A parametric deformation marine riser fairing suppression device

Abstract

The present invention relates to a parametrically deformable marine riser fairing suppression device, which mainly includes a support part, a rotating part, a shell part, a parametric deformation part, and a servo control part. First, the fairing suppression device rotates to a corresponding position according to the ocean currents in different directions, and then the PLC sends a corresponding number of pulse signals to the servo motor according to the input position parameters. Each deformation part of the deformation part can reach a specified deformation position according to the number of pulse signals, and finally the shell part is connected by an articulated joint and a large support plate to achieve parametric deformation. The parametric deformable structure adopted by the device can optimize the external structure by changing the cross-sectional shape of the fairing suppression device in real time, and realize the optimal control of the shape of the marine riser fairing suppression device, thereby achieving the optimal vortex-induced vibration suppression effect.

Description

Technical Field

[0001] The invention relates to a parametrically deformable marine riser fairing suppression device, in particular to a marine riser vortex-induced vibration suppression device used in the field of marine oil and gas drilling and production. Background Art

[0002] Marine risers are core equipment in the field of deepwater oil and gas drilling and production. In deep water, marine risers can be regarded as flexible bodies. When underwater currents flow through marine risers, periodic vortices will be formed behind them. The detachment of the vortex will cause the marine riser to move periodically, causing vortex-induced vibration of the marine riser. When the vortex detachment frequency is close to the natural frequency of the marine riser, the vortex-induced vibration of the marine riser will be enhanced, and fatigue failure accidents are prone to occur, which will cause economic losses, environmental losses and casualties. The traditional marine riser vortex-induced vibration suppression device has a simple structure, small or even no deformation ability, and cannot adapt to the complex and changeable marine environment; the more novel suppression device lacks parametric control of the deformation of the suppression device. In order to solve the above problems, a parametrically deformable marine riser fairing suppression device is proposed. The shape of the vortex-induced vibration suppression device is actively controlled to change according to different marine environments, so as to achieve marine riser vortex-induced vibration suppression in different marine environments. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a parametrically deformable marine riser fairing suppression device, which can adjust the shape of its own fairing shell according to different sea conditions to achieve the best effect of suppressing vortex-induced vibration.

[0004] The present invention is realized by the following technical scheme: a parametrically deformable marine riser fairing suppression device, characterized in that it includes a supporting part, a rotating part, a shell part, a parametric deformation part, and a servo control part.

[0005] The supporting part includes a supporting sleeve and a fixed base, which play the role of supporting and installing and positioning.

[0006] The rotating part includes a marine riser and a bearing. The inner ring of the bearing cooperates with the outer ring of the riser, and the outer ring of the bearing cooperates with the inner ring of the support sleeve, so that the parametrically deformable marine riser fairing suppression device can rotate around the marine riser.

[0007] The shell part comprises a composite shell, an articulated joint, and an elastic body. The shell part adopts a segmented structure and is articulated with the parametric deformation part.

[0008] The parameterized deformation part includes deformation component one, deformation component two, deformation component three, and deformation component four. The deformation components can realize independent deformation control of the shell part, wherein the deformation component one and deformation component two include closed-loop servo motor, gear, rack, shell connecting part, etc., the gear is meshed with the rack to convert the rotational motion of the servo motor into the linear motion of the shell connecting part, the deformation component three includes closed-loop servo motor, bevel gear, ball screw, screw nut, diamond connecting rod mechanism, etc., the meshing of the bevel gear and the cooperation of the screw nut and the ball screw convert the rotational motion of the servo motor into the synchronous relative linear motion of the diamond connecting rod mechanism, the deformation component four includes closed-loop servo motor, gear, ball screw, screw nut, large support plate, etc., the gear drives the ball screw to rotate through meshing, the cooperation of the ball screw and the screw nut converts the rotational motion of the servo motor into the rotational motion of the large support plate, and the combined motion of the four deformation components realizes the deformation of the shell part.

[0009] Furthermore, the servo control part includes a servo driver, a PLC, and a data line. The servo motor and the servo motor driver are installed on the fixed base and are directly connected through the data line. The servo motor driver is connected to the PLC. The PLC sends a corresponding number of pulse signals to the servo motor according to the input position parameters. Each deformation component of the deformation part can reach a specified deformation position according to the number of pulse signals. By changing the position parameters input to the PLC, parametric deformation control of the marine riser fairing suppression device is achieved.

[0010] Due to the adoption of the above technical scheme, the present invention has the following advantages: 1. The present invention adopts an outer shape parameterized deformation marine riser fairing suppression device, which can change the vortex separation frequency by changing the shape of the fairing shell, reduce the vortex-induced vibration intensity, and has a good vortex-induced vibration suppression effect; 2. The present invention can make the fairing shell achieve optimal control of vortex-induced vibration by changing the shape under different marine conditions, and can achieve adaptive suppression of marine riser vortex-induced vibration under different marine environments, with strong adaptive ability; 3. The mechanical deformation mechanism designed by the present invention has a simple structure, can achieve parametric control, and has relatively high stability and reliability. The present invention has good suppression effect, strong adaptability, and high reliability, and can be widely used in various marine oil and gas drilling operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0012] Figure 2 It is a schematic diagram of the internal structure of the present invention.

[0013] Figure 3-Figure 5 It is a schematic diagram of the mechanical transmission of the present invention.

[0014] Figure 6 It is a schematic diagram of the structure of the rotatable part of the present invention.

[0015] Figure 7 It is a schematic diagram of the structure of the fairing shell of the present invention.

[0016] In the figure, 1. composite material housing, 2. servo motor driver, 3. marine riser, 4. angular contact ball bearing, 5. support sleeve, 6. fixed base, 7. closed-loop servo motor, 8. closed-loop servo motor, 9. frame, 10. slider, 11. rack, 12. gear, 13. slide rail, 14. limit switch, 15. coupling 16. ball screw, 17. housing connector, 18. bevel gear, 19. connecting rod mechanism, 20. large support plate, 21. screw nut, 22. drive shaft, 23. small support plate, 24. bearing support, 25. elastic rubber thin layer, 26. elastomer, 27. aluminum alloy layer, 28. articulated joint, 29. elastic film. DETAILED DESCRIPTION

[0017] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0018] like Figure 1 , Figure 2 , Figure 6 As shown, the marine riser 3 is connected with the angular contact ball bearing 4, and the angular contact ball bearing 4 is connected with the support sleeve 5 by interference fit. The support sleeve 5 drives the entire structure to rotate around the marine riser 3, so as to realize automatic adjustment of the orientation of the parametric deformation marine riser fairing suppression device under different sea conditions.

[0019] like Figure 2 , Figure 3 As shown, the closed-loop servo motor 7 is fixed on the frame 9, and the closed-loop servo motor 7 is positioned by tightening screws. The frame 9 is fixed to the fixed base 6, and the frame 9 is positioned by tightening bolts. The closed-loop servo motor 7 is connected to the gear 12, the gear 12 is meshed with the rack 11, and the rack 11 is fixed to the slider 10 through the slider connector using the tightening screws. The slider 10 is installed on the slide rail 13, and the slide rail 13 is fixed to the frame 9. The gear 12 is meshed with the rack 11 to convert the rotational motion of the closed-loop servo motor 7 into the linear motion of the slider 10. The housing connector 17 at the end of the rack 11 contacts the composite housing 1, thereby pushing the composite housing 1 to deform, and the deformation range of the composite housing 1 is controlled by the limit switch 14.

[0020] like Figure 2 , Figure 4As shown, the closed-loop servo motor 7 is fixed on the frame 9, and the closed-loop servo motor 7 is positioned by the set screws. The frame 9 is fixed to the fixed base 6, and the frame 9 is positioned by the fastening bolts. It is connected to the coupling 15, the coupling 15 is connected to the bevel gear 18, the three bevel gears 18 are meshed, the bevel gear 18 is fixedly connected to the ball screw 16, the ball screw 16 is cooperatively connected to the bearing support 24, the bearing support 24 is fixed to the frame 9 by fastening bolts, the screw nut 21 is installed on the ball screw 16, the bevel gear 18 cooperates with the ball screw 16 to convert the rotational motion of the closed-loop servo motor 7 into the horizontal linear motion of the screw nut 21, the screw nut 21 is fixed to the slider 10 through the shaft to achieve the stability of the motion, the connecting rod mechanism 19 is fixed to the screw nut 21 through the shaft, and the connecting rod mechanism 19 is used to convert the horizontal linear motion of the screw nut 21 into the vertical linear motion of the shell connecting member 17, the shell connecting member 17 contacts with the composite shell 1, thereby pushing the composite shell 1 to deform, and the deformation range of the composite shell 1 is controlled by the limit switch 14.

[0021] like Figure 2 , Figure 5 As shown, the closed-loop servo motor 8 is fixed on the frame 9, and the closed-loop servo motor 8 is positioned by tightening screws. The frame 9 is fixed to the fixed base 6, and the frame 9 is positioned by tightening bolts. Connected to the gear 12, a pair of gears 12 mesh with each other, the gear 12 is fixed to the ball screw 16, the ball screw 16 is connected to the bearing support 24, the bearing support 24 is fixed to the frame 9 by fastening bolts, the screw nut 21 is installed on the ball screw 16, a pair of gears 12 meshing to convert the rotational motion of the closed-loop servo motor 8 into the linear motion of the screw nut 21, one end of the drive shaft 22 is fixed to the ball screw 16, and the other end is fixed to the slider 10, the slider 10 is installed on the slide rail 13, the slide rail 13 is fixed to the middle plate, the small support plate 23 is hinged to the drive shaft 22, the large support plate 20 is hinged to the small support plate 23, the linear motion of the screw nut 21 is converted into the rotational motion of the large support plate 20, the large support plate 20 is in contact with the composite material shell 1, thereby pushing the entire composite material shell 1 to deform.

[0022] like Figure 1 As shown, the composite material shell 1 is fixed on the supporting sleeve 5 to realize the positioning of the front end, the inside of the composite material shell 1 contacts the ends of the four deformation components, and the closed-loop servo motor 7 or the closed-loop servo motor 8 drives the ends of the deformation components to move through the intermediate mechanism, thereby pushing the composite material shell 1 to deform, and then adjusting the shape of the composite material shell 1 to reach the optimal state, thereby affecting the vortex shedding frequency and shedding position, achieving the purpose of suppressing vortex-induced vibration, and at the same time achieving the shape of the composite material shell 1 to reach the optimal state under different sea conditions.

[0023] like Figure 1 , Figure 2 As shown, the closed-loop servo motor 7 or the closed-loop servo motor 8 is connected to the servo motor driver 2 via a data line, and the PLC transmits pulses to control the rotation of the closed-loop servo motor 7 or the closed-loop servo motor 8, thereby realizing parameterized control of the deformation of the composite material shell 1.

[0024] like Figure 7 As shown, the composite shell 1 is a four-layer structure, wherein the three inner layers are respectively the middle aluminum alloy layer 27 and the elastic rubber thin layer 25 wrapped on both sides, which can ensure that the composite shell 1 has a certain rigidity and also has a large flexibility; the rear end of the composite shell 1 is connected by an elastomer 26, which can ensure that the composite shell 1 always remains in a closed state when the rear end of the composite shell 1 is deformed. The outermost elastic film 29 covers the composite shell 1 to achieve the sealing of the fairing. The composite shell 1 is connected in sections through an articulated joint 28. When deformed, the articulated joint 28 can slide and bend in the composite shell 1, and can achieve relative rotation to compensate for the displacement of the composite shell 1 during deformation. The cross section of the fairing can achieve teardrop-shaped, dovetail-shaped, and fish-fin-shaped deformation, and has a good cross-sectional shape, which can significantly reduce the frequency of vortex separation, reduce the intensity of vortex-induced vibration, and extend the service life of the marine riser.

[0025] The beneficial effect of the method of the present invention is as follows: a parametrically deformable marine riser fairing suppression device is proposed, which uses a deformable mechanical structure, combined with the drive of a closed-loop servo motor, and is controlled by sending commands through a high-performance PLC. Vortex-induced vibration can be suppressed by changing the shape of the fairing shell in different marine environments, thereby reducing fatigue damage to the marine riser caused by vortex-induced vibration and extending its service life.

[0026] The present invention is not limited to the above-mentioned specific implementation modes. According to the above-mentioned contents, in accordance with the common technical knowledge and customary means in the field, without departing from the above-mentioned basic technical ideas of the present invention, the present invention can also make other various forms of equivalent modifications, replacements or changes, all of which belong to the protection scope of the present invention.

Claims

1. A parametrically deformable marine riser fairing suppression device, characterized in that: It includes a support part, a rotating part, a shell part, a parametric deformation part, and a servo control part. The support part includes a support sleeve and a fixed base, which play the role of support and installation positioning. The rotating part includes a marine riser and a bearing, wherein the inner ring of the bearing cooperates with the outer ring of the riser, and the outer ring of the bearing cooperates with the inner ring of the support sleeve, so as to realize the rotational movement of the parametric deformation marine riser fairing suppression device around the marine riser. The shell part comprises a composite shell, an articulated joint, and an elastic body. The shell part adopts a segmented structure and is articulated with the parametric deformation part. The parameterized deformation part includes deformation component one, deformation component two, deformation component three, and deformation component four. The shell connector at the end of the rack contacts the composite shell, thereby pushing the composite shell to deform. The large support plate is hinged to the small support plate, and the linear motion of the lead screw nut is converted into the rotational motion of the large support plate. The large support plate contacts the composite shell, thereby pushing the composite shell to deform. The deformation components can realize independent deformation control of the shell part. The deformation component one and the deformation component two include a closed-loop servo motor, a gear, a rack, and a shell connector. The gear is meshed with the rack to convert the rotational motion of the closed-loop servo motor into the linear motion of the shell connector. The deformation component three includes a closed-loop servo motor, a bevel gear, and a ball screw. The gears are engaged to drive the ball screw to rotate, and the ball screw and the screw nut cooperate to convert the rotational motion of the closed-loop servo motor into the synchronous relative linear motion of the diamond-shaped linkage mechanism. The linkage mechanism is used to convert the horizontal linear motion of the screw nut into the vertical linear motion of the shell connecting piece. The shell connecting piece contacts the composite shell, thereby pushing the composite shell to deform. The fourth deformation component includes a closed-loop servo motor, a gear, a ball screw, a screw nut, and a large support plate. The gears drive the ball screw to rotate by engagement. The cooperation of the ball screw and the screw nut converts the rotational motion of the servo motor into the rotational motion of the large support plate. The combined motion of the four deformation components realizes the deformation of the shell part. The servo control part includes a servo motor driver, a PLC, and a data line. The composite shell is divided into a four-layer structure. The inner three-layer structure is composed of an aluminum alloy layer in the middle and elastic rubber thin layers wrapped on both sides, which can ensure that the composite shell has a certain rigidity and deformation ability. The rear end of the composite shell is connected with an elastomer, which can ensure that the composite shell always remains in a closed state when the rear end of the composite shell is deformed. The outermost elastic film makes the fairing suppression device have a smooth streamlined shape. The composite shell is connected in sections through the articulated joint. When deformed, the articulated joint can slide and bend in the composite shell, and can achieve relative rotation to compensate for the displacement of the composite shell during deformation. The shell part can achieve teardrop-shaped, dovetail-shaped, and fish-fin-shaped deformation, which can significantly reduce the vortex separation frequency, reduce the vortex-induced vibration intensity, and extend the service life of the marine riser.

2. A parametrically deformable marine riser fairing suppression device according to claim 1, characterized in that: The bearing is an angular contact ball bearing, the vertical pipe and the inner ring of the angular contact ball bearing are interference fit, and the outer ring of the angular contact ball bearing and the inner ring of the support sleeve are interference fit.

3. The parametrically deformable marine riser fairing suppression device according to claim 1, characterized in that: The servo motor and the servo motor driver are installed on the fixed base and are directly connected through the data line. The servo motor driver is connected to the PLC. The PLC sends a corresponding number of pulse signals to the servo motor according to the input position parameters. Each deformation component of the deformation part reaches a specified deformation position according to the number of pulse signals. The parametric deformation control of the marine riser fairing suppression device is achieved by changing the position parameters input to the PLC.

Images