Composite heave compensation device and adjusting method

Abstract

The invention provides a composite heave compensation device which comprises a drilling mechanism arranged on a drilling platform, and the drilling mechanism comprises a traveling block arranged in a derrick, a drill column concentrically arranged in the traveling block and a large hook arranged in the traveling block and located above the drill column. The heave compensation mechanisms are symmetrically arranged on the two sides of the traveling block, and each heave compensation mechanism comprises a winch, a hydraulic cylinder set arranged between the traveling block and the winch, and a steel wire rope fixedly connected with the winch and the large hook and connected with the hydraulic cylinder set in series.

Description

Technical Field

[0001] The invention relates to the field of offshore oil drilling and production, and in particular to a composite heave compensation device and an adjustment method. Background Art

[0002] At present, the existing active heave compensation devices at home and abroad are mainly divided into three types, namely, the heave compensation device installed on the overhead crane, the heave compensation device installed between the traveling block and the big hook, and the heave compensation device installed on the dead rope. However, the heave compensation device installed on the overhead crane requires a special overhead crane and derrick, which has problems such as complex structure, large and complex derrick, inconvenient maintenance, and high cost; the heave compensation device installed between the traveling block and the big hook has a short compensation stroke, and the compensation effect will be affected under complex wave conditions. It cannot be applied to complex working environments and has low work efficiency; the heave compensation device installed on the dead rope is installed on the overhead crane pulley, and is also restricted by the compensation amplitude and cannot be applied to complex working environments. In addition, the above three types are installed on the derrick, and are restricted by the size of the space, so it is impossible to install a larger device to increase the compensation stroke to adapt to more complex marine working environments.

[0003] Therefore, it is desired in the art to provide a composite heave compensation device to solve the above technical problems. Summary of the invention

[0004] The purpose of the present invention is to provide a composite heave compensation device, which not only increases the compensation stroke but also can more easily meet more complex working environments through a composite compensation working mode composed of a hydraulic cylinder group and a winch. In addition, the present invention can also selectively control the hydraulic cylinder group and the winch according to different heave amplitudes of the drilling platform to ensure that the heave compensation work for the drill string can be carried out smoothly.

[0005] According to a first aspect of the present invention, there is provided a composite heave compensation device, comprising a drilling mechanism arranged on a drilling platform, the drilling mechanism comprising a traveling block arranged in a derrick, a drill string arranged concentrically in the traveling block, and a large hook arranged in the traveling block and above the drill string.

[0006] A pair of heave compensation mechanisms are symmetrically arranged on both sides of the traveling block, and the heave compensation mechanism includes a winch, a hydraulic cylinder group arranged between the traveling block and the winch, and a steel wire rope fixedly connected to the winch and the big hook respectively and arranged in series with the hydraulic cylinder group.

[0007] In one embodiment, the hydraulic cylinder group includes a gantry, a plurality of hydraulic legs spaced apart from each other and arranged in the gantry, and a hydraulic pulley fixedly connected to the hydraulic legs via a pulley frame.

[0008] The steel wire rope is wound around the hydraulic pulley, and the hydraulic support leg is configured to allow the drill string to perform heave and sink movements by adjusting the position of the steel wire rope, thereby causing the drill string to remain stationary relative to the oil well.

[0009] In one embodiment, slide grooves are provided on both sides of the pulley frame, and guide rails adapted to the slide grooves are provided on the inner wall of the gantry.

[0010] In one embodiment, the compound heave compensation device also includes a pulley group, which includes a first pulley arranged on the drilling platform and located between the gantry and the traveling block, a second pulley fixed on the gantry and located between the first pulley and the hydraulic pulley, and a third pulley arranged on the drilling platform and located between the winch and the hydraulic pulley.

[0011] In one embodiment, the steel wire rope is connected in series in sequence to the first pulley, the second pulley, the hydraulic pulley and the third pulley.

[0012] In one embodiment, the composite heave compensation device further includes a first sensor for recording the lifting and lowering speed of the drilling platform, and a second sensor for recording the stress condition of the large hook.

[0013] In one embodiment, the composite heave compensation device further includes a PLC controller connected to the first sensor and the second sensor respectively, and the PLC controller is configured to determine the heave amplitude of the drilling platform based on the monitoring data of the first sensor and the second sensor.

[0014] In one embodiment, the PLC controller is connected to the winch and the hydraulic cylinder group respectively, and the PLC controller is configured to selectively control the hydraulic cylinder group and the winch according to different heave amplitudes.

[0015] According to a second aspect of the present invention, there is provided a method for adjusting the composite heave compensation device as described above, comprising the following steps:

[0016] S1, determining the heave amplitude of the drilling platform through the PLC controller;

[0017] S2. Selectively controlling the hydraulic cylinder group and the winch according to different heave amplitude ranges to adjust the position and / or length of the wire rope, thereby causing the drill string to remain stationary relative to the oil well.

[0018] In one embodiment, step S2 further includes:

[0019] When the heave amplitude of the drilling platform is less than level 2 sea waves, the winch does not participate in the heave compensation adjustment work, and the PLC controller controls the hydraulic cylinder group to work;

[0020] When the heave amplitude of the drilling platform is in the range of 2 to 4 sea waves, the hydraulic cylinder group is self-locked, and the PLC controller controls the winch to work;

[0021] When the heave amplitude of the drilling platform is greater than level 4 sea waves, the PLC controller controls the winch and the hydraulic cylinder to work simultaneously.

[0022] Compared with the prior art, the advantages of the present invention are:

[0023] First, the present invention adopts a composite compensation working mode composed of a hydraulic cylinder group and a winch, which not only increases the compensation stroke but also can more easily meet more complex working environments. In addition, the present invention can also selectively control the hydraulic cylinder group and the winch according to the different heave amplitudes of the drilling platform to ensure that the heave compensation work for the drill string can be carried out smoothly. In this way, not only can energy consumption be effectively saved and compensation accuracy be improved, but also the working time of the hydraulic cylinder group and the winch can be effectively shortened, further achieving the purpose of reducing wear and extending service life.

[0024] Secondly, the device can be directly installed on the offshore drilling platform and is easy to maintain, and has a large adjustment and installation space, so it is not restricted by the space limit of the derrick. In addition, the device can load larger equipment according to the needs of use to further improve the compensation efficiency and compensation stroke. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be described in detail below in conjunction with the accompanying drawings, in which:

[0026] Figure 1 The structure of the composite heave compensation device according to the present invention is schematically shown;

[0027] Figure 1a for Figure 1 A partial view of the hydraulic cylinder group in the middle, which shows the matching relationship between the sliding frame and the gantry;

[0028] Figure 2 A schematic diagram of the distribution of a composite heave compensation device according to the present invention;

[0029] Figure 3 The structure of the hydraulic cylinder group in the composite heave compensation device according to the present invention is schematically shown;

[0030] Figure 4 FIG. 1 is a diagram showing the winding distribution of the steel wire rope in the composite heave compensation device according to the present invention.

[0031] Figure 5 for Figure 4 A partial view showing the installation position of the first pulley;

[0032] Figure 6 is a control flow chart of the adjustment method according to the present invention.

[0033] In the drawings, the same reference numerals are used for the same components. The drawings are not drawn to scale. DETAILED DESCRIPTION

[0034] In order to make the technical solutions and advantages of the present invention more clearly understood, the exemplary embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than an exhaustive list of all the embodiments. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0035] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0036] In the present invention, unless otherwise clearly stipulated and limited, terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal connection of two elements.

[0037] For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] The present invention will be further described below in conjunction with the accompanying drawings.

[0039] Figure 1 The structure of a composite heave compensation device 100 according to the present invention is schematically shown.

[0040] Figure 2 Schematic diagram of the distribution of the composite heave compensation device 100 according to the present invention.

[0041] like Figure 1 and 2As shown, according to a first aspect of the present invention, a composite heave compensation device 100 is provided, which mainly includes a drilling mechanism and a heave compensation mechanism. Preferably, the drilling mechanism and the heave compensation mechanism are both arranged on a drilling platform 10, and the drilling mechanism is located in the middle of the drilling platform 10, and a pair of heave compensation mechanisms are provided, and the two heave compensation mechanisms are symmetrically arranged on both sides of the drilling mechanism.

[0042] In one embodiment, Figure 1 As shown, the drilling mechanism includes a traveling block 21, a drill string 22 and a hook 23 arranged in the derrick. The drill string 22 is arranged concentrically in the traveling block 21, and the drill string 22 can go deep into the seabed for drilling operations. The hook 23 is arranged concentrically in the traveling block 21, and the hook 23 is above the drill string 22. However, the hook 23 can connect the wire rope 32 (described below) with the drill string 22, so that the drill string 22 can perform heave and sink motion under the driving action of the wire rope 32, which is described below.

[0043] Preferably, a pulley system is provided on the top of the traveling block 21, so that the wire rope 32 can connect the big hook 23 and the drill string 22 together through the pulley system to ensure that the two can achieve synchronous movement.

[0044] In one embodiment, Figure 1 As shown, the heave compensation mechanism includes a winch 31, a hydraulic cylinder group 40 and a wire rope 32. The hydraulic cylinder group 40 is arranged between the traveling block 21 and the winch 31, and the two ends of the wire rope 32 are fixedly connected to the winch 31 and the hook 23, respectively. Preferably, the wire rope 32 and the hydraulic cylinder group 40 are connected in series, so that the hydraulic cylinder group 40 and the winch 31 can more easily control the wire rope 32, so as to further drive the drill string 22 to do heave movement by adjusting the position and / or length of the wire rope 32, thereby ensuring that the drill string 22 can always maintain a relatively static state with the oil field, thereby ensuring that the drilling operation is carried out efficiently and safely.

[0045] In the present invention, the wire rope 32 can sequentially connect the hook 23, the hydraulic cylinder group 40 and the winch 31 in series, so the wire rope 32 can be controlled by both the hydraulic cylinder group 40 and the winch 31. In other words, the device can selectively control the hydraulic cylinder group 40 and the winch 31 according to the heave and sink conditions of the drilling platform 10 at sea to adjust the position and / or length of the wire rope 32, thereby smoothly completing the heave and sink compensation adjustment work of the drill string 22.

[0046] Figure 3 The structure of the hydraulic cylinder group 40 in the compound heave compensation device according to the present invention is schematically shown;

[0047] In one embodiment, Figure 3As shown, the hydraulic cylinder group 40 includes a gantry 41, a hydraulic leg 42 and a hydraulic pulley 43. The hydraulic leg 42 is a common hydraulic mechanism, and includes a hydraulic cylinder and a piston rod that can realize reciprocating motion. A plurality of hydraulic legs 42 arranged in parallel are provided in the gantry 41, and the hydraulic pulley 43 is fixed to the bottom of the hydraulic leg 42 through a pulley frame 44. Preferably, the gantry 41 includes a main frame 412 and four side support legs 413 arranged vertically on the main frame 412, wherein the hydraulic leg 42 is connected to the main frame 412 by pins, and adjacent side support legs 413 are reinforced by a cross-shaped support frame.

[0048] Preferably, in the present invention, three inverted and parallel hydraulic legs 42 are provided to improve the control capability of the wire rope 32 and further ensure that the heave compensation adjustment of the drill string 22 can be smoothly performed. In addition, at least two limit plates 421 for limiting the hydraulic legs 42 are provided in the gantry 41. In other words, the hydraulic legs 42 pass through the limit plates 421 and can only move axially under the action of the limit plates 421.

[0049] In the present invention, the wire rope 32 is wound around the hydraulic pulley 43, so the pulley frame 44 and the hydraulic pulley 43 can reciprocate along the axial direction under the pushing action of the hydraulic support leg 42, so that the longitudinal position of the contact part between the wire rope 32 and the hydraulic pulley 43 can be more easily adjusted, and the axial position of the drill string 22 can be further adjusted to ensure that the drill string 22 can remain relatively stationary with the oil field.

[0050] Preferably, during the above adjustment process, the drill string 22 can more easily perform heave compensation work under the driving action of the wire rope 32, so as to ensure that the drill string 22 can always remain relatively still with the oil well when affected by the marine environment, further reducing the impact on the bottom hole drilling pressure to ensure the normal drilling operation.

[0051] In the present invention, the length of the steel wire rope 32 can be changed by arranging the rope by the winch 31, thereby adjusting the axial position of the drill string 22 to ensure that the drill string 22 can remain relatively still with the oil field. Preferably, in this adjustment mode, the drill string 22 can do heave and sink motion under the driving action of the steel wire rope 32, so as to ensure that the drill string 22 can always remain relatively still with the oil well when affected by the marine environment, further reducing the impact on the bottom hole drilling pressure to ensure the normal drilling operation. Preferably, the winch 31 includes a winch drum, and the present invention completes the rope arrangement work of the steel wire rope 32 by the winch drum.

[0052] Figure 1a for Figure 1 A partial view of the hydraulic cylinder group in the middle, which shows the matching relationship between the sliding frame and the gantry;

[0053] In one embodiment, Figure 1a As shown, a riveted plate is provided on the side support leg 413. Preferably, a slide groove 441 is provided on both sides of the pulley frame 44, and a guide rail 411 adapted to the slide groove 441 is provided on the inner wall of the gantry 41 (specifically, on the riveted plate). It is easy to understand that under the cooperation of the slide groove 441 and the guide rail 411, the pulley frame 44 can move up and down in the vertical direction. In this way, it can be ensured that the hydraulic support leg 42 is only subjected to the axial force, thereby improving its adjustment ability of the wire rope 32, and further ensuring that the heave compensation work for the drill string 22 can be carried out smoothly.

[0054] Figure 4 is a rope winding distribution diagram of the steel wire rope 32 in the composite heave compensation device according to the present invention;

[0055] Figure 5 for Figure 4 A partial view of the structure showing the installation position of the first pulley.

[0056] According to the present invention, the composite heave compensation device 100 further comprises a pulley block. Figure 4 and 5 As shown, preferably, the pulley block includes a first pulley 51 and a second pulley 52. ​​In the present invention, the first pulley 51 is arranged on the drilling platform 10, and the first pulley 51 is between the gantry 41 and the traveling block 21; and the second pulley 52 is arranged on the drilling platform 10, and the second pulley 52 is between the first pulley 51 and the hydraulic pulley 43. Therefore, under the action of the first pulley 51 and the second pulley 52, the wire rope 32 can be smoothly pulled from the big hook 23 to the hydraulic pulley 43.

[0057] like Figure 5 As shown, the present invention takes into account that the wire rope 32 may swing left and right when the winch 31 is arranging the rope, so the pulley block also includes a third pulley 53 disposed on the drilling platform 10 and located between the winch 31 and the hydraulic pulley 43. Preferably, a rotating pulley frame 531 is also provided on the drilling platform 10, and the third pulley 53 is fixed on the rotating pulley frame 531. Therefore, if the wire rope 32 swings left and right during the process of the winch 31 arranging the rope, the adjusting function of the rotating pulley frame 531 can ensure that the wire rope 32 entering the hydraulic pulley 43 can maintain a stable working state.

[0058] The series relationship of the steel wire rope 32 in the present invention is as follows, that is, the steel wire rope 32 is led out from the big hook 23, and is fixedly connected to the winch 31 after passing through the pulley system, the first pulley 51, the second pulley 52, the hydraulic pulley 43 and the third pulley 53 in sequence. When performing heave compensation work on the drill string 22, the length of the steel wire rope 32 can be adjusted by the winch 31 alone, the position of the steel wire rope 32 can be adjusted by the hydraulic cylinder group 40 alone, and the steel wire rope 32 can also be adjusted by the winch 31 and the hydraulic cylinder group 40 at the same time.

[0059] According to the present invention, Figure 2 As shown, the composite heave compensation device 100 further includes a first sensor 101 and a second sensor 102. Preferably, the first sensor 101 can monitor and record the heave motion of the drilling platform 10 in real time, that is, obtain the speed and acceleration data of the ascent and descent of the drilling platform 10 in real time. The second sensor 102 can monitor and record the force condition of the hook 23 in real time, that is, record the load condition of the hook 23 in real time.

[0060] According to the present invention, the composite heave compensation device 100 further includes a PLC controller 103 connected to the first sensor 101 and the second sensor 102, respectively. In the present invention, the PLC controller 103 can receive data information recorded from the first sensor 101 and the second sensor 102, respectively, and can determine the heave amplitude of the drilling platform 10 according to the acquired data information, so as to help accurately select the adjustment method for the wire rope 32. Preferably, the adjustment method includes three different working methods of using the hydraulic cylinder group 40 alone, using the winch 31 alone, and using the hydraulic cylinder group 40 and the winch 31 at the same time.

[0061] In the present invention, the PLC controller 103 is connected to the winch 31 and the hydraulic cylinder group 40 respectively. Therefore, the PLC controller 103 can selectively control the hydraulic cylinder group 40 and the winch 31 according to different heave amplitudes, thereby adjusting the position and / or length of the wire rope 32 to ensure that the heave compensation work of the drill string 22 can be carried out smoothly.

[0062] The specific adjustment process of the present invention is specifically introduced below:

[0063] When the heave amplitude of the drilling platform 10 is less than level 2 sea waves (i.e., small sea waves), the heave amplitude of the drilling platform 10 is within 0.5m, and the winch 31 does not participate in the heave compensation work, and only the hydraulic cylinder group 40 participates in the heave compensation work to cope with this situation. Preferably, when the drilling platform 10 descends, the hydraulic support leg 42 moves downward and adjusts the position of the wire rope 32 through the hydraulic pulley 43, so that the drill string 22 rises relative to the drilling platform 10; when the drilling platform 10 rises, the hydraulic support leg 42 moves upward and adjusts the position of the wire rope 32 through the hydraulic pulley 43, so that the drill string 22 descends relative to the drilling platform 10.

[0064] When the heave amplitude of the drilling platform 10 is in the range of 2 to 4 waves (i.e., medium-amplitude waves), the heave amplitude of the drilling platform 10 is in the range of 0.5 to 2.5 m, the hydraulic cylinder group 40 is self-locked and does not participate in the heave compensation work, and only the winch 31 participates in the heave compensation work to cope with this situation. Preferably, when the drilling platform 10 is descending, the winch 31 drives the winch drum to retract the wire rope 32 so that the drill string 22 rises relative to the drilling platform 10; when the drilling platform 10 rises, the winch 31 drives the winch drum to retract and discharge the wire rope 32 so that the drill string 22 descends relative to the drilling platform 10.

[0065] When the heave amplitude of the drilling platform 10 is greater than level 4 sea waves (i.e., large sea waves), the heave amplitude of the drilling platform 10 is above 2.5m. Since the amplitude of the drilling platform 10 and the force on the hook 23 will increase sharply, in order to ensure that the drilling work can be carried out safely and efficiently, the hydraulic cylinder group 40 and the winch 31 will work simultaneously to enhance the adjustment ability of the wire rope 32, and further ensure that the heave compensation work for the drill string 22 can be carried out smoothly. The working mode of the hydraulic cylinder group 40 and the winch 31 has been introduced above and will not be repeated here.

[0066] Preferably, the present invention adopts a composite compensation working mode composed of the hydraulic cylinder group 40 and the winch 31, thereby not only increasing the compensation stroke but also being able to more easily meet more complex working environments. In addition, the present invention can also selectively control the hydraulic cylinder group 40 and the winch 31 according to different heave amplitudes to ensure that the heave compensation work for the drill string 22 can be carried out smoothly. In this way, energy consumption can be effectively saved, thereby reducing the working time of the hydraulic cylinder group 40 and the winch 31, and further improving the service life of the composite heave compensation device 100.

[0067] Figure 6 is a control flow chart of the adjustment method according to the present invention.

[0068] Combine the following Figure 6 The process of heave compensation working of the present invention is introduced as follows:

[0069] Firstly, the heave and sink movement of the drilling platform 10 is monitored and recorded in real time through the first sensor 101, that is, the speed and acceleration data of the rising and falling of the drilling platform 10 are obtained in real time; the force condition of the big hook 23 can be monitored and recorded in real time through the second sensor 102, that is, the load condition of the big hook 23 is recorded in real time.

[0070] Then, the PCL controller 103 receives the data information recorded by the first sensor 101 and the second sensor 102 respectively, and can determine the heave amplitude of the drilling platform 10 according to the acquired data information.

[0071] Afterwards, an adjustment method is selected according to the heave amplitude of the drilling platform 10 . In the case of small waves, that is, the heave amplitude of the drilling platform 10 is less than level 2 waves, the heave amplitude of the drilling platform 10 is within 0.5m, the winch 31 does not participate in the heave compensation work, and only the hydraulic cylinder group 40 participates in the heave compensation work to cope with this situation; in the case of medium waves, that is, the heave amplitude of the drilling platform 10 is between level 2 and level 4 waves, and the heave amplitude of the drilling platform 10 is within the range of 0.5 to 2.5m, the hydraulic cylinder group 40 is self-locked and does not participate in the heave compensation work, and only the winch 31 participates in the heave compensation work to cope with this situation; in the case of large waves, that is, the heave amplitude of the drilling platform 10 is greater than level 4 waves, and the heave amplitude of the drilling platform 10 is above 2.5m, the hydraulic cylinder group 40 and the winch 31 work simultaneously to enhance the adjustment ability of the wire rope 32, and further ensure that the heave compensation work for the drill string 22 can be carried out smoothly.

[0072] Finally, the PCL controller 103 determines whether the working state of the drill string 22 is stable. If it is stable, the heave compensation work is completed. If it is unstable, the judgment and adjustment are performed again according to the data information recorded by the first sensor 101 and the second sensor 102.

[0073] According to a second aspect of the present invention, there is provided a regulation method using the composite heave compensating device 100 as described above, comprising the following steps:

[0074] First, the heave motion of the drilling platform 10 and the force of the hook 23 are recorded by the first sensor 101 and the second sensor 102 respectively, and the heave amplitude of the drilling platform 10 is determined by the PLC controller 103;

[0075] Then, the working mode of the wire rope 32 is selectively controlled and adjusted according to different heave amplitudes, thereby ensuring that the drill string 22 can always remain stationary relative to the oil well.

[0076] Preferably, the selection of the adjustment method for the steel wire rope 32 and the corresponding working process are as follows:

[0077] In the case of small waves, that is, the heave amplitude of the drilling platform 10 is less than level 2 waves, at this time, the heave amplitude of the drilling platform 10 is within 0.5m, the winch 31 does not participate in the heave compensation work, and only the hydraulic cylinder group 40 participates in the heave compensation work to cope with this situation. Preferably, when the drilling platform 10 descends, the hydraulic support leg 42 moves downward and adjusts the position of the wire rope 32 through the hydraulic pulley 43 to make the drill string 22 rise relative to the drilling platform 10; when the drilling platform 10 rises, the hydraulic support leg 42 moves upward and adjusts the position of the wire rope 32 through the hydraulic pulley 43 to make the drill string 22 descend relative to the drilling platform 10.

[0078] In the case of medium-amplitude sea waves, that is, the heave amplitude of the drilling platform 10 is in the range of 2 to 4 sea waves, at this time, the heave amplitude of the drilling platform 10 is in the range of 0.5 to 2.5m, the hydraulic cylinder group 40 is self-locked and does not participate in the heave compensation work, and only the winch 31 participates in the heave compensation work to cope with this situation. Preferably, when the drilling platform 10 descends, the winch 31 drives the winch drum to retract the wire rope 32, so that the drill string 22 rises relative to the drilling platform 10; when the drilling platform 10 rises, the winch 31 drives the winch drum to retract and discharge the wire rope 32, so that the drill string 22 descends relative to the drilling platform 10.

[0079] In the case of large waves, that is, the heave amplitude of the drilling platform 10 is greater than level 4 waves, the heave amplitude of the drilling platform 10 is above 2.5m. Since the amplitude of the drilling platform 10 and the force on the big hook 23 will increase sharply, in order to ensure that the drilling work can be carried out safely and efficiently, the hydraulic cylinder group 40 and the winch 31 will work simultaneously to enhance the adjustment ability of the wire rope 32, and further ensure that the heave compensation work for the drill string 22 can be carried out smoothly.

[0080] During this adjustment process, when the drilling platform 10 descends, the hydraulic support leg 42 moves downward and adjusts the position of the wire rope 32 through the hydraulic pulley 43, and at the same time, the winch 31 drives the winch drum to retract the wire rope 32, so that the drill string 22 rises relative to the drilling platform 10; and when the drilling platform 10 rises, the hydraulic support leg 42 moves upward and adjusts the position of the wire rope 32 through the hydraulic pulley 43, and the winch 31 drives the winch drum to retract and discharge the wire rope 32, so that the drill string 22 descends relative to the drilling platform 10.

[0081] Compared with the prior art, the advantages of the present invention are:

[0082] First, the present invention adopts a composite compensation working mode composed of the hydraulic cylinder group 40 and the winch 31, which not only increases the compensation stroke but also can more easily meet more complex working environments. In addition, the present invention can also selectively control the hydraulic cylinder group 40 and the winch 31 according to the different heave amplitudes of the drilling platform 10 to ensure that the heave compensation work for the drill string 22 can be carried out smoothly. In this way, not only can energy consumption be effectively saved and compensation accuracy be improved, but also the working time of the hydraulic cylinder group 40 and the winch 31 can be effectively shortened, further achieving the purpose of reducing wear and extending service life.

[0083] Secondly, the device can be directly installed on the offshore drilling platform and is easy to maintain, and has a large adjustment and installation space, so it is not restricted by the space limit of the derrick. In addition, the device can load larger equipment according to the needs of use to further improve the compensation efficiency and compensation stroke.

[0084] The above are only preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art can easily make changes or modifications within the disclosure scope of the present invention, and such changes or modifications should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A composite heave compensation device, comprising: A drilling mechanism is arranged on a drilling platform (10), the drilling mechanism comprising a traveling block (21) arranged in a derrick, a drill string (22) arranged concentrically in the traveling block (21), and a large hook (23) arranged in the traveling block (21) and above the drill string (22). A pair of heave compensation mechanisms are symmetrically arranged on both sides of the traveling carriage (21), the heave compensation mechanism comprising a winch (31), a hydraulic cylinder group (40) arranged between the traveling carriage (21) and the winch (31), and a steel wire rope (32) respectively fixedly connected to the winch (31) and the large hook (23) and arranged in series with the hydraulic cylinder group.

2. The composite heave compensation device according to claim 1, characterized in that: The hydraulic cylinder group comprises a gantry (14), a plurality of hydraulic legs (42) arranged in the gantry (41) and spaced apart from each other, and a hydraulic pulley (43) fixedly connected to the hydraulic legs (42) via a pulley frame (44). The steel wire rope (32) is wound around the hydraulic pulley (43), and the hydraulic support leg (42) is configured to adjust the position of the steel wire rope (32) to allow the drill string (22) to rise and fall, thereby causing the drill string (22) to remain stationary relative to the oil well.

3. The composite heave compensation device according to claim 2, characterized in that: Slide grooves (441) are provided on both sides of the pulley frame (44), and guide rails (411) adapted to the slide grooves (441) are provided on the inner wall of the gantry frame (41).

4. The composite heave compensation device according to claim 3, characterized in that: The composite heave compensation device further comprises a pulley block, the pulley block comprising a first pulley (51) arranged on the drilling platform (10) and located between the gantry (41) and the traveling block (21), a second pulley (52) fixed on the gantry (41) and located between the first pulley (51) and the hydraulic pulley (43), and a third pulley (53) arranged on the drilling platform (10) and located between the winch (31) and the hydraulic pulley (43).

5. The composite heave compensation device according to claim 4, characterized in that: The steel wire rope (32) is sequentially connected in series to the first pulley (51), the second pulley (52), the hydraulic pulley (43) and the third pulley (53).

6. The composite heave compensation device according to claim 1, characterized in that: The composite heave compensation device also includes a first sensor (101) for recording the lifting and lowering speed of the drilling platform (10), and a second sensor (102) for recording the force condition of the large hook (23).

7. The composite heave compensation device according to claim 6, characterized in that: The composite heave compensation device further comprises a PLC controller (103) respectively connected to the first sensor (101) and the second sensor (102), wherein the PLC controller (103) is configured to determine the heave amplitude of the drilling platform (10) based on monitoring data of the first sensor (101) and the second sensor (102).

8. The composite heave compensation device according to claim 7, characterized in that: The PLC controller (103) is connected to the winch (31) and the hydraulic cylinder group respectively, and the PLC controller (103) is configured to selectively control the hydraulic cylinder group and the winch (31) according to different heave amplitudes.

9. A method of adjustment, using the composite heave compensation device according to any one of claims 1 to 8, comprising the following steps: S1. determining the heave amplitude of the drilling platform (10) through the PLC controller (103); S2. Selectively controlling the hydraulic cylinder group and the winch (31) according to different heave amplitudes to adjust the position and / or length of the steel wire rope (32), thereby causing the drill string (22) to remain stationary relative to the oil well.

10. The adjustment method according to claim 9, characterized in that: Step S2 also includes: When the heave amplitude of the drilling platform (10) is less than level 2 sea waves, the winch (31) does not participate in the heave compensation adjustment work, and the PLC controller (103) controls the hydraulic cylinder group to work; When the heave amplitude of the drilling platform (10) is in the range of sea waves of level 2 to 4, the hydraulic cylinder group is self-locked, and the PLC controller (103) controls the winch (31) to operate; When the heave amplitude of the drilling platform (10) is greater than level 4 sea waves, the PLC controller (103) controls the winch (31) and the hydraulic cylinder to work simultaneously.

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