RU2757512C1 - Semi-submersible multipurpose marine complex - Google Patents

Abstract

FIELD: shipbuilding.

SUBSTANCE: invention relates to shipbuilding field and concerns construction of semi-submersible multipurpose floating platforms, in particular drilling platforms, offshore platforms, helicopter platforms, raid floating berths and others. A semi-submersible multipurpose marine complex is proposed, containing a floating semi-submersible platform consisting of a hull and pontoons rigidly connected to each other by means of support columns, equipped with anchor retention system. The complex also includes a towed gravity foundation, which is a reinforced concrete structure consisting of a hollow base and hollow columns equipped with docking nodes designed to fix a semi-submersible platform on gravity foundation, at the same time, the semi-submersible platform can be fixed at its installation place either by fixing it on a gravity foundation, or autonomously using an anchor retention system.

EFFECT: invention expands functionality of complex during its operation.

4 cl, 6 dwg

Description

Technology area

The invention relates to structures of semi-submersible floating offshore platforms for various purposes, in particular drilling platforms, offshore loading platforms, helicopter platforms, offshore floating berths and others.

State of the art

A known offshore autonomous complex for oil production, a semi-submersible floating drilling platform, an offshore production stand for pumping oil, an ice-resistant floating platform for oil production, an ice-resistant floating tank for collecting and storing oil, an anchor for floating structures at sea (patent for a useful model of the Russian Federation No. 86231, publ. 27.08.2009, IPC Е21В 43/00). The technical task of the group of utility models is to increase the reliability and expand technological capabilities when drilling wells and year-round operation of a cluster of wells on the offshore shelf, incl. in ice conditions at great depths without the use of divers and robotic manipulators.

In accordance with the patent, the offshore autonomous complex for oil production includes a semi-submersible floating drilling platform equipped with mounting and drilling equipment and main pontoons with racks, which is double-decked, while on the lower deck there is a mounting and drilling subdeck with height adjustment, racks of the main pontoons are telescopic, in addition, the platform is equipped with auxiliary pontoons with stands, an active-passive horizontal stabilization system and an anchor system.

The disadvantage of this analogue is that the well-known offshore autonomous complex is highly specialized, since its field of application is limited only to oil production.

Known marine submersible oil loading berth of ice class (patent for invention of the Russian Federation No. 2228876, publ. 20.05.2004, IPC В63В 35/44), intended for receiving and loading ships, for example, oil tankers, in the conditions of the coastal (shallow water) of the Arctic sea, which contains interconnected floating elements made in the form of pontoons-tanks with the possibility of heating the oil stored in them and forming a chamber in the plan, fenced off by two longitudinal walls, a transverse wall and a hydraulic gate opposite to the latter, while the berth is made with the possibility of delivering it in assembled form to the specified area and installations on the coastal seabed or retractable supports. Due to this design of the berth, an increase in its operational reliability is achieved in the shallow waters of the Arctic sea.

The disadvantage of this analogue is also that the scope of its application is limited only to loading ships with oil.

Known floating drilling rig (patent for invention of the Russian Federation No. 2651328, publ. 19.04.2018, IPC В63В 35/44), which includes the middle and side support pontoons, and located on them drilling platform. The platform is connected to the pontoons by racks that connect the platform to the side support pontoons, which are made in the form of telescopic hydraulic cylinders. The pontoons are equipped with an air supply system under their bottom, including an air blower, a pipeline and air nozzles connected to it, installed on the bottom of the pontoons. Due to this design, unhindered autonomous movement through the water in shallow water conditions is achieved.

The disadvantage of this analogue is that the scope of its application is limited only to oil production.

Known wave-resistant offshore lifting platform (VMGP) (patent for invention of the Russian Federation No. 2561491, publ. 27.08.2015, IPC В63В 35/44, В63В 35/00, В63В 27/00, В63С 7/02), designed to perform underwater technical and ship lifting works. Due to the pontoons of an oval elongated upward shape, the VMHP has wave resistance in the surface position against waves of limited intensity with partial filling of ballast tanks and increased wave resistance with complete flooding of all ballast tanks and submersion of the columns by about 1.2 of the calculated wave amplitude. The technical result consists in expanding the functionality of the wave-resistant offshore platform.

The disadvantage of this analogue is that the scope of its application is limited only to underwater technical and ship lifting operations.

The closest analogue of the claimed invention, selected as a prototype, is an offshore semi-submersible helicopter platform (patent for invention of the Russian Federation No. 2475407, publ. 20.02.2013, IPC В63В 35/44, В63В 35/73, В63В 21/50, В63В 22/02 ), intended for use as floating heliports.

The offshore semi-submersible helicopter platform contains an upper hull with a helicopter complex, connected to the lower pontoons by means of stabilizing columns and equipped with an anchor holding system. The platform is also equipped with propulsion means with a control system that corrects the position of the platform relative to the wind direction at the current moment to ensure takeoff and landing of helicopters.

The disadvantage of the prototype is that it is intended only for use as a floating heliport.

The essence of the invention.

The technical problem to be solved is a narrow specialization and limitations in the field of application of known structures of semi-submersible platforms, which does not allow them to be used for solving various problems.

The technical result of the claimed invention is to expand the functionality of the application of the marine semi-submersible platform.

The specified technical result is achieved due to the design of a semi-submersible multipurpose marine complex (PMMK), consisting of a floating semi-submersible platform and a towed gravity foundation, which is designed to secure a semi-submersible platform on it.

In this case, the semi-submersible platform can be fixed in place of its installation in the sea both by fixing it on the gravity foundation, and autonomously using an anchor holding system.

The floating semi-submersible platform consists of a hull with a deck and a hold, while the hull is rigidly connected by means of support columns with hollow pontoons, which are also interconnected by means of rigid transverse links.

In the bow of the deck of the platform hull there is a superstructure in which a control room and crew accommodation can be located, and on both sides of the deck there are rails on which an automatic loading / unloading crane system is installed, consisting of at least two gantry cranes equipped with a dynamic stabilization system for handling containers in rough seas (for example, STS4101S cranes manufactured by SANY).

The hull of a semi-submersible platform can be made of a rectangular shape with a length of at least 238 meters, a width of at least 72 meters and a height of at least 12 meters, while the dimensions of the hull allow storing sea containers in four tiers in the hold of a semi-submersible platform. The total capacity of one cargo hold is 6000 TEU (TEU is the volume of a 20-foot container). The hold may also contain other cargo, special equipment, or tanks with liquefied natural gas or oil of an equivalent volume.

The body of the semi-submersible platform also accommodates:

- general ship systems: drainage system; ballast; tank monitoring system (for example, Cargomaster); trim system; water supply systems; refrigeration system; heating, ventilation and air conditioning systems; fire-fighting system; as well as control and monitoring systems for general ship systems;

- an electric power system, including: a ship's gas turbine power plant (GTEU) used during the installation of the platform on the gravity foundation; two marine diesel generator sets used during platform installation at anchor; switchboards and power converters used to provide AC and DC power supply to power systems, lighting, signaling and communication systems, household equipment, general ship systems and auxiliary equipment.

The supporting columns of the semi-submersible platform are watertight, have a rectangular profile with sides of at least 5 meters and are made at least 20 meters high. The number of support columns on the platform is not less than 8. Chain boxes of the anchor system are located in the support columns. Through them there are pipelines connecting the tanks (fuel, ballast, fresh water) located in the pontoons with the corresponding pumps located in the rooms of the upper building. The support columns also contain chain pipes of the anchor system, cables for lighting systems, communication, valve control, monitoring and signaling of ship tanks.

The pontoons of a semi-submersible platform are a structure with a rectangular profile and a length equal to the length of the platform body, having sharpened contours at both ends, interconnected by rigid, for example, tubular ties with a diameter of at least 2 meters. The pontoons are at least 10 meters high and at least 7 meters wide. The pontoons are equipped with fuel, ballast tanks, which are used for automated trimming by roll and trim, as well as tanks for fresh water.

The semi-submersible platform is equipped with an anchoring system, including gravity anchors, which can be made, for example, in the form of reinforced concrete blocks, and also equipped with an automatic mooring system for vessels, including in rough sea conditions (for example, MoorMaster from Cavotec).

In the aft part of the upper deck of the platform, a helipad with a take-off / landing control point can also be mounted.

In order to install the platform on a gravity foundation, docking nodes are located in the lower part of its body. At the same time, to ensure maneuvering when installing the platform on a gravity foundation, or, if necessary, to perform other tasks, the platform is moved using four rotary rowing electric motors located side by side in the fore and aft parts of the platform on transverse links installed between the pontoons.

After the platform is installed on a gravity foundation, the platform can be connected to the onshore gas pipeline using a gas intake pipe.

The gravity bed is a reinforced concrete hollow structure towed to the installation site on a pre-prepared seabed surface. The length of the gravity base is equal to the length of the semi-submersible platform, the width is at least 90 meters, and the height is at least 50 meters. The depth of installation of the gravity foundation is 35 - 40 meters.

The gravity foundation consists of a reinforced concrete hollow base and reinforced concrete hollow columns equipped with docking nodes that serve to secure the semi-submersible platform. A gas pipeline can be attached to one of the columns, which serves to connect to the onshore gas pipeline, and a linear compressor station in a sealed steel container can be installed in the center of the reinforced concrete base, serving to compensate for pressure losses in the main gas pipeline.

Due to this design, the PMMC has expanded functional capabilities during its operation, which allow installing a floating semi-submersible platform both on a gravity foundation and autonomously using an anchor holding system.

The essence of the claimed design of the PMMC is illustrated by drawings:

in FIG. 1 shows a semi-submersible platform installed on a gravity foundation (front view);

in FIG. 2 shows a semi-submersible platform installed on a gravity foundation (side view);

in FIG. 3 shows the construction of a semi-submersible platform (side view);

in FIG. 4 shows the structure of a semi-submersible platform (front view);

in FIG. 5 shows the structure of the gravity foundation (side view);

in FIG. 6 shows the structure of the gravity foundation (front view).

FIG. Figures 1 and 2 show a semi-submersible platform (1) mounted on a towed gravity base (2). In the drawing, the sea level is shown with a dotted line.

The semi-submersible platform (1) (Figs. 3 and 4) consists of a body (3) rigidly connected by means of support columns (4) with hollow pontoons (5), interconnected by means of rigid transverse ties (6). The semi-submersible platform (1) contains an anchoring system equipped with gravity anchors (7), as well as a system for automatic mooring of vessels (8). In the bow of the platform hull deck there is a superstructure (9), which can accommodate a control room and amenity rooms for the crew, and on both sides of the deck there are rails on which an automatic loading / unloading crane system is installed, consisting of at least two gantry cranes (10) with dynamic stabilization. A helipad (11) with a helicopter take-off / landing control station (12) can be mounted in the aft part of the upper deck of the platform.

In order to ensure the fastening of the semi-submersible platform (1) on the gravity foundation (2), docking nodes (13) are installed in the lower part of the platform body (1).

In order to ensure maneuvering during the installation of the platform (1) on the gravity foundation (2) or, if necessary, to perform other tasks, the movement of the semi-submersible platform (1) is carried out using four rotary rowing electric motors (14) located side by side in the fore and aft parts of the platform ( 1) on cross-links (6).

After the platform (1) has been installed on the gravity foundation (2), it can be connected to the onshore gas pipeline using a gas intake pipe (15).

The towed gravity base (2) (Figs. 5 and 6) is a reinforced concrete structure consisting of a hollow base (16) and hollow columns (17), and which is equipped with docking nodes (18) intended for installation on a gravity base (2) semi-submersible platform (1).

In addition, a gas pipeline (19) can be attached to one of the hollow columns (17) for connecting to an onshore gas pipeline. In the center of the hollow base (16), a linear compressor station (20) with a sealed steel casing can also be installed, which is designed to compensate for pressure losses in the main gas pipeline.

The claimed semi-submersible multipurpose marine complex operates as follows.

The semi-submersible platform can be positioned both by installing it on a gravity foundation, and autonomously, using an anchor holding system.

If a semi-submersible platform is installed on a gravity foundation, the seabed surface is preliminarily prepared. After preparing the seabed, the gravity foundation (2) is towed to the installation point, after which its hollow reinforced concrete structures: the base (16) and columns (17) are filled with water and the gravity foundation (2) is lowered to the seabed.

After the installation of the gravity foundation (2), the semi-submersible platform (1) with pontoons (5) not filled with water is towed to the installation point, while the maneuvering of the semi-submersible platform (1) in order to accurately position it is carried out using rowing motors (14). After the final positioning of the semi-submersible platform (1), its pontoons (5) are filled with water, the semi-submersible platform (1) is lowered and fixed on the docking nodes (18) of the gravity foundation (2).

It is also possible to independently install a semi-submersible platform (1) using gravity anchors (7) of the anchor holding system.

The declared semi-submersible multipurpose marine complex can be in demand in the water area of the Northern Sea Route, while it can be used for various purposes, for example, as:

- roadstead berth for large-tonnage vessels;

- platform-unloader of containers from sea container ships to feeder low-tonnage vessels on unequipped coasts;

- floating workshops for ship repair;

- floating heliports for helicopter basing;

- linear compressor stations for a gas pipeline.

Claims (4)

1. Semi-submersible multi-purpose marine complex containing a floating semi-submersible platform, consisting of a hull and pontoons, rigidly interconnected by means of support columns, equipped with an anchor retention system, characterized in that the complex also includes a towed gravity foundation, which is a reinforced concrete structure, consisting of a hollow base and hollow columns, equipped with docking nodes designed to anchor a semi-submersible platform on the gravity foundation, while the semi-submersible platform can be fixed in place of its installation both by fixing it on the gravity foundation, and autonomously using an anchor retention system. 2. Semi-submersible multipurpose marine complex according to claim 1, characterized in that there is a hold in the body of the semi-submersible platform designed to accommodate sea containers and other cargo. 3. Semi-submersible multipurpose marine complex according to claim 1, characterized in that rails are mounted on the deck of the upper hull, on which a crane system is installed, which serves for automatic loading / unloading of containers, and consisting of at least two gantry cranes equipped with a dynamic stabilization system when working in rough seas. 4. The semi-submersible multipurpose marine complex according to claim 1, characterized in that the semi-submersible platform is equipped with a system for automatic mooring of vessels, including in rough sea conditions.

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