KR102196984B1 - A drillship - Google Patents

Abstract

The present invention relates to a drillship, comprising a mud pit for storing mud to be supplied to a drilling pipe in a drillship floating in the ocean and drilling the seabed, wherein the mud pit is arranged in a plurality of grids and engraved cylindrical It is characterized by having a mud tank.

Description

Drillship {A drillship}

The present invention relates to a drillship.

As the use of resources such as petroleum has skyrocketed due to the recent rapid industrialization, stable production and supply of petroleum is emerging as a very important problem. However, a lot of drilling has already been made for oil fields in continental or coastal waters, and in recent years, attention has been focused on the development of oil fields located in deep waters, and drillships are generally used to drill such deep-sea oil fields.

Drillship is an offshore structure that is manufactured in a shape similar to a ship so that it can navigate with its own power and equipped with advanced drilling equipment.It is possible to collect crude oil or gas in a deep sea area where the installation of an offshore platform is impossible. There is an advantage in that drilling can be terminated at, and drilling can be carried out again by moving to another point.

Such a drillship includes a derrick having a Moonpool structure in the form of penetrating vertically, located above the moonpool, and having drilling equipment. Hereinafter, a process of drilling the drillship in the seabed will be described.

First, the drillship uses its own power to move to the drilling target area and drives a dynamic positioning system (DPS) using a plurality of thrusters to maintain the position.

After that, the drillship is to connect a drill bit to a drill pipe and connect a plurality of drill pipes to a sufficient length using a hoisting system and a handling system provided in the derrick. After descending to the bottom of the sea through a rotating system (Rotating System) to rotate the drill pipe to form a borehole.

When drilling is completed in the first time, derrick recovers the drill pipe, installs a casing pipe in the borehole, performs cementing work to fill concrete between the casing pipe and the borehole, and rebuilds the drill pipe. By repeatedly performing the drilling operation used and the casing and cementing operation to install the casing pipe, the shape of the borehole having a certain depth is maintained.

If the casing pipe is sufficiently installed to prevent the borehole from collapsing, a BOP (Blow Out Preventer) is connected to the riser to be coupled to the borehole, and the inside of the riser becomes a movement path for the drill pipe and the casing pipe.

However, during the drilling process, it is necessary to lubricate and cool the drill bit and to treat crushed material such as rock mass generated inside the borehole. Therefore, the drillship supplies mud to the inside of the drill pipe so that the mud is discharged from the distal end of the drill bit, and after the mud performs lubrication and cooling of the drill bit, the upper part through the inside of the riser from the outside of the drill pipe together with the ground material. It uses the Mud Circulation System to be recovered. The recovered mud is reused after the crushed material is filtered.

Drillship drives such a mud circulation system and repeatedly performs drilling, casing, and cementing operations until the drill bit reaches the well. In this case, as the diameter of the casing pipe used for the casing decreases, relatively Drilling can be continuously implemented by replacing the small sized drill bit.

As such, the drillship includes a system for installing and using drill pipes and risers, a system for using mud, etc., and a moonpool structure, a derrick structure, and a loading structure for smoothly implementing drilling using these systems. Since it has to be placed in a certain space, research and development are continuously being made as a fairly high technology is required.

The present invention was created to solve the problems of the prior art as described above, and an object of the present invention is to allow the panel deck, the drill floor, and the catwalk deck to be provided side by side at the same height, thereby enabling the transfer of the drilling pipe before and after the tower. It is to provide a drillship that increases the efficiency of drilling work.

It is also an object of the present invention to provide a drillship so that an engine casing is provided on the left and right sides of a well test area so that a burner boom can be rotated to and maintained in a well test area without interference.

It is also an object of the present invention to provide a riser tensioner inside the hull to increase the endurance of the riser tensioner, and to form an opening outward from the portion where the tensioner equipment for operating the riser tensioner is provided to discharge high-pressure gas, etc. to protect the source. It is to provide a drillship that can be done.

In addition, an object of the present invention is that it is possible to transfer the riser from the auxiliary well to the main well by using a plurality of skid carts that can be backed up with each other, so that the stability of the drilling operation can be secured, and the skid cart can be used for fixing the mouth hole. It is to provide drillship.

In addition, it is an object of the present invention to use an MPD module to minimize the casing to withstand pressure in the oil well when drilling, and to provide a drillship that minimizes unnecessary structural changes by securing an installation space of the MPD module near the cabin in advance. It is to do.

A drillship according to an embodiment of the present invention includes a mud pit for storing mud to be supplied to a drilling pipe in the drillship floating in the ocean and drilling the sea floor, wherein the mud pit is arranged in a plurality of grids and a hull angle It is characterized by having a cylindrical mud tank.

Specifically, in the mud pit, a reinforcing material may be omitted in the inside of the mud pit as the mud tank, which has been engraved, serves as a pillar.

Specifically, the mud pit may be provided with a reinforcing material only outside.

Specifically, the mud tank may have an agitator for mixing the mud to prevent curing of the mud.

Specifically, it may further include a mud pump for pumping the mud.

Specifically, it may further include a mud treatment unit for recycling the mud circulating through the drilling pipe.

The drillship according to the present invention maximizes the efficiency of drilling work by allowing the panel deck, catwalk deck, and drill floor to form one flush deck having a constant height, thereby enabling the transfer of the drilling pipe to the front and rear of the tower.

In addition, in the drillship according to the present invention, by disposing the engine casing on the left and right sides of the well test area to protrude outward, the area of the well test area is sufficiently secured and the rotation of the burner boom is not interfered.

In addition, in the drillship according to the present invention, the riser tensioner can be placed inside the hull to protect it from the outside, and by providing an opening in the side shell plate near the tensioner equipment to discharge high-pressure gas, it is possible to promote work safety.

In addition, the drillship according to the present invention is provided to be movable back and forth in the moonpool, and as the riser is moved using at least two skid carts that can be backed up to each other, the riser movement operation is stopped even if one of the skid carts fails It can be prevented, and efficiency can be secured by fixing the inside of the mouse hole or the rotary with a skid cart.

In addition, the drillship according to the present invention, by securing the installation space of the MPD module near the cabin, can implement a retrofit that reduces unnecessary structural changes or installation of additional items when the shipowner requests the installation of the MPD module, and the MPD module After installation, it is possible to minimize the installation of the casing by controlling the pressure caused by gas ejected from the oil well during drilling.

1 and 2 are side cross-sectional views of a drillship according to an embodiment of the present invention.
3 is a front cross-sectional view of A-A' in FIG. 1.
4 is a front cross-sectional view of B-B' in FIG. 2.
5 is a front cross-sectional view of C-C' in FIG. 1.
6 is a front cross-sectional view of D-D' in FIG. 2.
7 is a plan view of a drillship according to an embodiment of the present invention.
8 is a plan cross-sectional view of E-E' in FIG. 1.
9 is a plan cross-sectional view of F-F' in FIG. 1.
10 is a plan cross-sectional view of G-G' in FIG. 1.
11 is a diagram illustrating a mud flow in a drillship according to an embodiment of the present invention.
12 is a view showing a skid cart of a drillship according to an embodiment of the present invention.
13 is a diagram illustrating fluid flow in a drillship according to an embodiment of the present invention.

Objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments associated with the accompanying drawings. In adding reference numerals to elements of each drawing in the present specification, it should be noted that, even though they are indicated on different drawings, only the same elements are to have the same number as possible. In addition, in describing the present invention, when it is determined that a detailed description of related known technologies may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, in this specification, it is noted that the drillship (1) is used in the sense of encompassing all facilities floating on the sea and drilling the seabed (a drilling vessel having a ship shape, a semi-submersible drilling vessel, etc.).

In addition, hereinafter, the front-rear direction means a direction parallel to the longitudinal direction of the hull 10, and the left-right direction may mean a direction parallel to the left-right direction of the hull 10.

1 and 2 are side cross-sectional views of a drillship according to an embodiment of the present invention, FIG. 3 is a front cross-sectional view of A-A' in FIG. 1, and FIG. 4 is a front cross-sectional view of B-B' in FIG. 5 is a front cross-sectional view of C-C' in FIG. 1, and FIG. 6 is a front cross-sectional view of D-D' in FIG. 2. Here, FIG. 1 is a side cross-sectional view at the port or starboard side, and FIG. 2 is a side cross-sectional view at the center.

In addition, Figure 7 is a plan view of the drillship according to an embodiment of the present invention, Figure 8 is a plan cross-sectional view of E-E' in Figure 1, Figure 9 is a plan cross-sectional view of F-F' in Figure 1, Figure 10 is a plan cross-sectional view of G-G' in FIG. 1.

In addition, Figure 11 is a view showing the flow of mud in the drillship according to an embodiment of the present invention, Figure 12 is a view showing a skid cart of the drillship according to an embodiment of the present invention, Figure 13 is an embodiment of the present invention It is a diagram showing the fluid flow in the drillship according to.

1 to 13, a drillship 1 according to an embodiment of the present invention includes a hull 10, a drilling system 20, a transfer system 30, a drill assist system 40, a mud system ( 50), and the power system 60.

The hull 10 forms the overall shape of the drillship 1. Hereinafter, for convenience, the hull 10 will be described by limiting that the drillship 1 of the present invention has the shape of a ship.

The hull 10 may be divided into a bow 11, a central portion 12, and a stern 13 in the front and rear direction. The bow 11 is forward based on the direction in which the drillship 1 sails, and the spherical bow may protrude. A cabin 111 having a certain height may be provided in the player 11.

The central part 12 is a space between the bow 11 and the stern 13 for drilling work. Therefore, a moonpool 18 is formed in the central part 12 and various equipments may be placed. There is a possibility that explosive gas may be introduced into the moonpool 18 from an oil well, and the moonpool 18 may be surrounded by a cofferdam 181 to protect the surroundings of the moonpool 18.

In addition, a drilling pipe (P) and a riser (R) may be loaded on the central part 12. Of course, the loading of the drilling pipe (P) and the riser (R), etc., if possible in space, the bow 11 and/or the stern 13 may also be loaded.

The stern 13 is rear based on the direction in which the drillship 1 navigates, and an engine room 61 accommodating the engine 611 may be disposed. In the case where the drillship 1 is propelled using one propeller, the rudder may be installed on the stern 13, but the drillship 1 of this embodiment has a plurality of thrusters (symbols shown) on the bow 11 and the stern 13 Not), it is possible to steer without a rudder.

Since the engine 611 is provided at the stern 13, an engine casing 62 for discharging the exhaust of the engine 611 to the outside may be provided. The arrangement of the engine casing 62 will be described in detail below.

Looking at the front cross-section of the hull 10, the hull 10 may have a substantially rectangular shape consisting of a deck, a side outer plate 16, and a bottom plate 17. At this time, the deck may be a panel deck 14a, a catwalk deck 14b, a drill floor 14c, a main deck 15, a sunken deck 19, and the like.

The panel deck 14a is provided before and after the central portion 12, the bow 11 and the stern 13, etc., and is exposed to the top to support various equipment. Various equipment supported by the panel deck 14a is equipment necessary for drilling, but is not particularly limited, and further, the panel deck 14a may support structures such as the engine casing 62 in addition to the equipment, and the panel deck 14a ) (In particular, a well test area 142 may be formed in the panel deck 14a located at the stern 13). The well test area 142 means a work space for testing and inspecting an oil well. At this time, the well test area 142 may be provided with a crane unit 43 that moves in the front-rear direction.

In the present specification, it is noted that the panel deck 14a is generally used in the drillship 1 and is a panel deck 14a sufficiently understood by those skilled in the art.

The catwalk deck 14b is a deck on which the catwalk 31 for transporting the drilling pipe P is provided. The catwalk deck 14b is a space that implements horizontal movement of the drilling pipe P during drilling, and may be located in the central part 12. Of course, the catwalk 31 provided on the catwalk deck 14b may be responsible for transporting the riser R in addition to the drilling pipe P.

The drill floor 14c is a deck in which a tower 21 for lowering the drilling pipe P and the riser R is provided and drilling work is performed. The drill floor 14c is a space for performing a drilling operation, and may be formed around the moonpool 18. The drill floor 14c may be provided with a cabin 25, which is a control room for integrally controlling drilling, and an MPD zone 141 for installing the drill pressure control unit 55 may be provided in the vicinity of the cabin 25. .

In this embodiment, a catwalk deck 14b may be provided before and after the drill floor 14c. At this time, the catwalk 31 may be provided in front and/or rear of the tower 21 placed on the drill floor 14c. In addition, in this embodiment, the panel deck 14a may be provided on the bow 11 and the stern 13, respectively. That is, the deck of this embodiment may be placed as follows along the longitudinal direction of the hull 10.

Panel deck (14a)-Cat work deck (14b)-Drill floor (14c)-Cat work deck (14b)-Panel deck (14a)

During drilling, the drilling pipe (P) loaded on the panel deck (14a), etc. is transferred to the catwalk (31) of the catwalk deck (14b).In the case of a general drillship, the height difference between the panel deck (14a) and the catwalk deck (14b) As is present, the vertical movement of the drilling pipe (P) is made.

Thereafter, the drilling pipe (P) is transferred to the drill floor (14c).Since there is a height difference in the general drillship between the catwork deck (14b) and the drill floor (14c), transport considering the height difference when transmitting the drilling pipe (P) is It must be done.

However, in this embodiment, the panel deck 14a, the catwalk deck 14b, and the drill floor 14c may be provided side by side on the same height. At this time, the panel deck 14a, the catwalk deck 14b, and the drill floor 14c positioned at the same height may integrally form a flush deck 14.

The flush deck 14 is a deck having a horizontal surface without being intermediate. Therefore, if the drilling pipe (P) is loaded on the upper surface of the panel deck (14a), when the drilling pipe (P) is transferred to the catwalk (31) of the catwalk deck (14b) can be (almost) omitted.

In addition, since the panel deck 14a to the drill floor 14c through the catwalk deck 14b is formed at the same height, it is very convenient for sailors and workers to move. Sailors do not need to use stairs when moving from the panel deck 14a at the bow 11 or the stern 13 to the drill floor 14c where the moonpool 18 is provided, so they can move to and from the work space in a short time. In addition, since the use of stairs is reduced, the present embodiment can prevent the occurrence of safety accidents.

In addition, although it will be described later, as the drill floor 14c and the catwalk deck 14b before and after it are provided at the same height, the present embodiment shows the drilling pipe P from the front to the rear or from the rear to the front of the drill floor 14c. Horizontal transfer is possible.

The flush deck 14 may be loaded with a drilling pipe (P) on the top. That is, the drilling pipe (P) may be exposed to the outside as it is placed on the top of the flush deck 14 and loaded. Of course, when a structure surrounding the drilling pipe P is installed on the flush deck 14, the drilling pipe P can be protected from the outside.

The flush deck 14 may be loaded with a riser R below it. In particular, the riser (R) may be loaded under the catwalk deck (14b) or the panel deck (14a). That is, in this embodiment, the drilling pipe P is loaded on the top (the upper surface of the hull 10) based on the flush deck 14 and the riser R can be loaded on the bottom (the inside of the hull 10). , This is to prevent the hull 10 from tilting when lowering all the risers R to the oil well.

The arrangement of the cabin 111, the tower 21, the engine 611, the riser R, and the drilling pipe P, which are configurations having a relatively large weight in the hull 10, are as follows. The cabin 111 is from the bow 11 to the top of the flush deck 14, the tower 21 is from the center 12 to the top of the flush deck 14, and the engine 611 is from the stern 13 to the flush deck 14 ), the riser (R) is disposed on the top of the flush deck 14 from the bow 11 to the bottom of the flush deck 14, and the drilling pipe (P) is before and after the tower 21.

At this time, when the risers R loaded inside the hull 10 are all lowered to the seabed, the center of gravity moves and the hull 10 tilts. However, since the cabin 111 and the drilling pipe P are provided in front of the tower 21 in addition to the riser R, ballasting of the trim can be stably performed.

The main deck 15 is provided under the flush deck 14 and supports the tower 21. The main deck 15 is a deck supporting the lower part of the tower 21, and in this specification, the main deck 15 is the main deck 15, which is a term commonly used in the drillship 1, like the panel deck 14a. Note that it is the same configuration as

The main deck 15 may be supported by a support structure 22 provided at the lower end of the tower 21, and in the vicinity of the moonpool 18, the upper part of the main deck 15 is in surface contact with the support structure 22 A reinforcing material 182 for supporting the tower 21 may be provided.

The sunken deck 19 is provided on the stern 13 and the mooring device 191 is located. The mooring device 191 means all devices necessary for mooring the drillship 1 such as a winch. The position of the drillship 1 is controlled by a thruster at sea during drilling, but the mooring device 191 may be used when necessary, such as a port berth.

In a conventional drillship, the sunken deck 19 is exposed from the stern 13 to the outside. This is because the mooring wire of the mooring device 191 must extend outside. In addition, in the conventional drillship, the sunken deck 19 has a relatively low height compared to other decks exposed to the outside, so the upper surface of the drillship is in the form of steps from the stern 13 (at the front end of the sunken deck 19). It forms a step.

However, unlike this embodiment, the panel deck 14a provided on the stern 13 may extend to the top of the sunken deck 19. That is, the panel deck 14a becomes a roof covering the sunken deck 19. The sunken deck 19 is provided at a lower position than the flush deck 14, but since the panel deck 14a covers the upper portion of the sunken deck 19, the upper surface of the drillship 1 has a step difference from the stern 13. Can be done without.

Accordingly, in this embodiment, the panel deck 14a is extended to the top of the sunken deck 19 compared to the conventional drillship, so that the area of the panel deck 14a can be sufficiently secured, and the upper surface of the panel deck 14a is It is possible to increase the area of the well test area 142 provided. At this time, at least a portion of the well test area 142 may be located above the sunken deck 19.

The panel deck 14a and the sunken deck 19 may be vertically connected by a side shell plate 16 provided on the left and right sides, and an opening 192 is provided in the side shell plate 16. The mooring device 191 disposed on the sunken deck 19 must extend the mooring wire toward the berthing facility such as land. However, since the upper part of the sunken deck 19 is covered by the panel deck 14a and the left and right sides are surrounded by the ship side outer plate 16, the mooring wire may not be able to escape to the outside. Accordingly, the ship side shell plate 16 of the present embodiment may have at least one opening 192 for penetrating the mooring wire, and the opening 192 may externally connect the mooring device 191 located on the sunken deck 19. Exposed to.

When the side shell plate 16 becomes a column shape by the opening 192, the sunken deck 19 may look like a fatigue structure. Of course, it is possible to completely omit the ship-side outer plate 16 between the sunken deck 19 and the panel deck 14a and place a column (not shown) to support the panel deck 14a.

An opening 161 for discharging the high-pressure gas of the tensioner device 42 to the outside is formed in the ship side shell plate 16 connected to the drill floor 14c of the deck, not an opening 192 for penetrating the mooring wire. Can be. This will be described later.

The sunken deck 19 is a space that implements mooring for the mooring devices 191, and in order to use non-explosion-proof mooring equipment, it is preferable to make it a safe area. Therefore, the sunken deck 19 can be separated without communicating with the danger zone.

Further, the sunken deck 19 may be shifted from the engine casing 62 in the front-rear direction. The engine casing 62 is provided on the panel deck 14a to discharge the exhaust of the engine 611 to the outside. When at least a part of the engine casing 62 is located above the sunken deck 19, an exhaust pipe ( (Not shown), etc. may invade the space of the sunken deck 19. Accordingly, in this embodiment, the engine casing 62 may be provided on the panel deck 14a so as to deviate from the sunken deck 19 in the front-rear direction.

The drilling system 20 implements drilling. The drilling system 20 includes a tower 21, a main well 23, an auxiliary well 24, a cabin 25, and the like.

The tower 21 lowers the drilling pipe P and the riser R. The tower 21 is a configuration in which a drilling pipe (P) or riser (R) is erected in a vertical direction and then descends to the seabed through the main well 23 or the auxiliary well 24, and has a shape such as a derrick. I can.

The tower 21 may be provided with a top drive 211, the top drive 211 may lower the drilling pipe (P) or the like while fixing the top of the drilling pipe (P) or riser (R). The top drive 211 may be located relatively above the tower 21.

In the tower 21 or around the tower 21, a pipe holder (not shown) in which the drilling pipe P is erected and stored may be provided. The pipe storage stand may be a finger board or the like, and may store a temporary assembly of 2 to 3 drilling pipes P.

A support structure 22 (sub structure) is provided at the bottom of the tower 21. The support structure 22 has a shape in which the area is expanded from the bottom of the tower 21 and is coupled to the main deck 15 of the hull 10.

The support structure 22 is provided in a box shape and may be supported by the hull 10 in surface contact. The supporting structure 22 is composed of a frame 221 and a pedestal 222 supporting the tower 21, the frame 221 may be in the form of a box, and the pedestal 222 protrudes below the frame 221 It can be brought into contact with the main deck 15 of the hull 10.

The pedestal 222 may be provided on both sides of the lower end of the frame 221 when viewed from the front cross-section, and may have a form in which the cross-sectional area decreases from the lower end of the frame 221 to the lower side, and the inner surfaces facing each other are partially arcuate. Can be As a result, the lower end of the frame 221 may generate a strong supporting force as an arch is formed by a pair of pedestal 222.

The conventional drillship uses a truss structure to support the tower 21. That is, it is possible to add a reinforcement material in a diagonal direction from the bottom of the tower 21 to the hull 10. At this time, the reinforcement-padded tower 21 is supported while four points of the front and rear left and right are fixed to the deck of the hull 10.

However, in the conventional drillship, as the connection portion between the tower 21 and the hull 10 is provided in a point shape, sufficient reinforcement must be made in the portion of the hull 10 to which the tower 21 is supported. Therefore, the thickness of the member becomes thicker, the spacing of the reinforcing materials decreases, or the number of reinforcements increases.

In contrast, this embodiment uses a support structure 22 that provides a pedestal 222 under the box-shaped frame 221, but the pedestal 222 faces the main deck 15 of the hull 10. By making contact, the weight of the tower 21 can be distributed and supported.

However, a reinforcing material 182 may be provided on the main deck 15 on which the pedestal 222 is supported, and the reinforcing material 182 may be provided around the moonpool 18 in the hull 10. The reinforcing member 182 may support the support structure 22 by having an upper surface in contact with the lower surface of the pedestal 222, and the upper surface cross-sectional area of the reinforcement member 182 may be relatively smaller than the lower surface cross-sectional area of the pedestal 222. At this time, the upper surface of the reinforcing material 182 may evenly contact the lower surface of the pedestal 222.

Since the reinforcing material 182 is a structure for distributing the load by making surface contact with the pedestal 222, when compared with the conventional drillship in which the tower 21 is in point contact with the hull 10, this embodiment is the main deck 15 Even if the reinforcing material 182 is placed in the reinforcing material 182, the number or thickness of the reinforcing material 182 may be significantly reduced compared to the reinforcement material used in a conventional drillship. Therefore, this embodiment can stably support the tower 21 based on a simple structure.

The main well 23 is provided on one side of the tower 21 in the front-rear direction of the hull 10. The main well 23 may be provided behind the tower 21. In the case of the main well 23, it is preferable for the safety of the cabin 111 to be far away from the cabin 111 because drilling by the drilling pipe P is directly performed along with the descending and assembly of the drilling pipe P. . Therefore, the main well 23 may be provided on the opposite side of the cabin 111 based on the tower 21. In this embodiment, since the cabin 111 is provided on the bow 11, the main well 23 is provided at the rear of the tower 21.

The stern 13 is provided with an engine 611 that generates electric power, and the main well 23 may be located between the tower 21 and the engine 611. That is, based on the tower 21, all dangerous parts such as the engine 611 or the main well 23 may be disposed on the opposite side of the cabin 111.

In the main well 23, the drilling pipe P, which has been temporarily assembled and stored in the pipe holder, is assembled and lowered, and the drilling pipe P is lowered into the inside of the pre-installed riser R. However, when the riser R is lowered and assembled from the auxiliary well 24, temporary assembly of the drilling pipe P may be performed in the main well 23.

The auxiliary well 24 is provided on the other side of the tower 21 in the front-rear direction of the hull 10. The auxiliary well 24 may be provided in front of the tower 21 as opposed to the main well 23. The auxiliary well 24 is a space in which the riser R is assembled or the drilling pipe P is temporarily assembled, so it is not connected to the drilled oil well.

Therefore, since the auxiliary well 24 is a safe part compared to the main well 23 directly connected to the drilled oil well, it may be provided on the side of the cabin 111 based on the tower 21. That is, the auxiliary well 24 is provided between the tower 21 and the cabin 111.

Hereinafter, operations in the main well 23 and the auxiliary well 24 will be described. However, in the operation described below, the installation of the drilling and ejection prevention device 555 that is performed before the installation of the ejection prevention device 555 will be omitted.

First, the riser R loaded inside the hull 10 is transferred to the auxiliary well 24 through the catwalk 31. At this time, the auxiliary well 24 may be lowered toward the sea floor while assembling after erecting the riser R. Of course, a jet prevention device 555 may be connected to the lower end of the riser R.

During the operation of lowering the riser R in the auxiliary well 24, the drilling pipe P may be temporarily assembled in the main well 23. That is, the drilling pipe (P) loaded on the upper surface of the hull (10) is transferred to the main well (23) using the catwalk (31), and provisional assembly of 2 to 3 drilling pipes (P) is performed in the main well (23). Done. At this time, the temporarily assembled drilling pipe (P) may be stored in the pipe holder.

When the riser (R) is sufficiently assembled and lowered in the auxiliary well (24), the riser (R) is moved to the main well (23). Thereafter, the riser R may be installed in the oil well in the main well 23, and the drilling pipe P may be temporarily assembled in the auxiliary well 24 at the same time.

At this time, a rotary core 46 is installed in the auxiliary well 24 to aid in temporary assembly of the drilling pipe P. Of course, the temporary assembly of the drilling pipe (P) may be assisted by the mouth hole 46 together with or in place of the rotary drum 46.

The drilling pipe P temporarily assembled in the auxiliary well 24 is stored in the pipe holder, in which case the pipe holder has the same configuration as the configuration for storing the drilling pipe P temporarily assembled in the main well 23, or the tower ( It may be a separate configuration separately provided before and after 21).

After the riser (R) is installed in the oil well, the lowering and assembly of the drilling pipe (P) that was temporarily assembled in the main well (23). First, the drilling pipe P temporarily assembled in the main well 23 is used, and then the drilling pipe P temporarily assembled in the auxiliary well 24 may be transferred to the main well 23 and used. To this end, the pipe holder for storing the drilling pipe P temporarily assembled in the main well 23 and the drilling pipe P temporarily assembled in the auxiliary well 24 prevents the descent of the drilling pipe P from the main well 23. For this purpose, the components provided in the tower 21 are provided in an accessible position.

When both the descending and assembly of the drilling pipe P in the main well 23 is completed, drilling is performed by a drill bit (not shown) connected to the bottom of the drilling pipe P, and the drilling pipe P Mud is supplied to the inside. At this time, the mud is recovered to the main well 23 along the inside of the riser R together with gas ejected from the oil well.

That is, the main well 23 is a dangerous space in which explosive gas leaking out of the oil well is generated while being directly connected to the oil well. In this embodiment, the main well 23 is located on the opposite side of the cabin 111 based on the tower 21. Can be located.

The cabin 25 is provided on one side of the tower 21 and controls the drilling operation. The cabin 25 is a control room that controls the above drilling as a whole, and may be provided on the drill floor. That is, the cabin 25 is provided on the upper surface of the hull 10.

The cabin 25 may be configured such as a control room and a general control room. However, the cabin 25 is responsible for the drilling operation of the drillship 1, and the operation control of the drillship 1 can be performed in the cabin 111.

An MPD zone 141 is provided on one side far from the tower 21 from the cabin 25 (for example, the rear of the cabin 25), and the MPD zone 141 has a drill pressure for controlling the pressure of the oil well during drilling. The control unit 55 may be installed. However, the drill pressure control unit 55 may be provided in the MPD area 141, or the drillship 1 is retrofitted according to the request of the ship owner after the construction and delivery of the drillship 1, and the MPD area 141 ) Can be accommodated. That is, the MPD area 141 may be an empty space prepared for installation of the drill pressure control unit 55.

Since the cabin 25 is in charge of the drilling operation, the drill pressure control unit 55 for controlling the pressure during drilling can also be controlled in the cabin 25. At this time, there are many cases where the drilling worker must operate the drill pressure control unit 55 while working in the cabin 25. In this embodiment, the MPD area 141 for accommodating the drill pressure control unit 55 on one side of the cabin 25 ), it is possible to secure the convenience of the operator.

In particular, in this embodiment, since both the MPD area 141 and the cabin 25 are provided on the flush deck 14 (drill floor 14c) having a constant height, the operator can use the MPD area 141 and the cabin 25 Since it is not necessary to use stairs or the like when going back and forth, the effect of increasing work efficiency and preventing safety accidents can be secured.

The conveying system 30 conveys the drilling pipe P and the riser R. The conveying system 30 includes a catwalk 31 and a pipe conveying section 32.

The catwalk 31 is provided on the catwalk deck 14b and may be located at the center of the hull 10 in the left and right directions. In addition, the catwalk 31 may horizontally move in a direction adjacent to or away from the tower 21.

The catwalk 31 is responsible for conveying the drilling pipe P or riser R. The catwalk 31 may be provided before and after the tower 21, respectively, and the catwalk 31 provided in front of the tower 21 includes a riser (R) and a drilling pipe (P) loaded on the bow (11). It is transferred to the tower 21, and the catwalk 31 provided at the rear of the tower 21 transfers the drilling pipe P loaded on the stern 13 to the tower 21.

Since the cross-sectional areas of the drilling pipe P and the riser R are different, the catwalk 31 may have a cross-sectional shape corresponding thereto. That is, the catwalk 31 may be provided with a partially depressed portion so that a drilling pipe P having a relatively small cross-sectional area is seated while having a semicircle or arc shape in which the riser R is seated.

The drilling pipe (P) or riser (R) transferred by the catwalk (31) may be erected by the top drive (211) of the tower (21), and then erected in the main well (23) or the auxiliary well (24). It can be lowered, assembled or provisionally assembled.

The pipe conveying part 32 conveys the drilling pipe P. The pipe transfer unit 32 may transfer the drilling pipe P between one side and the other side of the tower 21 in the front and rear direction of the hull 10. The pipe conveying part 32 is provided on the left and/or right of the tower 21.

The pipe conveying unit 32 includes a rail 321 and a cart 322. The rail 321 may be provided on the catwalk deck 14b on which the catwalk 31 is placed and the drill floor 14c in which the drilling operation is performed, and may have a length extending in the front-rear direction from the trill floor.

The cart 322 is provided to be movable along the rail 321. The cart 322 moves along the rail 321 while supporting the drilling pipe P laid down similarly to the catwalk 31 to implement the transport of the drilling pipe P.

In this embodiment, various cranes (not shown) may be provided around the pipe transfer unit 32 in order to lower the drilling pipe P loaded on the hull 10 on the cart 322. At this time, the crane may be of various types such as a knuckle boom crane.

Since the pipe transfer unit 32 transfers the drilling pipe P before and after the tower 21, the present embodiment can maximize the work efficiency while loading the drilling pipe P before and after the tower 21.

Specifically, since the main well 23 is provided at the rear of the tower 21, temporary assembly of the drilling pipe P loaded at the rear of the tower 21 is possible. The drilling pipe P loaded in front can also be transferred to the main well 23 so that it can be used in the main well 23. This is also the case in reverse. That is, as the drilling pipe P loaded on the opposite side of the main well 23 or on the opposite side of the auxiliary well 24 based on the tower 21 is transferred to the opposite side of the tower 21 by the pipe transfer unit 32 It can be used in the main well 23 or the auxiliary well 24.

In the end, the drilling pipe (P), regardless of where it is loaded with respect to the tower (21), will be used both in the auxiliary well (24) located in front of the tower (21) or the main well (23) located in the rear. I can.

In addition, if the pipe transfer unit 32 is used, after all the risers R loaded in front of the tower 21 are transferred to the seabed, the drilling pipe P loaded in front of the tower 21 is also at least partially When temporarily assembled and stored in the pipe holder of the tower 21, the remaining drilling pipes (P) are transferred to the front of the tower 21 to stabilize the trim of the drillship (1).

The pipe transfer unit 32 may be provided on the left side and/or the right side of the tower 21. Therefore, at least two or more drilling pipes (P) can be simultaneously transferred to the front and rear of the tower (21).

As described above, in this embodiment, while the main well 23 and the auxiliary well 24 are provided before and after the tower 21, the drilling pipe P is moved to the front and rear of the tower 21 by using the pipe transfer unit 32. As can be, the loading method of the drilling pipe (P) can be expanded in more various ways.

The drill assist system 40 assists drilling. The drill assist system 40 is a configuration used during or before drilling. The riser tensioner 41, the tensioner equipment 42, the crane part 43, the burner boom 44, the skid It includes a cart 45, a mouth hole 46, a rotary drum 46, and a telescopic joint 47.

The riser tensioner 41 applies tension to the riser R. The riser tensioner 41 applies tension to the riser R connected from the hull 10 to the seabed, thereby stably supporting the riser R and preventing buckling from occurring in the riser R.

The riser tensioner 41 may include a plurality of cylinders (not shown) and a corresponding piston (not shown), and the tension applied to the riser R by the contraction or tension movement of the piston is adjusted. Can be. At this time, the movement of the piston is implemented by the hydraulic oil filled in the cylinder, and the delivery of the hydraulic oil may be controlled by the tensioner device 42.

The riser tensioner 41 may be provided under the drill floor 14c. In a conventional drillship, the riser tensioner 41 is generally provided on the drill floor 14c and exposed to the outside. However, in this case, the riser tensioner 41 may fail due to seawater or sea wind applied to the riser tensioner 41, and frequent maintenance is inevitably required.

Accordingly, in this embodiment, the riser tensioner 41 may be provided inside the hull 10 that is under the drill floor 14c. At this time, the riser tensioner 41 may be accommodated in a tensioner room 411 provided on the left and right sides from the rear of the moonpool 18.

The tensioner room 411 may be located inside the ship side outer plate 16 and above the ship bottom plate 17. That is, the tensioner room 411 can be located inside the hull 10 without contacting the outside, and the riser tensioner 41 can be protected not only from seawater or sea breeze, but also from external shocks.

The tensioner room 411 may be formed long in the contraction/tension direction of the riser tensioner 41, and since the contraction/tension of the riser tensioner 41 is made in the vertical direction, the tensioner room 411 has a large height in the vertical direction. You can have space. At this time, the riser tensioner 41 may be provided in a state spaced apart from the lower surface of the tensioner room 411, and the riser tensioner 41 is tensioned in a direction closer to the lower surface of the tensioner room 411, or the tensioner room 411 It can contract in a direction away from the underside of the.

However, the tensioner room 411 may communicate with the moonpool 18 due to a wire used for the riser tensioner 41 or the like. The moonpool 18 is a space in which explosive gas generated from an oil well can be introduced and corresponds to a danger zone, and the tensioner room 411 may belong to a danger zone as it communicates with the moonpool 18. In this case, the riser There is a problem that the tensioner 41 and related equipment must be provided with explosion protection.

However, in this embodiment, the inside of the tensioner room 411 is at a positive pressure, so that the gas introduced into the moonpool 18 does not flow into the tensioner room 411, thereby making the tensioner room 411 a safe zone. . To this end, a pressure regulating device 412 is provided in the tensioner room 411.

The pressure regulating device 412 may suck air from the outside to make the inside of the tensioner room 411 a positive pressure state. At this time, the pressure regulating device 412 may suck air from the safety zone, and, for example, may suck air from the left and right outside of the hull 10 and supply it into the tensioner room 411.

By the operation of the pressure regulating device 412, the tensioner room 411 has a positive pressure compared to other spaces, so even if an explosive gas is generated from the moonpool 18, it does not flow into the tensioner room 411. Therefore, the tensioner room 411 may be a safety zone, and accordingly, even if the riser tensioner 41 is non-explosion-proof, there may be no problem.

The tensioner device 42 regulates the pressure oil flow of the riser tensioner 41. At this time, the tensioner device 42 generates high-pressure gas (which may be high-pressure air or high-pressure nitrogen) to push the pressure oil with the high-pressure gas so that the pressure oil is transferred to the riser tensioner 41, so that the flow of the pressure oil of the riser tensioner 41 Can be controlled.

The tensioner equipment 42 may be provided outside the tensioner room 411 and may be surrounded by the side shell 16. At this time, an opening 161 that is open to the outside is provided in the side shell plate 16 so that the high-pressure gas used in the tensioner device 42 leaks out to the outside.

The opening 161 provided in the ship side outer plate 16 may be located under the drill floor 14c, but may be located above the load line. The load line may mean the water line during drilling, and if the opening 161 is below the water line, there is a possibility that seawater may flow into the tensioner equipment 42 and the tensioner room 411 through the opening 161. , The opening 161 may be positioned higher than the load line by a predetermined height.

The opening 161 may be located on the left and right sides of the moonpool 18, and gas generated from the moonpool 18 as well as the high-pressure gas of the tensioner device 42 may be discharged through the opening 161. This is because the space in which the tensioner device 42 is placed can communicate with the moonpool 18.

The crane part 43 is provided in the well test area 142 located at the stern 13, and includes a leg part 431, a rail part 432, and an overhead crane 433. A plurality of leg portions 431 are disposed in a front-rear direction from left to right of the well test zone 142. The leg portion 431 may serve as a pillar supporting the rail portion 432 above the flush deck 14.

The rail part 432 connects the leg part 431 in the front-rear direction. The rail part 432 may be provided in a pair, and may connect the leg parts 431 provided on the port side of the hull 10 or the bridge parts 431 provided on the starboard side of the hull 10. .

The rail part 432 may extend from the rear end of the stern 13 to the front of the well test area 142, and may extend to the moonpool 18 for a long time. Of course, in order to extend the rail part 432, the leg part 431 is arranged to a position adjacent to the moonpool 18 of course.

The structure of the rail part 432 or the leg part 431 may be reinforced by an engine casing 62 to be described later. The engine casing 62 may be provided on the left and right sides of the well test area 142, and the leg part 431 and the rail part 432 are provided in the well test area 142, the leg part 431 or the rail part ( The 432 is provided inside the engine casing 62 (from the engine casing 62 to the center of the hull 10) and may be connected to the engine casing 62 for reinforcement.

The rail part 432 and the leg part 431 may be connected to the engine casing 62 by a reinforcing part 434 protruding from the inner surface of the engine casing 62, and at this time, the structure of the reinforcing part 434 Not limited. The reinforcing part 434 may be a wire or may be a rigid structure.

In this embodiment, since the rail part 432 and the leg part 431 are structurally connected to the engine casing 62 through the reinforcement part 434, the rail part 432 can be sufficiently prevented from shaking in the left and right directions. . In this case, the safety of work by the crane part 43 is improved.

In addition, at the same time, even if at least a portion of the engine casing 62 protrudes to the outside of the ship side outer plate 16, the engine casing 62 is connected to the rail part 432 or the leg part 431 installed in the well test area 142 As long as possible, it can be stably fixed to the hull 10.

The overhead crane 433 has both ends supported by the rail part 432 and moves in the front-rear direction. The overhead crane 433 may cover a range of the well test area 142 or more as the rail part 432 extends from the rear end of the stern 13 to the moonpool 18.

The overhead crane 433 may have a width smaller than or equal to the distance between the engine casings 62 provided on the left and right sides of the well test area 142. Since the rail portions 432 supporting both ends of the overhead crane 433 are located inside the engine casing 62 and supported by the engine casing 62, the width of the overhead crane 433 is the engine casing 62 ) Can be limited to the width between.

In this embodiment, as the crane unit 43 is used instead of a crane that is rotatably fixed to a certain point such as a knuckle boom crane, it is possible to increase work efficiency while minimizing interference during work.

In addition, this embodiment has an overhead crane 433 that moves along the rail portion 432 supported by the leg portion 431 instead of using a gantry crane, so the structure of the flush deck 14 Can not be changed.

If a gantry crane is to be used, rails must be installed on the deck. If the rail protrudes upward from the deck, the rail causes inconvenience to the movement of workers. Conversely, if the rail is provided to be recessed in the deck, the lower part of the deck As the furnace rail protrudes, there is a problem that a dead space is generated under the deck.

However, in this embodiment, since the leg portion 431 is installed on the upper surface of the flush deck 14 and the rail portion 432 is fixed by floating above the flush deck 14, the operator can conveniently mount the flush deck 14 It is possible to prevent the occurrence of a space that can be moved and discarded under the flush deck 14.

The burner boom 44 is rotatably provided on the stern 13 and burns inflammable substances discharged from the oil well. The burner boom 44 is provided adjacent to the well test area 142, one end is rotatably provided at the stern 13, and the other end discharges exhaust gas burning flammable substances.

When the burner boom 44 rotates, the other end of the burner boom 44 may be placed in the well test area 142. The other end of the burner boom 44 may have to be located in the well test area 142 for maintenance or the like. At this time, in this embodiment, the burner boom 44 may be rotated so that the other end is positioned within the well test area 142.

A plurality of burner booms 44 may be provided on the stern 13, and may be provided on the left and right sides of the stern 13, respectively. However, the plurality of burner booms 44 may have different heights to prevent interference during rotation.

In order for the burner boom 44 to rotate inside the stern 13, there should be no structures or obstacles on the rotation path of the burner boom 44. However, in this embodiment, as the engine casing 62 is provided on the left and right of the well test area 142 in the hull 10, the burner boom 44 can be rotated inside the stern 13 without any problem.

That is, in this embodiment, by arranging the engine casing 62 on the left and right of the well test zone 142 in the stern 13, the other end of the burner boom 44 when the burner boom 44 installed on the stern 13 rotates. The engine casing 62 does not interfere when entering the well test area 142.

The skid cart 45 is provided so as to be movable before and after the moonpool 18. For the movement of the skid cart 45, rails 451 may be installed in the front and rear directions of the hull 10 on the moonpool 18 and the skid cart 45 may move along the rails 451.

The skid cart 45 grips the riser R. The skid cart 45 may be transferred to the main well 23 by moving rearward while holding the riser R assembled and lowered in the auxiliary well 24. Accordingly, the main well 23 may receive the riser R and assemble and lower the drilling pipe P into the riser R.

The skid cart 45 transfers the riser R (and the ejection prevention device 555) from the auxiliary well 24 to the main well 23. If the skid cart 45 fails, the riser R If delivery is not made, there is a concern that the drilling operation itself may be delayed.

Therefore, in this embodiment, in order to prevent this, a plurality of skid carts 45 may be provided on the rail 451 in the front and rear direction of the hull 10, and the skid carts 45 are provided to be backed up to each other.

The rail 451 forming the movement path of the skid cart 45 has a length extending in the front-rear direction so that at least a portion thereof corresponds to the main well 23 and the auxiliary well 24, for example, the main well 23 It may have a length greater than the distance between the auxiliary well 24 (a length greater than the front and rear width of the moonpool 18).

Specifically, the rail 451 has one end extending further away from the auxiliary well 24 (rear) from the main well 23 and the other end extending away from the main well 23 from the auxiliary well 24 (front) It has a length that extends further.

At this time, the rail 451 may have a length between the main well 23 and one end greater than or equal to the front and rear width of the skid cart 45, and the length between the auxiliary well 24 and the other end is the front and rear width of the skid cart 45 It can be more than that.

Therefore, when a problem occurs in any one of the plurality of skid carts 45, one of the skid carts 45 is removed from the rail 451 to one end or the other end, and the other skid cart ( 45) moves along the rail 451 to perform the task.

At this time, even if one of the skid cart 45 is removed to one end or the other end of the rail 451, the other skid cart 45 moves between the main well 23 and the auxiliary well 24 to perform work without problems. In order to be able to do so, one end and the other end of the rail 451 extend further away from the main well 23 and the auxiliary well 24.

For example, if a problem occurs in the skid cart 45 located at the rear of the two skid carts 45, the skid cart 45 at the rear may move to one end of the rail 451 and be positioned to be displaced from the main well 23. I can. Thereafter, the front skid cart 45 replaces the rear skid cart 45 and moves along the rail 451 within the working range including the auxiliary well 24 and the main well 23 to perform work.

On the contrary, if a problem occurs in the front skid cart 45, the front skid cart 45 moves to the other end of the rail 451 and is positioned to be displaced from the auxiliary well 24, and then the rear skid cart 45 It is possible to perform the work by replacing the skid cart 45 in front.

The skid cart 45 may be used to fix the lower portion of the rotary sock or the mouse hole 46 in addition to the transfer of the riser R. Both the rotary drum 46 and the mouth hole 46 are used for provisional assembly of the drilling pipe P, and the rotary drum 46 is directly installed in the auxiliary well 24 and cannot lift the drilling pipe P. It is a configuration (however, the drilling pipe (P) of the rotary shaft (46) can be raised and lowered by the top drive (211)), the mouth hole (46) is installed around the auxiliary well (24) and the drilling pipe (P) It is a configuration that lifts hydraulically.

In the conventional case, the lower portion of the rotary drum 46 or the mouth hole 46 was fixed to the hull 10 by a wire or the like. However, in the present embodiment, it is not necessary to provide a wire fixing structure and the rotary shaft 46 may be fixed using the skid cart 45 so that the wire fixing operation can be omitted.

At this time, the skid cart 45 may fix the lower portion of the rotary inner portion 46 or the lower portion of the mouth hole 46. Therefore, the upper end of the rotary shaft 46 is fixed to the auxiliary well 24 and the lower part is fixed to the skid cart 45, and the mouth hole 46 also has the upper end fixed to the upper end of the hull 10, and the lower part is fixed to the skid cart ( 45), it is possible to stably perform temporary assembly of the drilling pipe (P).

The telescopic joint 47 absorbs the vertical motion of the riser R. The riser (R) installed in the hull (10) is moved up and down due to the heaving motion of the drillship (1). When the riser (R) is rigidly fixed to the hull (10), the heaving motion of the drillship (1) There is a risk that the riser (R) is separated from the hull 10 or damaged.

Accordingly, the telescopic joint 47 has an upper end fixed to the hull 10 and a lower end connected to the riser R, and is provided to absorb the rise and fall of the riser R using a telescopic structure. At this time, the upper end of the telescopic joint 47 may be coupled to the hull 10 through the diverter 54, and the lower end of the telescopic joint 47 is attached to the riser R with the MPD module 551 interposed therebetween. Can be combined.

The mud system 50 supplies mud to the drilling pipe P. Mud supplied to the drilling pipe P by the mud system 50 can be recovered by rising along the inside of the riser R after being discharged from the drill bit. The mud system 50 includes a mud pit 51, a mud pump 52, a mud treatment unit 53, a diverter 54, and a drill pressure control unit 55.

The mud pit 51 stores mud. The mud pit 51 has a mud tank 511 arranged in a plurality of grids therein. At this time, the mud tank 511 may have a cylindrical shape to reduce the area of mud precipitation, and may be linearized on the hull 10. That is, in the interior of the mud pit 51, which is a hexahedral space, the linearized mud tank 511 is provided to serve as a pillar. Therefore, inside the mud pit 51, the reinforcing material 182 may be omitted. This is because the cylindrical mud tank 511 serves as a pillar and a reinforcing member 182.

However, the mud pit 51 may be provided with a reinforcing material 182 only outside when necessary. Of course, if sufficient structural strength is secured by the arrangement of the mud tank 511, the external reinforcing material 182 may also be omitted.

The mud tank 511 has an agitator (not shown) that mixes mud to prevent curing of the mud. The agitator has blades that rotate by a motor, and the mud in the mud tank 511 continuously circulates due to the rotation of the blades, thereby preventing curing.

The agitator may be provided for each of the plurality of mud tanks 511. At this time, the agitator may be driven by receiving power from the low voltage switch board 63 provided on the other side far from the tower 21 in the mud tank 511, and a low voltage cable from the low voltage switch board 63 to each agitator (Not shown) can be connected.

The mud pump 52 pumps mud. The mud pump 52 pumps the mud stored in the mud pit 51 and supplies it to the top drive 211. The top drive 211 supplied with mud may transfer mud into the drilling pipe P.

The mud pump 52 may be provided at one side adjacent to the tower 21 in the mud tank 511. That is, the mud pump 52 is provided in front of the mud tank 511 between the mud tank 511 and the tower 21.

In the conventional drillship, the mud pump 52 is located at a point far from the tower 21 with respect to the mud tank 511. In this case, there is a problem that the mud pipe from the mud pump 52 to the top drive 211 must be provided long, and the load of the mud pump 52 must be sufficiently increased so that there is no problem in flow when the mud with high viscosity is transferred. There is.

However, in this embodiment, as the mud pump 52 is provided on one side adjacent to the tower 21 based on the mud tank 511, the mud pipe that must be provided from the mud pump 52 to the top drive 211 ( (Not shown) can be shortened and the load of the mud pump 52 can be reduced.

However, the mud pump 52 is supplied with power from the high voltage switch board 64, and if the mud pump 52 is provided in front of the mud tank 511, the high voltage switch board 64 to the mud pump 52 It is necessary to connect a high voltage cable (not shown). This increases the length of the high voltage cable as compared to the conventional case.

However, it is sufficient to connect the high voltage cable from the high voltage switch board 64 to the mud pump 52, but the low voltage cable must be connected for each agitator provided separately from the low voltage switch board 63 to the plurality of mud tanks 511. do. That is, in this embodiment, instead of slightly increasing the length of a small number of high voltage cables, the length of a large number of low voltage cables to be installed as many as the number of mud tanks 511 can be reduced, thereby significantly reducing the overall cable length.

The mud treatment unit 53 recycles the mud circulating through the drilling pipe P. The mud treatment unit 53 may filter impurities, etc. from the mud supplied to the oil well through the drilling pipe P and recovered through the riser R. For example, the mud treatment unit 53 may filter out impurities having a large lump by using a structure such as grating while shaking the mud.

The mud treatment unit 53 may transfer the recycled mud to the mud tank 511. In other words, mud can be used continuously. At this time, the mud treatment unit 53 may be provided above the mud pump 52.

When describing the flow of mud in detail, the mud accommodated in the mud tank 511 is first transferred to the top drive 211 by the mud pump 52, and the inside of the drilling pipe P by the top drive 211 Is supplied as

Thereafter, the mud discharged from the drill bit rises inside the riser R by the pressure of the gas discharged from the oil well, and is transferred to the mud treatment part 53 through the inside of the telescopic joint 47 and the diverter 54. .

At this time, the mud treatment unit 53 purifies the mud mixed with impurities and the like, and supplies it to the mud tank 511. In this way, the mud circulates through the mud tank 511, the mud pump 52, the top drive 211, the drilling pipe (P), the riser (R), the diverter 54, and the mud treatment unit 53.

The diverter 54 delivers the mud circulating through the drilling pipe P to the mud treatment unit 53. The diverter 54 may deliver the fluid recovered through the riser R together with the mud, wherein the fluid may include mud and gas ejected from the oil well.

When overpressure occurs in the fluid recovered from the oil well, the diverter 54 discharges the fluid to the outside to protect the mud system 50 and the like. In addition, when an overpressure is detected in the fluid recovered by the riser R, the fluid discharged to the outside through the submarine MPD module 551 provided between the riser R and the diverter 54 is a choke & kill manifold ( After passing through 554, it may be recovered through the diverter 54.

The drill pressure control unit 55 controls the pressure of the oil well during drilling. When drilling the seabed using the drilling pipe (P), external pressure such as water pressure and pressure of gas ejected from an oil well may be generated, thereby destroying the drilled part. Therefore, in general, it is possible to withstand external pressure by installing a casing made of a material such as concrete in the drilled part during drilling.

However, in this embodiment, by appropriately controlling the external pressure generated from the oil well during drilling, the installation of the casing can be reduced. As an example, the drill pressure control unit 55 controls the pressure of a fluid including mud supplied through the drilling pipe P or recirculated gas, so that the drilled part is maintained without collapse by external pressure such as water pressure. I can.

As described above, the drill pressure control unit 55 may be provided in the MPD area 141 during drying of the drillship 1 or retrofit after drying, and the MPD area 141 may be located at one side of the cabin 25. As possible, the worker working in the cabin 25 can easily access the drill pressure control unit 55.

However, the drill pressure control unit 55 includes a submarine MPD module 551, an MPD reel 552, a hull side MPD module 553, a choke & kill manifold 554, a jet prevention device 555, and a BOP reel 556), and only the ship-side MPD module 553 included in the drill pressure control unit 55 may be provided in the MPD area 141.

The subsea MPD module 551 is provided between the riser R and the diverter 54 and discharges the fluid to the outside. The subsea MPD module 551 may be located between the riser R and the telescopic joint 47, and discharge of the fluid according to the pressure of the fluid recovered from the oil well may be realized.

The seafloor MPD module 551 always maintains a state submerged in the seafloor, and may have a configuration serving as a system diagram. That is, the subsea MPD module 551 may allow fluid to be transferred to the diverter 54 or may take out at least a portion of the fluid to the outside without transferring to the diverter 54. At this time, the flow of the fluid by the MPD module 551 on the seabed is controlled by the MPD reel 552.

The MPD reel 552 is provided on the hull 10 and is connected to the subsea MPD module 551 to operate the subsea MPD module 551. When overpressure of the fluid is detected by the subsea MPD module 551 or a separate sensing configuration, the MPD reel 552 operates an opening/closing configuration such as a valve provided in the subsea MPD module 551 so that the fluid diverters ( 54), and can be discharged to the outside.

The MPD reel 552 may be located under the drill floor 14c, may be provided outside the MPD area 141, and may be provided on the main deck 15. However, since the MPD reel 552 must be connected to the subsea MPD module 551, it may be provided around the moonpool 18 where the telescopic joint 47 is installed.

The hull side MPD module 553 is housed in the MPD area 141 and controls the choke & kill manifold 554. The ship-side MPD module 553 serves as a control unit for controlling the pressure of the oil well during drilling, and is provided near the cabin 25 to facilitate operator access.

The ship-side MPD module 553 may have a high-pressure unit that generates pressure for implementing fluid recirculation. In this case, the high pressure may be implemented by a fluid such as gas. The high pressure unit may apply pressure to the fluid recirculated through the diverter 54 to achieve pressure equilibrium in the oil well.

The choke & kill manifold 554 is provided on the hull 10 and receives fluid from the subsea MPD module 551 and circulates it to the diverter 54. When an abnormality in the pressure of the fluid circulating from the oil well is detected, the fluid is transferred to the choke & kill manifold 554 through the subsea MPD module 551 instead of being transferred to the diverter 54. At this time, the choke & kill manifold 554 adjusts the pressure of the fluid and transfers it to the diverter 54 for recirculation.

The choke & kill manifold 554 can be controlled by the MPD module 553 on the hull side. That is, the pressure of the fluid transmitted through the MPD module 551 at the bottom of the sea with an abnormal pressure is converted to an appropriate pressure in the choke & kill manifold 554 controlled by the MPD module 553 on the hull side. ). Therefore, the pressure of the oil well during drilling is generally controlled by the MPD module 553 on the hull side, and can be maintained within a stable range.

The flow of the fluid containing mud will be described again as follows. The mud supplied through the drilling pipe (P) rises along the riser (R) while being mixed with gas in the oil well. When the pressure of the fluid flowing into the riser (R) is within the appropriate pressure range, the fluid is diverted (54). ) Can be continuously circulated through the mud treatment unit 53, the mud tank 511, and the mud pump 52.

However, when the pressure of the fluid is out of the appropriate pressure range, the fluid is discharged to the outside through the submarine MPD module 551 instead of being delivered to the diverter 54 and then supplied to the choke & kill manifold 554.

Thereafter, the fluid is supplied to the diverter 54 after the pressure is adjusted in the choke & kill manifold 554 by the MPD module 553 on the hull side and resupplied to the oil well through the drilling pipe P. Accordingly, the present embodiment allows the fluid transmitted through the drilling pipe P in the oil well to be relatively in equilibrium with external pressure such as water pressure, so that the installation of the casing can be minimized.

The blow out preventer 555 (BOP) is installed on the seabed and a riser R is connected to the top. The ejection prevention device 555 is a device for preventing an explosion from occurring due to gas or crude oil discharged from an oil well, and may be formed of a plurality of valves.

The BOP reel 556 is provided on the hull 10 and is connected to the ejection prevention device 555. The BOP reel 556 may be located under the drill floor 14c in the hull 10, may be provided on the main deck 15 or may be provided under the main deck 15.

The BOP reel 556 may operate the ejection preventing device 555 according to the pressure of the fluid in the ejection preventing device 555. That is, similar to the connection between the MPD reel 552 and the subsea MPD module 551, the BOP reel 556 may be connected to the ejection prevention device 555.

Therefore, the drill pressure control unit 55 can reduce the installation of the casing by realizing real-time pressure equalization at the seabed using the MPD module 551 on the seabed and the MPD module 553 on the hull side, etc., and ejection to prevent explosion By providing the prevention device 555, it is possible to ensure safe drilling.

The power system 60 produces and supplies energy used in the drillship 1. The power system 60 includes an engine room 61, an engine casing 62, a low voltage switch board 63, and a high voltage switch board 64.

The engine room 61 is provided on the stern 13 and accommodates at least one engine 611 therein. At this time, the engine 611 is driven by oil or gas to generate rotational force, and electric power may be generated using a generator (not shown) connected to the rotational shaft of the engine 611.

The electric power generated at this time is used in the drillship 1 to achieve various purposes. For example, power may be transmitted to the thruster for navigation of the drillship (1), it may be transmitted to the top drive 211 or the mud pump 52 for drilling, and for the transport of the drilling pipe (P). It can be delivered to the crane or the catwalk (31). In addition, power may be transmitted to the cabin 111 in which the crew and the worker reside.

The power produced by the engine 611 is a high voltage, and this power is a configuration in which the voltage is appropriately converted through the high voltage switchboard 64 and then the high voltage is used (top drive 211, mud pump 52, etc.) Can be supplied to

The power delivered to the high voltage switch board 64 may be converted to a low voltage through the low voltage switch board 63 and then supplied in a configuration using a low voltage (such as an agitator). That is, the power may be produced through the engine 611 and then supplied to a high voltage consumer via the high voltage switch board 64 or may be supplied to a low voltage consumer via the high voltage switch board 64 and the low voltage switch board 63 in turn. .

The engine casing 62 discharges exhaust from the engine 611 to the outside. The engine casing 62 is located above the engine room 61 and may be provided on the flush deck 14 (panel deck 14a) at the stern 13. A pair of engine casings 62 may be disposed on the left and right sides of the well test area 142, and may be located in front of the rear end of the stern 13 and at the same time in front of the rear end of the well test area 142. At this time, the exhaust discharged from the engine 611 may be appropriately distributed and discharged to the outside through a pair of engine casings 62.

The engine casing 62 may be provided so that at least a portion of the engine casing 62 protrudes outward from the ship side outer plate 16. That is, when the drillship 1 of this embodiment is viewed from the front, the engine casing 62 may protrude further to the left or the right than the side shell plate 16.

However, in order for the engine casing 62 to be stably supported on the upper surface of the hull 10, the portion provided on the inside of the ship side outer plate 16 in the engine casing 62 protrudes to the outside of the ship side outer plate 16 Can be relatively larger.

By arranging the engine casing 62 as described above, in this embodiment, the area of the well test area 142 can be sufficiently secured, and the burner boom 44 rotates inside the well test area 142 without interference. You can do it.

The low-voltage switchboard 63 supplies electric power generated by the engine 611 at a low voltage to a customer. However, the low-voltage switchboard 63 cannot immediately receive the power produced by the engine 611, and may receive the transformed power from the high-voltage switchboard 64, convert it to a low voltage, and transmit it to a consumer.

The low voltage demand destination for which the low voltage switch board 63 supplies low voltage power may be an agitator or the like. The agitator is provided for each mud tank 511, and a low voltage cable is connected from the low voltage switch board 63 to the agitator.

In this embodiment, since the mud tank 511 is provided at the rear of the mud pump 52, the mud tank 511 is a low voltage switch board from the mud tank 511 compared to the conventional drillship provided in front of the mud pump 52 It is possible to shorten the low voltage cable that is connected up to (63). In particular, since the low voltage cable connected from the low voltage switch board 63 to the agitator must be provided for each agitator, the reduction effect of the low voltage cable that can be obtained by changing the arrangement of the mud tank 511 is significant.

The high voltage switchboard 64 supplies electric power generated by the engine 611 at a high voltage to a customer. The high voltage switch board 64 may be a top drive 211, a mud pump 52, or the like as a demand destination for transmitting high voltage power.

When the mud pump 52 is disposed behind the mud tank 511 and the mud tank 511 is disposed behind the mud pump 52, the mud pump 52 from the high voltage switch board 64 The length of the high-voltage cable that is connected to may increase somewhat, but considering that the length of many low-voltage cables is shortened, it can be seen that the overall cable length is significantly reduced.

The high voltage switchboard 64 may deliver high voltage power to a high voltage consumer, or may deliver the low voltage switchboard 63. The power transferred from the high voltage switch board 64 to the low voltage switch board 63 is converted to a low voltage as described above and then supplied to a low voltage consumer.

The high voltage switch board 64 may be provided under the low voltage switch board 63. The high voltage switch board 64 and the engine 611 may be disposed in the front and rear direction and may be provided at the same height, and the high voltage switch board 64 and the low voltage switch board 63 may be disposed vertically. Of course, the arrangement of the high voltage switch board 64 and the low voltage switch board 63 and the engine 611 may be variously made.

As described above, the present embodiment can efficiently improve the structure, arrangement, etc. of the drillship 1 to increase workability and secure safety.

Although the present invention has been described in detail through specific examples, this is for explaining the present invention in detail, and the present invention is not limited thereto, and within the technical scope of the present invention, those of ordinary skill in the art It would be clear that the transformation or improvement is possible.

All simple modifications to changes of the present invention belong to the scope of the present invention, and the specific scope of protection of the present invention will be made clear by the appended claims.

1: Drillship P: Drilling pipe
R: riser
10: hull
11: Player 111: Cabin
12: central part 13: stern
14: flush deck 14a: panel deck
14b: catwalk deck 14c: drill floor
141: MPD zone 142: Well test zone
15: main deck 16: side shell
161: opening 17: bottom plate
18: Moonpool 181: Cofferdam
182: reinforcement 19: sunken deck
191: mooring device 192: opening
20: drilling system
21: tower 211: top drive
22: support structure 221: frame
222: pedestal 23: main well
24: auxiliary well 25: cabin
30: transfer system
31: catwalk 32: pipe transfer unit
321: rail 322: cart
40: drill assist system
41: riser tensioner 411: tensioner room
412: pressure regulator 42: tensioner equipment
43: crane part 431: leg part
432: rail part 433: overhead crane
434: reinforcement part 44: burner boom
45: skid cart 451: rail
46: mouth hole, rotary speed 47: telescopic joint
50: mud system
51: mud pit 511: mud tank
52: mud pump 53: mud treatment unit
54: diverter 55: drill pressure control unit
551: subsea MPD module 552: MPD reel
553: Hull side MPD module 554: Choke & kill manifold
555: jet prevention device 556: BOP reel
60: power system
61: engine compartment 611: engine
62: engine casing 63: low voltage switchboard
64: high voltage switchboard

Claims (6)

In the drillship floating in the ocean and drilling the seabed,
It includes a mud pit that stores mud to be supplied to the drilling pipe,
The mud pit,
In the inside of the mud pit, which is a hexahedral space, a cylindrical mud tank is provided by arranging a plurality of cylindrical members contacting the lower and upper surfaces in a grid,
A reinforcing material is omitted inside the cylindrical member constituting the mud tank, and a reinforcing material is provided only outside of the cylindrical member,
The mud tank,
Drillship, characterized in that provided to serve as a pillar in the interior of the mud pit. delete delete The method of claim 1, wherein the mud tank,
Drillship, characterized in that it has an agitator for mixing the mud to prevent curing of the mud. The method of claim 1,
Drillship further comprising a mud pump for pumping the mud. The method of claim 1,
Drillship further comprising a mud treatment unit for recycling the mud circulating through the drilling pipe.

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