CN211038570U

CN211038570U - Sealing ring for petroleum wellhead and wellhead device

Info

Publication number: CN211038570U
Application number: CN201921996316.5U
Authority: CN
Inventors: 李海庆; 薛庆华; 于广海; 程贵华; 侯祖刚
Original assignee: Dezhou United Petroleum Technology Corp
Current assignee: Dezhou United Petroleum Technology Corp
Priority date: 2019-11-19
Filing date: 2019-11-19
Publication date: 2020-07-17
Anticipated expiration: 2029-11-19

Abstract

A sealing ring for an oil wellhead is used for sealing connection between a casing head shell and a casing. The sealing ring comprises a polytetrafluoroethylene ring and an annular sealing ring body, wherein at least one end of an inner hole of the sealing ring body is provided with an annular accommodating groove for accommodating the polytetrafluoroethylene ring, and the polytetrafluoroethylene ring is fixed in the accommodating groove. Above-mentioned polytetrafluoroethylene ring can replace the spring rubber support skeleton among the prior art to can avoid the spring rubber support skeleton to deviate from the sealing washer, improve the yield, in addition, the utility model discloses a sealing washer also has higher high temperature resistance and high reliability.

Description

Sealing ring for petroleum wellhead and wellhead device

Technical Field

The utility model relates to a well head sealing member technical field, a sealing washer and wellhead assembly for oil well head.

Background

Fig. 1 shows a seal ring 3 ' for wellhead, and spring rubber supporting frameworks 301 ' are arranged at the positions close to inner holes at the two ends of the seal ring 3 '. The spring rubber supporting framework 301 ' is vulcanized in the sealing ring 3 ' by adopting a secondary vulcanization process, and the sealing ring 3 ' has the advantages that the spring rubber supporting framework 301 ' is easy to separate from the sealing ring 3 ', so that the manufacturing yield is low.

SUMMERY OF THE UTILITY MODEL

The utility model discloses above-mentioned technical problem to exist among the prior art provides a sealing washer and wellhead assembly for oil well head, uses the polytetrafluoroethylene ring to replace spring rubber supporting framework to can avoid spring rubber supporting framework to deviate from the sealing washer, improve the yield.

In order to realize the technical purpose, one aspect of the embodiment of the utility model provides a sealing washer for oil well head, including polytetrafluoroethylene ring sum annular sealing washer body, the at least one end of sealing washer body hole has and holds the annular holding tank of polytetrafluoroethylene ring, the polytetrafluoroethylene ring is fixed in the holding tank.

Preferably, both ends of the inner hole of the sealing ring body are provided with annular accommodating grooves for accommodating the polytetrafluoroethylene rings.

Preferably, the polytetrafluoroethylene ring and the sealing ring body are vulcanized into a whole.

Preferably, the polytetrafluoroethylene ring has a rectangular cross-section.

Another aspect of the embodiments of the present invention provides a wellhead assembly, including: the surface of an inner hole of the casing head shell is provided with at least one annular groove; and the sealing ring of any one of the above technical schemes is positioned in the annular groove.

The embodiment of the utility model provides an in one or more technical scheme, following technological effect or advantage have at least: the polytetrafluoroethylene ring can replace a spring rubber supporting framework in the prior art, so that the spring rubber supporting framework can be prevented from being separated from the sealing ring, and the yield is improved. Additionally, the utility model discloses a sealing washer also has higher high temperature resistance and high reliability.

Drawings

Fig. 1 is a schematic cross-sectional view of a seal ring for a wellhead in the prior art.

Fig. 2 is a schematic cross-sectional view of a seal ring according to an embodiment of the present invention.

Fig. 3 is the utility model relates to a seal ring of embodiment is applied to wellhead assembly's schematic structure diagram.

Fig. 4 is a partial enlarged view a in fig. 3.

Description of the reference numerals

1-casing head shell, 101-annular groove, 102-injection molding hole; 2-sleeve, 3-sealing ring, 301-polytetrafluoroethylene ring, 302-T-shaped groove, 303-protrusion and 304-accommodating groove.

Detailed Description

Other objects and advantages of the present invention will become apparent from the following explanation of the preferred embodiments of the present application.

Example 1

Fig. 2 exemplarily shows the utility model relates to a sealing washer 3 for oil well head, and this sealing washer 3 is used for the sealing connection between casing head casing 1 and sleeve pipe 2.

This sealing washer 3 includes polytetrafluoroethylene ring 301 and annular sealing washer body, and at least one end of sealing washer body hole has the annular holding tank 304 that holds polytetrafluoroethylene ring 301, and polytetrafluoroethylene ring 301 is fixed in holding tank 304. The shape of the receiving groove 304 matches the cross-sectional shape of the polytetrafluoroethylene ring 301, and after the polytetrafluoroethylene ring 301 is fixed in the receiving groove 304, one end face of the polytetrafluoroethylene ring 301 is formed as the end face of the seal ring 3, and the inner hole of the polytetrafluoroethylene ring 301 is smoothly connected with the inner hole of the seal ring 3. Preferably, the teflon ring 301 can be vulcanized integrally with the sealing ring 3.

The polytetrafluoroethylene ring 301 can replace a spring rubber supporting framework in the prior art, so that the spring rubber supporting framework can be prevented from being separated from the sealing ring 3, and the yield is improved.

In a preferred embodiment, both ends of the inner hole of the sealing ring body are provided with annular accommodating grooves 304 for accommodating the polytetrafluoroethylene rings 301.

In this embodiment, the polytetrafluoroethylene ring 301 has a rectangular cross section, but the cross section of the polytetrafluoroethylene ring 301 may be designed into other shapes as needed.

The outer circle surface of the sealing ring 3 is provided with an annular T-shaped groove 302. The surface of the inner hole of the sealing ring 3 is provided with two annular protrusions 303 which are arranged at intervals and protrude towards the center direction of the inner hole of the sealing ring 3.

Example 2

Referring to fig. 3 and 4, a wellhead assembly comprises a casing head housing 1 and a casing 2, wherein the inner bore surface of the casing head housing 1 is provided with at least one annular groove 101 and a seal ring 3 is arranged in the annular groove 101. The teflon ring 301 is in direct contact with the gap between the casing head housing 1 and the casing 2. The utility model discloses a be equipped with the hole 102 of moulding plastics that is linked together with T type groove 302 on the lateral wall of casing head casing 1, mould plastics to the T type groove 302 of sealing washer 3 through the hole 102 of moulding plastics, when the pressure extrusion sealing washer 3 that moulds plastics, polytetrafluoroethylene ring 301 can shutoff casing head casing 1 and the gap between the sleeve pipe 2 to the annular space can be sealed reliably.

In addition, the polytetrafluoroethylene ring 301 has high reliability and high temperature resistance, and accordingly, the reliability and the high temperature resistance of the sealing ring 3 are improved.

It should be noted that the sealing ring 3 of the present invention is improved based on the BT sealing ring 3, but the principle covers other injection molding sealing, such as similar improvement based on P-shaped sealing, and is within the scope of this patent. In addition, similar improvements based on other types of energized SFS seals 3, such as spring energized, are also within the scope of this patent.

In this embodiment, the cross-sectional shape of the ptfe ring 301 is rectangular, but the invention is not limited thereto, and any other cross-sectional shape of the ptfe seal ring 3 is within the scope of the present invention.

The apparatus of the present application has been described in detail with reference to the preferred embodiments thereof, however, it should be noted that those skilled in the art can make modifications, alterations and adaptations based on the above disclosure without departing from the spirit of the present application. The present application includes the specific embodiments described above and any equivalents thereof.

Claims

1. The utility model provides a sealing washer for oil well head which characterized in that, includes polytetrafluoroethylene ring sum annular sealing washer body, the at least one end of sealing washer body hole has the holding polytetrafluoroethylene ring's annular holding tank, polytetrafluoroethylene ring fixes in the holding tank.

2. The seal ring of claim 1, wherein both ends of the inner bore of the seal ring body are provided with annular receiving grooves for receiving the polytetrafluoroethylene ring.

3. The seal ring of claim 2, wherein the polytetrafluoroethylene ring is vulcanized to the seal ring body.

4. The seal ring of claim 1, wherein the polytetrafluoroethylene ring has a rectangular cross-section.

5. A wellhead assembly, comprising:

The surface of an inner hole of the casing head shell is provided with at least one annular groove;

A seal ring as claimed in any one of claims 1 to 4 located in the annular groove.