Single-pile barrel-shaped foundation wellhead platform

Abstract

The utility model discloses a single-pile bucket foundation wellhead platform, which is used for offshore oilfield development and comprises a single-pile bucket foundation unit (3), a marine riser unit (2) mounted in the single-pile bucket foundation unit (3) and a wellhead support module (1) arranged at the top of the marine riser unit (2), and the bottom of the marine riser unit (2) is directly communicated to the bottom of the single-pile bucket foundation unit (3). A detachable sealing plug is arranged at the bottom of the marine riser unit (2), a closed bucket cabin is defined between the single-pile bucket foundation unit (3) and the marine riser unit (2), and a pressure regulating device used for pressurizing the closed bucket cabin to enable the closed bucket cabin to sink or decompressing the closed bucket cabin to enable the closed bucket cabin to float upwards is installed on the single-pile bucket foundation unit (3). The single-pile barrel-shaped foundation wellhead platform achieves efficient, economical and environment-friendly offshore oilfield development, and is particularly suitable for development of offshore marginal oilfields.

Description

Technical Field

[0001] The utility model relates to the technical field of offshore oil facilities, in particular to a single-pile bucket foundation wellhead platform. Background Art

[0002] The single-pile bucket foundation wellhead platform for offshore oilfield development is an innovative offshore engineering structure. It combines the stability of the single-pile bucket foundation and the flexibility of the simple wellhead platform, and is especially suitable for the development of offshore marginal oilfields. The bucket foundation utilizes the principle of negative pressure penetration and has the advantages of stable structure and fatigue resistance. Compared with the traditional pile foundation, it has the advantages of saving construction and installation costs, being convenient for transportation and installation, being reusable, short construction time, and simple exploration and research required for construction. At present, the single-pile bucket foundation is mainly applied in the field of offshore wind power and has not been widely applied in the oil field.

[0003] In summary, how to effectively solve the problems such as the insufficient application of the single-pile bucket foundation in the existing offshore oil technology is an urgent problem for those skilled in the art at present. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a single-pile bucket foundation wellhead platform, which realizes efficient, economic and environmental protection offshore oilfield development, and is especially suitable for the development of offshore marginal oilfields.

[0005] To solve the above technical problems, the utility model provides the following technical solutions:

[0006] A single-pile bucket foundation wellhead platform for offshore oilfield development, comprising a single-pile bucket foundation unit, a riser unit installed in the single-pile bucket foundation unit, and a wellhead support module arranged at the top of the riser unit. The bottom of the riser unit directly leads to the bottom of the single-pile bucket foundation unit. A detachable seal plug is arranged at the bottom of the riser unit. A closed barrel cabin is formed between the single-pile bucket foundation unit and the riser unit. A pressure regulating device is installed on the single-pile bucket foundation unit to pressurize the closed barrel cabin to make it sink or decompress to make it float.

[0007] Optionally, the riser unit includes a plurality of risers and a riser barrel arranged on the outer periphery of all the risers. The foundation barrel of the single-pile bucket foundation unit and the riser barrel are concentric. The closed barrel cabin is a water isolation ring between the foundation barrel and the riser barrel. The water isolation ring includes a plurality of independently closed cabins in the circumferential direction. Each cabin is connected with an independent pressure regulating device. The single-pile bucket foundation wellhead platform is leveled by adjusting the pressure values of the pressure regulating devices in different directions.

[0008] Optionally, the pressure regulating device includes:

[0009] An angle sensor for detecting the current angle between the axis of the single-pile bucket foundation unit and the horizontal plane;

[0010] A pressure regulating part connected to the angle sensor, and used to control the gas negative pressure in the chamber on the acute angle side to be less than the gas negative pressure in the chamber on the obtuse angle side when the current angle detected by the angle sensor is not a right angle.

[0011] Optionally, the pressure regulating part includes:

[0012] A pressure sensor for detecting the gas negative pressure in each chamber;

[0013] A calculation unit connected to the pressure sensor, and used to calculate the required gas negative pressure in each chamber when the axis of the single-pile bucket foundation unit rotates to the vertical direction when the current angle detected by the angle sensor is not a right angle;

[0014] A pressure regulating valve connected to the calculation unit, and used to pressurize or depressurize each chamber according to the negative pressure calculated by the calculation unit.

[0015] Optionally, the closed barrel chamber is divided into a plurality of chambers by a plurality of vertical support plates, and the extension line of the support plate passes through the center of the water separation barrel.

[0016] Optionally, the inner wall of the water separation barrel and the outer wall of each water separation pipe are connected by a diagonal brace, and the extension line of the diagonal brace passes through the centers of the water separation barrel and the water separation pipe.

[0017] Optionally, the water separation barrel and the water separation pipe are connected in an inscribed manner.

[0018] Optionally, a plurality of partition plates are arranged in the water separation barrel, the partition plates divide the water separation barrel into a plurality of water separation areas, each water separation area is provided with a water separation pipe, the centers of the water separation pipes are distributed on the pitch circle with the center of the water separation barrel as the center, the support plate and the corresponding partition plate are on the same straight line, and the extension lines of the support plate and the partition plate pass through the center of the foundation barrel.

[0019] Optionally, the water separation pipe and the partition plate are connected by a cross brace, the cross brace is perpendicular to the partition plate, and the connection points of the partition plate and the cross braces on both sides coincide.

[0020] Optionally, the aspect ratio of the length to the diameter of the foundation barrel is set to 2:1, and the diameter of the foundation barrel is greater than or equal to 5 meters.

[0021] The beneficial effects of the present utility model are as follows. The riser pipe unit is installed inside the single-pile bucket foundation unit. The single-pile bucket foundation unit provides greater buoyancy and stability, which helps to resist the wind and waves in the ocean. The riser pipe is placed inside the single-pile bucket foundation unit, effectively reducing the acting force of the environmental load on the riser pipe under harsh sea conditions, protecting the riser pipe from the action of wind, waves and currents, and effectively protecting the safety of the riser pipe. The riser pipe unit is fixed to the seabed through the single-pile bucket foundation unit. The single-pile bucket foundation unit serves as the main support structure, providing buoyancy and additional stability for the riser pipe unit to penetrate deep into the seabed. The wellhead support module is supported on the top of the riser pipe unit. The wellhead support module is a small operation platform for drilling and extracting oil.

[0022] The upper end of the riser pipe of the riser pipe unit passes through the wellhead support module, and the bottom of the riser pipe unit leads directly to the bottom of the single-pile bucket foundation unit. The riser pipe unit connects the wellhead and the seabed. Pipeline components such as oil pipes and electric wires pass through the upper end of the riser pipe to the seabed, protecting the pipelines and reducing the influence of sea waves on the pipelines. A detachable seal plug is provided at the bottom of the riser pipe unit. Specifically, the seal plug can be a concrete plug in the pile. Specifically, before the single-pile bucket foundation unit sinks to the seabed, a layer of concrete can be poured at the bottom of the riser pipe unit to form a current concrete plug in the pile to prevent soil and seawater from penetrating into the riser pipe unit when the single-pile bucket foundation unit is installed in place. After the sinking construction of the single-pile bucket foundation unit is completed, use the drilling platform to conduct the casing operation, use the drill bit to drill the riser pipe into the formation, and rely on the drill bit to break it when encountering the concrete plug to realize the casing running.

[0023] A closed barrel cabin is formed between the single-pile bucket foundation unit and the riser pipe unit. A pressure regulating device is installed on the single-pile bucket foundation unit. The pressure regulating device is communicated with the closed barrel cabin to pressurize the closed barrel cabin to make it sink or decompress to make it float. Through the pressure regulating device, efficient repeated plugging and unplugging are realized, reducing the dependence on auxiliary pile driving equipment such as cranes and barges. This not only reduces the cost, but also improves the flexibility and speed of the operation. The platform can quickly move between different well positions to support rolling development, which is particularly important for marginal oil fields with small reserves or complex geological conditions, maximizing the exploitation efficiency and economy of resources. Brief Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0025] Figure 1 It is a schematic structural diagram of a single-pile bucket-shaped foundation wellhead platform provided by a specific embodiment of the present utility model;

[0026] Figure 2 It is a schematic diagram of the overall structure of the riser pipe unit and the single-pile bucket foundation unit;

[0027] Figure 3 It is a top view of the riser pipe unit and the single-pile bucket foundation unit;

[0028] Figure 4 It is a bottom view of the single-pile bucket foundation.

[0029] Reference numerals:

[0030] 1 - Wellhead support module, 2 - Riser pipe unit, 3 - Single-pile bucket foundation unit, 4 - Foundation bucket, 5 - Installation hole, 6 - Upper sealing plate, 7 - Riser pipe bucket, 8 - Support plate, 9 - Partition plate, 10 - Cross brace, 11 - Riser pipe, 12 - Inclined brace, 13 - Concrete plug in pile. Specific implementation manner

[0031] The core of the present utility model is to provide a single-pile bucket foundation wellhead platform, which realizes efficient, economic and environmental protection of offshore oilfield development, and is especially suitable for the development of offshore marginal oilfields.

[0032] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0033] Please refer to Figures 1 to 4 , Figure 1 It is a schematic diagram of the structure of the single-pile bucket foundation wellhead platform provided by a specific implementation manner in the present utility model; Figure 2 It is a schematic diagram of the overall structure of the riser pipe unit and the single-pile bucket foundation unit; Figure 3 It is a top view of the riser pipe unit and the single-pile bucket foundation unit; Figure 4 It is a bottom view of the single-pile bucket foundation.

[0034] In a specific implementation manner, the single-pile bucket foundation wellhead platform provided by the present utility model is used for offshore oilfield development, and includes a single-pile bucket foundation unit 3, a riser pipe unit 2 installed in the single-pile bucket foundation unit 3, and a wellhead support module 1 provided at the top of the riser pipe unit 2. The bottom of the riser pipe unit 2 directly leads to the bottom of the single-pile bucket foundation unit 3. A detachable sealing plug is provided at the bottom of the riser pipe unit 2. A closed barrel cabin is formed between the single-pile bucket foundation unit 3 and the riser pipe unit 2. A pressure regulating device is installed on the single-pile bucket foundation unit 3 to pressurize the closed barrel cabin to sink it or decompress it to make it float.

[0035] In the above structure, the wellhead platform of the single-pile bucket foundation is applicable to the development of offshore marginal oilfields, especially for occasions that require rapid movement and deployment. The wellhead platform of the single-pile bucket foundation includes a single-pile bucket foundation unit 3, a riser unit 2, a wellhead support module 1, and a pressure regulating device.

[0036] The riser unit 2 is installed inside the single-pile bucket foundation unit 3, and the riser unit 2 is fixed to the seabed through the single-pile bucket foundation unit 3. The single-pile bucket foundation unit 3 serves as the main support structure, providing buoyancy and additional stability for the riser unit 2 to penetrate deep into the seabed. The wellhead support module 1 is supported on the top of the riser unit 2. The wellhead support module 1 is a small operating platform used for drilling and extracting oil.

[0037] The upper end of the riser 11 of the riser unit 2 passes through the wellhead support module 1, and the bottom of the riser unit 2 extends straight to the bottom of the single-pile bucket foundation unit 3. The riser unit 2 connects the wellhead and the seabed. Pipeline components such as oil pipes and electric wires pass through the upper end of the riser 11 to the seabed, protecting the pipelines, reducing the influence of sea waves on the pipelines, reducing the diameter or wall thickness of the riser 11, saving the steel consumption of the riser 11, and reducing costs.

[0038] A detachable seal plug is provided at the bottom of the riser unit 2. Specifically, the seal plug can be a concrete plug 13 inside the pile. Specifically, a layer of concrete can be poured at the bottom of the riser unit 2 before the single-pile bucket foundation unit 3 sinks to the seabed to form the in-pile concrete plug 13, preventing soil and seawater from penetrating into the riser unit 2 when the single-pile bucket foundation unit 3 is installed in place. After the sinking construction of the single-pile bucket foundation unit 3 is completed, a casing operation is carried out using a drilling platform, and the riser 11 is drilled into the formation using a drill bit. When encountering the concrete plug, it is broken relying on the drill bit to realize the casing running.

[0039] A closed barrel cabin is formed between the single-pile bucket foundation unit 3 and the riser unit 2. A pressure regulating device is installed on the single-pile bucket foundation unit 3, and the pressure regulating device is communicated with the closed barrel cabin to pressurize the closed barrel cabin to make it sink or decompress to make it float, and the insertion and extraction of the single-pile bucket foundation unit 3 are realized through the negative pressure effect.

[0040] The single-pile bucket foundation wellhead platform provided by the present utility model realizes efficient repeated plugging and unplugging through a pressure regulating device, reducing the dependence on auxiliary pile driving equipment such as cranes and barges. This not only reduces costs but also improves the flexibility and speed of operations. The platform can quickly move between different well positions, supporting rolling development, which is particularly important for marginal oilfields with small reserves or complex geological conditions, maximizing the exploitation efficiency and economy of resources. The single-pile bucket foundation unit 3 provides greater buoyancy and stability, helping to resist wind and waves in the ocean. The riser 11 is placed inside the single-pile bucket foundation unit 3, effectively reducing the acting force of environmental loads on the riser 11 under severe sea conditions, protecting the riser 11 from the effects of wind, waves, and currents, and effectively ensuring the safety of the riser 11. It simplifies the design and construction process, has a lower construction cost, reduces the volume and floor area of the platform, reduces the impact on the marine environment, and improves the safety of operations.

[0041] Based on the above embodiments, the riser unit 2 includes multiple risers 11 and a riser bucket 7 arranged on the outer periphery of all the risers 11. The foundation bucket 4 of the single-pile bucket foundation unit 3 and the riser bucket 7 are concentric. The closed bucket compartment is the water isolation ring between the foundation bucket 4 and the riser bucket 7. The water isolation ring includes multiple independently closed compartments in the circumferential direction, and each compartment is connected to an independent pressure regulating device. The single-pile bucket foundation wellhead platform is leveled by adjusting the pressure values of the pressure regulating devices in different orientations.

[0042] In practical applications, the multiple risers 11 are symmetrically distributed around the center. For example, four risers 11 are distributed at the four corners, forming a 90° interval. This layout helps to evenly disperse environmental loads. The risers 11 are concentrated in a circular area centered on the center of the foundation bucket 4, facilitating overall coverage through the concentric circles of the foundation bucket 4. That is, a riser bucket 7 is arranged on the outer periphery of the risers 11. The riser bucket 7 wraps around the outer periphery of the risers 11, providing protection for the risers 11 and reducing the direct impact of wind and waves on the risers 11 under severe sea conditions. Through the protection of the riser bucket 7, the acting force of environmental loads on the risers 11 is effectively reduced, protecting the risers 11 from the direct influence of wind, waves, and currents, reducing potential structural damage, and improving the durability and stability of the risers 11.

[0043] At the same time, the inner side of the riser bucket 7 is connected to the risers 11, and the outer side of the riser bucket 7 is connected to the foundation bucket 4. Through the connection of the riser bucket 7, the risers 11 and the foundation bucket 4 are combined together to form a closed bucket compartment structure. The water isolation ring is divided into multiple independent compartments, and the multiple compartments are distributed in the circumferential direction of the water isolation ring, that is, in different orientations. Each compartment is equipped with an independent pressure regulating device, allowing individual control of the negative pressure in each compartment. This design enables the wellhead platform to level by precisely controlling the negative pressure in each compartment, ensuring the verticality of the pile body, thereby improving the stability and operation efficiency of the entire platform.

[0044] In the above embodiments, the negative pressure technology is used to achieve efficient insertion, extraction and leveling of the single-pile bucket foundation unit 3, so as to reduce the dependence on traditional pile driving equipment, ensure verticality, improve operation efficiency, achieve rapid movement and reuse of the platform, thereby reducing the comprehensive cost of marginal oilfield development and improving development efficiency and economy.

[0045] Based on the above respective embodiments, the pressure regulating device includes:

[0046] An angle sensor for detecting the current angle between the axis of the single-pile bucket foundation unit 3 and the horizontal plane;

[0047] A pressure regulating part connected to the angle sensor and used to control the negative pressure of the chamber gas on the side of the acute angle to be less than the negative pressure of the chamber gas on the side of the obtuse angle when the current angle detected by the angle sensor is not a right angle.

[0048] In practical applications, the angle sensor detects the angle between the axis of the single-pile bucket foundation unit 3 and the horizontal plane, that is, detects the verticality of the single-pile bucket foundation unit 3. When the angle between the axis of the single-pile bucket foundation unit 3 and the horizontal plane is not a right angle, the axis of the single-pile bucket foundation unit 3 is not vertical. The pressure regulating part adjusts the negative pressure of the chamber gas in different directions. Specifically, it controls the negative pressure of the chamber gas on the side of the acute angle to be less than the negative pressure of the chamber gas on the side of the obtuse angle. Then, the distance of the wellhead platform on the side of the acute angle sinking downward is large, and the distance of the wellhead platform on the side of the obtuse angle sinking downward is small. That is, the axis of the single-pile bucket foundation unit 3 rotates from the acute angle side to the obtuse angle side by an angle, and the platform is lifted by a set distance on the acute angle side relative to the obtuse angle side, so as to adjust the axis of the single-pile bucket foundation unit 3 to be vertical and level the wellhead platform.

[0049] In the above embodiments, the leveling of the single-pile bucket foundation unit 3 is achieved by using the negative pressure effect, ensuring the verticality of the single-pile bucket foundation unit 3, enhancing the platform stability, and realizing rapid and accurate platform leveling.

[0050] Based on the above respective embodiments, the pressure regulating part includes:

[0051] A pressure sensor for detecting the negative pressure of the gas in each chamber;

[0052] A calculation unit connected to the pressure sensor and used to calculate the required negative pressure of the gas in each chamber when the axis of the single-pile bucket foundation unit 3 rotates to the vertical direction when the current angle detected by the angle sensor is not a right angle;

[0053] A pressure regulating valve connected to the calculation unit and used to pressurize or depressurize each chamber according to the negative pressure calculated by the calculation unit.

[0054] In practical applications, the pressure regulating device includes a pressure sensor, a calculation unit and a pressure regulating valve. The pressure sensor detects the negative pressure value of the gas in each cabin and sends the negative pressure information to the calculation unit. The calculation unit receives the negative pressure information and calculates the rotation of the axis of the single pile bucket base unit 3 to the vertical direction according to the current angle between the axis of the single pile bucket base unit 3 and the horizontal plane detected by the angle sensor, that is, the angle between the axis of the single pile bucket base unit 3 and the horizontal plane is 90°, the required gas negative pressure value in each cabin, and sends the negative pressure distribution information to the pressure regulating valve. The pressure regulating valve pressurizes or depressurizes the required gas negative pressure in each cabin calculated by the calculation unit, adjusts the axis of the single pile bucket base unit 3 to be vertical, levels the wellhead platform, enhances the stability of the platform, and realizes fast and accurate platform leveling.

[0055] In a preferred embodiment, a mounting hole 5 is provided on the upper sealing plate 6 of the single pile barrel foundation unit 3, and the pressure regulating valve is installed in the mounting hole 5. Optionally, a cover plate is connected to the opening of the mounting hole 5 to protect the pressure regulating valve and reduce seawater erosion.

[0056] Furthermore, the center of the mounting hole 5 is on a dividing circle with the water-blocking barrel 7 as the center, the mounting hole 5 is at the same left and right position from the corresponding cabin, the position of each pressure regulating valve for pressurizing or depressurizing the cabin is consistent, the standard for negative pressure detection and adjustment in each cabin is the same, the judgment standard is unified, the control accuracy is high, and fast and accurate platform leveling can be achieved.

[0057] On the basis of the above-mentioned embodiments, the closed barrel compartment is divided into a plurality of compartments by a plurality of vertical support plates 8 , and the extension lines of the support plates 8 pass through the center of the watertight barrel 7 .

[0058] In a specific embodiment, a plurality of support plates 8 are provided in the closed barrel cabin. The support plates 8 are connected to the inner wall of the base barrel 4 on one side and the outer wall of the water-blocking barrel 7 on the other side in the vertical direction. The upper end is connected to the upper sealing plate 6 and the lower end is connected to the bottom surface of the base barrel 4, so that the water-blocking ring is divided into a plurality of cabins. Along the radial direction of the water-blocking ring, that is, through the center of the circle of the base barrel 4, the water-blocking ring is subjected to a relatively uniform force, which reduces the concentrated stress and increases the strength. It should be noted that the plurality of support plates 8 can be evenly distributed, and the space of each cabin is the same; or they can be unevenly distributed, for example, the number of support plates 8 arranged on the windward side and the leeward side is large, the cabin space is smaller, the cabin negative pressure adjustment range is large, the force is large, and the control is more precise; the number of support plates 8 arranged on the gentle surface between the windward side and the leeward side is small, the negative pressure adjustment is relatively gentle, the cabin negative pressure adjustment range is small, the force is small, and the adjustability is small.

[0059] The support plate 8 can be a whole plate, dividing the cabin into independent spaces. By separately controlling the negative pressure of each cabin, the negative pressure of the entire closed barrel cabin can be adjusted, which is more convenient for adjustment. At this time, the support plate 8 is connected to the base barrel 4 and the water separation barrel 7 by welding, and the sealing performance is better. The support plate 8 can also be support ribs, and the cabins are connected. The negative pressure of the entire closed barrel cabin is adjusted according to the orientation.

[0060] Based on the above various embodiments, the inner wall of the water separation barrel 7 and the outer wall of each water separation pipe 11 are connected by a diagonal brace 12, and the extension line of the diagonal brace 12 passes through the centers of the water separation barrel 7 and the water separation pipe 11.

[0061] In a specific embodiment, the diagonal brace 12 connects the water separation barrel 7 and the water separation pipe 11, thereby realizing the connection between the water separation pipe 11 and the base barrel 4. The diagonal brace 12 can be a vertical whole plate, providing a large support force and stable support force from top to bottom; it can also be multiple transverse diagonal ribs, and the transverse diagonal ribs are arranged at intervals along the height direction of the base barrel 4, saving materials and reducing costs. Optionally, the intervals between adjacent diagonal ribs are equal, and the water separation barrel 7 and the water separation pipe 11 are uniformly stressed vertically, improving stability.

[0062] Since the connection stability is the weakest at the farthest point of the water separation pipe 11 from the center of the water separation barrel 7, the diagonal brace 12 is arranged at the farthest point of the water separation pipe 11 from the center of the water separation barrel 7, that is, at the intersection of the center line connecting the water separation barrel 7 and the water separation pipe 11 and the water separation pipe 11. At this position, the distance from the water separation pipe 11 and the water separation barrel 7 is the closest, shortening the length of the diagonal brace 12 and strengthening the water separation pipe 11. The diagonal brace 12 is along the diameter direction of the water separation pipe 11, consistent with the tangential force direction, and the connection point is not easily disconnected.

[0063] Under extreme conditions, the diagonal brace 12 approaches zero infinitely, and the water separation pipe 11 is internally tangent to the water separation barrel 7. The connection area is larger, the connection is firm, the diagonal brace 12 is omitted, and the structure is simplified.

[0064] Based on the above various embodiments, a plurality of partition plates 9 are provided in the water separation barrel 7. The partition plates 9 divide the water separation barrel 7 into a plurality of water separation areas. A water separation pipe 11 is provided in each water separation area, and the centers of the water separation pipes 11 are distributed on the pitch circle with the center of the water separation barrel 7 as the center. The support plate 8 and the corresponding partition plate 9 are on the same straight line.

[0065] In a specific embodiment, the water separation pipes 11 are placed in separate water separation areas, reducing the mutual interference between the water separation pipes 11. The radii of the plurality of water separation pipes 11 are the same and can be arranged in a water separation barrel 7, and the radius of the water separation barrel 7 can be minimized as much as possible. The water separation pipes 11 are dispersed and concentrated, and the connection is more convenient, enhancing the stability and durability of the water separation pipes 11.

[0066] Based on the above embodiments, the extension lines of the support plate 8 and the partition plate 9 pass through the center of the foundation barrel 4, and the partition plates 9 on the opposite sides are connected, so that the support plate 8 and the partition plate 9 penetrate the diameter of the foundation barrel 4, with a large support range and continuous support force, enhancing the overall stability and ensuring the strength and stiffness of the riser 11.

[0067] Based on the above embodiments, the riser 11 is connected to the partition plate 9 through the cross brace 10. The cross brace 10 is perpendicular to the partition plate 9, and the connection points of the partition plate 9 with the cross braces 10 on both sides coincide.

[0068] In a specific embodiment, the cross brace 10 connects the partition plate 9 and the riser 11, increasing the number of connection points of the riser 11, providing additional support, and enhancing the strength and stiffness of the riser 11.

[0069] The cross brace 10 is perpendicular to the partition plate 9, and the cross brace 10 passes through the diameter of the riser 11. The connection distance between the riser 11 and the partition plate 9 is the shortest, shortening the length of the cross brace 10, with a relatively large torque, and it is not easy for the riser 11 and the partition plate 9 to be torsionally deformed.

[0070] The connection points of the partition plate 9 with the cross braces 10 on both sides coincide, that is, the connection line of the centers of the risers 11 on both sides is perpendicular to the partition plate 9. The cross brace 10 is supported by the cross brace 10 and the partition plate 9 on the opposite side at the same time, with enhanced support strength; the partition plate 9 can be connected to the cross braces 10 on both sides at the same time, simplifying the connection process.

[0071] Based on the above embodiments, the aspect ratio of the length to the diameter of the foundation barrel 4 is set to 2:1, and the diameter of the foundation barrel 4 is greater than or equal to 5 meters.

[0072] In practical applications, the aspect ratio refers to the ratio of the length to the diameter of the single-pile bucket foundation unit 3. The length of the single-pile bucket foundation unit 3 is twice its diameter, and the bucket diameter is not less than 5 meters. At this time, the length of the single-pile bucket foundation unit 3 is not less than 10 meters. The ratio of the length to the diameter is increased compared with the aspect ratio in the prior art, increasing the length of the single-pile bucket foundation unit 3 sinking into the seabed, providing sufficient buoyancy and stability for the platform, and at the same time providing sufficient space for the internal support structure and equipment; it can increase the buoyancy and flexural resistance of the single-pile bucket foundation unit 3, helping to improve the stability of the platform.

[0073] The present utility model also provides a construction method for sinking and installing the single-pile bucket-shaped foundation wellhead platform according to any one of the above, including:

[0074] Hoist the single-pile bucket-shaped foundation wellhead platform into the water, and let the single-pile bucket foundation unit 3 sink to the seabed by its own weight;

[0075] At the same time, adjust the pressures of multiple pressure regulating valves to release the internal pressure of the closed barrel cabin to continue sinking;

[0076] Adjust the pressure of the pressure regulating valve respectively to level the simple wellhead platform of the single-pile bucket foundation.

[0077] Specifically, the processing and manufacturing of the simple wellhead platform of the movable single-pile bucket foundation are completed on land, and the prefabrication of the pressure regulating valve and the installation of the pressure regulating valve are completed; a layer of concrete is poured at the bottom of the riser unit 2 to form the in-pile concrete plug 13.

[0078] Carry the simple wellhead of the movable single-pile bucket foundation and the pressure regulating valve to the designated construction sea area.

[0079] The crane ship hoists the simple wellhead platform of the movable single-pile bucket foundation into the water, and the single-pile bucket foundation unit 3 sinks to the seabed by its own weight.

[0080] After the self-weight sinking stops, the pressure regulating valves are opened simultaneously. By adjusting the pressure of the pressure regulating valves, the internal pressure of the foundation bucket 4 is released, and the foundation bucket 4 continues to sink by relying on negative pressure.

[0081] After the simple wellhead of the movable single-pile bucket foundation sinks to the predetermined depth by relying on negative pressure, adjust the pressure of the pressure regulating valve to level the simple wellhead platform of the jacket-type single-pile bucket foundation to ensure the verticality of the pile body.

[0082] After the single-pile penetration construction is completed, use the drilling platform to conduct casing operation. Use the drill bit to drill the riser 11 into the formation, and break it relying on the drill bit when encountering the concrete plug to realize the casing running.

[0083] After the operation in this sea area is completed, adjust the pressure regulating valve simultaneously. Through the negative pressure effect, realize the efficient pile pulling of the foundation bucket 4, and further move to the next operation sea area. Cycle in turn to realize the rolling development of the simple wellhead platform of the movable single-pile bucket foundation among multiple marginal oil fields.

[0084] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same and similar parts among the various embodiments, refer to each other.

[0085] The above has introduced the simple wellhead platform of the single-pile bucket foundation provided by the present utility model in detail. Specific examples are used in this article to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model. It should be pointed out that for those of ordinary skill in the art in this technical field, without departing from the principle of the present utility model, several improvements and modifications can still be made to the present utility model, and these improvements and modifications also fall within the protection scope of the claims of the present utility model. Therefore, the present utility model will not be limited to these embodiments shown in this article, but will conform to the widest scope consistent with the principles and novel features disclosed in this article.

Claims

1. A single pile barrel foundation wellhead platform for offshore oil field development, characterized in that: It comprises a single pile barrel base unit (3), a watertight pipe unit (2) installed in the single pile barrel base unit (3), and a wellhead support module (1) arranged on the top of the watertight pipe unit (2), the bottom of the watertight pipe unit (2) directly passes through the bottom of the single pile barrel base unit (3), the bottom of the watertight pipe unit (2) is provided with a detachable sealing plug, and a closed barrel compartment is enclosed between the single pile barrel base unit (3) and the watertight pipe unit (2), and a pressure regulating device is installed on the single pile barrel base unit (3) for pressurizing the closed barrel compartment to make it sink or depressurizing it to make it float.

2. The single pile barrel foundation wellhead platform according to claim 1, characterized in that: The watertight pipe unit (2) includes a plurality of watertight pipes (11) and a watertight barrel (7) arranged on the periphery of all the watertight pipes (11); the base barrel (4) of the single pile barrel base unit (3) and the watertight barrel (7) are concentric; the closed barrel compartment is a watertight ring between the base barrel (4) and the watertight barrel (7); the watertight ring includes a plurality of independently closed chambers in the circumferential direction; each of the chambers is connected to an independent pressure regulating device; the single pile barrel-shaped foundation wellhead platform is leveled by adjusting the pressure values ​​of the pressure regulating devices in different directions.

3. The single pile barrel foundation wellhead platform according to claim 2, characterized in that: The voltage regulating device comprises: An angle sensor for detecting a current angle between the axis of the monopile barrel foundation unit (3) and a horizontal plane; A pressure regulating unit connected to the angle sensor and used for controlling the negative pressure of the cabin gas on the side of the acute angle to be lower than the negative pressure of the cabin gas on the side of the obtuse angle when the current angle detected by the angle sensor is not a right angle.

4. The single pile barrel foundation wellhead platform according to claim 3 is characterized in that: The voltage regulating unit comprises: A pressure sensor for detecting the negative pressure of gas in each of the cabins; A calculation unit connected to the pressure sensor and used for calculating the amount of negative gas pressure required in each of the cabins when the axis of the single pile barrel foundation unit (3) rotates to a vertical direction when the current angle detected by the angle sensor is not a right angle; A pressure regulating valve connected to the calculation unit and used to pressurize or reduce pressure in each of the cabins according to the negative pressure calculated by the calculation unit.

5. The single pile barrel foundation wellhead platform according to claim 2, characterized in that: The closed barrel compartment is divided into a plurality of compartments by a plurality of vertical support plates (8), and the extension lines of the support plates (8) pass through the center of the watertight barrel (7).

6. The single pile barrel foundation wellhead platform according to claim 5, characterized in that: The inner wall of the water-blocking barrel (7) and the outer wall of each water-blocking pipe (11) are connected via an inclined brace (12), and the extension line of the inclined brace (12) passes through the center of the water-blocking barrel (7) and the water-blocking pipe (11).

7. The single pile barrel foundation wellhead platform according to claim 6, characterized in that: The water-blocking barrel (7) and the water-blocking pipe (11) are internally connected.

8. The single pile barrel foundation wellhead platform according to claim 7, characterized in that: A plurality of partition plates (9) are arranged in the water-proof barrel (7), and the partition plates (9) divide the water-proof barrel (7) into a plurality of water-proof areas. A water-proof pipe (11) is arranged in each water-proof area, and the center of the water-proof pipe (11) is distributed on a pitch circle with the center of the water-proof barrel (7). The support plate (8) and the corresponding partition plate (9) are on a straight line, and the extension lines of the support plate (8) and the partition plate (9) pass through the center of the base barrel (4).

9. The single pile barrel foundation wellhead platform according to claim 8, characterized in that: The watertight pipe (11) is connected to the partition plate (9) via a cross brace (10), the cross brace (10) is perpendicular to the partition plate (9), and the connection points of the partition plate (9) and the cross braces (10) on both sides coincide with each other.

10. The single pile bucket foundation wellhead platform according to any one of claims 2 to 9, characterized in that: The length-to-diameter ratio of the basic barrel (4) is set to 2:1, and the diameter of the basic barrel (4) is greater than or equal to 5 meters.

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