KR20150144982A - Marine Drilling System - Google Patents

Abstract

A marine drilling system having a moon pool in a hull is disclosed. The marine drilling system comprises: a recess formed in an upper portion of the moon pool; and a recess forming member installed in the lower portion of the moon pool to form the recess. The recess forming member has a shape to enable sea water to be introduced and discharged to the inside and the outside.

Description

[0001] Marine drilling system [

The present invention relates to a marine drilling facility, and more particularly, to a marine drilling facility configured to reduce seawater flow occurring in a recess.

Along with the development of submarine mining technology, drilling lines have been developed with drilling facilities suitable for marginal field or deep sea oil development. Conventional submarine drilling has been mainly used for a rig ship or a rigid platform for underwater drilling that can be sailed only by another tugboat and performs submarine drilling with anchorage at one point of the sea using a mooring device. In recent years, a drill ship, which is equipped with advanced drilling equipment and manufactured in the same form as a ship, has been developed and used for deep sea drilling.

Such an ocean drilling facility includes a Moon Pool for entering and exiting various equipment for drilling, which is a rectangular parallelepiped or cylindrical space formed to penetrate vertically between the deck and the bottom of the hull. In addition, a marine drilling plant having a two-end structure has an auxiliary space for temporarily lowering drilling equipment such as BOP (Blow Out Preventer), which is called a recess.

However, in the conventional drill ship, there is a problem that the crew working on the drilling equipment or the hull installed on the top of the drum can be damaged by the seawater flow generated in the recess.

Hereinafter, referring to FIG. 1, a principle of generating a large sea water flow in the recess will be described.

1 is a partial side view of a conventional drill-in recess.

Sea waves generated by the wind are always present outside the hull 1 and seawater in the interior of the hatchery 2 receives the energy from the sea waves outside the hull 1 to generate the wave 5a.

Sea waves can be classified into deep-sea waves and deep-sea waves depending on the relationship between depth and wavelength. Sea waves in the case where the water depth is deeper than one-half of the wavelength is called deep water waves and the sea depth is shallower than one- Is called a deep sea wave.

The deep-sea waves are also called longwaves, and water particles are subjected to elliptical motion by the frictional force of the seabed since they are affected by the seabed. The propagation velocity of the shallow wave is irrelevant to the wavelength and is related only to the depth of water. Therefore, the progressive velocity of the shallow wave slows down as the depth of water becomes shallower. As the propagation speed of the deep sea wave slows down, the kinetic energy that is reduced changes to the potential energy, so that as the coastal wave approaches the coast, the wavelength becomes shorter and the wave height becomes higher.

For example, in the case of a tsunami that has a characteristic of shallow waves, if a tsunami occurs with an extremely long wavelength of 100 to 200 kilometers in the distant sea due to an earthquake, However, as the tsunami approaches the shore, the depth of the tsunami becomes shallower, slowing down the process, reducing the wavelength to several kilometers, and increasing the tsunami to tens of meters.

When the wave 5a generated in the interior space 2 has a characteristic of a deep sea wave, the depth of water in the recess 3 becomes shallow, so that the sea wave 5b in the recess 3, . The wave 5b in the recess 3 having a high crest causes a large seawater flow and the wave 5b in the recess 3 rides on the inside wall surface 2a of the inside of the recess 3, (4) damage to crew members who are working on the hull (1).

Hereinafter, the interior wall surface 2a of the interior wall means the inner wall surface of the interior wall 2 connected to the recess 3. [

As a technique for lowering the flow of seawater in a recess in a conventional door frame, there have been proposed a door frame resistance reducing device disclosed in Korean Patent Laid-Open No. 10-2010-0020613, Korean Patent Application No. 10-2011-0101821, There is a floating floating structure of Patent No. 10-2011-0027404.

However, the conventional culture paper resistance reducing apparatus, culture paper resistance reducing apparatus, and floating sea structure do not provide a solution to the fundamental cause of a large sea water flow, but merely provide a structure for passively reducing the sea water flow There was a limit to preventing damage to the crew and damage to drilling equipment.

SUMMARY OF THE INVENTION The present invention has been made in order to solve such a conventional problem and it is an object of the present invention to provide a marine drilling apparatus and a marine drilling method which are configured to reduce the seawater flow in the recess, The purpose is to provide facilities.

According to an aspect of the present invention, there is provided an offshore drilling rig including a portal on a hull, the apparatus comprising: a recess formed on the door frame; And a recess forming member provided under the door frame to form the recess, wherein the recess forming member has a shape in which seawater can flow in and out.

The recess forming member may be formed of a plate having a plurality of holes, at least one of an upper surface, a lower surface, a front surface, a first side surface, and a second side surface.

Wherein the recess forming member comprises: a lateral truss member having one side end vertically connected to the interior side wall surface of the interior; A vertical truss member vertically coupled to the horizontal truss member and installed to be horizontal with the bottom surface; A vertical truss member vertically coupled to the horizontal truss member and installed to be perpendicular to the bottom surface; And a first warp truss member diagonally installed on each side of the grid formed by intersecting the lateral truss member, the vertical truss member, and the vertical truss member.

The recess forming member may further include a second warp truss member diagonally installed to penetrate the grid formed by intersecting the horizontal truss member, the vertical truss member, and the vertical truss member.

The recess forming member may further include a plate having at least one of an upper surface, a lower surface, a front surface, a first side surface, and a second side surface having a plurality of holes.

According to another aspect of the present invention, there is provided a method for drying a marine drilling facility to prevent damages caused by seawater flowing in a door frame, the method comprising: The method comprising the steps of: providing a recess forming member having a recess formed therein;

The step of providing the recess forming member may include forming a plurality of holes in at least one of the upper surface, the lower surface, and the plate constituting the front surface of the recess forming member.

The step of installing the recess forming member may include the steps of providing one side end of the lateral truss member so as to be perpendicularly connected to the interior side wall surface of the interior of the interior space; Installing a vertical truss member vertically coupled to the transverse truss member and horizontal with the bottom truss member; Installing a vertical truss member vertically coupled to the transverse truss member and perpendicular to the bottom surface; And a first inclined truss member diagonally installed on each side of the grid formed by intersecting the lateral truss member, the vertical truss member, and the vertical truss member; . ≪ / RTI >

The step of installing the recess forming member may further include the step of installing the second warp truss member diagonally through the grid formed by intersecting the horizontal truss member, the vertical truss member, and the vertical truss member have.

Wherein the step of providing the recess forming member includes a step of forming a recessed portion in a plate having a plurality of holes in at least one of upper, lower, front, first and second side faces of the recess forming member of the recess forming member The method comprising the steps of:

According to the marine drilling rig of the present invention, seawater in the interior of the interior space can be freely moved in and out of the recess forming member by changing the shape of the recess forming member, so that even if the sea water inside the interior space has a characteristic of a deep sea wave, It is possible to mitigate the phenomenon of generation of a wave having a large wave height.

Therefore, according to the marine drilling facility of the present invention, it is possible to provide a space for storing and drilling the drilling equipment in the door frame, while preventing damage to the drilling equipment or the risk to the crew due to the large sea water flow in the recess .

FIG. 1 is a side view schematically showing a drillhose formed with a recess in a door frame according to a conventional technique.
2 is a side view schematically showing a marine drilling rig according to a first preferred embodiment of the present invention.
3 is a plan view of Fig.
4 is a side view schematically showing a marine drilling rig according to a second preferred embodiment of the present invention.
5 is a plan view of Fig.
6 is a perspective view schematically showing one lattice of the recess forming member according to the second preferred embodiment of the present invention.
7 is a perspective view schematically showing a marine drilling rig according to a third preferred embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The marine drilling rigs of the following embodiments can be installed in all marine structures for submarine drilling where recesses are formed in a portal, such as a league line, a drill ship, and the like. In addition, the following examples can be modified in various forms, and the scope of the present invention is not limited to the following examples.

FIG. 2 is a side view schematically showing a marine drilling rig according to a first preferred embodiment of the present invention, and FIG. 3 is a plan view of FIG. 2.

Referring to FIGS. 2 and 3, the marine drilling rig of the present embodiment comprises a platform 2 formed on the hull 1; A recess (3) formed in the interior (2) of the drum and capable of temporarily positioning the drilling rig (4); And a recess forming member (31) installed at the bottom of the door frame (2) to form the recess (3).

The door frame 2 is formed to penetrate the hull 1 in the vertical direction so that various drilling rigs 4 for the drilling operation at the seabed can enter and exit, and can have a rectangular parallelepiped shape or a cylindrical shape.

The recess 3 is formed in the interior of the door 2 to provide a place where the drilling equipment 4 or the like such as the BOP can be temporarily lowered. In general, the recess 3 is located below the aft- However, the position where the recess 3 of the present invention is formed is not limited to the aft side sea level.

Each surface of the recess forming member 31 of this embodiment is formed of a plate and each plate can be made of a metal material such as iron having excellent durability and the metal material can be coated with a coating material having excellent corrosion resistance against seawater .

The upper face 31a, the lower face 31b, the front face 31c, the first side face 31d, and the second face 31b of the recess forming member 31 are formed so that seawater can move into and out of the recess forming member 31. [ At least one of the side surfaces 31e is formed of a plate having a plurality of holes 6. The top surface 31a, the bottom surface 31b, the front surface 31c, the first side surface 31d and the second side surface 31e of the recess forming member 31 so that the seawater can smoothly flow into and out of the recess forming member 31. [ It is preferable that a plurality of holes 6 are formed by a plate having a plurality of holes 6.

Each surface of the recess forming member 31 is formed of a plate having a plurality of holes 6 but a plurality of holes 6 are not formed in the inner side wall surface 2a connected to the recesses 3 .

The plurality of holes 6 formed on each surface of the recess forming member 31 of this embodiment may be formed so as to be aligned in the width and length direction of the plate. The holes 6 also allow the recesses 3 to provide adequate space for storage and drilling operations of the drilling rig 4 and of suitable diameters and spacings to enable the operator to walk in the recesses 3 Lt; / RTI >

FIG. 4 is a side view schematically showing a marine drilling rig according to a second preferred embodiment of the present invention, and FIG. 5 is a plan view of FIG. 6 is a perspective view schematically showing one of the grids of the recess forming member according to the second preferred embodiment of the present invention. The horizontal truss member 7a, the vertical truss member 7b and the vertical truss member 7c forming one grid shown in Fig. 6 can be shared with adjacent other unit grids.

Referring to FIGS. 4 and 5, the marine drilling facility of the present embodiment includes, in the same manner as the marine drilling facility of the first embodiment, a platform 2 formed on the ship 1; A recess (3) formed in the interior (2) of the drum and capable of temporarily positioning the drilling rig (4); And a recess forming member (32) installed at the bottom of the door frame (2) to form the recess (3).

However, the recess forming member 32 of this embodiment has a truss structure, unlike the recess forming member 32 of the first embodiment. The truss structure means a structure in which a plurality of rectilinear members are combined to form a triangle, and the rectilinear members are combined to form a triangle.

The recess forming member 32 of the present embodiment has the horizontal truss member 7a, the vertical truss member 7b, the vertical truss member 7c, the first warp truss member 7d, and the second warp truss member 7e .

The lateral truss members 7a are vertically (A direction) connected to the interior side wall 2a of the interior side at one end thereof, and are plurally arranged so as to be aligned in the vertical and horizontal directions. A plurality of vertical truss members 7b are provided so as to be perpendicular to the lateral truss members 7a and to be horizontal with respect to the bottom surface (direction B). A plurality of vertical truss members 7c are provided so as to be perpendicular to the lateral truss members 7a and to be perpendicular to the bottom surface (direction C). Four lateral truss members 7a, four vertical truss members 7b and four vertical truss members 7c form each corner of the recess forming member 32. As shown in Fig.

4 and 5, the first inclined truss member 7d of the present embodiment is formed by vertically crossing the transverse truss member 7a, the vertical truss member 7b, and the vertical truss member 7c, Are installed diagonally to be located on each side of the grid.

6, the first warp truss member 7d includes a first vertex 8a and a third vertex 8c, a first vertex 8a and a sixth vertex 8f, a first vertex 8b, 8a and the eighth vertex 8h and the second vertex 8b and the fourth vertex 8d, the second vertex 8b and the fifth vertex 8e, the second vertex 8b and the seventh vertex 8g The third vertex 8c and the sixth vertex 8f, the third vertex 8c and the eighth vertex 8h, the fourth vertex 8d and the fifth vertex 8e, the fourth vertex 8d, And a seventh vertex 8g, a fifth vertex 8e and a seventh vertex 8g, a sixth vertex 8f and an eighth vertex 8h, And an inclined truss member 7d is provided.

4 and 5, the second warp truss member 7e of the present embodiment is formed by vertically crossing the horizontal truss member 7a, the vertical truss member 7b, and the vertical truss member 7c, As shown in Fig.

6, only the second inclined truss member 7e connecting the first vertex 8a and the seventh vertex 8g is shown for the sake of convenience. However, in the second inclined truss member 7e of the present embodiment, The first vertex 8a and the seventh vertex 8g, the second vertex 8b and the eighth vertex 8h, the third vertex 8c and the fifth vertex 8e and the fourth vertex 8d, And the sixth vertex 8f, and four second truss members 7e are provided in one grid.

The recess forming member 32 of the present embodiment includes both the first warp truss member 7d and the second warp truss member 7e but the first warp truss member 7d and the second warp truss member 7e ) May be included.

The recess forming member 32 of this embodiment facilitates the fabrication of the two-end stop 2 by forming a truss structure so that the seawater can smoothly flow in and out of the recess forming member 32 .

The horizontal truss member 7a, the vertical truss member 7b and the first truss member 7d of the present embodiment are designed such that the recess 3 can provide space for storage and drilling operations of the drilling rig 4 And it is possible to have an appropriate interval so that the operator can walk in the recess 3. One side end of the lateral truss member 7a can be welded or bolted to the inside wall surface 2a of the door inner wall 2a and can be fixed to the lateral truss member 7a through the vertical truss member 7b, the vertical truss member 7c, The first warp truss member 7d and the second warp truss member 7e may be welded or bolted to each other so as to intersect with each other.

7 is a perspective view schematically showing a marine drilling rig according to a third preferred embodiment of the present invention.

Referring to FIGS. 4, 5 and 7, the marine drilling facility of the present embodiment includes a platform 2 formed on the hull 1, like the marine drilling facility of the second embodiment; A recess (3) formed in the interior (2) of the drum and capable of temporarily positioning the drilling rig (4); And a recess forming member 33 provided under the door frame 2 to form the recess 3 and the recess forming member 33 has a truss structure.

7, a plate having a plurality of holes 6 is shown only on the upper surface 31a of the recess forming member 33. However, in the present embodiment, At least one of the upper face 31a, the lower face 31b, the front face 31c, the first side face 31d and the second side face 31e of the sheath forming member 33 is formed in the recess forming member 31 of the first embodiment, And a plate having a plurality of holes (6).

When the recess 3 includes the plate having the plurality of holes 6 on the upper surface 31a of the recess forming member 33, the recess 3 is formed in the recess 3, as compared with the recess forming member 31 made only of the truss structure of the second embodiment, The drilling rig 4 can be positioned more stably and the operator can walk more conveniently when he / she is working in the recess 3. [ Compared with the recess forming member 31 formed of a plate having the plurality of holes 6 of the first embodiment, the structure strength is improved by including the truss structure.

The marine drilling rig of the present invention includes a recess forming member having a structure in which seawater can smoothly flow in and out, so that even if the sea wave inside the interior of the recess has a characteristic of a deep sea wave, It is possible to alleviate the phenomenon that the depth of water becomes shallow, thereby alleviating the phenomenon of causing a large sea water flow in the interior space.

8, the recess forming members 31, 32, and 33 have the upper surface 31a, the lower surface 31a, the lower surface 31a, It may be installed above the sea level.

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 and scope of the invention. It is.

1: Hull 2:
2a: Inner wall face of the interior wall 3:
31, 32, 33: recess forming member 31a: upper surface
31b: When it is 31c: Front
31d: first side 31e: second side
4: Drilling equipment 5a, 5b: Sea water
6: hole 7a: lateral truss member
7b: vertical truss member 7c: vertical truss member
7d: first inclined truss member 7e: second inclined truss member

Claims (10)

An offshore drilling plant including a portal formed on the hull,
A recess formed on the upper surface of the door frame; And
And a recess forming member provided under the door frame to form the recess,
Wherein the recess forming member has a shape in which seawater can flow in and out. The method according to claim 1,
The recess forming member may be formed,
Wherein at least one of an upper surface, a lower surface, a front surface, a first side surface, and a second side surface is formed of a plate having a plurality of holes. The method according to claim 1,
The recess forming member may be formed,
A lateral truss member having one end connected vertically to the inside wall surface of the interior space;
A vertical truss member vertically coupled to the horizontal truss member and installed to be horizontal with the bottom surface;
A vertical truss member vertically coupled to the horizontal truss member and installed to be perpendicular to the bottom surface; And
A first warp truss member diagonally installed on each side of the grid formed by intersecting the lateral truss members, the vertical truss members, and the vertical truss members;
, A marine drilling facility. The method of claim 3,
The recess forming member may be formed,
Further comprising a second warp truss member diagonally installed to penetrate a grid formed by intersecting the lateral truss members, the vertical truss members, and the vertical truss members. The method according to claim 3 or 4,
The recess forming member may be formed,
Wherein the at least one of the top, bottom, front, first and second sides further comprises a plate having a plurality of holes. As a method for drying marine drilling equipment to prevent damages caused by seawater flow generated in a door frame,
And installing a recess forming member having a shape such that seawater can flow into and out of the lower portion of the door frame. The method of claim 6,
Wherein the step of providing the recess forming member comprises:
Forming a plurality of holes in at least one of the upper surface, the lower surface, and the front surface of the recess forming member. The method of claim 6,
Wherein the step of providing the recess forming member comprises:
Installing one end of the lateral truss member so as to be perpendicular to the inside wall surface of the interior of the interior space;
Installing a vertical truss member vertically coupled to the transverse truss member and horizontal with the bottom truss member;
Installing a vertical truss member vertically coupled to the transverse truss member and perpendicular to the bottom surface; And
Installing a first inclined truss member diagonally on each side of the grid formed by intersecting the lateral truss member, the vertical truss member, and the vertical truss member;
And a method of drying an ocean drilling plant. The method of claim 8,
Wherein the step of providing the recess forming member comprises:
Further comprising the step of installing the second inclined truss member diagonally through the grid formed by intersecting the transverse truss member, the vertical truss member, and the vertical truss member. The method according to claim 8 or 9,
Wherein the step of providing the recess forming member comprises:
Further comprising the step of providing a plate having a plurality of holes in at least one of the upper surface, the lower surface, the front surface, the first side surface, and the plate constituting the second side surface of the recess forming member of the recess forming member. Equipment drying method.

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