Marine vessel and method of operating such marine vessel

Abstract

The invention relates to an offshore vessel for performing activities related to a subsea wellbore, such as for drilling a subsea wellbore. The offshore vessel comprises a derrick. The invention further relates to a method for drilling a subsea wellbore (wherein an offshore vessel according to the invention is used) and a method for tripping in and out a tubular string. The offshore vessel is provided with a hoisting system having a first configuration in which a hoisting cable is connected to a working deck and a second configuration in which the hoisting cable is connected to a travelling block. The system enables efficient tripping in and tripping out.

Description

Technical Field

[0001] This invention relates to a marine vessel for performing activities related to subsea wellbores, such as drilling subsea wells. The marine vessel includes a drilling rig. The invention further relates to a method for drilling subsea wells (using the marine vessel according to the invention) and a method for running in and out drill strings. Background Technology

[0002] Tubing strings are used for a variety of purposes in the offshore industry. For example, a tubing string can be a drill string used to drill subsea wells. These tubing strings consist of fittings connected end-to-end (e.g., threaded connections) to form the tubing string. Each fitting is, for example, 12 meters long; however, the depth of a well can reach several kilometers. Therefore, many fittings are needed to form a tubing string that reaches the bottom of the well.

[0003] Sometimes, during drilling, it is necessary to remove the drill string from the wellbore. For example, to replace a drill bit worn down after drilling through hard formations. The process of removing the drill string from the wellbore is called tripping. Similarly, for example, after replacing a drill bit, the entire drill string must be returned to the wellbore. This process is called running in. During tripping, the entire drill string must be disassembled into fittings, such as standoffs, for example, double or triple standoffs. Tripping is a time-consuming process and is preferably performed as quickly and efficiently as possible.

[0004] Traditionally, tripping the drill string is performed by pulling it out of the wellbore by approximately one or more fitting lengths (called a stand). The top fitting is then removed and placed in storage. The string is then pulled out of the wellbore another length, and the process is repeated. This process is unsatisfactory because the string is not actually pulled out of the wellbore each time a fitting is removed, thus wasting valuable time. Furthermore, the repeated starting and stopping of the string can damage both the string and the wellbore, and cause ground shocks that can have adverse effects. Drilling is performed similarly and has similar adverse effects. Summary of the Invention

[0005] The object of this invention is to provide a multifunctional offshore vessel. For example, the invention aims to provide an offshore vessel capable of performing more efficient tripping and drilling operations. Another object of this invention is to provide an offshore vessel capable of performing tripping and drilling operations at a faster pace.

[0006] The present invention provides a marine vessel according to claim 1.

[0007] The advantage of the offshore vessel according to claim 1 is that the second lifting device allows the working deck to move independently of the traveling block during tripping. This enables continuous tripping because it allows the pipe string to continue moving while fittings are attached to or detached from the pipe string. For example, during tripping, as the working deck is lowered, the pipe string is suspended from the working deck via a slip device. The fitting is placed between the working deck and the traveling block by a fitting handling device and attached to the pipe string by a roughneck device, which moves vertically relative to the rig while the pipe string and working deck are still lowering. Next, the extended pipe string is suspended from the traveling block (which is also moving downwards) and disengaged from the slip device on the working deck. The working deck is then raised while the traveling block and pipe string move downwards. When the working deck reaches the top of the pipe string, the pipe string is again suspended from the working deck via a re-engaged slip device and disengaged from the traveling block. Then, the traveling trolley moves upward, and a new tube is placed between the traveling trolley and the tube column.

[0008] Another advantage of the offshore vessel according to claim 1 is that it enhances the distribution of lifting capacity. The second lifting winch can raise and lower the working deck when attached to it, while the first lifting winch can always raise and lower the floating trolley. When the floating trolley needs to lift heavy loads (e.g., very long drill strings), both lifting devices are connected to the floating trolley. Therefore, the first lifting device does not need to be able to lift the maximum line-related load on its own. This allows for a reduction in the power and size of the first lifting device, resulting in a more efficient offshore vessel.

[0009] The offshore vessel of the present invention is adapted to perform subsea wellbore-related activities, such as drilling subsea wells. The offshore vessel can also be adapted for other well entry operations, such as installing and removing subsea well control devices, performing well interventions, such as flexible tubing operations and cable operations, for example, for introducing chemicals into the well, or performing measurements in the well, such as temperature and / or pressure measurements.

[0010] The offshore vessel according to the invention is, for example, a monohull or a semi-submersible vessel. For example, a well is provided within the hull of the vessel. The drilling vessel may be a jack-up vessel. In embodiments, the offshore vessel (e.g., a jack-up vessel) may include a cantilever with a drilling rig mounted on it.

[0011] Pipe storage racks adapted to store multiple pipe fittings can be installed on the drilling vessel. Preferably, the pipe storage racks are positioned adjacent to or integrated with the drilling rig to facilitate easy transfer of pipe fittings between the work line and the storage racks. The pipe storage racks preferably allow pipe fittings (e.g., the vertical supports of interconnected pipe fittings) to be stored in a vertical orientation.

[0012] The vessel is further equipped with a drilling rig for connecting and disconnecting pipe fittings from the tubing string. The drilling rig is vertically movable relative to the rig to allow for connection and disconnection of pipe fittings as the tubing string moves vertically. The drilling rig may be mounted, for example, on a movable work deck. This allows the drilling rig to be positioned close to the connection point between two pipe fittings. Alternatively, the drilling rig may be mounted on a boom assembly that is vertically movable relative to the rig. For example, the boom assembly includes a telescopic boom that allows the drilling rig to move into and out of the work line.

[0013] The offshore vessel is further equipped with a pipe handling device, such as a pipe handling device having at least a first pipe handling assembly at the bottom and at least a second pipe handling assembly. In this example, the second pipe handling assembly can be operated at a higher position than the first pipe handling assembly. The pipe handling device is adapted to clamp and hold the pipe, place the pipe in a pipe storage rack, and remove the pipe from the pipe storage rack. The pipe handling device enables the pipe to be conveyed from a position on the production line to a position in the pipe storage rack.

[0014] For example, the pipe rack assembly can have an accessibility range that allows for the transfer of pipes held by the first and second pipe rack assemblies between a pipe storage rack and a position where the pipes are aligned with the work line of the vessel at sea. Each pipe rack assembly is vertically movable between a lower position and an elevated position. Pipes can be stored at a height different from their placement height in the work line. Therefore, it is advantageous that the rack assemblies are vertically movable. Furthermore, during the tripping process according to the invention, the pipe rack assemblies can move vertically, for example, in coordination with the vertical movement of the working deck and the slip devices thereon.

[0015] The offshore vessel further includes a vertically movable work deck, through which the work line extends through openings. Slippers are mounted on the work deck. The slippers are adapted to suspend the tubing from them when engaged with the tubing. The work deck may include a walkable surface for the operators of the offshore vessel. In another embodiment, the work deck does not include such a surface. The work deck supports the slippers and connecting devices for attaching a second lifting cable.

[0016] The first lifting device of the present invention includes a first lifting winch and a first lifting cable connected to the first lifting winch. The first lifting device is adapted to raise and lower the work string in the work line. The first lifting winch may be attached to the drilling rig, located near the drilling rig, or the first lifting winch may be located at different positions on the drilling vessel.

[0017] The stationary jack is preferably located near the top of the rig. The traveling jack is suspended from the stationary jack by a first lifting cable. The traveling jack is adapted to suspend the tubing string along the work line. The traveling jack is adapted to move vertically along the rig to raise and lower the tubing string. The traveling jack may carry a top drive unit for rotating the tubing string, for example, during drilling operations. The traveling jack may be connected to a hoist, which is guided relative to the rig via one or more hoist tracks. This makes the traveling jack more stable against movement (e.g., in the horizontal direction).

[0018] The vessel further includes a second lifting device comprising a second lifting winch and a second lifting cable. The second lifting winch may have the same shape and size as the first lifting winch. Alternatively, the second lifting winch may have a different shape and size. The second lifting cable is connected to the second lifting winch. The second lifting device further includes at least one connector adapted to selectively connect to one of a working deck and a floating trolley. The working deck and the floating trolley include compatible connection devices. The connector enables the second lifting device to lift the floating trolley together with the first lifting device, or to lift the working deck independently. This enables additional lifting capacity of the floating trolley, as well as flexible and independent lifting of the working deck relative to the floating trolley. When the connector is connected to the working deck, the working deck can be raised and lowered by the second lifting device; when the connector is connected to the floating trolley, the floating trolley is suspended by both the first and second lifting cables.

[0019] In one embodiment, the first lifting winch includes a first lifting drum, and the second lifting winch includes a second lifting drum. In another embodiment, the first and second lifting drums are respectively connected to a common winch drive unit via a first transmission device and a second transmission device, enabling the common winch drive unit to drive both the first and second lifting drums.

[0020] The first lifting cable can be wound onto a first lifting drum, and the second lifting cable can be wound onto a second lifting drum. Both lifting drums can be connected to a single common winch drive. The first lifting drum can be connected to the common drive via a first transmission, and the second lifting drum can be connected to the common drive via a second transmission. This allows the common winch drive to independently drive both the first and second lifting winches. This embodiment is advantageous because it eliminates the need for a second winch drive for the second lifting device, while retaining the flexibility of the system of the invention. The common winch drive is preferably adapted to lift the maximum working line load, such as the weight of a long drill string.

[0021] In one embodiment, the first and second transmission devices each include a planetary gear system. These planetary gear systems enable flexible connection between the winch drive and the first and second lifting drums. The planetary gear systems further enable flexible power distribution between the first and second lifting drums. In other embodiments, the transmission devices may include different systems.

[0022] In the implementation scheme, the ship is a floating ship and further includes a first heave compensation system and a second heave compensation system. The first heave compensation system is used to dampen the effect of the ship's motion caused by sea conditions on the first lifting device, and the second heave compensation system is used to dampen the effect of the ship's motion caused by sea conditions on the second lifting device.

[0023] These heave compensation systems, preferably, each have both active and passive heave compensation components. For example, a passive heave compensation system includes a hydraulic cylinder connected to a pulley engaged with a first or second lifting cable. In another embodiment, the heave compensation system is engaged with the winch drive of the vessel at sea. The heave compensation system enables heave compensation for the vessel at sea, thereby improving the system.

[0024] In one embodiment, the first lifting system includes a third lifting winch, wherein the first lifting winch is connected to a first end of the first lifting cable, and the third lifting winch is connected to a second end of the first lifting cable. In this embodiment, the first lifting cable may be connected to drums at both ends of the lifting cable. This allows the cable to be displaced relative to pulleys as it passes, for example, during heave compensation operations, taking into account reduced local wear. Furthermore, redundancy can be implemented.

[0025] In one embodiment, the second lifting system includes a fourth lifting winch, wherein the second lifting winch is connected to a first end of the second lifting cable, and wherein the fourth lifting winch is connected to a second end of the second lifting cable. Similar to the embodiment described above, in this embodiment, the second lifting cable may be connected to drums at both ends of the lifting cable.

[0026] In one embodiment, the third lifting winch includes a third lifting drum, and the fourth lifting winch includes a fourth lifting drum. In another embodiment, the third and fourth lifting drums are connected to a second common winch drive via a third and a fourth transmission, respectively, enabling the second common winch drive to drive both the third and fourth lifting drums. Preferably, this embodiment is combined with an embodiment that includes first and second drums connected to a common first winch drive. In this embodiment, flexible lifting with enhanced lifting capacity is possible. In this embodiment, it is possible that the first winch drive cannot lift the maximum weight of the pipe string, and the maximum weight of the pipe string must be lifted by both the first and second winch drives. This enables a relatively compact winch drive.

[0027] In one embodiment, the pipe fitting operating device includes a first pipe fitting manipulator assembly located below and a second pipe fitting manipulator assembly operable at a higher position than the first. For example, each assembly includes a base, a moving arm connected to the base, and a pipe fitting clamping member held by the moving arm. This enables a multi-functional manipulator assembly. The pipe fitting clamping member is adapted to clamp the pipe fitting. Preferably, when the moving arm is connected to the base via bearings, the moving arm can swing about a vertical axis. Preferably, the base is vertically movable, enabling rotation and vertical movement of the moving arm. In one embodiment, there may be more than two moving arms, such as three. In one embodiment, the drilling rig is connected to or can be connected to one of the moving arms to enable the drilling rig to move in and out of the workline and to move up and down relative to the workline, for example, in coordination with heave compensation movements of the working deck.

[0028] In this implementation, a working deck is positioned above the well and covers at least a portion of the well. This allows the working deck to be placed on top of the well when it is not connected to a second lifting cable.

[0029] In the implementation scheme, the hoisting system includes an electronic system for controlling the first and second hoisting devices. Preferably, the electronic system controls the winch devices to perform continuous tripping operations, for example, automatically.

[0030] In this implementation, the electronic system includes load sensors to measure the load on the first and second lifting devices. This allows the system to issue a warning when the maximum load is about to be exceeded. Additionally, the electronic system can be used to automate the tripping of the drill string.

[0031] In one embodiment, the lifting system further includes a pipe storage rack adapted to store a plurality of pipes, wherein a pipe operating device is adapted to place pipes in and remove pipes from the pipe storage rack, and wherein the pipe operating device has an accessibility range that at least enables the transfer of clamped pipes held between the pipe storage rack and a position where the pipes are aligned with the work line.

[0032] The present invention also relates to a method for drilling seabed wells, wherein a marine vessel as described in one or more of claims 1-11 is used.

[0033] In the implementation scheme, the method includes a drilling procedure, which includes the following steps:

[0034] - Use connectors to connect the second lifting cable to the working deck so that the lifting system is in the first configuration;

[0035] -Suspension column from the moving pulley;

[0036] - Engage the tubing with the slip device on the working deck near the top of the tubing and release the tubing from the floating trolley, thereby suspending the tubing from the slip device;

[0037] - Lower the working deck and tubing while raising the floating trolley to create space for tubing between the working deck and the floating trolley;

[0038] - The fittings are placed in the work line between the working deck and the floating trolley using a fitting handling device;

[0039] - As the working deck is lowered by the second lifting device, the pipe fittings are connected to the pipe string using the drilling equipment;

[0040] - Lower the traveling block and connect it to the top of the tubing;

[0041] - Release the tubing from the slip device, thereby suspending the tubing from the traveling trolley;

[0042] - Lower the floating pulleys and tubing while raising the working deck.

[0043] This method enables continuous drilling of the tubing string.

[0044] Alternatively, the method may include a tripping procedure, which includes:

[0045] - Use connectors to connect the second lifting cable to the working deck so that the lifting system is in the first configuration;

[0046] -Suspension column from the moving pulley;

[0047] - Raise the floating pulleys and tubing while lowering the working deck;

[0048] - When the working deck, floating trolley, and tubing are raised, engage the slips of the working deck with the tubing below the upper fitting;

[0049] -Use drilling equipment to separate the upper pipe fittings from the tubing string;

[0050] - Use the pipe fitting handling device to remove the upper pipe fitting from the work line;

[0051] - Lower the floating pulley while raising the working deck and tubing;

[0052] - Connect the tubing to the traveling block and disengage the slip device from the tubing, thereby suspending the tubing from the traveling block;

[0053] - Raise the floating trolleys and pipework while lowering the working deck;

[0054] This method enables continuous tripping of the drill string.

[0055] In the implementation scheme, the method includes a drilling procedure comprising the following steps:

[0056] - Use a connector to connect the second lifting cable to the traveling trolley so that the lifting system is in the second configuration;

[0057] -Suspension column from the moving pulley;

[0058] - Connect the top drive unit to the tubular column; and

[0059] - Well drilling operations are performed by using a hoisting system to lift the traveling block and tubing and by using a top drive to drive the tubing. Attached Figure Description

[0060] The invention will now be described in a non-limiting manner with reference to the accompanying drawings, in which the same reference numerals denote the same parts, wherein:

[0061] Figure 1 A front view of a ship at sea according to the present invention is depicted;

[0062] Figure 2 Depicting Figure 1 A side view of a ship at sea;

[0063] Figure 3 The top of the drilling rig is depicted, with the traveling block and top drive unit at their highest positions;

[0064] Figure 4 The working deck is depicted in a low, stationary position.

[0065] Figure 5 It is described from the side. Figure 4 Working deck;

[0066] Figure 6 The working deck is depicted in a slightly elevated position;

[0067] Figure 7 Describing relative to Figure 6 The image depicts a side view of the working deck in a further elevated position.

[0068] Figure 8 Depicting Figures 1-3 A top view of the drilling rig;

[0069] Figure 9a A schematic diagram of a first lifting device and a second lifting device in a first configuration is shown.

[0070] Figure 9b A schematic diagram of the first and second lifting devices in a second configuration is shown.

[0071] Figure 9c A schematic diagram depicts the first and third lifting winches connected to the common winch drive unit;

[0072] Figure 10a , Figure 10b , Figure 10c and Figure 10d Depicting Figures 1-8 A well drilling facility that performs a downhole drilling operation according to the method of the present invention. Detailed Implementation

[0073] Figure 1 A front view of an exemplary sea vessel 1 according to the present invention is depicted.

[0074] In this example, the offshore vessel 1 is a jack-up drilling vessel with a deck box structure 2 and a cantilever 27, which is movable relative to the deck box structure at least between an extended position and a retracted position.

[0075] In another embodiment, vessel 1 is a floating vessel, such as a semi-submersible or monohull vessel.

[0076] The ship 1 at sea includes a turret 4, which is erected on a cantilever 27. The ship 1 (here, its cantilever) has a deck 27a at the lower end of the turret 4, such as the top deck of the cantilever 27.

[0077] The work line 5 extends vertically, allowing wellbore-related operations involving drill tower 4 to be carried out along the work line 5.

[0078] exist Figure 1In the image, two pipe storage racks 6 can be seen. Each storage rack 6 is adapted to store multiple vertically oriented pipes 7 for use in well-related processes, such as drilling.

[0079] A drilling apparatus 8 is provided for connecting the fitting 7 to or disconnecting the fitting 7 from the string 9. For example, the drilling apparatus 8 is operated to connect the fitting 7 to the string 9 during drilling of the string 9.

[0080] Tower 4 has two vertical columns 4b and 4c, which are arranged opposite to the work line 5. Each vertical column 4b and 4c supports multiple motion arm assemblies 11, 12, and 13, with each column supporting three motion arm assemblies. These assemblies are arranged on top of another column 4b and 4c.

[0081] At least one pipe fitting operating device 10 is provided, which is adapted to clamp and hold the pipe fitting 7. The pipe fitting manifold device 10 can place the pipe fitting 7 into a corresponding pipe fitting storage rack 6 and remove the pipe fitting from the corresponding pipe fitting storage rack 6.

[0082] Each pipe fitting assembly 10 shown here includes component 12 and component 13.

[0083] In this embodiment, each component 11, 12, 13 includes a base 28 and a movable arm 29 connected to the base 28. Preferably, each movable arm 29 is telescopically extendable and retractable via a telescopic mechanism. Preferably, each movable arm 29 is controllably oscillating in the horizontal plane because its inner end can be rotated relative to the base 28 about a vertical axis via a oscillation drive.

[0084] Preferably, each of the two components 12 and 13 is provided with a pipe clamping member 30 at the outer end of its moving arm 29.

[0085] The drilling device 8 is connected to the lowermost motion arm assembly 11, for example, the motion arm 29 connected to assembly 11 here.

[0086] Multiple components 11, 12, 13 can move vertically along the vertical columns 4b, 4c of the derrick 4, preferably independently, for example, each component can move vertically by its own vertical drive mechanism.

[0087] The accessibility of each pipe fitting device 10 is such that the pipe fitting 7 held by the components 12, 13 provided with the pipe fitting clamping member 30 can be transferred between the pipe fitting storage rack 6 and the position of the pipe fitting 7 aligned with the work line 5.

[0088] The offshore vessel 1 further includes a working deck 14 that can be vertically moved relative to the rig 4.

[0089] The work line 5 extends through the work deck 14, allowing the tubing string 9 to pass through it. The work deck 14 is provided with a slip device 15. The slip device 15 is adapted to suspend the tubing string 9 from it when the slip device 15 is engaged with the tubing string 9.

[0090] The sea vessel 1 further includes a first lifting device, which includes a first lifting winch 17, a third lifting winch 23 and a first lifting cable 18.

[0091] In this example, the first lifting winch 17 and the third lifting winch 23 are located on one side of the cantilever 27. In various embodiments, it is possible for the first lifting winch 17 and / or the third lifting winch to be located on the deck of the ship (e.g., when the rig 4 is located on the deck of the ship 1) or in the rig 4.

[0092] The first lifting cable 18 runs between the first lifting winch 17 and the third lifting winch 23, so that one end is connected to the winch 17 and the other end is connected to the winch 23.

[0093] Tower 4 supports a fixed pulley 19. The fixed pulley 19 includes several pulleys to guide the first lifting cable 18. The traveling pulley 20 is suspended from the fixed pulley 19 via the first lifting cable 18 in a multi-rope arrangement. More specifically, the fixed pulley 19 has multiple pulleys 18a, and the traveling pulley has one or more pulleys 18b to provide a multi-rope arrangement.

[0094] The movable trolley 20 is adapted to run along the work line 5 from its suspension column 9.

[0095] In the accompanying drawings, the trolley 20 carries a top drive unit 21, which can be connected to the top of the column 9. As is known in the art, the top drive unit 21 includes one or more motors to provide rotational torque to the column 9.

[0096] The trolley 20 and the top drive unit 21 can move vertically via the first lifting winch 17 and the third lifting winch 23.

[0097] In the accompanying drawings, a top drive unit 21 is connected to a hoisting trolley 31, which moves along one or more vertical hoisting trolley guides (e.g., tracks) on the rig 4. This allows the top drive unit 21 to be guided by the hoisting trolley guides as it moves vertically along the rig 4.

[0098] A second lifting device is provided, comprising a second lifting winch 24 and a fourth lifting winch 25. The second lifting device 22 further includes a second lifting cable 26, one end of which is connected to the second lifting winch 24 and the other end of which is connected to the fourth lifting winch 25.

[0099] exist Figure 1 In the middle, the second lifting cable 26 is connected to the working deck 14 via connector 3, so that the working deck 14 can be raised and lowered by the second lifting device 22.

[0100] More specifically, the second lifting cable 26 extends from the pulley 26a of the fixed pulley 19 in two multi-reel arrangements to two sets of horizontally spaced floating pulleys 26b. Each set of one or more floating pulleys 26b is mounted to a connector 3. Each connector 3 can be selectively connected to the work deck 14 and one of the floating pulleys 20.

[0101] The two multi-roller arrangements of the second lifting cable 26 (each support corresponding to a connector 3) are spaced apart on exactly opposite sides of the work line 5, making the open space for movement in the work line 5 above the work deck 14 possible.

[0102] exist Figure 1 In this configuration, the working deck 14 is in a lower position, and the top drive unit 21 is in a higher position. This allows the pipe fitting 7 to be placed in the space between the working deck 14 and the top drive unit 21.

[0103] In the implementation scheme, for example, Figure 1 As shown, the first lifting winch 17 includes a first lifting drum, and the second lifting winch 24 includes a second lifting drum.

[0104] In the implementation scheme, for example, Figure 1 As shown, winches 17 and 24 are driven independently. In another embodiment, the first lifting winch 17 includes a first lifting drum, and the second lifting winch 24 includes a second lifting drum, both drums being driven by a single common winch drive unit 35, see [link to relevant documentation]. Figure 9c A simplified illustration. In this case, the first lifting winch 17 and the second lifting winch 24 are connected to the common winch drive unit 35 via a first transmission 36 and a second transmission 37, respectively, for example, each transmission includes a planetary gear system.

[0105] Figure 2 Depicting Figure 1 A side view of the ship 1 at sea. In this figure, mud hose 32 can be seen connected to top drive unit 21 to allow mud to be transferred to tubing string 9.

[0106] Figure 3 A close-up of the traveling trolley 20 carrying the top drive unit 21 when located near the fixed trolley 19 of the derrick 4 according to the present invention is depicted.

[0107] exist Figure 3 In the middle, the second lifting cable 26 is not connected to the working deck 14, which is located in its lower, stationary position (see...). Figure 4 In this lower, stationary position, the working deck 14 rests on the structure of the ship's deck 27a (here, the cantilever), or in other embodiments, for example, on the ship's hull.

[0108] Deck 14 and deck 27a may be provided with tracks arranged in a row at the lower rest position, so that equipment can be conveyed (e.g., glided) on the tracks for transferring equipment between deck 14 and deck 27a.

[0109] exist Figure 3 In this configuration, the second lifting cable 26 is connected to the traveling trolley 20 via connector 3. More specifically, in the depicted embodiment, each connector 3 connects one or more associated pulleys 26b to the traveling trolley 20, for example, at any end of a series of pulleys 19b on the traveling trolley.

[0110] The connection of cable 26 to trolley 20 via connector 3 provides a configuration that increases the load capacity of the traveling trolley 20. This is useful in some stages of the drilling process, such as when a higher load (e.g., a very long drill string) is suspended from the traveling trolley 20, for example from the top drive unit 21 carried by the traveling trolley 20.

[0111] like Figure 8 As shown, for example, the top drive unit 21 is connected to the hoist 31, which guides the top drive unit 21 along the derrick 4, here along the vertical column 4a of the derrick 4, for example along the guide rail 31a thereon.

[0112] The figure shows that the top drive unit 21 includes a lifting ring 33 that supports the lift 34, as is known in the art.

[0113] As Figure 3 As can be seen, the first and second lifting cables 18 and 26 are guided outside the rig 4 between the fixed pulley 19 and the lifting winch. In other embodiments, the first and second lifting cables 18 and 26 may be guided along different paths between the lifting winch and the fixed pulley, for example, inside the rig 4.

[0114] exist Figure 4 Another configuration is shown, in which connector 3 is connected to the working deck 14 but not to the floating trolley 20. This allows the working deck 14 to be raised and lowered by means of a second lifting device, since the deck 14 is effectively suspended from the fixed trolley by cable 26.

[0115] exist Figure 4 In the figure, the working deck 14 is in its lower, stationary position. The floating trolley 20 and the top drive unit 21 are also in their lower positions, adjacent to the working deck 14. Figure 5 Depicting the situation Figure 4 A close-up side view of the work deck 14 in its lower, stationary position. Alternatively, the slip device 15 is shown displaced to a retracted position, away from the operating position aligned with the work line 5, thereby enabling, for example, operations that do not require the slip device 15. There may also be two slip devices 15 on the deck 14, each movable between a retracted position and an operating position, these two retracted positions being exactly opposite to the work line. This arrangement is known in the art.

[0116] like Figure 4 As shown, the drilling device 8 carried by component 11 can be used to assemble and disassemble the string 9 in conjunction with the slip device 15.

[0117] Component 11 allows the drilling rig 8 to move vertically, for example, in sync with the movement of the deck 14, such as when the deck 14 moves in a heave-compensated mode. The drilling rig 8 can then be used for drill string assembly and / or disassembly. In this heave-movement method, components 12 and 13 can also move in coordination with the movement of the deck 14, so that the pipe fitting 7 can be moved into and out of the work line 5 above the deck 14 during the process.

[0118] Figure 4 The diagram also shows a diverter 55 mounted to deck structure 27a, below the working deck 14 in its lower, stationary position. Diverters 55 are known in the art as part of a mud circulation and treatment system.

[0119] Figure 5 Also shown is a catwalker 50 with a towing arm 51, which is mounted on deck 27a and movable on an associated track 52 to a position where the machine 50 extends partially onto deck 14 from its lower rest position. This can be used, for example, to deploy risers known in the art.

[0120] Figure 6 Describing relative to Figure 4 A close-up of the working deck 14, depicted in a slightly elevated position. Figure 5 In the middle, the working deck 14 and the slip device 15 on it have been raised by the second lifting device 22.

[0121] As an implementation plan Figure 6 The work deck 14 is shown being guided vertically along the rig 4 (here, along the column 4a) by a work deck tractor 39 guided by one or more vertical guide rails 39a.

[0122] Figure 6The slip device 15 has been moved from the production line 5. This allows for the placement of a second slip device 15 that can be adapted to a pipe fitting 7 with a different diameter.

[0123] Figure 6 The pipe fitting 7 is shown moving horizontally toward the work line 5. The pipe fitting 7 can be erected by a pipe fitting erector or some other device.

[0124] Figure 7 Describing relative to Figure 6 The image shows a close-up side view of the slightly elevated work deck 14 in a further elevated position. The catwalk 50 has been retracted to allow the work deck 14 to be raised.

[0125] Figure 8 A top view of rig 4 is depicted.

[0126] Figure 8 Three columns, 4a, 4b, and 4c, are shown.

[0127] Columns 4b and 4c are erected above deck 27a at positions opposite to work line 5. The position of column 4a is set to be offset from the plane passing through columns 4b and 4c.

[0128] Columns 4a, 4b, and 4c merge at the top of tower 4 to support fixed pulley 19.

[0129] Column 4a guides the top drive unit 21 and the hoisting vehicles 31 and 39 of the working deck 14, respectively.

[0130] Columns 4b and 4c each guide multiple vertically moving motion arm assemblies 11, 12, and 13.

[0131] Figure 4 Three pipe storage racks 6 are shown as examples.

[0132] A storage rack 6 is within the reach of the pipe operating device 10 formed by components 12 and 13 on column 4c. The storage rack is also within the reach of the pipe operating device 10 formed by components 12 and 13 on column 4b.

[0133] The fitting 7 can be arranged in a radial groove centered on the vertical pivot axis of the moving arm 29 of the corresponding fitting manifold device 10. Each fitting manifold device 10 can pick up the fitting 7 from the storage rack 6 and transport it to the production line 5.

[0134] Figure 9aA schematic diagram of a drilling facility is depicted, in which a first lifting device and a second lifting device are in a first configuration. In this configuration, a first lifting cable 18 is connected to a traveling block 20 that carries a top drive unit 21. A second lifting cable 26 is then connected to the working deck 14 via a connector 3. This configuration allows the traveling block 20 and the working deck 14 to move vertically independently of each other, including synchronized movements when necessary. In this configuration, the drill string 9 can be run down or pulled up according to the method of the invention.

[0135] Figure 9b A schematic diagram of a drilling facility is depicted, in which a first lifting device and a second lifting device are in a second configuration. In this second configuration, both the first lifting cable 18 and the second lifting cable 26 are connected to a traveling block 20, with the working deck 14 in its lower, stationary position. The second lifting cable 26 is connected to the traveling block 20 via a connector 3. Figure 9a Compared to the first configuration shown, this configuration enables the traveling trolley 20 to handle larger loads, such as heavy drill strings and risers.

[0136] Figure 9c A schematic diagram depicts a first lifting winch 17 and a third lifting winch 23 connected to a common winch drive unit 35 (e.g., an electric motor). The common winch drive unit 35 is connected to the first lifting winch 17 and the third lifting winch 23 via a first transmission 36 and a second transmission 37, respectively. As shown, each transmission 36, 37 can preferably be implemented as a planetary gear transmission. This allows for more efficient driving of the first and third lifting winches because only a single drive unit 35 is required. For example, this reduces the amount of space required for the winch drive unit on ship 1.

[0137] Figure 10a , Figure 10b , Figure 10c and Figure 10d The drilling rig 4 and hoisting system are depicted, which are placed on the offshore vessel 1 to perform the drilling operation according to the method of the invention. A second lifting cable 26 is connected to the working deck 14, and a first lifting cable 18 is connected to the floating trolley 20 and the top drive unit 21.

[0138] Figure 10a The diagram depicts the rig 4 and hoisting system in the initial position, with the top drive unit 21 and the working deck 14 positioned adjacent to each other. To receive the tubing 7, the top drive unit 21 moves upward, and the working deck 14 moves downward. In this embodiment, the tubing string 9 is suspended from the working deck 14 by slip devices 15. Therefore, when the working deck 14 is lowered, the tubing string 9 is also lowered.

[0139] When Drill Tower 4 and the hoisting system have arrived Figure 10bIn the position shown, the pipe fitting 7 is placed between the working deck 14 and the floating trolley 20 via the pipe fitting manifold device 10.

[0140] When rig 4 and the hoisting system are Figure 10b and Figure 10c When moving between the indicated positions, fitting 7 is connected to column 9, and traveling trolley 20 is lowered to connect top drive unit 21 to fitting 7.

[0141] When drill tower 4 and the hoisting system are in Figure 10c At the position shown, the tube string 9 is released from the slip device 15 and suspended from the traveling trolley 20.

[0142] Lower the floating chute 20 while raising the working deck 14 to place the rig 4 and hoisting system in the designated location. Figure 10d The position shown indicates that the slip device 15 is engaged with the tubing string 9, and the rig and hoisting system are again in position. Figure 10a The location shown. Figures 10a-10d The method shown can be repeated multiple times to drill down the tubing string 9.

[0143] Furthermore, those skilled in the art will understand that the method steps can be performed in reverse order to perform the drilling operation according to the invention.

Claims

1. A marine vessel used for performing activities related to subsea wells, wherein, The vessel includes: - Drilling towers and associated work lines, - Fixed pulley, which is supported by the drilling rig. - A movable trolley, adapted to suspend the tubular column along the work line. - A lifting system having a first lifting device, comprising: - A first lifting winch and a first lifting cable connected to the first lifting winch, wherein a traveling block is suspended from a stationary block via the first lifting cable. - A drilling rig used for connecting and separating pipe fittings during the assembly and disassembly of the drilling string in the work line, the drilling rig being vertically movable relative to the drilling tower. Pipe fitting operating device The pipe fitting operating device is adapted to clamp and hold the pipe fitting, and to move the pipe fitting between a remote position and a position on the work line. The pipe fitting operating device is configured to vertically move the clamped and held pipe fitting between a lower position and a raised position on the work line. - The working deck, which can move vertically relative to the rig; - A slip device, which is installed on the working deck and, when engaged with the tubing string, is adapted to suspend the tubing string in the working line. The lifting system further includes: - A second lifting device, comprising a second lifting winch, a second lifting cable connected to the second lifting winch, and a connector suspended from a fixed pulley by the second lifting cable, wherein the connector is adapted to selectively connect to one of a working deck and a floating pulley; The lifting system provides a first configuration and a second configuration. In the first configuration, the connector is connected to the working deck, allowing the working deck to be raised and lowered via a second lifting device, while the floating trolley is raised and lowered via the first lifting device. In the second configuration, the connector is connected to the traveling trolley, which is suspended by both the first and second lifting cables, so that the column suspended from the traveling trolley will be raised and lowered by both the first and second winches.

2. The seagoing vessel according to claim 1, wherein, The first lifting winch includes a first lifting drum, and the second lifting winch includes a second lifting drum, wherein the first lifting drum and the second lifting drum are respectively connected to a common winch drive device via a first transmission device and a second transmission device, so that the common winch drive device can drive the first lifting drum and the second lifting drum.

3. The seagoing vessel according to claim 2, wherein, The first transmission device and the second transmission device each include a planetary gear system.

4. The seagoing vessel according to claim 1, wherein, The vessel is a floating vessel and further includes a first heave compensation system and a second heave compensation system. The first heave compensation system is used to dampen the effect of the vessel's motion caused by sea conditions on the first lifting device, and the second heave compensation system is used to dampen the effect of the vessel's motion caused by sea conditions on the second lifting device.

5. The seagoing vessel according to claim 1, wherein, The first lifting system includes a third lifting winch, wherein the first lifting winch is connected to the first end of the first lifting cable, and the third lifting winch is connected to the second end of the main lifting cable.

6. The seagoing vessel according to claim 1, wherein, The second lifting system includes a fourth lifting winch, wherein the second lifting winch is connected to a first end of the second lifting cable, and wherein the fourth lifting winch is connected to a second end of the second lifting cable.

7. The seagoing vessel according to claim 1, wherein, The first lifting system includes a third lifting winch, wherein the first lifting winch is connected to a first end of a first lifting cable, and the third lifting winch is connected to a second end of the first lifting cable. The second lifting system includes a fourth lifting winch, wherein the second lifting winch is connected to a first end of a second lifting cable, and wherein the fourth lifting winch is connected to a second end of the second lifting cable. The third lifting winch includes a third lifting drum, and the fourth lifting winch includes a fourth lifting drum. The third and fourth lifting drums are connected to the second common winch drive unit via a third transmission device and a fourth transmission device, respectively, so that the second winch drive unit can drive the third and fourth lifting drums.

8. The seagoing vessel according to claim 1, wherein, The pipe fitting operating device is a pipe fitting manifold device, which includes a first pipe fitting manifold assembly below and a second pipe fitting manifold assembly operable at a higher position than the first pipe fitting manifold assembly. Each pipe fitting manifold assembly includes a base, a moving arm connected to the base, and a pipe fitting clamping member held by the moving arm.

9. The seagoing vessel according to claim 1, wherein, The working deck is located above the ship's well, and the working deck covers at least a portion of the well.

10. The seagoing vessel according to claim 1, wherein, The lifting system includes an electronic system configured to control the first and second lifting devices.

11. The seagoing vessel according to claim 1, wherein, The vessel further includes a pipe storage rack adapted to store a plurality of pipes in a vertical orientation therein, wherein a pipe operating device is adapted to place pipes in and remove pipes from the pipe storage rack, and wherein the pipe operating device has an access range that at least allows for the transfer of clamped pipes between the pipe storage rack and a position where the pipes are aligned with the work line.

12. A method for drilling subsea wellbores, wherein, Using a sea vessel, the sea vessel including: - Drilling towers and associated work lines, - Fixed pulley, which is supported by the drilling rig. - A movable trolley, adapted to suspend the tubular column along the work line. - A lifting system having a first lifting device, comprising: - A first lifting winch and a first lifting cable connected to the first lifting winch, wherein a traveling block is suspended from a stationary block via the first lifting cable. - A drilling rig used for connecting and separating pipe fittings during the assembly and disassembly of the drilling string in the work line, the drilling rig being vertically movable relative to the drilling tower. Pipe fitting operating device The pipe fitting operating device is adapted to clamp and hold the pipe fitting, and to move the pipe fitting between a remote position and a position on the work line. The pipe fitting operating device is configured to vertically move the clamped and held pipe fitting between a lower position and a raised position on the work line. - The working deck, which can move vertically relative to the rig; - A slip device, which is installed on the working deck and, when engaged with the tubing string, is adapted to suspend the tubing string in the working line. The lifting system further includes: - A second lifting device, comprising a second lifting winch, a second lifting cable connected to the second lifting winch, and a connector suspended from a fixed pulley by the second lifting cable, wherein the connector is adapted to selectively connect to one of a working deck and a floating pulley; The lifting system provides a first configuration and a second configuration. In the first configuration, the connector is connected to the working deck, allowing the working deck to be raised and lowered via a second lifting device, while the floating trolley is raised and lowered via the first lifting device. In the second configuration, the connector is connected to the traveling trolley, which is suspended by both the first and second lifting cables, so that the column suspended from the traveling trolley will be raised and lowered by both the first and second winches.

13. The method according to claim 12, wherein, The method includes a drilling procedure, which includes: - Use connectors to connect the second lifting cable to the working deck so that the lifting system is in the first configuration; -Suspension column from the moving pulley; - Engage the tubing with the slip device on the working deck near the top of the tubing and release the tubing from the floating trolley, thereby suspending the tubing from the slip device; - Lower the working deck and tubing while raising the floating trolley to create space for tubing between the working deck and the floating trolley; - The fittings are placed in the work line between the working deck and the floating trolley using a fitting handling device; - As the working deck is lowered by the second lifting device, the pipe fittings are connected to the pipe string using the drilling equipment; - Lower the traveling block and connect it to the top of the tubing; - Release the tubing from the slip device, thereby suspending the tubing from the traveling trolley; - Lower the floating pulleys and tubing while raising the working deck.

14. The method according to claim 12, wherein, The method includes a tripping-out procedure, which includes: - Use connectors to connect the second lifting cable to the working deck so that the lifting system is in the first configuration; -Suspension column from the moving pulley; - Raise the floating pulleys and tubing while lowering the working deck; - When the working deck, floating trolley, and tubing are raised, engage the slips of the working deck with the tubing below the upper fitting; -Use drilling equipment to separate the upper pipe fittings from the tubing string; - Use the pipe fitting handling device to remove the upper pipe fitting from the work line; - Lower the floating pulley while raising the working deck and tubing; - Connect the tubing to the traveling block and disengage the slip device from the tubing, thereby suspending the tubing from the traveling block; - Raise the floating trolley and pipe fittings while lowering the working deck.

15. The method according to claim 12, wherein, The method includes a drilling procedure, the drilling procedure comprising: - Use a connector to connect the second lifting cable to the traveling trolley so that the lifting system is in the second configuration; - The suspension column is carried by a top drive unit supported by a trolley; - Perform wellbore drilling operations, which involve rotating the drill string using a top drive and lowering the drill string using a second lifting device.

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