Complex for installation of fixed offshore platform and method of transportation and installation through complex for installation of fixed offshore platforms

 

(57) Abstract:

The invention can be used in the field of hydraulic structures, in particular in the means for the development of the continental shelf. In the complex for installation of fixed offshore platforms, containing the pontoon with lifting mechanisms, the pontoon is made in the form of a floating dock with towers, and a lifting mechanism mounted inside the towers and equipped with devices for attaching to the hull of the platform. In the method of transportation and installation through complex for installation of fixed offshore platforms using pontoon with lifting mechanisms for transporting platform building platform is placed on the towers of the floating dock so that the support legs are beyond the dimensions of the towers, while the support part of the rack platform feature below the main plane of the floating dock, and at the approach to the place of installation of the platform by means of a lifting mechanism to raise the alignment of the bearing parts with the level of the main surface of the floating dock. Then lifting mechanisms lower the platform to the ground, the device for fastening attached floating dock to the body and crush the stand into the ground. Then floating dock is disconnected from the housing platformie operational capabilities by providing the ability to mount a stationary offshore platforms in shallow waters at depths from 4 to 1 m while simplifying the design of the complex. 2 S. and 1 C.p. f-crystals, 6 ill.

The invention relates to the field of hydraulic structures, and more particularly to means for the development of the continental shelf.

Known systems for mounting and means of transportation and installation of fixed offshore platforms, which includes a special craft for guidance and installation using them topside of the platform preset on the ground (see,for example, application great Britain N 2176827, M. CL.6E 02 B 17/00, NCI E 1 H, 1987).

The disadvantage of these known systems and methods is the need to first establish a Foundation and structural complexity due to the presence of a large number of hydro-pneumatic elements and the guidance of the upper structure on the base, and most importantly, the inability to use complex in shallow water at depths less than 4 m*

Known complex for installation of fixed offshore platforms and the method of transportation and installation through complex for installation of fixed offshore platforms, body and legs, with the use of the pontoon with lifting mechanisms (see, U.S. Pat. The Netherlands N 135005, Ál6E 02 B 17/00 from 1972 and is the complexity of the structures due to the presence of Jack-up pontoon with moving legs and the inability to use this method and device for mounting platforms at sea depths of less than 4 meters.

The technical result of the claimed complex and method is the enhanced operational capabilities by providing the ability to mount a stationary offshore platforms in shallow waters at depths from 4 to 1 meters, while simplifying the structure of the complex.

This is achieved in the complex for installation of fixed offshore platforms, body and legs containing the pontoon with lifting mechanisms, the fact that the pontoon is made in the form of a floating dock with towers, and a lifting mechanism mounted inside the mentioned towers and equipped with devices for attaching to the hull of the platform.

In addition, in the complex for installation of fixed offshore platforms, devices for attaching to the chassis platform is designed in the form of rods, interacting with reinforcements of the hull of the platform.

This technical result is also achieved in the way of transportation and installation through complex for installation of fixed offshore platforms, body and legs, with the use of the pontoon with lifting mechanisms for transporting the case of fixed offshore platforms are placed on towers, floating dock so that the supporting rack n platform while supporting part of the uprights feature below the main plane of the floating dock, and at the approach to the place of installation of the platform by means of a lifting mechanism towers rise up to alignment reference parts of its racks with the level of the main surface of the floating dock, then use the mechanisms of the rise of the lower platform to ground through devices for fastening attached to the floating dock to the hull of the platform and make the push the posts into the ground, after which the floating dock is cut off from the body of the platform and removing it from the installation site.

In Fig. 1 schematically shows a General view of the proposed complex for installation of fixed offshore platform (floating dock with a pre-installed platform);

in Fig. 2 is a view from the Board by a of Fig.1 in the transport position;

in Fig. 3 is a view from the Board by a of Fig.1 at the time of the finding of the floating dock on the position of the platform (platform raised above the towers floating dock);

in Fig.4 - cross section a-a of Fig.2; Fig.5 - section b-B of Fig.4;

in Fig. 6 is a view from the Board by a of Fig.1 at the time the floating dock from under installed on the ground of the platform.

The inventive complex for installation of fixed offshore platform contains the pontoon 1 made in the form of a floating dock with towers 2. the 1 mounted lifting mechanism 6, equipped with devices for attaching to the housing 3 of the platform, namely the reinforcements 7, made in the form of rods 8 connected to the hydraulic cylinders 9 and interacting with reinforcements 7. The platform is fixed on the ground 10.

The inventive method of transportation and installation of fixed offshore platforms through complex for installation is as follows:

For transportation of the body 3 fixed offshore platforms are placed on towers 2 floating dock 1 so that the support legs 4 are for the dimensions of the towers 2. While supporting part 5 of the uprights 4 are located below the main plane (OP) floating dock 1.

At the approach to the place of installation of the platform by means of a lifting mechanism 6 towers 2 raised to the alignment reference parts 5 it stands 4 level main plane (OP) for output to a minimum depth of water is about 1 meter. Then using a lifting mechanism 6 lower platform to the ground 10. By means of devices for fastening attached to the floating dock 1 to the housing 3 platform, which thrust 8 by means of hydraulic cylinders 9 is injected into engagement with reinforcements 7 of the housing 3. Produce, push the support legs 4 into the ground 10 with a lifting mechanism 6, passing thereby in the C gearing with reinforcements 7 by means of hydraulic cylinders 9. The hydraulic cylinders 9 are produced from the hydraulic actuator, placed on the floating dock 1 (hydraulic actuator not shown).

After that, the floating dock 1 away from the installation site (the one installed on the ground platforms).

The inventive system for mounting and method of transportation and installation through complex for installation of fixed offshore platforms support installation of fixed offshore and Jack-up platforms in shallow water at the minimum depths less than 4 and up to 1 m while simplifying the design of the complex through the use of existing Platonov with a slight modernization associated with retrofitting towers lifts.

The proposed complex and method of transportation and installation significantly enhance operational capabilities by expanding the area of operation and maintenance of the shallow shelf from 20 to 1 m

1. Complex for installation of fixed offshore platforms, body and legs containing the pontoon with lifting mechanism, wherein the pontoon is made in the form of a floating dock with towers, and a lifting mechanism mounted inside the mentioned towers and equipped with devices for fastening to building the device to attach to the chassis platform is designed in the form of rods, interacting with reinforcements of the hull of the platform.

3. The method of transportation and installation through complex for installation of fixed offshore platforms, body and legs, with the use of the pontoon with lifting mechanisms, characterized in that transfer case fixed offshore platforms are placed on towers, floating dock so that the support legs are beyond the dimensions of the towers, with the lifting mechanism, equipped with devices for attaching to the hull of the platform, while supporting part of the uprights feature below the main plane of the floating dock, and at the approach to the place of installation of the platform by means of a lifting mechanism towers rise up to alignment reference parts of its racks with the level of the main surface of the floating dock, then use the mechanisms of the rise of the lower platform to the ground, with devices for fastening attached floating dock to the hull of the platform and make the push the posts into the ground, and then floating dock is cut off from the body of the platform and removing it from the installation site.

 

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