A kind of easy-to-pull water drilling platform leg structure of deep sinking prevention

Abstract

This invention discloses a support leg structure for an offshore drilling platform that prevents deep sinking and allows for easy removal from silt, relating to the field of water conservancy and geological exploration technology. The technical solution includes a support leg body, with steel wire rope fixing rods fixedly connected to opposite sides of the support leg body. The steel wire rope fixing rods are arranged vertically on the support leg body. A first outer plate is connected to the bottom of the support leg body, and a second, third, fourth, fifth, and sixth outer plate are sequentially connected to the outside of the first outer plate. By combining multiple outer plates with the support leg body to form a unified whole during operation, the settlement stability of the offshore drilling platform is improved. Furthermore, the pull-out mechanisms are independent, reducing the pull-out force required for each individual plate. This system allows for the conversion between the unified structure and the independent mechanisms, preventing the support leg from sinking deep while enabling the structure to be easily pulled out of silt, thus improving work efficiency.

Description

Technical Field

[0001] This invention belongs to the field of water conservancy and geological exploration technology, specifically relating to a support leg structure for a waterborne drilling platform that is easy to pull out and prevents deep sinking. Background Technology

[0002] In water conservancy projects, underwater core drilling and sampling is a core method for obtaining accurate geological data on underwater bedrock. The results directly support the entire process of project site selection, design, construction, quality control, and safety assessment, and are a key technical link in resolving unclear underwater geological conditions and mitigating engineering geological risks. Compared to surface geological surveys, underwater core samples can accurately reflect the original state of underwater bedrock (unaffected by water bodies, floating silt, or shoreline weathering), providing the only direct physical geological evidence for the scientific validity and safety of water conservancy projects.

[0003] Currently, underwater core drilling and sampling primarily relies on floating drilling platforms to support the drilling rig. Floating drilling platforms come in various fixing methods. Outriggers are widely used in shallow drilling operations due to their simple structure, easy construction, low cost, flexible platform displacement, and suitability for continuous multi-hole exploration. Outriggers must meet core requirements such as buoyancy resistance, scour resistance, capsizing resistance, precise positioning, and stable settlement. However, in riverbeds (estuaries) with deep silt, meeting these requirements and the frequent vibrations of drilling operations often leads to outriggers becoming deeply embedded in the silt and difficult to remove. This is primarily due to the combined effects of the adhesion between the silt and the outriggers, side friction, the consolidation and clamping force of the surrounding silt, and the mechanical gripping force of attachments to the outriggers. While these combined forces are beneficial during drilling operations, providing better stability for the drilling platform, they are detrimental during the outrigger removal process after drilling, significantly increasing the difficulty of extraction. Sometimes, due to excessive depth, the outriggers become impossible to remove.

[0004] Therefore, there is a need to provide a support leg structure for a floating drilling platform that is resistant to deep sinking and easy to pull out. Summary of the Invention

[0005] The purpose of this invention is to solve the above-mentioned problems existing in conventional outrigger applications and to provide an outrigger structure for a floating drilling platform that is resistant to deep sinking and easy to pull out.

[0006] To achieve the above-mentioned technical objectives and effects, the present invention is implemented through the following technical solution:

[0007] This invention provides a support leg structure for an offshore drilling platform that is resistant to deep sinking and easy to pull out. The support leg includes a main body, with steel wire rope fixing rods fixedly connected to opposite sides of the main body. The steel wire rope fixing rods are vertically arranged on the main body. A first outer plate is connected to the bottom of the main body. A second, third, fourth, fifth, and sixth outer plate are sequentially connected to the outside of the first outer plate. The first, second, third, fourth, and fifth outer plates are all connected to the steel wire rope fixing rods via steel wire ropes. The sixth outer plate is connected to an external drilling platform via a steel wire rope.

[0008] Preferably, a groove is provided on the outer side of the support leg body, and bolt holes are provided on both sides of the groove. A circumferential limiting boss is provided on the outer surface of the support leg body and below the wire rope fixing rod. The bottom of the circumferential limiting boss abuts against the top of the first extended disk to limit the first extended disk.

[0009] Preferably, the wire rope fixing rod is provided with a plurality of first wire rope connecting rings, which are used to fix the wire rope.

[0010] Preferably, the first, second, third, fourth, fifth, and sixth extended disks each have a limiting groove inside, and the outer surfaces of each extended disk have limiting pieces. This allows the first, second, third, fourth, fifth, and sixth extended disks to interlock with each other, jointly providing an upward force for the support leg body.

[0011] Preferably, two second wire rope connecting rings are arranged opposite each other on the first, second, third, fourth, fifth, and sixth outer extension disks.

[0012] Preferably, the second wire rope connecting rings on the first, second, third, fourth, and fifth outer extension disks are sequentially connected to the first wire rope connecting rings via multiple wire ropes.

[0013] Preferably, the first, second, third, fourth, fifth, and sixth epitaxial disks have identical structures, but differ in size.

[0014] Preferably, the second wire rope connecting ring on the sixth outer disk is connected to the external drilling platform via a wire rope.

[0015] The beneficial effects of this invention are:

[0016] 1. In this invention, by designing a multi-layered outer plate and a steel wire rope that work together, the multi-layered outer plate is connected into a whole under the action of the outermost steel wire rope when the drilling platform is working. This increases the adhesion force between the silt and the outriggers, the side friction resistance, the consolidation and clamping force of the silt around the outriggers, and the mechanical biting force of the attachments on the outriggers, thereby improving the drilling platform's anti-buoyancy, anti-impact, anti-overturning, and settlement stability.

[0017] 2. In this invention, during the process of pulling out the outrigger body after drilling work is completed on the drilling platform, the outer plates are pulled out one by one by relying on the pulling force of the wire rope. This disperses the adhesion force between the overall silt and the outrigger, the lateral friction resistance, the consolidation and clamping force of the silt around the outrigger, and the mechanical biting force of the attachments on the outrigger body, thereby reducing the pull-out force of the outrigger. Multiple outer plates are combined to bear the working force of the working platform as a whole. When pulled out, the overall structure is dispersed, and the corresponding force is also distributed to each outer plate, thereby preventing the outrigger from sinking deep during the working platform operation, reducing the pull-out force when pulling out the outrigger, and improving work efficiency.

[0018] Of course, any product implementing this invention does not necessarily need to achieve all of the above advantages at the same time. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a three-dimensional structural diagram showing the overall working state of the present invention;

[0021] Figure 2 This is a three-dimensional structural diagram of the support leg body in this invention;

[0022] Figure 3 This is a three-dimensional structural diagram of the wire rope fixing rod in this invention;

[0023] Figure 4 This is a three-dimensional structural diagram of the epitaxial disk in this invention;

[0024] Figure 5 This is a three-dimensional structural diagram of the overall pulled-out state in this invention. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] like Figures 1-5 As shown in the figure, this embodiment of the present invention provides a support leg structure for an offshore drilling platform that is easy to pull out and prevents deep sinking. It includes a support leg body 1, with steel wire rope fixing rods 2 fixedly connected to opposite sides of the support leg body 1. The steel wire rope fixing rods 2 are arranged vertically on the support leg body 1. A first outer extension plate 3 is connected to the bottom of the support leg body 1. A second outer extension plate 4, a third outer extension plate 5, a fourth outer extension plate 6, a fifth outer extension plate 7, and a sixth outer extension plate 8 are sequentially connected to the outside of the first outer extension plate 3. The first outer extension plate 3, the second outer extension plate 4, the third outer extension plate 5, the fourth outer extension plate 6, and the fifth outer extension plate 7 are all connected to the steel wire rope fixing rods 2 via steel wire ropes 9. The sixth outer extension plate 8 is connected to an external drilling platform via steel wire ropes 9.

[0027] Specifically, the extended structure at the bottom of the outrigger body 1 can increase the contact area between the outrigger and the silt, reduce the pressure under the same force, and reduce the depth to which the outrigger sinks into the silt. Simultaneously, the large-area extended structure can also improve the stability of the offshore drilling platform, enhance the outrigger's ability to be encased in silt, and improve the overall pull-out and impact resistance of the offshore drilling platform. It should be noted that the outrigger body 1 has a groove 101 on its outer side, with bolt holes 102 on both sides of the groove 101. A circumferential limiting boss 103 is provided on the outer surface of the outrigger body 1, located below the wire rope fixing rod 2. The bottom of the circumferential limiting boss 103 abuts against the top of the first extended disk 3 to limit the movement of the first extended disk 3. The wire rope fixing rod 2 is provided with multiple first wire rope connecting rings 201, which are used to fix the wire rope 9.

[0028] In this embodiment, the first outer extension disk 3, the second outer extension disk 4, the third outer extension disk 5, the fourth outer extension disk 6, the fifth outer extension disk 7, and the sixth outer extension disk 8 are all provided with limiting grooves 401, and the outer surfaces of the first outer extension disk 3, the second outer extension disk 4, the third outer extension disk 5, the fourth outer extension disk 6, the fifth outer extension disk 7, and the sixth outer extension disk 8 are all provided with limiting pieces. In this way, the first outer extension disk 3, the second outer extension disk 4, the third outer extension disk 5, the fourth outer extension disk 6, the fifth outer extension disk 7, and the sixth outer extension disk 8 can be interlocked in pairs to provide an upward force for the support leg body 1.

[0029] It should be noted that the limiting groove 401 is set so that the first outer extension plate 3, the second outer extension plate 4, the third outer extension plate 5, the fourth outer extension plate 6, the fifth outer extension plate 7 and the sixth outer extension plate 8 can fit together and provide an upward force to the outrigger body 1. The more the number and the larger the area, the greater the force provided and the stronger the ability to prevent the outrigger body 1 from sinking. Each outer extension plate is connected to the wire rope fixing rod 2 on the outrigger body 1 by a wire rope 9. When the outer extension plate and the outrigger body 1 are tightly fitted, the length of the wire rope 9 is greater than the distance between the outer extension plate and the wire rope fixing rod 2. The specific length depends on the situation. For example, when pulling outrigger body 1, the wire rope between the first outer extension plate 3 and the wire rope fixing rod 2 will only be under force after the outrigger body 1 is completely pulled out of the silt. Continue to pull the first outer extension plate 3, and so on, until all the outer extension plates are pulled out. Therefore, the length of the wire rope 9 should be as greater as possible than the sinking depth of the outrigger body 1.

[0030] In this invention, two second wire rope connecting rings 402 are respectively arranged on the first outer extension disk 3, the second outer extension disk 4, the third outer extension disk 5, the fourth outer extension disk 6, the fifth outer extension disk 7, and the sixth outer extension disk 8. The second wire rope connecting rings 402 on the first outer extension disk 3, the second outer extension disk 4, the third outer extension disk 5, the fourth outer extension disk 6, and the fifth outer extension disk 7 are sequentially connected to the first wire rope connecting ring 201 via multiple wire ropes 9. The first outer extension disk 3, the second outer extension disk 4, the third outer extension disk 5, the fourth outer extension disk 6, the fifth outer extension disk 7, and the sixth outer extension disk 8 have identical structures, but differ in size. The second wire rope connecting ring 402 on the sixth outer extension disk 8 is connected to an external drilling platform via wire ropes 9.

[0031] The working principle of this invention is as follows:

[0032] Step 1: When the offshore drilling platform reaches the designated drilling position, the outrigger body 1 is lowered. At this time, the steel wire rope 9 on the sixth outer extension plate 8, in coordination with the offshore drilling platform, tightens all the outer extension plates, making them fit tightly. During the lowering process, the steel wire rope 9 on the sixth outer extension plate 8 (the outermost outer extension plate) is always under tension, while the remaining internal steel wire ropes 9 are naturally piled up under the action of gravity, so that the outer extension plate and the outrigger body 1 form an integral structure. This stress state continues until the drilling work is completed.

[0033] Step 2: After the drilling work is completed, the outrigger body 1 needs to be pulled out and the drilling platform moved. During the process of pulling out the outrigger body 1, the steel wire rope 9 on the sixth outer plate 8 (the outermost outer plate) is released first. The overall structure of the outer plate and the outrigger body 1 will be destroyed, and each outer plate and the outrigger body 1 will be independent of each other, thereby reducing the pulling force of each component. Then the outrigger body 1 is pulled out. Because the outer plate and the outrigger body 1 are independent of each other, the outrigger body 1 can be easily pulled out. After the outrigger body 1 is completely removed from the silt, the first outer plate 3 begins to be pulled out under the action of the steel wire rope 9. This process is repeated until all the outer plates are pulled out of the silt.

[0034] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to specific implementations. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A support leg structure for an offshore drilling platform that is resistant to deep sinking and easy to pull out, comprising a support leg body (1), characterized in that, The outrigger body (1) is fixedly connected to steel wire rope fixing rods (2) on both sides. The steel wire rope fixing rods (2) are arranged vertically on the outrigger body (1). The bottom of the outrigger body (1) is connected to a first outer plate (3). The outer side of the first outer plate (3) is sequentially connected to a second outer plate (4), a third outer plate (5), a fourth outer plate (6), a fifth outer plate (7), and a sixth outer plate (8). The first outer plate (3), the second outer plate (4), the third outer plate (5), the fourth outer plate (6), and the fifth outer plate (7) are all connected to the steel wire rope fixing rods (2) by steel wire ropes (9). The sixth outer plate (8) is connected to the external drilling platform by steel wire ropes (9).

2. The anti-deep-sinking and easy-to-remove support leg structure for a surface drilling platform according to claim 1, characterized in that, The outer side of the support leg body (1) is provided with a groove (101), and bolt holes (102) are provided on both sides of the groove (101). A circumferential limiting boss (103) is provided on the outer surface of the support leg body (1) and below the wire rope fixing rod (2). The bottom of the circumferential limiting boss (103) abuts against the top of the first outer plate (3) to limit the first outer plate (3).

3. The anti-deep-sinking and easy-to-remove support leg structure for a surface drilling platform according to claim 1, characterized in that, The wire rope fixing rod (2) is provided with a plurality of first wire rope connecting rings (201), which are used to fix the wire rope (9).

4. The anti-deep-sinking and easy-to-remove support leg structure for a surface drilling platform according to claim 1, characterized in that, The first extension disk (3), the second extension disk (4), the third extension disk (5), the fourth extension disk (6), the fifth extension disk (7) and the sixth extension disk (8) are all provided with limiting grooves (401), and the outer surfaces of the first extension disk (3), the second extension disk (4), the third extension disk (5), the fourth extension disk (6), the fifth extension disk (7) and the sixth extension disk (8) are all provided with limiting pieces. In this way, the first extension disk (3), the second extension disk (4), the third extension disk (5), the fourth extension disk (6), the fifth extension disk (7) and the sixth extension disk (8) can be interlocked with each other to provide an upward force for the support leg body (1).

5. The anti-deep-sinking and easy-to-remove support leg structure for a surface drilling platform according to claim 1, characterized in that, Two second wire rope connecting rings (402) are respectively provided on the first outer plate (3), the second outer plate (4), the third outer plate (5), the fourth outer plate (6), the fifth outer plate (7) and the sixth outer plate (8).

6. The anti-deep-sinking and easy-to-remove support leg structure for a surface drilling platform according to claim 5, characterized in that, The second wire rope connecting rings (402) on the first outer plate (3), the second outer plate (4), the third outer plate (5), the fourth outer plate (6) and the fifth outer plate (7) are connected to the first wire rope connecting ring (201) in sequence by multiple wire ropes (9).

7. The anti-deep-sinking and easy-to-remove support leg structure for a surface drilling platform according to claim 1, characterized in that, The first epitaxial disk (3), the second epitaxial disk (4), the third epitaxial disk (5), the fourth epitaxial disk (6), the fifth epitaxial disk (7), and the sixth epitaxial disk (8) have the same structure, but different dimensions.

8. The anti-deep-sinking and easy-to-remove support leg structure for a surface drilling platform according to claim 5, characterized in that, The second wire rope connecting ring (402) on the sixth outer plate (8) is connected to the external drilling platform via a wire rope (9).

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