Suction anchor attitude stabilization auxiliary device and suction anchor penetration method

Abstract

The invention discloses an auxiliary device for stabilizing the posture of a suction anchor and a method for penetrating the suction anchor into a seabed. The auxiliary device provided by the invention is composed of a top cover 1, a middle cylinder 2 and a bottom substrate 3. The top cover 1 is connected with the inner wall of one end of the middle cylinder 2, and the bottom substrate 3 is connected with the outer wall of the other end of the middle cylinder 2. Wherein the top cover of the auxiliary device for posture stabilization of the suction anchor is composed of a top plate 1-1, a middle wire through hole 1-3, peripheral water through holes 1-2 and a bottom magnetic device 1-4, the middle cylinder body 2 is composed of a cylinder body 2-1, a wedge 2-3 and a water through hole 2-2, and the bottom substrate 3 is composed of a bottom plate 3-1 and a middle open hole 3-2 and can control the descending posture of the suction anchor; the suction anchor is kept stable when making contact with the seabed, the penetration success rate of the suction anchor is increased, and the anchoring effect of the suction anchor is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of suction anchor applications, and specifically relates to a suction anchor attitude stabilization auxiliary device and a method for a suction anchor to penetrate into the seabed. Background Art

[0002] Deep-sea floating platforms include wind farms, oil and gas fields, and deep-sea submerged platforms. A suction anchor is a core technical equipment for the mooring system of deep-sea floating facilities. The main function of the suction anchor is to fix offshore floating facilities to the seabed. The structure of the suction anchor generally includes parts such as a cylinder body, a top cover, a lifting lug, and an anchor chain. When in use, the suction anchor is suspended to the seabed and sinks into the silt layer to a certain depth under its own weight. The seawater in the barrel is discharged from the suction holes through a suction pump arranged at the top of the suction anchor to form an internal and external pressure difference, and the suction anchor is further pressed into the silt layer until the lower part of its top cover contacts the mud surface and is embedded in the mud layer.

[0003] The attitude control of the suction anchor during the descent process is crucial. Affected by ocean currents, sea waves, uneven seabed topography, or uneven self-weight distribution, the posture of the suction anchor will tilt or shift. Improper attitude control of the suction anchor may cause instability when the suction anchor contacts the seabed, affecting the anchoring effect of the suction anchor. Summary of the Invention

[0004] To improve the above technical problems, the technical solution of the present invention provides a suction anchor attitude stabilization auxiliary device and a method for a suction anchor to penetrate into the seabed, which are used for the suction anchor on a deep-sea floating platform to control the attitude of the suction anchor when penetrating into the seabed, so as to effectively improve the installation success rate of the suction anchor.

[0005] The suction anchor attitude stability assistance device provided by a technical solution of the first aspect of the present invention, hereinafter referred to as the assistance device, includes a top cover (1), a middle cylinder (2) and a bottom substrate (3). Specifically, the top cover (1) includes a top plate (1-1) and a magnetic device (1-4); the magnetic device (1-4) is connected to the top plate (1-1) and is located inside the middle cylinder (2). The top plate (1-1) is provided with a plurality of circumferential water through holes (1-2) and a middle wire through hole (1-3); the magnetic device (1-4) is arranged at intervals with the circumferential water through holes (1-2) and the middle wire through hole (1-3). The middle wire through hole (1-3) is used to pass through the cable connecting the suction anchor and the deep-sea floating platform, and the magnetic device (1-4) is used for magnetic connection with the suction anchor; the middle cylinder (2) includes a cylinder body (2-1) and a wedge (2-3). The number of wedges (2-3) is multiple, and each wedge (2-3) is conical. The large end of the wedge (2-3) is connected to the inner wall of the cylinder body (2-1), and the small end of the wedge (2-3) points to the central axis of the cylinder body (2-1), so that the wedge (2-3) is arranged along the radial direction of the cylinder body (2-1). The multiple wedges (2-3) are circumferentially and arrayed inside the cylinder body (2-1). The cylinder body (2-1) is provided with a plurality of water through holes (2-2), and the plurality of water through holes (2-2) are circumferentially and arrayed inside the cylinder body (2-1) and are arranged at intervals with the wedges (2-3); the top plate (1-1) and the bottom substrate (3) are respectively arranged at the axial two ends of the cylinder body (2-1). The top plate (1-1) covers the opening at one end of the cylinder body (2-1), and the bottom substrate (3) includes an annular disc structure, and the inner ring surface of the annular disc structure is connected to the outer wall of the cylinder body (2-1); wherein, both the wedge (2-3) and the bottom substrate (3) are made of flexible materials. A suction pump is provided on the suction anchor. The suction pump can be integrated on the suction anchor.

[0006] In the above technical solution, the cylinder body (2-1) is provided with an inner cavity capable of accommodating the suction anchor and its suction pump.

[0007] In the above technical solution, the middle wire through hole (1-3) is arranged at the central position of the top plate (1-1), and the plurality of circumferential water through holes (1-2) are arranged around the middle wire through hole (1-3).

[0008] In the above technical solution, the number of the magnetic devices (1-4) is multiple, and the multiple magnetic devices (1-4) are circumferentially and arrayed. The middle wire through hole (1-3) is arranged at the center of the circumferential array for avoiding the space for the cable to pass through.

[0009] In other technical solutions, the magnetic device (1-4) is annular and is provided with a through hole. The middle wire through hole (1-3) is communicated with the through hole for the cable to pass through.

[0010] In addition, for the case where the magnetic device (1-4) includes an electromagnet and a coil, the cable for supplying current to the electromagnet is also connected to the coil on the electromagnet through the intermediate wire passing hole (1-3).

[0011] In the above technical solution, the number of the wedges (2-3) is the same as the number of the water passing holes (2-2). The circumferential array formed by the multiple wedges (2-3) has the same distribution pattern as the circumferential array of the multiple water passing holes (2-2). Along the circumferential direction of the cylinder body (2-1), one wedge (2-3) is provided between two adjacent water passing holes (2-2) arranged adjacent to each other, and one water passing hole (2-2) is provided between two adjacent wedges (2-3) arranged adjacent to each other.

[0012] In the above technical solution, the connection force between the magnetic device (1-4) and the suction anchor is greater than the buoyancy of the suction anchor attitude stabilizing auxiliary device and less than the difference between the initial negative pressure formed after the suction pump of the suction anchor is turned on and the penetration resistance.

[0013] In the above technical solution, the annular disc-shaped structure is connected to the cylinder body (2-1) by means of hot melting.

[0014] In the above technical solution, the central axis of the annular disc-shaped structure is collinear with the central axis of the cylinder body (2-1).

[0015] In the above technical solution, the outer ring surface of the annular disc-shaped structure has a rounded corner shape.

[0016] In summary, the suction anchor attitude stabilizing auxiliary device provided by the present invention can at least have the following beneficial effects:

[0017] (1) The suction anchor attitude stabilizing auxiliary device provided by the present invention generally has a convex structure with a closed upper end and an open lower end. Water passing holes are arranged thereon to reduce the weight and allow water flow, reduce the impact of water flow, can be connected to the suction anchor through the magnetic device, and are separated when the suction anchor penetrates. The landing pose of the suction anchor can be corrected by the action of the outer shape structure, and the penetration success rate of the suction anchor can be greatly improved.

[0018] (2) The suction anchor attitude stabilizing auxiliary device controls the connection force with the suction anchor through the magnetic device, corrects the pose of the suction anchor through the bottom substrate, eliminates the complex inspection of the detection instrument and the manual adjustment and correction of the pose of the suction anchor, and ensures that the suction anchor can land on the seabed plane autonomously and stably.

[0019] (3) The auxiliary device provided by the present invention has a simple structure and is convenient to operate. The auxiliary device mainly ensures the vertical attitude when the suction anchor contacts the seabed through the physical structure, and has higher reliability in use compared with the electrical mechanism for attitude control.

[0020] A method for penetrating a suction anchor into a seabed provided by a technical solution of the second aspect of the present invention, referred to as a penetration method, comprises the following steps:

[0021] The suction anchor is placed in the middle cylinder of the suction anchor attitude stabilization auxiliary device, and the suction anchor attitude stabilization auxiliary device is abutted against the top of the suction anchor through a magnetic device;

[0022] Pass the cable of the suction anchor and the cable of the suction pump thereon through the cable hole on the top plate of the suction anchor attitude stabilization auxiliary device and connect them to the deep-sea floating platform;

[0023] The sharp wedges in the cylinder of the suction anchor posture stabilization auxiliary device are matched with the suction anchor by overfitting, so that all the sharp wedges are in contact with the outer wall of the suction anchor;

[0024] Turn on the magnetic device to magnetically connect the magnetic device to the suction anchor;

[0025] The suction anchor is released from the floating platform and lowered by its own weight; during the process of lowering by its own weight, the suction anchor is affected by the ocean current and its posture is shifted;

[0026] Before the suction anchor contacts the seabed, the bottom substrate of the suction anchor attitude stabilization auxiliary device contacts the seabed first, and guides the suction anchor attitude to be perpendicular to the seabed surface;

[0027] When the suction anchor contacts the seabed, the magnetic device maintains magnetic connection with the suction anchor; and the connection force of the magnetic connection is controlled to be greater than the buoyancy of the suction anchor attitude stabilization auxiliary device;

[0028] The suction pump is turned on to create a pressure difference between the inside and outside, so that the suction anchor sinks into the seabed through pressure; wherein the connection force of the magnetic connection generated by the magnetic device of the suction anchor attitude stabilization auxiliary device is smaller than the sinking force of the suction anchor, so that the suction anchor attitude stabilization auxiliary device is separated from the suction anchor;

[0029] The suction anchor is completely sunk into the seabed through pressure to achieve long-term anchoring; during the long-term anchoring process, the suction anchor attitude stabilization auxiliary device stays on the seabed.

[0030] In the above technical solution, after the suction anchor is completely sunk into the seabed by pressure, the following steps are also included:

[0031] Water is injected into the suction anchor through a suction pump, causing a pressure difference in the opposite direction to that in the process of sinking into the seabed, so that the suction anchor is pulled upward by the pressure difference, enters the cylinder cavity of the suction anchor attitude stabilization auxiliary device, and is connected to the suction anchor attitude stabilization auxiliary device through a magnetic device;

[0032] The suction anchor attitude stabilization auxiliary device together with the suction anchor is pulled upward through the cable and recovered into the deep-sea floating platform.

[0033] The technical solution of the second aspect of the present invention provides a method for a suction anchor to penetrate into the seabed. Since the attitude stabilization auxiliary device of any one of the technical solutions in the first aspect is used, the method for a suction anchor to penetrate into the seabed provided by the technical solution of the second aspect of the present invention has all the beneficial effects of any one of the technical solutions in the first aspect of the present invention, which will not be elaborated herein. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic structural diagram of the attitude stabilization auxiliary device of a suction anchor in an embodiment of the present invention.

[0035] Figure 2 It is a schematic cross-sectional structure diagram of the attitude stabilization auxiliary device of a suction anchor in an embodiment of the present invention.

[0036] Figure 3 It is a schematic internal structure diagram of the attitude stabilization auxiliary device of a suction anchor in an embodiment of the present invention.

[0037] Each label in the figure is: 1. top cover; 2. middle cylinder; 3. bottom substrate; 1-1. top plate; 1-2. surrounding water holes; 1-3. middle wire hole; 2-1. cylinder; 2-2. water holes; 2-3. wedge; 3-1. bottom plate; 3-2. middle opening. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0038] The following clearly and completely describes the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the protection scope of the present invention.

[0039] Some embodiments of the present invention provide an attitude stabilization auxiliary device for a suction anchor.

[0040] As Figures 1 to 3 shown, the attitude stabilization auxiliary device for a suction anchor provided in this embodiment is composed of a top cover 1, a middle cylinder 2 and a bottom substrate 3. The top cover 1 is connected to the inner wall of one end of the middle cylinder 2, and the bottom substrate 3 is connected to the outer wall of the other end of the middle cylinder 2. Among them, the top cover of the attitude stabilization auxiliary device for a suction anchor is composed of a top plate 1-1, a middle wire hole 1-3, surrounding water holes 1-2 and a bottom magnetic device 1-4. The middle cylinder 2 is composed of a cylinder 2-1, a wedge 2-3 and water holes 2-2. The bottom substrate 3 is composed of a bottom plate 3-1 and a middle opening 3-2.

[0041] In some specific embodiments, the top plate 1-1 is a circular top plate. The wire passing hole is in the center of the top plate 1-1 and serves as the wire passing hole for the large-eye cable and the electrical cable at the top of the suction anchor. The cable between the floating platform and the suction anchor is connected through the wire passing hole.

[0042] In some specific embodiments, the water passing holes 1-2 are through holes distributed around the wire passing hole and are evenly distributed around the wire passing hole.

[0043] In some specific embodiments, the cylinder body 2-1 is a cylindrical cylinder body and is fixed to the top cover by bolts or welding.

[0044] In some specific embodiments, the water passing holes 2-2 are through holes arranged in a circumferential array on the side wall of the cylinder body 2-1 and are offset from the wedge 2-3.

[0045] In some specific embodiments, the bottom substrate 3 of the suction anchor attitude stabilizing auxiliary device is a circular flexible disk, and the outermost side surface of the bottom substrate has a rounded corner shape.

[0046] In some specific embodiments, it is connected to the cylinder body by hot melting.

[0047] In some specific embodiments, as Figure 2 shown, the magnetic device 1-4 of the top cover 1 of the present invention is installed at the lower part of the top plate 1-1 by threads. A plurality of magnetic devices 1-4 are distributed in a circumferential manner. The suction anchor and the attitude stabilizing auxiliary device are connected by the magnetic device. The magnetic device is offset from the water passing hole, and the radius of the circumferential distribution is greater than the sum of the radius of the wire passing hole and the diameter of the magnetic device.

[0048] In some specific embodiments, as Figure 3 shown, the wedge 2-3 of the middle cylinder 2 of the suction anchor attitude stabilizing auxiliary device of the present invention is a conical flexible wedge with a rounded top and is arranged in a circumferential array inside the cylinder body and is connected to the cylinder body by bolts.

[0049] In some specific embodiments, there is one wire passing hole in the top cover, which is a circular through hole and is located at the center of the top cover.

[0050] In some specific embodiments, there are four water passing holes in the top cover, which are circular through holes and are distributed around the wire passing hole in a circumferential array manner. The circumferential array is coaxial with the wire passing hole.

[0051] In some specific embodiments, there are four bottom magnetic devices in the top cover, which are circular and are located at the lower part of the top cover and are connected to the top cover by threads. They are distributed around the wire passing hole in a circumferential array manner. The circumferential array is coaxial with the wire passing hole.

[0052] In some specific embodiments, the wire passing hole, the 4 water passing holes and the 4 magnetic devices in the top cover are arranged in a nine-square grid form around the wire passing hole.

[0053] In some specific embodiments, the cylinder of the middle cylinder is a cylindrical rigid cylinder, having the same diameter as the top cover and being coaxial. It is fixed to the top cover by bolts or welding, and the height of the cylinder is less than the height of the matching suction anchor.

[0054] In some specific embodiments, the water holes around the middle cylinder are circular through-holes, which are uniformly linearly arrayed from top to bottom. The linear array is circularly arrayed four times with the axis of the cylinder as the rotation axis.

[0055] In some specific embodiments, the wedge of the middle cylinder is a cone with a rounded top, made of a soft material, with the tip facing inwards. It is connected to the cylinder by bolts and is uniformly linearly arrayed from top to bottom. The linear array is circularly arrayed four times with the axis of the cylinder as the rotation axis.

[0056] In some specific embodiments, the bottom substrate is a circular flat plate with a hole in the middle. The diameter of the hole in the middle is the same as the diameter of the cylinder, and the hole and the original flat plate are coaxial, and the hole is coaxial with the cylinder.

[0057] In addition, some embodiments of the present invention also provide a method for a suction anchor to penetrate into the seabed, which is used to stabilize the posture of the suction anchor during the descent process, including the following steps:

[0058] a) The suction anchor posture stabilizing auxiliary device contacts or approaches the top of the suction anchor through the magnetic device on the top cover;

[0059] b) The cable of the large eye at the top of the suction anchor and the cable of the pump extend out through the wire passing hole in the center of the top plate of the suction anchor posture stabilizing auxiliary device and are connected to the floating platform;

[0060] c) The wedge of the cylinder of the suction anchor posture stabilizing auxiliary device cooperates with the suction anchor through an interference fit, and all the wedges are abutted against the side wall of the suction anchor;

[0061] d) Make the magnetic device on the top plate of the suction anchor posture stabilizing auxiliary device magnetically connected to the suction anchor. (The connection force is greater than the buoyancy of the suction anchor posture stabilizing auxiliary device and less than the difference between the initial negative pressure formed after the suction anchor starts the pump and the penetration resistance);

[0062] e) After installing the suction anchor posture stabilizing auxiliary device, the suction anchor is released from the floating platform and descends by its own weight;

[0063] f) During the process of the suction anchor descending by its own weight, its position and posture shift under the influence of the ocean current;

[0064] g) Before the suction anchor touches the seabed, the bottom substrate of the suction anchor posture stabilizing auxiliary device first touches the seabed and guides the position and posture of the suction anchor to be perpendicular to the seabed;

[0065] h) When the suction anchor touches the seabed, the attitude stability assist device of the suction anchor is connected to the suction anchor through a magnetic device;

[0066] i) The suction anchor turns on the integrated pump to create an internal and external pressure difference and sinks downward through the pressure. The magnetic force generated by the magnetic device of the attitude stability assist device of the suction anchor is less than the sinking force of the suction anchor, and the attitude stability assist device of the suction anchor is separated from the suction anchor;

[0067] j) The suction anchor is completely sunk into the seabed through pressure. During the long-term anchoring process, the attitude stability assist device of the suction anchor stays above the seabed;

[0068] k) During the extraction stage of the suction anchor, water is injected into it through the integrated pump to create a pressure difference in the opposite direction to that generated in step i. It is pulled out upward through the pressure difference and enters the cylinder cavity of the attitude stability assist device of the suction anchor, and is connected to the attitude stability assist device of the suction anchor again through the magnetic device;

[0069] l) The attitude stability assist device of the suction anchor and the suction anchor are pulled out upward through the cable and recovered into the floating platform.

[0070] In summary, the attitude stability assist device and penetration method of the suction anchor provided by the present invention can control the descending attitude of the suction anchor, make the suction anchor stable when it contacts the seabed, thereby improving the penetration success rate of the suction anchor and ensuring the anchoring effect of the suction anchor.

[0071] In the description of this specification, the descriptions of terms such as "one embodiment", "some embodiments", "specific embodiments", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or instance. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0072] In the description of this specification, the specific features, structures, materials or characteristics can be combined in a suitable manner in any one or more embodiments or examples.

[0073] Certainly, the present invention can also have other various embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention, but these changes and deformations should all fall within the protection scope of the claims of the present invention.

Claims

1. An attitude stability assistance device for a suction anchor, characterized in that, The suction anchor for a deep - sea floating platform is provided with a suction pump, and includes: a top cover (1), an intermediate cylinder (2) and a bottom substrate (3); The top cover (1) includes a top plate (1 - 1) and a magnetic device (1 - 4): The magnetic device (1 - 4) is connected to the top plate (1 - 1) and is located within the intermediate cylinder (2). The top plate (1 - 1) is provided with a plurality of circumferential water - passing holes (1 - 2) and a central wire - passing hole (1 - 3); The magnetic device (1 - 4) is spaced from the circumferential water - passing holes (1 - 2) and the central wire - passing hole (1 - 3). The central wire - passing hole (1 - 3) is used for passing a cable connecting the suction anchor and the deep - sea floating platform, and the magnetic device (1 - 4) is used for magnetically connecting with the suction anchor; The intermediate cylinder (2) includes a cylinder body (2 - 1) and a plurality of wedges (2 - 3). Each wedge (2 - 3) is conical. The large end of the wedge (2 - 3) is connected to the inner wall of the cylinder body (2 - 1), and the small end of the wedge (2 - 3) points to the central axis of the cylinder body (2 - 1), so that the wedge (2 - 3) is arranged along the radial direction of the cylinder body (2 - 1). A plurality of wedges (2 - 3) are circumferentially arrayed inside the cylinder body (2 - 1). The cylinder body (2 - 1) is provided with a plurality of water - passing holes (2 - 2), and the plurality of water - passing holes (2 - 2) are circumferentially arrayed inside the cylinder body (2 - 1) and are spaced from the wedges (2 - 3); The top plate (1 - 1) and the bottom substrate (3) are respectively arranged at the axial two ends of the cylinder body (2 - 1). The top plate (1 - 1) seals one open end of the cylinder body (2 - 1). The bottom substrate (3) includes an annular disc - shaped structure, and the inner ring surface of the annular disc - shaped structure is connected to the outer wall of the cylinder body (2 - 1); Wherein, both the wedge (2 - 3) and the bottom substrate (3) are made of flexible materials.

2. The suction anchor attitude - stabilizing auxiliary device according to claim 1, wherein, The central wire - passing hole (1 - 3) is arranged at the central position of the top plate (1 - 1), and a plurality of the circumferential water - passing holes (1 - 2) are arranged around the central wire - passing hole (1 - 3).

3. The suction anchor attitude - stabilizing auxiliary device according to claim 1, wherein, The number of the magnetic devices (1 - 4) is multiple, and the multiple magnetic devices (1 - 4) are circumferentially arrayed. The central wire - passing hole (1 - 3) is arranged at the center of the circumferential array for avoiding a space for the cable to pass through: Or The magnetic device (1 - 4) is annular and is provided with a through - hole, and the central wire - passing hole (1 - 3) is communicated with the through - hole for the cable to pass through.

4. The suction anchor attitude - stabilizing auxiliary device according to claim 1, wherein, The number of the wedges (2-3) is the same as the number of the water holes (2-2); the circular array formed by the plurality of wedges (2-3) is distributed in the same manner as the circular array of the plurality of water holes (2-2); along the circumferential direction of the cylinder (2-1), one wedge (2-3) is provided between two adjacent water holes (2-2), and one water hole (2-2) is provided between two adjacent wedges (2-3).

5. The suction anchor attitude stabilization auxiliary device according to claim 1, characterized in that: The connection force between the magnetic device (1-4) and the suction anchor is greater than the buoyancy of the suction anchor posture stabilization auxiliary device, and less than the difference between the initial negative pressure and the penetration resistance formed after the suction anchor starts the suction pump.

6. The suction anchor attitude stabilization auxiliary device according to claim 1, characterized in that: The annular disc-shaped structure is connected to the cylinder (2-1) by hot melting.

7. The suction anchor attitude stabilization auxiliary device according to claim 1, characterized in that: The central axis of the annular disc-shaped structure is colinear with the central axis of the cylinder (2-1).

8. The suction anchor attitude stabilization auxiliary device according to claim 1, characterized in that: The outer ring surface of the annular disc-shaped structure is a rounded shape.

9. A method for a suction anchor to penetrate into the seabed, characterized in that, The suction anchor attitude stabilization auxiliary device according to any one of claims 1 to 8 comprises the following steps: The suction anchor is placed in the middle cylinder of the suction anchor attitude stabilization auxiliary device, and the suction anchor attitude stabilization auxiliary device is abutted against the top of the suction anchor through a magnetic device; Pass the cable of the suction anchor and the cable of the suction pump thereon through the cable hole on the top plate of the suction anchor attitude stabilization auxiliary device and connect them to the deep-sea floating platform; The sharp wedges in the cylinder of the suction anchor posture stabilization auxiliary device are matched with the suction anchor by overfitting, so that all the sharp wedges are in contact with the outer wall of the suction anchor; Turn on the magnetic device to magnetically connect the magnetic device to the suction anchor; The suction anchor is released from the floating platform and lowered by its own weight; during the process of lowering by its own weight, the suction anchor is affected by the ocean current and its posture is shifted; Before the suction anchor contacts the seabed, the bottom substrate of the suction anchor attitude stabilization auxiliary device contacts the seabed first, and guides the suction anchor attitude to be perpendicular to the seabed surface; When the suction anchor contacts the seabed, the magnetic device maintains magnetic connection with the suction anchor; and the connection force of the magnetic connection is controlled to be greater than the buoyancy of the suction anchor attitude stabilization auxiliary device; Turning on the suction pump to create a pressure difference between the inside and outside, so that the suction anchor sinks into the seabed through pressure; wherein the connection force of the magnetic connection generated by the magnetic device of the suction anchor attitude stabilization auxiliary device is smaller than the sinking force of the suction anchor, so that the suction anchor attitude stabilization auxiliary device is separated from the suction anchor; The suction anchor is completely sunk into the seabed by pressure to achieve long-term anchoring; wherein, during the long-term anchoring process, the suction anchor attitude stabilization auxiliary device stays on the seabed.

10. The attitude stability assisting device for suction anchors according to claim 9, wherein After the suction anchor is completely sunk into the seabed by pressure, the following steps are also included: Water is injected into the suction anchor through a suction pump, creating a pressure difference in the opposite direction to the direction during the process of sinking into the seabed, causing the suction anchor to be pulled upward through the pressure difference, enter the cylindrical cavity of the suction anchor attitude stabilization auxiliary device, and be connected to the suction anchor attitude stabilization auxiliary device through a magnetic device; The suction anchor attitude stabilization auxiliary device together with the suction anchor is pulled upward through a cable and recovered into the deep-sea floating platform.

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