Device and method for transporting and installing the deck of an offshore drilling platform at sea reference base

 

(57) Abstract:

The invention relates to the construction of offshore drilling platforms, which reflects the apparatus and method of transporting and installing the deck of an offshore drilling platform at sea reference base. Semi-submersible vessel with two or several submersible divided into compartments of the pontoons has a form that would require a cut or an open area, which cover a support base on which it is planned to place the deck of an offshore drilling platform. The vessel has a means of ballasting, which consist of separate sealed compartments in the pontoons, and control means to selectively regulate the flow of water coming into sealed compartments. The deck of an offshore drilling platform is transported in an elevated position on the semi-submersible vessel and closes the specified open area so that immediately after proper placement of the semi-submersible vessel (i.e., a raised platform mounted above a support base being aligned with him), semi-submersible vessel quickly ballustrade, inducing thus a platform on the supporting base. The invention provides a set is avridine deck. 2 C. and 10 C.p. f-crystals, 6 ill.

The invention relates to the construction of offshore drilling platforms in General, and in particular to a method for installation on a supporting base deck of an offshore drilling platform without the use of large-capacity crane.

It is well known that it is much easier and cheaper to assemble large marine structures on the land with their subsequent towing to the place of installation later than to build these structures in the sea. In this regard, every effort is made to reduce the amount of work performed in the sea, which may be required in order to minimize the cost of construction. However, regardless of these efforts, in each case, there is a need to perform a certain amount of work in the sea.

In the past, when large offshore drilling platform was required to install the deck, it is often found desirable to make the deck in the form of a single large block and install it fully assembled, picking up towed barges and placing on a support base. Unfortunately, increasing the size and weight of the decks are becoming less of heavy lift cranes, capable of lifting such a load. In lucazade put into place individually. This led to the tightening of the Assembly process, since it is now required some climbs, and after installation it was necessary to connect and test a variety of equipment based on individual modules, thus causing an increase in the volume of work performed in the sea.

By the way, an alternative to dividing the deck into modules, is the manufacturer of the deck completely on the shore and the subsequent lowering of this deck large size on a relatively narrow barge. Then the barge should be delivered to the installation site where it has to maneuver between the established support columns (what is the need to narrow the barge and wide gaps between the defined support columns). Once in place, the barge must be selectively ballotirovatsya, sinking deeper into the water and thus allowing the deck to descend to the specified set of supporting columns. Then the barge can be withdrawn from under the deck and deballasting. Unfortunately, this method requires the support base special design with a large open space in its Central part at the level of the water surface, in order to be able to take the barge. This is typically only de. In addition, this method requires that the barge is of sufficient width to provide stability to the vehicle rolling, when the deck rests on the barge. However, to achieve such stability requires a wide barge, causing the need for a larger space in the center of the design, which should be placed the deck, which in turn requires an increase in the length of the flight deck between the support columns. Thus, decreases the efficiency of the design as a deck and substructure, resulting in this method is practically applicable only for a very wide decks and substructures with lower deck load on them.

The closest analogue of the invention is a device and method for transporting and installing the deck of an offshore drilling platform at sea reference base [1].

The known device for the transportation and installation of the deck of an offshore drilling platform at sea reference base contains a semi-submersible vessel with two or several submersible divided into compartments of the pontoons supporting the deck raised above the water level, set on the deck of a ship guiding devices, e selected position and ballasting means for lowering the vessel and over the deck of an offshore drilling platform on the supporting base of an offshore drilling platform.

There is a method of transporting and installing the deck of an offshore drilling platform at sea reference base includes a loading deck of an offshore drilling platform semi-submersible vessel having two or more submersible pontoon, divided into compartments, supporting the deck raised above the water level, transporting the vessel to a sea anchor base installation and alignment of the deck of an offshore drilling platform above the support base and ballasting the vessel to restore the deck of an offshore drilling platform on the supporting base.

When using the known device and method having difficulty with the ballasting of the vessel before pointing the deck on the supporting base. They are related to the fact that the ballasting of the vessel should be carried out quite quickly, almost immediately, at a time when the deck is properly aligned relative to the support base. Any sudden rising wave or gust of wind can break the alignment or misalignment of the vessel may cause damage to the deck.

The technical result of the invention is the ability to set the deck on a variety of base, removing the need for the Oia deck.

It is achieved by the fact that in the known device for the transportation and installation of the deck of an offshore drilling platform at sea reference base ballasting means consist of a separate watertight compartments in the pontoons filled with water, and control means to selectively regulate the flow of water coming into sealed compartments, and in each sealed compartment formed channel with the receiving valve and the entrance at the bottom of the pontoon to pass through a sea of water, and the deck has an outdoor area, covered deck of an offshore drilling platform, with dimensions, allowing to partially cover the support base.

In addition, it includes a means of increasing pressure placed on the vessel and designed to increase the pressure in the separate compartments.

In addition, management tools include pneumatic exhaust valves to decrease the pressure in the compartments, in which, after lowering the pressure of the supplied water, thus providing ballasting of the vessel.

In addition, includes the bumper, located on the perimeter of an open area for contact with the support base and the alignment of the vessel relative to the supports the project for the substructure.

Also includes shock absorbing means disposed between the deck of an offshore drilling platform and support base designed for shock absorption deck of the drilling platform on the supporting base when it is over.

In addition, fastening means include means mooring, located on the ship and designed for proper installation of the vessel relative to the substructure.

In addition, the open area in the deck of the vessel is U-shaped.

In addition, the open area is located in the aft part of the ship.

The technical result is achieved because the known method of transporting and installing the deck of an offshore drilling platform at sea reference base deck of an offshore drilling platform is installed with an overlap of open land in the deck of a ship, having dimensions allowing to partially cover the support base, and the ballasting of the vessel is carried out by first increasing the pressure in the separate compartments of the pontoons through the pressure boosting system, located on the ship, selective decompression for flooding these compartments and selective regulation of the flow of water in Kadina.

In addition, between the deck of an offshore drilling platform and support base install cushioning system for shock absorption when you hover the deck of an offshore drilling platform on the supporting base.

In addition, it includes mooring of a vessel in a pre-selected position through a system of moorings attached to the vessel.

The invention is illustrated by drawings.

In Fig. 1 shows the image from above, partially in section, of the deck before loading on the adjacent semi-submersible vessel.

In Fig. 2 shows the image in the incision made along the line 2-2 of Fig. 1, illustrating the ground support mechanism deck before loading on semi-submersible vessel.

In Fig. 3 shows a side view, partially in section, of the deck before loading on semi-submersible vessel.

In Fig. 4 shows the image at the top of the semi-submersible vessel and its deck in the moment of approaching the support base, located in the sea.

In Fig. 5 shows the image at the top, with the removed for clarity deck, semi-submersible vessel that is located properly relative to the substructure.

In Fig. 6 shows a view in section, vypolnennymi, located on the semi-submersible vessel.

In Fig. 8 shows a view in section, similar to the one shown in Fig. 6, but after pointing deck at the base.

Refer first to Fig. 1 to 3 showing the open area of the semi-submersible vessel 10 and the deck 12 of an offshore drilling platform, which must be loaded on the vessel 10 and delivered to the construction site into the sea.

The vessel 10 is typically a semi-submersible vessel having a lot of underwater pontoons 14, which are based on vertical columns 16 and the deck 18. The pontoons 14 are selectively filled with ballast (for example water) so that the deck 18 of the vessel 10 can be aligned with the wall 10. Thus, the deck 12 may be loaded onto the vessel 10 for further transport. Due to the size of the pontoons 14 and columns 16 semi-submersible vessel 10 is less susceptible to the sway and yaw than conventional barge. In addition, the pontoons 14 provide a high degree of stability, since they are less exposed to wind and waves.

Initially, the deck 12 is constructed on land on the elevated ramps 22, located near the wall 20. At these elevated ramps 22 are based special is about, due to the elevation of the deck 12 located on the opposite ends of the transport farm 28 is also raised above the wall 20. In addition, the guides 30 on the deck 18 of the vessel 10 are flush with the ground transport farm 28. Thus, when moving or loading deck 12 in the vessel 10, for example, not shown in the drawing by means of the transport farm fall into the rails 30 and to provide support for the deck 12 in the vessel 10.

In essence, the weight of the deck 12 is transmitted from the stocks 22 located on land, on the guides 30, located on the ship 10. Transport farm guides 28 and 30 evenly distribute the weight of the deck 12 of the vessel 10 so that the vessel 10 can be made seaworthy (i.e., will not have too much pitch at the keel rolling or tilting). In addition, the guide 30 supports the deck 12 at the height that is needed to combine with sea support base 32.

In Fig. 4 and 5, the vessel 10 is shown as approaching at sea reference base 32, and partially covering the support base 32. As can be seen in these drawings, the deck 18 of the vessel 10 has an open area 36, the dimensions of which allow you to cover the support base 32. The pebo to imagine mooring to the wall 20 during loading operations carried out by the stern 38 of the vessel 10.

When the vessel 10 is approaching the base 32, mooring lines 40 extend from winches 42 on the vessel 10 to the predefined springhaven buoy 44. These mooring lines 40 and winch 42 allow you to align the vessel 10 relative to the base 32, and help to keep the vessel 10 in place. Mooring not allow the vessel 10 to disconnect and possibly damage the base 32.

As best seen in Fig. 5, the vessel 10 is constructed with a baffle 46 around the perimeter of the open area 36. Bumpers 46 also provides the necessary alignment of the vessel 10 relative to the support base 32 before pointing the deck 12 on the supporting base 32. In practice, the deck 12 is located on the vessel 10 in a preset position relative to the striker 46, so that when the bumper 46 is in contact with the support base 32, the deck 12 is aligned relative to the support base 32. It is shown in Fig. 5 bumpers 46 has a V-shaped open section 48, but equally, other configurations are possible, such as multilateral outdoor area, resembling part of the octagon, hexagon, Pentagon, or the like.

After you determine that the vessel 10 and the deck 12 are properly driven ballasting system 50 (Fig. 7) to quickly fill up with water, the pontoons 14 of the vessel 10. Typically, each of the pontoons 14 there is more than one system ballasting 50, and each pontoon 14 is also divided into compartments so that different compartments (or different pontoons 14) can be filled to varying degrees, depending on the load on the ship 10. This helps to ensure the stability of the vessel 10 during transportation and unloading and to maintain the orientation of the deck level 18.

As shown in Fig. 7, the ballasting system 50 includes a suction valve 52 in the channel 54, located in the inlet chamber 56. The channel 54 includes an inlet 58 in the lower portion of the pontoon 14 to pass through a sea of water and the release of 60 opening into the compartment 62. Usually the intake valve 52 is in the closed position, but, if necessary, opens.

Before applying the ballasting system 50 and after installation of the vessel 10 in place of the air surrounding the spring tube 64, thereby increasing the pressure in the compartment 62, while the pneumatic exhaust valve 66 on the vent pipe 68 remains closed. When the pressure in the compartment 62 and the pressure of the sea water inlet 58 are aligned, the intake valve 52 is opened, while the pneumatic exhaust valve 66 remains closed. Because of this alignment sea water is not supplied through the channel 54 or suction valve 52 into the compartment 62 and thus the vessel 10 remains stationary.

However, once a decision will be made about the ballasting of the vessel 10 so as to bring the deck 12 on the supporting base 32, a pneumatic discharge valve 66 (in compartment 62 may be more than one such valve 66) just opens that allows you to release the compressed air from the compartment 62 through the blowing pipe 68 and let sea water through the inlet 58. Thus, there is a rapid ballasting, causing rapid immersion vessel 10 that allows you to slide the deck 12 on the supporting base and leave it. This rapid ballasting will continue up until the pneumatic exhaust valve 66 is closed and the pressure is again equalized.

In Fig. 8 shows the vessel 10 after ballasting and after deck 12 nadwi the Finance 32, while transport farm 28 no longer relies on the Cam 30 on the vessel 10. After the vessel 10 in place against the support base 32, a support 26 and a shock-absorbing device 34 more firmly connected with the base 32, finally fixing, thus, the deck 12 in place. After removal of the vessel 10, it can be deballasting by closing the pneumatic exhaust valve 66 and a purge compartment 62 by compressed air through tubing 64. This will allow you to push the water through the suction valve 52 and through the inlet 58. Then, when you have reached the desired degree of buoyancy, the intake valve 52 is closed so that the compartment 62 can no longer enter the sea water.

In addition, after the deck 12 is no longer used and should be removed, the operation can be performed in reverse order to remove the deck 12 with the support base 32 for subsequent removal.

One of the advantages of the vessel 10 is its large width, providing resistance or resistance to swinging under the influence of waves or wind even with heavy loads. In addition, since the vessel 10 is a semi-submersible vessel, it is less exposed to the forces of waves or wind. system is faster than in the case of the use of the transport barge or floating crane. In addition, during such operation speed ballasting can quickly be controlled by regulating the pneumatic exhaust valves 66, depending on the prevailing conditions. This is important in order to avoid damage to the deck 12, caused by the lifting of the vessel 10. In addition, high speed ballasting reduces the time required for ballasting, reducing, thus, the "window of favorable weather, necessary for operations, compared to the previously required.

1. Device for transporting and installing the deck of an offshore drilling platform at sea reference base containing a semi-submersible vessel with two or more submersible divided into compartments of the pontoons supporting the deck raised above the water level, set on the deck of a ship guiding devices that support the deck of an offshore drilling platform, a fastening system for securing and holding the vessel at a pre-selected position and ballasting means for lowering the vessel and over the deck of an offshore drilling platform on the supporting base of an offshore drilling platform, otlichayushiesya control to selectively regulate the flow of water, coming into sealed compartments, and in each sealed compartment formed channel with the receiving valve and the entrance at the bottom of the pontoon to pass through a sea of water, and the deck has an outdoor area, covered deck of an offshore drilling platform, with dimensions, allowing to partially cover the support base.

2. The device under item 1, characterized in that it includes means to increase the pressure placed on the vessel and designed to increase the pressure in the separate compartments.

3. The device under item 1, characterized in that the control means include pneumatic exhaust valves to decrease the pressure in the compartments, in which, after lowering the pressure of the supplied water, thus providing ballasting of the vessel.

4. The device under item 1, characterized in that it includes the bumper, located on the perimeter of an open area for contact with the support base and the alignment of the vessel relative to the substructure.

5. The device according to p. 4, characterized in that the bump stop is designed and placed partially embracing the substructure.

6. The device under item 1, characterized in that it includes amortiz the e for shock absorption deck of the drilling platform on the supporting base when it is over.

7. The device under item 1, characterized in that the fastening means include means mooring, located on the ship and designed for proper installation of the vessel relative to the substructure.

8. The device under item 1, characterized in that the open area in the deck of the vessel is U-shaped.

9. The device according to PP.1 and 8, characterized in that the open area is located in the aft part of the ship.

10. Method for transporting and installing the deck of an offshore drilling platform at sea reference base, including the loading deck of an offshore drilling platform semi-submersible vessel having two or more submersible pontoon, divided into compartments, supporting the deck raised above the water level, transporting the vessel to a sea anchor base installation and alignment of the deck of an offshore drilling platform above the support base and ballasting the vessel to restore the deck of an offshore drilling platform on the supporting base, wherein the deck of an offshore drilling platform is installed with an overlap of open land in the deck of the vessel, having allowing to partially cover the support base, and the ballasting of the vessel osushestvlya, located on the vessel, selective decompression for flooding these compartments and selective regulation of the flow of water in each of these compartments via formed in each channel with the receiving valve and the inlet at the bottom of the pontoon.

11. The method according to p. 10, characterized in that between the deck of an offshore drilling platform and support base install cushioning system for shock absorption when you hover the deck of an offshore drilling platform on the supporting base.

12. The method according to p. 10, characterized in that it includes mooring of a vessel in a pre-selected position through a system of moorings attached to the vessel.

 

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FIELD: shipbuilding; manufacture of mobile research complexes.

SUBSTANCE: proposed complex is made in form of ship with small waterplane area having upper and lower hulls interconnected by means of telescopic columns for disconnection and autonomous motion of these hulls. Lower hull is submersible vehicle and upper hull is amphibian. Both hulls are provided with greenhouses and power units for generation of energy for motion of complex, domestic and technological purposes, as well as for growing vegetables, sea products and production of distilling water by motion of spheres with plant containers located spirally on their surfaces, thus ensuring generation of electric power. In addition to vegetation tubes with plants growing chains are provided where sea products are contained for distilling sea water by change in pressure and level of illumination and growing chains for growing fish and preparation of nutrient solution for plants. Lower hull is provided with plankton trawls for delivery of plankton for greenhouse and power plants of lower and upper hulls for growing fish and sea products. Amphibian supplies fresh air to submersible vehicle through its collector; it is also used for transportation of sections for erection of scientific research station. Provision is made for delivery of light to submersible vehicle through lenses, light conduits and structural sections and light conduits of collector of vehicle.

EFFECT: environment control.

4 cl, 22 dwg

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