Downhole tool winch wave compensation device for floating drilling platform

Abstract

The present invention discloses a wave compensation device for a downhole tool winch of a floating drilling platform, comprising a main hull structure, a drill platform support structure is arranged on the upper side of the main hull structure, a drill platform structure is arranged on the upper side of the drill platform support structure, a drill string compensation device is arranged on the upper side of the drill platform structure, watertight pipe tensioning devices are arranged at both ends of the drill platform structure, a turntable is arranged at the center of the drill platform structure, a fixed eye plate and four guide rollers are arranged at the two ends of the outer side of the turntable, a large hook is arranged at the end of the drill string compensation device, a tensioning wire rope fixed pulley is hung on the lower side of the large hook, a tensioning wire rope is connected to the fixed eye plate, and the tensioning wire rope passes through the tensioning wire rope fixed pulley and the four guide rollers to be connected to the watertight pipe tensioning ring. The downhole tool winch wave compensation device of the present invention realizes the wave compensation of the winch with a simple structure, which greatly reduces the construction cost and use cost of the platform.

Description

Technical Field

[0001] The invention relates to the technical field of ship and marine engineering oil and gas drilling and production, in particular to a downhole tool winch wave compensation device for a floating drilling platform. Background Art

[0002] Drilling platforms are the main equipment for the early development of offshore oil and gas resources. Especially in the drilling process of medium and deep waters, it is necessary to overcome the impact of ocean waves on drilling and downhole measurement, coring and other operations. Therefore, floating drilling platforms (including drilling ships) need to be equipped with equipment with wave compensation function. During offshore drilling, downhole tools (including downhole measurement tools, coring tools, salvage tools, etc.) need to be placed into the wellbore through downhole tool winches (including logging winches, logging winches, coring winches, etc.). Since floating drilling platforms are affected by waves and drift and heave, the tools placed in the wellbore will move up and down. In order to ensure that the downhole tools remain in the same position relative to the wellhead, the downhole tool winch needs to have a wave compensation function, or wave compensation of the downhole tool winch can be achieved by other means. The drilling platform has high requirements for equipment weight control, and the total amount of equipment should be minimized. Summary of the invention

[0003] The purpose of the present invention is to provide a wave compensation device for a downhole tool winch of a floating drilling platform to solve the problem proposed in the above background technology that the floating drilling platform is affected by waves and produces drift and heave, and the downhole tool placed in the wellbore will move up and down accordingly. In order to ensure that the downhole tool can maintain an unchanged position relative to the wellhead, the downhole tool winch is required to have a wave compensation function, or the wave compensation of the downhole tool winch can be achieved by other means. The drilling platform has high requirements for equipment weight control and the total amount of equipment should be reduced as much as possible.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A downhole tool winch wave compensation device for a floating drilling platform comprises a main hull structure, a drill floor support structure is arranged on the upper side of the main hull structure, a drill floor structure is arranged on the upper side of the drill floor support structure, a drill string compensation device is arranged on the upper side of the drill floor structure, watertight pipe tensioning devices are arranged at both ends of the drill floor structure, a turntable is arranged at the center of the drill floor structure, a fixed eye plate and four guide rollers are respectively arranged at the outer ends of the turntable, a large hook is arranged at the end of the drill string compensation device, a tensioning wire rope fixed pulley is suspended at the lower side of the large hook, a tensioning wire rope is connected to the fixed eye plate, and the tensioning wire rope passes through the tensioning wire rope fixed pulley and the guide four rollers to be connected to the watertight pipe tensioning ring.

[0006] Furthermore, the fixed eye plate and the four guide rollers are symmetrically arranged along the central axis of the turntable, and the fixed eye plate and the four guide rollers are installed close to the center of the turntable.

[0007] Furthermore, a downhole tool winch wire rope fixed pulley is suspended at the lower side of the tensioning wire rope fixed pulley, and the tensioning wire rope fixed pulley and the downhole tool winch wire rope fixed pulley are connected via a 360-degree rotating shackle.

[0008] Furthermore, a downhole tool winch wire rope is arranged outside the downhole tool winch wire rope fixed pulley, one end of the downhole tool winch wire rope is connected to the downhole tool winch, and the other end of the downhole tool winch wire rope passes through the turntable and is connected to the downhole tool.

[0009] Furthermore, a riser expansion joint is provided on the outside of the downhole tool, a riser tensioning ring is provided on the upper side of the riser expansion joint, a tensioner wire rope is provided on the outside of the riser tensioning ring, and both ends of the tensioner wire rope pass through the tensioner guide wheels and are connected to the riser tensioning devices at both ends of the drilling platform structure.

[0010] Furthermore, the drill string compensation device and the drilling platform structure are fastened to each other via a derrick.

[0011] Furthermore, there is an angle between the surface formed by the tensioning steel wire rope and the tensioning steel wire rope fixed pulley and the surface formed by the downhole tool winch steel wire rope and the downhole tool winch steel wire rope fixed pulley.

[0012] Furthermore, the fixed eye plate is connected to the tensioning wire rope through a shackle, and the fixed eye plate is embedded in the structure outside the turntable.

[0013] Furthermore, the tensioner guide wheels are symmetrically arranged at two ends of the bottom of the drilling platform structure along the central axis of the turntable.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The wave compensation device for the downhole tool winch realizes the wave compensation function of the downhole tool winch by adding a tensioning wire rope fixed pulley, a downhole tool winch wire rope fixed pulley, a guide four-roller, a tensioning wire rope, and combining the existing drill string compensation device and the watertight pipe tensioning device of the drilling platform. The wave compensation of the downhole tool winch is realized without the need to configure the automatic compensation function of the downhole tool winch itself. The downhole tool winch wave compensation device not only saves the manufacturing cost of the downhole tool winch, but also reduces the weight center of gravity of the platform, as well as the power demand of the downhole tool winch for the platform, thereby reducing energy consumption, and is easy to operate. The downhole tool winch wave compensation device described in the present invention realizes the wave compensation of the winch with a simple structure, greatly reducing the construction cost and use cost of the platform. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1It is a schematic diagram of the overall structure of the present invention;

[0017] In the figure: 1. drill string compensation device, 2. derrick, 3. big hook, 4. fixed pulley for tensioning wire rope, 5. fixed pulley for wire rope of downhole tool winch, 6. fixed eye plate, 7. tensioning wire rope, 8. turntable, 9. guide four rollers, 10. downhole tool winch, 11. downhole tool winch wire rope, 12. tensioner guide wheel, 13. tensioner wire rope, 14. riser tensioning ring, 15. downhole tool, 16. riser expansion joint, 17. riser tensioning device, 18. drilling platform structure, 19. drilling platform support structure, 20. main hull structure. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in 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. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] See also Figure 1 , the present invention provides a technical solution:

[0020] A downhole tool winch wave compensation device for a floating drilling platform comprises a main hull structure 20, a drill platform support structure 19 is arranged on the upper side of the main hull structure 20, a drill platform structure 18 is arranged on the upper side of the drill platform support structure 19, a drill string compensation device 1 is arranged on the upper side of the drill platform structure 18, watertight pipe tensioning devices 17 are arranged at both ends of the drill platform structure 18, a turntable 8 is arranged at the center of the drill platform structure 18, a fixed eye plate 6 and a guide four-roller 9 are respectively arranged at the outer ends of the turntable 8, a large hook 3 is arranged at the end of the drill string compensation device 1, a tensioning wire rope fixed pulley 4 is suspended at the lower side of the large hook 3, a tensioning wire rope 7 is connected to the fixed eye plate 6, and the tensioning wire rope 7 passes through the tensioning wire rope fixed pulley 4 and the guide four rollers 9 to be connected to the watertight pipe tensioning ring 14.

[0021] In the present invention, the fixed eye plate 6 and the four guide rollers 9 are symmetrically arranged along the central axis of the turntable 8 , and the fixed eye plate 6 and the four guide rollers 9 are installed close to the center of the turntable 8 .

[0022] In the present invention, a downhole tool winch wire rope fixed pulley 5 is suspended below the tensioning wire rope fixed pulley 4, and the tensioning wire rope fixed pulley 4 and the downhole tool winch wire rope fixed pulley 5 are connected via a 360-degree rotating shackle.

[0023] In the present invention, a downhole tool winch wire rope 11 is arranged outside the downhole tool winch wire rope fixed pulley 5, one end of the downhole tool winch wire rope 11 is connected to the downhole tool winch 10, and the other end of the downhole tool winch wire rope 11 passes through the turntable 8 and is connected to the downhole tool 15.

[0024] In the present invention, a riser expansion joint 16 is arranged on the outside of the downhole tool 15, a riser tensioning ring 14 is arranged on the upper side of the riser expansion joint 16, a tensioner wire rope 13 is arranged on the outside of the riser tensioning ring 14, and both ends of the tensioner wire rope 13 pass through the tensioner guide wheel 12 and are connected to the riser tensioning device 17 at both ends of the drilling platform structure 18.

[0025] In the present invention, the drill string compensation device 1 and the drilling platform structure 18 are fastened together via the derrick 2 .

[0026] In the present invention, there is an angle between the surface formed by the tensioning steel wire rope 7 and the tensioning steel wire rope fixed pulley 4 and the surface formed by the downhole tool winch steel wire rope 11 and the downhole tool winch steel wire rope fixed pulley 5 .

[0027] In the present invention, the fixed eye plate 6 is connected to the tensioning wire rope 7 through a shackle, and the fixed eye plate 6 is embedded in the structure outside the rotating disk 8.

[0028] In the present invention, the tensioner guide wheels 12 are symmetrically arranged at two ends of the bottom of the drilling platform structure 18 along the central axis of the rotary table 8 .

[0029] Working principle:

[0030] When the device is working, the riser tensioning device 17 of the drilling platform itself is in working state, and the drill string compensation device 1 is also in working state.

[0031] The downhole tool winch wire rope 11 connected to the outside of the downhole tool winch 10 lowers the downhole tool 15 into the wellbore through the downhole tool winch wire rope fixed pulley 5. When the main hull floats up due to the influence of waves, the tensioner wire rope 13 of the riser tensioning device 17 will extend as the hull rises to ensure that the distance between the riser tensioning ring 14 and the seabed remains unchanged. The riser expansion joint 16 above the riser tensioning ring 14 will be elongated accordingly, but because the length of the tensioning wire rope 7 is fixed, The tensioning wire rope fixed pulley 4 and the downhole tool winch wire rope fixed pulley 5 will move downward due to the pulling force. Since the drill string compensation device 1 is in working state at this time, the drill string compensation device 1 will automatically move the big hook 3 downward and keep the tension of the tensioning wire rope 7 unchanged. Therefore, the downhole tool winch wire rope fixed pulley 5 will automatically move downward. At this time, even if the downhole tool winch 10 is in the braking state, the downhole tool 15 will automatically move downward relative to the drilling platform structure 18 and keep the relative position with the seabed unchanged. On the contrary, when the hull sinks due to the influence of waves, the downhole tool 15 automatically moves upward relative to the drilling platform structure 18 to achieve the wave automatic compensation function of the downhole tool winch 10.

[0032] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-limiting from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any reference numerals in the claims should not be regarded as limiting the claims involved.

[0033] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A floating drilling platform downhole tool winch wave compensation device, comprising a main hull structure (20), a drilling platform support structure (19) is arranged on the upper side of the main hull structure (20), and a drilling platform structure (18) is arranged on the upper side of the drilling platform support structure (19), characterized in that: A drill string compensation device (1) is arranged on the upper side of the drilling platform structure (18), and watertightening pipe tensioning devices (17) are arranged at both ends of the drilling platform structure (18). A turntable (8) is arranged at the center of the drilling platform structure (18), and a fixed eye plate (6) and a guide four roller (9) are arranged at the two ends of the outer side of the turntable (8), respectively. A large hook (3) is arranged at the end of the drill string compensation device (1), and a tensioning wire rope fixed pulley (4) is suspended on the lower side of the large hook (3). A tensioning wire rope (7) is connected to the fixed eye plate (6), and the tensioning wire rope (7) passes through the tensioning wire rope fixed pulley (4) and the guide four rollers (9) to be connected to the watertightening pipe tensioning ring (14); A downhole tool winch wire rope fixed pulley (5) is suspended at the lower side of the tensioning wire rope fixed pulley (4), and the tensioning wire rope fixed pulley (4) and the downhole tool winch wire rope fixed pulley (5) are connected via a 360-degree rotating shackle; A downhole tool winch wire rope (11) is arranged outside the downhole tool winch wire rope fixed pulley (5), one end of the downhole tool winch wire rope (11) is connected to the downhole tool winch (10), and the other end of the downhole tool winch wire rope (11) passes through the rotary table (8) and is connected to the downhole tool (15); A riser expansion joint (16) is arranged on the outside of the downhole tool (15), a riser tensioning ring (14) is arranged on the upper side of the riser expansion joint (16), a tensioner wire rope (13) is arranged on the outside of the riser tensioning ring (14), and both ends of the tensioner wire rope (13) pass through the tensioner guide wheel (12) and are connected to the riser tensioning device (17) at both ends of the drilling platform structure (18).

2. The floating drilling platform downhole tool winch wave compensation device according to claim 1, characterized in that: The fixed eye plate (6) and the four guide rollers (9) are respectively arranged symmetrically along the central axis of the turntable (8), and the fixed eye plate (6) and the four guide rollers (9) are installed close to the center of the turntable (8).

3. The floating drilling platform downhole tool winch wave compensation device according to claim 1, characterized in that: The drill string compensation device (1) and the drilling platform structure (18) are fastened together via a derrick (2).

4. The floating drilling platform downhole tool winch wave compensation device according to claim 1, characterized in that: There is an angle between the surface formed by the tensioning steel wire rope (7) and the tensioning steel wire rope fixed pulley (4) and the surface formed by the downhole tool winch steel wire rope (11) and the downhole tool winch steel wire rope fixed pulley (5).

5. The floating drilling platform downhole tool winch wave compensation device according to claim 1, characterized in that: The fixed eye plate (6) is connected to the tensioning wire rope (7) via a shackle, and the fixed eye plate (6) is embedded in the structure outside the rotating disk (8).

6. The floating drilling platform downhole tool winch wave compensation device according to claim 1, characterized in that: The tensioner guide wheels (12) are symmetrically arranged at two ends of the bottom of the drilling platform structure (18) along the central axis of the turntable (8).

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