CN101798909A - Drilling column heave compensation device of marine floating type drilling platform - Google Patents

Abstract

The invention discloses a drill string heave compensation device for an ocean floating drilling platform. A composite hydraulic cylinder is used as a heave compensation hydraulic cylinder in the crane heave compensation device, and the high-pressure hydraulic oil output by the hydraulic pump passes through a compensation control valve. It leads to the rodless chamber of the inner cylinder of the composite compensation hydraulic cylinder and the rod chamber of the outer cylinder, so that a controllable additional force is provided to the piston rod of the outer cylinder, which is equal to the hydraulic pressure acting on the rodless chamber of the outer cylinder of the compensation hydraulic cylinder Combined forces provide support to the crane. The direction and magnitude of the additional force are controlled according to the heave motion of the platform to improve the compensation effect of the heave compensation system. The control unit sends a control command to the hydraulic system according to the detected movement speed of the platform in the vertical direction, drives the piston of the compensation hydraulic cylinder to push the crane movement, and compensates the heave movement of the platform, so that the crane, traveling block and hook are within the allowable The range is at rest in the vertical direction relative to the bottom of the well.

Description

Offshore floating drilling platform drill string heave compensation device

technical field

The invention relates to a hydraulic control system characterized by electro-hydraulic control technology, in particular to a heave compensation device for a drill string of an ocean drilling platform.

Background technique

With the depletion of land resources, the strategic vision of the world's economic development is focused on the ocean, and the development of marine technology and high-tech equipment is particularly important. In the field of petroleum, with the development of China's economy, especially the rapid development of the petrochemical and automobile industries as the pillar industries, the contradiction of insufficient supply of oil and natural gas has become increasingly prominent. In view of the depletion of onshore oil resources, marching into the deep sea has become an inevitable trend. At present, the maximum working water depth of offshore oil drilling rigs has exceeded 3000m, and will continue to develop in a deeper direction. Working in such water depth conditions requires more stringent requirements on all aspects of the drilling rig, and must also adapt to some special conditions faced in deep water conditions, and many equipment needs to be redesigned and developed.

Drill string heave compensation device is one of the essential equipment to ensure the safe operation of offshore drilling ships or semi-submersible drilling platforms and improve work efficiency and quality. The semi-submersible drilling platform and drilling pontoon used in deep-sea drilling will produce periodic heave motion under the action of waves, and make the drill string reciprocate up and down, causing changes in the drilling pressure at the bottom of the well, and even make the drill bit out of the bottom of the well. It affects the drilling efficiency, reduces the life of the drill bit and drill pipe, creates potential safety hazards in operation, and even leads to failure to drill and forced shutdown, resulting in huge economic losses. Therefore, in order to reduce downtime and reduce drilling costs, the floating drilling platform must take appropriate compensation measures for the heave movement of the drill string.

The hydraulic heave compensation system is most commonly used on offshore floating drilling platforms and has many forms. According to its power supply method, it can be divided into three forms: active, passive and semi-active.

The active heave compensation system has good compensation effect and strong adaptability, but due to the large mass of the drill string and frequent up and down reciprocating movements, a large amount of energy will be consumed in the compensation process.

The passive heave compensation system basically does not need the system to provide additional energy during the compensation process, and the system is simple, so it has been widely used, but the compensation effect is not very ideal, and there is a certain hysteresis phenomenon.

The semi-active heave compensation system can combine the advantages of both, but the system structure is more complicated and the manufacturing cost is higher.

Contents of the invention

The object of the present invention is to provide a heave compensation device for a floating offshore oil drilling platform to meet the performance requirements of offshore oil drilling.

In order to achieve the above purpose, the general idea of the present invention is to use a compound hydraulic cylinder as a heave compensation hydraulic cylinder in the heave compensation device of the crane. Lead the high-pressure hydraulic oil in the gas-hydraulic accumulator to the rodless chamber of the outer cylinder of the composite compensation hydraulic cylinder, so as to provide a hydraulic pressure to withstand the static load of the crane; the high-pressure hydraulic oil output by the hydraulic pump is passed through the compensation control valve Provide a controllable additional force to the rodless chamber of the inner cylinder of the composite compensation hydraulic cylinder and the rod chamber of the outer cylinder, thereby providing a controllable additional force to the piston rod of the outer cylinder. The resultant force of this force and the hydraulic force acting on the rodless chamber of the outer cylinder of the compensation hydraulic cylinder The crane provides support.

The technical scheme adopted in the present invention is to improve on the basis of the conventional passive heave compensation device composed of a crown block, two heave compensation hydraulic cylinders, a rocker arm, a gas-liquid accumulator, and a traveling block, adding an acceleration sensor, Fuel tank, electric motor, hydraulic pump, hydraulic pump outlet check valve, compensation control valve, inner cylinder rodless cavity pressure sensor, outer cylinder rod cavity pressure sensor, bypass valve, speed limiting valve, fuel charge check valve, safety control valve, power failure protection valve and system control unit. The cylinder body of the compensation hydraulic cylinder is hinged to the derrick, the upper end of the piston rod is hinged to the crown block, and a pressure sensor is installed on the rod chamber of the outer cylinder of the compensation hydraulic cylinder and the rodless chamber of the inner cylinder. The ratio of the piston area of the inner cylinder of the compensation hydraulic cylinder to the working area of the rod chamber of the outer cylinder is 1:1. The inlet of the hydraulic pump is connected to the oil tank, and the outlet is connected to the P port of the compensation control valve through the check valve; the T port of the compensation control valve is connected to the oil tank; The rodless chamber of the cylinder or the rod chamber of the outer cylinder are connected; one end of the bypass valve is connected with the rodless chamber of the inner cylinder of the two composite compensation hydraulic cylinders, and the other end is connected with the rod chamber of the outer cylinder of the two composite compensation hydraulic cylinders; speed limit The A port of the valve is connected with the rod chamber of the outer cylinder of the two compound compensation hydraulic cylinders, and the B port is connected with the A port of the compensation control valve; the A port of the hydraulic shut-off valve is connected with the rodless chamber of the outer cylinder of the two compound compensation hydraulic cylinders The P port is connected to the A port of the power failure protection valve; the P port of the power failure protection valve is connected to the air-liquid converter, the outlet of the oil supplement check valve and the inlet of the safety control valve; the other end of the gas-liquid converter It is connected to the working gas cylinder through the gate valve; the working gas cylinder is connected to the discharge gate valve, and connected to the high-pressure gas cylinder through the gate valve; the high-pressure gas cylinder is connected to the air pressure source through the gate valve; together and connected to the oil tank; the control unit is electrically connected to the control signal interface of the compensation control valve, bypass valve, power failure protection valve and frequency conversion motor, and obtains the rod chamber pressure sensor of the outer cylinder and the pressure sensor of the rodless chamber of the inner cylinder And the electric signal of the acceleration sensor fixedly connected on the platform. The hydraulic pump is mechanically connected with the frequency conversion motor. The control unit is an industrial computer or single-chip microcomputer with analog-to-digital A/D and digital-to-analog D/A signal conversion functions.

Compared with the background technology, the present invention has the beneficial effects that:

1. The compensation hydraulic cylinder in the system adopts a composite structure. The high-pressure hydraulic oil in the gas-liquid converter bears the static load on the crane through the rodless cavity of the outer cylinder. The hydraulic pump is connected to the rodless cavity of the inner cylinder or the outer cylinder through the compensation control valve. The rod cavity is connected to overcome the dynamic load caused by the friction force and the pressure change of the working gas cylinder during the motion compensation process, thereby effectively limiting the extra energy consumption and improving the compensation effect.

2. When the system suddenly loses load, the piston rod of the composite compensation hydraulic cylinder will move upward quickly, and the flow out of the rod cavity of the outer cylinder will increase, but the speed limiting valve will limit the flow rate below a certain value, thus limiting the upward speed of the piston ; At the same time, the pressure in the rod chamber of the outer cylinder increases, pushing the hydraulic shut-off valve to change direction, cutting off the pressure channel between the gas-liquid converter and the composite compensation hydraulic cylinder; the pressure signal measured by the pressure sensor in the rod chamber of the outer cylinder exceeds Within the allowable range, the control unit immediately sends a control command to cut off the power supply of the power failure protection valve, making it in the closed state. Through the above three protection measures, avoid serious accidents caused by load loss.

3. A power failure protection valve is installed between the gas-liquid converter and the compensation hydraulic cylinder. When the system loses power supply for some reason, the power failure protection valve resets under the action of the spring, cutting off the accumulator and the compensation hydraulic cylinder between the oil circuit, to avoid accidents.

4. The control unit can send instructions to the frequency conversion motor and compensation control valve according to the acceleration signal sent by the acceleration sensor installed on the drilling platform and the pressure signal of the compound compensation hydraulic cylinder, and control the flow to the rodless cavity of the compound compensation hydraulic cylinder. The flow of hydraulic oil reduces the impact of platform heave movement on the hook, thereby keeping the bottom hole pressure constant within a certain range.

Description of drawings

Fig. 1 is a structural schematic diagram of a drill string heave compensation device for a crown block of an offshore floating drilling platform proposed according to the present invention.

Fig. 2 is a schematic diagram of the hydraulic system of the drill string heave compensation device for the offshore floating drilling platform proposed by the present invention.

In the figure: 1-travel block, 2-compound heave compensation hydraulic cylinder, 3-derrick, 4-rocker arm, 5-crane block, 6-pulley, 7-crane block guide rail, 8-acceleration sensor, 9-oil tank , 10-hydraulic pump, 11-frequency conversion motor, 12-hydraulic pump outlet check valve, 13-compensation control valve, 14-outer cylinder rod chamber pressure sensor, 15-inner cylinder rodless chamber pressure sensor, 16-bypass Valve, 17-speed limiting valve, 18-hydraulic shut-off valve, 19-power failure protection valve, 20-gas-liquid converter, 21-gate valve, 22-working gas cylinder, 23-gate valve, 24-air pressure source, 25- Gate valve, 26-air release gate valve, 27-gate valve, 28-high-pressure gas cylinder, 29-oil supply check valve, 30-safety control valve, 31-control unit.

Detailed ways

The present invention will be further described below in conjunction with drawings and embodiments.

As shown in the figure, the cylinder body of the compensation hydraulic cylinder 2 is hinged to the derrick 3, and the upper end of the piston rod is hinged to the crown block 5. A pressure sensor 14 is installed in the rod chamber of the outer cylinder of the compensation hydraulic cylinder 2, and a pressure sensor 14 is installed on the rodless chamber of the inner cylinder. Install the pressure sensor 15. The ratio of the piston area of the inner cylinder of the compensation hydraulic cylinder to the working area of the rod chamber of the outer cylinder is 1:1. The acceleration sensor 8 is fixedly connected to the platform; the inlet of the hydraulic pump 10 is connected to the fuel tank 9, and the outlet is connected to the P port of the compensation control valve 13 through the check valve 12; the T port of the compensation control valve 13 is connected to the fuel tank 9; the compensation control valve 13 A port and B port of the two composite compensation hydraulic cylinders 2 are connected to the rodless cavity of the inner cylinder or the rod cavity of the outer cylinder; one end of the bypass valve 16 is connected to the rodless cavity of the inner cylinder of the two composite compensation hydraulic cylinders 2, The other end is connected with the rod cavity of the outer cylinder of the two compound compensation hydraulic cylinders 2; the A port of the speed limiting valve 17 is connected with the rod cavity of the outer cylinder of the two compound compensation hydraulic cylinders 2, and the other end is connected with the A port of the compensation control valve 13 The A port of the hydraulic shut-off valve 18 is connected with the rodless chamber of the outer cylinder of the two composite compensation hydraulic cylinders 2, and the P port is connected with the A port of the power failure protection valve 19; the P port of the power failure protection valve 19 is connected with the The gas-liquid converter 20, the outlet of the oil replenishment check valve 29 are connected to the inlet of the safety control valve 30; the other end of the gas-liquid converter 20 is connected to the working gas cylinder 22 through gate valves 21, 23; The gate valve 26 is connected, and the high-pressure gas cylinder 28 is connected through the gate valve 27; the high-pressure gas cylinder 28 is connected with the air pressure source 24 through the gate valve 25; ; The control unit 31 is electrically connected to the control signal interface of the compensation control valve 13, the bypass valve 16, the power failure protection valve 19, and the frequency conversion motor 11, and is connected with the rod chamber pressure sensor 14 of the outer cylinder and the rodless chamber pressure sensor of the inner cylinder. 15 and the electric signal connection of the acceleration sensor 8 that is connected on the platform. The hydraulic pump 10 is mechanically connected with a variable frequency motor 11 . The control unit 31 is an industrial computer or a single-chip microcomputer with analog-to-digital A/D and digital-to-analog D/A signal conversion functions. The high-pressure hydraulic oil in the gas-liquid converter 20 leads to the rodless chamber of the outer cylinder of the composite compensation hydraulic cylinder 2, providing a hydraulic pressure to withstand the static load of the crane; the hydraulic pump 10 communicates with the rodless chamber of the inner cylinder through the compensation control valve 13 Or the outer cylinder is communicated with the rod cavity to overcome the dynamic load caused by the friction force and the pressure change in the working gas cylinder 22 during the compensation process. Both ends of the bypass valve 16 are connected with the rodless chamber of the inner cylinder and the rod chamber of the outer cylinder of the compensation hydraulic cylinder 2. When the bypass valve 16 is turned on, the system can realize the function of passive compensation. The outer cylinder of the compensation hydraulic cylinder 2 has a rod chamber connected to a speed-limiting valve 17 to prevent the piston rod of the compensation hydraulic cylinder 2 from overspeeding and overshooting due to the disconnection of the drill pipe. The control port of the hydraulic shut-off valve 18 is connected with the rod cavity of the outer cylinder of the composite compensation hydraulic cylinder 2. When the piston rod moves upward at overspeed, the increased pressure pushes the hydraulic shut-off valve 18 to change direction, cutting off the gas-liquid converter 20 and Composite compensation for the connecting pipeline of the hydraulic cylinder 2 can avoid serious accidents. The power failure protection valve 19 is installed between the gas-liquid converter 20 and the compensation hydraulic cylinder 2, and automatically cuts off the oil circuit when power failure occurs, and stops supplying oil to the compensation hydraulic cylinder.

The working principle of the present invention is as follows:

During normal operation, the power-off protection valve is in the lower conduction state when it is energized, and the hydraulic shut-off valve is in the lower conduction state under the action of the spring. The rod cavities are connected to support the static load on the crown block. If the bypass valve 16 is in the conduction state of the right position, the rodless chamber of the inner cylinder of the composite compensation hydraulic cylinder 2 communicates with the rod chamber of the outer cylinder, and the compensation function does not work. At this time, the system is a conventional passive heave compensation system. If the bypass valve 16 is in the disconnected state in the left position, the rodless chamber of the inner cylinder of the composite compensation hydraulic cylinder 2 is not connected to the rod chamber of the outer cylinder, which acts as a compensation. At this time, the system is a semi-active heave compensation system.

When the floating offshore drilling platform sinks with the waves, the derrick will descend with the composite compensation hydraulic cylinder 2, the elongation and elastic deformation of the drill string will be reduced, the load on the crown block 5 will be reduced, and the composite compensation hydraulic cylinder 2 will The piston rod is extended, the hydraulic oil of the gas-liquid converter 20 flows into the compensation hydraulic cylinder 2, and the pressure of the working gas cylinder 22 is reduced, which is balanced with the reduced crane load. The acceleration sensor 8 installed on the compensation hydraulic cylinder detects the motion acceleration of the platform, and transmits the signal to the control unit 31 . At the same time, the pressure signals of the two chambers detected by the pressure sensor 14 of the rod chamber of the outer cylinder and the pressure sensor 15 of the rodless chamber of the inner cylinder are also transmitted to the control unit 31 . The control unit 31 sends a control command to the compensation control valve 13 to move left according to the above-mentioned detected signals and according to the established control strategy, so that the P port communicates with the B port, the A port communicates with the T port, and the hydraulic pump 10 is connected to the composite valve. Oil is supplied to the rodless chamber of the compensation hydraulic cylinder 2, so that the pressure of the rodless chamber in the inner cylinder rises, offsetting the drop in bearing capacity caused by the pressure reduction of the working cylinder and the friction force of the piston rod protruding, and the rod chamber of the outer cylinder passes through The channel from port A to port T is connected with the oil tank to realize oil return, so that the crane 5 moves upward relative to the platform to maintain the absolute position unchanged, and at the same time the load rises to the original set value. During this process, the displacement of the spool to the left can be adjusted to change the flow area of the valve port, thereby controlling the flow to control the movement speed of the piston and improving the compensation effect of the system.

Conversely, when the floating offshore drilling platform rises with the waves, the derrick will rise with the compound compensation hydraulic cylinder 2, the elongation and elastic deformation of the drill string will increase, the load on the crown block 5 will increase, and the compound compensation hydraulic cylinder 2 will The piston rod retracts, the hydraulic oil in the hydraulic cylinder flows back to the gas-liquid converter 20, and the pressure of the working gas cylinder 22 increases to balance with the increased crane load. The acceleration sensor 8 installed on the compensation hydraulic cylinder detects the motion acceleration of the platform, and transmits the signal to the control unit 31 . At the same time, the pressure signals of the two chambers detected by the pressure sensor 14 of the rod chamber of the outer cylinder and the pressure sensor 15 of the rodless chamber of the inner cylinder are also transmitted to the control unit 31 . The control unit 31 sends a control command to the compensation control valve 13 to move right according to the above-mentioned detected signals and according to the established control strategy, so that the P port communicates with the A port, the B port communicates with the T port, and the hydraulic pump 10 is connected to the composite valve. Compensation hydraulic cylinder 2. The outer cylinder has a rod cavity to supply oil, so that the pressure of the outer cylinder has a rod cavity to increase, which offsets the increase in the carrying capacity and the friction force of the piston rod retraction caused by the pressure increase of the working cylinder, and the inner cylinder has no rod. The chamber communicates with the oil tank through the channel from port B to port T to realize the oil return, so that the crane 5 moves down relative to the platform to maintain the absolute position, and at the same time the load drops to the original set value. During this process, the displacement of the spool to the right can be adjusted to change the flow area of the valve port, thereby controlling the flow to control the movement speed of the piston and improving the compensation effect of the system.

When the load of the system changes, the pressure of the working gas cylinder 22 can be adjusted to maintain the force balance of the piston rod of the compound compensating hydraulic cylinder 2 . When the system load decreases, the working gas cylinder 22 communicates with the vent gate valve 26, and the pressure of the working gas cylinder decreases through deflation; when the system load increases, the working gas cylinder 22 communicates with the high-pressure gas cylinder 28, and the high-pressure gas Inflation of the cylinder increases the pressure of the working cylinder.

When the system suddenly loses load due to accidents such as drill pipe breakage, the piston rod of the composite compensation hydraulic cylinder 2 will move upward rapidly, and the flow out of the rodless cavity of the outer cylinder will increase, but the speed limiting valve 17 will limit the flow rate below a certain value. One value, thereby limiting the upward speed of the piston; at the same time, the pressure in the rod chamber of the outer cylinder increases, pushing the hydraulic shut-off valve 18 to change direction, and cutting off the pressure channel between the gas-liquid converter 20 and the composite compensation hydraulic cylinder 2; When the pressure signal measured by the cylinder rod cavity pressure sensor 14 exceeds the allowable range, the control unit 31 immediately sends a control command to cut off the power supply of the power failure protection valve 19, making it in a closed state. Through the above three protection measures, avoid serious accidents caused by load loss.

When the system loses power supply for some reason, the power failure protection valve 20 resets under the action of the spring, cutting off the oil circuit between the gas-liquid converter 20 and the composite compensation hydraulic cylinder 2, preventing accidents from happening.

According to the acceleration signal from the acceleration sensor 8 installed on the drilling platform and the pressure signal of the compound compensation hydraulic cylinder 2, the control unit 31 sends instructions to the frequency conversion motor 11 and the compensation control valve 13 to control the flow to the inner cylinder of the compound compensation hydraulic cylinder 2. Rod chamber or outer cylinder has rod chamber hydraulic oil flow.

The invention overcomes the disadvantages of slow compensation response speed of traditional passive heave compensation system and poor compensation effect due to pressure fluctuation and friction of the accumulator. Since the hydraulic pump only supplies oil to the rodless chamber of the inner cylinder with a small bore, its power is only used to overcome the frictional resistance and system inertia, so the energy consumption is effectively controlled, the operating cost of the system is reduced, and the compensation accuracy is improved. The utility model has the advantages of simple structure, low energy consumption and good effect. In addition, the hydraulic compensation cylinder body of the present invention is installed on the derrick without relative movement with the drilling device, and rigid pipelines can be used. Reduces potential for hydraulic line damage compared to flexible tubing required for traveling block compensation.

Claims (5)

1. drilling column heave compensation device of marine floating type drilling platform; Comprise tourist bus (1); Combined type heave compensation hydraulic cylinder (2); Derrick (3); Rocking arm (4); Overhead traveling crane (5); Pulley (6) and overhead traveling crane guide rail (7); Dead line; Fast line; Acceleration transducer (8); Fuel tank (9); Hydraulic pump (10); Adjustable frequency motor (11); Hydraulic pump outlet check valve (12); Compensating control valve (13); Outer shell rod chamber pressure sensor (14); Inner casing rodless cavity pressure sensor (15); By-passing valve (16); Governor valve (17); Stop valve (18) surges; Loss protecting valve (19); Air-liquid converter (20); Gate valve (21) (23) (25) (26) (27); Work gas cylinder (22); Pneumatic supply (24); Gas cylinder (28); Repairing check valve (29); Safety control valve (30) and control module (31); The cylinder body of combined type heave compensation hydraulic cylinder (2) links to each other with derrick (3); The piston rod of hydraulic cylinder (2) links to each other with overhead traveling crane (5); Supporting overhead traveling crane moves along overhead traveling crane guide rail (7); Rocking arm (4) links to each other with overhead traveling crane (5) with derrick (3); Outer shell rod chamber setting pressure sensor (14) at combined type compensating hydraulic cylinder (2); Inner casing rodless cavity setting pressure sensor (15) at combined type compensating hydraulic cylinder (2) connects firmly acceleration transducer (8) at platform; It is characterized in that, the inlet of hydraulic pump (10) links to each other with fuel tank (9), the outlet of hydraulic pump (10) links to each other through the P mouth of one way valve (12) with compensating control valve (13), the T mouth of compensating control valve (13) links to each other with fuel tank (9), and the A mouth of compensating control valve (13) links to each other with the inner casing rodless cavity or the outer shell rod chamber of two combined type compensating hydraulic cylinders (2) with the B mouth; One end of bypass valve (16) links to each other with the inner casing rodless cavity of two combined type compensating hydraulic cylinders (2), and the other end links to each other with the outer shell rod chamber of two combined type compensating hydraulic cylinders (2); The A mouth of governor valve (17) links to each other with the outer shell rod chamber of two combined type compensating hydraulic cylinders (2), and the B mouth links to each other with the A mouth of compensating control valve (13); The A mouth of stop valve (18) of surging links to each other with the outer shell rodless cavity of two combined type compensating hydraulic cylinders (2), and the P mouth links to each other with the A mouth of loss protecting valve (19); The P mouth of loss protecting valve (19) links to each other with the outlet of air-liquid converter (20), repairing one way valve (29) and the inlet of Safety control valve (30) simultaneously; The other end of air-liquid converter (20) links to each other with work gas cylinder (22) by gate valve (21) (23); Work gas cylinder (22) links to each other with venting gate valve (26), links to each other with gas cylinder (28) by gate valve (27); Gas cylinder (28) links to each other with pneumatic supply (24) by gate valve (25); The outlet of the inlet of repairing one way valve (29) and Safety control valve (30) connects together and links to each other with fuel tank (9); Control module (31) is electrically connected with the control signal interface of compensating control valve (13), bypass valve (16), loss protecting valve (19), adjustable frequency motor (11) respectively, and is connected with outer shell rod chamber pressure sensor (14), inner casing rodless cavity pressure sensor (15) and the signal of telecommunication that is connected in the acceleration transducer (8) on the platform.

2. drilling column heave compensation device of marine floating type drilling platform according to claim 1, it is characterized in that, compensating hydraulic cylinder (2) adopts composite construction, air-liquid converter (20) bears static load on the overhead traveling crane (5) by the outer shell rodless cavity, hydraulic pump (10) communicates with inner casing rodless cavity or outer shell rod chamber through compensating control valve (13), overcomes the dynamic loading in the movement compensation process.

3. drilling column heave compensation device of marine floating type drilling platform according to claim 1, it is characterized in that, the compensating cylinder outer shell of combined type compensating hydraulic cylinder (2) is a piston rod, and inner casing is a plunger case, and the inner casing ram area is 1: 1 with the ratio of outer shell rod chamber work area.

4. drilling column heave compensation device of marine floating type drilling platform according to claim 1, it is characterized in that, dead line links to each other with overhead traveling crane (5) by the structure of being made up of rocking arm (4) and pulley (6) with fast line, keep overhead traveling crane (5) when moving up and down dead line point constant with the hoist room rope capacity, avoided working long hours and frequently commutating of boring winch.

5. drilling column heave compensation device of marine floating type drilling platform according to claim 1 is characterized in that, described signaling control unit (31) is an Industrial Personal Computer (IPC) that has modulus A/D and digital-to-analogue D/A function switching signal.

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