Marine drilling platform with motion compensation suitable for surge operation

Abstract

The utility model relates to the technical field of ocean engineering, in particular to an ocean drilling platform with motion compensation suitable for surge operation, which comprises a platform bottom plate, a platform base is fixedly mounted on the platform bottom plate, a mounting flat plate is mounted on the platform base in a sliding manner, a screw rod is rotatably mounted in the platform base, and the screw rod is in threaded connection with the mounting flat plate. A motor used for driving the screw rod is fixedly installed on one side of the platform base, electric supporting sets are fixedly installed at the two ends of the installation flat plate, and the tops of the two electric supporting sets are fixedly connected with the same platform top base used for containing a drilling machine. The inclination angle of the platform top base is changed by adjusting the electric supporting set and the motor to drive the installation flat plate, so that the influence on the platform bottom plate during surge impact is relieved, the platform top base is relatively stable, meanwhile, high-precision dynamic stable control over the platform body under the surge effect is achieved, and the service life of the platform body is prolonged. And smooth drilling operation is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of marine engineering, in particular to an ocean drilling platform with motion compensation suitable for surge operations. Background Art

[0002] In the exploration and development of marine resources, drilling operations are a key link in obtaining seabed geological information. Due to the particularity of the marine environment, offshore drilling operations require a relatively fixed platform to support the drilling equipment to ensure the accuracy and safety of the operation. However, traditional floating platforms often have poor wave resistance when facing harsh sea conditions such as swells, and the platforms are prone to large-scale shaking, seriously affecting the accuracy and safety of drilling operations. In order to reduce the impact of waves on the platform and improve operational stability, self-elevating platforms are often used in sea areas with harsh sea conditions. Self-elevating platforms use their unique pile leg structure to lift the platform body to a certain height above the water surface, thereby avoiding most of the impact of waves. However, the construction and operation costs of self-elevating platforms are high, and they are difficult to apply in some deep water areas.

[0003] Therefore, developing an offshore drilling floating platform that can operate stably in a surge environment is of great significance for saving operating costs, improving operating efficiency and ensuring operating safety. Utility Model Content

[0004] The purpose of the present utility model is to provide an ocean drilling platform with motion compensation suitable for surge operations, so as to solve the problems raised in the above-mentioned background technology.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A motion-compensated marine drilling platform suitable for surge operations comprises a platform bottom plate, a platform base is fixedly mounted on the platform bottom plate, a mounting plate is slidably mounted on the platform base, a screw is rotatably mounted in the platform base, and the screw is threadedly connected to the mounting plate, a motor for driving the screw is fixedly mounted on one side of the platform base, electric support groups are fixedly mounted on both ends of the mounting plate, and the tops of the two electric support groups are fixedly connected to the same platform top seat for placing a drilling rig.

[0007] As a preferred solution for a motion-compensated marine drilling platform suitable for surge operations, a horizontal acceleration sensor for real-time measurement of the horizontal motion state of the platform top seat is fixedly installed on the bottom of the platform top seat.

[0008] As a preferred solution for a motion-compensated marine drilling platform suitable for surge operations, an anchoring assembly for enhancing the stability of the platform bottom plate is fixedly installed on the platform bottom plate.

[0009] As a preferred solution for a motion-compensated marine drilling platform suitable for surge operations, there are multiple anchoring assemblies, and at least four of the anchoring assemblies are respectively arranged at the four corners of the platform base plate.

[0010] As a preferred solution for an offshore drilling platform with motion compensation suitable for surge operations, the anchoring assembly includes an anchor windlass base plate, on which a support column and a bracket are fixedly installed, a chain drum is rotatably connected inside the support column, an anchor chain is coiled on the chain drum, and an anchor is fixedly installed at one end of the anchor chain, and a fixed pulley for receiving the anchor chain is fixedly installed in the bracket.

[0011] As a preferred solution for an offshore drilling platform with motion compensation suitable for surge operations, a support for supporting the platform top seat is fixedly mounted on the mounting plate.

[0012] Due to the adoption of the above technical solution, the present invention has achieved the following technical advancements compared to the prior art:

[0013] When the platform base is impacted by waves, the electric support group and the motor-driven mounting plate are adjusted to change the inclination angle of the platform top seat, thereby alleviating the impact of the surge on the platform base plate, making the platform top seat relatively stable. At the same time, high-precision dynamic stability control of the platform body under the action of surge waves is achieved, ensuring the smooth progress of drilling operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are merely illustrative, and those skilled in the art can, without inventive effort, derive other implementation drawings based on the provided drawings.

[0015] Figure 1 It is a structural diagram of the utility model;

[0016] Figure 2 for Figure 1 Front view of

[0017] Figure 3 It is a structural schematic diagram of the anchoring assembly in the present utility model.

[0018] In the figure: 1. Platform bottom plate; 11. Platform base; 2. Mounting plate; 3. Screw; 4. Motor; 5. Electric support group; 6. Platform top seat; 7. Horizontal acceleration sensor; 8. Anchor assembly; 81. Windlass bottom plate; 82. Support column; 83. Bracket; 84. Chain drum; 85. Anchor chain; 86. Anchor; 87. Fixed pulley; 9. Support. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] The following first describes the concepts involved in this application with reference to the accompanying drawings. It should be noted that the following description of each concept is intended only to make the content of this application easier to understand and does not limit the scope of protection of this application. At the same time, the embodiments and features in the embodiments of this application can be combined with each other unless there is a conflict. The following detailed description of this application will be made with reference to the accompanying drawings and in conjunction with the embodiments.

[0021] Example

[0022] like Figures 1 to 3 As shown, the utility model provides an offshore drilling platform with motion compensation suitable for surge operations, including a platform bottom plate 1, a platform base 11 is fixedly installed on the platform bottom plate 1, a mounting plate 2 is slidably installed on the platform base 11, a screw 3 is rotatably installed in the platform base 11, and the screw 3 is threadedly connected to the mounting plate 2, a motor 4 for driving the screw 3 is fixedly installed on one side of the platform base 11, electric support groups 5 are fixedly installed at both ends of the mounting plate 2, and the tops of the two electric support groups 5 are fixedly connected to the same platform top seat 6 for placing a drilling rig.

[0023] As a further illustration of an embodiment of the present utility model, in the prior art, traditional floating platforms often have poor wave resistance when facing severe sea conditions such as swells, and the platforms are prone to large-scale shaking, which seriously affects the accuracy and safety of drilling operations. The construction and operation costs of self-elevating platforms are high, and they are difficult to apply in some areas with deep water. Therefore, in this embodiment, a new type of marine drilling platform with motion compensation suitable for swell operations is proposed. The platform integrates an advanced motion compensation system to achieve high-precision dynamic and stable control of the platform body under the action of swells, ensuring the smooth progress of drilling operations. Specifically, under swell sea conditions, the wave direction is relatively stable. For wave parameters such as swells with a wave height of H=2m and a period of T=10s, at a water depth of 40m, the floating platform will mainly exhibit vertical up and down motion and swing in the direction of the waves. The total amplitude of the forward and backward movement with the waves is approximately 4m, the amplitude of the up and down movement is approximately 2m, and the pitch amplitude is approximately ±1 / 10. To reduce the impact of waves on the platform, the floating platform is arranged along the waves and designed to have a length direction of no less than L / 4 (i.e., 25m) to ensure that the swing amplitude does not exceed the wave steepness and to avoid the occurrence of resonance. When the platform base plate 1 is impacted by a surge, the tilt angle of the platform top seat 6 is changed by adjusting the electric support group 5 (the electric support group 5 in this embodiment is composed of multiple electric support rods, and the multiple electric support rods are adjusted by a unified control system) and the motor 4 to drive the mounting plate 2, thereby alleviating the impact of the surge on the platform base plate 1. This makes the platform top seat 6 relatively stable and facilitates the operation of the drilling rig.

[0024] A further improvement of the technical solution of the present invention is that a horizontal acceleration sensor 7 for measuring the horizontal motion state of the platform top seat 6 in real time is fixedly installed on the bottom of the platform top seat 6.

[0025] As a further illustration of an embodiment of the present invention, a horizontal acceleration sensor 7 is mounted on the platform base plate 1 to measure the horizontal and vertical motion of the floating platform in real time. Using PID control, based on the sensor data, the motor 4 is controlled to drive the mounting plate 2, or the motorized support assembly 5 is adjusted to achieve automatic horizontal or vertical adjustment of the mounting plate 2 to compensate for the horizontal motion of the entire floating platform.

[0026] A further improvement of the technical solution of the present invention is that an anchoring assembly 8 for enhancing the stability of the platform base plate 1 is fixedly installed on the platform base plate 1 .

[0027] A further improvement of the technical solution of the present invention is that there are multiple anchoring assemblies 8 , and at least four of them are respectively arranged at the four corners of the platform base plate 1 .

[0028] A further improvement of the technical solution of the present utility model is that the anchor assembly 8 includes a windlass base plate 81, on which a support column 82 and a bracket 83 are fixedly installed, a chain drum 84 is rotatably connected inside the support column 82, an anchor chain 85 is coiled around the chain drum 84, and one end of the anchor chain 85 is fixedly installed with an anchor 86, and a fixed pulley 87 for receiving the anchor chain 85 is fixedly installed in the bracket 83.

[0029] As a further illustration of an embodiment of the present invention, in this embodiment, the platform baseplate 1 is fixedly mounted on a floating platform, with its range of motion controlled by anchoring assemblies 8. Due to the effects of wind, waves, and currents, the equilibrium position of the floating platform may shift. This shift cannot be fully mitigated by wave compensation, necessitating adjustments via anchoring assemblies 8. Consequently, a double "eight" pattern is employed, with anchoring systems positioned at each of the four corners of the platform baseplate 1. The anchor points of the anchoring system can be controlled through precise offshore positioning or drill pipe stress. Furthermore, the sensors and control systems of these components are integrated into the offshore drilling platform, and comprehensive system debugging is performed. Testing in a simulated surge environment verifies the platform's motion compensation effectiveness and the accuracy and safety of drilling operations.

[0030] A further improvement of the technical solution of the present invention is that a support 9 for supporting the platform top seat 6 is fixedly mounted on the mounting plate 2 .

[0031] As a further illustration of an embodiment of the present utility model, in this embodiment, when the platform top seat 6 is not adjusted by the electric support group 5 and the vertical height of the platform top seat 6 is at its lowest point, the support 9 supports the bottom of the platform top seat 6 .

[0032] As a further illustration of an embodiment of the present invention, in this embodiment, the platform baseplate is fixedly mounted on a floating platform, with the platform's range of motion controlled by anchoring assemblies. Due to the effects of wind, waves, and currents, the floating platform's equilibrium position may shift. This shift cannot be fully mitigated by wave compensation, necessitating adjustments with the aid of anchoring assemblies. To this end, a double "eight" anchor system is employed, with anchors positioned at each of the four corners of the platform baseplate. The anchor points of the anchoring system can be controlled through precise offshore positioning or drill pipe stress. Furthermore, the sensors and control systems of each of the aforementioned components are integrated into the offshore drilling platform, and comprehensive system debugging is performed. Testing in a simulated surge environment verifies the platform's motion compensation effectiveness and the accuracy and safety of drilling operations.

[0033] A further improvement of the technical solution of the present invention is that a support for supporting the platform top seat is fixedly installed on the mounting plate.

[0034] As a further illustration of an embodiment of the present utility model, in this embodiment, when the platform top seat is not adjusted by the electric support group and the vertical height of the platform top seat is at its lowest point, the support supports the bottom of the platform top seat.

[0035] The embodiments and / or implementation methods described above are only used to illustrate the preferred embodiments and / or implementation methods for realizing the technology of the present invention, and are not intended to limit the implementation methods of the technology of the present invention in any form. Any person skilled in the art may make slight changes or modifications to other equivalent embodiments without departing from the scope of the technical means disclosed in the content of the present invention, but they should still be regarded as technologies or embodiments that are essentially the same as the present invention.

[0036] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. The above is only the preferred implementation method of this application. It should be pointed out that due to the limitations of textual expression, there are objectively infinite specific structures. For ordinary technicians in this technical field, without departing from the principles of this application, they can make several improvements, modifications or changes, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the concept and technical solution of the utility model to other occasions without improvement, should be regarded as the scope of protection of this application.

Claims

1. A motion-compensated offshore drilling platform suitable for surge operations, comprising a platform base plate (1), characterized in that: A platform base (11) is fixedly mounted on the platform bottom plate (1), a mounting plate (2) is slidably mounted on the platform base (11), a screw (3) is rotatably mounted in the platform base (11), and the screw (3) is threadedly connected to the mounting plate (2), a motor (4) for driving the screw (3) is fixedly mounted on one side of the platform base (11), electric support groups (5) are fixedly mounted on both ends of the mounting plate (2), and the tops of the two electric support groups (5) are fixedly connected to the same platform top seat (6) for placing a drilling rig.

2. The offshore drilling platform with motion compensation suitable for surge operations according to claim 1, characterized in that: A horizontal acceleration sensor (7) for measuring the horizontal motion state of the platform top seat (6) in real time is fixedly mounted on the bottom of the platform top seat (6).

3. The offshore drilling platform with motion compensation suitable for surge operations according to claim 1, characterized in that: An anchoring assembly (8) for enhancing the stability of the platform base plate (1) is fixedly mounted on the platform base plate (1).

4. The offshore drilling platform with motion compensation suitable for surge operations according to claim 3, characterized in that: There are multiple anchoring assemblies (8), and at least four of the anchoring assemblies (8) are respectively arranged at the four corners of the platform bottom plate (1).

5. The offshore drilling platform with motion compensation suitable for surge operations according to claim 3, characterized in that: The anchor assembly (8) includes a windlass base plate (81), a support column (82) and a bracket (83) are fixedly mounted on the windlass base plate (81), a chain roller (84) is rotatably connected in the support column (82), an anchor chain (85) is wound around the chain roller (84), and an anchor (86) is fixedly mounted at one end of the anchor chain (85), and a fixed pulley (87) for receiving the anchor chain (85) is fixedly mounted in the bracket (83).

6. The offshore drilling platform with motion compensation suitable for surge operations according to claim 1, characterized in that: A support (9) for supporting the platform top seat (6) is fixedly mounted on the mounting plate (2).

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