KR20170020991A

KR20170020991A - Structure of moon-pool for drillship

Info

Publication number: KR20170020991A
Application number: KR1020150115194A
Authority: KR
Inventors: 신현일
Original assignee: 대우조선해양 주식회사
Priority date: 2015-08-17
Filing date: 2015-08-17
Publication date: 2017-02-27

Abstract

A moon pool structure for a drill ship is disclosed. The present invention comprises: an upper expansion space enabling a riser provided to a moon pool of a drill ship to be formed in an upper portion of the inside of the moon pool to be moved with relative to the drill ship; and a lower expansion space formed in a lower portion inside the moon pool. The present invention prevents a hull of the drill ship or components provided to the drill ship from interfering or colliding with the rise in an offshore drilling work.

Description

Structure of moon-pool for drillship

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a drill-in door structure, and more particularly, to a drill-hole structure having a space through which a riser provided in a drill-

It is a drilling facility which is a kind of floating floating vessel. It is a vessel type drilling facility designed to drill crude oil or gas buried in the sea floor.

Drilling using a drill ship is accomplished by drilling through the surface of the seabed using a drill pipe. The drill pipe is drilled in a riser provided at the bottom of the drilling tower called Derrick.

This drilling operation takes place in the Moon Pool, which is an empty space formed between the hulls of the drill ship. In other words, the riser will drill through the portal with the pipe to be drilled into the water.

On the other hand, during the drilling operation, the drill ship and the riser floating on the sea due to the marine environment may cause relative motion.

When the relative movement of the riser and the drill ship occurs, when the relative movement is relatively small, the riser moves only inside the drill ship's mouth, so that no problem occurs.

However, when the marine situation is deteriorated due to bad weather and the relative motion of the drill ship and the riser is large, the riser may cause a problem of interfering with or colliding with other structures on the drill ship do. Particularly, such interference or collision can occur with the bottom of the drill ship having the door pool formed therein, and when the trolley for supporting and transporting a BOP (Blow Out Preventor) provided in the drill ship is installed, And the like. Hereinafter, this will be described in more detail with reference to FIG.

1 is a view showing an example of a structure of a drill ship and a door pillar.

Referring to FIG. 1, for example, when the riser 3 moves relative to the drill ship at a turning angle of approximately 8 degrees, the riser 3 is still moving in the door 2, Does not occur. However, for example, when the riser 3 performs a relative movement with the drill ship at a turning angle of approximately 10 degrees, as shown in FIG. 1, the drill ship 5 of the coffer dam 5 formed on the inner wall of the door pool 1) to the bottom. Alternatively, if the drilling operation is being performed with the trolley in the drill ship, the riser may cause interference with the trolley, or even collision, though it is not shown in Fig.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a drill ship type structure capable of preventing a collision or collision with a riser, a structure provided in a drill ship, or a drill ship in a drilling operation at sea.

According to an aspect of the present invention, there is provided a drill ship comprising: a drill hole formed on a hull of a drill ship; A support for supporting the trolley support unit which is provided inside the door frame and supports the trolley installed in the drill ship; A drill-in hole structure is provided.

The support portion may extend to a bottom of ship of the drill ship, and the lower end of the support portion may have a chamfer structure.

The support portion may be formed on an upper portion of the door frame.

The support portion forming a top portion of the support portion and supporting the trolley; And a fixing member forming a lower portion of the support portion and fixing the support member to the drillhose; . &Lt; / RTI >

The supporting member may be a T-BIG, and the fixing member may be a bracket.

The inside of the support part may have a void space.

According to another aspect of the present invention, there is provided a drill ship including: an upper enlarged space formed in an upper portion of a door of a drill ship so that a riser provided on the door can relatively move relative to a drill ship; And a lower enlarged space formed in a lower portion of the door frame; A drill-in hole structure is provided.

According to the present invention, since the riser provided in the inside of the drum during the drilling operation using the drill-hole can have a drill-through and a relatively movable space in the drum, the drill- .

Also, according to the present invention, the amount of the material used for drying the drill ship can be reduced, and the drilling cost of the drill ship can be reduced.

1 is a view showing an example of a structure of a drill ship and a door pillar.
FIG. 2 is a view showing a drill ship structure according to a first embodiment of the present invention. FIG.
FIG. 3 is a view showing a drill ship structure according to a second embodiment of the present invention. FIG.
FIG. 4 is a view showing a drill ship structure according to a third embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The present invention will be described with reference to the embodiments shown in the drawings, but it is to be understood that various modifications and equivalent embodiments may be made by those skilled in the art without departing from the scope of the present invention. Therefore, the true scope of protection of the present invention should be defined only by the appended claims.

FIG. 2 is a view showing a drill ship structure according to a first embodiment of the present invention. FIG.

Referring to FIG. 2, a drum 20 is formed inside a drill ship 10. When the drill bit is viewed from above, the drum 20 is formed in the inside of the hull 10 and is an empty space passing through the upper and lower ends of the hull 10, and provides a space for the drill ship to drill at sea.

Referring to FIG. 2, a riser 30 is provided on the door frame 20 during a drilling operation. The upper end of the riser 30 is connected to a drilling tower (not shown) called Derrick and a drill pipe (not shown) is provided at the lower end of the riser 30 to penetrate the crust of the submarine, . The riser 30 has an approximately elongated shape as an assembly in which a plurality of unit units are connected to one another along the lengthwise direction.

As shown in FIG. 2, a trolley 40 for supporting and transporting a BOP (Blow Out Preventor) is provided in the upper part of the interior space 20 during a drilling operation. The BOP is a structure for controlling the pressure in the oil well or the gas field, and serves to prevent the oil or gas from being suddenly discharged from the oil well or the gas field.

A trolley support unit 42 may be provided at the lower end of the trolley 40 to support the trolley 40 when the trolley 40 is located at the upper end of the interior of the door 20. The trolley support unit 42 may have the form of a rail.

2, a support portion 50 for supporting the BOP, the trolley 40, and the trolley support unit 42 is provided in the upper portion of the door frame 20 and the lower portion of the trolley support unit 42. As shown in Fig. As described above, the support portion 50 may have a cofferdam structure, and a void space may be formed in the support portion 50. 2, the supporting part 50 forms the inner wall of the door 20 and the upper end of the supporting part 50 may be lower than the deck 100 of the drill ship.

The riser 30 can interfere with or collide with the support 50 during drilling when the support 50 extends to the bottom of the hull 10, 1, the relative movement between the drill ship and the riser 30 causes the riser 30 to interfere or collide with the edge portion of the support 50. In other words, when the support 50 is extended to the bottom as shown in FIG. 1, can do.

In order to prevent this, a chamfer 60 is formed at the lower end of the support portion 50 in the drill-type door structure according to the first embodiment of the present invention shown in FIG. 2, . The chamfer 60 may be formed so as to be parallel to the riser 30 when the pivot angle of the riser 30 is maximum within a range in which interference between the riser 30 and the hull 10 does not occur.

As shown in FIG. 2, when the chamfer 60 is formed at the lower end of the support portion 50, an additional space is formed in the lower portion of the door frame 20. Therefore, there is an effect that the range of relative motion between the riser 30 and the drillhose which interferes with the drillhound hull 10, or where no collision occurs, is further ensured.

FIG. 3 is a view showing a drill ship structure according to a second embodiment of the present invention. FIG.

Referring to FIG. 3, a support portion 52 for supporting the BOP, the trolley 40, and the trolley support unit 42 is provided in the upper portion of the door frame 20 and the lower portion of the trolley support unit 42, as in FIG. However, unlike FIG. 2, the support portion 52 provided in the drill-in door structure according to the second embodiment is provided only in the upper portion of the interior of the door 20. At this time, the support part 52 may be formed only above the water surface in the upper part of the interior of the door 20 when the drill ship floats on the sea. 2, the inside of the support portion 52 may have a hollow space, and the support portion 52 may be formed in a single material box shape. The lower end of the support portion 52 may have a chamfer 62 as in Fig. At this time, the chamfer 62 may be formed parallel to the riser 30 when the pivot angle of the riser 30 is maximum within a range in which interference between the riser 30 and the hull 10 does not occur.

As shown in FIG. 3, the support portion 52 forms an inner wall of the door 20, and may be formed lower than the deck 100 of the drill ship.

As shown in FIG. 3, when the support portion 52 is formed on the upper portion of the interior of the door 20, a further additional space is generated in the lower portion of the door 20 as compared with FIG. Therefore, there is an effect that the range of relative motion between the riser 30 and the drillhose which interferes with the drillhound hull 10, or where no collision occurs, is further ensured.

FIG. 4 is a view showing a drill ship structure according to a third embodiment of the present invention.

4, a support portion 54 for supporting the BOP, the trolley 40, and the trolley support unit 42 is provided in the upper portion of the door frame 20 and the lower portion of the trolley support unit 42, as in Fig. 4, the support portion 54 provided in the drill-in door structure according to the third embodiment of FIG. 4 forms the upper portion of the support portion 54 and supports the BOP, the trolley 40 and the trolley support unit 42 And a fixing member 58 that forms a lower portion of the support portion 54 and fixes the support member 56 to the hull 10. [ For example, the support member 56 may be a T-bar, and the fixation member 58 may be a bracket. In other words, unlike the second embodiment of FIG. 3, which is provided in the form of an integral box, the support 54 in the third embodiment can be composed of an assembly of support members 56 and fixing members 58 of different configurations . A plurality of fixing members 58 may be provided along the horizontal direction of the hull 10 to more effectively prevent the support member 56 from being deformed by the load of the support unit 42 or the like.

As shown in FIG. 4, the support 54 forms the inner wall of the door 20, and may be formed lower than the deck 100 of the drill ship.

According to the third embodiment shown in FIG. 4, a space in which the riser 30 can move relative to the drillhose is further secured than in the case of the second embodiment shown in FIG. In other words, the supporting member 56 and the fixing member 58, which are separate members having a relatively small volume compared to the second embodiment having the box-shaped support unit, are assembled to form the support unit, There arises the effect that the range of the relative motion between the drillhose and the riser 30 which does not cause interference or collision with the drill 10 is secured.

2 to 4, according to the drill-type door structure 20 according to the present invention, the riser 30 can be prevented from being in contact with the drillhole due to relative motion with the drillhose, A space that does not occur is secured.

That is, the upper enlargement space 200 formed by the support portion provided only in the upper portion of the door frame 20 and the lower enlargement space 300 formed by the chamfer 60 allow the riser 30 to move relative to the drill- A space in which no interference or collision with the drill ship is caused is secured. For example, if the riser 30 has a maximum swivel angle of about 8 degrees with the riser 30, which does not interfere with or collide with the drill ship due to relative movement with the drill ship, the upper enlargement space 200 and the lower When the enlarged space 300 is formed, the maximum turning angle of the riser 30, which does not cause interference or collision with the drill ship, can be enlarged to about 10 degrees.

10 - Hull
20 - Writing room
30 - riser
40 - Trolley
42 - trolley support unit
50, 52, 54 -
56 - Support member
58 - Fixing member
60, 62 - chamfer
100 - Deck
200 - Upper enlarged space
300 - lower enlarged space

Claims

In the drill ship,
A portal provided on the hull of the drill ship; And
A support for supporting the trolley support unit which is provided in the interior of the door frame and supports the trolley provided in the drill ship; / RTI >
The support portion extends to a bottom of ship of the drill ship,
The lower end of the support part has a chamfer structure,
Drill - and - frame structure.

The method according to claim 1,
Wherein the support portion is formed on an upper portion of the door frame,
Drill - and - frame structure.

The method of claim 2,
The support portion
A support member forming an upper portion of the support portion and supporting the trolley; And
A fixing member forming a lower portion of the support portion and fixing the support member to the drill-in; / RTI >
Drill - and - frame structure.

The method of claim 3,
The support member is T-
Wherein the fixing member is a bracket,
Drill - and - frame structure.

The method of claim 2,
The support portion has a void space,
Drill - and - frame structure.

In the drill ship,
In order to allow the riser provided on the door of the drill ship to move relative to the drill ship,
An upper enlarged space formed on an upper portion of the door frame; And
A lower enlarged space formed in a lower portion of the door frame; / RTI >
Drill - and - frame structure.