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Semi-submersible vessel and operating method

A technology for semi-submersible boats and operations, which is applied to ship hulls, icebreakers, 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: 2013-03-27
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 operating method
  • Semi-submersible vessel and operating method
  • Semi-submersible vessel and operating 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 invention relates to a semi-submersible vessel for offshore operations which is suitable to be operated in icy waters and in ice-free waters, said vessel comprising: -an operating deck to accommodate equipment; -at least one lower hull; -an essentially vertical connecting structure between the at least one lower hull and the operating deck; -a ballast system to ballast or deballast the vessel; ; wherein the connecting structure has a water portion and an icebreaking portion being arranged on top of each other, wherein the vessel is configured to have an icebreaking draft for icy waters in which the water- or iceline is substantially level with the icebreaking portion, and a water draft for ice-free waters in which the waterline is substantially level with the water portion, wherein the icebreaking portion has a closed tapered contour, and wherein during the water draft the collective area of the water portion of the connecting structure intersecting the water surface is smaller than the collective area of the icebreaking portion of the connecting structure intersecting 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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IPC IPC(8): B63B35/44B63B1/02
CPCB63B1/041B63B2001/044B63B1/04B63B2211/06B63B35/4413B63B35/08B63B2241/12B63B35/44B63B1/02E21B19/143
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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