CN202148872U

CN202148872U - Thread structure of airtight seal threaded joint

Info

Publication number: CN202148872U
Application number: CN201120266692U
Authority: CN
Inventors: 夏庆华
Original assignee: DAQING FUSITE TECHNOLOGY DEVELOPMENT Co Ltd
Priority date: 2011-07-21
Filing date: 2011-07-21
Publication date: 2012-02-22
Anticipated expiration: 2021-07-21

Abstract

The utility model provides a thread structure of an airtight seal threaded joint, which comprises thread teeth, two sides of the thread teeth are respectively a guide surface and negative angle bearing surface; and the thread structure is characterized in that the angle of the negative angle bearing surface is -3 degrees to 5 degrees. The thread structure has the following advantages: 1. being strong in joint connecting strength which can be matched with the strength of pipes and the like, and even higher than that of the pipe, thus being applicable to deep wells and superdeep wells; 2. being high in bending resistance, thus being applicable to inclined shafts, extended reach wells and horizontal wells; 3. being easy for screwing on, being quick to be screwed on and uneasy to generate thread alternating, thus being applicable to drilling operation in desert, ocean and other severe environment; 4. being good in thread gluing prevention performance, and being repeatable in screwing off, without damaging the thread; and 5. being strong in over-torsion resisting capability.

Description

The helicitic texture of air-tight seal screw joint

Technical field

The utility model relates to a kind of oil pipe of petroleum drilling and mining or helicitic texture of sleeve pipe jointing of being used for.

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 a kind of high helicitic texture of thread connecting joint bonding strength that improves.

In order to achieve the above object; The technical scheme of the utility model has provided a kind of helicitic texture of air-tight seal screw joint; Comprise thread, the both sides of thread are respectively spigot surface and negative angle bearing surface, it is characterized in that: the angle of said negative angle bearing surface is-3 °～-5 °.

Preferably, through the circular arc chamfering transition, the chamfer radius R of this circular arc chamfering is less than 0.5mm between the tooth top of said spigot surface and said thread.

Preferably, the angle of said spigot surface and said thread axis vertical line is 10 °.

Preferably, the tooth depth of said thread is 0.98～1.02mm, and its transverse tooth thickness is 2.1mm～2.15mm.

Preferably, the tapering of said thread is 1.788 °.

Preferably, said pitch is 4.233mm

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, bending resistance is strong, is applicable to inclined shaft, extended reach well and horizontal well;

3, 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;

4, anti-stick button performance is good, can go up shackle repeatedly and does not damage screw thread;

5, resisted torque capability strong.

Description of drawings

The section partial schematic diagram of the helicitic texture of a kind of air-tight seal screw joint that Fig. 1 provides for the utility model.

The specific embodiment

For making the utility model more obviously understandable, now with a preferred embodiment, and conjunction with figs. elaborates as follows.

The helicitic texture of a kind of air-tight seal screw joint that the utility model provides can be used on oil pipe or the sleeve pipe, and is as shown in Figure 1, comprises thread, and the both sides of thread are respectively spigot surface and negative angle bearing surface, and the angle 1 of negative angle bearing surface is-3 °～-5 °.

The angle of bearing surface is very important in the thread tooth, and it is related to the reliability that threaded integral connects.Can under the effect of overload moment of torsion, mesh effectively and do not thread off, situation such as do not thread off under than the effect of macrobending load all be directly connected to the angle of thread tooth bearing surface.The thread tooth of the utility model; The angle 1 of its bearing surface and axis of thread vertical line is-3 °～-5 °, can improve the ability of the overload-resistant moment of torsion of threaded connector effectively, and screw thread is not threaded off when repeatedly using; Under the effect of high pulling torque; The screw thread bearing surface can produce oblique regular contact force, has greatly reduced the risk of threading off, under the macrobending state; Hook-shaped engagement has guaranteed again to be threaded and has been difficult for threading off and connection stability, so just makes the mechanical performance of threaded connector identical with body.

Through circular arc chamfering 2 transition, the chamfer radius R of this circular arc chamfering 2 is less than 0.5mm between the tooth top of spigot surface and said thread.

Tooth top circular arc chamfering 2 its effects of screw thread spigot surface are the chamferings of drawing when being threaded into, the size of circular arc chamfering 2, and whether affect when screwing in when being threaded make-up convenient; Big circular arc chamfering 2 angles, it is convenient to be threaded into make-up when using at the scene, simple to operate; Greatly shortened the time of operation; But excessive circular arc chamfering 2 can cause the reduction of the intensity that is threaded again, particularly increases suddenly in the pipe internal pressure, manages simultaneously when the macrobending state and very easily threads off; And the position of threading off generally all occurs in the deep of well, and the loss that causes like this is just very big.The chamfer radius R of the circular arc chamfering 2 of the utility model is controlled at less than 0.5mm; The angle of this circular arc; Use through reality, resulting technical data shows that this arc angle can both guarantee the easy of button; Guarantee that again the pipe internal pressure increases the Shi Buhui dropout suddenly under the macrobending state, make the reliability of threaded connector obtain very big assurance.

The angle 3 of spigot surface and thread axis vertical line is 10 °.

The effect of spigot surface is screw thread plays guiding in the screw-in process effect; Whether the size of the angle of spigot surface and axis of thread vertical line directly influence screws in convenient and whether situation such as dropout can take place in the screw-in process; If this angle is excessive; Can influence the bonding strength of threaded connector, reduce the auxiliary gas sealing ability of threaded connector.The angle 3 of spigot surface of the utility model and thread axis vertical line is 10 °; Detect explanation through actual the use; The employing of this angle can guarantee the stationarity that is threaded into, is difficult for again threading off, and can also play the effect of assisting hermetic seal simultaneously; The dependability of threaded connector has been guaranteed in the employing of this angle.

The tooth depth H of thread is 0.98～1.02mm, and its transverse tooth thickness T is 2.1mm～2.15mm.

In the design of special thread; Tooth depth is the data of a key; Reasonably tooth depth double thread integral intensity has very significant effects; The screw thread tooth depth H of the utility model is 0.98～1.02mm, and such tooth depth can guarantee that the intensity of threaded integral reaches optimum value, and transverse tooth thickness T is 2.10mm～2.15mm.

The tapering Q of thread is 1.788 °, and the pitch L of thread is 4.233mm.

Claims

1. the helicitic texture of an air-tight seal screw joint comprises thread, and the both sides of thread are respectively spigot surface and negative angle bearing surface, it is characterized in that: the angle of said negative angle bearing surface (1) is-3 °～-5 °.

2. the helicitic texture of a kind of air-tight seal screw joint as claimed in claim 1 is characterized in that: through circular arc chamfering (2) transition, the chamfer radius R of this circular arc chamfering (2) is less than 0.5mm between the tooth top of said spigot surface and said thread.

3. the helicitic texture of a kind of air-tight seal screw joint as claimed in claim 1, it is characterized in that: the angle (3) of said spigot surface and said thread axis vertical line is 10 °.

4. the helicitic texture of a kind of air-tight seal screw joint as claimed in claim 1, it is characterized in that: the tooth depth of said thread (H) is 0.98～1.02mm, its transverse tooth thickness (T) is 2.1mm～2.15mm.

5. the helicitic texture of a kind of air-tight seal screw joint as claimed in claim 1, it is characterized in that: the tapering of said thread (Q) is 1.788 °.

6. the helicitic texture of a kind of air-tight seal screw joint as claimed in claim 1 is characterized in that: the pitch of said thread (L) is 4.233mm.