CN115874971A - Suction anchor wellhead assembly - Google Patents

Abstract

The invention discloses a suction anchor wellhead device, which comprises a suction main barrel, a skirt-type structure body, a central guide pipe and an inner plate, wherein the suction main barrel is provided with a suction hole; the skirt structure is axially movably arranged outside the suction main barrel; the central conduit is configured to penetrate the top surface of the suction main barrel at the top end; the inner plate is axially movably arranged in the suction main barrel; a pressure regulating cavity is formed between the inner top surface of the suction main barrel and the inner plate, and a drain hole is arranged on the top surface of the suction main barrel; a first connecting hole is formed in the top surface of the suction main barrel, a second connecting hole is formed in the inner plate, a flexible conduit is arranged in the pressure regulating cavity, one end of the flexible conduit is connected with the first connecting hole, and the other end of the flexible conduit is connected with the second connecting hole; the suction anchor wellhead device can realize the normal installation of the suction anchor wellhead on the surface of an inclined seabed, and can avoid the seepage damage of a soil body caused by the injection of high-pressure water in the recovery stage of the suction anchor wellhead.

Description

A suction anchor wellhead device

technical field

The invention relates to the technical field of marine structure engineering, in particular to a suction anchor wellhead device.

Background technique

At present, the suction anchor wellhead widely used at home and abroad is a large-diameter drum structure with an open bottom and a closed top. It is generally made of steel. There is a water outlet hole connected to the pump system on the top of the drum. Central conduit for oil and gas resources. The drum cavity may have reinforcing rings or longitudinal stiffeners. Because of its characteristics of easy installation, large vertical bearing capacity and low impact on the environment, it is of great significance to the future commercial exploitation of offshore oil and gas resources.

Disadvantages of the current suction anchor wellhead:

1. At present, the suction anchor wellhead can only rely on its own weight and suction to penetrate the seabed vertically during the penetration stage. As for the inclined seabed soil, the suction anchor wellhead cannot be tilted during the installation process, which will make the suction anchor wellhead difficult to correct. It is not conducive to the exploitation of offshore oil and gas resources in the future.

2. When recovering the wellhead of the suction anchor, it is necessary to inject water into the wellhead and push the wellhead of the suction anchor out through the water pressure. If the water pressure is too high, it is easy to cause seepage damage to the soil inside the wellhead of the suction anchor, resulting in recovery failure.

Therefore, it is necessary to improve the current suction anchor wellhead.

Contents of the invention

In order to solve the above technical problems, the present invention provides a suction anchor wellhead device.

In order to solve the above problems, the present invention adopts the following technical solutions:

A suction anchor wellhead device, comprising a suction main barrel, a skirt structure, a central conduit and an inner plate; the suction main barrel is configured to have an open bottom and a horizontally closed top surface; the skirt structure can move axially It is arranged on the outside of the suction main tub; the central conduit is configured such that the top end passes through the top surface of the suction main tub, and the top end of the central conduit is fixedly connected to the top surface of the suction main tub; the inner plate can configured to move axially in the main suction barrel, and the inner plate is configured to be slidably connected with the central conduit;

Wherein, a pressure regulating chamber is formed between the inner top surface of the suction main bucket and the inner plate, and the top surface of the suction main bucket is provided with drainage holes, and the drainage holes communicate with the pressure regulating chamber. The inner plate is configured to move up and down along the axial direction of the suction main barrel according to the internal pressure of the pressure regulating chamber;

Wherein, the top surface of the suction main barrel is provided with a first connection hole, the inner plate is provided with a second connection hole, and a flexible conduit is provided in the pressure regulating cavity, and one end of the flexible conduit is connected to the first The connecting hole is connected, and the other end of the flexible conduit is connected to the second connecting hole.

In the suction anchor wellhead device provided in at least one embodiment of the present disclosure, a lifting ring is arranged on the top surface of the suction main barrel.

In the suction anchor wellhead device provided in at least one embodiment of the present disclosure, the inner wall of the suction main barrel is fixedly equipped with guide strips, the inner plate is provided with guide grooves that match the guide strips, and the inner plate The guide bar and the guide groove are slidably connected.

In the suction anchor wellhead device provided in at least one embodiment of the present disclosure, the guide bar is configured with a limiting plate, the limiting plate is perpendicular to the central axis of the suction main barrel, and the limiting plate is used to place the An inner panel is confined within the suction main tub.

The suction anchor wellhead device provided in at least one embodiment of the present disclosure further includes: a positioning component;

Wherein, the skirt structure is provided with positioning perforations, and the outside of the main suction barrel is provided with positioning blind holes, and the positioning component is at least partially inserted into the positioning perforations and positioning blind holes in sequence.

In the suction anchor wellhead device provided in at least one embodiment of the present disclosure, the suction main barrel and the central conduit form a concentric structure.

In the suction anchor wellhead device provided in at least one embodiment of the present disclosure, the skirt structure includes: a tubular portion and an annular portion; the tubular portion is configured to form a concentric structure with the suction main barrel; the annular The part is fixedly arranged at the bottom end of the tubular part;

Wherein, the positioning perforation is located on the tubular portion.

In the suction anchor wellhead device provided in at least one embodiment of the present disclosure, a guiding hole is configured in the middle of the inner plate, the central conduit passes through the guiding hole, and the central conduit and the inner plate are slidably connected through the guiding hole.

In the suction anchor wellhead device provided in at least one embodiment of the present disclosure, the limiting plate is located at the bottom of the suction main barrel.

The beneficial effects of the invention are: compared with the traditional structure, by adding a skirt structure that can move up and down, the upright installation of the suction anchor wellhead on the surface of the inclined seabed can be realized. In addition, the addition of an inner plate that can move up and down can avoid the seepage damage of the soil caused by the injection of high-pressure water during the recovery stage of the suction anchor wellhead.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

Fig. 1 is a schematic structural view of a suction anchor wellhead device of the present invention.

Fig. 2 is a perspective view of a suction anchor wellhead device of the present invention.

Fig. 3 is a cross-sectional view of a suction anchor wellhead device of the present invention.

Fig. 4 is a partial sectional view of a suction anchor wellhead device of the present invention.

Fig. 5 is a partial sectional view of a suction anchor wellhead device of the present invention.

Fig. 6 is a state diagram of a suction anchor wellhead device of the present invention when it touches an inclined seabed.

Fig. 7 is a state diagram of a suction anchor wellhead device of the present invention when it penetrates into soil perpendicular to the seabed.

In the picture:

10. Suction main barrel; 11. Pressure regulating chamber; 12. Drainage hole; 13. First connecting hole; 14. Lifting ring; 15. Guide bar; 16. Limiting plate; 17. Positioning blind hole;

20. Skirt structure; 21. Positioning perforation; 22. Tube shape part; 23. Ring part;

30. Central catheter;

40. Inner panel;

50. Flexible conduit.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments with reference to the drawings in the embodiments. Obviously, the described embodiments are only some of the embodiments, not all of the embodiments.

Example

As shown in Figures 1 to 5, a suction anchor wellhead device includes a suction main barrel 10, a skirt structure 20, a central conduit 30 and an inner plate 40; the suction main barrel 10 is configured to have an open bottom and a horizontally closed top surface; The skirt structure 20 is arranged axially movable on the outside of the suction main tub 10; the central conduit 30 is configured such that the top end of the central conduit 30 passes through the top surface of the suction main tub 10, and the top end of the central conduit 30 is fixedly connected to the top surface of the suction main tub 10; The inner plate 40 is arranged axially movable in the suction main barrel 10 , and the inner plate 40 is configured to be slidably connected with the central conduit 30 ;

In this embodiment, a pressure regulating chamber 11 is formed between the inner top surface of the suction main bucket 10 and the inner plate 40, and the top surface of the suction main bucket 10 is provided with a drainage hole 12, and the drainage hole 12 communicates with the pressure regulating chamber 11. The inner plate 40 is configured to move up and down axially along the suction main tub 10 according to the inner pressure of the pressure regulating chamber 11 .

In this embodiment, a first connecting hole 13 is arranged on the top surface of the main suction barrel 10, a second connecting hole (not shown) is arranged on the inner plate 40, a flexible conduit 50 is arranged in the pressure regulating chamber 11, and the flexible conduit One end of the flexible conduit 50 is connected to the first connecting hole 13, and the other end of the flexible conduit 50 is connected to the second connecting hole. Exemplarily, the flexible conduit adopts a rubber tube, which has good elastic deformation capability and has less influence on the movement of the inner plate.

In this embodiment, a suspension ring 14 is disposed on the top surface of the main suction bucket 10 , and the suspension ring 14 is fixedly connected with the main suction bucket 10 .

In this embodiment, the inner wall of the main suction barrel 10 is fixedly equipped with guide strips 15, and the inner plate 40 is provided with guide grooves (not shown) that match the guide strips 15, and the inner plate 40 passes through the guide strips 15 and guide Groove sliding connection. The activity stability of the inner plate 40 is better, and the situation of rollover is not easy to occur.

In this embodiment, the guide bar 15 is configured with a limit plate 16, the guide bar 15 is fixedly connected to the limit plate 16, the limit plate 16 is perpendicular to the central axis of the suction main bucket 10, and the limit plate 16 is used to place the inner plate 40 is confined within the suction main bucket 10. By configuring the limiting plate 16, the inner plate 40 can be effectively prevented from moving out of the main suction barrel 10, and the stability of the entire device can be effectively improved.

In this embodiment, the main suction barrel 10 and the central conduit 30 form a concentric structure.

In this embodiment, the skirt structure 20 includes a tubular portion 22 and an annular portion 23; the tubular portion 22 is configured to form a concentric structure with the suction main bucket 10; the annular portion 23 is fixedly disposed at the bottom of the tubular portion 22 end.

In this embodiment, a guide hole (not shown) is disposed in the middle of the inner plate 40 , the central conduit 30 passes through the guide hole, and the central conduit 30 and the inner plate 40 are slidably connected through the guide hole.

In this embodiment, the limiting plate 16 is located at the bottom of the main suction tub 10 .

In this embodiment, the suction anchor wellhead device also includes a positioning component (not shown), the tubular portion is configured with a positioning perforation 21, and two sets of positioning blind holes 17 are disposed on the outside of the suction main barrel 10, and the two sets of positioning blind holes are respectively located in The top end and the bottom end of the main suction barrel 10 and the positioning components are sequentially inserted into the positioning through holes 21 and the positioning blind holes 17 . Exemplarily, the positioning component adopts a pin shaft.

The arrangement of each main structure of the suction anchor wellhead device has been known from the above, but in order to more clearly reflect the use method of the suction anchor wellhead device, the following will explain the use method of the suction anchor wellhead device, and the usage method is as follows:

Lowering the sloped seabed surface process:

The skirt structure is fixed by the positioning part at this time and cannot move; as shown in Figure 6, when the device touches the inclined seabed, under the action of its own weight, the device will rotate around the point A that initially contacts the seabed. The state shown in Figure 7 can be achieved, and the installation can be carried out on the inclined seabed and perpendicular to the seabed. After the installation, the constraints of the positioning parts are released, so that the skirt structure can move up and down along the suction main barrel.

Installation phase:

Stage 1. Self-gravity penetration stage. At this time, the skirt structure and the inner plate move relatively upward with the downward penetration of the suction main barrel until the self-gravity penetration stage ends.

Stage 2. The vacuum pump is connected to the drain hole, and the water in the pressure regulating chamber is pumped out, and a negative pressure is formed inside the suction main barrel, and the suction main barrel penetrates downward. At this time, the inner plate is upward under the action of the pressure difference. Move until the inner plate is close to the inner top surface of the suction main barrel, and the second stage is over. After the end, the drain hole is connected to the vacuum pump, but it does not work and is in a sealed state.

Stage 3. The drain hole has been blocked by the inner plate and cannot continue to drain water. At this time, use a vacuum pump to connect with the first connecting hole, and continue to pump water outward through the vacuum pump, so that a negative pressure is formed under the inner plate and continues to penetrate to complete the suction. The final installation of the anchor wellhead, after the installation is completed, the skirt structure is fixed on the top of the suction main barrel through the positioning parts.

Recovery phase:

In order to prevent soil damage caused by soil seepage induced by water injection, we add an inner plate inside the suction main bucket to avoid direct contact between the injected high-pressure water and the soil inside the bucket. The specific operation steps: inject high-pressure water into the pressure regulating chamber through the drainage hole, move the inner plate downward, push out the soil in the suction main bucket, and finally dismantle the equipment.

Although the embodiments of the present application have been shown and described above, the scope of protection of the present invention is not limited thereto, and any change or replacement that is not thought of through creative work shall be covered within the scope of protection of the present invention; unless No element, act, or instruction used herein should be construed as critical or essential unless expressly stated.

Claims (10)

1. A suction anchor wellhead assembly, comprising:

a suction main tub configured to have an open bottom and a horizontally closed top;

a skirt structure axially movably disposed outside the suction main tub;

the top end of the central guide pipe penetrates through the top surface of the suction main barrel, and the top end of the central guide pipe is fixedly connected with the top surface of the suction main barrel; and

an inner plate axially movably disposed within the suction main tub, the inner plate configured to slidingly couple with the central duct;

a pressure regulating cavity is formed between the inner top surface of the suction main barrel and the inner plate, a drain hole is arranged on the top surface of the suction main barrel and is communicated with the pressure regulating cavity, and the inner plate is configured to move up and down along the axial direction of the suction main barrel according to the internal pressure of the pressure regulating cavity;

the top surface of the suction main barrel is provided with a first connecting hole, the inner plate is provided with a second connecting hole, the pressure regulating cavity is provided with a flexible conduit, one end of the flexible conduit is connected with the first connecting hole, and the other end of the flexible conduit is connected with the second connecting hole.

2. The suction anchor wellhead assembly of claim 1 wherein the top surface of the suction primary bucket is provided with a lifting ring.

3. The suction anchor wellhead assembly according to claim 1, wherein the inner wall of the suction main barrel is fixedly provided with a guide strip, the inner plate is provided with a guide groove matched with the guide strip, and the inner plate is slidably connected with the guide groove through the guide strip.

4. The suction anchor wellhead assembly of claim 3, wherein the guide bars are configured with a limiting plate perpendicular to the central axis of the suction main barrel, the limiting plate being configured to limit the inner plate within the suction main barrel.

5. A suction anchor wellhead assembly as claimed in claim 4 further including:

a positioning member;

the skirt type structure body is provided with a positioning through hole, the outer side of the suction main barrel is provided with a positioning blind hole, and the positioning part is at least partially inserted into the positioning through hole and the positioning blind hole in sequence.

6. A suction anchor wellhead assembly as claimed in claim 1 in which the main suction bucket and the central conduit are of concentric construction.

7. A suction anchor wellhead as claimed in claim 5 in which the skirt structure includes:

a pipe part configured to form a concentric structure with the suction main barrel; and

an annular portion fixedly disposed at a bottom end of the tubular portion;

wherein the positioning perforation is located on the tube-shaped part.

8. A suction anchor wellhead assembly as claimed in claim 1 in which the inner plate is provided with a guide bore in the middle thereof through which the central conduit passes, the central conduit and inner plate being slidably connected by the guide bore.

9. A suction mooring wellhead assembly as claimed in claim 3 wherein said restriction plate is located at the bottom of said suction main drum.

10. The suction anchor wellhead assembly according to claim 5, wherein there are two sets of blind positioning holes, the two sets of blind positioning holes being located at the top and bottom ends of the suction main bucket, respectively.

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