Wave compensation well drilling winch device

Abstract

The invention discloses a wave compensation well drilling winch device, which belongs to the technical field of ocean drilling equipment and comprises a winch body, a monitoring unit and a control unit. The winch body comprises a first support, a winding drum, a steel wire rope, a first driving device and a safety protection device, the free end of the steel wire rope is wound around a fixed pulley on a drilling tower crown block and a movable pulley on a traveling pulley and then is connected with a dead line fixer fixedly arranged on a derrick, and a drill column is connected with the traveling pulley. The monitoring unit comprises a weight indicator. The control unit is used for calculating the actual bit pressure value of the drilling tool according to the detection value of the weight indicator, the control unit can compare the actual bit pressure value with the set bit pressure value, and the actual bit pressure value is made to be equal to the set bit pressure value by controlling the first driving device to adjust the rotating direction and / or the rotating speed of the winding drum according to the comparison result. The wave compensation effect is effectively improved, smooth drilling operation is guaranteed, and the method has good application prospects.

Description

Technical Field

[0001] The present invention relates to the technical field of marine drilling equipment, in particular to a wave compensation drilling winch device. Background Art

[0002] As land resources become increasingly depleted, human dependence on marine resources is deepening. In the water depth area of 2,000 to 6,000 meters, there are rich marine mineral resources such as methane hydrate, polymetallic nodules, hydrothermal deposits and cobalt crusts.

[0003] Drilling work to explore seabed geology is carried out onboard offshore drilling vessels. Deep-sea drilling winches, as key components of offshore drilling equipment, undertake important tasks such as implementing normal drilling, ensuring the lifting and lowering of drill tools, and extracting seabed samples. However, when operating, offshore drilling vessels are affected by waves and will produce six degrees of freedom of swaying motion around the original equilibrium position, including longitudinal, transverse, heave, pitch, roll, and yaw. In severe sea conditions, the violent movement of the mother ship causes large changes in the depth of the drill tools, and the wire rope is repeatedly impacted by strong and variable tension. The swaying and up-and-down heave of the hull will cause the watertight pipe system and drill string to move up and down, changing the bottomhole drilling pressure. In particular, when the drill bit is stuck, it is impossible to quickly lift the drill bit, which can easily damage the drilling equipment and affect the progress of the project.

[0004] Currently, there are two main types of wave compensation systems: active and passive. Passive wave compensation relies on accumulators to absorb the energy of the mother ship's heave and sink, requiring no external energy supply. However, it suffers from low compensation accuracy, unstable performance, and significant lag, making it only suitable for environments with relatively good sea conditions. Although active wave compensation can output control signals to control hardware operation for compensation when the drill string heave and sink motion is detected, it requires a lot of hardware and has lag, resulting in poor compensation results. On the one hand, the system structure is complex and is affected by mechanical friction and the interference characteristics of electronic components, resulting in severe nonlinearity. On the other hand, due to the large mass and inertia of the drill string, the compensation action only occurs after the load changes, resulting in a serious time lag. Summary of the Invention

[0005] The object of the present invention is to provide a wave compensation drilling winch device to solve the problems existing in the above-mentioned prior art and improve the wave compensation effect of the winch device.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] The present invention provides a wave compensation drilling winch device, comprising:

[0008] The winch body, the winch body includes a first bracket fixedly arranged on the hull, a drum rotatably installed on the first bracket, a wire rope partially wound on the drum, a first driving device for driving the drum to rotate, and a safety protection device installed on the first bracket. The safety protection device is used to brake the rotation of the drum. The free end of the wire rope is wound around a fixed pulley on the drilling derrick crown block and a movable pulley on the traveling block, and then connected to a dead line anchor fixedly arranged on the derrick. The drill string is connected to the traveling block;

[0009] The monitoring unit, the monitoring unit includes a weight indicator. The weight indicator includes a pressure sensor arranged on the dead line anchor. The pressure sensor is used to detect the tension of the wire rope;

[0010] The control unit is used to calculate the actual bit weight value of the drill string according to the detection value of the weight indicator. The control unit can compare the size of the actual bit weight value with the set bit weight value, and according to the comparison result, adjust the rotation direction and / or rotation speed of the drum by controlling the first driving device to make the actual bit weight value equal to the set bit weight value.

[0011] Preferably, the safety protection device includes a brake disc coaxially and fixedly connected with the drum, a safety clamp for clamping the brake disc, and a hydraulic station. The safety clamp is normally closed, and the hydraulic station is used to provide high-pressure oil to the safety clamp to make the safety clamp release the brake disc; the control unit can control the operation of the hydraulic station.

[0012] Preferably, the winch body further includes a rope arranging mechanism. The rope arranging mechanism includes a second bracket fixedly connected with the first bracket, a screw rod rotatably installed on the second bracket, a second driving device for driving the screw rod to rotate, a guide rod fixedly arranged on the second bracket, and a third bracket threadedly connected with the screw rod. The third bracket is slidably sleeved on the guide rod, and the wire rope is slidably matched with the third bracket; the control unit can control the operation of the second driving device; a first pulley and a second pulley are arranged on the third bracket. The axial direction of the guide rod, the axial direction of the screw rod, the axial direction of the first pulley, and the axial direction of the second pulley are respectively parallel to the axial direction of the drum, and the wire rope is wound around the first pulley and the second pulley.

[0013] Preferably, the monitoring unit further includes two tension sensors which are arranged on the third bracket at intervals along the axial direction of the drum. The tension sensors are in signal connection with the control unit. The interval between the two tension sensors is equal to the diameter of the wire rope. The first pulley and the second pulley are closer to the drum than any one of the tension sensors. After the wire rope winds around the first pulley and the second pulley, it passes through the interval between the two tension sensors.

[0014] Preferably, the control unit includes a PLC programmable controller, a CPU, a touch screen, and a data storage device. The weight indicator, the tension sensors, the PLC programmable controller, the touch screen, and the data storage device are respectively in signal connection with the CPU. The first driving device, the safety protection device, and the second driving device are respectively in signal connection with the PLC programmable controller.

[0015] Preferably, the control unit further includes a multi-functional operating lever which is in signal connection with the CPU.

[0016] Preferably, the CPU and the touch screen are arranged in the electric control room of the hull, and the PLC programmable controller, the touch screen, and the multi-functional operating lever are respectively arranged in the driller's cabin of the hull.

[0017] Preferably, the surface of the drum is provided with an anti-corrosion coating, and the material of the anti-corrosion coating is epoxy zinc-rich paint; ribas rope grooves are arranged on the drum.

[0018] Preferably, both the first driving device and the second driving device adopt permanent magnet synchronous motors.

[0019] Preferably, the monitoring unit further includes a rotational speed sensor for detecting the rotational speed of the output shaft of the first driving device.

[0020] The present invention has achieved the following technical effects compared with the prior art:

[0021] The wave compensation drilling winch device of the present invention obtains the tension of the wire rope by setting a weight indicator in the monitoring unit. The control unit calculates the actual drilling pressure value of the drill tool in real time according to the tension of the wire rope, and by comparing the size of the actual drilling pressure value with the set drilling pressure value, and according to the comparison result, adjusts the drum rotation direction and / or rotational speed by controlling the first driving device, so that the actual drilling pressure value is equal to the set drilling pressure value; this real-time adjustment method can more effectively compensate for the changes in the depth of the drill tool and the tension of the wire rope caused by waves compared with the problems of low passive wave compensation accuracy, hysteresis and non-linearity in active wave compensation in the prior art, thereby improving the wave compensation effect of the winch device, reducing the damage to the drilling equipment caused by wave influence, and ensuring the smooth progress of the drilling work.

[0022] Further, the safety protection device includes a brake disc fixedly connected coaxially with the drum, a normally-closed safety clamp, and a hydraulic station, and the control unit can control the operation of the hydraulic station. During normal operation, the hydraulic station supplies high-pressure oil to the safety clamp to release the brake disc, and the drum can rotate normally; when an abnormal situation occurs (such as sudden power failure when the hydraulic station and the control system cannot work), the safety clamp clamps the brake disc by the spring tension in the clamp body to brake the rotation of the drum, thereby realizing the safety protection of the winch device, avoiding safety accidents caused by equipment failures or abnormal situations, and ensuring the safety of drilling operations.

[0023] Further, the rope arranging mechanism includes a second bracket, a screw rod, a second driving device, a guide rod, and a third bracket, and the control unit can control the operation of the second driving device. By driving the screw rod to rotate through the second driving device, the third bracket that is threadedly connected with the screw rod and sleeved slidably on the guide rod moves along the guide rod, and the third bracket drives the steel wire rope to move through the first pulley and the second pulley, thereby realizing the orderly arrangement of the steel wire rope on the drum, avoiding the phenomenon of disordered ropes on the drum, and improving the service life of the steel wire rope and the working efficiency of the winch device. At the same time, a tension sensor is also arranged on the rope arranging mechanism. The tension sensor detects the tension of the steel wire rope and is signal-connected to the control unit, and can monitor the stress condition of the steel wire rope in real time. Since there is an error between the movement of the third bracket in the rope arranging mechanism and the rotation of the drum, when there is an obvious deviation between the movement of the steel wire rope by the rope arranging mechanism and the Ribas rope groove on the drum, the detected value of one of the tension sensors will be greater than the set value. Since the two tension sensors are distributed at intervals along the axial direction of the drum, if the detected value of which tension sensor is greater than the set value, it indicates that the deviation between the direction of the third bracket towards this tension sensor and the Ribas groove has occurred. The control unit will control the rotation speed of the second driving device so that the third bracket makes some compensation in the direction pointed by the tension sensor with a detected value greater than the set value until the detected values of both tension sensors are less than the set value.

[0024] Further, the control unit includes a PLC programmable controller, a CPU, a touch screen, a data storage device, etc., and the CPU and the touch screen are arranged in the electrical control room of the hull, and the PLC programmable controller, the touch screen, and the multi-functional operating rod are arranged in the driller's cabin. This setting method enables the operator to conveniently operate and control the winch device through the touch screen and the multi-functional operating rod in the driller's cabin. At the same time, the CPU in the electrical control room can process and store data, ensuring the stability and reliability of the system. In addition, the setting of the multi-functional operating rod further enriches the operation method and improves the convenience and flexibility of the operation. Description of the Drawings

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required in the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0026] Figure 1 It is a schematic structural diagram of the wave compensation drilling winch device of the present invention;

[0027] Figure 2 It is a partial structural schematic of the wave compensation drilling winch device of the present invention Figure 1 ;

[0028] Figure 3 It is a partial structural schematic of the wave compensation drilling winch device of the present invention Figure 2 ;

[0029] Figure 4 It is a schematic structural diagram of the rope arranging mechanism in the present invention;

[0030] In the figure: 1. Winch body; 101. First driving device; 102. Drum; 103. Brake disc; 104. Safety clamp; 105. Steel wire rope; 106. First bracket; 107. Base; 2. Rope arranging mechanism; 201. Second driving device; 202. Screw rod; 203. Guide rod; 204. Tension sensor; 205. Third bracket; 206. Second bracket; 207. First pulley; 208. Second pulley; 3. Hydraulic station; 4. Control unit. Specific embodiments

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0032] The purpose of the present invention is to provide a wave compensation drilling winch device to solve the problems existing in the above-mentioned prior art and improve the wave compensation effect of the winch device.

[0033] To make the above objects, features, and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] As Figures 1 to 4 shown, this embodiment provides a wave compensation drilling winch device, including:

[0035] The winch body 1, the winch body 1 includes a first bracket 106 fixedly arranged on the hull, a drum 102 rotatably installed on the first bracket 106, a steel wire rope 105 partially wound around the drum 102, a first driving device 101 for driving the drum 102 to rotate, and a safety protection device installed on the first bracket 106. The safety protection device is used to brake the rotation of the drum 102. The free end of the steel wire rope 105 is wound around a fixed pulley on the drilling derrick crown block and a movable pulley on the traveling block and then connected to a dead line clamp fixedly arranged on the derrick. The drill string is connected to the traveling block;

[0036] The monitoring unit, the monitoring unit includes a weight indicator. The weight indicator includes a pressure sensor arranged on the dead line clamp. The pressure sensor is used to detect the tension of the steel wire rope 105;

[0037] The control unit 4 is used to calculate the actual weight on bit value of the drill string according to the detection value of the weight indicator. The control unit 4 can compare the size of the actual weight on bit value with the set weight on bit value, and adjust the rotation direction and / or speed of the drum 102 by controlling the first driving device 101 to make the actual weight on bit value equal to the set weight on bit value.

[0038] The wave compensation drilling winch device of this embodiment obtains the tension of the steel wire rope 105 through the weight indicator. In the control unit, by subtracting the tension of the steel wire rope from the total gravity of the drill string, the actual weight on bit value can be obtained. The control unit calculates the above actual weight on bit value in real time, compares the size of the actual weight on bit value with the set weight on bit value, and according to the comparison result, adjusts the rotation direction and / or speed of the drum 102 by controlling the first driving device 101 to make the actual weight on bit value equal to the set weight on bit value; specifically: when the actual weight on bit value is less than the set weight on bit value, the control unit 4 increases the speed of the drum 102 by controlling the first driving device 101 until the actual weight on bit value is equal to the set weight on bit value; when the actual weight on bit is greater than the set weight on bit, the control unit 4 reduces the speed of the drum 102 or makes the drum 102 reverse by controlling the first driving device 101 until the actual weight on bit value is equal to the set weight on bit value. This real-time control and adjustment method can more effectively compensate for the changes in the depth of the drill string and the tension of the steel wire rope 105 caused by waves compared with the problems of low passive wave compensation accuracy, hysteresis and non-linearity in active wave compensation in the prior art. Thus, the wave compensation effect of the winch device is improved, the damage to the drilling equipment caused by waves is reduced, and the smooth progress of the drilling work is ensured.

[0039] In this embodiment, a base 107 is further arranged at the bottom end of the first bracket 106. The base 107 is fixedly connected to the hull.

[0040] In an alternative embodiment of the present embodiment, preferably, the safety protection device includes a brake disc 103 coaxially and fixedly connected to the drum 102, a safety clamp 104 for clamping the brake disc 103, and a hydraulic station 3. The safety clamp 104 is normally closed. The normally closed safety clamp can quickly react and clamp the brake disc 103 in an abnormal state, and the hydraulic station 3 is used to provide high-pressure oil to the safety clamp 104 to release the brake disc 103; the control unit 4 can control the operation of the hydraulic station 3; during normal operation, the hydraulic station 3 provides high-pressure oil to the safety clamp 104 to release the brake disc 103, and the drum 102 can rotate normally; when an abnormal situation occurs, such as when the winch suddenly loses power or the drill rig does not work, the safety clamp 104 will quickly clamp the brake disc 103 under the action of the internal disc spring, braking the rotation of the drum 102, thereby realizing the safety protection of the winch device, avoiding safety accidents caused by equipment failures or abnormal situations, and ensuring the safety of drilling operations.

[0041] In this embodiment, the number of the safety clamps 104 and the brake discs 103 is two, and the safety clamps 104 correspond to the brake discs 103 one by one.

[0042] In an alternative embodiment of the present embodiment, preferably, the winch body 1 further includes a rope arranging mechanism 2. The rope arranging mechanism 2 includes a second bracket 206 fixedly connected to the first bracket 106, a screw rod 202 rotatably installed on the second bracket 206, a second driving device 201 for driving the screw rod 202 to rotate, a guide rod 203 fixedly arranged on the second bracket 206, and a third bracket 205 threadedly connected to the screw rod 202. The third bracket 205 is slidably sleeved on the guide rod 203, and the steel wire rope 105 is slidably matched with the third bracket 205; the control unit 4 can control the operation of the second driving device 201; a first pulley 207 and a second pulley 208 are arranged on the third bracket 205. The axial direction of the guide rod 203, the axial direction of the screw rod 202, the axial direction of the first pulley 207, and the axial direction of the second pulley 208 are respectively parallel to the axial direction of the drum 102, and the steel wire rope 105 is wound around the first pulley 207 and the second pulley 208.

[0043] In an alternative embodiment of the present embodiment, preferably, the monitoring unit further includes two tension sensors 204 arranged on the third bracket 205 at intervals along the axial direction of the drum 102. Both of the two tension sensors 204 are signal-connected to the control unit 4. The interval between the two tension sensors 204 is equal to the diameter of the steel wire rope 105. The first pulley 207 and the second pulley 208 are closer to the drum 102 than any one of the tension sensors. After the steel wire rope 105 is wound around the first pulley 207 and the second pulley 208, it passes through the interval between the two tension sensors 204.

[0044] The specific working principle of the rope arranging mechanism 2 is as follows:

[0045] The second driving device 201 drives the screw rod 202 to rotate, causing the third bracket 205, which is threadedly connected to the screw rod 202 and slidably sleeved on the guide rod 203, to move along the guide rod 203. The third bracket 205 drives the steel wire rope 105 to reciprocate axially along the winding drum 102 through the first pulley 207 and the second pulley 208, so as to realize the orderly arrangement of the steel wire rope 105 on the winding drum 102 when the steel wire rope 105 is retracted and extended, avoiding the phenomenon of the steel wire rope 105 getting tangled on the winding drum 102, and improving the service life of the steel wire rope 105 and the working efficiency of the winch device;

[0046] However, there is an error between the movement of the third bracket 205 in the wire arranging mechanism 2 and the rotation of the winding drum 102. When there is an obvious deviation between the movement of the wire arranging mechanism 2 on the steel wire rope 105 and the Ribas rope groove on the winding drum 102, the detected value of one of the tension sensors 204 will be greater than the set value (this set value is pre-written in the control unit 4). Since the two tension sensors 204 are distributed at intervals along the axial direction of the winding drum 102, if the detected value of which tension sensor 204 is greater than the set value, it indicates that the third bracket 205 has a deviation from the Ribas groove in the direction of this tension sensor 204. Assuming that the axial direction of the winding drum 102 is the left-right direction, the two tension sensors 204 are distributed one on the left and one on the right. If the detected value of the left tension sensor 204 is greater than the set value, it means that the third bracket 205 has shifted to the right relative to the winding drum 102. At this time, the control unit 4 controls the second driving device 201 to make the moving speed of the third bracket 205 slower to compensate to the left until the detected values of both tension sensors 204 are less than the set value; if the detected value of the right tension sensor 204 is greater than the set value, it means that the third bracket 205 has shifted to the left relative to the winding drum 102. At this time, the control unit 4 controls the second driving device 201 to make the moving speed of the third bracket 205 slower to compensate to the right until the detected values of both tension sensors 204 are less than the set value. That is, the control unit 4 will control the rotation speed of the second driving device 201 to make the third bracket 205 make some compensation in the direction pointed by the tension sensor 204 whose detected value is greater than the set value until the detected values of both tension sensors 204 are less than the set value.

[0047] The wire arranging mechanism 2 in this embodiment can not only arrange the steel wire rope 105 in an orderly manner, but also automatically eliminate the deviation generated in the wire arranging process by controlling the second driving device 201 through the feedback of the two tension sensors 204, ensuring the stable progress of the wire arranging work.

[0048] In an alternative solution of this embodiment, preferably, the control unit 4 includes a PLC programmable controller, a CPU, a touch screen, a data storage device, a weight indicator, a tension sensor 204. The weight indicator, the touch screen and the data storage device are respectively connected to the CPU by signals, and the first driving device 101, the safety protection device and the second driving device 201 are respectively connected to the PLC programmable controller by signals.

[0049] In an alternative solution of this embodiment, preferably, the control unit 4 further includes a multi-functional joystick connected to the CPU by signals. The setting of the multi-functional joystick further enriches the operation mode and improves the convenience and flexibility of operation.

[0050] In an alternative solution of this embodiment, preferably, the CPU and the touch screen are arranged in the electrical control room of the hull, and the PLC programmable controller, the touch screen and the multi-functional joystick are respectively arranged in the driller's cabin of the hull; so that the operator can conveniently operate and control the winch device through the touch screen and the multi-functional joystick in the driller's cabin, and at the same time, the CPU in the electrical control room can process and store data, ensuring the stability and reliability of the system.

[0051] In an alternative solution of this embodiment, preferably, the surface of the drum 102 is provided with an anti-corrosion coating, and the material of the anti-corrosion coating is epoxy zinc-rich paint, which can effectively prevent the drum 102 from being damaged due to seawater corrosion and other reasons, and extends the service life of the drum 102; a Ribas rope groove is provided on the drum 102, which can make the winding of the steel wire rope 105 on the drum 102 more compact and orderly, reduce the wear between the steel wire ropes 105, and further improve the working performance and reliability of the winch device.

[0052] In an alternative solution of this embodiment, preferably, both the first driving device 101 and the second driving device 201 adopt permanent magnet synchronous motors; the permanent magnet synchronous motor has the advantages of high efficiency, energy saving, high power factor, good speed regulation performance, etc. Compared with the traditional driving device, it can improve the working efficiency of the winch device, reduce energy consumption and operating costs; neither the first driving device 101 nor the second driving device 201 is provided with a speed reducer, with a simple structure, no need for a speed change structure, and realizing gearless transmission.

[0053] In an alternative solution of this embodiment, the monitoring unit further includes a speed sensor for detecting the rotational speed of the output shaft of the first driving device. The speed sensor is connected to the CPU in the control unit and can directly feedback the rotational speed of the output shaft of the first driving device to the control unit.

[0054] In the present invention, specific examples are used to illustrate the principles and implementation manners of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation on the present invention.

Claims

1. A wave compensation drilling winch device, characterized in that Comprising: A winch body, the winch body includes a first bracket fixedly arranged on the hull, a drum rotatably installed on the first bracket, a wire rope partially wound around the drum, a first driving device for driving the drum to rotate, and a safety protection device installed on the first bracket. The safety protection device is used to brake the rotation of the drum. The free end of the wire rope is wound around a fixed pulley on the drilling derrick crown block and a movable pulley on the traveling block, and then connected to a dead line anchor fixedly arranged on the derrick. The drill string is connected to the traveling block; A monitoring unit, the monitoring unit includes a weight indicator, and the weight indicator includes a pressure sensor arranged on the dead line anchor. The pressure sensor is used to detect the tension of the wire rope; A control unit, the control unit is used to calculate the actual drilling pressure value of the drill tool according to the detection value of the weight indicator. The control unit can compare the size of the actual drilling pressure value with the set drilling pressure value, and according to the comparison result, adjust the rotation direction and / or speed of the drum by controlling the first driving device to make the actual drilling pressure value equal to the set drilling pressure value.

2. The wave compensation drilling drawworks device according to claim 1, wherein: The safety protection device includes a brake disc coaxially and fixedly connected with the drum, a safety clamp for clamping the brake disc, and a hydraulic station. The safety clamp is normally closed, and the hydraulic station is used to provide high-pressure oil to the safety clamp to make the safety clamp release the brake disc; the control unit can control the operation of the hydraulic station.

3. The wave compensation drilling drawworks device according to claim 1, characterized in that: The winch body further includes a wire rope arranging mechanism, the wire rope arranging mechanism includes a second bracket fixedly connected with the first bracket, a screw rod rotatably installed on the second bracket, a second driving device for driving the screw rod to rotate, a guide rod fixedly arranged on the second bracket, and a third bracket threadedly connected with the screw rod. The third bracket is slidably sleeved on the guide rod, and the wire rope is slidably matched with the third bracket; the control unit can control the operation of the second driving device; a first pulley and a second pulley are arranged on the third bracket. The axial direction of the guide rod, the axial direction of the screw rod, the axial direction of the first pulley, and the axial direction of the second pulley are respectively parallel to the axial direction of the drum, and the wire rope is wound around the first pulley and the second pulley.

4. The wave compensation drilling winch device according to claim 3, wherein: The monitoring unit further includes two tension sensors arranged on the third bracket at intervals along the axial direction of the drum. The tension sensors are signal-connected to the control unit. The interval between the two tension sensors is equal to the diameter of the wire rope. The first pulley and the second pulley are closer to the drum than any one of the tension sensors. After the wire rope is wound around the first pulley and the second pulley, it passes through the interval between the two tension sensors.

5. The wave compensation drilling drawworks device according to claim 4, characterized in that: The control unit includes a PLC programmable controller, a CPU, a touch screen, and a data storage device. The weight indicator, the tension sensor, the PLC programmable controller, the touch screen, and the data storage device are respectively signal-connected to the CPU. The first driving device, the safety protection device, and the second driving device are respectively signal-connected to the PLC programmable controller.

6. The wave compensation drilling drawworks device according to claim 5, characterized in that: The control unit further includes a multi-functional joystick that is signal-connected to the CPU.

7. The wave compensation drilling drawworks device according to claim 6, characterized in that: The CPU and the touch screen are arranged in the electric control room of the hull, and the PLC programmable controller, the touch screen and the multi-functional joystick are respectively arranged in the driller's cabin of the hull.

8. The wave compensation drilling drawworks device according to claim 1, characterized in that: An anti-corrosion coating is provided on the surface of the drum, and the material of the anti-corrosion coating is epoxy zinc-rich paint; a Ribas rope groove is provided on the drum.

9. The wave compensation drilling drawworks device according to claim 3, characterized in that: Both the first driving device and the second driving device adopt permanent magnet synchronous motors.

10. The wave compensation drilling winch device according to claim 1, characterized in that: The monitoring unit further includes a speed sensor for detecting the speed of the output shaft of the first driving device.

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