Drilling system

Abstract

The present invention belongs to the field of marine drilling technology and discloses a drilling system, which includes a drilling platform, a drilling assembly, a drill coring assembly, a rope coring assembly, and a gas lift reverse circulation coring assembly. A derrick is provided on the drilling platform; the drilling assembly includes a top drive and a drill rod group, the top drive is provided on the derrick, the drill rod group is connected to the output end of the top drive, and the top drive drives the drill rod group to move along the center line of the derrick; the drill coring assembly, the rope coring assembly, and the gas lift reverse circulation coring assembly are all provided on the drilling platform and can be selectively connected to the drilling assembly respectively, so that the drilling system can switch between a drill coring mode, a rope coring mode, and a gas lift reverse circulation coring mode. The drilling system is equipped with a variety of coring processes, which can meet the coring operation requirements in various environments such as shallow waters or deep seas, and effectively improve the operation efficiency.

Description

Technical Field

[0001] The present invention relates to the field of ocean drilling technology, and in particular to a drilling system. Background Art

[0002] Currently, ocean exploration and development are becoming more frequent. In order to obtain more information about the seabed strata, more cores need to be taken, especially in ocean scientific drilling, which requires full-hole coring.

[0003] Current riser construction technology limits operating depths to 3,000 meters. The drill-lift coring method, originally designed for offshore oil and gas exploration and development, is unable to meet the demands of coring in complex environments. This requires frequent extraction of the drill pipe from the hole, resulting in low drilling efficiency, difficulty re-entering the hole, and frequent drill pipe connections. Furthermore, deepwater drilling is challenging and has a limited operating window, making a single drill-lift coring method unsuitable for practical applications.

[0004] Therefore, a drilling system is urgently needed to solve the above-mentioned coring problem. Summary of the Invention

[0005] The purpose of the present invention is to provide a drilling system with multiple coring processes, which can meet the coring operation requirements in various environments such as shallow water or deep sea, and effectively improve the operation efficiency.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] Drilling system, including:

[0008] A drilling platform, wherein a derrick is provided on the drilling platform;

[0009] A drilling assembly, comprising a top drive and a drill rod group, wherein the top drive is arranged on the derrick, the drill rod group is connected to an output end of the top drive, and the top drive drives the drill rod group to move along the center line of the derrick;

[0010] A drill-lift coring assembly, a rope coring assembly and a gas-lift reverse circulation coring assembly are all arranged on the drilling platform and can be selectively connected to the drilling assembly to enable the drilling system to switch between a drill-lift coring mode, a rope coring mode and a gas-lift reverse circulation coring mode.

[0011] Optionally, the drilling platform includes a coring deck, a drilling deck and a stern pipe deck arranged in sequence along the bow and stern directions of the ship, the derrick is arranged on the drilling floor of the drilling deck, the center line of the derrick is coaxial with the center line of the wellhead on the drilling floor, the coring deck is flush with the drilling floor, and the drilling floor is higher than the stern pipe deck.

[0012] Optionally, two coring rat holes are opened on the side of the wellhead of the drilling platform close to the bow of the ship, and the two coring rat holes are symmetrically distributed along the center line of the wellhead parallel to the bow and stern direction of the ship. The drilling platform is also provided with a bow track, which is set on the side of the coring rat hole close to the bow of the ship and extends along the bow and stern direction of the ship.

[0013] Optionally, the drill lifting and coring assembly includes a coring device conveyor and a conveyor track. The conveyor track is detachably arranged on the drilling platform and connected to the head track. The coring device conveyor is arranged on the conveyor track. When the drilling system is in the drill lifting and coring mode, the coring device conveyor can move along the conveyor track and the head track to transfer the coring device between the coring rat hole and the ship core processing system.

[0014] Optionally, two coring rat holes are opened on a side of the wellhead of the drilling platform close to the bow portion, and the two coring rat holes are symmetrically distributed along a center line of the wellhead parallel to the bow and stern direction of the ship;

[0015] The rope coring assembly includes a coring winch, a rope and a salvage device. The coring winch is arranged on one side of the derrick. A center pulley is provided on the top of the derrick. The rope is wound around the center pulley. The two ends of the rope are respectively connected to the coring winch and the salvage device. When the drilling system is in the rope coring mode, the coring winch can drive the salvage device to move along the center line of the derrick through the rope, and can also drive the salvage device to move between the wellhead and the coring rathole through the rope.

[0016] Optionally, the drilling platform is further provided with a bow track, which is provided on a side of the coring rat hole close to the bow portion and extends along the bow-to-stern direction of the ship;

[0017] The rope coring assembly also includes a coring machine conveyor and a conveyor track. The conveyor track is detachably mounted on the drilling platform and connected to the head track. The coring machine conveyor is arranged on the conveyor track. The coring machine conveyor can move along the conveyor track and the head track to transfer the coring machine between the coring rat hole and the ship core processing system.

[0018] Optionally, the rope coring assembly further comprises a wire rope blowout preventer, and the wire rope blowout preventer is mounted on the upper end of the main shaft of the top drive.

[0019] Optionally, the gas lift reverse circulation coring assembly includes a core separation device, an air compressor, a dual-channel faucet and a reverse circulation flush pipe. When the drilling system is in the gas lift reverse circulation coring mode, the core separation device is detachably arranged on the drilling platform and is connected to the top end of the main shaft of the top drive through the reverse circulation flush pipe. The bottom end of the main shaft of the top drive is connected to the drill pipe group through the dual-channel faucet, and the air compressor is connected to the top end of the dual-channel faucet.

[0020] Optionally, the solid output end of the core separation device is communicated with a ship core processing system, and the liquid output end of the core separation device is communicated with a mud processing system.

[0021] Optionally, a catwalk machine and a catwalk machine track are also provided on the drilling platform. The catwalk machine track is located on the side of the derrick close to the stern of the ship and extends along the bow and stern direction of the ship. The catwalk machine is movably set on the catwalk machine track, and the catwalk machine is used to transmit drilling tools.

[0022] Beneficial effects of the present invention:

[0023] The drilling system provided by the present invention includes a drilling platform, a drilling assembly, a drill coring assembly, a rope coring assembly, and a gas lift reverse circulation coring assembly. A derrick is provided on the drilling platform, and the drilling assembly includes a top drive and a drill rod group. The top drive is provided on the derrick, and the drill rod group is connected to the output end of the top drive. The top drive drives the drill rod group to move along the center line of the derrick, thereby achieving drilling operations at the target location. At the same time, the drill coring assembly, the rope coring assembly, and the gas lift reverse circulation coring assembly are all provided on the drilling platform and can be selectively connected to the drilling assembly. That is, according to actual needs, the drilling assembly can be connected to the drill coring assembly, the rope coring assembly, and the gas lift reverse circulation coring assembly, respectively, so that the drilling system can switch between the drill coring mode, the rope coring mode, and the gas lift reverse circulation coring mode, thereby meeting the operational requirements of drilling and coring in different situations and effectively improving operational efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in describing the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without any creative work.

[0025] Figure 1 is a schematic structural diagram of a drilling system provided by an embodiment of the present invention;

[0026] Figure 2 is a cross-sectional view of a drilling system provided by an embodiment of the present invention;

[0027] Figure 3 is a top view of a drilling system provided by an embodiment of the present invention;

[0028] Figure 4 This is a schematic diagram of a drilling system provided by an embodiment of the present invention in an air lift reverse circulation coring mode.

[0029] In the picture:

[0030] 1. Drilling platform; 11. Derrick; 12. Coring deck; 131. Drilling floor; 132. Coring rathole; 133. Bow track; 134. Aft track; 135. Power rathole; 14. Aft pipe deck; 141. Catwalk; 142. Catwalk track;

[0031] 2. Drilling assembly; 21. Top drive; 22. Drill string; 23. Rotary table; 24. Iron roughneck; 25. Driller's cabin; 26. Hydraulic cathead; 27. Multifunctional manipulator; 28. Set box;

[0032] 3. Drilling and coring assembly; 31. Coring device conveyor; 32. Conveyor track;

[0033] 4. Rope coring assembly; 41. Coring winch; 42. Rope;

[0034] 5. Air lift reverse circulation coring assembly; 51. Core separation device; 52. Air compressor; 53. Dual-channel faucet; 54. Reverse circulation flushing pipe;

[0035] 61. Cementing manifold; 62. Mud riser manifold. DETAILED DESCRIPTION

[0036] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0039] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0040] In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0041] In the description of the present invention, it should be noted that, unless otherwise specified or limited, the terms "disposed" and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0042] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0043] In the present description, the term "and / or" is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in the present invention generally indicates that the related objects are in an "or" relationship.

[0044] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0045] This embodiment provides a drilling system, such as Figure 1 and Figure 2 As shown, it includes a drilling platform 1, a drilling assembly 2, a drill coring assembly 3, a rope coring assembly 4 and an air lift reverse circulation coring assembly 5.

[0046] The drilling platform 1 is provided with a derrick 11, and the drilling assembly 2 includes a top drive 21 and a drill rod assembly 22. The top drive 21 is provided on the derrick 11, and the drill rod assembly 22 is connected to the output end of the top drive 21. The top drive 21 drives the drill rod assembly 22 to move along the centerline of the derrick 11, thereby achieving drilling operations at the target location. At the same time, the drill coring assembly 3, the rope coring assembly 4, and the gas lift reverse circulation coring assembly 5 are all provided on the drilling platform 1 and can be selectively connected to the drilling assembly 2. In other words, according to actual needs, the drilling assembly 2 can be connected to the drill coring assembly 3, the rope coring assembly 4, and the gas lift reverse circulation coring assembly 5, respectively, so that the drilling system can switch between the drill coring mode, the rope coring mode, and the gas lift reverse circulation coring mode, thereby meeting the operational requirements of drilling and coring in different situations and effectively improving operational efficiency.

[0047] Specifically, the drilling platform 1 can be selected as a ship or other offshore operating platform. In this embodiment, the drilling platform 1 is a ship.

[0048] Continue to refer to Figure 1 Along the bow and stern directions of the ship, the drilling platform 1 includes a coring deck 12, a drilling deck and a stern pipe deck 14 arranged in sequence. The derrick 11 is set on the drilling floor 131 of the drilling deck. The centerline of the derrick 11 is coaxial with the centerline of the wellhead on the drilling floor 131, which is used to carry out drilling and coring related operations. The coring deck 12 is flush with the drilling floor 131. The coring deck 12 is used to process and assemble coring drill tools and connect with the ship's core processing system. The ship's core processing system can be located at the bow of the coring deck 12 or on the lower side of the coring deck 12 to detect and store cores. The drilling floor 131 is higher than the stern pipe deck 14, which is used to store tools such as laying drill pipes and watertight pipes.

[0049] like Figure 2 and Figure 3As shown, two coring rat holes 132 are provided on the side of the wellhead of the drilling platform 1 near the bow, and the two coring rat holes 132 are symmetrically distributed along the centerline of the wellhead parallel to the bow and stern direction of the ship. The coring rat holes 132 can be used to store the corer, so as to serve as a temporary storage tool during the period from when the corer is removed from the wellhead to when it is transferred to the ship's core processing system. Specifically, the coring rat holes 132 are arranged as close to the wellhead as possible and within the operating coverage of the pipe laying machine. The pipe laying machine can temporarily store the corer removed from the wellhead in the coring rat holes 132, and can also send the corer in the coring rat holes 132 to the wellhead position. The drilling platform 1 is also provided with a bow track 133, which is arranged on the side of the coring rat holes 132 near the bow and extends in the bow and stern direction.

[0050] Optionally, the drill and coring assembly 3 includes a coring conveyor 31 and a conveyor track 32. The conveyor track 32 is detachably mounted on the drilling platform 1 and connected to the head track 133. The coring conveyor 31 is mounted on the conveyor track 32. When the drilling system is in the drill and coring mode, the conveyor track 32 is mounted on the coring deck 12. The coring conveyor 31 can move along the conveyor track 32 and the head track 133 to transfer the coring device between the coring rathole 132 and the ship's core processing system. The coring conveyor 31 can temporarily store the delivered empty coring barrel in the coring rathole 132, and can also transport the coring device storing the core in the coring rathole 132 to the coring conveyor 31 for transportation.

[0051] Optionally, the wireline coring assembly 4 includes a coring winch 41, a wireline 42, and a reel. The coring winch 41 is mounted on one side of the derrick 11. A central pulley is located at the top of the derrick 11, around which a wireline 42 is wound. The ends of the wireline 42 connect the coring winch 41 and the reel, respectively. The reel is equipped with a locking mechanism that enables it to reel in the corer within the wellbore. When the drilling system is in wireline coring mode, the coring winch 41 uses the wireline 42 to move the reel along the centerline of the derrick 11. The wireline 42 also allows the reel to move between the wellhead and the coring rathole 132. Furthermore, a conveyor track 32 is mounted on the coring deck 12. The coring conveyor 31 is mounted on the conveyor track 32 and moves along the bow track 133 to transfer the corer between the coring rathole 132 and the vessel's core handling system.

[0052] Furthermore, the wireline coring assembly 4 also includes a wireline blowout preventer (BOP) mounted on the upper end of the main shaft of the top drive 21. If gas backflow occurs while the coring winch 41 is driving the rope 42 upward, the BOP can be closed to seal the rope and prevent gas from escaping the derrick 11.

[0053] More optionally, if Figure 1and Figure 4 As shown, the gas lift reverse circulation coring assembly 5 includes a core separator 51, an air compressor 52, a dual-channel faucet 53, and a reverse circulation flush pipe 54. The air compressor 52 is arranged on the rear pipe deck 14, and the core separator 51 is detachably mounted on the drilling platform 1. When the drilling system is in the gas lift reverse circulation coring mode, the core separator 51 is installed on the coring deck 12. The core separator 51 is connected to the top of the main shaft of the top drive 21 through the reverse circulation flush pipe 54. The bottom end of the main shaft of the top drive 21 is connected to the drill pipe group 22 through the dual-channel faucet 53, and the air compressor 52 is connected to the top of the dual-channel faucet 53. The core separator 51 is used to separate solids and liquids from the fluid returning from the well.

[0054] Specifically, the solids output of the core separator 51 is connected to the vessel's core processing system, while the liquid output of the core separator 51 is connected to the mud processing system. In other words, the liquid output of the core separator 51 is connected to a pre-buried mud processing pipeline within the vessel. After the core separator 51 separates the cores and seawater, the cores are collected on the coring deck 12, and the seawater is discharged to the mud processing system via a pre-buried mud processing pipeline.

[0055] Optionally, continue with reference to Figure 1-Figure 3 The drilling platform 1 also includes a moonpool, a main deck, and a moonpool elevation platform. The moonpool is located directly below the drill floor 131 and serves as a passageway connecting the drill floor 131 to the seafloor. The main deck is flush with the aft pipe deck 14. Left and right elevation platforms are installed within the moonpool, with the drill floor 131 elevated above the aft pipe deck 14. The drill floor 131 is also equipped with a rotary table 23, a roughneck 24, a power rathole 135, a driller's cabin 25 (control system), a hydraulic cathead 26, a cementing manifold 61, a mud riser manifold 62, a multi-function manipulator 27, and a root box 28. The derrick 11 is also equipped with a hoisting system, a finger beam, a pipe rack, and a salvage manipulator. The top drive 21 is equipped with different accessories depending on the coring mode. When using the drill lift coring mode or the rope coring mode, a wireline blowout preventer is installed on the upper portion of the hollow main shaft of the top drive 21. When the gas lift reverse circulation coring mode is used, the hollow main shaft of the top drive 21 is directly connected to the mud pipeline, and the mud pipe hose is connected to the core separation device 51 through the mud pipe hard pipe.

[0056] Optionally, the drilling platform 1 is also provided with a catwalk 141 and a catwalk track 142. Specifically, a tail track 134 is also provided on the drilling floor 131. The tail track 134 is arranged on the side of the coring rathole 132 near the stern of the ship and extends in the bow-stern direction. A catwalk platform is provided on the aft pipe deck 14. The catwalk platform is flush with the drilling floor 131, and the catwalk 141 and catwalk track 142 are arranged on the catwalk platform. The catwalk track 142 is connected to the aft track 134, and the catwalk 141 moves along the catwalk track 142 and the aft track 134 to transport drilling tools on the aft pipe deck 14 in and out of the drilling floor 131.

[0057] The two coring holes 132 in this embodiment are respectively designated as coring hole No. 1 132 and coring hole No. 2 132 . The operation steps of the drilling system provided in this embodiment in the drill-lift coring mode, the rope coring mode, and the gas-lift reverse circulation coring mode are as follows:

[0058] 1. When the drilling system is in the drill coring mode:

[0059] During the operation, the coring device to be used in the next step is placed in the No. 1 coring rat hole 132 in advance, and a drill rod is drilled into the well using drilling equipment so that the coring device in the well is filled with cores. Subsequently, the drill rod is brought out and placed in the root box 28, and the corer filled with cores is placed in the No. 2 coring rat hole 132. The corer pre-stored in the No. 1 coring rat hole 132 is immediately taken out, and the drill rod stored in the root box 28 is connected to start the next round of coring. Finally, the corer with cores stored in the No. 1 coring rat hole 132 is transported to the ship's core processing system on the drilling table 131 through the corer conveyor 31, and a new corer is placed in the No. 1 coring rat hole 132. Repeat the above steps to carry out the drilling and coring work.

[0060] 2. When the drilling system is in wireline coring mode:

[0061] During the operation, the corer needed for the next step is placed in advance in coring rathole 132. A drill pipe is drilled using the drilling equipment to fill the corer with core. The coring winch 41 is then activated, and the overshot at the end of the coring winch 41 is lowered to the bottom of the borehole via the wireline blowout preventer and the top drive 21, connecting the overshot to the corer. The coring winch 41 is then activated to retrieve the corer, now filled with core. If gas backflow occurs while the coring winch 41 drives the rope 42 upward, the wireline blowout preventer can be closed to seal the rope and prevent gas from escaping the derrick 11. The corer, now filled with core, is placed in coring rathole 132. The overshot at the end of the coring winch 41 is immediately connected to the pre-placed corer in coring rathole 132. This overshot is then lowered into the wellbore via the top drive 21, beginning the next round of coring. Finally, the corer with the core stored in the No. 1 coring rat hole 132 is transported to the ship core processing system via the corer conveyor 31 on the drilling floor 131, and a new corer is placed in the No. 1 coring rat hole 132. The above steps are repeated to carry out the rope 42 coring work.

[0062] 3. When the drilling system is in gas lift reverse circulation coring mode:

[0063] During operation, the high-pressure air compressor 52 is started and begins to deliver high-pressure gas. The gas enters the drill pipe annulus through the dual-channel faucet 53 at the bottom of the top drive 21 and mixes with the liquid in the drill pipe. Then, the core in the drill pipe is returned through the top drive 21 and the reverse circulation flushing pipe 54, and enters the core separation device 51 through the slag discharge pipeline. The core separation device 51 separates the core and collects it.

[0064] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A drilling system, characterized in that: include: A drilling platform (1), wherein a derrick (11) is provided on the drilling platform (1); A drilling assembly (2) comprising a top drive (21) and a drill rod group (22), wherein the top drive (21) is arranged on the derrick (11), the drill rod group (22) is connected to the output end of the top drive (21), and the top drive (21) drives the drill rod group (22) to move along the center line of the derrick (11); A drill-lift coring assembly (3), a rope coring assembly (4) and an air-lift reverse circulation coring assembly (5), wherein the drill-lift coring assembly (3), the rope coring assembly (4) and the air-lift reverse circulation coring assembly (5) are all arranged on the drilling platform (1) and are selectively connected to the drilling assembly (2) so that the drilling system can be switched between a drill-lift coring mode, a rope (42) coring mode and an air-lift reverse circulation coring mode; Two coring rat holes (132) are provided on a side of the wellhead of the drilling platform (1) close to the bow portion, and the two coring rat holes (132) are symmetrically distributed along a wellhead center line parallel to the bow and stern direction of the ship. A bow track (133) is also provided on the drilling platform (1), and the bow track (133) is provided on a side of the coring rat holes (132) close to the bow portion of the ship and extends along the bow and stern direction of the ship; The drill lifting and coring assembly (3) comprises a coring device conveyor (31) and a conveyor track (32). The conveyor track (32) is detachably arranged on the drilling platform (1) and connected to the head track (133). The coring device conveyor (31) is arranged on the conveyor track (32). When the drilling system is in the drill lifting and coring mode, the coring device conveyor (31) can move along the conveyor track (32) and the head track (133) to transfer the coring device between the coring rat hole (132) and the ship core processing system.

2. The drilling system according to claim 1, wherein: The drilling platform (1) comprises a coring deck (12), a drilling deck and a stern pipe deck (14) arranged in sequence along the bow and stern directions of the ship, the derrick (11) is arranged on a drilling floor (131) of the drilling deck, the centerline of the derrick (11) is coaxial with the centerline of a wellhead on the drilling floor (131), the coring deck (12) is flush with the drilling floor (131), and the drilling floor (131) is higher than the stern pipe deck (14).

3. The drilling system according to claim 1, wherein: The rope coring assembly (4) includes a coring winch (41), a rope (42) and a salvage device. The coring winch (41) is arranged on one side of the derrick (11). A central pulley is arranged on the top of the derrick (11). The rope (42) is wound around the central pulley. The two ends of the rope (42) are respectively connected to the coring winch (41) and the salvage device. When the drilling system is in the rope (42) coring mode, the coring winch (41) can drive the salvage device to move along the center line of the derrick (11) through the rope (42), and can also drive the salvage device to move between the wellhead and the coring rat hole (132) through the rope (42).

4. The drilling system according to claim 3, characterized in that The drilling platform (1) is further provided with a bow track (133), which is provided on a side of the coring rat hole (132) close to the bow portion and extends in a bow-stern direction. The rope coring assembly (4) further includes a coring device conveyor (31) and a conveyor track (32), wherein the conveyor track (32) is detachably mounted on the drilling platform (1) and connected to the head track (133), and the coring device conveyor (31) is mounted on the conveyor track (32). The coring device conveyor (31) is capable of moving along the conveyor track (32) and the head track (133) to transfer the coring device between the coring rat hole (132) and the ship core processing system.

5. The drilling system according to claim 4, characterized in that The rope coring assembly (4) further comprises a wire rope blowout preventer, which is mounted on the upper end of the main shaft of the top drive (21).

6. The drilling system according to claim 1, wherein: The gas lift reverse circulation coring assembly (5) includes a core separation device (51), an air compressor (52), a dual-channel faucet (53) and a reverse circulation flushing pipe (54). When the drilling system is in the gas lift reverse circulation coring mode, the core separation device (51) is detachably arranged on the drilling platform (1) and is connected to the top end of the main shaft of the top drive (21) through the reverse circulation flushing pipe (54). The bottom end of the main shaft of the top drive (21) is connected to the drill pipe group (22) through the dual-channel faucet (53), and the air compressor (52) is connected to the top end of the dual-channel faucet (53).

7. The drilling system according to claim 6, characterized in that The solid output end of the core separation device (51) is communicated with the ship core processing system, and the liquid output end of the core separation device (51) is communicated with the mud processing system.

8. The drilling system according to any one of claims 1 to 7, characterized in that: The drilling platform (1) is further provided with a catwalk machine (141) and a catwalk machine track (142). The catwalk machine track (142) is located on a side of the derrick (11) close to the stern portion and extends in the bow and stern direction. The catwalk machine (141) is movably provided on the catwalk machine track (142). The catwalk machine (141) is used to transport drilling tools.

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