CN218953275U

CN218953275U - Sealing structure for wellhead hanger

Info

Publication number: CN218953275U
Application number: CN202223420823.9U
Authority: CN
Inventors: 阮必春; 秦汉
Original assignee: Jiangsu Oruid Petroleum Machinery Co ltd
Current assignee: Jiangsu Oruid Petroleum Machinery Co ltd
Priority date: 2022-12-16
Filing date: 2022-12-16
Publication date: 2023-05-02
Anticipated expiration: 2032-12-16

Abstract

The utility model relates to the technical field related to wellhead hanger installation, in particular to a sealing structure for a wellhead hanger, which comprises a first sealing flange, a second sealing flange and a sealing gasket, wherein the first sealing flange is fixedly connected with a first pipeline, and a first-stage installation hole is formed in the first sealing flange in a penetrating manner; through setting up the seal structure for the well head hanger that comprises first seal ring flange, second seal ring flange and sealing washer combination to through seting up one-level seal groove at the medial surface of first seal ring flange, and seting up the second seal groove at the medial surface of second seal ring flange, and set up sealing washer to by outer anticorrosive coating and interior elastic support body combination constitution, thereby form the supporting role to tungsten steel's outer anticorrosive coating through the supporting role of interior elastic support body, thereby can effectively improve sealing washer's whole corrosion resistance when guaranteeing sealed effect.

Description

Sealing structure for wellhead hanger

Technical Field

The utility model relates to the technical field related to wellhead hanger installation, in particular to a sealing structure for a wellhead hanger.

Background

The oil pipe hanger is a device for supporting an oil pipe column and sealing an annular space between the oil pipe and a sleeve, the sealing mode of the oil pipe hanger is that the oil pipe hanger is connected with the oil pipe and is sealed by sitting in a large four-way cone body of the oil pipe hanger by utilizing the gravity of the oil pipe, the operation is convenient, the wellhead replacement speed is high and the safety is realized, the oil pipe hanger is a mode commonly used in medium-deep wells and conventional wells, the connection modes of different parts of the conventional oil pipe hanger are flange connection, and the sealing structure between the conventional flange connection structures is a rubber gasket or a metal gasket;

however, the existing rubber sealing gasket is not sulfur-resistant and corrosion-resistant, and cannot be used for high-pressure high-sulfur working conditions, while the existing metal sealing gasket is of a combined structure although being used for special working conditions, and has the problems of inconvenient installation, inaccurate sealing compression ratio and incapability of being reused after disassembly.

Disclosure of Invention

The utility model aims to provide a sealing structure for a wellhead hanger, which solves the problems in the prior art.

In order to achieve the above purpose, the present utility model provides the following technical solutions: a sealing structure for a wellhead hanger, the sealing structure comprising:

the first sealing flange is fixedly connected with the first pipeline, a first-stage mounting hole is formed in the first sealing flange in a penetrating mode, and a first-stage sealing groove is formed in the inner side face of the first sealing flange;

the second sealing flange is fixedly connected with the second pipeline, a second-stage mounting hole is formed in the second sealing flange in a penetrating mode, and a second-stage sealing groove is formed in the inner side face of the second sealing flange;

the sealing gasket is arranged between the primary sealing groove and the secondary sealing groove and is formed by combining an outer anti-corrosion layer and an inner elastic support body;

the first-level mounting holes and the second-level mounting holes are correspondingly arranged, and the first sealing flange plate and the second sealing flange plate are positioned and fixed through bolts and nuts.

Preferably, the outer anti-corrosion layer is a tungsten steel layer, and the thickness of the outer anti-corrosion layer is two millimeters.

Preferably, the inner elastic support body is a natural rubber ring, and the outer anti-corrosion layer completely covers the inner elastic support body.

Preferably, the sealing gasket is actually installed between the secondary sealing groove and the primary sealing groove, and the whole sealing gasket is in a pressed state.

Preferably, the primary seal groove and the secondary seal groove are annular notches with semi-elliptical cross sections.

Preferably, the primary seal groove and the secondary seal groove are arranged in a plurality of channels at equal intervals, and the secondary seal groove and the primary seal groove are correspondingly arranged.

Preferably, the inner elastic support body is provided with air passages, the air passages are annular notches with circular sections, a plurality of air passages are arranged at equal intervals, and inert gas is injected into the air passages.

Compared with the prior art, the utility model has the beneficial effects that:

1. the sealing structure for the wellhead hanger is formed by combining the first sealing flange plate, the second sealing flange plate and the sealing gasket, the first-stage sealing groove is formed in the inner side surface of the first sealing flange plate, the second-stage sealing groove is formed in the inner side surface of the second sealing flange plate, and the sealing gasket is formed by combining an outer anti-corrosion layer and an inner elastic supporting body, so that the supporting effect of the inner elastic supporting body is achieved on the outer anti-corrosion layer made of tungsten steel, the sealing effect is guaranteed, and meanwhile, the integral anti-corrosion strength of the sealing gasket can be effectively improved;

2. and the air passage is formed in the inner elastic support body, so that the compression deformation effect of the inner elastic support body is effectively improved through the arrangement of the air passage, and inert gas is injected into the air passage, so that the overall rebound effect of the inner elastic support body is effectively improved.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a half cross-sectional view of the present utility model;

FIG. 3 is an enlarged schematic view of the structure shown in FIG. 2A;

fig. 4 is a half cross-sectional view of a first sealing flange of the present utility model.

In the figure: the sealing device comprises a first sealing flange plate 1, a second sealing flange plate 2, a sealing gasket 3, a first pipeline 4, a second pipeline 5, a primary mounting hole 6, a secondary mounting hole 7, a primary sealing groove 8, bolts 9, nuts 10, an outer anti-corrosion layer 11, an inner elastic support body 12 and an air passage 13.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1-4, the present utility model provides three preferred embodiments:

example 1

The utility model provides a seal structure for well head hanger, seal structure for well head hanger includes first sealing flange 1, second sealing flange 2 and sealing washer 3, first sealing flange 1 and first pipeline 4 fixed connection, first level mounting hole 6 has been seted up in the run-through on its first sealing flange 1, and first level seal groove 8 has been seted up to the medial surface of first sealing flange 1, second sealing flange 2 and second pipeline 5 fixed connection, second level mounting hole 7 has been seted up in the run-through on its second sealing flange 2, and second sealing groove has been seted up to the medial surface of second sealing flange 2, sealing washer 3 installs between first level seal groove 8 and second sealing groove, and sealing washer 3 comprises outer anticorrosive coating 11 and interior elastic support body 12 combination, first level mounting hole 6 corresponds the setting with second level mounting hole 7, and fix a position fixedly through bolt 9 and nut 10 between first sealing flange 1, the second sealing flange 2.

The outer anti-corrosion layer 11 is a tungsten steel layer, the thickness of the outer anti-corrosion layer 11 is two millimeters, the inner elastic support body 12 is a natural rubber ring, and the outer anti-corrosion layer 11 completely covers the inner elastic support body 12.

The sealing gasket 3 is actually installed between the secondary sealing groove and the primary sealing groove 8, the whole sealing gasket 3 is in a pressed state, a sealing structure for a wellhead hanger is formed by combining the first sealing flange plate 1, the second sealing flange plate 2 and the sealing gasket 3, the primary sealing groove 8 is formed on the inner side surface of the first sealing flange plate 1, the secondary sealing groove is formed on the inner side surface of the second sealing flange plate 2, the sealing gasket 3 is formed by combining an outer anti-corrosion layer 11 and an inner elastic support body 12, and accordingly the supporting effect is formed on the outer anti-corrosion layer 11 made of tungsten steel through the supporting effect of the inner elastic support body 12, and the whole corrosion resistance strength of the sealing gasket 3 can be effectively improved while the sealing effect is ensured.

Example two

On the basis of the first embodiment, the first-stage sealing groove 8 and the second-stage sealing groove are annular grooves with semi-elliptical cross sections, so that the extrusion laminating effect of the sealing gasket 3 and the side walls of the grooves is improved.

The primary seal groove 8 and the secondary seal groove are arranged in a plurality of ways at equal intervals, and the secondary seal groove is arranged corresponding to the primary seal groove 8.

Example III

On the basis of the second embodiment, the air passage 13 is formed in the inner elastic support body 12, the air passage 13 is an annular notch with a circular cross section, a plurality of air passages 13 are arranged at equal intervals, inert gas is injected into the air passages 13, and the air passage 13 is formed in the inner elastic support body 12, so that the compression deformation effect of the inner elastic support body 12 is effectively improved through the arrangement of the air passage 13, and the inert gas is injected into the air passages 13, so that the overall rebound effect of the inner elastic support body 12 is effectively improved.

While the foregoing has been described in terms of illustrative embodiments thereof, so that those skilled in the art may appreciate the present application, it is not intended to be limited to the precise embodiments so that others skilled in the art may readily utilize the present application to its various modifications and variations which are within the spirit and scope of the present application as defined and determined by the appended claims.

Claims

1. A sealing structure for a wellhead hanger, which is characterized in that: the sealing structure for the wellhead hanger comprises:

the first sealing flange plate (1), the first sealing flange plate (1) is fixedly connected with the first pipeline (4), a first-stage mounting hole (6) is formed in the first sealing flange plate (1) in a penetrating mode, and a first-stage sealing groove (8) is formed in the inner side face of the first sealing flange plate (1);

the second sealing flange plate (2), the second sealing flange plate (2) is fixedly connected with the second pipeline (5), a second-stage mounting hole (7) is formed in the second sealing flange plate (2) in a penetrating mode, and a second-stage sealing groove is formed in the inner side face of the second sealing flange plate (2);

the sealing gasket (3) is arranged between the primary sealing groove (8) and the secondary sealing groove, and the sealing gasket (3) is formed by combining an outer anti-corrosion layer (11) and an inner elastic support body (12);

the first-stage mounting holes (6) and the second-stage mounting holes (7) are correspondingly arranged, and the first sealing flange plate (1) and the second sealing flange plate (2) are positioned and fixed through bolts (9) and nuts (10).

2. A sealing structure for a wellhead hanger according to claim 1, wherein: the outer anti-corrosion layer (11) is a tungsten steel layer, and the thickness of the outer anti-corrosion layer (11) is two millimeters.

3. A sealing structure for a wellhead hanger according to claim 2, wherein: the inner elastic support body (12) is a natural rubber ring, and the outer anti-corrosion layer (11) completely covers the inner elastic support body (12).

4. A seal structure for a wellhead hanger as claimed in claim 3 wherein: the sealing gasket (3) is actually arranged between the secondary sealing groove and the primary sealing groove (8), and the whole sealing gasket (3) is in a pressed state.

5. The sealing structure for a wellhead hanger according to claim 4, wherein: the primary seal groove (8) and the secondary seal groove are annular notches with semi-elliptical cross sections.

6. The sealing structure for a wellhead hanger according to claim 5, wherein: the primary seal groove (8) and the secondary seal groove are arranged in a plurality of channels at equal intervals, and the secondary seal groove and the primary seal groove (8) are correspondingly arranged.

7. The sealing structure for a wellhead hanger according to claim 6, wherein: the inner elastic support body (12) is provided with an air passage (13), the air passage (13) is an annular notch with a circular section, the air passages (13) are equidistantly provided with a plurality of channels, and inert gas is injected into the air passages (13).