CN103224007A - Multi-floating-body mooring device for floating ocean platform - Google Patents

Abstract

The invention relates to an ocean platform multi-floating system mooring system which ensures the stability of the ocean platform mooring system. The invention includes a floating body, a mooring steel cable and a rigid connecting piece, and is characterized in that the floating body is arranged around the ocean platform and fixed on the sea level by the mooring steel cable; the floating body and the ocean platform are connected by a rigid truss. The present invention increases the number of mooring cables by connecting the floating body externally, improves the overall strength and reliability of the mooring system, and increases storage containers at the same time. Changing the original mooring form can improve the survivability of the floating platform in extreme sea conditions and ensure the safe production of the platform.

Description

A multi-floating system mooring device for a floating ocean platform

technical field

The invention relates to an ocean platform multi-floating system mooring system which ensures the stability of the ocean platform mooring system.

Background technique

With today's global energy shortage, the development of marine energy has attracted more and more attention. As the main structure for drilling, producing and storing oil and gas, the floating offshore platform has attracted the attention of people in the industry in all aspects. As the global climate has warmed in recent years, typhoons have occurred frequently, and their levels have gradually increased. At the same time, when collecting sea state data, it is concluded that when a typhoon occurs, its wind direction is uncertain, which will test the positioning ability of the mooring system of the offshore platform to a greater extent. How to ensure the normal production of the service platform or improve the storm self-storage capacity is the key during the service process. major problem. The current main mooring methods mainly include:

1. Single point mooring

The most commonly used is the turret mooring structure, which is mainly used in FPSO. It has a vane effect and can self-adjust according to the main force direction of the environment, but it is only suitable for ship-like platform structures.

2. Multi-point mooring

It can be divided into catenary type and tension type. A fairlead is set on the platform, and an anchor is used to fix the anchor chain on the seabed. The mooring cables of the catenary mooring system are in a relaxed state in the water. The advantage is that the platform and the mooring cables are relatively safe under high sea conditions, and the disadvantage is that the platform drifts relatively large. Tensioned mooring cables are under tension in the water. The advantage is that the platform drifts less in high sea conditions. The disadvantage is that the mooring cables are more dangerous under high sea conditions due to the larger pre-tension in the tensioned state, and due to currents, etc. The problem will generate vortex induced vibration and fatigue, and the life of mooring cables will be short.

3. Dynamic positioning

In recent years, the latest development and more concerned about the positioning system. Dynamic positioning is a technology that automatically maintains a floating structure within a specified allowable range around a certain position by controlling the propellers installed on the floating structure to generate thrust to resist the force of wind, waves and currents. Improve the mooring system of the platform. The advantage is that the degree of freedom is high, suitable for frequently moving platform structures, and the horizontal drift control is better. The disadvantage is that the cost is high, satellite assistance is required, and the vertical displacement control ability is weak.

Most of the damage to the platform after the typhoon was due to the destruction of the mooring system, which caused the platform to capsize or malfunction and affect production. The current mooring cable mooring positioning system for floating platforms is more commonly used, mainly because the cost is low and the positioning effect is better. drilling equipment.

Analyzing the above mooring system types, it can be seen that the mooring system still has unreliable factors under the current extreme sea conditions. Therefore, the present invention adopts a special structure to transform the platform, in order to optimize the mooring system of the floating platform, reduce the pulling force of the mooring cables, and improve the safety of the mooring system of the platform.

Contents of the invention

The purpose of the present invention is to provide a multi-floating system mooring device for a floating ocean platform that reduces the movement amplitude of the platform under extreme sea conditions and improves the survivability and safety of the platform under extreme sea conditions.

The purpose of the present invention is achieved like this:

The invention includes a floating body, a mooring steel cable and a rigid connecting piece, and is characterized in that the floating body is arranged around the ocean platform and fixed on the sea level by the mooring steel cable; the floating body and the ocean platform are connected by a rigid truss.

The connection between the rigid member and the floating body and the platform is connected by bearings.

Crude oil can also be stored in the floating body.

The beneficial effects of the present invention are: the number of mooring cables is increased, the overall strength and reliability of the mooring system are improved, and storage containers are increased at the same time by means of connecting the floating body externally. Changing the original mooring form can improve the survivability of the floating platform in extreme sea conditions and ensure the safe production of the platform.

Description of drawings

Fig. 1 is the schematic diagram of the mooring system of multi-floating system of the ocean platform of the present invention;

Fig. 2 is the plane layout diagram of the multi-floating system mooring system of the ocean platform;

Fig. 3 is a detailed view of the connection between the platform main body and the external floating body of the multi-floating system mooring system of the ocean platform.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

In Figure 1: 1. External mooring buoy 2. Connecting member 3. Platform main body 4. Floating system mooring cable

In Figure 2: 5. Floating system mooring cables

In Figure 3: 6. Platform main body

In order to solve the safety problem of the current floating platform mooring system, the floating platform mooring system can be improved. Large-scale floating bodies are arranged around the ocean platform, and the floating bodies are rigidly connected to the platform. The floating bodies are fixed on the sea level by mooring steel cables.

By mooring with multiple buoys, the effect of waves on the ocean platform is reduced. And through the rigid connection between the main body of the platform and the surrounding floating body, the movement of the platform is controlled to make it more stable on the sea level.

The multi-floating mooring system of the offshore platform is connected with multiple floating bodies to limit the displacement of the platform. However, due to the adoption of multi-floor structure, the number of mooring cables is increased, which ensures the increase of the overall strength of the mooring system. At the same time, since the main body of the platform is not connected by mooring cables, the load capacity of the platform is improved. The rigid connection between the floating body and the main body of the platform can better limit the displacement of the platform, and the stability of the main body of the platform can be adjusted by adjusting the stability of the floating body. And the mooring mode of the floating body can be adjusted according to the actual sea conditions, and the external floating body can be mixed with tension type and catenary type mooring to achieve the best positioning effect. At the same time of application, the main body of the platform can also use dynamic positioning to improve the mooring system. While exerting the mooring capacity, the external floating body can also be used as a crude oil storage container to increase the oil and gas production of the platform and play a multi-purpose role.

As shown in Figure 1 and Figure 2, the main body of No. 3 platform is connected with multiple floating structures (No. 1), and each floating body is fixed on the sea surface by mooring cables (No. 4, 5). The connection form between the main body of the platform and the floating structure is shown in Figure 3. Rigid connection is adopted, and the structure 8, 9, 10 is connected as a whole. The rigid connection can better limit the movement of the platform, and at the same time avoid the collision between the main body of the platform and the surrounding floating structures. Mooring the platform in this way increases the number of mooring cables, improves the overall safety of the platform, and can effectively resist extreme sea conditions. At the same time, it also increases the loading capacity of the platform itself, improving production efficiency and throughput.

Claims (3)

1. A multi-floating system mooring device for a floating ocean platform, comprising a floating body, a mooring steel cable, and a rigid connector. It is characterized in that: the floating body is arranged around the ocean platform and fixed on the sea level by mooring steel cables; the floating body and the ocean platform are connected by rigid trusses. 2. A mooring device with multiple buoys for a floating ocean platform according to claim 1, characterized in that: the connection between the rigid member, the buoy and the platform is connected by a bearing. 3. A mooring device with multiple buoys for floating ocean platforms according to claim 1, characterized in that crude oil can also be stored in the buoys.

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