An integrated underwater oil production wellhead device

Abstract

The present invention discloses an integrated underwater oil production wellhead device, which relates to the technical field of underwater oil and gas exploitation engineering, and solves the problem of the tight well slots of the water injection device and the oil production device. It includes: a high-pressure wellhead body; a casing hanger A; a casing hanger B; a tubing hanger, the inner side of the tubing hanger has a cavity that penetrates up and down, and at least one plug is placed in the cavity; a sealing cover; an underwater hydraulic gate valve; wherein there is an oil outlet hole on the side walls of the high-pressure wellhead body and the tubing hanger for communicating the underwater hydraulic gate valve with the cavity, and there is a sealing structure between the outer wall of the tubing hanger and the inner wall of the high-pressure wellhead body. The present invention optimizes the overall function and operation process of the oil production device, forms an integrated underwater oil production wellhead device with a simple and reliable structure and more convenient use, meets the economic underwater oil production requirements, and solves the problem of the tight well slots of the oil production device and the oil production device.

Description

Technical Field

[0001] The present invention relates to the technical field of underwater oil and gas production engineering, and particularly to an integrated underwater oil production wellhead device. Background Art

[0002] In the process of oil and gas production, especially the production of subsea oil, it is necessary to first drill a production well on the seabed and then install production equipment for production. Conventional underwater Christmas trees are large in size, heavy in weight, complex in installation operation, extremely costly, and inconvenient to maintain.

[0003] Since most existing oil fields adopt the oil production platform type of oil production method, this production method affects the navigation of surface vessels and the operation of fishermen, and the cost of building a drilling platform is also quite huge. To solve this dilemma, an underwater oil production method is urgently needed for offshore oil fields, which can not only not affect the waterway, but also meet the operation of fishermen. At the same time, the most crucial thing is to reduce the development cost under the condition of large demand. This demand is particularly urgent in offshore areas such as the Bohai Oilfield region. Summary of the Invention

[0004] The purpose of the present invention is to solve the above problems and design an integrated underwater oil production wellhead device. This underwater oil production system is applicable to underwater oil production in shallow water areas and solves the problem of high production cost despite large oil production demand.

[0005] To achieve the above purpose, the technical solution of the present invention is as follows: an integrated underwater oil production wellhead device, comprising:

[0006] A high-pressure wellhead body, the inner side of the high-pressure wellhead body has a vertically penetrating accommodation cavity;

[0007] A casing hanger A, the casing hanger A is set in the accommodation cavity, and a casing A is connected to the lower end of the casing hanger A;

[0008] A casing hanger B, the casing hanger B is located above the casing hanger A and is set in the accommodation cavity, a casing B is connected to the lower end of the casing hanger B, and the casing B sequentially passes through the casing hanger A and the casing A;

[0009] A tubing hanger, the tubing hanger is located above the casing hanger B and is set in the accommodation cavity, a tubing is connected to the lower end of the tubing hanger, the tubing hanger sequentially passes through the casing hanger B and the casing B, the inner side of the tubing hanger has a vertically penetrating cavity, and at least one plug is placed in the cavity to isolate the cavity from the external space of the tubing hanger;

[0010] An oil production tree cap, the oil production tree cap is installed and fixed on the top of the high-pressure wellhead body;

[0011] Subsea hydraulic gate valve, and the subsea hydraulic gate valve is installed on the high-pressure wellhead body;

[0012] Wherein, the side walls of the high-pressure wellhead body and the tubing hanger are provided with oil outlet holes for communicating the subsea hydraulic gate valve with the cavity, the oil outlet holes are located below the plug, and sealing structures are provided on both sides above the oil outlet holes between the outer wall of the tubing hanger and the inner wall of the high-pressure wellhead body.

[0013] Furthermore, a clamping groove is provided on the inner wall of the accommodation cavity, a locking ring is fixedly installed on the outer side of the casing hanger A, the locking ring is provided with clamping blocks capable of expanding and contracting, the outer side of the casing hanger A is threadedly connected with a spacer ring A, and an inclined surface fit is provided between the lower side of the spacer ring A and the clamping blocks to control the outward expansion of the clamping blocks and engage with the clamping groove.

[0014] Furthermore, a locking ring is fixedly installed on the outer side of the casing hanger B, the locking ring is provided with clamping blocks capable of expanding and contracting, the outer side of the casing hanger B is threadedly connected with a spacer ring B, and an inclined surface fit is provided between the lower side of the spacer ring B and the clamping blocks to control the outward expansion of the clamping blocks and engage with the clamping groove.

[0015] Furthermore, a rubber sealing ring is provided between the spacer ring A and the casing hanger A and the high-pressure wellhead body, a metal sealing ring is provided between the spacer ring B and the casing hanger B and the high-pressure wellhead body, the metal sealing ring is clamped with the spacer ring B and is in close contact with the inner wall of the high-pressure wellhead body.

[0016] Furthermore, the sealing structure includes a metal seal, an extrusion member and a rubber seal. The metal seal is provided with an extrusion groove having a tapered cross-sectional shape. The two side surfaces of the extrusion member are in inclined surface fit with the extrusion groove. The rubber seals are provided between the metal seal and the tubing hanger and between the metal seal and the high-pressure wellhead body. Sealing portions are formed by outward protrusions on both sides of the metal seal.

[0017] Furthermore, a lifting hook is provided at the bottom of the Christmas tree cap. The Christmas tree cap is fixed to the high-pressure wellhead body through a connecting device. A plugging head is installed at the oil outlet of the subsea hydraulic gate valve.

[0018] Furthermore, a rubber sealing ring is provided between the Christmas tree cap and the inner wall of the wellhead body. A lifting lug is welded to the top of the Christmas tree cap.

[0019] Furthermore, a base is further included. The base is provided with a connecting sleeve, and the high-pressure wellhead body is fixedly connected to the connecting sleeve through a flange.

[0020] Furthermore, a mechanical compass and an anode block are installed on the base, and a protective net is arranged outside the base to cover the base and the high-pressure wellhead body.

[0021] Furthermore, a guide cylinder is welded on the base, and a guide rod is inserted and connected in the guide cylinder.

[0022] Compared with the prior art, its beneficial effects are as follows:

[0023] The present invention optimizes the overall function and operation process of the underwater oil production device, forms an integrated underwater oil production wellhead device with a simple and reliable structure and more convenient use, meets the economic underwater oil production requirements. The underwater oil production wellhead device controls the opening and closing of the waterway through an underwater hydraulic gate valve, and is communicated with the inner cavity of the tubing hanger through an oil outlet hole. The upper side of the inner cavity of the tubing hanger is isolated from the external pressure through a plug. During the oil production operation, the underwater hydraulic gate valve is opened to output oil from the tubing and is transported to the onshore oil depot or the ship through a pipeline. This oil production wellhead device has a simple and reliable structure and is convenient to use, neither occupying the shipping lane nor affecting the operation of fishermen. In particular, sealing structures are arranged on both the upper and lower sides of the oil outlet hole. The sealing structure is activated by self-extrusion, with a simple and reliable design and convenient installation, greatly reducing the difficulty of blind operation during underwater installation and at the same time reducing the loss rate of the sealing parts during the installation process. Description of the Drawings

[0024] Figure 1 is the overall structural schematic diagram of the integrated underwater oil production wellhead device of the present invention;

[0025] Figure 2 is the structural schematic diagram of the integrated underwater oil production wellhead device when the high-pressure wellhead body is removed;

[0026] Figure 3 is the sectional structural schematic diagram of the integrated underwater oil production wellhead device;

[0027] Figure 4 is Figure 3 the enlarged structural view of part A in

[0028] Figure 5 is the structural schematic diagram of the Christmas tree cap and its attached structures;

[0029] Figure 6 is the bottom structural schematic diagram of the Christmas tree cap;

[0030] Figure 7 is the axonometric sectional structural schematic diagram of the integrated underwater oil production wellhead device when the guide rod is removed;

[0031] Figure 8 is the sectional plan view of the integrated underwater oil production wellhead device when the guide rod is removed;

[0032] Figure 9 is Figure 8 The enlarged view of the structure at position B in

[0033] Figure 10 is Figure 8 The enlarged view of the structure at position C in

[0034] Figure 11 is Figure 8 The enlarged view of the structure at position D in

[0035] Figure 12 is Figure 11 The enlarged view of the structure at position E in

[0036] In the figure, 1 is the base; 101 is the connecting sleeve; 102 is the guide tube; 2 is the high-pressure wellhead body; 3 is the Christmas tree cap; 4 is the guide rod; 5 is the anode block; 6 is the subsea hydraulic gate valve; 7 is the plugging head; 8 is the mechanical compass; 9 is the casing hanger B; 10 is the tubing hanger; 1001 is the cavity; 1002 is the oil outlet hole; 11 is the casing hanger A; 12 is the spacer ring A; 13 is the spacer ring B; 14 is the casing A; 15 is the casing B; 16 is the tubing; 17 is the plug; 18 is the protective net; 19 is the rubber sealing ring; 20 is the lifting lug; 21 is the sealing plug; 22 is the connecting device; 221 is the positioning pin; 23 is the pipeline joint; 24 is the limit retaining ring; 25 is the hook; 26 is the sealing structure; 261 is the metal seal; 2611 is the sealing part; 262 is the extrusion part; 263 is the rubber seal; 27 is the locking ring; 28 is the metal sealing ring; 29 is the excitation ring; 30 is the fixing ring; 31 is the limit ring. Specific embodiments

[0037] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0038] As Figures 1 - 8 shown, a preferred embodiment of the present invention proposes an integrated subsea production wellhead device, and the production system mainly includes: the high-pressure wellhead body 2, the casing hanger A 11, the casing hanger B 9, the tubing hanger 10, the base 1, the subsea hydraulic gate valve 6, the spacer ring A 12, the spacer ring B 13, the mechanical compass 8, the anode block 5, the Christmas tree cap 3, etc.

[0039] Refer to Figure 1, a connecting sleeve 101 is welded on the base 1, and the lower end of the high-pressure wellhead body 2 is fixedly connected to the connecting sleeve 101 through a flange. The high-pressure wellhead body 2 is cylindrical in shape and has an accommodation cavity for accommodating a hanger inside. Inside the accommodation cavity on the inner side of the high-pressure wellhead body 2, a casing hanger A11, a spacer ring A12, a casing hanger B9, a spacer ring B13, a tubing hanger 10, and a Christmas tree cap 3 are successively seated from bottom to top.

[0040] As Figure 3 shown, three slots corresponding to the casing hanger A11, the casing hanger B9, and the tubing hanger 10 are respectively opened on the inner wall of the accommodation cavity from top to bottom. Locking rings 27 are installed on the outer sides of the casing hanger A11, the casing hanger B9, and the tubing hanger 10. The circumference of the locking block has a plurality of clamping blocks that can open and close, and the clamping blocks have a certain elasticity.

[0041] The spacer ring A12 is installed on the casing hanger A11 and fixed together with it by thread fitting. During the installation process of the spacer ring A12, the locking ring 27 on the casing hanger A11 can be activated. The lower side of the spacer ring A12 is inserted into the gap between the locking ring 27 and the casing hanger A11, and is in inclined surface fit with the clamping blocks on the locking ring 27, squeezing the clamping blocks, so that the clamping blocks open outwards and are engaged with the slots on the inner wall of the high-pressure wellhead body 2, fixing the casing hanger A11 and the high-pressure wellhead body 2 together.

[0042] A rubber sealing ring is provided between the spacer ring A12, the casing hanger A11, and the high-pressure wellhead body 2 to seal the pressure between the well and the annulus.

[0043] The structure of the spacer ring B13 is the same as that of the spacer ring A12. The spacer ring B13 is installed on the casing hanger B9 and fixed together with it by thread fitting. By the same principle, during the installation process of the spacer ring B13, the locking ring 27 on the casing hanger B9 can be activated. The lower side of the spacer ring B13 is inserted into the gap between the locking ring 27 and the casing hanger B9, and is in inclined surface fit with the clamping blocks on the locking ring 27, squeezing the clamping blocks, so that the clamping blocks open outwards and are engaged with the slots on the inner wall of the high-pressure wellhead body 2, fixing the casing hanger B9 and the high-pressure wellhead body 2 together, and at the same time, the casing hanger B9 is seated on the top of the casing hanger A11.

[0044] Reference Figure 10 , a metal sealing ring 28 is provided between the spacer ring B13, the casing hanger B9, and the high-pressure wellhead body 2. The cross-sectional shape of the metal sealing ring 28 is similar to an H shape. The metal sealing ring 28 is located in the groove on the outer side of the spacer ring B13 and is in interference fit with the inner wall of the high-pressure wellhead body 2, with stronger sealing performance, sealing the pressure between the well and the annulus.

[0045] The lower end of the casing hanger A11 is threadedly connected to the casing A14, and the casing A14 extends downward continuously. The lower end of the casing hanger B9 is threadedly connected to the casing B15, and the casing B15 passes through the casing hanger A11 and the casing A14.

[0046] Reference Figure 9 , a fixing ring 30, a limiting retaining ring 24, a limiting ring 31 and an excitation ring 29 are arranged outside the tubing hanger 10. For the specific cooperation of these components with the locking ring 27, reference can be made to the hanger recovery tool with the publication number CN118442016A. With the above structure, the installation and recovery of the tubing hanger 10 can be quickly completed through this tool. After the locking ring 27 on the tubing hanger 10 is activated, it will be engaged with the card slot on the inner wall of the high-pressure wellhead body 2, so that the tubing hanger 10 is fixed to the high-pressure wellhead body 2. The locking system has a reliable structure, good stability and convenient installation.

[0047] Such as Figure 7 , Figure 8 As shown in the figure, the inner side of the tubing hanger 10 has a cavity 1001 that penetrates up and down. The lower end of the tubing hanger 10 is threadedly connected to a tubing 16, and the tubing 16 communicates with the cavity 1001. The tubing 16 will pass through the casing hanger B9, the casing B15, the casing hanger A11, the casing A14, and extend downward.

[0048] Such as Figure 7 As shown in the figure, the subsea hydraulic gate valve 6 is installed on the outside of the high-pressure wellhead body 2. The valve is hydraulically controlled and matches the strong opening interface within the API 17H standard. During oil production operations, oil production can be carried out through this valve, and the valve controls the opening and closing of the water production oil circuit.

[0049] Such as Figure 11 As shown in the figure, an oil outlet hole 1002 is opened on the side of the high-pressure wellhead body 2 and the tubing hanger 10 to communicate the subsea hydraulic gate valve 6 with the cavity 1001 inside the tubing hanger 10. And a sealing structure 26 is arranged at the lower part between the tubing hanger 10 and the wellhead housing body. The sealing structure 26 is located on the upper side and the lower side of the oil outlet hole 1002 to ensure the sealing performance. The sealing structure 26 includes two sealing forms: rubber sealing and metal sealing, with reliable sealing, high pressure resistance, good corrosion resistance, long service life and high stability.

[0050] Such as Figure 11 , Figure 12As shown in the figure, the above-mentioned sealing structure 26 is mainly composed of a metal seal 261, an extrusion member 262, and a rubber seal 263. All three components are in a ring structure. There is an extrusion groove on the metal seal 261, and both inner side walls of the extrusion groove are inclined planes. The two outer side walls of the extrusion member 262 are also inclined planes. After the extrusion member 262 is inserted into the extrusion groove, it cooperates with its inclined plane to extrude the two side walls of the extrusion groove outward. The two outer side walls of the metal seal 261 bulge outward to form a sealing portion 2611. When the extrusion member 262 extrudes the metal seal 261, the sealing portion 2611 will closely adhere to the inner wall of the high-pressure wellhead body 2 and the outer wall of the tubing hanger 10, thereby playing a sealing role. Rubber seals 263 are provided between the metal seal 261 and the tubing hanger 10, and between the metal seal 261 and the high-pressure wellhead body 2. The rubber seal 263 also bulges outward to form a sealing portion 2611, and this sealing portion 2611 is also extrusion-activated sealing.

[0051] Both forms of sealing adopt the self-extrusion method to activate the seal. The external pressure will extrude the extrusion member 262, thereby activating the metal seal 261 and the rubber seal 263. The greater the extrusion force, the stronger the sealing performance. This structural design is simple and reliable, easy to install, greatly reducing the difficulty of underwater blind installation, and at the same time reducing the loss rate of seals during the installation process.

[0052] Reference Figure 9 , a sealing structure 26 is also provided on the upper part of the tubing hanger 10, and the sealing form is the same as that of the lower part. This sealing structure 26 is located below the locking ring 27 on the tubing hanger 10.

[0053] As Figure 1 , Figure 5 shown, the Christmas tree cap 3 is installed on the top of the high-pressure wellhead body 2 and is fixed to the high-pressure wellhead body 2 through a connecting device 22. At the same time, a rubber sealing ring 19 is used to seal between the Christmas tree cap 3 and the high-pressure wellhead body 2, which can prevent seawater and marine organisms from entering the high-pressure wellhead body 2.

[0054] Reference Figure 6 , the Christmas tree cap 3 is composed of a sealing plug 21 and a connecting device 22. A hook 25 is designed at the bottom of the sealing plug 21 to hang the ethylene glycol device. Since there is still a certain space between the tubing hanger 10 and the sealing plug 21, the ethylene glycol device is hung on the hook 25. After the ethylene glycol volatilizes, it can prevent corrosion and improve the service life of the device.

[0055] Reference Figure 4 , Figure 6 , Figure 9, a pipeline joint 23 is installed on the sealing plug 21. The bottom of the sealing plug 21 has positioning pins 221 and a card slot for positioning and fixing with the oil pipe hanger 10 below. The middle of the above-mentioned pipeline joint 23 has a wire passing hole that penetrates up and down, so that the pipeline can pass through the wire passing hole. The pipeline will pass through the wire passing hole and through the sealing plug 21 to achieve the coherence of pipeline crossing, and at the same time, the pipeline is constrained and fixed.

[0056] A lifting lug 20 is welded on the top of the sealing plug 21 for hoisting the integrated underwater oil production wellhead device.

[0057] As Figure 1 , Figure 7 shown, a plug 7 is installed at the oil outlet of the underwater hydraulic gate valve 6. The plug 7 is fixedly installed on the underwater hydraulic gate valve 6 through a flange. When not producing oil, the oil outlet of the underwater hydraulic gate valve 6 is blocked by the plug 7.

[0058] During oil production, the plug 7 is removed and the oil pipeline is connected. Since the upper part of the cavity 1001 inside the oil pipe hanger 10 is through, two plugs 17 need to be placed in the cavity 1001 at this time to isolate the oil production pressure from the external pressure. The crude oil cannot flow out from the upper part of the cavity 1001. After the upper part of the cavity 1001 is blocked, the crude oil will flow out along one side of the cavity 1001 and be output to the shore oil tank or oil tanker through the oil pipe 16.

[0059] The plug 17 and the cavity 1001 inside the oil pipe hanger 10 are in interference fit and are hard pressed in. It can be taken out with a special tool when taking it out.

[0060] When not producing oil, close the underwater hydraulic gate valve 6, take out the plug 17 at the same time, and then remove the Christmas tree cap 3. The oil can flow upward along the oil pipe 16.

[0061] Refer to Figure 1 , Figure 2 , the anode block 5 and the mechanical compass disk 8 are both installed on the outside of the base 1, at the top of the base 1. The anode block 5 is used to slow down the seawater corrosion, and the mechanical compass disk 8 is used for leveling when installing the wellhead. At the same time, a protective net 18 is arranged on the outside of the entire oil production system. The protective net 18 covers the entire base 1 and the high-pressure wellhead body 2 to cover the base 1 and each structure installed on the base 1 to prevent tugboat fishing nets and falling objects.

[0062] The guiding cylinders 102 are welded at multiple positions on the base 1. A guiding rod 4 is inserted and connected in the guiding cylinder 102. The lower end of the guiding rod 4 will be inserted into the seabed. When the subsea production system below is lowered, the guiding cylinder 102 will slide downward along the guiding rod 4. Due to the certain fluidity of seawater, the integrated subsea production wellhead device can be lowered to a specified position on the seabed through the guiding rod 4.

[0063] The above technical solutions only reflect the preferred technical solutions of the technical solutions of the present invention. Some changes that those skilled in the art of this technical field may make to some parts thereof all reflect the principles of the present invention and fall within the protection scope of the present invention.

Claims

1. An integrated underwater oil production wellhead device, characterized in that: include: A high-pressure wellhead body (2), wherein the inner side of the high-pressure wellhead body (2) has a receiving cavity that passes through from top to bottom; A casing hanger A (11), the casing hanger A (11) is suspended in the accommodating cavity, and the lower end of the casing hanger A (11) is connected to a casing A (14); A casing hanger B (9), the casing hanger B (9) being located above the casing hanger A (11) and hanging in the accommodating cavity, the lower end of the casing hanger B (9) being connected to a casing B (15), the casing B (15) passing through the casing hanger A (11) and the casing A (14) in sequence; A tubing hanger (10), the tubing hanger (10) being located above the casing hanger B (9) and hanging in the accommodating cavity, the lower end of the tubing hanger (10) being connected to an oil pipe (16), the tubing hanger (10) passing through the casing hanger B (9) and the casing B (15) in sequence, the inner side of the tubing hanger (10) being provided with a cavity (1001) passing through from top to bottom, at least one plug (17) being placed in the cavity (1001) for isolating the cavity (1001) from the external space of the tubing hanger (10); A Christmas tree cap (3), the Christmas tree cap (3) being mounted and fixed on the top of the high-pressure wellhead body (2); An underwater hydraulic gate valve (6), wherein the underwater hydraulic gate valve (6) is installed on the high-pressure wellhead body (2); The side walls of the high-pressure wellhead body (2) and the tubing hanger (10) are provided with an oil outlet hole (1002) for connecting the underwater hydraulic gate valve (6) with the cavity (1001); the oil outlet hole (1002) is located below the plug (17); and sealing structures (26) are provided on both sides above the oil outlet hole (1002) between the outer wall of the tubing hanger (10) and the inner wall of the high-pressure wellhead body (2).

2. The integrated underwater oil production wellhead device according to claim 1, characterized in that: The inner wall of the accommodating cavity is provided with a slot, a locking ring (27) is fixedly installed on the outer side of the casing hanger A (11), and the locking ring (27) has a clamping block that can be opened and closed. The outer side of the casing hanger A (11) is threadedly connected with a spacer ring A (12), and the lower side of the spacer ring A (12) and the clamping block are matched with an inclined surface to control the clamping block to expand outward and clamp with the slot.

3. The integrated underwater oil production wellhead device according to claim 2, characterized in that: A locking ring (27) is fixedly installed on the outer side of the casing hanger B (9), and a clamping block that can be opened and closed is provided on the locking ring (27). A spacer ring B (13) is threadedly connected to the outer side of the casing hanger B (9), and the lower side of the spacer ring B (13) is matched with the clamping block in an inclined surface to control the clamping block to expand outward and clamp with the clamping groove.

4. The integrated underwater oil production wellhead device according to claim 3, characterized in that: A rubber sealing ring is provided between the spacer ring A (12), the casing hanger A (11) and the high-pressure wellhead body (2), and a metal sealing ring (28) is provided between the spacer ring B (13), the casing hanger B (9) and the high-pressure wellhead body (2). The metal sealing ring (28) is clamped with the spacer ring B (13) and is tightly attached to the inner wall of the high-pressure wellhead body (2).

5. The integrated underwater oil production wellhead device according to claim 1, characterized in that: The sealing structure (26) comprises a metal seal (261), an extrusion piece (262) and a rubber seal (263); the metal seal (261) is provided with an extrusion groove with a conical cross-section; the two side surfaces of the extrusion piece (262) are inclinedly matched with the extrusion groove; the rubber seal (263) is arranged between the metal seal (261) and the oil pipe hanger (10) and between the metal seal (261) and the high-pressure wellhead body (2); the two sides of the metal seal (261) are protruded outward to form a sealing portion (2611).

6. The integrated underwater oil production wellhead device according to claim 1, characterized in that: A hook (25) is provided at the bottom of the Christmas tree cap (3); the Christmas tree cap (3) and the high-pressure wellhead body (2) are fixed via a connecting device (22); and a plugging head (7) is installed at the oil outlet of the underwater hydraulic gate valve (6).

7. The integrated underwater oil production wellhead device according to claim 6, characterized in that: A rubber sealing ring (19) is arranged between the Christmas tree cap (3) and the inner wall of the wellhead body, and a lifting lug (20) is welded to the top of the Christmas tree cap (3).

8. The integrated underwater oil production wellhead device according to claim 1, characterized in that: It also comprises a base (1), the base (1) having a connecting sleeve (101), and the high-pressure wellhead body (2) is fixedly connected to the connecting sleeve (101) via a flange.

9. The integrated underwater oil production wellhead device according to claim 8, characterized in that: A mechanical compass (8) and an anode block (5) are mounted on the base (1), and a protective net (18) for covering the base (1) and a high-pressure wellhead body (2) is arranged on the outside of the base (1).

10. The integrated underwater oil production wellhead device according to claim 8, characterized in that: A guide cylinder (102) is welded on the base (1), and a guide rod (4) is inserted and connected inside the guide cylinder (102).

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