Double-channel stand pipe mounting structure special for deep-sea mining and laying method

Abstract

The double-channel vertical pipe mounting structure special for deep-sea mining comprises two single-channel vertical pipe units which are arranged in parallel in a spaced mode, the top of each single-channel vertical pipe unit is provided with a female connector, and the bottom of each single-channel vertical pipe unit is provided with a male connector. The male joint of the previous vertical pipe is matched with the female joint of the next vertical pipe and is fixedly connected with the female joint through a hoop, and a lifting lug is mounted at the male joint; fixed middle plate connecting pieces are installed on the upper portions and the lower portions of the two single-channel vertical pipe units correspondingly, a plurality of fixed split plate connecting pieces are distributed on the portions, between the two fixed middle plate connecting pieces, of the two single-channel vertical pipe units at intervals at intervals, and buoyancy materials are installed between the fixed middle plate connecting piece located at the topmost portion and the fixed split plate connecting pieces. The same buoyancy material is installed between the fixed middle plate connecting piece and the fixed split plate connecting pieces which are located at the bottommost portion, the same buoyancy material is installed between every two adjacent fixed split plate connecting pieces, and work is reliable.

Description

Technical Field

[0001] The present invention relates to the technical field of marine equipment auxiliary devices, and in particular to a dual-channel riser installation structure and a deployment method specifically used for deep-sea mining. Background Art

[0002] With the development of the social economy and emerging industries such as new energy vehicles, the demand for mineral resources such as cobalt, manganese, and copper is becoming increasingly urgent. Compared to terrestrial mineral resources, marine mineral resources have the advantages of large reserves and high quality. They are the focus of future mineral resource development and an important guarantee for economic development. However, marine mineral resources are often located on the deep seabed, making mining much more difficult than terrestrial mineral resources. In addition, the deep sea ecosystem is more fragile, and deep-sea mineral resource development may have a devastating impact on seabed life.

[0003] To exploit seabed mineral resources, an economical and efficient mineral lifting system is required. Rigid risers, due to their high efficiency and stability, have been widely used in the field of submarine oil development. However, existing rigid risers struggle to address the tailwater discharge problem during mineral transportation. Directly discharging contaminated seawater onto the seabed can severely impact the seabed ecosystem. To mitigate the impact of mining on the seabed ecosystem, the seawater used to transport minerals needs to be recycled and reused to reduce tailwater discharge, which poses new challenges to existing rigid risers. Summary of the Invention

[0004] In response to the shortcomings of the above-mentioned existing production technologies, the applicant provides a dual-channel riser installation structure and deployment method specifically for deep-sea mining. Two rigid risers are connected through a pipeline connection mechanism to form a dual-channel riser. While lifting seabed minerals to a surface mining vessel, the tail water on the mining vessel is simultaneously transported to the seabed, completing the recycling of the tail water, reducing environmental pollution caused by deep-sea mining, and improving the efficiency of seabed mineral lifting.

[0005] The technical solutions adopted in the present invention are as follows:

[0006] A dual-channel riser installation structure specially used for deep-sea mining includes two single-channel riser units arranged in parallel and spaced apart. A female joint is provided at the top of each single-channel riser unit, and a male joint is provided at the bottom of each single-channel riser unit. The male joint of the upper riser cooperates with the female joint of the lower riser and is connected and fixed by a clamp. A lifting lug is installed at the male joint; fixed middle plate connectors are respectively installed at the upper and lower parts of the two single-channel riser units, and a plurality of fixed split plate connectors are spaced apart on the two single-channel riser units between the two fixed middle plate connectors. Buoyancy material is installed between the fixed middle plate connector and the fixed split plate connector at the top, the same buoyancy material is installed between the fixed middle plate connector and the fixed split plate connector at the bottom, and the same buoyancy material is installed between two adjacent fixed split plate connectors.

[0007] Its further technical solution is:

[0008] The single-channel riser unit adopts an integrated structure.

[0009] The inner diameter of the single-channel riser unit is 254 mm, the wall thickness is 30 mm, and the length is 20 m.

[0010] The structure of the fixed middle plate connecting piece is as follows: it includes a fixed middle plate, and arc structures are symmetrically arranged at both ends of the fixed middle plate. The fixed side plate is installed at the arc structure by means of No. 1 bolts. The fixed side plate and the arc structure form a circular hole, and grooves are distributed in the circular hole. A plurality of No. 1 welding bosses spaced apart in the circumferential direction are arranged in the groove. The plurality of No. 1 welding bosses are simultaneously clamped with the single-channel riser unit.

[0011] The structure of the fixed split plate connecting piece is as follows: it includes fixed split plates arranged relatively to each other, and the two fixed split plates are locked by No. 2 bolts; a single fixed split plate is in a "3"-shaped structure, and a pit is provided on the inner side of the single fixed split plate, and a plurality of No. 2 welding bosses are provided in the pit, and the plurality of No. 2 welding bosses are simultaneously clamped with the single-channel riser unit.

[0012] The lifting lug adopts a split thin plate structure.

[0013] Each buoyancy material is provided with a plurality of square holes, and each square hole is locked with the single-channel riser unit through a fastener.

[0014] The buoyancy material is provided with an inner concave structure cooperating with the single-channel riser unit.

[0015] The density of the buoyancy material is less than the density of seawater.

[0016] A method for deploying a dual-channel riser installation structure specifically for deep-sea mining includes the following steps:

[0017] The arrangements on the deployment platform include vertical lifting and horizontal lifting;

[0018] Connect the female connector by vertical lifting, and gradually lift the upper end of the riser. Install the lifting lug on the male connector, and lift the lower end of the riser by horizontal lifting. By coordinating vertical and horizontal lifting, the riser is transformed from a horizontal position to a vertical position, thus achieving vertical lifting of the riser.

[0019] Loosen the horizontal lifting, insert the male connector at the bottom of the riser into the female connector of the upper riser, and complete the connection between the male and female connectors with a clamp;

[0020] The slip has an inner diameter that matches the female connector, providing tension for the installed riser. After the male connector and the female connector are connected, loosen the slip of the previous riser, move the riser down one riser length, and move the slip again to clamp the female connector at the top of the riser, thereby fixing the riser and completing the placement of the riser.

[0021] The beneficial effects of the present invention are as follows:

[0022] The present invention has a compact and reasonable structure and is easy to operate. Through the unique design of the pipeline connection mechanism, two rigid risers are connected to form a dual-channel riser. While lifting seabed minerals to the surface mining ship, the tail water on the mining ship is transported to the seabed, completing the recycling of the tail water, reducing environmental pollution caused by deep-sea mining, and improving the efficiency of seabed mineral lifting.

[0023] The present invention is designed with a fixed middle plate connector and a fixed split plate connector. With the cooperation of the two, two single-channel riser units can be connected. The two single-channel riser units respectively undertake the functions of mineral lifting and tail water recovery, realizing the recycling and utilization of polluted water in the deep-sea mining process, which can effectively reduce pollution to the environment and improve the efficiency of mineral transportation.

[0024] The present invention connects two single-channel riser units through a riser connection mechanism, thereby improving the bending and torsional rigidity of the riser and effectively ensuring the stability of the riser during service.

[0025] The male connector, clamp and female connector of the present invention are respectively located at the upper and lower ends of the single-channel riser unit to form a complete single-channel riser unit, which can realize the functions of a traditional single-channel riser and has the characteristics of wide application range and easy installation.

[0026] The present invention completes the fixation of the single-channel riser unit by fixing the middle plate, the side plate and the split plate in two different combinations, and has the characteristics of easy installation and stable structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the present invention.

[0028] Figure 2 It is a partial view of the upper part of the present invention.

[0029] Figure 3 It is a partial view of the lower part of the present invention.

[0030] Figure 4 It is an exploded view of the present invention.

[0031] Figure 5 It is a structural schematic diagram of the fixed middle plate connecting piece of the present invention.

[0032] Figure 6 This is an exploded view of the fixed middle plate connector of the present invention.

[0033] Figure 7 This is a schematic structural diagram of a split plate fixing connector according to the present invention.

[0034] Figure 8 This is an exploded view of the connecting piece for fixing split plates according to the present invention.

[0035] Figure 9 This is a schematic diagram of the installation of the female connector, male connector and clamp of the present invention.

[0036] Figure 10 for Figure 9 Cross-sectional view of section CC.

[0037] Figure 11 It is a schematic diagram of the present invention in working state.

[0038] Including: 1. Female connector; 2. Single channel riser unit; 3. Fixed mid-plate connector; 4. Buoyancy material; 5. Fixed split plate connector; 6. Male connector; 7. Lifting lug; 8. Clamp;

[0039] 301, No. 1 bolt; 302, fixed side plate; 303, No. 1 welding boss; 304, groove; 305, fixed middle plate;

[0040] 501, No. 2 bolt; 502, fixed split plate; 503, No. 2 welding boss; 504, pit;

[0041] 11. Vertical lifting; 12. Slips; 13. Laying platform; 14. Horizontal lifting. DETAILED DESCRIPTION

[0042] The specific embodiments of the present invention will be described below with reference to the accompanying drawings.

[0043] like Figures 1-11As shown, the dual-channel riser installation structure of this embodiment, which is specially used for deep-sea mining, includes two single-channel riser units 2 arranged in parallel and spaced apart. A female connector 1 is provided on the top of each single-channel riser unit 2, and a male connector 6 is provided on the bottom of each single-channel riser unit 2. The male connector 6 of the upper riser cooperates with the female connector 1 of the lower riser and is connected and fixed by a clamp 8. A lifting lug 7 is installed at the male connector 6; a fixed middle plate connector 3 is installed on the upper and lower parts of the two single-channel riser units 2 respectively, and a plurality of fixed split plate connectors 5 are distributed at intervals on the two single-channel riser units 2 between the two fixed middle plate connectors 3. Buoyancy material 4 is installed between the fixed middle plate connector 3 at the top and the fixed split plate connector 5, the same buoyancy material 4 is installed between the fixed middle plate connector 3 at the bottom and the fixed split plate connector 5, and the same buoyancy material 4 is installed between two adjacent fixed split plate connectors 5.

[0044] The single-channel riser unit 2 adopts an integrated structure.

[0045] The inner diameter of the single-channel riser unit 2 is 254 mm, the wall thickness is 30 mm, and the length is 20 m.

[0046] The structure of the fixed middle plate connector 3 is as follows: it includes a fixed middle plate 305, and arc structures are symmetrically arranged at both ends of the fixed middle plate 305. The fixed side plate 302 is installed at the arc structure through No. 1 bolts 301. The fixed side plate 302 and the arc structure form a circular hole, and grooves 304 are distributed in the circular hole. A plurality of No. 1 welding bosses 303 spaced apart in the circumferential direction are provided in the grooves 304. The plurality of No. 1 welding bosses 303 are simultaneously clamped with the single-channel riser unit 2.

[0047] The structure of the fixed split plate connecting member 5 is as follows: it includes relatively arranged fixed split plates 502, and the two fixed split plates 502 are locked by No. 2 bolts 501; a single fixed split plate 502 is in a "3" shape, and a pit 504 is provided on the inner side of the single fixed split plate 502, and a plurality of No. 2 welding bosses 503 are provided in the pit 504, and the plurality of No. 2 welding bosses 503 are simultaneously clamped with the single-channel riser unit 2.

[0048] The lifting lug 7 adopts a split thin plate structure.

[0049] Each buoyancy material 4 is provided with a plurality of square holes, and each square hole is locked with the single-channel riser unit 2 by a fastener.

[0050] The buoyancy material 4 is provided with a concave structure inside to cooperate with the single-channel riser unit 2 .

[0051] The density of the buoyancy material 4 is less than the density of seawater.

[0052] The specific structure and functions of the dual-channel riser installation structure specifically for deep-sea mining described in the present invention are as follows:

[0053] It mainly includes a single-channel riser unit 2, which is the main body for deep-sea mineral transportation and tailwater discharge. Its inner diameter, wall thickness and length are determined according to actual working conditions. In this embodiment, the single-channel riser unit 2 has an inner diameter of 254 mm, a wall thickness of 30 mm and a length of 20 m.

[0054] It also includes a fixed middle plate connector 3 and a fixed split plate connector 5, which are mainly used to connect and fix two single-channel riser units 2. In this embodiment, two upper and lower fixed middle plate connectors 3 and three middle fixed split plate connectors 5 are arranged, and the spacing between the upper and lower fixed middle plate connectors 3 is 4850 mm.

[0055] The single fixed middle plate connecting member 3 is composed of a fixed middle plate 305 , a fixed side plate 302 and a No. 1 welding boss 303 and other components.

[0056] Among them, multiple No. 1 welding bosses 303 form a circular ring structure, the inner diameter of which matches the outer diameter of the single-channel riser unit 2 and is fixed to the single-channel riser unit 2 by welding.

[0057] Among them, the fixed middle plate 305 has a groove 304 that cooperates with the No. 1 welding boss 303, and is fixed between the two single-channel riser units 2 through the No. 1 welding boss 303. The fixed side plate 302 has a through hole that cooperates with the fixed middle plate 305, and is connected with the No. 1 bolt 301 to achieve locking with the fixed middle plate 305 and fix the two single-channel riser units 2.

[0058] The fixed split plate connecting member 5 is composed of a fixed split plate 502 and a No. 2 welding boss 503 and other components.

[0059] Among them, the fixed split plate 502 has a pit 504 that matches the No. 2 welding boss 503. The two fixed split plates 502 are fixed by the No. 2 bolts 501, and the two single-channel riser units 2 are fixed.

[0060] As attached Figure 9 and Figure 10 As shown, the riser joint is used to connect deep-sea mining risers in series, so that different risers can be combined into a whole to transport minerals from the seabed to the sea surface, and includes a female joint 1, a male joint 6 and a clamp 8.

[0061] The female connector 1 is fixed to the upper end of the single-channel riser unit 2 by welding, and the male connector 6 is fixed to the lower end of the single-channel riser unit 2 by welding. The outer diameter of the male connector 6 matches the inner diameter of the female connector 1 and can be inserted into the female connector 1 of the previous riser. The connection and fixation of the connectors are achieved by the clamp 8.

[0062] As attached Figure 1 As shown, the buoyancy material 4 has an inner concave structure that matches the dual-channel riser. Fasteners connect the two buoyancy materials 4 to secure them tightly to the dual-channel riser. The density of the buoyancy material 4 is lower than that of seawater, providing upward buoyancy for the dual-channel riser in seawater.

[0063] Specifically, the method for deploying a dual-channel riser installation structure specifically for deep-sea mining described in the present invention has the following specific working process:

[0064] As attached Figure 11 As shown, vertical lifting 11 and horizontal lifting 14 are arranged on the laying platform 13. The lifting ear on the female joint 1 of the riser is connected through the vertical lifting 11, and the upper end of the riser is gradually lifted. The lifting ear 7 is installed on the male joint 6, and the lower end of the riser is lifted through the horizontal lifting 14. The riser is transformed from a horizontal placement state to a vertical state through the cooperation of the vertical lifting 11 and the horizontal lifting 14, thereby realizing the vertical lifting of the riser.

[0065] Loosen the horizontal lifting 14, insert the male connector 6 at the bottom end of the riser into the female connector 1 of the previous riser, and complete the connection between the male connector 6 and the female connector 1 through the clamp 8.

[0066] Slips 12 have an inner diameter that matches that of female connector 1, providing tension for the installed riser. After male connector 6 and female connector 1 are connected, the slips 12 on the previous riser are released, the riser is moved down one riser length, and the slips 12 are repositioned to engage female connector 1 at the top of the riser, thereby securing the riser and completing its deployment.

[0067] The installation positions and component sizes in the above embodiments need to be determined according to actual working conditions.

[0068] The above description is an explanation of the present invention, not a limitation of the present invention. The scope of the present invention is defined in the claims. Any modifications may be made within the scope of protection of the present invention.

Claims

1. A dual-channel riser installation structure specifically for deep-sea mining, characterized by: The invention comprises two parallel and spaced-apart single-channel riser units (2), wherein a female joint (1) is provided on the top of each single-channel riser unit (2), and a male joint (6) is provided on the bottom of each single-channel riser unit (2). The male joint (6) of the upper riser cooperates with the female joint (1) of the lower riser and is connected and fixed by a clamp (8). A lifting lug (7) is installed at the male joint (6); a fixed middle plate connector ( 3), a plurality of fixed split plate connectors (5) are spaced apart and distributed on the two single-channel riser units (2) between the two fixed middle plate connectors (3), a buoyancy material (4) is installed between the topmost fixed middle plate connector (3) and the fixed split plate connector (5), the same buoyancy material (4) is installed between the bottommost fixed middle plate connector (3) and the fixed split plate connector (5), and the same buoyancy material (4) is installed between two adjacent fixed split plate connectors (5).

2. A dual-channel riser installation structure specifically for deep-sea mining according to claim 1, characterized in that: The single-channel riser unit (2) adopts an integrated structure.

3. The dual-channel riser installation structure specifically for deep-sea mining according to claim 1, characterized in that: The single-channel riser unit (2) has an inner diameter of 254 mm, a wall thickness of 30 mm, and a length of 20 m.

4. The dual-channel riser installation structure specifically for deep-sea mining according to claim 1, characterized in that: The structure of the fixed middle plate connecting member (3) is as follows: it includes a fixed middle plate (305), arc structures are symmetrically arranged at both ends of the fixed middle plate (305), a fixed side plate (302) is installed at the arc structure through a No. 1 bolt (301), the fixed side plate (302) and the arc structure form a circular hole, and grooves (304) are distributed in the circular hole, and a plurality of No. 1 welding bosses (303) spaced apart in the circumferential direction are arranged in the grooves (304), and the plurality of No. 1 welding bosses (303) are simultaneously clamped with the single-channel riser unit (2).

5. The dual-channel riser installation structure specifically for deep-sea mining according to claim 1, characterized in that: The structure of the fixed split plate connecting member (5) is as follows: it comprises fixed split plates (502) arranged opposite to each other, the two fixed split plates (502) being locked by a No. 2 bolt (501); a single fixed split plate (502) presents a "3"-shaped structure, a recess (504) is provided on the inner side of the single fixed split plate (502), a plurality of No. 2 welding bosses (503) are provided in the recess (504), and the plurality of No. 2 welding bosses (503) are simultaneously engaged and clamped with the single-channel riser unit (2).

6. The dual-channel riser installation structure specifically for deep-sea mining according to claim 1, characterized in that: The lifting lug (7) adopts a split thin plate structure.

7. The dual-channel riser installation structure specifically for deep-sea mining according to claim 1, characterized in that: Each buoyancy material (4) is provided with a plurality of square holes, and each square hole is locked with the single-channel riser unit (2) via a fastener.

8. The dual-channel riser installation structure specifically for deep-sea mining according to claim 1, characterized in that: The buoyancy material (4) is provided with an inner concave structure cooperating with the single-channel riser unit (2).

9. The dual-channel riser installation structure specifically for deep-sea mining according to claim 1, characterized in that: The density of the buoyancy material (4) is less than the density of seawater.

10. A method for deploying a dual-channel riser installation structure specifically for deep-sea mining according to claim 1, characterized in that: The process includes the following: The arrangement on the laying platform (13) includes a vertical hoist (11) and a horizontal hoist (14); Connect the female connector (1) through vertical lifting (11), gradually lift the upper end of the riser, install the lifting lug (7) on the male connector (6), and lift the lower end of the riser through horizontal lifting (14). The vertical lifting (11) and the horizontal lifting (14) are used to complete the transition of the riser from a horizontal position to a vertical position, thereby realizing vertical lifting of the riser; Loosen the horizontal lifting (14), insert the male connector (6) at the bottom end of the vertical pipe into the female connector (1) of the previous vertical pipe, and complete the connection between the male connector (6) and the female connector (1) through the clamp (8); The slip (12) has an inner diameter that matches the female connector (1) and provides tension for the installed riser. After the male connector (6) and the female connector (1) are connected, the slip (12) of the previous riser is released, the riser is moved downward by a length of the riser, and the slip (12) is moved again to clamp the female connector (1) at the top of the riser, thereby achieving the fixation of the riser and completing the deployment of the riser.

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