KR20150078904A - Drillship having a downwardly disposed weight - Google Patents

Abstract

Disclosed is a drillship having a downward-placed heavy object. According to the present invention, a drillship having a downward-placed heavy object includes a mud pump pumping mud into the seafloor; and an active mud tank storing the mud and used for drilling work. As the vertical center of gravity for a vessel is lowered by preparing the mud pump and the active mud tank in a lower area, a hold ballast tank, prepared at the stern of the vessel, is removed, and the longitudinal center of gravity for the vessel is moved towards the stern.

Description

DRILLSHIP HAVING A DOWNWARDLY DISPOSED WEIGHT BACKGROUND OF THE INVENTION [0001]

The present invention relates to a drill ship, and more particularly, to a drill ship having a weight center including a mud pump and an active mud tank disposed at a lower portion of a main deck to reduce the center of gravity of the ship.

With the rapid development of international industrialization and industry, the use of earth resources such as oil is gradually increasing, and thus the stable production and supply of crude oil is becoming an increasingly important issue globally.

For this reason, recently marginal field or deep-sea oil development has been economically feasible, which has been neglected due to economic difficulties so far. Therefore, with the development of submarine mining technology, drilling facilities suitable for the development of such oilfields A drilling rig equipped with a hull has been developed.

Conventional submarine drilling has been mainly used for a rig ship or a fixed platform for underwater drilling which can be sailed only by other tugboats and which is used for drilling underwater at anchor point on the sea using a mooring device.

In recent years, however, drill ships and FPSO (Floating, Production, Storage and Offloading), which are manufactured in the same form as ordinary ships, have been developed to mount advanced drilling equipment and to navigate with their own power. Has been used for subsea drilling and production.

In order to develop small-scale oilfields, drilling rigs are designed to be able to navigate powerlessly without a tugboat, depending on the working conditions that need to be moved frequently.

FIG. 1 is a schematic view showing a starboard side view of a conventional drill ship, and FIG. 2 is a plan view schematically showing the drill ship shown in FIG.

As shown in FIG. 1, the main section deck MD is provided with a mud module, and a mud supply related equipment such as a high pressure mud pump and an active mud tank is installed in the inside of the mud module. Lt; / RTI >

Since the drill pipe used for drilling is provided on the inside of the mud module, a mud pump, an active mud tank, a cement unit or the like having the above-mentioned high load is provided therein, and the higher the height of the mud module, center of gravity, that is, the vertical center of gravity.

As a result, when the ship is tilted sideways by the external force, the stability of the ship, which is the property of returning to the original state, is also degraded, which may adversely affect the stability of the drill ship. The stability is good and the drill ship can not be overturned even in severe winds and waves.

The main deck is provided with a drill floor provided at a place where drilling is performed, and a high load derrick, a traveling block, a heave compensator, and the like are installed on the drill floor .

Conventionally, since the location of the portal center is located in the direction of the fork ahead of the center of the drill ship, the center of gravity of the derrick, which is the main load of the drill ship, is located at the bow.

Therefore, since the longitudinal center of gravity of the drill ship is offset in the forward direction, the transit condition causes the wave resistance (when the ship is running, a regular wave occurs at the ship's tail, The required energy loss of the ship is a kind of resistance, which is referred to as a wave resistance), which results in a deterioration of the moving performance and a disadvantage in stability and dynamic position at the time of drilling.

In order to solve the problem caused by the wave resistance, it is necessary to adjust the ballasting of the aft part to adjust the trim so that a separate hold ballast tank should be provided at the stern part, which leads to an increase in the capacity of the ballast tank.

Meanwhile, conventionally, the space between the hold ballast tank and the platform is left as a void space as shown in FIG. 2, resulting in less space utilization. As described above, as the center of gravity of the hull becomes higher, the restoration and mobility are lowered. Therefore, an improvement measure for lowering the center of gravity of the hull by utilizing the hollow space is required.

In addition, conventionally, the arrangement of the tanks provided between the platform and bow is not efficient.

Specifically, a drill water tank, a brine tank, a base oil tank, a mud storage tank, a drain tank room, and a bulk storage tank room were provided in order from the floor. Among them, the bulk storage tanks in the mud storage tanks and the bulk storage tank rooms are related to each other with the mud system related equipment.

However, the brine tank filled in the drilled well after the drilling operation is completed, the base oil tank supplied to the well during the drilling operation, the oil, the mud, the wastewater and the like introduced from the drill floor and the main deck are stored, The drain tanks in the tank room are not relevant to each other.

Therefore, there is also a need for a remedy for the efficient arrangement of the aforementioned tanks.

Korean Patent Publication No. 2010-0060349 (Samsung Heavy Industries Co., Ltd.) 2010.06.07.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above problems, and it is an object of the present invention to provide a hull structure capable of improving the stability and mobility by lowering the center of gravity of the hull and removing a structure unnecessary for improvement of mobility, It is to provide a drill ship.

According to one aspect of the present invention, there is provided a mud pump for pumping a mud to a seabed; And an active mud tank in which a mud used for drilling is stored. The mud pump and the active mud tank are provided in a lower area of the main deck to lower the vertical center of gravity of the ship, Wherein the hold ballast tank is removed, and a longitudinal center of gravity of the hull is moved in the direction of the stern.

The door frame and the derrick provided on the drill floor can be moved in the direction of the stern portion to move the longitudinal center of the hull to the stern portion.

And a mud pump room provided between the moon pool and the mud storage tank disposed in the bow portion, wherein the mud pump and the active mud tank may be provided in the mud pump room.

One side of the mud pump room may be in contact with the door frame, and the other side of the mud pump room may be in contact with the mud storage tank.

And a bulk storage tank room disposed between the mud storage tank and the forefront portion, wherein one side of the bulk storage tank is in contact with the mud storage tank.

And a switchboard room disposed between the bulk storage tank room and the forefront and having one side thereof in contact with the bulk storage tank room.

And a drill water tank provided in a void space in the width direction of the area around the drum.

And a drain tank room provided in the hold ballast tank area.

And a brine tank and a base oil tank provided between the drain tank room and the door frame.

According to another aspect of the present invention, there is provided a drill ship including a mud pump and an active mud tank, wherein the mud pump and the active mud tank are provided below the main deck to lower the vertical center of the ship, Wherein the hold ballast tanks are removed, and the hold ballast tanks are removed to move the platform and derrick in the stern space direction, thereby lowering the longitudinal center of the hull.

Embodiments of the present invention include a mud pump and an active mud tank at the bottom of the main deck to lower the vertical center of the hull and move the longitudinal center of the hull to the stern to lower the center of gravity of the hull to improve stability and mobility .

In addition, the tank can be efficiently disposed by securing a space by eliminating the hold ballast tank which is unnecessary due to the improvement of mobility.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a schematic view showing a starboard side view of a conventional drill ship. FIG.
Fig. 2 is a plan view schematically showing the drill ship shown in Fig. 1. Fig.
FIG. 3 is a side view schematically illustrating the starboard of a drill ship with a heavy object disposed in a downward direction according to an embodiment of the present invention.
Fig. 4 is a plan view of Fig. 3. Fig.
Fig. 5 is a plan view schematically showing a comparison between the tank arrangement of the present embodiment and the conventional drill ship tank arrangement.

In order to fully understand the present invention, operational advantages of the present invention, and objects achieved by the practice of the present invention, reference should be made to the accompanying drawings and the accompanying drawings which illustrate preferred embodiments of the present invention.

Hereinafter, the present invention will be described in detail with reference to the preferred embodiments of the present invention with reference to the accompanying drawings. Like reference symbols in the drawings denote like elements.

FIG. 3 is a side view schematically showing the starboard of a drill ship with a heavy object disposed in a downward direction according to an embodiment of the present invention, FIG. 4 is a plan view of FIG. 3, FIG. 2 is a plan view schematically showing a tank arrangement of a tank.

As shown in these drawings, the drill ship 1 in which the heavy object according to the present embodiment is disposed in a downward direction includes a mud pump 10 for pumping a mud to the sea bed, An active mud tank 20 and a mud pump room 40 provided between the mud storage tank 30 and the mud storage tank 30. The mud storage tank 30 is disposed between the mud storage tank 30 and the fore end, A bulk storage tank room 50 provided in contact with the storage tank 30; a switchboard room 60 disposed between the bulk storage tank room 50 and the fore end and having one side in contact with the bulk storage tank room 50; A drill water tank 70 provided in a void space in the width direction of the area around the mop M, a drain tank room 80 provided in the removed hold ballast tank HB region, The brine tank 90 and the base oil tank 100, which are provided between the drum 80 and the drum M, The.

The present embodiment is characterized in that the heavy load mud pump 10 and the active mud tank 20 are provided in the lower area of the main deck MD to lower the vertical center of gravity of the ship, And it is possible to remove the hold ballast tank HB (see FIG. 2) provided in the conventional aft part.

Since the hold ballast tank HB is removed from the stern part, an additional space can be secured as much as the removed hold ballast tank HB and the space M and the derrick D can be moved toward the stern part The longitudinal center of gravity of the hull can be aligned with the center of the hull, not the bow.

Specifically, in the past, the center of the drapery center was located in the bow direction rather than the center of the drill ship, so that the center of gravity of the derrick (D), which is the main load of the drill ship, was located at the bow.

Therefore, since the longitudinal center of gravity of the drill ship is shifted toward the fore part, the wave resistance increases due to the transit condition during the drill ship movement, resulting in deterioration of the moving performance, poor stability, and a dynamic position dynamic position).

In order to solve the problem caused by the wave resistance, it is necessary to adjust the ballasting of the aft part to adjust the trim so that a separate hold ballast tank (HB) has to be provided at the stern part.

 The present embodiment is characterized in that the mud pump 10 and the active mud tank 20 are disposed in the lower area of the main deck MD and the center of the longitudinal direction is fitted to the center of the hull, To reduce ballast capacity.

In addition, the tank can be efficiently arranged using the space of the removed hold ballast tank HB and the empty space behind the conventional door frame M (see FIG. 2), and the piping can be arranged efficiently as well .

In addition, by providing the mud pump 10 and the active mud tank 20 in a lower area of the main deck MD rather than the mud module 110, the size of the mud module 110 can be reduced, .

The configuration of the present embodiment will be described below.

The mud pump 10 supplies a mud to a drill bit during a drilling operation. In this embodiment, the mud pump 10, unlike the prior art for lowering the vertical center of the hull, Likewise, it is provided in the mud pump room 40 located underneath the main deck MD.

In the present embodiment, for example, four mud pumps 10 may be installed, and each mud pump 10 is a heavy object. Therefore, by providing the mud pump 10 in the mud pump room 40, It can be lowered toward the bottom side.

The active mud tank 20 is the one in which the mud before being pumped by the mud pump 10 is ultimately stored. In this embodiment, the active mud tank 20, unlike the prior art, for lowering the vertical center of the hull, Is provided in the mud pump room 40, as shown in Fig.

In this embodiment, the active mud tanks 20 may be provided in plurality and include an oil active mud tank in which an oil based mud is stored and a water activated mud tank in which a water based mud is stored .

In this embodiment, for example, six oil active mud tanks may be provided, and four water active mud tanks may be provided.

The present embodiment is characterized in that a plurality of active mud tanks 20 are provided in the mud pump room 40 located below the main deck MD rather than on the top of the main deck MD, The vertical center of the hull can be lowered toward the bottom.

4, the mud storage tank 30 is provided between the mud pump room 40 and the bulk storage tank room 50 and the mud storage tank 30 is pumped into the active mud tank 20, The manufactured mud before being stored.

In this embodiment, the mud stored in the mud storage tank 30 is supplied to the active mud tank 20 by a mud transfer pump, and the mud transfer pump supplies the mud stored in the active mud tank 20 to the above- The mud pump 10 of FIG.

The mud pump room 40 is provided between the door M and the mud storage tank 30 as shown in Fig. 4, and the space in which the mud pump room 40 is provided in this embodiment, 5, the hold ballast tank HB can be secured by using the secured space and the void space behind the conventional postal matter M, as shown in FIGS.

The bulk storage tank room 50 is a place where a bulk storage tank in which bentonite, barite or the like serving as a material of the mud is stored in bulk form is provided. In the present embodiment, (50) may be provided so that the mud storage tank (30) and the rear portion are in contact with each other.

This embodiment is characterized in that the mud pump room 40, the mud storage tank 30, and the bulk storage tank room 50, which are provided with the mud pump 10 and the active mud tank 20, It is possible to simplify the piping connecting the tank and the pump, thereby reducing the power required to pump the pump.

Particularly, the liquid and powder stored in the active mud tank 20, the mud storage tank 30 and the bulk storage tank can be viscous or laminated at the bent portion of the pipe, so that the pipe can be clogged. However, this embodiment has an advantage that the phenomenon such as clogging of the piping can be reduced by arranging the tanks related to each other close to each other.

The switchboard room 60 is provided with a device for distributing electric power required for driving a pump, a tank, and the like. In this embodiment, the switchboard room 60 is connected to the mud system related equipment The length of the electric wire or the like can be reduced by disposing it close to the area to be disposed.

The drill water tank 70 may be provided in the width direction area around the door frame M, as shown in Fig. The width direction area around the conventional door frame M is a blank space as shown in Fig. 5 (a).

The present embodiment can increase the space utilization by providing the drill water tank 70 in the empty space around the door M.

Further, since the liquid stored in the drill water tank 70 is fresh water rather than viscous liquid such as mud, there is almost no phenomenon that water is stacked at the bent portion of the pipe to block the pipe, Even if it is placed away from the equipment related to the mud system, there is almost no problem.

The drain tank room 80 is a place where a drain tank for storing drains including oil, sewage, mud, and the like introduced from the main deck MD and the drill floor is provided.

In the present embodiment, the drain tank room 80 may be provided in a space secured by removing the hold ballast tank HB as shown in FIG.

In this embodiment, the drain stored in the drain tank is not used for drilling operation or for filling the well after the drilling operation. Therefore, a drain tank which is not related to the drain tank is disposed in the stern part instead of the other tank.

4, the brine tank 90 is provided between the drain tank room 80 and the mouthpiece M, that is, at the rear port of the mouthpiece M, as shown in Fig. This is because the storage stored in the brine tank 90 differs in function from the other tanks in that the well is filled in the well so that the well remains in a stationary state after the drilling operation is completed.

The base oil tank 100 is provided between the drain tank room 80 and the door frame M, that is, on the rear side of the door frame M, as shown in Fig. The base oil tank 100 is a tank in which oil to be added to the mud is stored so that the mud is lubricated. In this embodiment, the base oil tank 100 is provided in an empty space in the star widthwise direction of the door frame M .

4 and 5, the present embodiment includes a fuel storage tank 120 disposed immediately behind the drain tank room 80 and storing oil containing MGO (Marine Gas Oil) .

The present embodiment can remove the hold ballast tank HB by lowering the center of gravity of the hull as described above and remove a part of the space occupied by the removed hold ballast tank HB, There is an advantage that the capacity of the oil stored in the fuel storage tank 120 can be increased by using it as an extended space of the fuel storage tank 120. [

As described above, according to the present embodiment, the mud pump and the active mud tank are provided at the lower portion of the main deck to lower the vertical center of the hull and move the longitudinal center of the hull to the stern, thereby lowering the center of gravity of the hull, Can be improved.

In addition, by eliminating the hold ballast tanks which are unnecessary due to the improvement of the mobility, the space can be secured, the tank can be efficiently arranged, the size of the mud module can be reduced, and the capacity of the fuel storage tank can be increased.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Accordingly, such modifications or variations are intended to fall within the scope of the appended claims.

1: drill ship with weight downwards 10: mud pump
20: Active mud tank 30: Mud storage tank
40: Mud pump room 50: Bulk storage tank room
60: Switchboard room 70: Drill water tank
80: Drain tank room 90: Brine tank
100: Base oil tank 110: Mud module
120: Fuel storage tank D: Derrick
HB: Hold ballast tank M:
MD: Main deck

Claims (10)

A mud pump for pumping the mud to the seabed; And
An active mud tank in which a mud used for drilling is stored,
The mud pump and the active mud tank are provided in a lower region of the main deck to lower the vertical center of gravity of the ship to remove the hold ballast tank provided at the stern portion,
To move the longitudinal center of gravity of the hull in the direction of the stern. The method according to claim 1,
And the derrick provided on the drill floor is moved in the direction of the stern to move the longitudinal center of the hull to the stern portion. The method according to claim 1,
And a mud pump room provided between the midday pool and the mud storage tank disposed in the bow portion,
Wherein the mud pump and the active mud tank are provided in the mud pump room. The method of claim 3,
Wherein one side of the mud pump room is provided in contact with the door frame and the other side of the mud pump room is in contact with the mud storage tank. The method of claim 4,
And a bulk storage tank room disposed between the mud storage tank and the forefront portion, one side of the bulk storage tank room being in contact with the mud storage tank. The method of claim 5,
Further comprising a switchboard room disposed between the bulk storage tank room and the fore end, wherein one side of the switchboard room is in contact with the bulk storage tank room. The method according to claim 1,
Further comprising a drill water tank provided in a widthwise void space of the area of the perimeter of the mouthpiece. The method according to claim 1,
And a drain tank room provided in the hold ballast tank area removed. The method of claim 8,
Further comprising a brine tank and a base oil tank provided between the drain tank room and the door frame. In a drill ship having a mud pump and an active mud tank,
The mud pump and the active mud tank are provided below the main deck to lower the vertical center of the hull to remove the hold ballast tanks provided at the stern portion and to remove the hold ballast tanks, So as to lower the longitudinal center of the hull.

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