WELLBORE DRILLING WITH A TROLLEY AND A TOP DRIVE DEVICE

Abstract

A method for removal of a top drive device in a wellbore drilling installation, for servicing and/or exchanging a top drive device. The frame of the trolley and the top drive device are provided with cooperating vertical guide members so that the top drive device is vertically displaceable and guided relative to the frame. The top drive device has an operative position above the rotatable head clamp assembly carrier, which is releasably connected to first and second vertical frame members. In order to service and/or exchange of the top drive device, the method includes releasing the rotatable head clamp assembly carrier from the first and second frame members, removing the rotatable head clamp assembly carrier, lowering the top drive device relative to the frame of the trolley until the cooperating vertical guide members thereof disengage, moving the lowered and disengaged top drive device to a service and/or storage location remote from the firing line.

Claims

1. A drilling installation comprising: a drilling tower; a drill floor having a well center through which a drilling tubulars string can pass along a firing line into a wellbore; at least one vertical trolley rail; a trolley, said trolley being guided along the at least one vertical trolley rail; a main hoisting device configured to lift and lower said trolley along said at least one vertical trolley rail; and a top drive device attached to the trolley, said top drive device comprising one or more top drive motors, wherein the trolley comprises a trolley frame suspended from said main hoisting device, wherein the drilling installation further comprises: one or more components to be suspended from the trolley frame below the top drive device, one or more carts that are movable onto the drill floor underneath the trolley and are adapted to receive thereon the top drive device or a component of said one or more components, and wherein at least one of said carts comprises a straddling structure having a top structure configured to support one or more of said components and having a raised straddle frame.

2. The drilling installation according to claim 1, wherein the raised straddle frame has a height of at least 2 meters above the drill floor when the cart is positioned on the drill floor underneath the trolley.

3. The drilling installation according to claim 1, wherein the raised straddle frame allows placement of the cart over a stick-up portion of a drilling string held by a slip device.

4. The drilling installation according to claim 1, wherein said main hoisting device comprises one or more winch driven cables from which said trolley is suspended.

5. The drilling installation according to claim 1, wherein the drill floor is provided with one or more drill floor rails, and wherein the one or more carts is supported on said one or more drill floor rails such that the one or more carts is positionable over the well center of the drill floor.

6. The drilling installation according to claim 5, wherein said drill floor is provided at said well center with a slip device, and wherein the cart is configured to be positionable over the well center whilst the slip device keeps a drilling tubulars string suspended in the wellbore associated with said firing line with a stick-up portion of said drilling tubulars string extending above said drill floor.

7. The drilling installation according to claim 6, wherein a pair of drill floor rails extend on opposite sides along the well center of the drill floor.

8. The drilling installation according to claim 1, wherein said one or more components further comprise one or more of: a casing running tool; a casing drive tool; a riser lifting tool adapted for use in upending of a riser section to be added to a riser string and/or for lifting and lowering a riser string in subsea wellbore related activities; a coiled tubing injector; and a thrust bearing component provided with a thrust bearing that is configured to support the load of the drilling tubulars string, so that said load is transmitted via said thrust bearing component to first and second vertical frame members of the trolley frame and thereby to said trolley frame member suspended from said main hoisting device,

9. A method for performing a wellbore related process, comprising providing the wellbore drilling installation according to claim 1 and performing the wellbore related process.

10. A method for operating the wellbore drilling installation according to claim 1, the method comprising removing of a component suspended from first and second vertical frame members of the trolley frame by performing the following steps: positioning one cart of the one or more carts on the drill floor underneath the trolley; lowering the trolley by the main hoisting device and bringing the component to rest on the cart; releasing the component from lower connector members of first and second vertical frame members; moving the one cart away, with the released component, to a remote location.

11. A method for removal of a top drive device in a wellbore drilling installation, wherein the wellbore drilling installation comprises: a drilling tower; a drill floor having a well center through which a drilling tubulars string can pass along a firing line into the wellbore; at least one vertical trolley rail; a trolley, said trolley being guided along said at least one vertical trolley rail; a main hoisting device configured to lift and lower said trolley along said at least one vertical trolley rail, wherein said main hoisting device comprises one or more winch driven cables from which said trolley is suspended; and a top drive device attached to the trolley, the top drive device comprising: one or more top drive motors; and a rotary output member in said firing line and being driven by said one or more top drive motors in order to impart rotary motion to a drilling tubulars string when connected to said top drive device, the method comprising supporting a cart on one or more drill floor rails and positioning the cart over the well center of the drill floor, wherein said drill floor is provided at said well center with a slip device.

12. The method according to claim 11, wherein the method further comprises: keeping a drilling tubulars string suspended in the wellbore associated with said firing line using the slip device, wherein a stick-up portion of said drilling tubulars string extends above said drill floor; and positioning said cart at said well center, over said stick-up portion of said drilling tubulars string so that said component or top drive device rests on said cart and is moved away using said cart while the stick-up portion remains in place.

13. The method according to claim 11, wherein, in order to remove the top drive device, the method comprises: lowering said top drive device relative to a frame of said trolley; moving said lowered and disengaged top drive device away; keeping a drilling tubulars string suspended in the wellbore associated with said firing line by means of said slip device, wherein a stick-up portion of said drilling tubulars string extends above said drill floor; and positioning said cart at said well center, over said stick-up portion of said drilling tubulars string so that said component or top drive device can be made to rest on said cart and moved away by using said cart whilst said stick-up portion remains in place.

14. The method according to claim 11, wherein the trolley comprises a trolley frame, the trolley frame comprises: a top frame member suspended from said main hoisting device; a first vertical frame member and a second vertical frame member, the first and second frame members connected at an upper end thereof to said top frame member, said first and second vertical frame members being spaced apart from one another and adapted to support the load of a drilling tubulars string that passes along said firing line into the wellbore; and a thrust bearing component releasably connected to and suspended from said first and second vertical frame members of the trolley frame, said thrust bearing component being provided with a thrust bearing that is configured to support the load of a drilling tubulars string, so that said load is transmitted via said thrust bearing component to said first and second vertical frame members and to said top frame member suspended from said main hoisting device, wherein trolley frame and the top drive device are provided with cooperating vertical guide members and the top drive device is vertically displaceable and guided relative to the trolley frame, wherein said top drive device has an operative position above said thrust bearing component, the method further comprises: releasing the thrust bearing component from the first and second vertical frame members; removing said thrust bearing component; and lowering said top drive device relative to said trolley frame until said cooperating vertical guide members thereof disengage.

Description

[0201] The invention will now be described with reference to the appended drawings. In the drawings:

[0202] FIG. 1 shows a wellbore drilling installation according to the invention,

[0203] FIG. 2 shows in side view the trolley and top drive device of the installation of FIG. 1,

[0204] FIG. 3 shows in view from the rear the trolley and top drive device of the installation of FIG. 1,

[0205] FIG. 4 illustrates an example of the rotatable head clamp assembly of the installation of FIG. 1,

[0206] FIGS. 5a-c further illustrate the rotatable head clamp assembly of FIG. 4,

[0207] FIGS. 6-17 illustrate in a step by step manner the removal of components from the trolley of the installation of FIG. 1,

[0208] FIG. 18 illustrates an alternative embodiment of the trolley with top drive device, carrier, and wrench device,

[0209] FIG. 19 illustrates in plan view an example of an wellbore drilling installation according to the invention,

[0210] FIG. 20 illustrates in vertical sectional view a well intervention structural frame component suspended from the trolley along the drilling tower above the well center in the drill floor,

[0211] FIG. 21 illustrates the well intervention structural frame component of FIG. 20,

[0212] FIG. 22 illustrates a lower height cart as well as a raised straddle frame cart positioned over a stick-up end of a tubular retained by the slip device above the drill floor in the well center.

[0213] FIG. 1 shows a wellbore drilling installation with a trolley, top drive device, and rotatable head clamp and carrier according to the invention. It is envisaged that the depicted installation is part of an offshore drilling vessel for performing offshore drilling and/or other wellbore related activities, e.g. well intervention. It will be appreciated that, when desired, the invention is also applicable to land based drilling installations.

[0214] The installation comprises a drilling tower 1 that is here embodied as a mast with a closed contoured steel structure with at least one firing line 5 outside of the mast itself. For example the mast is arranged adjacent a moonpool of a drilling vessel, or over a larger moonpool with two firing lines along opposed outer faces of the mast 1 as is known in the art.

[0215] In an alternative design the drilling tower is embodied as a derrick with the firing line within the structure of derrick, e.g. the derrick having a lattice structure placed over the moonpool.

[0216] FIG. 1 shows a drill floor 2 having a well center 3, e.g. with a slip device 8a,b (here two devices that can travel over associated track into and out of the firing line) arranged at said location, through which a drilling tubulars string 4 can pass along a firing line 5.

[0217] The mast 1 is at the side of the drill floor 2 provided with two parallel vertical trolley rails 6, 7. A trolley 10 is guided along the trolley rails 6, 7.

[0218] A top drive device 30 is attached to the trolley 10.

[0219] The top drive device 30 comprises in this example four electric top drive motors 31, 32, 33, 34 which commonly drive, via gearbox or transmission housing 35, a rotary stem or quill 36. As known in the art the quill 36 is connectable, e.g. via a threaded connection, e.g. via a saver sub, to the top end of a drilling tubular aligned with the firing line. Thereby the top drive device 30 is able to impart rotary motion and drive torque to a drilling tubulars string.

[0220] A main hoisting device 50 is provided that is adapted to move the trolley with the top drive device up and down along the vertical trolley rails 6,7.

[0221] For example the frame of the trolley and hoisting device 50 have sufficient strength and capacity to handle a load of 1000 tons or more in the firing line.

[0222] A left-hand motion arm rail 60 and a right-hand motion arm rail 61 are present on opposed lateral sides of a vertical path of travel of the trolley 10 with the top drive device 30 along said the vertical trolley rails 6,7.

[0223] On each of said motion arm rails 60, 61 at least one, here three as is preferred, motion arm assembly 70, 71, 72, 80, 81, 82 is arranged. Each assembly is, as preferred independently controlled from any other assembly on the same rail 60, 61, vertically mobile along the respective rail by a respective motion arm assembly vertical drive.

[0224] As depicted there are two tubulars storage racks 110, 120, each along a respective side of the mast 10. These racks 110, 120 are each adapted to store multi-joint tubulars, here triples 9 (about 36 meter), therein in vertical orientation.

[0225] It is illustrated that two of the motion arm assemblies 71, 72, 81, 82 on each vertical rail 60, 61 are equipped with a tubular gripper. The height of the rails 60, 62 is at least such that the upper assembly 72, 82 can be arranged to grip the tubular in the storage rack 110, 120 at an appropriately high location.

[0226] The motion arm assemblies with grippers can be operated in unison to act as part of the tubular racker device allowing to transfer drilling tubulars stands, e.g. drill pipe or casing pipe or other drilling tubulars between the firing line 5 and the respective storage rack 110, 120.

[0227] As can be seen in FIGS. 1-3 the trolley 10 has a rigid frame structure with upper and lower trolley beams 11, 12 that each have at each end thereof rollers engaging the respective trolley rail 6, 7 on the mast 1. These beams 11, 12 here have about a V-shape in top view. These beams 11, 12 support here a single vertical rear frame member 13, that embodies sort of a spine of the trolley 10 and that spans the height between the beams 11, 12.

[0228] This rear frame member 13 is provided with one or more, here a pair of parallel, vertical guide rails 13a, b. The top drive device 30 is provided with a chassis 30a with rollers 30b or other guide members that cooperate with said guide rails 13a, b.

[0229] This rear frame member 13 may be embodied as a box girder.

[0230] From the top end of said rear frame member 13 a forward cantilevered frame member 14 extends, away from the mast 1. At its forward end this frame member 14 carries a transverse horizontal top frame member 16, generally in a transverse imaginary plane that encompasses the firing line 5.

[0231] The top frame member 16 is provided with connectors, here holes, for connecting thereto a series of cable sheaves 51 in a side by side arrangement. The mast 1, as a crown block, is also provided with cable sheaves 52 so that the trolley 10 is suspended by one or more winch driven cables in a multiple fall arrangement.

[0232] The trolley frame further comprises first and second frame or link members 17, 18 which are suspended from the transverse horizontal top frame member in a transverse plane that encompasses the firing line. As depicted these members 17, 18 are directly and pivotally connected to the frame member 16, here pivotal about an axis perpendicular to said transverse plane. As is preferred each member 17, 18 has an upper eye, as here through two spaced apart tabs, with a pin being secured through said eye and through a hole in the frame member 16.

[0233] The frame of the trolley further comprises a rotatable head clamp assembly carrier 19, which is connected, as is preferred releasably, to lower ends of said first and second members 17, 18.

[0234] As discussed the vertical guide rails 13a,b guide the top drive device 30 as the rollers 30b of the chassis 30a ride along said rails 13a, b.

[0235] In this embodiment, as preferred, the same guide rails 13a,b also guide the carrier 19, here a guidance portion 19a thereof. Also, as preferred, the same guide rails 13a, b guide the wrench and/or clamping device 190, which will be discussed later.

[0236] In addition to guiding said components, the one or more guide rails 13a, b here, as is preferred, also serve the purpose of absorbing any reaction torque that is caused by operation of the installation on the respective component and transmit said torque to the frame of the trolley 10.

[0237] Between the top drive device 30 and the trolley frame there are one or more vertical displacement actuators 40 so that the top drive device 30 is vertically mobile relative to the frame by said one or more vertical displacement actuators, here adapted to perform controlled lowering and raising of the top drive device during make up or breaking of the threaded connection between the quill or rotary stem on the one hand and the tool joint or box member of the tubular suspended from the rotatable head clamp assembly on the other hand.

[0238] The trolley is provided with an auxiliary hoisting device 130 that is adapted to vertically move at least the top drive device 30, here also the device 190, relative to the frame. It is depicted that the device 130 includes a chain hoist device, with a hook that can be coupled to either the top drive chassis 30a or the device 190 as shown in FIG. 3.

[0239] Reference numeral 190 indicates a wrench and/or clamp device that allows to retain the tool joint or box member held by the assembly 160 when make-up or break-up of a threaded connection is performed.

[0240] The carrier 19 supports, here is integrated with, a rotatable head clamp assembly 140 of which an example is depicted in FIGS. 4, 5a-c. For example the rotatable head clamp assembly 140 is designed to handle a firing line load of at least 1000 tons.

[0241] With reference to FIGS. 4, 5a-c, an embodiment of the rotatable head clamp 140 will be discussed.

[0242] The head clamp 140 here comprises: [0243] a rotary open-centered body 141 defining a vertical passage 141a in line with a firing line A to allow passage of a pipe of the drill string, e.g. a special sub fitted to the top end of the drill string; [0244] a thrust bearing 143 supporting the rotary body 141, allowing rotation thereof under the full load of the drilling tubulars string hanging in the wellbore; [0245] multiple mobile retainers 142 supported by the rotary body 141 so as to provide an operative and a non-operative mode of the rotatable head clamp.

[0246] In the shown embodiment, the rotatable head clamp comprises a housing 149 supporting the thrust bearing 143, which housing is supported by the carrier 19. Alternatively, the carrier 19 support the head clamp 140 directly via the thrust bearing 143. Either way, the carrier 19 absorbs the load of the suspended drill string.

[0247] Here, the rotary body is embodied as a cylinder 141b with a flanged top end 141a supporting the mobile retainers 142. The thrust bearing 143 supports the flanged top end 41a of the rotary body.

[0248] Furthermore, in the shown embodiment, an additional radial load bearing 144 is provided at the bottom end of the rotary body 141. A bearing connection 149a, which is a static frame part optionally integrated with housing 149, connects the thrust bearing 143 at the upper side of the rotary open-centered body with bearing 144 at the bottom end thereof.

[0249] In the shown embodiment, the carrier 19 furthermore supports a centralizer 152 below the head clamp 140 to centralize the drill string. Such centralizers are known in the art.

[0250] Retainers 142 are movable between a non-operative position and an operative position. In the non-operative position (not shown) the retainers 142 allow passage of a pipe of the drill string, e.g. a special sub fitted to the drill string, through the pipe passage 141a. In the operative position as shown in FIG. 4, the retainers 142 engage below a shoulder 15c of the tool joint or box portion 15b of a pipe, e.g. special sub, extending through the passage 141a so as to suspend said drill string therefrom.

[0251] In the shown embodiment, the mobile retainers 142 each have a jaw 142a to engage on a pipe, which is preferably an exchangeable jaw, e.g. to be able to match the diameter and/or shape to the type of pipe.

[0252] In FIGS. 5a-c a possible embodiment of a head clamp is shown in top view, a perspective top view and a side view. This head clamp is provided with two sets each three mobile retainers 142 and 142 respectively. Each set is adapted to retain a different type of pipe. This is advantageous as it is possible to have one set in the non-operative position and the other in the operative position.

[0253] The mobile retainers 142, 142 of FIG. 4 and FIG. 5 are embodied as a lever comprising an arm and a fulcrum, which fulcrum 142c is fixed to the rotary body, here flange 141a. One end 142a of the arm is adapted toin the operative positionengage on the pipe. Here, this end 142a of the arm is provided with clamping jaws 142d. In the non-operative position has cleared the area in line with the pipe passage to allow the passage of a pipe of the drill string. The other end 142b of the arm is operable by an actuator 146 to move the opposite end of the arm between the operative and the non-operative position. Here, the actuator 146 is embodied as a hydraulically operable finger engaging on the arm end 142b.

[0254] In FIG. 6 a part of the installation of FIG. 1 is depicted.

[0255] The drill floor is denoted with 2. Recessed in the drill floor provision is made for two slip devices 8a, b that can be selectively aligned with the well center 3 through which the firing line extends.

[0256] Along opposed sides of the slip device there is a pair of floor rails 2a, 2b on the drill floor over which a cart 150 can be moved into position over the well center 3.

[0257] As can be seen the cart 150, and possibly also other carts that are to be positioned over the well center in this invention, has a straddling structure with a top structure 151 embodied to support one or more of the mentioned components, here the carrier 19 with the rotatable head clamp 140, and with a raised straddle frame, e.g. that has a height of at least 2 meters above the drill floor 2.

[0258] In FIG. 22 it is depicted schematically that the cart 150 with raised straddle frame has a top structure that supports component 19 with head clamp assembly 140. It is illustrated that the slip device 8a supports a drilling tubular 15 so that a so-called stick-up end portion 15a thereof extends above the drill floor, e.g. over a height of at least 1 meter. The cart 150 is high enough to be arranged in the well center, over this stick-up portion.

[0259] To the left thereof FIG. 22 depicts a low version of a cart 180, that can e.g. be used to transport tall components, like the well intervention structural frame component 400 that will be described in more detail with reference to FIGS. 20, 21.

[0260] FIG. 6 depicts that the trolley 10 has been lowered so that the carrier 19 with head clamp 140 is brought to rest on the cart 150.

[0261] FIG. 7 depicts that the first and second link members 17, 18 are released from the carrier 19 resting on the cart 150. This is easily done here as the link members 17, 18 are pivotal outwards so as to disengage hook portions 19b, c of the carrier 19 from the respective lower eye or aperture of the link member 17,18.

[0262] In FIG. 7, as preferred, it can be seen that the carrier 19 has a guidance portion 19c that is engaged with the guide rails 13a, b on the trolley frame, e.g. to absorb any reaction torque and or to keep the head clamp 140 aligned with the firing line 5.

[0263] In FIG. 8 it is depicted that the trolley 10 is hoisted, so that the carrier guidance portion 19a slides from the guide rails 13a, b of the trolley frame.

[0264] FIG. 9 depicts that the cart 150 with the carrier 19 and head clamp 140 resting thereon is moved away from the well center 3.

[0265] Now the wrench and/or clamp device 190 has to be removed, as it is independently mounted to the frame below the top drive unit 30.

[0266] FIG. 10 depicts that a cart 160 is brought into position over the well center 3.

[0267] In FIG. 11 it can be seen that the trolley frame 10 is lowered so that the rails 13a, b thereof end just above or at the level of the cart 160.

[0268] After disconnecting any cables and/or hoses from the wrench and/or clamp device 190, this device 190 is lowered along the frame member 13 by means of the auxiliary hoisting device 130 until it comes to rest on the cart 160.

[0269] FIG. 12 depicts that the trolley 10 is lifted in order to disengage the wrench and/or clamp device from the rails of the trolley.

[0270] In FIG. 13 it is depicted that the cart 160 with the wrench and/or clamp device 190 thereon is moved away from the well center 3.

[0271] In FIG. 14 it is depicted that cart 170 has been moved over the well center 3, underneath the top drive device still in the frame of the trolley 10.

[0272] It is also depicted that any IBOP(s), saver subs, etc. present on the quill 36 have now been removed, prior to making the top drive device 30 to land on the cart 170.

[0273] The trolley 10 has been lowered so that so that the vertical guide rails 13a, b thereof end just above or at the level of the cart 170.

[0274] After having disconnected electrical cables, (mud) hoses, etc. from the top drive device 30, and disconnecting the actuator(s), the auxiliary hoisting device 130 is employed to lower the top drive device 30 along the frame member 13 and to land said top drive device 30 on the cart 170 as shown in FIG. 15.

[0275] The FIG. 16 depicts that once the top drive device 30 has been brought to rest on the cart 170, the trolley 10 is hoisted to cause the top drive device guide members to become disengaged from the vertical guide rails 13a, b on the frame of trolley 10.

[0276] Now, as depicted in FIG. 17, the cart 170 with the top drive device 30 thereon can be moved away from the firing line 5, e.g. to a remote maintenance location, e.g. to a workshop onboard the vessel.

[0277] It will be appreciated that a spare or repaired top drive device, or another top drive device, can be installed in the trolley in the reverse manner.

[0278] FIG. 18 depicts an alternative trolley 310.

[0279] The trolley 310 is provided with a rigid frame 350 that supports the top drive device 30. Generally in the depicted preferred embodiment the frame 350 forms a rigid loop in a central vertical plane through the firing line 5 and perpendicular to the adjacent side of the mast and/or the plane through the rails 60, 61.

[0280] The frame 350 has a top frame member 351 that is suspended from one or more winch driven cables of the hoisting device 50. Here, as preferred, the top frame member 351 carries multiple travelling sheaves 51 in a side-by-side arrangement, with the sheaves 51 having a common, horizontal, axis of rotation. The one or more hoisting cables extend between these travelling sheaves 51 and sheaves of the crown block, from which the one or more cables pass to one or more winches (not shown). As is preferred a heave compensation mechanism is provided that acts on the one or more cables to afford heave compensation of the trolley 10 and the attached top drive device 30.

[0281] The frame comprises a releasable carrier 352, spaced below the top frame member 351, that is connected via a front frame member 353 and a rear frame member 354 to the top frame member 351.

[0282] As schematically shown it is provided for that the carrier 352 can be released from the lower end of the members 353, 354 in order to move the carrier, and the rotatable head clamp 140, away from underneath the top drive device 30.

[0283] The carrier 352 here extends perpendicular to the axis of rotation of the multiple sheaves 51 on the top frame member. This embodiment is e.g. advantageous in combination with a top drive device wherein two vertical axis electrical top drive motors 331 are arranged underneath a gearbox or transmission housing 333, e.g. a left-hand motor and a right-hand motor as shown.

[0284] The housing 333 is guided along the frame members 353, 354, e.g. by guide rails thereon, e.g. also absorbing reaction torque of the drive motors 331.

[0285] Here these motors 331, 332 arein vertical projectionon opposed sides of the lower frame member 352.

[0286] The top drive device 30 is mounted within the frame 350 so as to be vertically mobile relative to the frame by one or more vertical displacement actuators, e.g. adapted to perform controlled lowering and raising of the top drive device during make up or breaking of the threaded connection between the quill 334 or rotary stem on the one hand and the tool joint or box member of the tubular suspended from the rotatable head clamp assembly 140 on the other hand.

[0287] The frame of the trolley and hoisting device 50 preferably have sufficient strength and capacity to also handle a weight of a subsea riser string when appropriate. For example a riser lifting tool can be attached to the vertical frame members 18, 19; 353, 354, e.g. after removal of the carrier 19, 352 and then attached to said vertical frame members.

[0288] It will be appreciated in general, that with the carrier 19, 352 removed other components may become suspended from the first and second vertical frame members of the trolley frame.

[0289] It will also be appreciated that, if desired, a common elevator device may be attached to the carrier 19, 352, e.g. for handling tubulars that are to be supplied by a catwalk machine.

[0290] FIG. 19 illustrates in plan view the drilling tower 1 with trolley rails 6,7. The trolley has been left out this figure. Further one sees the drill floor 2 and a driller's cabin 22.

[0291] Near the tower 1, here at opposed sides of the tower 1, one or more storage devices 110, 120 for storage of tubular stands are present. Here (as in FIG. 1) the storage devices 110, 120 are embodied as storage carrousels as is known in the art.

[0292] FIG. 19 also depicts racker devices 71, 72, 81, 82 that are embodied to move tubular stands between the tubular storage devices 110, 120 and the firing line 5. These racker devices may comprise multiple motion arm assemblies, e.g. a set of two above one another for each storage device 110, 120, wherein each motion arm assembly comprises a telescopic motion arm carrying a gripper, wherein said motion arm assemblies are movable over a respective vertical rail mounted on the tower 1. This arrangement is known in the art.

[0293] FIG. 19 illustrates that the rails 2a, 2b form a first cart rail section including a pair of parallel cart rails 2a, 2b passing along the well center of the drill floor. It is illustrated that a second cart rail section with parallel rails 2c, 2d is orthogonal to the first cart rail section, e.g. to extend along the mast 1. For example said first cart rail section extends transverse to the hull of a monohull drilling vessel and the second cart rail section extends along a side of the hull.

[0294] A further section of cart rails 2e, 2f is also depicted. By providing a grid of orthogonal cart rail sections, carts can be transported to various locations remote from the drill floor 2, e.g. to storage and/or maintenance locations for the various components.

[0295] FIG. 20 depicts schematically a tall and heavy well intervention structural frame component 400. As can be seen best in FIG. 21 this component 400 is adapted to be suspended from the trolley 10, in particular from the first and second vertical frame members 17, 18 thereof. In this example the component 400 has at its top end two hooks 401, 402 that are to be fitted into the eye of the respective member 17, 18.

[0296] For clarity FIG. 20 only shows part of the trolley 10.

[0297] The well intervention component 400 has a multistory structural frame that is provided with a coiled tubing injector 410, a wireline unit 420, and with associated pressure control devices 430, 440 at a lower level of the structural frame. For example the injector 410 and unit 420 are translatable between a position aligned with the firing line 5 and a remote non-operative position within the structural frame. Similarly the device 430, 440 may be embodied translatable or otherwise mobile between a non-operative position and a position aligned with the firing line 5.

[0298] FIG. 21 depicts that a tall firing line component, e.g. with a multistory structural frame as in the component 400, can be transported by means of a cart, in particular a skid cart 180 over rails 2a, b on the drill floor to a position underneath the trolley 10. Then the frame members 17, 18 of the trolley can be connected to the component 400 and the component lifted from the cart 180 that is then moved to a remote location.

[0299] For example with a well intervention component it may be envisaged that the main hoisting device is operated in heave compensation mode, so that the component, e.g. with coiled tubing injector, moves up and down along the tower to counteract the sea state induced motion of an offshore drilling vessel on which the tower 1 is arranged.