Semi-submersible vessel and its operation method

A semi-submersible ship and operation technology, applied in the direction of hull, icebreaker, ship construction, etc., can solve problems such as waters that are not suitable for freezing, and achieve the effect of reducing the risk of problems caused by ice substances

Inactive Publication Date: 2016-08-24
ITREC BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A disadvantage of current semi-submersible vessels is that they are particularly unsuitable for icy waters, ie, waters where large amounts of ice are present

Method used

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  • Semi-submersible vessel and its operation method
  • Semi-submersible vessel and its operation method
  • Semi-submersible vessel and its operation method

Examples

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Embodiment Construction

[0088] figure 1 A vertical section of a semi-submersible vessel 1 according to an embodiment of the invention is shown. The semi-submersible vessel 1 includes a working deck 3 for accommodating equipment. In this embodiment, the apparatus comprises a drilling rig 4 having a tower 4a and hoisting means comprising a load coupling 4b of a fixed top drive 4c, a hoisting line 4d, and a hoisting winch 4e. The tower 4a may have a closed wall of circular cross-section in plan view. In this embodiment, the main part of the tower is therefore cylindrical. At the top of the cylinder, a tapered portion is provided.

[0089] The semi-submersible vessel 1 further comprises a pontoon 5 and a substantially vertical connecting structure 7 between the pontoon 5 and the working deck 3 .

[0090] At different heights of the connecting structure, horizontal dotted lines 11, 13, 14, 15 are drawn to show different parts of the connecting structure. Between the dotted lines 11 and 13 there is a ...

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Abstract

The present invention relates to a semi-submersible ship for offshore operations. The semi-submersible ship is suitable for operating in icy waters and ice-free waters. The semi-submersible ship includes: - an operation deck for accommodating equipment; - at least one lower a hull; - a substantially vertical connecting structure between the at least one lower hull and the working deck; - a ballast system for ballasting or depressurizing the ship; wherein the connecting structures have a water portion and an ice-breaking portion, wherein the semi-submersible vessel is constructed to have an ice-breaking draft for icy waters and an ice-free draft for ice-free waters, wherein in the ice-breaking draft the waterline or ice line is substantially flush with the ice-breaking portion, In an ice-free draft, the waterline is substantially flush with the water portion, where the ice-breaking portion has a closed conical profile, and where the water portion of the connecting structure intersects the water surface during the ice-free draft with a smaller total area than the ice-breaking portion of the connecting structure The total area intersected by the water surface during the icebreaking draft.

Description

technical field [0001] The invention relates to a semi-submersible vessel for offshore operations, having a working deck for accommodating equipment, at least one lower hull, a ballast system for ballasting and depressurizing the ship, and connecting the working deck and said At least one lower hull connection structure. Background technique [0002] Such semi-submersible vessels are commonly used in many specific offshore tasks, for example, for offshore drilling rigs, safety vessels, oil production platforms, and large crane vessels. [0003] The advantage of semi-submersible vessels over ordinary vessels is that limited wave sensitivity and good sea resistance characteristics can be achieved by providing a ballastable, impermeable lower hull, such as a pontoon, below the water surface and waves. The working deck is located above sea level, so it is well protected from the waves. The function of the connecting structure is to support the working deck from at least one of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B63B35/44B63B1/02
CPCB63B35/08B63B2241/12B63B1/041B63B35/4413B63B35/44B63B1/02B63B2001/044B63B1/04E21B19/143
Inventor J·鲁德博格M·L·布林克曼A·别列兹尼茨基
Owner ITREC BV
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