KR20130039928A - Drillship without moon-pool - Google Patents

Abstract

PURPOSE: A drillship without a moonpool is provided to facilitate a drilling work by easily moving a derrick to a position to be drilled with less power. CONSTITUTION: A drillship without a moonpool comprises a towing unit(120) and one or more air cushion devices(130) for transferring heavy objects. The towing unit is installed in one side of a derrick and connects a winch and a sheave block with a wire to support and move the derrick to the position to be drilled. The air cushion devices are arranged in a lower base of the derrick to move the derrick to the position to be drilled. The air cushion devices are composed of an expandable air cushion tube.

Description

Drillship without Moonpool {DrillShip without Moon-Pool}

The present invention relates to a drillship without a door pull, and more particularly, a drilling derrick without a door pull on the bottom of the drillship hull can be carried out by moving the drilling derrick from the center level of the ship to the side of the hull, that is, the drilling position. will be.

In general, a drillship is a ship equipped with drilling facilities for oil field development, and is equipped with various drilling equipments for drilling oil or gas existing in the basement of the seabed. The door pool is usually formed in the form of a rectangular opening in the bottom of the derrick lower hull of the drillship which allows a riser or drill pipe for drilling the back to the bottom of the seabed.

In addition, the upper portion of the door pool position is formed of a derrick (derrick) that is a structure that can easily move the drilling pipe or riser to the sea bottom.

In addition, around the derrick, a crane is installed to send the drilling pipe and riser from the upper part to the lower part of the derrick.

As an example of a conventional drillship, it is disclosed in Korean Patent Laid-Open Publication No. 1999-28714 (hereinafter referred to as "prior art document"). Briefly describing the contents of this prior art document, as illustrated in FIGS. 1 and 2, an oil tanker type hull 32 having a wide door pool 34 between the bow 36 and the stern 38. Equipped with.

The multi-tasking derrick (or derrick) 40 is coupled above the drilling rig 30 substructure above the door pool 34 and performs the main pipe work, while simultaneously working the main pipe from the single derrick through the door pool 34. Perform secondary tasks at the same time.

The bow thruster 42 and the stern thruster 44 are provided in front of and behind the drilling vessel 30.

In addition, first and second cranes 70 and 72 and a crane 82 are installed around the oil well 40.

Although some of the reference numerals shown in FIG. 2 have not been described, this is omitted for convenience of description only in accordance with the present invention.

Here, most conventional drillships are essentially formed with a door pool to lower the drilling pipe or riser from the derrick to the bottom of the sea floor.

However, since most of the conventional drillships need to be shifted for oil field development, there is a need to increase the speed of the drillship. Since the drillship has an opening-type door pool through the center of the hull, Due to the current flowing into the door pool, the vortex is generated inside the door pool, and the hull speed is reduced. Moreover, the drill ship itself has been caused by the sea water introduced into the door pool during the drilling work. Therefore, there was a problem causing trouble in the drilling operation.

Republic of Korea Patent Publication No. 1999-28714 (published: 1999.4.15)

The present invention has been invented to solve the above-mentioned conventional problems, the object of the present invention to move the derrick in the width direction of the ship without forming a door through the bottom of the hull to lower the drilling pipe to the sea floor It is to provide a drillship without a door pool.

The solution of the present invention for achieving the above object, as a drill ship having a derrick installed on the hull to enable drilling work,

Towing means for connecting and supporting a winch installed on an upper surface of a ship deck and a sheave block mounted on an upper end of the derrick with a wire; At the center of the drillship, the derrick includes an air cushion device for transporting heavy materials, which is composed of one or more air cushion tubes that are expanded by injecting compressed air while being provided with at least one of the lower bases of the derrick so as to move slowly and stably to the side of the drillship (drilling position). It is composed.

In addition, the derrick is configured to further include a floating support structure on one side of the derrick so that the derrick is expanded by the injection of compressed air after moving to the drilling operation position of the drillship side to support the sea at sea.

In addition, the air cushion device is provided in the insertion groove of the lower base of the derrick, compressed air is injected into the air cushion tube through the flow path formed in the lower base is expanded and at the same time, the compressed air is discharged to the lower surface of the air cushion tube air film Ejection holes are formed to form a derrick is to be moved, moved.

The derrick fixing bracket is formed on one side of the lower base of the derrick to be fixed by penetrating and engaging through the fastening member after the movement of the derrick, and a fixing bracket is formed at one end of the hull deck upper surface.

As described above, the present invention does not form a door pool, which has been formed inevitably in the related art, and easily moves the derrick to the drilling position on the side of the drillship with a small force so that the drilling operation can be performed, so that the vortex flows into the inflow of seawater due to the formation of the door pool. There is an effect that can be carried out smoothly by preventing the adverse effects on the drilling work or the ship shaking.

In addition, since the derrick is moved to the drilling position, the space where the derrick was originally secured is secured, and thus the import / export of the drilling pipe and the riser is easy.

In addition, two derricks can be provided as needed to move the drillship left and right side to perform drilling work, and there are advantages in that two holes can be drilled at the same time.

1 is a perspective view showing an example of a conventional drillship.
2 is a plan view of Fig.
3A is a front view illustrating a drillship according to an embodiment of the present invention.
FIG. 3B is a view illustrating a state in which the derrick partially moves in the lateral direction of the drillship in the state of FIG. 3A.
Figure 3c is a state diagram showing the state that the derrick is moved to the drilling position in the state of Figure 3b.
4A is an enlarged cross-sectional view of portion A of FIG. 3A.
Figure 4b is a view showing a state in which the compressed air is injected in the state of Figure 4a is inflated air cushion tube of the air cushioning device for weight transfer.
Figure 5 is a schematic diagram showing the arrangement of the air cushion device for transporting heavy materials applied to the drill ship according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Figure 3a is a front view showing a drillship according to an embodiment of the present invention. As shown in the figure, the drillship 100 according to the present invention is installed on the deck upper surface of the hull 101 to be movable, the side of the derrick 110 to support the derrick 110 and Towing means 120 are provided at intervals to be moved.

In addition, the lower base 111 of the derrick 110 is provided with an air cushion device 130 to move the derrick 110 in the width direction of the hull 101.

In addition, one side of the derrick 110 is provided with a floating support structure 140 (pontoon) to expand by compressed air to support the derrick 110 in sea water.

The towing means 120 is a winch 121 is fixed, installed on the upper surface of the hull 101, and when the wire 122 of the steel material wound on the winch 121 is wound on the upper end of the derrick 110, Sheave block 123 to be routed through.

In addition, the air cushion device 130 is composed of an air cushion tube 131 for introducing compressed air through the air compressor 150 is provided separately, this air cushion tube 131 is inserted into the lower base 111 The through hole 131a is formed in the lower center of the air cushion tube 131 so as to be coupled to the coupling protrusion 111b formed in the groove 111a.

Furthermore, the lower surface of the air cushion tube 131 has a structure in which a discharge hole (131b) is formed to discharge a portion of the compressed air introduced.

At this time, the lower base 111 of the derrick 110 so that the compressed air flows into the air cushion tube 131 is formed with a flow path 112 through which compressed air passes.

In addition, one or more air cushion devices 130 may be installed on the lower base 111. Preferably, an appropriate number of air cushion devices 130 are provided and installed according to the area of the lower base 111.

FIG. 5 is a schematic view illustrating a plurality of air cushion devices 130 arranged on the lower base 111 of the derrick 110, and may be arranged in a plurality of circumferences of the through hole 111c through which the riser and the drilling pipe pass. .

In addition, since the compressed air of the air compressor 150 should be injected, the compressed air of the air compressor 150 is injected by connecting the hose 152 in communication with each air cushion device 130 via the pressure regulator 151. Be sure to

The hose 152 is connected to the flow path 112 shown in FIG. 4A to allow compressed air to be delivered to the air cushion tube 131.

5 is a schematic view showing the arrangement of the air cushion device 130, in actual application, the arrangement of the air compressor 150, pressure regulator 151, hose 152 during the movement of the derrick 110 Arrange it so that it does not interfere.

For example, the air compressor 150, the pressure regulator 151, the hose 152, and the like may be fixed to an upper portion of the lower base 111 or a predetermined position of the derrick 110, and the derrick 110 may be moved. .

In addition, the air cushion device 130 may be configured as one module, if necessary.

In other words, the air cushion tube 131 and the frame surrounding and supporting the air cushion tube 131 and compressed air are injected into the frame and the outside of the air cushion tube 131. And after forming a structure in which a flow path to be discharged into one module, it can be used by installing the appropriate number in the lower base 111 of the derrick 110.

In this case, each air cushioning device 130 may be installed by forming accommodation grooves on the bottom of the lower base 111.

On the other hand, the floating support structure 140 allows compressed air to flow through the air compressor, when not in use as shown in Figure 3a is fixed to the side of the derrick 110, the fixed state at the time of use Release and blow the compressed air into the seawater to be supported.

The floating support structure 140 is supported by buoyancy in the seawater while maintaining an expanded state by injecting compressed air therein, thereby maintaining a rigidity even if a load is applied.

The floating support structure 140 is made of a common flexible material, such as a pontoon that is not easily torn, and may be configured as a pleat (aka bellows type).

In addition, the floating support structure 140 may be installed on the bottom surface of the lower base 111 of the derrick in an appropriate number as needed to have a stable support state.

Further, the derrick 110 is formed by forming guide rails (not shown) at both sides of the lower base 111 of the derrick 110 along the moving path of the derrick 110 in the corresponding area of the upper surface of the drillship hull 101. It can be moved more stably.

In addition, after the derrick 110 is moved to the drilling position, the one end of the lower base 111 of the derrick 110 is fixed to the hull and the derrick 110 for the purpose of maintaining the drilling position of the derrick 110 The derrick fixing bracket 114 is formed, and the fixing bracket 104 is formed at the end of the hull 101 in the width direction of the upper surface, and as shown in FIG. 3C, after moving to the drilling position of the derrick 110. In order to maintain a firmly secured state, when the bracket 114 and the fixing bracket 104 reach the overlapping position, they are fastened by a fastening member 115 having a configuration such as a bolt and a nut to be connected to the hull side direction (Y axis). And fix the derrick's movement in the bow and stern direction (X axis) and keep the derrick's rotational movement, ie Rx, so that the reaction force of the moment due to the rotational movement does not act on the hull.

In addition, the drillship 100 has a structure in which one or more ballast tanks 105 are formed, and as shown in FIG. 3C, when the derrick 110 is moved to the drilling position, the ballast tank 105 is provided. The ballast water is filled in the ballast tank 105 located at the opposite end of the ballast. In this way, the balance of the drillship 100 biased by the moved derrick 110 can be more surely maintained.

According to an embodiment of the present invention, when the riser 160 and the drilling pipe 161 are to be constructed up to the bottom of the sea floor, as shown in FIGS. 3A to 3C, a derrick located in the center of the deck upper surface of the hull 101 The 110 may be moved in the width direction (lateral direction) of the drillship hull, and then the drilling pipe 161 or the like may be lowered to the seawater bottom surface through the derrick 110.

As shown in Figure 4a and 4b, when moving the derrick 110 to the drilling position, first through the air compressor 112, the compressed air through the flow path 112 of the lower base 111 of the derrick 110 When injected, the air cushion tube 131 in communication with the flow path 112 is expanded.

As the air cushion tube 131 expands, the lower base 111 slightly rises at an interval from an upper surface of the hull 101. The air cushion tube 131 has an outlet hole 131b formed on an inner circumferential surface thereof. Is formed, the air cushion tube 131 is expanded by the injection of compressed air while the compressed air is discharged to the upper surface of the hull through the discharge hole (131b).

Therefore, the compressed air is discharged to the bottom of the air cushion tube 131 by the compressed air discharged through the discharge hole 131b of the expanded air cushion tube 131 to form an air film while the air cushion tube 131 is formed. It floats at some distance from the upper surface of the drillship hull 101, and becomes a non-contact state (injury) from the deck upper surface of the drillship.

Of course, during the movement of the derrick 110 is maintained in a state of continuously supplying compressed air through the air compressor 140.

In this state, when the derrick 110 is pushed in the width direction, since the derrick 110 is in a non-contact state (airborne state) with the upper surface of the hull 101 by compressed air, the load of the derrick 110 (about 1 ton) Compared to the above) it can be moved to the drilling position with very little force.

As described above, after the derrick 110 is moved to the drilling position (one end in the width direction of the drillship), the fixing bracket 104 and the derrick fixing bracket 114 are fastened through the fastening member 115 at the point of coincidence. , Fix it.

In addition, one side of the derrick 110 is supported by the towing means 120, and when the derrick 110 moves, the wire 122 is properly released from the winch 121 to smoothly move the derrick 110. At the same time, when moving out of the hull 101 of the drillship, it can be properly caught and guided through the wire 122, so that the derrick 110 is stably in the drilling position without falling out of the hull 101. Will be.

In addition, one side of the derrick 110 is provided with a floating support structure 140, and after the derrick 110 moves to the drilling position, the floating support structure 140 is lowered in the seawater direction, and then compressed air Inflate by expanding so that it is supported by buoyancy in seawater.

Accordingly, since the derrick 110 must move to the side of the hull 101 to receive the various external forces acting on the derrick 110 to maintain the drilling position, supported by the towing means 120 on one side, floating on the other side It is supported by the expression support structure 140 can maintain a stable state.

After the derrick 110 is moved to the drilling position, drilling is performed by lowering the riser 160 and the drilling pipe 161 to the bottom of the seabed through the derrick 110 using a crane.

In addition, the upper surface of the hull deck of the drillship and the guide rail is formed at both side positions in the moving direction of the derrick 110 so that the derrick 110 can be more stably moved when moving to the drilling position.

In addition, since the drilling operation is performed while the derrick 110 is moved to one side of the hull 101 in the width direction, the load may be eccentric and may be in an unstable state.

Of course, the ballast tank 105 inside the hull 101 in order to maintain a stable support state by the traction means 120 and the fastening member 115 and the floating support structure 140, but to maintain a more balanced state The ballast water is filled in the ballast tank 105 positioned at the edge of the hull 101 to balance the drillship.

On the other hand, if you want to reposition the derrick 110, which has moved to the drilling position again, by separating the fastening member 115 is fixed to the derrick 110, by the operation of the winch 121 forming the towing means 120 Moving the derrick 110 toward the center of the deck upper surface of the drillship, the first air cushion tube 131 of the left front of the air cushion tube 131 constituting the air cushion device 130 provided in the lower part of the derrick 110 At the moment of contacting the deck upper surface of the drillship, the air cushion tube 131 is expanded while the compressed air is injected by the air compressor 150, thereby floating from the upper surface of the deck to be in a non-contact state.

Accordingly, the winch 121 can quickly return the derrick 110 from the drilling position to the center position of the deck upper surface of the drillship.

At this time, when the derrick 110 is returned, the compressed air of the floating support structure 140 supported by the seawater is extracted to be fixed to the side position of the derrick 110 in a reduced state.

On the other hand, the present invention by installing two derrick 110 can be moved in the opposite direction, that is, both sides of the hull 101, at the same time drilling of two holes at the same time.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims and their equivalents. It will be possible. Therefore, the embodiments disclosed in the present invention and the accompanying drawings are intended to illustrate and not limit the technical spirit of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments and the accompanying drawings . The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

100: drillship
101: hull
104: fixing bracket
105: ballast tank
110: Derrick
111: base
111a: Insertion groove
111b: Coupling protrusion
111c: through hole
112: Euro
114: fixing bracket
115: fastening member
120: towing means
121: winch
122: wire
123: sieve block
130: air cushion device for transporting heavy materials
131: air cushion tube
131a: through hole
131b: discharge hole
132 frame
140: floating support structure
150: air compressor
151: pressure regulator
152: hose
160: riser
161: Drilling Pipe

Claims (4)

As a drill ship with a derrick installed on the hull to enable drilling work,
A traction means installed at one side of the derrick to connect the winch and the sheave block mounted on the top of the derrick with a wire to guide and move the derrick to a drilling position;
A weight cushion air cushion device comprising an air cushion tube inflated by injecting compressed air while being provided with at least one of the lower bases of the derrick so that the derrick located at the center of the deck upper surface of the ship is movable to the drilling position;
The doorless drillship, characterized in that is configured to include a.
The method according to claim 1,
When the derrick is moved to the drilling position, one side of the derrick is expanded by the injection of compressed air from the step of leaving the hull side from the side of the derrick so that the derrick is supported on the sea side is characterized in that the floating support structure further comprises Drillship without door glue.
The method according to claim 1,
The air cushion device is provided in the insertion groove of the lower base of the derrick while compressed air is injected into the air cushion tube through the flow path formed in the lower base and expanded, and compressed air is discharged to the lower surface of the air cushion tube to form an air film. The doorless drill drill, characterized in that the discharge hole is formed so that the derrick is injured, moved.
The method according to claim 1,
After the derrick moves to the drilling position through the fastening member, the fixing bracket is formed on one side of the lower base of the derrick to be fixed by penetrating, coupled to one end of the upper surface of the hull drillless characterized in that the fixing bracket is formed.

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