RU2502629C2 - Floating platform and method of its control - Google Patents

Floating platform and method of its control Download PDF

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Publication number
RU2502629C2
RU2502629C2 RU2010150346/11A RU2010150346A RU2502629C2 RU 2502629 C2 RU2502629 C2 RU 2502629C2 RU 2010150346/11 A RU2010150346/11 A RU 2010150346/11A RU 2010150346 A RU2010150346 A RU 2010150346A RU 2502629 C2 RU2502629 C2 RU 2502629C2
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RU
Russia
Prior art keywords
platform
water level
ice
central axis
downward
Prior art date
Application number
RU2010150346/11A
Other languages
Russian (ru)
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RU2010150346A (en
Inventor
Коре СЮВЕРТСЕН
Ян Видар ОШНЕС
Альф Рейдар СОНДСТАД
Original Assignee
Севан Марине Ас
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Priority to NONO2008218909 priority Critical
Priority to NO20082189A priority patent/NO336984B1/en
Application filed by Севан Марине Ас filed Critical Севан Марине Ас
Priority to PCT/NO2009/000177 priority patent/WO2009136799A1/en
Publication of RU2010150346A publication Critical patent/RU2010150346A/en
Application granted granted Critical
Publication of RU2502629C2 publication Critical patent/RU2502629C2/en

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B63SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63BSHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B35/00Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
    • B63B35/44Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
    • B63B35/4413Floating drilling platforms, e.g. carrying water-oil separating devices
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B63SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63BSHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B75/00Building or assembling floating offshore structures, e.g. semi-submersible platforms, SPAR platforms or wind turbine platforms
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B63SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63BSHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B2211/00Applications
    • B63B2211/06Operation in ice-infested waters
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B63SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63BSHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B2241/00Design characteristics
    • B63B2241/02Design characterised by particular shapes
    • B63B2241/04Design characterised by particular shapes by particular cross sections
    • B63B2241/06Design characterised by particular shapes by particular cross sections circular

Abstract

FIELD: transport.
SUBSTANCE: invention relates to floating platforms. Floating platform for waters with ice comprises gull with outer sidewalls and metalling device. Hull is symmetric about platform vertical central axis and is closed at lower part by bottom. Platform draft is notably smaller than platform diameter. Platform floatability centre for its submerged part is located lower than centre of gravity of the platform. Said symmetric outer side of the hull includes at least three sections: water level section, cylindrical mid section and bottom section. Water level section features diameter decreasing downward along central axis. In operation in waters with ice, sea water level is located in water level section. Bottom section features diameter increasing downward along central axis. Metalling device serves for selective raise or descent of the platform so that water level is located nearby water level section or in mid section. Proposed method comprises actuating aforesaid metalling device for selective raise or descent of the platform depending on whether the platform is in water with ice or without it.
EFFECT: minor damages caused by ice.
9 cl, 4 dwg

Description

The present invention relates to floating platforms and, more specifically, to floating platforms used for work on the high seas.

A wide range of ideas is applied to hydrocarbon drilling, production and storage of produced hydrocarbons at sea, and for other applications. One idea is to use a floating installation, which can be a ship, a semi-submersible or a floating platform. Patent Publication No. 319971 describes an offshore platform for drilling for hydrocarbons or for producing hydrocarbons. Additionally described is a platform designed in the form of a vertical, mainly flat-bottomed cylinder, characterized in that the platform body in the lower part of the cylinder is equipped with at least one peripheral circular cut formed by an annular element under the cut and the diameter of the platform body is significantly exceeds its draft, and the center of buoyancy of the submerged part of the platform is lower than the center of gravity of the platform. This design showed the presence of a predominantly large capacity for both oil storage and cargo on deck. In addition, the construction cost is low, the assembly period is short, and great flexibility is achieved for different applications. Such a platform can be positioned by placing on dispersed anchors, and a turret or swivel is not needed to hold the risers / hoses and anchor ropes. A round or mainly rounded cross section is useful because rotation depending on weather conditions is not necessary, and it has been shown that the movement and loads on the platform are unexpectedly small compared to other types of floating units. Thus, tensile and tension levels are limited. The shape of the casing provides a compact design that contributes to the fact that the loads from the waves have only a limited degree of influence on the forces of tension and tension.

However, there is a need for an additionally improved version of such a floating platform, especially a platform that is particularly suitable for use in ice-containing waters, in addition to other waters.

The aforementioned need is satisfied by the present invention, in which a floating platform for drilling, production, storage or other applications, especially suitable for water containing ice, is developed, said platform containing

a housing with external side walls, which is mainly located rotationally symmetrical around the vertical central axis of the platform and is closed at the bottom by a bottom,

a deck at the upper end of the hull, conveniently equipped according to the intended use,

moreover, the draft of the platform is significantly smaller than the diameter of the platform, and the center of buoyancy of the platform for the submerged part is lower than the center of gravity of the platform.

The platform according to the invention is characterized in that

basically, the symmetrical outer side of the housing includes at least three sections read from the upper end of the housing:

a water level section having a diameter decreasing in a downward direction along the central axis, wherein during operation in waters containing ice, the sea water level is located in said water level section,

a cylinder-shaped intermediate section, and

a lower section having a diameter increasing in a downward direction along a central axis.

Since the casing is generally symmetrical around the vertical central axis of the platform, it follows that the casing has a circular shape formed by a side wall. This means that the outer side wall of the polygonal shape, such as an assembly of a plurality of connected flat sheets along the periphery, should be formed generally symmetrically around the central axis.

During operation in ice-free waters, the ratio between the sediment of the platform and the diameter at the water level is preferably 0.2-0.3, and the water level may be at the intermediate part of the housing. When operating in ice-containing waters, the ratio between the platform sediment and the diameter at the water level is preferably about 0.3-0.4. As a rule, the preferred ratio is approximately 0.3.

The water level section preferably has an inward slope in the downward direction at an angle of about 45 °, which is considered preferable to breaking the ice and to the prevailing forces. The inclination of the lower section is preferably approximately 45 ° outward, when viewed in a downward direction, which is considered advantageous in relation to the movement of ice radially from the platform. The lower section helps to give the ice movement that prevents it from falling under the hull. However, other inclinations may be applicable. The transition between the sections can be sharp or smooth, so that the shape may resemble an hourglass or the inside of the letter U. The usual sizes of the sections are the height of the section of the water level, equal to 10-15 m, the height of the intermediate section, equal to 5-15 m, and the height of the lower section, equal to 2-4 m. The dimensions of the sections may exceed the limits mentioned above, and depend on the thickness of the ice and other expected ice conditions in the planned area of work, as well as on the size and draft of the platform.

For use as a production and storage device, the platform preferably comprises a downward extending removable element (connecting element) with its inherent buoyancy, located coaxially with the vertical central axis of the platform and removed from the lower edge of the walls of the outer side for connecting and / or passing anchor ropes, chains, risers and / or cables. Such a removable element is preferred for water containing ice, since risers, hoses, cables, anchor ropes and chains are drawn from the perimeter and are thus protected from ice, and the unprotected connection area is pulled down a certain distance below the bottom of the platform. Any ice falling under the platform should be moved a fairly large distance inward to the center of the platform in order to reach the junction area, so the ice should probably be raised to the bottom of the platform and does not touch any risers, anchor ropes and the like. In case of arrival of a large iceberg, the connecting element can be disconnected; after which it will plunge to a safe depth, determined by the balance between the buoyancy of the connecting element and the weight of the attached devices. The removable connecting element extends at least 10 m under the bottom of the platform before meeting the area for connecting / passing risers.

For some platform applications, especially in deep waters, anchoring is not necessary, and for some applications a connecting element is not necessary. For some applications, such as during deep water drilling, dynamic positioning can be used to position a floating platform.

Together with the present invention, there is also developed a method of operating in ice-containing waters of a floating platform according to the present invention, characterized in that the platform is loaded with ballast so that the water level is located in the water level section by operating the integrated ballasting devices.

Extensive testing of the floating platform according to the invention at various scales and under wide ranges of conditions showed unexpectedly positive results.

The present invention, as well as its advantages, are illustrated by means of four drawings, in which:

1 shows a floating platform according to the invention,

figure 2, 3 and 4 shows comparable information between the circular vertical platforms Sevan, one of the types of which is a real platform, a semi-submersible platform and a vessel, respectively, and

figure 2 shows information for moving the heave,

figure 3 shows information for moving the pitching, and

figure 4 shows information for moving the rolling side.

Figure 1 shows a side view of a floating platform according to the present invention. In more detail, a floating platform 1 is shown, comprising a hull 2, which is generally symmetrical around the central axis of the platform and is closed at the bottom by a bottom 3. At the upper end of the hull, deck 4 is equipped according to the intended use. From the drawing it is clear that the draft of the platform is significantly smaller than the diameter of the platform. It is not so obvious that the center of buoyancy of the submerged part of the platform is lower than the center of gravity of the platform. It is easy to see that the rotationally symmetrical outer side of the housing 2 includes at least three sections read from the upper end of the housing, namely:

a water level section 5 having a diameter decreasing in a downward direction along a central axis, wherein during operation in waters containing ice, the sea water level is located in this water level section,

a cylinder-shaped intermediate section 6, and

a lower section 7 having a diameter increasing in a downward direction along a central axis.

In the downward direction, the water level section tilts inward to the central axis at an angle of approximately 45 °, while the lower section tilts outward at an angle of approximately 45 °. The ratio between sediment and platform diameter at the water level is approximately 0.3. Additionally illustrated is a downwardly extending removable element (connecting element) 8 located coaxially with the vertical central axis of the platform and retracted so that it is located far from the lower edge of the outer side walls of the housing. The connecting element 8 is designed to connect the risers, anchor ropes / chains, hoses, cables and the like, as needed. The area for connecting the risers is at least 10 m lower than the bottom of the platform, which is useful in waters containing ice.

During operation in waters containing ice, the platform is loaded with ballast so that the water level is at the water level section. In addition, it is considered useful to position the water level so that the upper edge of the level corresponds to the upper part of the water level section. During operation in ice-free waters, the ballast loading may be such that the water level is in the cylinder-shaped intermediate section 6, because the cylinder shape with vertical sides at the water level gives the platform less movement.

The floating platform can have many uses and is easily equipped both on deck and inside according to the intended use. In addition, the platform can be used as a floating oil production, storage and unloading system (FPSO (Floating Production Storage Offloading)), a floating oil production unit (FPU (Floating Production Unit)), a mobile offshore drilling rig (MODU (Mobile Offshore Drilling Unit) )), a multi-purpose auxiliary vessel (MSV (Multipurpose Support Vessel)), a floating system for producing liquefied natural gas (FLNG (Floating Liquified Natural Gas Production)), Gas Through the Wire (GTW (Gas Through Wire)), that is, a marine power station, floating drilling, oil production, storage and unloading system (FDPSO (Floating Drilling Production Storage Offloading)), floating w loi unit (FAU (Floating Accomodation Unit)), i.e., dwelling, or other applications.

The well-known advantages of the platform design with respect to movement in turbulent waters are illustrated in FIGS. 2, 3, and 4. FIG. 2 shows the vertical motion curves for stationary platforms with rotational symmetry (Sevan) and semi-submersible platforms and vessels in counterpropagating and lateral waves. , respectively. Figure 3 shows the keel pitching under the same conditions for the Sevan platform, semi-submersible platform for counterpropagating waves and for the vessel for counterpropagating waves, and it is obvious that the Sevan design as a whole is useful in many operating conditions. Figure 4 shows the side rolling of the same floating units under appropriate conditions, and it is obvious that the Sevan design has very useful properties, which are close to the semi-submersible installation, while the vessel has a relatively significantly larger side rolling.

Due to the very limited storage capacity and carrying capacity, as well as the low applicability in waters containing ice, semi-submersible platforms cannot be compared with a real floating platform, since the functionality is insufficient.

As mentioned, extensive testing revealed that the properties of the floating platform of the invention are surprisingly useful in ice-containing waters. Additional tests were carried out in which ice moved to the platform model at a scale of 1:40. In waters containing ice, as mentioned, it is imperative that the water level is at the water level section, which means that the ice will naturally be broken down towards the hull. At the same time, the housing will be subject to the action of a force that has a component in the upward direction. In order not to be limited by any theories, it is assumed that the incoming ice exerts force on the platform and accumulates near the platform so that the platform rises slightly from the side facing the moving ice (towards the windward side) until the moment due to the buoyancy of the platform will become stronger than the moment applied by ice. Thus, the platform shakes or sways around the horizontal axis, but the design of the platform entails that by shaking the platform, the moment due to buoyancy increases much faster than the moment applied by ice, which entails very moderate movement, and this effect is considered especially pronounced when the water level is in the water level section. When a certain amount of ice accumulates at the side of the water level section, a balance of forces will be achieved, but the inherent ability of the platform to adjust the moment due to buoyancy will be significantly changed by significantly moving the buoyancy center to the side (the distance between the center of gravity and the buoyancy center increases), which will entail tilt / rotation of the platform back to its initial position, while the ice will be broken and deflected in the downward direction. The movement of the water flow and the movement of the platform direct the ice down along the intermediate section, after which the ice is directed by the water flow further down along the lower section and deviates in the direction from the central axis along the outer surface of the lower section. This ice bends / breaks, goes down and goes in the opposite direction against the direction of the moving ice, after which the ice again pops up in the form of smaller fragments and goes around the platform by means of an increased water flow rate next to the wall of the platform. The ice breaks very efficiently and effectively moves around the platform without causing any damage. Moderate shaking of the platform helps reduce friction between ice fragments and the platform, thereby creating a stream of water directed radially outward when the platform sways back. The pitching movement or the pitching movement seems to adapt to its natural frequency. The flow rate of water around the platform is higher than in the surrounding water, since the water should follow the path around the platform. This helps to move ice fragments on the "water cushion" around the platform. However, the flow of water entering the platform can also be divided into the flow passing under the platform, especially in the case of a large platform, as this means a shorter or simpler flow path than the entire path around the platform. This can cause ice fragments to fall under the platform, which is undesirable, but the shape of the lower section has proven effective in preventing ice from getting under the platform, as mentioned above, in addition to contributing to an improved “water cushion” effect.

The platform’s behavior in the presence of ice was measured and captured on film, which confirms that, as a rule, it has a vertical roll of no more than 6 ° even if there is a century of ice during the first year in the Arctic and very small accelerations in all degrees of freedom. It should be mentioned that other ideas of floating platforms showed the presence of large unacceptable displacements at the same ice loads in the form of “spasmodic” displacements, sometimes with great accelerations. Both displacements and the amount of ice accumulating in this platform are very small, therefore, “spasmodic” movements and large accelerations are almost absent.

The platform is preferably equipped with a power unit for assembly work, and this power unit is also preferably configured to be used for washing with a screw in the region around the lower section with action in the direction of the surface on the side of the windshield and outward in the direction of the sides.

Claims (9)

1. A floating platform (1), intended for water containing ice, containing:
housing (2) with external side walls, which is mainly
is symmetrical around the vertical central axis of the platform and is closed at the bottom by a bottom (3),
a deck (4) at the upper end of the hull,
moreover, the draft of the platform is significantly smaller than the diameter of the platform, and the center of buoyancy of the platform for the submerged part is lower than the center of gravity of the platform,
characterized in that,
the substantially symmetrical outer side of the housing (2) includes at least three sections read from the upper end of the housing:
- a section (5) of the water level having a diameter decreasing in a downward direction along the central axis, and during operation in waters containing ice, the sea water level is located in said water level section,
a cylindrical intermediate section (6), and
a lower section (7) having a diameter increasing in a downward direction along a central axis, wherein
the platform also contains a ballasting device for selectively raising or lowering the platform body in water so that the water level is at the water level section (5) or in the intermediate section (6).
2. The platform according to claim 1, characterized in that the ratio between the sediment of the platform and the diameter at the water level is approximately 0.3.
3. The platform according to claim 1, characterized in that the water level section (5) has an inward slope in the downward direction at an angle of about 45 °.
4. The platform according to claim 1, characterized in that the inclination of the lower section (7) is approximately 45 ° outward when viewed in a downward direction.
5. The platform according to claim 1, characterized in that it comprises a removable downward extending element (8) with its inherent buoyancy, located coaxially with the vertical central axis of the platform and removed from the lower edge of the walls of the outer side.
6. The platform according to claim 5, characterized in that the removable element extending downward (8) is a connecting element for connecting and / or passing anchor ropes, chains, risers and / or cables.
7. The platform according to claim 5 or 6, characterized in that the removable element extending downward extends under the bottom of the platform before detecting an area for connecting / passing risers and anchor ropes.
8. A platform according to any one of the preceding paragraphs, characterized in that the floating platform (1) is a drilling platform, a production platform or a storage platform.
9. The method of operation of the floating platform according to one of claims 1 to 8, characterized in that depending on whether the platform is in ice-containing waters or not, a ballasting device is activated on the platform to selectively raise or lower the hull platforms in the water so that the water level is at the water level section (5) or at the intermediate section (6).
RU2010150346/11A 2008-05-09 2009-05-08 Floating platform and method of its control RU2502629C2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
NONO2008218909 2008-05-09
NO20082189A NO336984B1 (en) 2008-05-09 2008-05-09 Floating platform and method for operation thereof
PCT/NO2009/000177 WO2009136799A1 (en) 2008-05-09 2009-05-08 Floating platform and method for operation thereof

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RU2010150346A RU2010150346A (en) 2012-06-20
RU2502629C2 true RU2502629C2 (en) 2013-12-27

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CN (1) CN102015436B (en)
CA (1) CA2723410C (en)
DK (1) DK179027B1 (en)
NO (1) NO336984B1 (en)
RU (1) RU2502629C2 (en)
WO (1) WO2009136799A1 (en)

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RU2591110C1 (en) * 2015-03-02 2016-07-10 Федеральное государственное унитарное предприятие "Крыловский государственный научный центр" Sea floating process platform for drilling and/or production and storage in ice conditions
RU2684939C2 (en) * 2015-02-24 2019-04-16 Джуронг Шипъярд Пте Лтд. Floating installation

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US10093394B2 (en) 2009-11-08 2018-10-09 Jurong Shipyard Pte Ltd. Method for offshore floating petroleum production, storage and offloading with a buoyant structure
US9266587B1 (en) 2009-11-08 2016-02-23 Jurong Shipyard Pte Ltd. Floating vessel
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NO336206B1 (en) 2011-02-01 2015-06-15 Sevan Marine Asa Production unit for harvesting hanging risers and custom hull and a moonpool
NO20110173A1 (en) * 2011-02-01 2012-08-02 Sevan Marine Asa Production unit suitable for using dry ventiltraer
WO2013022484A1 (en) 2011-08-09 2013-02-14 Ssp Technologies, Inc. Stable offshore floating depot
CN103085946B (en) * 2012-10-15 2016-04-13 大连理工大学 Docking circular table Floating Production oil storage system
NO339535B1 (en) * 2013-01-11 2016-12-27 Moss Maritime As Fluid unit and method for reducing the pitching and rolling movements of a floating unit
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RU2591110C1 (en) * 2015-03-02 2016-07-10 Федеральное государственное унитарное предприятие "Крыловский государственный научный центр" Sea floating process platform for drilling and/or production and storage in ice conditions

Also Published As

Publication number Publication date
DK201070011A (en) 2010-03-09
RU2010150346A (en) 2012-06-20
WO2009136799A1 (en) 2009-11-12
NO20082189L (en) 2009-11-10
CN102015436A (en) 2011-04-13
DK179027B1 (en) 2017-09-04
CA2723410C (en) 2015-04-14
NO336984B1 (en) 2015-12-07
CN102015436B (en) 2015-10-21
CA2723410A1 (en) 2009-11-12

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Effective date: 20190222