A shallow water system
A shallow water system and still water technology, applied in the field of shallow water system, can solve problems such as damage to flexible conveying units, changes in the distance of top-side suspension structures and seabed structures, etc.
Inactive Publication Date: 2015-03-11
NAT OILWELL VARCO DENMARK
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AI Technical Summary
Problems solved by technology
However, due to the movement of the weathervaning vessel under the influence of weather conditions, the distance between the top side suspension structure and the subsea structure may vary greatly for a particular shallow water system
This may cause the flexible transport unit to be excessively bent or touch the ground and drag on the seabed, and / or the flexible transport unit may be stretched, which stretching may lead to damage to the flexible transport unit
Method used
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[0063]Further applicability of the present invention will appear from the detailed description given hereinafter. It should be understood, however, that the detailed description and specific examples, while indicating preferred embodiments of the invention, will become apparent to those skilled in the art from the detailed description and specific examples, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art. example, but is given by way of illustration only.
[0064] figure 1 A schematic side view of the shallow water system of the invention comprising a weathervaning vessel 3 , a subsea structure 1 and a flexible transport unit 2 is shown. The subsea structure 1 is fixed to the seabed 7 . The lowest part of a weathervaning boat is keel 12. The vertical line "turret centerline" is the nominal weathervane vertical centerline. As shown, the weathervaning vessel can be located at far and near p...
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The invention relates to a shallow water system comprising a floating weathervaning vessel (3) with a topside hang-off structure, a subsea structure and at least one flexible transporting unit (2) extending from the topside hang-off structure to the subsea structure (1). The weathervaning vessel (3) has a bow with a lowermost bow midpoint. The weathervaning vessel is moored such that at still water it can weathervane around a weathervaning vertical centre line, such that the position of the lowermost bow midpoint follows an annular lowermost bow line which defines a vertical tube shaped border to a lowermost bow midpoint exclusion zone (LE-zone). The subsea structure (1) is arranged in said LE-zone. The weathervaning vertical centre line (9) is preferably the nominal weathervaning vertical centre line. The weathervaning vessel (3) is generally a line moored weathervaning vessel. The shallow water system of the invention provides a simple system for design with a high safety against damaging of flexible transporting unit (2). The shallow water system is in particular beneficial for use at very shallow water.
Description
technical field [0001] The present invention relates to a shallow water system comprising a floating weathervaning vessel, a subsea structure and one or more flexible transport units extending therebetween. Background technique [0002] Shallow water systems to which the present invention relates are well known in the art and are commonly used to transport fluids, electricity, electromagnetic waves and other media to and from floating weathervaning vessels. [0003] Floating weathervaning vessels typically contain either an external turret system or an internal turret system from which one or more flexible transport units are advanced to the subsea structure. An internal turret system guides the flexible conveying unit through the bottom of the hull, while an external turret system guides the flexible conveying unit extending from the top side suspension structure over the hull and ship rail. The invention particularly relates to shallow water systems incorporating external...
Claims
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IPC IPC(8): B63B21/50
CPCB63B21/50B63B27/24B63B21/507
Inventor C·D·克里斯坦森
Owner NAT OILWELL VARCO DENMARK