Offshore ice-resistant platform and method of construction

 

(57) Abstract:

The invention is intended for use in fixed offshore platforms, built on the shallow part of the shelf. The platform contains resistant integral with the bottom and top plates rigidly connecting the inner and outer protective from the effects of ice elements wall mounted with a gap relative to each other, and the upper structure mounted on the upper base plate and made of functional units and storage tanks for liquids and production wells that are installed inside the caisson. In the implementation of the method of construction of the platform do it with auxiliary Legoland visor and the upper support plate is smaller than the area of the bottom plate. Ludology visor set at the external contour of the upper structure and connected with the outside of the blocks and the upper support plate. Protective elements are in the form of segments of a cylinder of revolution with a conical profile in the upper part. The design of the platform allows to reduce ice loads and to increase the stability of the platform. 2 S. and 4 C.p. f-crystals, 2 Il.

The invention relates to fixed offshore structures and re the freezing seas.

Known offshore platform, in the hollow support block, which with the use of refrigeration equipment frozen ballast water, forming an artificial ice island" (see, for example, Misevic Century. And. and other Exploration and exploitation of offshore oil and gas fields. - M.: Nedra, 1978 S. 49 - 51).

The disadvantage of this design is the need for saturation platform additional refrigeration and heating equipment, improper use of the platform topsides, limited depth applications - up to 22 m, the lack of methods and technical means subsequent operation of the well cluster after removing the platform.

Also known for the design of ice-resistant platform and method of installation (see US 4963058, A, 16.10.90). A known method of installation of the ice-resistant platform provides Department-resistant sides, an open top and a closed perimeter, basin around hydraulic structures, installation of the bottom plate, drilling and subsequent commissioning.

In part of the device in the above U.S. patent describes the construction of the offshore ice-resistant platform, containing a stationary closed-resistant shell, verneal low reliability in the absence of year-round operation of the platform.

Also known for the design of ice-resistant platform and method of construction (see US 5186581, 16.02.93).

In part of the device in the above patent US 5186581 described the design of the offshore ice-resistant platform, containing ice-resistant stationary caisson made with the bottom and upper support plates rigidly connecting the inner and outer profiled flat protective from the effects of ice elements wall mounted with a gap relative to each other, and the upper structure mounted on the upper base plate and made of a technological function blocks, with tanks for process fluids and production wells are installed inside of the caisson.

Part of the installation method in the above patent describes a method of construction of the offshore ice-resistant platform, providing for the implementation of ice-resistant stationary caisson, with the bottom and upper support plates rigidly connecting the inner and outer profiled flat protective from the effects of ice elements wall mounted with a gap relative to each other, and the mounting of the upper structure on the upper base plate when it is executed from a technological punk below sea level.

When this ice-resistant elements are planar and the dihedral angle at the vertex of from 100 to 130 degrees, set vertically to reduce the tangential loads from ice massifs, including icebergs.

The main technical problem to be solved in the present invention, is to expand the field of application of the method of development of offshore fields by expanding the functionality of the device, namely, providing year-round operation of the platform on the shallow shelf freezing seas at a water depth of 10 to 40 meters while reducing material consumption design and improve the operational stability of the structure.

At the stated technical problem is solved by the fact that the offshore ice-resistant platform containing ice caisson made with the bottom and upper support plates rigidly connecting the inner and outer profiled with protection from the effects of ice elements wall mounted with a gap relative to each other, and the upper structure mounted on the upper base plate and made of a technological function blocks, and tanks for technology Legoland visor, the upper base plate is made smaller than the area of the bottom plate, while the auxiliary ludology visor installed on the external contour of the upper structure and mechanically connected to the outer part (outer side) of the functional units and the upper support plate, the protective elements in the form of segments of cylinders rotation with a tapered profile at the top.

Moreover, it has fixed offshore ice-resistant platform supporting ludology visor to perform closed and tightly coupled in the working position with the outer profiled wall to form a unified Lidorenko zone offshore ice-resistant platform.

And it is also suitable radius of curvature of the segments of the protective elements to choose greater than their width is not more than twice.

In terms of method of construction of the offshore ice-resistant platform delivered the technical problem is solved in that in the method of construction of the offshore ice-resistant platform, providing for the implementation of ice-resistant stationary caisson, with the bottom and upper support plates rigidly connecting the inner and outer profiled flat serago structure on the upper base plate when it is run from the process functional blocks and placing tanks for process fluids and production wells within the caisson below sea level, the platform additionally provide auxiliary Legoland visor, upper support plate is carried out with the smaller area compared to the area of the bottom plate, while the auxiliary ludology visor set at the external contour of the upper structure and mechanically connected with the outer part (outer side) of the functional units and the upper base plate and the protective elements are in the form of segments of a cylinder of revolution with a tapered profile at the top.

Moreover, the offshore ice-resistant platform supporting ludology visor perform closed and tightly bind in the working position with the outer profiled wall to form a unified Lidorenko zone offshore ice-resistant platform.

It is advisable to tilt the outer wall to choose exceeding the critical angle of bending of the ice.

In addition, the outer profiled wall with protective elements are tapered part in the impact zone of the ice.

It is also reasonable additional ludology visor set at a height exceeding the height of the undisturbed position of the ice field in the accumulation zone of crushed ice.

Subgenera structure and mechanically associated with the outer part (outer side) of the functional units and the upper support plate can further reduce ice loads and to increase the stability of the platform.

The implementation of the upper support plate with the smaller area compared to the area of the bottom plate with the simultaneous implementation of protective elements in the form of segments of a cylinder of revolution with a conical profile in the upper part allows to redistribute the local load from the ice and increase the efficiency of its destruction by creating the ice array of additional bending stresses.

Furthermore, implementation of auxiliary logolounge visor closed and tightly coupled in the working position with the outer profiled wall to form a unified Lidorenko zone offshore ice-resistant platform allows you to increase the overall rigidity of the structure, which also leads to increased stability of the structure.

When the angle of inclination of the outer wall is greater than the critical angle of bending of the ice, effectively breaking the ice when it is creeping on the upper tapered part of the outer ice wall.

When installing additional logolounge canopy at a height exceeding the height of the undisturbed position of the ice field in the accumulation zone of crushed ice is creating conditions for more destruction on bol is the elements.

In Fig. 1 shows a sketch of the basic part of the platform in terms of Fig. 2 is a vertical section of the platform along the section A-A.

Examples of specific implementations of the invention.

Offshore ice-resistant platform contains ice-resistant stationary d-1, made with a bottom 2 and the upper bearing 3 plates rigidly connecting the inner 4 and outer 5 profiled with protection from the effects of ice elements 6 wall mounted with a clearance of 7 relative to each other, and the upper structure 8 that is installed on the upper support plate 3 and is made from the process functional blocks 9, and the tanks 10 for process fluids and production wells that are installed inside of the casing 1.

The platform is further provided with auxiliary Legoland visor 11. The upper base plate 3 is made smaller than the area of the bottom plate 2. Auxiliary ludology visor 11 is installed on the outer contour 12 of the upper structure 8 and mechanically connected to the outer part (outer side) 13 functional units 9 and the upper support plate 3, the protective elements 6 made in the form of segments of a cylinder of revolution with a conical profile AI with the outer profiled wall 5 to form a unified Lidorenko zone offshore ice-resistant platform.

The method of construction of fixed offshore platform is implemented as follows.

Previously in dry dock made ice caisson 1 with a bottom 2 and the upper bearing 3 plates rigidly connecting the inner 4 and outer 5 profiled flat protective from the effects of ice elements 6 wall mounted with a gap relative to each other. The upper support plate 3 is carried out with the smaller area compared to the area of the bottom plate 2. The inner wall 4 of the casing 1 is installed vertically. Then on outfitting the space perform installation of the upper structure 8 with the technological modules 9 by conventional docking. Technological function modules 9 perform with auxiliary Legoland visor 11 mounted on the outer contour of the upper structure 8, and is mechanically connected with the outer part (outer side) of the functional units 9 and the upper support plate 3. The tanks 10 for process fluids and production wells are placed inside of the casing 1 below the sea level, which increases the stability of the platform as a whole. Protective elements 6 are in the form of segments of cylinders rotation with a tapered profile in the upper part 14.

With regard to the depth of the sea at the place of installation of the offshore ice-resistant platform outer shaped wall 5 with protective elements 6 comply with the conical part 14 in the impact zone of the ice.

The angle of inclination of the outer wall 5 is chosen greater than the angle of stability of ice. In relation to the operating conditions of the offshore ice-resistant platform in the eld at fault when the ice thickness of 2 to 3 meters angle stability of ice corresponds to 55 - 60o.

Moreover, additional ludology visor 11 installed at a height exceeding the height of the undisturbed position of the ice field in the accumulation zone of crushed ice.

1. Offshore ice-resistant platform, containing ice-resistant stationary caisson made with the bottom and upper support plates rigidly connecting the inner and outer profiled with protection from the effects of ice elements wall mounted with a gap relative to each other, and the upper structure mounted on the upper base plate and made of a technological function blocks, and tanks for process fluids and production wells that are installed inside of the casing, characterized in that it is in the area of the bottom plate, when this auxiliary ludology visor installed on the external contour of the upper structure and mechanically connected to the external part of the functional units and the upper base plate and the protective elements in the form of segments of cylinders rotation with a tapered profile at the top.

2. Platform under item 1, characterized in that the auxiliary ludology visor is made closed and tied in position with the outer profiled wall to form a unified Lidorenko zone offshore ice-resistant platform.

3. The method of construction of the offshore ice-resistant platform, which perform the ice-resistant stationary integral with the bottom and upper support plates rigidly connecting the inner and outer profiled flat protective against exposure to the ice wall elements, which are mounted with a gap relative to each other, carry out installation of the upper structure on the upper base plate when it is run from the process functional blocks within the caisson below sea level install tanks for process fluids and production wells, wherein the platform is implemented with auxil the Onna plate, when this auxiliary ludology visor set at the external contour of the upper structure and mechanically connected with the outer part of the functional units and the upper base plate and the protective elements are in the form of segments of a cylinder of revolution with a tapered profile at the top.

4. The method according to p. 3, characterized in that the auxiliary ludology visor perform closed and tightly bind in the working position with the outer profiled wall to form a unified Lidorenko zone offshore ice-resistant platform.

5. The method according to PP.3 and 4, characterized in that the outer profiled wall with protective elements are tapered part in the impact zone of the ice.

6. The method according to PP.3, 4 or 5, characterized in that the auxiliary ludology visor installed at a height exceeding the height of the undisturbed position of the ice field in the accumulation zone of crushed ice.

 

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10 dwg

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