A valve protection structure for a wellhead Christmas tree and its installation method

Abstract

The present invention discloses a protective structure for a wellhead Christmas tree valve and an installation method thereof, and relates to the technical field of wellhead Christmas trees. The technical scheme thereof includes a wellhead Christmas tree pipe body, a wellhead Christmas tree connecting valve is arranged on the left side of the wellhead Christmas tree pipe body, a wellhead Christmas tree outer protective shell for protecting the wellhead Christmas tree pipe body and the wellhead Christmas tree connecting valve connecting part is arranged outside the wellhead Christmas tree pipe body and the wellhead Christmas tree connecting valve, a flame retardant component is arranged on the left side of the inner wall of the wellhead Christmas tree outer protective shell, and an anti-collision connector for preventing the wellhead Christmas tree outer protective shell from exploding inside is arranged on the upper and lower surfaces of the wellhead Christmas tree outer protective shell. The entire structure of the invention can be erected on the surface of the connection of the Christmas tree valve pipe body, and can also be damaged at the connection position of the wellhead Christmas tree pipe body and the wellhead Christmas tree connecting valve to form an effective protective effect, which effectively improves the invention prospect of the device.

Description

Technical Field

[0001] The invention relates to the technical field of wellhead Christmas trees, and more particularly to a valve protection structure for a wellhead Christmas tree and an installation method thereof. Background Art

[0002] The Christmas tree is a component located at the opening to the top of the oil well, including valves for measurement and maintenance, safety systems and a series of monitoring equipment. The Christmas tree connects the production pipeline and the oil flow pipe from the well, and serves as an important barrier to isolate the top of the oil well from the external environment. It includes many valves that can be used to regulate or prevent the produced crude oil vapor, natural gas and liquid from gushing out of the well. The Christmas tree is connected to the production manifold system through a submarine pipeline;

[0003] There are many types of Christmas trees. According to the application area, they are divided into above-water Christmas trees (placed on the platform deck) and underwater Christmas trees (placed on the seabed); according to the installation position, they are divided into vertical (or vertical) Christmas trees, horizontal (or horizontal) Christmas trees, and inserted (or caisson) Christmas trees; according to the structural form, they are divided into dry Christmas trees, wet Christmas trees, and dry / wet Christmas trees; according to the layout of the wells, they are divided into satellite well Christmas trees and chassis well Christmas trees;

[0004] The components of the Christmas tree mainly include tubing heads, tubing hangers, flanges and some valves. The valves mainly include nozzles (throttle valves), production wing valves, wax cleaning valves, main valves and casing valves.

[0005] When a Christmas tree leaks, usually at the connection between the valve and the oil pipe, or when the oil pressure is high, the connection will be damaged and the valve will be opened, which will not only cause danger but also cause leakage, and both the valve and the pipe will be damaged. Therefore, the present invention proposes a valve protection structure and installation method for a wellhead Christmas tree to solve the problems raised in the above background technology. Summary of the invention

[0006] In order to solve the problems raised in the above background technology, the purpose of the present invention is to provide a valve protection structure for a wellhead oil tree and an installation method thereof, which has the advantage of providing effective protection and can serve as a temporary carrier for oil leakage.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A wellhead Christmas tree valve protection structure, comprising a wellhead Christmas tree pipe body, a wellhead Christmas tree connection valve is arranged on the left side of the wellhead Christmas tree pipe body, a wellhead Christmas tree outer protection shell for protecting the wellhead Christmas tree pipe body and the wellhead Christmas tree connection valve connection part is arranged outside the wellhead Christmas tree pipe body and the wellhead Christmas tree connection valve, a flame retardant component is arranged on the left side of the inner wall of the wellhead Christmas tree outer protection shell, and an anti-impact connector for preventing the wellhead Christmas tree outer protection shell from exploding is arranged on the upper surface and the lower surface;

[0009] The outer protective shell of the wellhead oil production tree comprises a pipe body connection shell and a valve connection shell, the pipe body connection shell and the valve connection shell are engaged with each other, two connection blocks are arranged on the left side of the pipe body connection shell, the adjacent sides of the two connection blocks are engaged with the surface of the wellhead oil production tree pipe body, and the interior of the upper connection block is provided with a torsion spring for matching the outer diameter of the wellhead oil production tree pipe body.

[0010] As a further solution of the present invention: an inspection door is connected to the left side of the valve connection shell by screws, and the flame retardant component is arranged on the right side of the inspection door.

[0011] As a further solution of the present invention: contact pads are provided on opposite sides of the two connecting blocks, and the two contact pads are made of corrosion-resistant rubber material.

[0012] As a further solution of the present invention: the flame retardant assembly includes a flame retardant shell, the interior of the flame retardant shell is filled with flame retardant filler, a soft rubber sheet is arranged on the right side of the flame retardant shell, a pressure block with a needle is clamped on the right side of the flame retardant shell, and the pressure block with a needle is adhered to the left side of the wellhead oil production tree connecting valve.

[0013] As a further solution of the present invention: the flame retardant filler is filled with liquid flame retardant.

[0014] As a further solution of the present invention: the anti-impact connecting piece includes two first threaded rings and two second threaded rings, and the two groups of the first threaded rings and the second threaded rings are respectively arranged on the surfaces of the pipe body connecting shell and the valve connecting shell, and the surface of the valve connecting shell is provided with a threaded connecting rod, and the right end of the threaded connecting rod is threadedly connected to the inner walls of the two groups of the first threaded rings and the second threaded rings in turn.

[0015] As a further solution of the present invention: a foam sponge is placed on the lower surface of the inner wall of the outer protective shell of the wellhead Christmas tree.

[0016] As a further solution of the present invention: the interior of the pipe body connection shell, the valve connection shell and the inspection door are all provided with a plurality of obliquely densely arranged anti-collision support rods, and two adjacent anti-collision support rods are in a triangular shape.

[0017] As a further solution of the present invention: the interior of the pipe body connecting shell, the valve connecting shell and the inspection door is filled with moisture-proof cotton for absorbing moisture, and the moisture-proof cotton is coated on the surface of multiple anti-impact support rods.

[0018] The beneficial effects of the present invention are as follows: the entire device can effectively protect the wellhead Christmas tree pipe body, the wellhead Christmas tree connecting valve, and especially the connecting part of these two parts;

[0019] Realize daily protection: The pipe body connection shell, valve connection shell and inspection door are filled with anti-impact rods and moisture-proof cotton to prevent the surface of the wellhead tree pipe body and the wellhead tree connection valve from being impacted by other factors. In addition, moisture-proof cotton and foam sponge can be used together to absorb moisture entering from the external gap to prevent the humid environment inside the wellhead tree pipe body from corroding the wellhead tree pipe body and the wellhead tree connection valve.

[0020] To achieve emergency protection: When the pressure shock pressure inside the wellhead tree pipe reaches a value that the wellhead tree pipe and the wellhead tree connection valve cannot withstand, the connection between the wellhead tree pipe and the wellhead tree connection valve will rupture. At this time, after the wellhead tree connection valve falls, it will be caught by a foam sponge to prevent the wellhead tree connection valve from falling and being damaged. When the wellhead tree connection valve is detached, the needle-carrying block will pierce the soft rubber film, causing the liquid inside the flame-retardant filler to leak into the outer protective shell of the wellhead tree. The inside of the body is flame-retardant to prevent friction, static electricity and other more dangerous fire situations. At this time, the oil inside the wellhead tree body is poured into the inside of the wellhead tree outer protection shell. At this time, under the protection of the anti-impact connector, with the large space buffer inside the wellhead tree outer protection shell, the wellhead tree outer protection shell can be used as an effective carrier at the leakage position of the wellhead tree body and the wellhead tree connection valve, preventing the possibility of direct oil leakage caused by the breakage of the wellhead tree body and the wellhead tree connection valve;

[0021] The entire structure can be erected on the surface of the connection of the Christmas tree valve pipe body, which can not only reduce the erosion damage caused by the daily environment, but also can form an effective protection for damage at the wellhead Christmas tree pipe body and the wellhead Christmas tree connection valve connection position, effectively improving the invention prospects of the device.

[0022] As a further solution of the present invention: the installation method for the wellhead Christmas tree valve protection structure comprises the following steps:

[0023] Step (A) installs the flame retardant assembly to the corresponding position, and the process is: install the flame retardant shell on the surface of the inspection door, and stick the pressure block with a needle on the surface of the wellhead Christmas tree connection valve, and then engage the flame retardant shell with the pressure block with a needle correspondingly;

[0024] Step (B) installing the outer protective shell of the wellhead Christmas tree on the surface of the wellhead Christmas tree pipe body and the wellhead Christmas tree connecting valve, the steps include:

[0025] (Ba) After the lower connecting block is inserted into the surface of the wellhead tree body, the torsion spring drives the upper connecting block to rotate and then insert it into the surface of the wellhead tree body. The torsion spring drives the connecting block to rotate to different angles according to the outer diameter of the wellhead tree body;

[0026] (Bb) After the corresponding positions of the pipe body connection shell and the valve connection shell are engaged, the two threaded connection rods are threadedly connected in sequence according to the two adjacent groups of first thread rings and second thread rings in the order of second thread ring, first thread ring, first thread ring, and second thread ring, and then positioned;

[0027] (Bc) Connect the four corners of the inspection door to the inner wall of the valve connection shell with screws so that the flame retardant assembly rests against the left side of the wellhead Christmas tree connection valve;

[0028] (Bd) Before the pipe body connection shell and the valve connection shell are engaged, place the foam sponge inside;

[0029] Step (C) is an operation when the valve connecting the wellhead Christmas tree pipe body and the wellhead Christmas tree is opened, and the steps include:

[0030] (Ca) First, the needle-carrying block will puncture the soft film, causing the liquid inside the flame-retardant filler to leak into the flame-retardant inside the protective shell outside the wellhead oil tree;

[0031] (Cb) Under the action of gravity, the foam sponge catches the wellhead Christmas tree connection valve;

[0032] (Cc) The pipe body connection shell, valve connection shell and inspection door cooperate with the anti-impact effect of the anti-impact connector to form a temporary bearing body connected to the wellhead oil production tree pipe body.

[0033] Compared with the prior art, the beneficial effect of the installation method of the present invention is that such installation can effectively protect the connection parts, and the main body is easy to install, and can adapt to the installation of wellhead oil production tree pipes with different outer diameters, effectively improving the practicality of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0035] Figure 2 It is a front cross-sectional structural schematic diagram of the present invention;

[0036] Figure 3 It is a schematic diagram of the side cross-sectional structure of the present invention;

[0037] Figure 4 It is a partial front view cross-sectional structural schematic diagram of the pipe body connection shell of the present invention;

[0038] Figure 5 For the present invention Figure 1 The enlarged view of point A in the middle;

[0039] Figure 6 For the present invention Figure 2 Enlarged view of point B in the middle;.

[0040] In the figure: 1. Wellhead Christmas tree pipe body; 2. Wellhead Christmas tree connecting valve; 3. Wellhead Christmas tree outer protective shell; 301. Pipe body connecting shell; 302. Connecting block; 303. Contact pad; 304. Torsion spring; 305. Valve connecting shell; 306. Inspection door; 4. Flame retardant component; 401. Flame retardant shell; 402. Flame retardant filler; 403. Soft plastic sheet; 404. Needle pressure block; 5. Anti-impact connector; 501. Threaded connecting rod; 502. First threaded ring; 503. Second threaded ring; 6. Foam sponge; 801. Anti-impact support rod; 802. Moisture-proof cotton. DETAILED DESCRIPTION

[0041] The present invention will be further described in detail below with reference to the accompanying drawings.

[0042] See also Figures 1 to 6 A wellhead Christmas tree valve protection structure, comprising a wellhead Christmas tree pipe body 1, a wellhead Christmas tree connecting valve 2 is arranged on the left side of the wellhead Christmas tree pipe body 1, a wellhead Christmas tree outer protection shell 3 for protecting the connection part of the wellhead Christmas tree pipe body 1 and the wellhead Christmas tree connecting valve 2 is arranged outside the wellhead Christmas tree pipe body 1 and the wellhead Christmas tree connecting valve 2, a flame retardant component 4 is arranged on the left side of the inner wall of the wellhead Christmas tree outer protection shell 3, and an anti-impact connector 5 for preventing the wellhead Christmas tree outer protection shell 3 from exploding is arranged on the upper surface and the lower surface;

[0043] The outer protective shell 3 of the wellhead oil tree includes a pipe body connecting shell 301 and a valve connecting shell 305. The pipe body connecting shell 301 and the valve connecting shell 305 are engaged with each other. Two connecting blocks 302 are arranged on the left side of the pipe body connecting shell 301. The adjacent sides of the two connecting blocks 302 are engaged with the surface of the wellhead oil tree pipe body 1, and the upper connecting block 302 is provided inside with a torsion spring 304 for matching the outer diameter of the wellhead oil tree pipe body 1.

[0044] exist Figure 1 In the figure, the left side of the valve connecting shell 305 is connected with an inspection door 306 by screws, and the flame retardant component 4 is arranged on the right side of the inspection door 306. The inspection door 306 can be opened from the left side of the entire structure during daily maintenance, which is more convenient and quick.

[0045] exist Figure 1 In the embodiment, contact pads 303 are provided on opposite sides of the two connection blocks 302, and the two contact pads 303 are made of corrosion-resistant rubber material. The two contact pads 303 can better fit the wellhead Christmas tree pipe body 1 and reduce wear.

[0046] exist Figure 2 In the figure, the flame retardant component 4 includes a flame retardant shell 401, the interior of the flame retardant shell 401 is filled with a flame retardant filler 402, a soft rubber sheet 403 is arranged on the right side of the flame retardant shell 401, a needle pressure block 404 is engaged on the right side of the flame retardant shell 401, the needle pressure block 404 is adhered to the left side of the wellhead oil production tree connection valve 2, and the flame retardant component 4 is arranged. When the wellhead oil production tree connection valve 2 is detached, the needle pressure block 404 will be driven to pierce the soft rubber sheet 403 and release the flame retardant filler 402.

[0047] exist Figure 2 In the embodiment, the flame retardant filler 402 is filled with liquid flame retardant, and the liquid inside the flame retardant filler 402 leaks into the outer protective shell 3 of the wellhead oil production tree to retard the flame, thereby preventing more dangerous fire situations caused by friction, static electricity, etc.

[0048] exist Figure 3 In the figure, the anti-impact connecting member 5 includes two first threaded rings 502 and second threaded rings 503. The two groups of first threaded rings 502 and second threaded rings 503 are respectively arranged on the surfaces of the tube body connecting shell 301 and the valve connecting shell 305, and the surface of the valve connecting shell 305 is provided with a threaded connecting rod 501. The right end of the threaded connecting rod 501 is threadedly connected with the inner walls of the two groups of first threaded rings 502 and second threaded rings 503 in sequence. The anti-impact structure provided with the anti-impact connecting member 5 is formed by the cooperation of the two groups of first threaded rings 502 and second threaded rings 503. When impacted, the first threaded ring 502 will be broken, but at this time the second threaded ring 503 will form another layer of protection, which effectively improves the protection effect of the device.

[0049] exist Figure 4 In the figure, a foam sponge 6 is placed on the lower surface of the inner wall of the outer protective shell 3 of the wellhead oil tree. When the wellhead oil tree connecting valve 2 falls, the foam sponge 6 will be used to catch it to prevent the wellhead oil tree connecting valve 2 from falling and being damaged.

[0050] exist Figure 5 In the figure, a plurality of obliquely densely arranged anti-collision support rods 801 are arranged inside the pipe body connection shell 301, the valve connection shell 305 and the inspection door 306, and two adjacent anti-collision support rods 801 are triangular. Such an arrangement can increase the strength of the pipe body connection shell 301, the valve connection shell 305 and the inspection door 306.

[0051] exist Figure 1In the figure, the interior of the pipe body connection shell 301, the valve connection shell 305 and the inspection door 306 are filled with moisture-proof cotton 802 for absorbing moisture, and the moisture-proof cotton 802 is coated on the surface of multiple anti-impact support rods 801. The moisture-proof cotton 802 cooperates with the foam sponge 6 to absorb moisture entering from the external gaps, thereby preventing the humid environment inside the wellhead oil tree pipe body 1 from corroding the wellhead oil tree pipe body 1 and the wellhead oil tree connection valve 2.

[0052] Furthermore, there are four sets of first threaded rings 502 and second threaded rings 503, which are respectively arranged at the connection points of the upper surface and the lower surface of the pipe body connection shell 301 and the valve connection shell 305.

[0053] Beneficial effects of the present invention: the entire device can effectively protect the wellhead Christmas tree pipe body 1, the wellhead Christmas tree connecting valve 2, and especially the connection part of these two parts;

[0054] Daily protection: The pipe body connection shell 301, the valve connection shell 305 and the inspection door 306 are filled with anti-impact rods 801 and moisture-proof cotton 802, which can prevent the surface of the wellhead tree pipe body 1 and the wellhead tree connection valve 2 from being impacted by other factors, and the moisture-proof cotton 802 can cooperate with the foam sponge 6 to absorb moisture entering from the external gap, so as to prevent the wellhead tree pipe body 1 from being corroded by the humid environment generated inside the wellhead tree pipe body 1 and the wellhead tree connection valve 2;

[0055] To achieve emergency protection: When the pressure shock pressure inside the wellhead tree tube body 1 reaches a value that the wellhead tree tube body 1 and the wellhead tree connection valve 2 cannot withstand, the connection between the wellhead tree tube body 1 and the wellhead tree connection valve 2 will rupture. At this time, after the wellhead tree connection valve 2 falls, the foam sponge 6 will be used to catch it to prevent the wellhead tree connection valve 2 from falling and being damaged. When the wellhead tree connection valve 2 is detached, the needle pressure block 404 will be driven to pierce the soft rubber sheet 403, so that the liquid inside the flame retardant filler 402 will leak into the wellhead tree The inside of the outer protective shell 3 is flame retardant to prevent friction, static electricity, etc. from causing more dangerous fires. At this time, the oil inside the wellhead tree tube body 1 is poured into the inside of the wellhead tree outer protective shell 3. At this time, under the protection of the anti-collision connector 5, the wellhead tree outer protective shell 3 can be used as an effective carrier at the leakage position of the wellhead tree tube body 1 and the wellhead tree connection valve 2 to prevent the possibility of oil leakage directly caused by the breakage of the wellhead tree tube body 1 and the wellhead tree connection valve 2;

[0056] The entire structure can be erected on the surface of the connection of the Christmas tree valve pipe body, which can not only reduce the erosion damage caused by the daily environment, but also can form an effective protection effect on the damage at the connection position of the wellhead Christmas tree pipe body 1 and the wellhead Christmas tree connection valve 2, effectively improving the invention prospects of the device.

[0057] The installation method for the valve protection structure of the wellhead oil production tree comprises the following steps:

[0058] Step A, installing the flame retardant assembly 4 to the corresponding position, the process is: installing the flame retardant shell 401 on the surface of the inspection door 306, and sticking the pressure block with a needle 404 on the surface of the wellhead Christmas tree connecting valve 2, and then correspondingly engaging the flame retardant shell 401 with the pressure block with a needle 404;

[0059] Step B, installing the outer protective shell 3 of the wellhead Christmas tree on the surface of the wellhead Christmas tree pipe body 1 and the wellhead Christmas tree connecting valve 2, the steps include:

[0060] Ba. After the lower connecting block 302 is inserted into the surface of the wellhead tree body 1, the torsion spring 304 drives the upper connecting block 302 to rotate and insert it into the surface of the wellhead tree body 1. The torsion spring 304 drives the connecting block 302 to rotate to different angles according to the outer diameter of the wellhead tree body 1.

[0061] Bb, after the corresponding positions of the pipe body connection shell 301 and the valve connection shell 305 are engaged, the two threaded connecting rods 501 are threadedly connected in sequence according to the two adjacent groups of first threaded rings 502 and second threaded rings 503 in the order of second threaded ring 503, first threaded ring 502, first threaded ring 502, and second threaded ring 503, and then positioned;

[0062] Bc, connect the four corners of the inspection door 306 to the inner wall of the valve connection shell 305 with screws, so that the flame retardant component 4 is against the left side of the wellhead Christmas tree connection valve 2;

[0063] Bd. Before the pipe body connecting shell 301 and the valve connecting shell 305 are engaged, the foaming sponge 6 is placed inside;

[0064] Step C is an operation when the wellhead Christmas tree pipe body 1 and the wellhead Christmas tree connection valve 2 are opened, and the steps include:

[0065] Ca, firstly, the needle pressure block 404 will puncture the soft plastic sheet 403, so that the liquid inside the flame retardant filler 402 will leak into the outer protective shell 3 of the wellhead Christmas tree to retard the fire;

[0066] Cb, under the action of gravity, the foam sponge 6 catches the wellhead Christmas tree connection valve 2;

[0067] Cc, the pipe body connection shell 301, the valve connection shell 305 and the inspection door 306 cooperate with the anti-impact effect of the anti-impact connector 5 to form a temporary bearing body connected to the wellhead Christmas tree pipe body 1.

[0068] Compared with the prior art, the beneficial effect of the installation method of the present invention is that such installation can effectively protect the connection parts, and the main body is easy to install, and can adapt to the installation of wellhead oil production tree pipe bodies 1 with different outer diameters, effectively improving the practicality of the device.

[0069] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A valve protection structure for a wellhead Christmas tree, characterized in that: It comprises a wellhead Christmas tree tube body (1), a wellhead Christmas tree connecting valve (2) is arranged on the left side of the wellhead Christmas tree tube body (1), a wellhead Christmas tree outer protective shell (3) for protecting the connection part of the wellhead Christmas tree tube body (1) and the wellhead Christmas tree connecting valve (2) is arranged outside the wellhead Christmas tree tube body (1) and the wellhead Christmas tree connecting valve (2), a flame retardant component (4) is arranged on the left side of the inner wall of the wellhead Christmas tree outer protective shell (3), and an anti-impact connecting piece (5) for preventing the wellhead Christmas tree outer protective shell (3) from exploding is arranged on the upper surface and the lower surface of the wellhead Christmas tree outer protective shell (3); The wellhead Christmas tree outer protective shell (3) comprises a pipe body connection shell (301) and a valve connection shell (305), the pipe body connection shell (301) and the valve connection shell (305) are engaged with each other, two connection blocks (302) are arranged on the left side of the pipe body connection shell (301), the adjacent sides of the two connection blocks (302) are engaged with the surface of the wellhead Christmas tree pipe body (1), and a torsion spring (304) for matching the outer diameters of different wellhead Christmas tree pipe bodies (1) is arranged inside the upper connection block (302); The flame retardant assembly (4) comprises a flame retardant shell (401), the interior of the flame retardant shell (401) is filled with a flame retardant filler (402), a soft plastic sheet (403) is arranged on the right side of the flame retardant shell (401), a pressure block with a needle (404) is clamped on the right side of the flame retardant shell (401), and the pressure block with a needle (404) is adhered to the left side of the wellhead Christmas tree connection valve (2); The anti-collision connection piece (5) comprises two first threaded rings (502) and two second threaded rings (503), the two sets of the first threaded rings (502) and the second threaded rings (503) being respectively arranged on the surface of the pipe body connection shell (301) and the valve connection shell (305), and the surface of the valve connection shell (305) is provided with a threaded connection rod (501), and the right end of the threaded connection rod (501) is threadedly connected to the inner walls of the two sets of the first threaded rings (502) and the second threaded rings (503) in sequence; The left side of the valve connection shell (305) is connected to an inspection door (306) via screws, and the flame retardant component (4) is arranged on the right side of the inspection door (306); A foaming sponge (6) is placed on the lower surface of the inner wall of the outer protective shell (3) of the wellhead Christmas tree.

2. The valve protection structure for a wellhead Christmas tree according to claim 1, characterized in that: A contact pad (303) is provided on one opposite side of the two connection blocks (302), and the two contact pads (303) are both made of corrosion-resistant rubber material.

3. The valve protection structure for a wellhead Christmas tree according to claim 1, characterized in that: The flame retardant filler (402) is filled with liquid flame retardant.

4. The valve protection structure for a wellhead Christmas tree according to claim 1, characterized in that: The pipe body connection shell (301), the valve connection shell (305) and the inspection door (306) are all provided with a plurality of obliquely densely arranged anti-collision support rods (801) inside, and two adjacent anti-collision support rods (801) are in a triangular shape.

5. The valve protection structure for a wellhead Christmas tree according to claim 1, characterized in that: The interiors of the pipe body connection shell (301), the valve connection shell (305) and the inspection door (306) are filled with moisture-proof cotton (802) for absorbing moisture, and the moisture-proof cotton (802) is coated on the surfaces of the plurality of anti-impact support rods (801).

6. The installation method for a wellhead Christmas tree valve protection structure according to any one of claims 1 to 5, characterized in that: The installation method includes the following steps: Step (A) installs the flame retardant assembly (4) to the corresponding position, and the process is: install the flame retardant shell (401) on the surface of the inspection door (306), and stick the pressure block with a needle (404) on the surface of the wellhead Christmas tree connection valve (2), and then engage the flame retardant shell (401) and the pressure block with a needle (404) correspondingly; Step (B) installing the wellhead Christmas tree outer protective shell (3) on the surface of the wellhead Christmas tree pipe body (1) and the wellhead Christmas tree connecting valve (2), the steps comprising: (Ba) After the lower connecting block (302) is inserted into the surface of the wellhead tree tube body (1), the torsion spring (304) drives the upper connecting block (302) to rotate and then insert it into the surface of the wellhead tree tube body (1), and the torsion spring (304) drives the connecting block (302) to rotate to different angles according to the outer diameter of the wellhead tree tube body (1); (Bb) After the corresponding positions of the pipe body connection shell (301) and the valve connection shell (305) are engaged, the two threaded connection rods (501) are threadedly connected in sequence according to two adjacent groups of first threaded rings (502) and second threaded rings (503) in the order of second threaded ring (503), first threaded ring (502), first threaded ring (502), and second threaded ring (503) and then positioned; (Bc) connecting the four corners of the inspection door (306) to the inner wall of the valve connection shell (305) by means of screws, so that the flame retardant component (4) abuts against the left side of the wellhead Christmas tree connection valve (2); (Bd) Before the pipe body connecting shell (301) and the valve connecting shell (305) are engaged, a foam sponge (6) is placed inside; Step (C) is an operation when the wellhead Christmas tree pipe body (1) and the wellhead Christmas tree connecting valve (2) are opened, and the steps include: (Ca) First, the needle-carrying pressing block (404) will puncture the soft plastic sheet (403), causing the liquid inside the flame-retardant filler (402) to leak into the flame-retardant inside the outer protective shell (3) of the wellhead Christmas tree; (Cb) Under the action of gravity, the foam sponge (6) catches the wellhead Christmas tree connection valve (2); (Cc) The pipe body connection shell (301), the valve connection shell (305) and the inspection door (306) cooperate with the anti-impact effect of the anti-impact connection piece (5) to form a temporary bearing body connected to the wellhead Christmas tree pipe body (1).

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