JPS6363686B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention is an improvement of a bottom-mounted rig used in applications such as oil drilling, and the present invention is an improvement of a bottom-mounted rig used in applications such as oil drilling. The present invention relates to a depth increasing device that can be used to increase the depth of water.

[Prior art]

There are various types of rigs currently used for oil drilling in ice-cold waters, one of which is a bottom-mounted rig.

This bottom-mounted rig consists of a pedestal with a skirt that digs into the seabed on the lower surface, a slope part extending above the pedestal for breaking ice sheets, and a column part extending above the slope part. It consists of a platform provided at the upper end of this column, and oil drilling equipment etc. installed on this platform.

The operating depth of this bottom-mounted rig is generally 9m.
The depth is approximately 21m, and oil drilling is being carried out in relatively shallow areas.

Oil drilling in icy waters is first carried out in shallow waters, and in the near future oil drilling will gradually be carried out in deeper waters, for example, at depths of 45 m to 75 m.

Bottom-mounted rigs are designed to have a size commensurate with the operating depth of the sea area in which they will be used. Therefore, as the water gets deeper, another bottom-mounted rig that matches the water depth is designed. You need to prepare.

On the other hand, if a bottom-mounted rig used in shallow water is enlarged without changing its structure, the dimensions of the lower foundation structure, slopes, and pillars will increase as the water depth increases, resulting in an extremely large structure. becomes. This large structure naturally increases manufacturing costs, and it is difficult to provide such large structure with sufficient strength to withstand ice forces.

For this reason, it is desired to develop a bottom-mounted rig that can be used in deeper water than shallow water, has sufficient strength to withstand ice forces, and can be manufactured at a low cost. Ta.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a bottom-mounted rig that can be used in deep water using existing bottom-mounted rigs that have been used in shallow water depths.

[Summary of the invention]

The present invention for achieving the above object consists of a combination of a bottom-reaching rig and a depth-enhancing pedestal, and this depth-enhancing pedestal is provided with a means for landing on the seabed and preventing movement, and the bottom-reaching rig is provided with a means for preventing the bottom from moving. A support surface that can support the bottom surface of the type rig, and a member that guides the bottom-type rig are provided on the side of this support surface, and this deepening pedestal is configured to be able to sink by ballast supply and drainage. This is a depth-enhancing device for bottom-mounted rigs.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

As shown in FIGS. 1 and 2, a depth-enhancing device 1 according to the present invention is composed of a shallow-water bottom-mounted rig 2 and a depth-enhancing pedestal 3.

The bottom-mounted rig 2 includes a base 4 having a skirt 5 on the lower surface, a slope 6 formed above the base, a column 7 extending above the slope 6, and fixed to the upper end of the column 7. The oil drilling equipment 9 is comprised of a platform 8 and oil drilling equipment 9 mounted on the platform 8.

On the other hand, the deepening pedestal 3 is configured as a metal plate or concrete caisson with a support surface that matches the planar shape of the bottom-mounted rig 2, and a support surface 11 is provided on the upper surface of the main body 10, A guide surface 12 composed of an inclined surface is formed around the support surface 11, and a framework 11 is provided inside the main body 10.

An example of this frame 13 is shown in FIG. 2, and the interior partitioned by this frame 13 constitutes a ballast tank 14, and the seawater in the ballast tank 14 can be drained by operating a pump 15. It is composed of

A skirt 1 is provided on the lower surface of the main body 10 to prevent movement of the depth-enhancing pedestal 3 installed on the seabed 16.
7 is provided.

This skirt 17 is similar to the one provided on the bottom surface of the base 3 of the bottom-mounted rig 1, and has a width of 50 cm.
It is made of metal plates of about 100 yen in a concentric, radial, or grid pattern, or a combination of these patterns, and has the effect of digging into the seabed 16 in order to sufficiently withstand the ice force acting on the bottom-mounted rig 2. do.

An inclined guide surface 12 is formed around the upper surface of the main body 10, and a support surface 11 is formed continuously to the guide surface 12, forming a tray-like shape as a whole, and an intermediate member 18 is disposed on the support surface 11. It is laid down.
This intermediate member 18 is for protecting the skirt 5 provided on the lower surface of the base 4 of the bottom-type rig 2 and for integrating the bottom-type rig 2 and the depth-enhancing base 3. It is preferable to use

A pump 15 provided in the deepening pedestal 3 is connected to a ballast seawater supply and drainage pipe 20 and a control wire 21, and a buoy 22 is connected to the tips of the supply and drainage pipe 20 and control wire 21.

Furthermore, a metal fitting 23 is provided on the shoulder of the depth-enhancing pedestal 3, and the metal fitting 23 and the bottom-mounted rig 2 are connected by a wire 24, and the wire 24 is wound up with a winch 25. It's summery.

A tubular portion 26 is provided at the center of the depth-enhancing pedestal 3, and the upper end of these protrudes to prevent the intermediate member 18 placed on the support surface 11 from flowing into the tubular portion 26. Guide members 2 for various pipes that are lowered from the oil drilling equipment 9 of the rig 2 to the seabed 16
7 fits into the inside thereof, and is formed in such a size that it can be continued to the seabed 16.

When using the deepening device 1 configured as described above, it is towed with the deepening pedestal 3 floating to an oil drilling site at a predetermined operating water depth L, and the ballast seawater supply and drainage connected to the buoy 22 is towed. A pipe 20 and a control wire 21 are connected to a work boat, and ballast seawater is supplied into a ballast tank 14 and allowed to settle while adjusting buoyancy.

In addition, as shown in FIG. 2, the ballast tank 14
A valve 30 is provided on the wall of the ballast tank 14 and is opened and closed to supply ballast seawater into a predetermined ballast tank 14.

Then, the existing or newly installed shallow sea bottom-mounted rig 2 is positioned on the depth-enhancing pedestal 3, and the wire 24 is
The position of the bottom-fixing rig 2 is adjusted by the winch 25, the ballast of the bottom-fixing rig 2 is adjusted by the pump 15, and the bottom-fixing rig 2 is installed on the depth-enhancing pedestal 3.

In this case, since the intermediate member 18, which is a buffer material such as sand, is laid above the depth-enhancing pedestal 3, the skirt 5 of the bottom-mounted rig 2 will be placed on top of this. Breaking of the skirt 5 can be prevented.

〔Effect of the invention〕

The present invention installs a deepening pedestal 3 on the seabed 16,
The deepening pedestal 3 has a support surface 11 and a support surface 11.
Inclined surface 1 for guiding the bottom-mounted rig 2 on the side of the
The depth-enhancing base 3 itself is constructed as a caisson, and the depth-enhancing base 3 is configured to sink or float by supplying and draining water to a balat tank 14 provided therein. The structure is characterized in that the bottom-mounted rig 2 is placed on the depth-enhancing pedestal 3.

As a result of the above-described configuration, the present invention can produce the following effects.

As shown in FIG. 1, when drilling for oil in a sea area with an operating depth of L using a shallow-water bottom-mounted rig 2 with an operating depth of l, the deepening pedestal 3 according to the present invention is installed at a working depth of L. Installed on the seabed 16, supporting surface 1 of this
By mounting the bottom-type rig 2 on the bottom-type rig 2, the bottom-type rig 2 is raised by the depth-enhancing pedestal 2, and the bottom-type rig 2 at the operating water depth l is placed at the position at the operating water depth L. Able to perform work.

Therefore, the bottom-type rig 2 for shallow water depth can be used as a bottom-type rig for deep water depth.
This has an important meaning; there is no need to give special strength or structure to the bottom-mounted rig 2, and it is possible to use a rig that can be operated at shallow depths and has sufficient know-how to operate at deep water depths. It can be used as a bottom-mounted rig 2.

As described above, according to the present invention, one bottom-fixing rig can be used at a plurality of working depths, so that the bottom-fixing rig can be used effectively.

Further, since the depth-enhancing pedestal 3 does not come into contact with the ice plate, any structure that can support the bottom-mounted rig 2 is sufficient, and it can be manufactured at low cost. For example, the depth-enhancing pedestal 3 includes a lower structure that touches the bottom of the seabed 16, an upper structure that supports the bottom-mounted rig 2, and a palanquin-like structure in which these structures are connected by pillars, and a metal plate is used. Save materials such as
It can also reduce resistance when moving.

Furthermore, by providing a tank within this deepening pedestal 3, excavated oil can be stored.

[Brief explanation of drawings]

The figures show an embodiment of the present invention, in which Fig. 1 is an explanatory diagram showing a state in which a bottom-mounted rig and a depth-enhancing pedestal are joined, and Fig. 2 shows the internal structure of the depth-enhancing pedestal. FIG. DESCRIPTION OF SYMBOLS 1... Deepening device, 2... Bottom-mounted rig, 3... Deepening pedestal, 10... Main body, 11... Support surface, 12...
... Inclined surface (guiding member), 13 ... Frame, 14 ...
Ballast tank, 15... pump, 17... skirt, 18... intermediate member, 26... tubular part.

Claims (1)

[Claims] 1 Consists of a combination of a bottom-mounted rig and a depth-enhancing pedestal,
This depth-enhancing pedestal is provided with means for landing on the seabed and preventing movement, and has a support surface capable of supporting the bottom surface of the bottom-type rig on the upper surface, and a support surface capable of supporting the bottom surface of the bottom-type rig on the upper surface, and a support surface that can support the bottom surface of the bottom-type rig on the upper surface, and 1. A depth increasing device for a bottom-type rig, characterized in that a member for guiding the rig is provided, and the depth increasing pedestal is configured to be able to be lowered by a ballast water supply and drainage device.