KR20120031405A - Drill ship with auxiliary structure - Google Patents

Abstract

PURPOSE: A drilling ship with an auxiliary structure is provided to reduce the time consumed for completing a well by performing an auxiliary operation related to drilling by installing an auxiliary structure excluding a derrick on the deck of a drilling ship. CONSTITUTION: A drilling ship with an auxiliary structure comprises an auxiliary structure(200), a hoisting device(250), and a fixing device. The auxiliary structure performs an auxiliary operation and a drilling operation simultaneously with or independently of a drilling operation by a derrick. The hoisting device can be moved back and forth, and to the left and right to handle or to lower drilling devices to the sea bottom. The fixing device fixes the movement of the drilling devices, if the drilling devices are lowered to the sea bottom by the hoisting device.

Description

Drill Ship with Auxiliary Structures {Drill Ship with Auxiliary Structure}

The present invention relates to a drilling vessel, and more particularly, drilling and assembling of various pipes for drilling, blow-out preventer (BOP) and christmas tree installation / dismantling operation during the drilling operation at the same time or independently. It is about the structure that can perform the related auxiliary work.

As the international rapid industrialization and industry develop, the use of global resources such as petroleum is gradually increasing, so that stable production and supply of oil is becoming a very important problem at the global level.

For this reason, the development of marginal oilfields and deep-field oil fields, which have been neglected in recent years because of lack of economic efficiency beyond land drilling, have become economic. Therefore, along with the development of seabed mining technology, a drilling vessel equipped with drilling equipment suitable for the development of such an oil field has been developed.

Conventional subsea drilling mainly used a rig ship or a fixed platform dedicated to subsea drilling, which can be sailed only by other tugboats and anchored at one point of the sea using mooring devices. Recently, so-called drill ships, which are manufactured in the same form as general ships so that they can be sailed by their own power and equipped with advanced drilling equipment, have been developed and used for subsea drilling.

In order to drill oil or gas existing in the basement of the seabed in the center of the rig ship, platform, or drilling vessel (hereinafter referred to as a drilling ship) equipped with various drilling equipments to drill oil or gas existing in the basement of the seabed A moonpool is formed so that the riser or drill pipe can be moved up and down.

1 is a view showing a conventional drilling ship performing drilling operation at sea level.

Drilling operations for mining oil or gas resources at sea lift the drilling pipes (such as drill pipes or riser pipes) from the loading deck on the deck floor to the riser handling crane and move them to the catwalk. And then back to the drillfloor above the substructure and then using a derrick to stand down and advance downward through the door pool formed in the center of the drilling rig to keep the reservoir below the sea bed. Drill undersea resources stored in wells located in reservoirs.

The riser 4 provides a passage through which the mud returns as a member that is advanced to the bottom of the sea floor 6 before advancing the drill pipe 5 to the well 13. When the riser 4 is installed, the drill pipe 5 is advanced downwardly through the seabed 11 to the well 13 into the riser.

In this way, when the riser 4 is advanced downward to the bottom of the seabed 6 or the drill pipe is advanced to the well, the riser or the drill pipe of short length is connected to each other, rather than the downward riser or the drill pipe connected forward. Forward downward.

A blowout preventer (BOP) 7 is installed at the bottom of the seabed to prevent abnormally high pressure from rising up the drill pipe.

In the seabed, the casing 8 is fixed by cement, and then the bottom of the casing is drilled into a drill pipe equipped with a drill bit 10 to drill seabed resources. The mud 9 is inserted into the drill pipe to prevent the drill bit from overheating by the heat generated when the drill bit drills the ground and to lubricate it to make drilling easier. This mud exits through the drill bit 10 and back through the casing 8 and riser 4.

When the drilling operation is finished, the drill pipe is transported to the drill floor through the door pool 3, separated, and then transported to the loading site.

2 is a view showing a conventional derrick structure.

The conventional drilling line includes an upper deck 21 and a drill floor 22 positioned above the upper deck 21, and the drill floor 22 is provided with a derrick 20. The drill pipe 5 loaded horizontally in the pipe loading space is erected and supported by the top drive 23 and the rotary table 24. After two or more drill pipes 5 are joined to each other by a derrick, the combined drill pipes are temporarily loaded vertically in a pipe setback area and then advanced downward through the door pool 3 during drilling.

In general, the derrick 20 is a trust-type tower made of steel, a large structure of complex shape consisting of a beam and various drilling equipment, is fixed to the upper deck (deck), the height varies depending on the design There is, but about 100m.

Derrick is to elevate drilling equipment such as drill pipe, and by winding or unwinding the wire rope connected to the drilling equipment by the operation of the winch, elevating the drilling equipment to the desired position.

Drilling for these oils and gases is undertaken at ever deeper depths, both onshore and on land. Increasing depth has led to longer drilling times and increased costs (the cost of operating such equipment is already substantial, and the rent for some offshore equipment exceeds U.S. $ 400,000 to $ 500,000 per day).

Therefore, in order to save even a small amount of time in the drilling process, drilling-related work, which can be performed simultaneously or independently of the drilling operation, has become an economically important part.

Accordingly, the present invention has been invented in view of the above circumstances, and assembling / disassembling of various pipes for drilling simultaneously or independently of the drilling work, BOP (blow- The purpose is to provide auxiliary structures that perform drilling-related auxiliary operations such as out preventer and Christmas tree installation / dismantling.

One aspect of the present invention for achieving the above object is in the drilling ship for offshore drilling equipped with a derrick on the deck, performing the auxiliary operation for the drilling operation simultaneously or independently of the drilling operation by the derrick Auxiliary structures; The auxiliary structure includes a hoisting device that can be moved back, front, left, and right to handle or lift the drilling equipment to the seabed; And a fixing device for fixing the movement of the drilling equipment back, forth, left, and right when the drilling equipment is lifted to the sea floor by the hoisting device.

Characterized in that the lower portion of the auxiliary structure is provided with an extended door pool formed in the lower portion of the derrick.

The auxiliary operation is an assembly and dismantling operation of the drilling pipe; Drilling pipe transfer device for the transfer of the drilling pipe; And Pipe forming apparatus for assembling and disassembly of the drilling pipe; characterized in that it further comprises do.

The drilling pipe is a drilling pipe, casing, riser, liner, production tubing (production tubing) characterized in that.

The auxiliary operation is the installation and dismantling of the Christmas tree valve or the installation and dismantling of the BOP, characterized in that it further comprises a Christmas tree trolley for conveying the Christmas tree valve; and a trolley for conveying the BOP; .

The fixing device forms a hole penetrating up and down inside the trolley, and is installed in the hole.

The fixing device includes: an outer frame forming an outer edge of the trolley; an adapter frame installed to extend into the outer frame, the adapter frame being connected to one end by a hinge so as to be rotatable downward, and installed on the adapter frame. A split frame having one end connected to the hinge so as to be horizontally detachable while drawing an arc; And a power slip or spider and gimbal for fixing a drilling tube to an inner surface of the split frame hole.

Another aspect of the present invention is a drilling ship for offshore drilling equipped with a derrick on the deck, handling the drilling equipment to the auxiliary structure for performing the auxiliary work for the drilling operation simultaneously or independently of the drilling operation by the derrick Or a hoisting device is installed to elevate to the seabed, and the movement of the drilling equipment to be lifted to the seabed by the fixing device is fixed.

According to the present invention, by installing an auxiliary structure other than the derrick on the deck of the drilling vessel, assembling / disassembling of various tubes for drilling simultaneously or independently of the drilling operation in the derrick, blow-out preventer (BOP) and Christmas tree Drilling-related auxiliary work, such as installation and dismantling, can be performed to shorten the time required for well completion, thereby saving enormous operating costs.

In addition, by installing the door pool formed in the lower part of the derrick to extend to the lower part of the auxiliary structure, there is no need to manufacture a separate door pool for the auxiliary structure, no additional process for manufacturing a separate door pool is unnecessary, a plurality of door pools There is no increase in resistance to seawater generated during the voyage of the drilling ship, and thus, effects such as increased operating speed and reduced fuel consumption can be achieved.

1 is a view showing a conventional drilling ship performing drilling operation at sea level.
Figure 2 shows a conventional derrick structure.
Figure 3 is a side view schematically showing a portion except the door pool in the drilling vessel equipped with an auxiliary structure according to the present invention.
Figure 4 is a side view schematically showing a door pool of the drilling vessel equipped with an auxiliary structure according to the present invention.
Figure 5 is a plan view schematically showing a fixing device mounted to a drilling vessel equipped with an auxiliary structure according to the present invention.
FIG. 6 is a schematic view of section A in FIG. 5;
FIG. 7 is a schematic view of section B in FIG. 5; FIG.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings. Here, in adding reference numerals to the elements of each drawing, it should be noted that the same elements are denoted by the same reference numerals as much as possible even if they are shown in different drawings.

1 is a view showing a conventional drilling line performing drilling operation at sea level, Figure 2 is a view showing a conventional derrick structure, Figure 3 is a drilling vessel equipped with an auxiliary structure according to the present invention except for the door pool 4 is a side view schematically showing a part, and FIG. 4 is a side view schematically showing a door pool of a drilling ship equipped with an auxiliary structure according to the present invention, and FIG. 5 is mounted to a drilling ship equipped with an auxiliary structure according to the present invention. FIG. 6 is a plan view schematically illustrating the fixing device, FIG. 6 is a view schematically showing a cross-section A in FIG. 5, and FIG. 7 is a view schematically showing a cross-section B in FIG. 5.

As used herein, the term "driller" means a vessel equipped with facilities for drilling, and thus includes all drilling facilities such as semi-submersibles, submersibles, drill ships, barge rigs, and platform rigs. will be.

Also, as used herein, the term "tube" refers to all types of drilling pipes, casings, drill collars, liners, bottom hole assemblies, and other types of tubes known in the art.

Drilling operations generally require frequent interruptions when multiple tubular stands extend on the drilling deck. This is because additional pipes for drilling have to be moved out of the storage rack and connected to the top of the pipe stand, which is done inside the derrick, which causes significant delays in drilling.

A typical single drilling pipe section is 30 feet (about 10 m) in length. Stands are created by joining together single sections of two or more tubes. In the past, stands were assembled or constructed from a single section of four or five tubes.

Since the assembly of these tubes takes place inside the derrick, assembling and manipulating the tube stand independently of the drilling process is an important way to save time and money.

Therefore, the present invention has been invented in view of the above circumstances, and one embodiment of the present invention shown in FIG. 3 is an auxiliary structure 200, hoisting apparatus, in addition to the derrick 100 mounted on an upper deck. 250, the fixing devices 350 and 550.

The auxiliary structure 200 is installed on the upper deck (upper deck) of the drilling vessel to perform the auxiliary operation for the drilling operation simultaneously or independently of the drilling operation by the derrick 100.

The auxiliary structure 200 may be made of a steel structure that can support the load of the drilling rig, preferably may be made of a trust-type tower using steel.

The auxiliary structure 200 transfers the drilling pipe from the setback area for storing the drilling pipes by the pipe transfer device 400 to the auxiliary structure 200 or to the work area to the hoisting device. Drilling tubes can be used, and work in or on the substructure 200 on decks (upper decks or lower decks) by means of a Christmas tree trolley 302 or a BOP trolley 502. The Christmas tree 300 or the BOP 500 which has been transported to the area can be lifted to the sea floor using a hoisting device.

The hoisting device 250 is installed on the upper portion of the auxiliary structure 200, or as shown in Figure 3 is installed below the beam protruding outward from the upper portion of the auxiliary structure 200, various drilling equipment ( Drilling pipes, BOP, Christmas tree, etc.) to handle or lift the drilling equipment directly to the seabed using the door pool 503.

The hoisting device 250 lifts the tubes stored on the deck of the drilling vessel for the assembly of the drilling pipes without disturbing the drilling operation, a pipe forming device that is used for the assembly and disassembly of the drilling pipe ( 401 to assemble the drilling tube to make a tube stand, or to lift the tube stand for the task of dismantling the tube stand by the tube forming apparatus (401). The tube forming apparatus 401 is a device generally used for assembling and disassembling a tube, and is a device commonly called a roughneck.

The hoisting apparatus 250, as shown in Figure 4, drilling equipment such as Christmas tree valves or BOP equipment through the door pool 503 is formed in the lower portion of the derrick 100 and installed to extend to the lower portion of the auxiliary structure Move them to the sea floor.

The door pool 503 is shown as installed to extend to the bottom of the auxiliary structure of the door pool formed in the lower portion of the conventional derrick as shown in Figure 4, in addition to the conventional door pool in addition to the bottom of the auxiliary structure It can also be constructed by making a door pool.

In this case, in order to reduce resistance to seawater generated during voyage due to a plurality of moon pools, the moon pools should be sealed and operated to increase the operating speed and reduce fuel consumption.

The fixing devices 350 and 550 form a hole penetrating up and down inside the Christmas tree trolley 302 or the BOP trolley 502 (hereinafter referred to as 'trolley') and then ascend and descend to the inside of the hole. It is installed inside the hole to fix the drilling equipment.

The fixing device (350, 550) is required to assemble thousands of pipe stands to send the drilling equipment down to the seabed, because the drilling equipment that has to lift the seabed during the drilling process has to descend thousands of meters to the seabed through the door pool, It serves to fix the tube stand sent down to the seabed, and the lower part of the tube stand to be sent down to the seabed on the upper part of the tube stand fixed after fixing the tube stand sent down to the seabed with the fixing devices 350 and 550. After assembling using the forming apparatus 401, the drilling equipment is sent down to the sea floor.

At this time, the depth that can be sent down to the seabed by the trolleys (302, 502) is to the depth enough to support the weight of the tube stand and drilling equipment sent down to the seabed, After waiting at this depth for the end of drilling operations by the derrick, the trolley moves to the bottom of the derrick, and the pipe stand and drilling equipment sent down to the seabed are connected to the derrick's internal traveling block. The elevating work of the pipe stand and the drilling rig is done by the derrick elevating device.

5 to 7 illustrate the fixing device 350 installed on the Christmas tree trolley, the same may be applied to the fixing device 550 installed on the BOP trolley.

The fixing device 350 may be configured of an outer frame 360, an adapter frame 370, and a split frame 380.

The outer frame 360 forms the outer rim of the trolley 302, and most of the transfer to the trolley 302 together with the adapter frame 370 when the various drilling equipment is placed on top of the trolley 302. It supports the load.

The adapter frame 370 is installed to extend into the outer frame, and a hole is formed therein as shown in FIG. 5, and supports a load applied to the upper portion of the trolley 302 together with the outer frame 360. Do it.

In addition, the adapter frame 370 is configured to be rotatable downward, in Figure 6 is attached to a separate connection member 373 to the adapter frame 370, one end of the separate connection member is configured by a hinge The adapter member 372 is shown to swing in-out the adapter frame 370 downward.

The other end of the adapter frame 370 swings out when drilling equipment such as BOP is sent down to the seabed, and after drilling equipment is lowered to the seabed, the adapter frame 370 is moved to the outer frame again. Swing in upwards to secure to 360).

At this time, the other end of the adapter frame 370 should be manufactured to be opened to the outside to prevent interference with the pipe stand connected to the upper portion of the drilling equipment during the rotational drive, it is shown in Figure 5 as a U-shaped adapter frame. .

As shown in FIG. 6, the adapter frame 370 may be manufactured in a hook shape so as to be caught and fixed to the pin member 371 installed in the outer frame 360. Since the pin member 371 and the hook shape are intended to fix the adapter frame 370 to the outer frame 360, the pin member 371 and the hook shape may be replaced with another device if the present object can be achieved.

At this time, when the adapter frame 370 swings downward, the fixed adapter frame 370 must be released. In the case of the embodiment shown in FIG. 6, the pin member 370 is rearward. By retreating to the adapter frame 370 will be able to rotate to drive downward.

The driving member 372 may use electric or hydraulic power as a driving power source, and a rotation driving mechanism may rotationally drive the adapter frame using a general gear or a cylinder. In FIG. 6, a cylinder is attached. It is shown to rotate by hydraulic.

The split frame 380 is detachably installed on the upper part of the adapter frame 370, and as shown in FIG. 5, one end of the split frame 380 is separated by half while drawing an arc around a portion fixed by the hinge. It is designed to be.

The split frame 380 serves to fix the tube stand when the tube stand is to be lifted up and down the seabed when the tube stand is to be fastened, dismantled, or waits in water.

The split frame 380 removes drilling equipment such as a BOP or a Christmas tree valve to the seabed in order to prevent damage due to the load of the drilling equipment. After positioning on the frame 370, the pipe stand is connected to the upper part of the drilling equipment, and as described above, the adapter frame 370 is rotated downward to send the drilling equipment down to the sea floor.

Thereafter, the adapter frame 370 is rotated upward, and the split frame 380 is attached to the adapter frame 370 again to serve to fix the tube stand.

The split frame 380 has a hole having the same size as the adapter frame 370 therein, the center of the hole is made to match, the inner surface of the hole formed in the split frame 380 as shown in FIG. A fixing member 381 may be installed to fix the drilling tube as well.

The fixing member 381 may use a spider, a gimbal, or the like, which may fix a power slip or a riser to fix a drilling pipe.

The power slip is used for lifting a pipe without a protruding member such as a riser (flange, etc.) to the seabed, and the spider or gimbal is used for lifting a pipe with a protruding member such as a flange to the seabed.

The power slip, spider, and gimbal refer to power slip, spider, and gimbal generally used in the drilling field. In particular, since the split frame 380 is horizontally detachable, the power slip, spider, and gimbal should also be horizontally detachable. will be.

In FIG. 7, a riser is used as a drilling tube 385. When the riser moves up and down, there is a protruding member such as a flange 386, so that a fixing member 381 such as a spider, gimbal, or the like rises. As shown in FIG. 7, the split frame 380 separated to be fixed to each other is fixed to the flange 386 to be fastened to the fixing member 381 so as to assemble or disassemble a separate drilling riser stand or derrick. The tube stand can be fixed and waited during drilling at.

Hereinafter, the operation by the configuration of the present invention will be described.

First, the work of assembling the pipes for drilling will be described.

The hoisting apparatus 250 in the auxiliary structure 200 is accommodated in the mouth hole to support the tube transported by the tube transfer device 400 from the tube storage area (setback area) for storing the tube and then the tube Separate pipes are transferred from the storage area and the two tubes are assembled using the tube forming apparatus 401 to complete the stand. In the case of assembling a stand consisting of three pipes, another pipe is transferred from the pipe storage area to be assembled and completed.

Since the mouth hole is manufactured to a depth that can accommodate the stand, the stand can be manufactured by connecting a plurality of pipes according to the depth of the mouth hole. The finished stand is stored in the storage area of the stand.

Since the above work is done simultaneously or independently of the drilling work, the auxiliary work of pipe connection necessary for drilling work can be completed separately from the drilling work, which enables the continuous assembly of the stand for drilling during the drilling work. Save time.

In addition, the dismantling operation of the pipes for drilling can also reduce the time of drilling work because the derrick and the auxiliary structure can enter the work at the same time in the reverse order of the assembly work.

The operation of transporting the Christmas tree valve 300 or the BOP 500, the riser, etc. to the seabed is performed by the Christmas tree crane 301, the BOP crane 501, the pipe feeder, etc. It is seated on the tree trolley 302 or the BOP trolley 502 and then transferred into the substructure 200.

After that, the tube stand or another riser stand is connected to the upper part of the Christmas tree valve or BOP device and the riser stand which have been carried to the trolleys 302 and 502 by using the hoisting device 250 of the auxiliary structure. Transfer to the seabed through the inner hole. At this time, when sending down the Christmas tree valve, BOP, etc. to the seabed, as described above, the adapter frame 370 must operate the swing in (swing in-out).

If the Christmas tree valve, BOP, or riser stand is lowered to the seabed by the length of one tube stand or riser stand, another tube stand or riser stand must be connected, so the tube stand or riser stand is fixed by the fixing member 381 inside the trolley. After fixing the stand, connect another stand to the upper part of the stand which goes down to the seabed, and continue to lower the Christmas tree valve, BOP, and riser stand to the seabed.

The work of disassembling the stand can also be disassembled in the reverse order of the work using the fixing member inside the trolley.

If the above operation is performed using the auxiliary structure, it is not necessary to transfer the Christmas tree valve or the BOP device to the seabed by using the derrick, so that the drilling operation by the derrick can be prevented from being interrupted, thereby reducing the time for the drilling operation. .

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention will be.

100: Derrick 200: auxiliary structure
250: hoisting device 300: Christmas tree
301: Christmas tree crane 302: Christmas tree trolley
350: fixing device 360: outer frame
370: adapter frame 371: pin member
372: driving member 373: connecting member
380: split frame 381: fixing member
382: drive member 385: drilling tube
386: flange 400: pipe feeder
401: tube forming apparatus 500: BOP
501: BOP Crane 502: BOP Trolley
550: fixing device 503: door pool

Claims (8)

In the drilling ship for offshore drilling with a derrick mounted on the deck,
An auxiliary structure for performing an auxiliary operation for the drilling operation simultaneously or independently of the drilling operation by the derrick;
The auxiliary structure includes a hoisting device that can be moved back, front, left, and right to handle or lift the drilling equipment to the seabed; And
A fixing device for fixing movement of the drilling equipment back, front, left, and right when the drilling equipment is lifted to the sea floor by the hoisting device;
Drilling ship equipped with an auxiliary structure, characterized in that it comprises a.
The method according to claim 1,
A door pool formed at a lower portion of the derrick is extended below the auxiliary structure;
Drilling ship equipped with an auxiliary structure characterized in that.
The method according to any one of claims 1 to 2,
The auxiliary operation is an assembly and dismantling operation of the drilling pipe;
Drilling pipe transfer device for the transfer of the drilling pipe; And
Pipe forming apparatus for assembling and dismantling the drilling pipe;
Drilling ship equipped with an auxiliary structure, characterized in that it further comprises.
The method according to claim 3,
The drilling pipe is a drilling pipe, casing, riser, liner, production tubing (production tubing);
Drilling ship equipped with an auxiliary structure, characterized in that.
The method according to any one of claims 1 to 2,
The auxiliary work is the installation and dismantling of the Christmas tree valve or the installation and dismantling of the BOP,
A Christmas tree trolley for transporting the Christmas tree valve; and
A trolley for transporting the BOP;
Drilling ship equipped with an auxiliary structure, characterized in that it further comprises.
The method according to claim 1,
The fixing device forms a hole penetrating up and down inside the trolley, and is installed in the hole;
Drilling ship equipped with an auxiliary structure characterized in that.
The method of claim 6,
The fixing device,
An outer frame forming an outer rim of the trolley;
An adapter frame installed to extend into the outer frame, the adapter frame having one end connected to the hinge so as to be rotatable downward;
A split frame installed at an upper portion of the adapter frame and having one end connected to a hinge so as to be horizontally detachable while drawing an arc; And
Installing a power slip or spider and gimbal to fix a drilling tube to an inner surface of the split frame hole;
Drilling ship equipped with an auxiliary structure characterized in that.
In the drilling ship for offshore drilling with a derrick mounted on the deck,
A hoisting device for handling or elevating drilling rigs is installed on an auxiliary structure for performing auxiliary work on the drilling work simultaneously or independently of the drilling work by the derrick, and is lifted to the seabed by a fixed device. Fixed movement of drilling rigs;
Drilling ship equipped with an auxiliary structure characterized in that.

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