CN203420646U - Air-tight seal special thread connector structure for sleeve pipe - Google Patents
Air-tight seal special thread connector structure for sleeve pipe Download PDFInfo
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- CN203420646U CN203420646U CN201320482668.5U CN201320482668U CN203420646U CN 203420646 U CN203420646 U CN 203420646U CN 201320482668 U CN201320482668 U CN 201320482668U CN 203420646 U CN203420646 U CN 203420646U
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Abstract
The utility model provides an air-tight seal special thread connector structure for a sleeve pipe. The air-tight seal special thread connector structure comprises a male end and a female end. The male end is composed of male threads with taper, a male sealing face arranged on the end portions of the male threads, and a circular bead arranged at the top point of the male sealing face. The female end is a coupling which is of a symmetrical structure, and is composed of female threads with taper, a female sealing face arranged on the end portions of the female threads, and a circular bead arranged on the back face of the female sealing face. The male threads and the female threads are connected in a twisting mode, the male sealing face is in contact with the female sealing face, and the length of a central hole of the coupling satisfies the relation expression of Ld>2Lp and Lp=Ls*(sin15degree+cos15degree). The air-tight seal special thread connector structure has the advantages that under the condition that performance of the connector is guaranteed, the minimum length of a central hole is determined accurately, the interference of connectors at the two ends on a central hole influence area after buckling is avoided, coupling materials are saved, and production cost is saved. The connector structure sets the range of the length of the central hole, can be applied to threaded connection of any other types of sleeve pipes of threaded types or sealing face types.
Description
Technical field
The utility model relates to the air-sealed special threaded joint design for sleeve pipe of a kind of screw connection structure, particularly oil and gas industry.
Background technology
Tubing and casing tubing string adopts screw thread that single oil well pipe is formed by connecting, and the screw connection point of tubing string is weak key link.In general API standard, sleeve pipe adopts round thread or buttress thread type of attachment.The advantage of this joint is that technology maturation, cost of production are lower, and shortcoming is that screw thread should be born linkage function and bears again sealing function, and joint stress concentration phenomenon is serious.
Development along with petroleum industry, especially the exploitation of deep-well, ultradeep well, high-pressure gas well, directional well, sour environment well, functional performance to petroleum casing pipe is had higher requirement, the actual effect of the forms such as the sleeve pipe with API standard thread type of attachment easily ruptures in complex hole condition, slippage, leakage, brings huge loss to oil field.
In order to overcome the connection shortcoming of API screw thread, China Patent No. is ZL02209453.9, discloses a kind of petroleum casing pipe hermetic seal joint, and thread forms is buttress thread, and seal form, for cone is to cone metal sealing, is located stubborn connecing by torque shoulder.
China Patent No. is ZL200820144760.X, disclose a kind of casing threaded connection structure of special little clearance collar, solved casing joint because box cupling takies a part of well and cannot adopt the most effectively problem of pipe string design.
But above two patents all do not relate to the problem of the length of box cupling mesopore, if the long meeting of mesopore causes the waste of material; But if mesopore is too short, on the joint at two ends, the influence area of mesopore can be interfered after button, brings latus rectum is caused to adverse effect.
Summary of the invention
The utility model provides a kind of air-sealed special threaded joint design for sleeve pipe, to solve the definite problem of hole length in the box cupling existing in prior art, can reach the object of the optimization of box cupling material.
For achieving the above object, the technical solution adopted in the utility model is to provide a kind of air-sealed special threaded joint design for sleeve pipe, this structure includes the male end of sleeve pipe, it is comprised of the public sealing surface of the male thread with tapering, male thread end and the shoulder at place, public sealing surface summit, also has female end, be that box cupling is symmetrical structure, it is comprised of female sealing surface of the box thread with tapering, box thread end and the shoulder after female sealing surface, described male thread and box thread are mutually twisted and are connected together, male sealing surface, female sealing surface are in contact with one another, wherein:
The middle hole length (Ld) of described box cupling meets following relation:
Ld>2Lp，Lp=Ls*（sin15°+cos15°）
In formula: Ld---hole length in box cupling, Lp---shoulder influence area length, Ls---torque shoulder length.
Described thread tooth type is the inclined to one side acme thread of API, and the pitch of flute profile is per inch five teeth, and tapering is 1:16, and male thread tooth depth is 1.575mm, and box thread tooth depth is 1.575mm～1.778mm.
The tapering of described joint sealing face and casing axis is 1:10, and the angle of the described male and female shoulder axis of thread is negative 15 degree.
Effect of the present utility model is this joint design in the situation that guaranteeing joint performance, determines accurately the minimum length of mesopore, has avoided the interference to mesopore influence area after button on the joint at two ends, saves box cupling materials, has reduced cost of production.This joint design has provided the scope of middle hole length, and this effect can be applied to the screw thread of any other type, the casing thread connection structure of thread type or sealing surface type.
Accompanying drawing explanation
Fig. 1 is the utility model casing thread connection structural representation;
A, male end B, female end C, male thread D, box thread E, public sealing surface
Hole length in F, female sealing surface G, male shoulder H, female shoulder I, mesopore Ld, box cupling
Fig. 2 is that the utility model sleeve pipe profile of tooth coordinates schematic diagram;
Hp, male thread tooth depth Hb, box thread tooth depth
Fig. 3 is the rear shoulder schematic diagram of button on special buckle;
J, equivalent plastic strain region K, male and female step contact starting point Lp, shoulder influence area length L d, box cupling mesopore length L s, torque shoulder length
Fig. 4 is special buckle shoulder length schematic diagram when too short.
L, the place's bulge of box cupling mesopore
The specific embodiment
By reference to the accompanying drawings the air-sealed special threaded joint design for sleeve pipe of the present utility model is illustrated.
Air-sealed special threaded joint design for sleeve pipe of the present utility model, this structure includes the male end of sleeve pipe, it is comprised of the public sealing surface of the male thread with tapering, male thread end and the shoulder at place, public sealing surface summit, also has female end, be that box cupling is symmetrical structure, it is comprised of female sealing surface of the box thread with tapering, box thread end and the shoulder after female sealing surface, described male thread and box thread are mutually twisted and are connected together, male sealing surface, female sealing surface are in contact with one another, and the middle hole length (Ld) of described box cupling meets following relation:
Ld>2Lp，Lp=Ls*（sin15°+cos15°）
In formula: Ld---hole length in box cupling, Lp---shoulder influence area length, Ls---torque shoulder length.
Described thread tooth type is the inclined to one side acme thread of API, and the pitch of flute profile is per inch five teeth, and tapering is 1:16, and male thread tooth depth is 1.575mm, and box thread tooth depth is 1.575mm～1.778mm.The tapering of described joint sealing face and casing axis is 1:2.5～1:12, and the angle of the described male and female shoulder axis of thread is negative 15 degree.
Air-sealed special threaded joint design for sleeve pipe of the present utility model is achieved in that
As shown in Figure 1, this petroleum casing pipe Premium connection structure comprises that male end A and female end B two parts form, described sleeve pipe male end A is by inclined to one side ladder type male thread C and contain sealing surface E and public shoulder G partly forms, described box cupling B part connects between two sleeve pipes, both sides symmetrical configuration, comprises inclined to one side ladder type box thread D and female sealing surface F and the female shoulder H corresponding with male sealing surface.
The tooth form angle of described inclined to one side acme thread C and D is 13 degree, as shown in Figure 2.Wherein approaching face is 10 degree, and bearing surface is 3 degree, male thread tooth depth Hp=1.575mm, and box thread tooth depth Hb=1.778mm, pitch is 5.08mm, thread taper 1:16.Sealing surface E, F are 1:10 along body axis direction tapering, and square shoulder G, H angle and axis direction are negative 15 degree.
Air-sealed special threaded joint design for sleeve pipe of the present utility model is mostly comprised of threaded portion, hermetic unit.After button is twisted and to be connect on male and female screw thread, at pipe end shoulder, to top in the situation that, can continue to tighten, so there is axial interference to exist at torque shoulder place, at shoulder place, have less equivalent plastic strain region.If the torque ratio of tightening is larger, the mesopore place of box cupling can be progressively expanded in this plastic strain region to.Influence area is started to extend along 45 ° to box cupling mesopore place by step contact starting point.Because box cupling is comprised of two sections of symmetrical screw threads, sealing surface, steps, so when in use twisting and connect after button, the two ends of box cupling can be twisted and connect with two male ends, so the step on both sides all can influential region.
In the stubborn termination process of male end A and female end B, need to apply enough large stubborn relay square, make the shoulder G of male end and female end shoulder H mutually hold out against and produce a certain amount of interference.This is a necessary condition that guarantees this joint gas tightness.If moment of torsion is enough large, can by torque shoulder G, act on the mesopore I place of box cupling, form the region of stress concentration of a reflection shape, as shown in the J of Fig. 3.It is by step contact starting point K start along 45 ° in bore portion extend, the mid point of development length is Lp.Lp=Ls*（sin15°+cos15°）。
Because box cupling is comprised of two sections of symmetrical screw threads, sealing surface, steps, as shown in Figure 1, so the step on both sides all can influential region J, if the length of Lp is too short, the influence area J on both sides can intersect, as shown in Figure 4, and because the stress producing cannot discharge, symmetrical centre L place at box cupling can produce a bulge, and latus rectum is had to adverse effect.When Ld >=2Lp, can guarantee that two shoulders of box cupling are all non-intersect to its mesopore generation strain region.Thereby guarantee latus rectum not to be caused to adverse effect.
Claims (3)
1. the air-sealed special threaded joint design for sleeve pipe, this structure includes the male end of sleeve pipe, it is comprised of the public sealing surface of the male thread with tapering, male thread end and the shoulder at place, public sealing surface summit, also has female end, be that box cupling is symmetrical structure, it is comprised of female sealing surface of the box thread with tapering, box thread end and the shoulder after female sealing surface, and described male thread and box thread are mutually twisted and are connected together, male sealing surface, female sealing surface are in contact with one another, and it is characterized in that:
The middle hole length (Ld) of described box cupling meets following relation:
Ld>2Lp，Lp=Ls*（sin15°+cos15°）
In formula: Ld---hole length in box cupling, Lp---shoulder influence area length, Ls---torque shoulder length.
2. the air-sealed special threaded joint design of sleeve pipe according to claim 1, it is characterized in that: described thread tooth type is the inclined to one side acme thread of API, the pitch of flute profile is per inch five teeth, and tapering is 1:16, male thread tooth depth is 1.575mm, and box thread tooth depth is 1.575mm～1.778mm.
3. the air-sealed special threaded joint design of sleeve pipe according to claim 1, is characterized in that: the tapering of described joint sealing face and casing axis is 1:10, and the angle of the described male and female shoulder axis of thread is negative 15 degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320482668.5U CN203420646U (en) | 2013-08-06 | 2013-08-06 | Air-tight seal special thread connector structure for sleeve pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320482668.5U CN203420646U (en) | 2013-08-06 | 2013-08-06 | Air-tight seal special thread connector structure for sleeve pipe |
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| Publication Number | Publication Date |
|---|---|
| CN203420646U true CN203420646U (en) | 2014-02-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320482668.5U Expired - Lifetime CN203420646U (en) | 2013-08-06 | 2013-08-06 | Air-tight seal special thread connector structure for sleeve pipe |
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| Country | Link |
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| CN (1) | CN203420646U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103397853A (en) * | 2013-08-06 | 2013-11-20 | 天津钢管集团股份有限公司 | Special air sealing threaded connector structure for casing pipe |
-
2013
- 2013-08-06 CN CN201320482668.5U patent/CN203420646U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103397853A (en) * | 2013-08-06 | 2013-11-20 | 天津钢管集团股份有限公司 | Special air sealing threaded connector structure for casing 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 |
Effective date of registration: 20190702 Address after: No. 396 Jintang Highway, Dongli District, Tianjin 300301 Patentee after: Tianjin Steel Tube Manufacturing Co.,Ltd. Address before: No. 396 Jintang Highway, Dongli District, Tianjin 300301 Patentee before: TIANJIN PIPE (GROUP) Corp. |
|
| TR01 | Transfer of patent right | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140205 |
|
| CX01 | Expiry of patent term |