Mooring device for tension mooring system

Abstract

The invention discloses a mooring device used for a tensioning type mooring system. The mooring device used for the tensioning type mooring system comprises a mooring rope, a first winch placed on an ocean platform, a support arranged on the ocean platform, a float bowl placed in the sea, a movable pulley connected with the float bowl through a wire rope, a first fixed pulley connected with the movable pulley through a wire rope, a second fixed pulley fixedly connected with the tail end of the mooring rope, an anchor and a weight block, wherein the anchor and the weight block are placed at the bottom of the sea. The tension in the maximum tension position of the mooring rope is reduced by half to prevent fatigue rupture, hundred-year severe sea conditions are effectively coped with, the design specification of the first winch is reduced, therefore workloads of the anchor at the bottom of the sea are greatly reduced, design requirements for the anchor are reduced, and not only is safety increased, but also equipment cost is reduced. Before the ocean platform reaches an oil extraction area, the mooring system can be installed beforehand, mooring positions can be marked through the float bowl, installation is convenient, weight is light and a mooring radius is small.

Description

technical field [0001] The invention relates to a deep sea mooring system, in particular to a mooring device for a tension mooring system. Background technique [0002] At present, more than 80% of the world's proven offshore oil reserves are concentrated within a water depth of 500m, but more than 70% of the world's ocean area is between 3000m and 6000m, and a large amount of sea area remains to be proven. In addition, except for a few sea areas in the world, offshore oil and gas resources in most areas have been depleted day by day, and the development of deep sea has become an inevitable trend. [0003] One of the key issues in going to the deep sea is the positioning of floating structures. Large floating structures are generally positioned in two ways: mooring positioning and dynamic positioning. Because the mooring system has the advantages of low investment, convenient use and maintenance, etc., the mooring system is currently the main positioning system. [0004] ...

AI Technical Summary

Problems solved by technology

Nevertheless, the tension mooring also has many disadvantages, such as: the end of the tension mooring line forms a certain angle (generally 30°~45°) with the seabed, so the anchor point on the seabed will be subject to a large vertical force. This puts high requirements on the vertical pull-out performance of the anchor. The submarine mooring foundation of tension mooring generally adopts normal load-bearing anchor or suction anchor. These equipments are complex in technology and high in installation cost

Another example is the polymer material used for tension mooring. Its material and mechanical properties are very complex, and the rapid change of tension is very easy to cause fatigue damage. In theoretical research, a large safety factor has to be used, which is more practical for engineering applications. bring great challenges

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