Hybrid deep water mooring system

Abstract

The invention discloses a hybrid deep water mooring system which comprises a mooring cable, an anchor, a plurality of mass blocks and a floater, wherein the mooring cable is located at the tail end of the mooring cable, the plurality of mass blocks are close to the anchor and are sequentially connected on the mooring cable, and a floater is connected to the top end of the mooring cable; one end of the mooring cable close to the anchor is tangent with the sea bottom through the plurality of mass blocks, and the component of the extension of the mooring cable in a vertical direction is completely eliminated by the gravities of the mass blocks; when the extension is reduced, the seabed can provide a supporting force for the mass blocks so as to relieve the extension of the cable.

Description

technical field [0001] The invention relates to the field of mooring, in particular to a novel deep-water mooring system suitable for deep-water marine engineering structures. Background technique [0002] With the increasing energy demand in the world and the gradual reduction of oil and gas reserves in shallow waters, the floating system suitable for the development of deep sea oil and gas resources has gradually become a frontier field of research. There are two main positioning systems used for large floating structures: mooring (positioning) systems and dynamic positioning systems. Because the mooring system has the characteristics of low investment, easy use and maintenance, etc., the mooring system is the main positioning system currently used, and it is widely used in various floating structures. The two most commonly used mooring positioning systems are catenary mooring system and taut mooring system. As the working water depth increases, the traditional catenary ...

AI Technical Summary

Problems solved by technology

[0003] 1. The catenary mooring system relies on the gravity of the steel cable itself to provide the restoring force of the floating body. Therefore, the weight of the cable is usually very large, which not only increases the manufacturing cost, but also increases the tension of the cable as the cable is lifted from the seabed. significantly increased, thereby reducing the effective carrying capacity of the platform;

[0004] 2. The length of the catenary mooring cable is generally very long (up to 3 times the water depth), so the mooring semi-warp increases accordingly, which will increase the seabed area occupied by the mooring foundation and the connection with other nearby underwater facilities. risk of collision;

[0005] 3. The recovery stiffness of the catenary mooring cable is small, and the offset of the platform is large, which affects the drilling activities

At present, the tension mooring system uses more normal load-bearing anchors or suction anchors. These devices are technically complex and costly to install

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