CN202000916U

CN202000916U - Offset-thread oil casing with anti-torque shoulder

Info

Publication number: CN202000916U
Application number: CN2011201240625U
Authority: CN
Inventors: 张婷; 穆增利; 耿文亮; 张强
Original assignee: DALIPAL PIPE Co
Current assignee: DALIPAL PIPE Co
Priority date: 2011-04-25
Filing date: 2011-04-25
Publication date: 2011-10-05
Anticipated expiration: 2021-04-25

Abstract

The utility model relates to an offset-thread oil casing with an anti-torque shoulder, in particular to an oil casing thread connection structure component, which comprises a coupling for connecting a casing body. An internal thread of the coupling is connected with an external thread of the casing body through an offset thread, the coupling is matched with the end of the casing body in a conical surface to conical surface sealing manner, and the anti-torque shoulder is arranged in the middle of the coupling and presses the end of the casing body tightly. Through size design in thread form of the offset thread connection structure, the thickness of residual wall is increased, and the connection intensity of the offset thread is higher than that of the standard round thread. According to the design of the offset thread form, namely the design that the round thread is offset to one side, the angle of a bearing surface is far smaller than the angle of a guide surface, so that anti-slipping performance of the offset thread is excellent. The oil casing is provided with the offset thread, and thread form of the offset thread has better sealing performance. Further, the anti-torque shoulder with higher strength is added in the coupling to assist in sealing and can resist higher torque during descent process.

Description

Only turn round the inclined to one side round thread tubing and casing of shoulder

Technical field

The utility model relates to a kind of inclined to one side round thread tubing and casing of shoulder, particularly a kind of oil casing threaded connection structure parts only turned round.

Background technology

The connecting thread of existing oil casing threaded connection structure mostly is the standard round screw thread, reason owing to tapering and tooth depth, wall thickness to pipe has certain requirement, as oil field 73 * 5.51mm oil pipe commonly used, for increasing pipe end wall thickness and the assurance intensity that is threaded, the way of taking the two ends pier slightly to thicken with regard to having to satisfies the processing of 8 tooth round threads, and the plain end oil well pipe of the thick thickening of pier just can only not processed 10 tooth round threads, and its bonding strength greatly reduces.The sleeve pipe of 139.7 * 6.20mm then can only be processed into the short round thread of low grade of steel because wall thickness is less for another example.

The utility model content

The utility model technical issues that need to address provide a kind of inclined to one side round thread tubing and casing of shoulder of only turning round, and by the design to its connecting thread, make product have good sealing property and higher bonding strength, lower manufacturing cost simultaneously.

For solving the problems of the technologies described above, the technical scheme that the utility model adopted is: comprise the box cupling that connects body, it is characterized in that: the box cupling internal thread is connected by inclined to one side round thread with the body external screw thread, it is the conical surface-conical surface seal that box cupling and body end cooperate, the middle part of box cupling has one only to turn round shoulder, only turns round shoulder and compresses the body end.

Further improvement of the utility model is:

The tooth form angle of described inclined to one side round thread is 60 °, and the tooth form deflection is provided with, and 6-10 ° at bearing surface inclination angle, spigot surface inclination angle are 50-54 °, per inch 7 teeth.

Because the technological progress of having adopted technique scheme, the utility model to obtain is:

Connecting thread tooth form size design of the present utility model has increased residual wall thickness, and is bigger than the standard round intensity that is threaded; Again because the design that this kind tooth form is justified partially, i.e. round thread secundly, the angle that makes bearing surface is much smaller than the spigot surface angle, so its anti-slip performance is good; Box cupling and body end cooperate for the conical surface-conical surface seal, have greatly strengthened sealing performance, and this overall structure is again inclined to one side round thread, and its tooth form also has the better seal performance; Simultaneously increased in the box cupling intensity higher only turn round the effect that shoulder also plays auxiliary seal, and in the process of going into the well, only turn round shoulder and can resist bigger moment of torsion.

Description of drawings

Fig. 1 only turns round the inclined to one side round thread tubing and casing of shoulder structural representation.

Wherein: 1, box cupling, 2, body, 3, only turn round shoulder.

The specific embodiment

Below in conjunction with accompanying drawing the utility model is described in further details:

Shown in Figure 1, the utility model comprises box cupling 1 and body 2, box cupling 1 internal thread is connected by inclined to one side round thread with body 2 external screw threads, it is the conical surface-conical surface seal that box cupling 1 and body 2 ends cooperate, the middle part of box cupling 1 has one only to turn round shoulder 3, only turns round the end that shoulder 3 props up body 2, plays the assistant metal sealing function, in the process of going into the well, only turn round shoulder and can resist bigger moment of torsion.

Tooth form: keep 60 ° of tooth form angles, bearing surface is taked 6-10 ° of inclination angle, and the spigot surface inclination angle is

50-54 °, the knuckle at the bottom of tooth top and the tooth is 0.4318mm and 0.508mm.Box cupling and body end are the cone match of 1:12, and only turning round shoulder is column, plays the effect of metal to metal seal.

The bearing surface inclination angle can be designed to 6 ° of angles, and then the spigot surface inclination angle is 54 ° of angles.

The bearing surface inclination angle can be designed to 10 ° of angles, and then the spigot surface inclination angle is 50 ° of angles.

The bearing surface inclination angle can be designed to 8 ° of angles, and then the spigot surface inclination angle is 52 ° of angles.

Pitch: per inch 7 teeth.

Tapering: retention criteria tapering 1:16, can consider 1:12 more than 16 cun.

6-10 ° of inclination angle of round thread tooth form bearing surface tooth form has auto-lock function partially;

Round thread is designed to per inch 7 pitch threads partially, and the tooth root joint face is bigger, and bonding strength is good; On the other hand, because the tooth depth of this tooth form is low, residual wall thickness is big, has also increased bonding strength;

Under the effect of tensile load, because bearing surface tooth form angle is less, so it is corresponding bigger to decompose the stress of axial direction, so its anti-slip better performances.

And this tooth form is incorporated into the advantage of buttress thread and round thread together, forms a kind of screw thread with excellent sealing and higher bonding strength, not only can omit pier and slightly thicken operation, reduces cost, and good using value is also arranged.

Since the conical surface-conical surface seal of box cupling and body end, good seal performance;

Increase the higher shoulder 3 of only turning round of intensity in the box cupling and also played the effect that assistant metal seals.

Bonding strength and anti-slip performance are good.

Claims

1. only turn round the inclined to one side round thread tubing and casing of shoulder, comprise the box cupling that connects body, it is characterized in that: the box cupling internal thread is connected by inclined to one side round thread with the body external screw thread, and it is the conical surface-conical surface seal that box cupling and body end cooperate, the middle part of box cupling has one only to turn round shoulder, only turns round shoulder and compresses the body end.

2. the inclined to one side round thread tubing and casing of shoulder of only turning round according to claim 1, it is characterized in that: the tooth form angle of described inclined to one side round thread is 60 °, and the tooth form deflection is provided with, and 6-10 ° at bearing surface inclination angle, spigot surface inclination angle are 50-54 °, per inch 7 teeth.