CN2332807Y

CN2332807Y - High pressure sealing joint

Info

Publication number: CN2332807Y
Application number: CN 98202134
Authority: CN
Inventors: 杜晓瑞
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-03-13
Filing date: 1998-03-13
Publication date: 1999-08-11
Anticipated expiration: 2008-03-13

Abstract

The utility model relates to a high pressure sealing joint. The high pressure sealing joint is formed by that a pipe column for installing an O-shaped sealing ring is added at the upper end of an inner buckle on the basis of step sealing and the connection of the existing inner buckle and the existing outer buckle; the corresponding region at the lower end of an outer buckle is processed into a sealing section with higher smoothness. A check ring for the O-shaped ring is added at the position of the original stress groove at the upper end of the inner buckle according to the requirement of sealing to form a new sealing ring. Therefore, O-shaped seal at the upper and the lower ends of the inner buckle is formed. Plus the existing step sealing, three sealing places can cause the sealing ability to be raised from 20 MPa to more than 40 MPa.

Description

A kind of high pressure sealing joint

The utility model relates to a kind of high pressure sealing joint, is particularly suitable for the connection of drilling well tubing string.

In petroleum drilling engineering, require pipeline to have higher resistance to pressure and energy transfer torque, and currently used line seal mode is to utilize taper slightly to link to connect drilling tool, it mainly is to utilize shoulder to compress to bear liquid seal, thereby strict to the width of shoulder and plane and lashing force, there is deficiency will cause thorn to leak slightly and the scrapping too early of drilling tool, the repair amount is big, and drilling parameter can not strengthen, and makes that drilling period is long, cost raises.

The purpose of this utility model is exactly the shortcoming that overcomes the conventional tube sealing means, and a kind of novel well casing column joint is provided.

The purpose of this utility model is achieved in that the well casing column joint is made up of taper male and female joint, O RunddichtringO, back-up ring, front end in male joint tapered thread has the straight-run of pipe post, a socket that is complementary with male joint straight tube post is arranged in female joint tapered thread lower end, in the groove of the upper end of male joint, O RunddichtringO and back-up ring are housed, on the straight tube post of male joint, are with the O RunddichtringO.

The utility model has increased straight-run of pipe post and back-up ring on the basis of existing joint, improved the sealability of tubing string, has prolonged drilling tool application life, has improved drilling condition, has strengthened drilling parameter, has reduced drilling cost.

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

Fig. 1: well casing column joint structural representation;

Among the figure: 1-male joint, 2-back-up ring, 3-O RunddichtringO, 4-female joint;

The well casing column joint is existing public, on the basis that box connects and step seals, upper end in male joint 1 increases by one section tubing string that is used to adorn O RunddichtringO 3, corresponding site in the conical internal thread lower end of female joint 4 is processed into the higher seal section of fineness, as shown in Figure 1, on the position of the original stress groove in male joint 1 upper end, add O RunddichtringO back-up ring 2 according to the sealing needs, form new joint ring one, form the O type sealing of pin thread upper and lower side like this, add original step sealing, three seals can make sealability be brought up to more than the 40MPa by 20MPa.

Claims

1, a kind of high pressure sealing joint is made up of taper male joint (1), female joint (4), O RunddichtringO (3), it is characterized in that: the front end in male joint (1) tapered thread has the straight-run of pipe post, one section socket that is complementary with male joint (1) straight tube post is arranged in female joint (4) tapered thread lower end, O RunddichtringO (3) and back-up ring (2) are housed in the upper end groove of male joint (1), on its straight tube post, are with O RunddichtringO (3).