end, at the bottom of internal thread tooth, forms with external screw thread tooth top the gap that is used for storing the unnecessary thread compound of button rear thread part.
Described joint body internal thread root arranges the conical surface and cylinder successively continuously, described body external screw thread end also arranges the conical surface and cylinder successively continuously, the conical surface of the conical surface of described internal thread root and external screw thread end closely cooperates and forms conical surface seal pair, and the cylinder of the cylinder of described internal thread root and external screw thread end closely cooperates and forms cylinder sealing pair.
The two ends of described cylinder sealing pair form respectively one-level negative angle shoulder, secondary negative angle shoulder, are jointly formed as two negative angle shoulders.
The close secondary envelope of the described conical surface is interference fit, the magnitude of interference 0.15～0.25mm, and cylinder sealing pair is matched in clearance, 0.05～0.15mm; The screw thread of joint 1 every one end is buttress thread, pitch is every 25.4mm6 tooth, tapering 1:14, internal thread height is 1.55mm, and externally threaded tooth depth is 1.50mm, 13 °, screw thread spigot surface tooth form angle, 4 °, screw thread bearing surface tooth form angle, two negative angle shoulders adopt negative angle bearing surface, and bearing surface angle is-9 °～-17 °, and spigot surface angle is+3 °～+ 15 °.
The gap value in the described gap that is used for storing the unnecessary thread compound of button rear thread part is 0.03～0.10mm.
In the middle of described joint body inwall, inner convex platform is set, the medial surface of this inner convex platform is concordant with inboard wall of tube body, forms concordant endoporus.
Compared to prior art, the utlity model has following beneficial effect:
The metal covering hermetic unit of joint is three grades of hermetically-sealed constructions, and the contact of three grades of hermetically-sealed constructions can supplement mutually, and sealing reliability is high.Joint adopts the special buttress thread after parameter design optimization, and stress distribution is even, has eliminated to greatest extent stress concentration phenomenon, has improved bonding strength.The tooth depth of internal and external threads designs a gap, can store the unnecessary thread compound of button rear thread part, reduces the thread compound pressure of threaded portion, when unnecessary thread compound can form sealing pair, can improve the speed of upper shackle and fall, the probability that low thread gluing phenomenon occurs.Therefore, the utlity model has that bonding strength is high, good seal performance, the fast advantage of strong, the upper break-out speed of anti-stick button ability.
Brief description of the drawings
Fig. 1 is the structural representation of a kind of low-permeability oil deposit of the present utility model special hermetic seal oil connection of little external diameter;
Fig. 2 is A part enlarged drawing in Fig. 1;
Fig. 3 is B part enlarged drawing in Fig. 1.
In figure: 1 is joint body; 2 is body; 3 is the part that is threaded; 4 is metal sealing part; 5 is two negative angle shoulders; 6 is concordant endoporus; 7 is external screw thread; 8 is internal thread; 9 is conical surface seal pair; 10 is cylinder sealing pair; 11 is one-level negative angle shoulder; 12 is secondary negative angle shoulder.
Detailed description of the invention
Relevant detailed description of the present utility model and technology contents, coordinate brief description of the drawings as follows, but accompanying drawing only provides the use of reference with explanation, is not used for the utility model to be limited.
With reference to accompanying drawing 1-3, a kind of special hermetic seal oil connection of little external diameter for low-permeability oil deposit, comprise joint body 1, described joint body two-port inwall is offered internal thread 8, described joint body is enclosed within by internal thread rotation on the external screw thread 7 of offering body 2 ends, at the bottom of internal thread tooth, forms with external screw thread tooth top the gap that is used for storing the unnecessary thread compound of button rear thread part.Described joint body internal thread root arranges the conical surface and cylinder successively continuously, described body external screw thread end also arranges the conical surface and cylinder successively continuously, the conical surface of the conical surface of described internal thread root and external screw thread end closely cooperates and forms conical surface seal pair 9, and the cylinder of the cylinder of described internal thread root and external screw thread end closely cooperates and forms cylinder sealing pair 10.The two ends of described cylinder sealing pair form respectively one-level negative angle shoulder 11, secondary negative angle shoulder 12, are jointly formed as two negative angle shoulders 5.In the middle of described joint body inwall, inner convex platform is set, the medial surface of this inner convex platform is concordant with inboard wall of tube body, forms concordant endoporus 6.
As shown in Figure 1, joint 1 two ends are symmetrical structure, and two ends are connected with body 2 respectively; Joint 1 by the part 3 that is threaded, metal covering hermetic unit 4, two negative angle shoulder 5,, concordant endoporus 6 etc. forms.As shown in Figure 2, after joint 1 coordinates with body 2, owing to there are differences between internal and external threads tooth depth, make at the bottom of internal thread tooth 8 to have certain gap with external screw thread tooth 7 tops, can store the unnecessary thread compound of button rear thread part, reduce the thread compound pressure of threaded portion.Gap value is 0.03～0.10mm.When unnecessary thread compound can form sealing pair, can improve the speed of upper shackle and fall, the probability that low thread gluing phenomenon occurs.Metal covering hermetic unit 4 is three grades of hermetically-sealed constructions, as shown in Figure 3, is made up of conical surface seal pair 9, cylinder sealing pair 10 and two negative angle shoulder sealing pair 11,12.After joint 1 and body 2 screw and be connected, the close secondary envelope 9 of the conical surface is interference fit, the magnitude of interference 0.15～0.25mm, and cylinder sealing pair 10 is matched in clearance, 0.05～0.15mm.The screw thread of joint 1 every one end is special buttress thread, pitch is every 25.4mm6 tooth, tapering 1:14, internal thread height is 1.55mm, externally threaded tooth depth is 1.50mm, 13 °, screw thread spigot surface tooth form angle, 4 °, screw thread bearing surface tooth form angle, shoulder 11,12 adopts negative angle bearing surfaces, is beneficial to the quick location of detaining on joint and the torque wrench moment of hyperabsorption, bearing surface angle is-9 °～-17 °, and spigot surface angle is+3 °～+ 15 °.
1, metal covering hermetic unit is three grades of hermetically-sealed constructions, is made up of cylinder sealing pair, conical surface seal pair and negative angle shoulder sealing pair.Primary seal face is cylinder sealing pair, adopts matched in clearance, not thread gluing when being beneficial to the quick of joint and repeatedly going up shackle; Secondary seal adopts conical surface sealing structure, has overcome the difficult processing of ball face sealing, the problem that construction requirement is high; Three grades are sealed into two negative angle shoulder sealing pairs, two negative angle shoulders can absorb the torque load of overload, when improving the anti-combined load ability of joint, also play the effect of auxiliary seal, three grades of seal combination form the region of high stress of a longer wedge effect, the contact of three grades of hermetically-sealed constructions can supplement mutually, and sealing reliability is high.
2, joint internal and external threads adopts the special buttress thread after parameter design optimization, and stress distribution is even, has eliminated to greatest extent stress concentration phenomenon, has improved sealing performance and bonding strength and anti-stick button ability.Pitch is every 25.4mm6 tooth, tapering 1:14, and internal thread height is 1.55mm, externally threaded tooth depth is 1.50mm, 13 °, screw thread spigot surface tooth form angle, 4 °, screw thread bearing surface tooth form angle; Described shoulder adopts negative angle bearing surface, and bearing surface angle is-9 °～-17 °, and spigot surface angle is+3 °～+ 15 °.
3, internal thread tooth depth, slightly lower than external screw thread tooth depth, can store the unnecessary thread compound of button rear thread part, reduces the thread compound pressure of threaded portion.API screw thread advises adopting thread compound conventionally, unnecessary thread compound is pushed has affected the magnitude of interference of detaining on screw thread, for this reason, between the inside and outside tooth depth of design, there is one 0.03～0.10mm gap, when unnecessary thread compound can form sealing pair, can improve the speed of upper shackle and fall, the probability that low thread gluing phenomenon occurs.
The foregoing is only preferred embodiment of the present utility model, non-in order to limit the scope of the claims of the present utility model, other use the equivalence of patent spirit of the present utility model to change, and all should all belong to the scope of the claims of the present utility model.
Claims (6)
1. the special hermetic seal oil connection of little external diameter for low-permeability oil deposit, comprise joint body, it is characterized in that, described joint body two-port inwall is offered internal thread, described joint body is enclosed within by internal thread rotation on the external screw thread of offering body end, at the bottom of internal thread tooth, forms with external screw thread tooth top the gap that is used for storing the unnecessary thread compound of button rear thread part.
2. the special hermetic seal oil connection of little external diameter for a kind of low-permeability oil deposit according to claim 1, it is characterized in that, described joint body internal thread root arranges the conical surface and cylinder successively continuously, described body external screw thread end also arranges the conical surface and cylinder successively continuously, the conical surface of the conical surface of described internal thread root and external screw thread end closely cooperates and forms conical surface seal pair, and the cylinder of the cylinder of described internal thread root and external screw thread end closely cooperates and forms cylinder sealing pair.
3. the special hermetic seal oil connection of little external diameter for a kind of low-permeability oil deposit according to claim 2, is characterized in that, the two ends of described cylinder sealing pair form respectively one-level negative angle shoulder, secondary negative angle shoulder, is jointly formed as two negative angle shoulders.
4. the special hermetic seal oil connection of little external diameter for a kind of low-permeability oil deposit according to claim 3, is characterized in that, the close secondary envelope of the described conical surface is interference fit, the magnitude of interference 0.15～0.25mm, and cylinder sealing pair is matched in clearance, 0.05～0.15mm; The screw thread of joint 1 every one end is buttress thread, pitch is every 25.4mm6 tooth, tapering 1:14, internal thread height is 1.55mm, and externally threaded tooth depth is 1.50mm, 13 °, screw thread spigot surface tooth form angle, 4 °, screw thread bearing surface tooth form angle, two negative angle shoulders adopt negative angle bearing surface, and bearing surface angle is-9 °～-17 °, and spigot surface angle is+3 °～+ 15 °.
5. the special hermetic seal oil connection of little external diameter for a kind of low-permeability oil deposit according to claim 1, is characterized in that, described in the gap value in the gap that is used for storing the unnecessary thread compound of button rear thread part be 0.03～0.10mm.
6. the special hermetic seal oil connection of little external diameter for a kind of low-permeability oil deposit according to claim 1, is characterized in that, in the middle of described joint body inwall, inner convex platform is set, and the medial surface of this inner convex platform is concordant with inboard wall of tube body, forms concordant endoporus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420403188.XU CN203978315U (en) | 2014-07-21 | 2014-07-21 | A kind of special hermetic seal oil connection of little external diameter for low-permeability oil deposit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420403188.XU CN203978315U (en) | 2014-07-21 | 2014-07-21 | A kind of special hermetic seal oil connection of little external diameter for low-permeability oil deposit |
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| Publication Number | Publication Date |
|---|---|
| CN203978315U true CN203978315U (en) | 2014-12-03 |
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|---|---|---|---|
| CN201420403188.XU Expired - Fee Related CN203978315U (en) | 2014-07-21 | 2014-07-21 | A kind of special hermetic seal oil connection of little external diameter for low-permeability oil deposit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105927167A (en) * | 2016-06-21 | 2016-09-07 | 西南石油大学 | Special-thread gas seal oil sleeve joint for ultra-deep wells |
| CN106194052A (en) * | 2016-09-05 | 2016-12-07 | 天津钢管集团股份有限公司 | High-performance nipple special buckle oil well pipe metal to metal seal structure |
| CN112824642A (en) * | 2019-11-20 | 2021-05-21 | 宝山钢铁股份有限公司 | Buttress thread joint with high anti-thread gluing performance |
-
2014
- 2014-07-21 CN CN201420403188.XU patent/CN203978315U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105927167A (en) * | 2016-06-21 | 2016-09-07 | 西南石油大学 | Special-thread gas seal oil sleeve joint for ultra-deep wells |
| CN105927167B (en) * | 2016-06-21 | 2018-07-10 | 西南石油大学 | A kind of special thread hermetic seal oil sleeve joint for ultradeep well |
| CN106194052A (en) * | 2016-09-05 | 2016-12-07 | 天津钢管集团股份有限公司 | High-performance nipple special buckle oil well pipe metal to metal seal structure |
| CN112824642A (en) * | 2019-11-20 | 2021-05-21 | 宝山钢铁股份有限公司 | Buttress thread joint with high anti-thread gluing performance |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141203 Termination date: 20190721 |
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| CF01 | Termination of patent right due to non-payment of annual fee |