A new type of graphite seal hanger for thermal recovery wellhead

Abstract

The present invention provides a novel graphite sealing hanger for a thermal recovery wellhead, and relates to the technical field of thermal recovery wellhead sealing structures, comprising a hanger body, a metal gasket is arranged on the upper part of the hanger body, a graphite seal is arranged on the upper part of the hanger body, an indicator strip is pasted on the surface of the metal gasket, a label is pasted on the surface of the graphite seal, there are two groups of the metal gaskets, the two groups of the metal gaskets are respectively located at the top and the bottom of the graphite seal, convex particles are arranged on the surface of the metal gasket, the metal gasket is used as a support, and the graphite seal is used as a sealing body. Firstly, the installation and positioning of the graphite sealing structure are accurate, the installation is convenient, and the sealing effect can be better guaranteed. By analyzing the pressure borne by the upper part of the hanger body and combining the characteristics of graphite deformation under stress, the sealing of the upper part of the hanger body is achieved. Secondly, the graphite seal is simpler than the original sealing structure, the processing accuracy is relatively low, and the cost can be saved.

Description

Technical Field

[0001] The invention relates to the technical field of thermal recovery wellhead sealing structures, and in particular to a novel graphite sealing hanger for thermal recovery wellheads. Background Art

[0002] Thermal wellheads usually refer to wellhead equipment used for high-temperature oil and gas production. They need to have characteristics such as high temperature resistance, high pressure resistance and corrosion resistance. Since thermal wellheads need to handle high-temperature fluids, sealing technology is particularly important. The traditional sealing structure is a metal sealing structure. The upper part of the hanger has sealing surfaces inside and outside, and the sealing surface of the upper flange and the metal seal is a stepped sealing surface, which requires relatively high processing accuracy. At the same time, metal seals are difficult to position during installation, and the sealing effect will be poor during use due to inaccurate positioning.

[0003] Therefore, a new graphite seal hanger for thermal recovery wellhead is designed to solve the above problems. Summary of the invention

[0004] The purpose of the invention is to provide a hanger upper sealing structure which is convenient to install and position, simple to process and has better sealing effect.

[0005] The present invention adopts the following technical scheme: a new type of graphite sealing hanger for thermal recovery wellhead, comprising a hanger body, a metal gasket is arranged on the upper part of the hanger body, a graphite seal is arranged on the upper part of the hanger body, an indicator strip is pasted on the surface of the metal gasket, a label is pasted on the surface of the graphite seal, there are two groups of metal gaskets, the two groups of metal gaskets are respectively located at the top and bottom of the graphite seal, and the surface of the metal gasket is provided with convex particles.

[0006] As a preferred novel graphite seal hanger for thermal recovery wellhead of the present invention, the graphite seal is V-shaped.

[0007] As a preferred novel graphite sealing hanger for thermal recovery wellhead of the present invention, the indicator strip on the surface of the metal gasket corresponds to the position of the label on the surface of the graphite seal, and the indicator strip and the label can form a coherent whole.

[0008] As a preferred new graphite sealing hanger for thermal recovery wellhead of the present invention, the hanger body is installed in the tubing head spool, and the hanger body and the tubing head spool are fixed by an upper flange.

[0009] As a preferred embodiment of the novel graphite sealing hanger for thermal recovery wellhead of the present invention, the upper flange is connected to the tubing head cross by bolts.

[0010] As a preferred novel graphite seal hanger for thermal recovery wellhead of the present invention, the inner sealing surface of the upper flange is in contact with the graphite seal.

[0011] As a preferred novel graphite sealing hanger for thermal recovery wellhead of the present invention, the material of the protrusion is organic silica gel, and the shape of the protrusion is hemispherical.

[0012] As a preferred embodiment of the novel graphite sealing hanger for thermal recovery wellhead of the present invention, the protrusions are distributed in a circular array on the surface of the metal gasket.

[0013] As a preferred novel graphite seal hanger for thermal recovery wellhead of the present invention, the surface of the protrusion is in contact with the surface of the graphite seal.

[0014] As a preferred novel graphite sealing hanger for thermal recovery wellhead of the present invention, the surfaces of the hanger body and the metal gasket are coated with silicone coating.

[0015] Compared with the prior art, the advantages and positive effects of the present invention are:

[0016] 1. In the present invention, a metal gasket is used as a support and a graphite seal is used as a sealing body. Firstly, the installation and positioning of the graphite seal structure is accurate and convenient, and the graphite seal can be infinitely squeezed, which can better ensure the sealing effect. By analyzing the pressure borne by the upper part of the hanger body and combining the characteristics of graphite deformation under stress, the sealing of the upper part of the hanger body is achieved. Secondly, the graphite seal is simpler than the original sealing structure, and the processing accuracy is relatively low, which can save costs.

[0017] 2. In the present invention, by setting labels and indicator strips, when the sealing state changes, the indicator strip will be misaligned with the label accordingly, providing instant visual feedback, which is convenient for on-site operators to quickly judge the sealing state. Convex particles are also provided to reduce the tiny gap between the metal gasket and the graphite seal, thereby improving the sealing effect of the upper part of the hanger body. Silicone coating is also coated on the surface of the metal gasket and the hanger body, which can extend the service life of the metal gasket and the hanger body to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The present invention provides a schematic structural diagram of the installation and use of a new graphite sealing hanger for thermal recovery wellheads;

[0019] Figure 2 The present invention proposes a specific implementation structure schematic diagram of a new graphite sealing hanger for thermal recovery wellhead;

[0020] Figure 3 A partial schematic diagram of a novel graphite seal hanger for thermal recovery wellhead proposed by the present invention;

[0021] Figure 4 A top view of a metal gasket of a novel graphite sealing hanger for a thermal recovery wellhead proposed by the present invention;

[0022] Figure 5 Schematic diagram of traditional sealing structure.

[0023] Legend:

[0024] 1. Hanger body; 2. Metal gasket; 3. Graphite seal; 4. Indicator strip; 5. Label; 6. Bump; 7. Metal seal; 8. Upper flange; 9. Oil pipe head cross; 10. Bolts. DETAILED DESCRIPTION

[0025] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0026] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.

[0027] Example

[0028] See also Figure 1-Figure 5The present invention provides a technical solution: a new graphite sealing hanger for thermal recovery wellhead, including a hanger body 1, the hanger body 1 is installed in the tubing head 4-way 9, after the upper flange 8 is installed, as the bolts 10 are tightened, the sealing surface in the upper flange 8 and the graphite sealing 3 parts are pressed together, so as to achieve a sealing effect, the hanger body 1 and the tubing head 4-way 9 are fixed by the upper flange 8, ensuring the stability and durability of the hanger body 1 under high pressure environment, the flange connection has good sealing performance and high strength, and is suitable for occasions that require frequent disassembly and cleaning, the upper flange 8 and the tubing head 4-way 9 are connected by bolts 10, and the upper part of the hanger body 1 is provided with a metal Gasket 2, the surfaces of the hanger body 1 and the metal gasket 2 are coated with silicone coating. The metal gasket 2 is used as a support and is coated with silicone coating to improve corrosion resistance and reduce friction. The metal gasket 2 can be made of stainless steel or titanium alloy. These materials have excellent corrosion resistance and good mechanical strength. A graphite seal 3 is arranged on the upper part of the hanger body 1. The graphite seal 3 serves as a sealing body and uses the metal gasket 2 as a support. By analyzing the pressure on the upper part of the hanger body 1 and combining the characteristics of graphite deformation under stress, the sealing of the upper part of the hanger body 1 is achieved. The graphite seal 3 is V-shaped, which provides better compressibility and adaptability for the seal and can be adjusted according to the pressure. The shape of the metal gasket 2 is automatically adjusted by force to achieve the best sealing effect. An indicator strip 4 is attached to the surface of the metal gasket 2, and a label 5 is attached to the surface of the graphite seal 3. The indicator strip 4 on the surface of the metal gasket 2 corresponds to the position of the label 5 on the surface of the graphite seal 3, and the indicator strip 4 and the label 5 can form a coherent whole. When the sealing state changes, the indicator strip 4 and the label 5 will be misaligned accordingly, providing instant visual feedback. This design enables on-site operators to quickly judge the sealing state and take maintenance measures in time. There are two groups of metal gaskets 2, and the two groups of metal gaskets 2 are respectively located at the top and bottom of the graphite seal 3. The two groups of metal gaskets 2 are mainly The graphite seal 3 is to be positioned and guided, and the sealing effect is achieved through the compression and expansion of the graphite seal 3. The graphite seal 3 is installed on the upper part of the hanger body 1, and the graphite seal 3 is compressed again by the pressing force after the oil pipe head spool 9 and the upper flange 8 are assembled. The corresponding sealing surface is set according to the deformation characteristics of the graphite seal 3, so as to achieve a safe and reliable sealing effect between the upper part of the hanger body 1 and the upper flange 8. The surface of the metal gasket 2 is provided with a convex particle 6, the material of the convex particle 6 is organic silicone, and the shape of the convex particle 6 is hemispherical. The design of the convex particle 6 can form a small gap between the metal gasket 2 and the metal gasket 2, which helps to reduce direct contact between metals, reduce wear, and improve the sealing effect.

[0029] Working principle: metal gasket 2 is used as support and graphite seal 3 is used as sealing body. When tubing head spool 9 and upper flange 8 are assembled, as bolts 10 are tightened, the pressing force between tubing head spool 9 and upper flange 8 compresses graphite seal 3. At the same time, metal gasket 2 can play a role in positioning and guiding graphite seal 3. By analyzing the pressure on the upper part of hanger body 1 and combining the characteristics of graphite deformation under stress, the compression and expansion of graphite seal 3 is used to achieve the sealing of the upper part of hanger body 1. By setting convex particles 6 on the surface of metal gasket 2, the metal gasket 2 and the upper flange 8 can be reduced. A tiny gap between the graphite seals 3 is created, thereby improving the sealing effect to a certain extent, and an indicator strip 4 and a label 5 are respectively arranged on the surface of the metal gasket 2 and the graphite seal 3. When the sealing state changes, the indicator strip 4 will be misaligned with the label 5 accordingly, providing instant visual feedback, which is convenient for on-site operators to quickly judge the sealing state. The graphite seal 3 structure is adopted, and the installation positioning is accurate and the installation is convenient. The graphite seal 3 can be infinitely squeezed, which can better ensure the sealing effect. Secondly, the graphite seal 3 is simpler than the original sealing structure, and the processing accuracy is relatively low, which can save costs.

[0030] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A novel graphite seal hanger for thermal recovery wellhead, comprising a hanger body (1), characterized in that: A metal gasket (2) is arranged on the upper part of the hanger body (1), a graphite seal (3) is arranged on the upper part of the hanger body (1), an indicator strip (4) is adhered to the surface of the metal gasket (2), a label (5) is adhered to the surface of the graphite seal (3), there are two groups of the metal gaskets (2), the two groups of the metal gaskets (2) are respectively located at the top and bottom of the graphite seal (3), and convex particles (6) are arranged on the surface of the metal gaskets (2).

2. The novel graphite seal hanger for thermal recovery wellhead according to claim 1 is characterized in that: The graphite seal (3) is V-shaped.

3. The novel graphite seal hanger for thermal recovery wellhead according to claim 2 is characterized in that: The indicator strip (4) on the surface of the metal gasket (2) corresponds to the position of the label (5) on the surface of the graphite seal (3), and the indicator strip (4) and the label (5) can form a continuous whole.

4. The novel graphite seal hanger for thermal recovery wellhead according to claim 3 is characterized in that: The hanger body (1) is installed in a tubing head spool (9), and the hanger body (1) and the tubing head spool (9) are fixed via an upper flange (8).

5. The novel graphite seal hanger for thermal recovery wellhead according to claim 4 is characterized in that: The upper flange (8) is connected to the oil pipe head cross (9) via bolts (10).

6. The novel graphite seal hanger for thermal recovery wellhead according to claim 5 is characterized in that: The inner sealing surface of the upper flange (8) is in contact with the graphite seal (3).

7. The novel graphite seal hanger for thermal recovery wellhead according to claim 6 is characterized in that: The material of the convex particle (6) is organic silica gel, and the shape of the convex particle (6) is hemispherical.

8. The novel graphite seal hanger for thermal recovery wellhead according to claim 7 is characterized in that: The protrusions (6) are distributed in a circular array on the surface of the metal gasket (2).

9. The novel graphite seal hanger for thermal recovery wellhead according to claim 8 is characterized in that: The surface of the convex particle (6) is in contact with the surface of the graphite seal (3).

10. The novel graphite seal hanger for thermal recovery wellhead according to claim 9, characterized in that: The surfaces of the hanger body (1) and the metal gasket (2) are both coated with silicone paint.

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