A mechanism for equivalent realization of bending and swinging of a vertical pipe under action of ocean current

Abstract

The application discloses a kind of ocean current under the action of standpipe bending swing equivalent realization mechanism, comprising: bottom plate;Swing rod, rotatable be equipped in bottom plate, swing rod is equipped with along the extension direction of swing rod and is set up standpipe;Pushing assembly, the two ends of pushing assembly are connected to bottom plate and swing rod, pushing assembly is used to push swing rod rotation;Towing device, at least two are evenly arranged along swing rod, swing rod is connected with standpipe and is used to pull standpipe and bend along the direction perpendicular to swing rod and move.This application provides a kind of ocean current under the action of standpipe bending swing equivalent realization mechanism, swing rod can drive standpipe to swing adjustment within a certain range, two towing devices can drive standpipe to move and bend perpendicular to swing rod, so as to realize the dynamic bending deformation simulation experiment of standpipe system in deep sea, mechanism is simple and cost is lower.

Description

Technical Field

[0001] This invention relates to the field of simulation experimental equipment structure technology, and more specifically, to a mechanism for realizing the equivalent bending and swaying of a riser under the action of ocean currents. Background Technology

[0002] As a key facility in deepwater oil and gas development projects, the offshore riser system is the only channel connecting offshore floating installations to subsea pipelines (or subsea wellheads). Due to the long-term effects of floating body movement and harsh marine environments, offshore risers face a series of complex problems such as strength, fatigue, and interference, directly influencing engineering scheme selection and surface floating body design. They are a critical and controlling technology in deepwater engineering. Traditional multiphase flow theories within risers still rely on gas-liquid two-phase flow theories, neglecting the complex temperature and pressure field distribution within the riser under the harsh conditions of ultra-deepwater environments, the unique rheological properties of the fluid, and the dynamic large-displacement bending and vibration of the riser caused by external ocean currents. Therefore, they cannot accurately characterize the multiphase flow patterns within risers under the complex dynamic environment of deepwater development.

[0003] Currently, the research and experimental setups of scholars at home and abroad mainly focus on vertical tubes / inclined tubes / caten risers. However, none of the related structures can reflect the dynamic multi-degree-of-freedom large displacement bending deformation state of the riser under the complex environment of ultra-deep water, which is subjected to multiple factors such as gravity, buoyancy, random ocean current load, internal fluid pressure load, wave and floating body motion traction.

[0004] In conclusion, how to more accurately simulate the bending and swaying of risers under the influence of ocean currents is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide an equivalent realization mechanism for the bending and swaying of risers under the action of ocean currents, which can more accurately simulate the bending and swaying of risers under the action of ocean currents.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A mechanism for achieving the equivalent bending and swaying of a riser under ocean current conditions includes:

[0008] Base plate;

[0009] A rocker arm is rotatably mounted on the base plate, and a vertical tube is provided on the rocker arm along the extension direction of the rocker arm;

[0010] A pushing component, the two ends of which are respectively connected to the base plate and the rocker arm, the pushing component being used to push the rocker arm to rotate;

[0011] The traction device includes at least two traction devices evenly arranged on the rocker arm. The rocker arm is connected to the riser and is used to pull the riser to move and bend in a direction perpendicular to the rocker arm.

[0012] Preferably, each of the traction devices includes a rotating device and a traction rope. The rotating device is fixedly connected to the traction rope, and the traction rope is connected to the riser. The rotating device is used to drive the traction rope and enable the traction rope to move and bend the riser.

[0013] Preferably, the traction device further includes a bracket and two pulleys, the two pulleys being respectively located at both ends of the bracket, and the traction rope being wound around the pulleys and connected to the riser.

[0014] Preferably, the rotating device is provided with a groove, the traction rope is wound around the output end of the rotating device and the middle part of the traction rope is fixed to the groove, and the two ends of the traction rope are respectively wound around the pulleys at both ends of the same bracket and connected to the rotating clamp.

[0015] Preferably, the rotating clamp is slidably and rotatably disposed on the bracket, and the rotating clamp can slide along the bracket. The rotating clamp includes two clamping plates, two fixed shafts and two sets of pulleys, and the two ends of the traction rope are respectively connected to the two fixed shafts.

[0016] Preferably, the riser is mounted on the rocker arm by a clamp, the clamp including an upper clamp and a lower clamp, the upper clamp being rotatably disposed at the upper end of the rocker arm, and the lower clamp being rotatably disposed at the lower end of the rocker arm.

[0017] Preferably, the rocker arm is provided with a sliding groove, which is arranged along the extension direction of the rocker arm, and a plurality of through holes are evenly distributed in the sliding groove, which are used to install the upper clamp or the lower clamp.

[0018] Preferably, the pushing component is an electric actuator, the rocker arm is rotatably connected to the base plate via a hinge, one end of the electric actuator is rotatably connected to the rocker arm via the hinge, and the other end of the electric actuator is rotatably connected to the base plate via the hinge.

[0019] Preferably, the rocker arm is provided with a parallel balance bar, which is used to improve the structural strength of the rocker arm.

[0020] This invention provides a mechanism for simulating the bending and swaying of a riser under ocean currents. The mechanism includes a base plate, a rocker arm, a pushing component, and a traction device. Both the rocker arm and the pushing component are rotatably mounted on the base plate. The other end of the pushing component is connected to the rocker arm. At least two traction devices are provided and evenly distributed on the rocker arm. A riser is also mounted on the rocker arm, and the traction devices are connected to the riser. The rocker arm can drive the riser to swing and adjust within a certain range. The two traction devices can drive the riser to move and bend perpendicular to the rocker arm, thereby enabling a dynamic bending deformation simulation experiment of a riser system in the deep sea. The mechanism is simple and has a low cost. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0022] Figure 1 A schematic diagram of the structure of the equivalent mechanism for realizing the bending and swaying of the riser under the action of ocean currents provided by the present invention;

[0023] Figure 2 A schematic diagram of the hinge component provided by the present invention;

[0024] Figure 3 This is a schematic diagram of the structure of the pushing component provided by the present invention;

[0025] Figure 4 This is a schematic diagram of the structure of the upper clamp support member provided by the present invention;

[0026] Figure 5 This is a partial structural schematic diagram of the equivalent mechanism for realizing the bending and swaying of a riser under ocean current provided by the present invention;

[0027] Figure 6 This is a schematic diagram of the structure of the rotary clamp provided by the present invention;

[0028] Figure 7 This is a schematic diagram of the structure of the rotating wheel output end and traction rope assembly provided by the present invention.

[0029] Figure 8 This is a schematic diagram of the upper structure of the equivalent mechanism for realizing the bending and swaying of the riser under the action of ocean currents provided by the present invention.

[0030] Figures 1 to 8 In the accompanying drawings, the reference numerals include:

[0031] 1 is the base plate, 2 is the rocker arm, 3 is the riser, 4 is the push assembly, 5 is the traction device, 5-1 is the rotating device, 5-2 is the traction rope, 5-3 is the bracket, 5-4 is the pulley, 5-5 is the rotating clamp, 5-51 is the clamping plate, 5-52 is the fixed shaft, 5-53 is the pulley block, 6 is the upper clamp, 7 is the lower clamp, 8 is the slide groove, 9 is the balance bar, 10 is the hinge, and 11 is the upper clamp support. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] The core of this invention is to provide an equivalent mechanism for realizing the bending and swaying of risers under the action of ocean currents. This mechanism can more accurately simulate the bending and swaying of risers under the action of ocean currents.

[0034] It should be noted that the orientation or positional relationship indicated by terms such as "upper", "lower", "front", and "rear" is based on the orientation or positional relationship shown in the accompanying drawings and is only for the purpose of facilitating the description of this application and simplifying the description. It is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0035] This application provides a mechanism for realizing the equivalent bending and swaying of a riser under the action of ocean currents, comprising: a base plate 1, a swaying rod 2, a pushing component 4, and a traction device 5;

[0036] Among them, the base plate 1 is a plate-shaped component, and the base plate 1 is usually set on a fixed platform to ensure the stability of the structure;

[0037] The rocker arm 2 is rotatably mounted on the base plate 1. The rocker arm 2 is provided with a vertical tube 3 along the extension direction of the rocker arm 2. The vertical tube 3 can be a rigid straight tube or a flexible tube. The specific tube type is selected according to the experimental requirements.

[0038] The two ends of the push assembly 4 are connected to the base plate 1 and the rocker arm 2 respectively. The push assembly 4 is used to push the rocker arm 2 to rotate.

[0039] At least two traction devices 5 are provided and are evenly arranged on the rocker arm 2. The rocker arm 2 is connected to the riser 3 and is used to pull the riser 3 to move and bend in a direction perpendicular to the rocker arm 2.

[0040] For a marine riser installed below the sea surface, when it is subjected to ocean currents, the riser 3 is subjected to a certain thrust, which causes the riser 3 to move and bend, presenting a "C" shaped bend. When the length of the riser 3 reaches a sufficient length, the thrust it receives at different positions is not the same (when they are the same, it is still a "C" shaped bend). After the riser 3 presents a "C" shaped bend, there is also a swing bend at both ends caused by the movement of the riser 3, which makes the riser 3 present an "S" shaped bend.

[0041] Specifically, please refer to the attached diagram. Figure 1 The two ends of the rocker arm 2 are rotatably connected to the base plate 1 and the rocker arm 2, respectively. The rocker arm 2 can be rotated on the base plate 1 by the push assembly 4. The riser 3 and the traction device 5 are both set on the rocker arm 2. The riser 3 is set along the extension direction of the rocker arm 2. The traction device 5 can drive the riser 3 to move in a direction perpendicular to the rocker arm 2. It should be noted that when there are two traction devices 5, the two traction devices 5 will pull and stretch the riser 3 in different directions so that the riser 3 can bend in an "S" shape, thereby realizing the dynamic bending deformation simulation experiment of the riser system in the deep sea. The mechanism is simple and the cost is low.

[0042] Optionally, only one traction device 5 may be provided, and the traction device 5 may be located near the middle of the riser 3. The middle of the riser 3 can be pulled by the traction device 5, and the pulling direction can be perpendicular to the rocker arm 2, so that the riser 3 can be bent in a "C" shape.

[0043] Optionally, the rocker arm 2 can be made of aluminum profile, which is less expensive and easier to drill.

[0044] Based on the above embodiments, each traction device 5 includes a rotating device 5-1 and a traction rope 5-2. The rotating device 5-1 and the traction rope 5-2 are fixedly connected. The traction rope 5-2 is connected to the riser 3. The rotating device 5-1 is used to drive the traction rope 5-2 and enable the traction rope 5-2 to drive the riser 3 to move and bend.

[0045] Specifically, the rotating device 5-1 is preferably a rotating motor. The output end of the rotating motor is fixedly connected to the traction rope 5-2. The traction rope 5-2 is wound around the output end of the rotating motor and connected to the riser 3. The rotating motor is connected to the control system. The rotating motor can stretch and retract the traction rope 5-2. When the rotating motor stretches the traction rope 5-2, it can pull the riser 3 and make the riser 3 move and bend.

[0046] Based on the above embodiment, the traction device 5 also includes a bracket 5-3 and two pulleys 5-4. The two pulleys 5-4 are respectively located at both ends of the bracket 5-3, and the traction rope 5-2 is wound around the pulleys 5-4 and connected to the riser 3.

[0047] For details, please refer to the appendix. Figure 5 The bracket 5-3 is fixedly connected to the rocker arm 2. The bracket 5-3 is set perpendicular to the rocker arm 2. Two pulleys 5-4 are respectively set at the two ends of the bracket 5-3 and are symmetrical about the rocker arm 2. The rotating device 5-1 is set between the bracket 5-3 and the base plate 1. The traction rope 5-2 passes around the pulley 5-4 to ensure that the traction rope 5-2 is perpendicular to the rocker arm 2. When the traction rope 5-2 pulls the riser 3, it can ensure that the movement direction and bending direction of the riser 3 are both perpendicular to the rocker arm 2.

[0048] Based on the above embodiment, the rotating device 5-1 is provided with a groove, the traction rope 5-2 is wound around the output end of the rotating device 5-1 and the middle part of the traction rope 5-2 is fixed in the groove, and the two ends of the traction rope 5-2 are respectively wound around the pulleys 5-4 at both ends of the same bracket 5-3 and connected to the rotating clamp 5-5.

[0049] Specifically, the installation method for the traction rope 5-2 can be found in the appendix. Figure 7 The traction rope 5-2 passes around the rotating device 5-1 and wraps around it once. The two ends of the traction rope 5-2 can pass around two pulleys 5-4 respectively and are connected to the rotating clamp 5-5 at both ends. The rotating clamp 5-5 is used to clamp the riser 3. When the rotating device 5-1 starts rotating in the forward direction, the rotating device 5-1 can drive the traction rope 5-2 to move in the first direction. When the rotating device 5-1 starts rotating in the reverse direction, the rotating device 5-1 can drive the traction rope 5-2 to move in the second direction. It should be noted that the first direction and the second direction are both parallel to the bracket 5-3, and the first direction and the second direction are completely opposite.

[0050] Based on the above embodiment, the rotating clamp 5-5 is slidably and rotatably mounted on the bracket 5-3, and the rotating clamp 5-5 can slide along the bracket 5-3. The rotating clamp 5-5 includes two clamping plates 5-51, two fixed shafts 5-52 and two sets of pulleys 5-53. The two ends of the traction rope 5-2 are respectively connected to the two fixed shafts 5-52.

[0051] For details, please refer to the appendix. Figure 6 Each fixed shaft 5-52 is equipped with a pulley block 5-53. The two fixed shafts 5-52 are arranged parallel to each other, and the two fixed shafts 5-52 and the two clamping plates 5-51 are arranged in a rectangular pattern. The traction rope 5-2 passes around the pulley block 5-53. The traction rope 5-2 can drive the rotating clamp 5-5 to move and bend the riser 3. It should be noted that the rotating clamp 5-5 is rotatably mounted on the bracket 5-3 to accommodate the movement and bending of the riser 3.

[0052] In some embodiments, the riser 3 is mounted on the rocker arm 2 by a clamp, which includes an upper clamp 6 and a lower clamp 7. The upper clamp 6 is rotatably disposed at the upper end of the rocker arm 2, and the lower clamp 7 is rotatably disposed at the lower end of the rocker arm 2.

[0053] Specifically, both the upper clamp 6 and the lower clamp 7 are rotatably mounted on the rocker arm 2. This allows the riser 3 to swing and bend as it moves, depending on the position of the upper clamp 6 or the lower clamp 7, making the simulated bending effect of the riser 3 more realistic and reliable. The upper clamp 6 is mounted on the rocker arm 2 via the upper clamp support 11. Please refer to the attached diagram. Figure 4 The upper clamp support 11 can rotate freely in the plane, enabling the flexible tube to freely expand, contract, and rotate. The structure is designed to form a rotating clamp 5-5 by cooperating with bearing pulleys and U-shaped groove brackets. The gap between the two bearing pulleys is the diameter of the riser 3, so friction and deformation caused by the clamp when the hose bends need not be considered.

[0054] Optionally, the lower clamp 7 can be fixedly connected to the rocker arm 2 to ensure that the connection between the riser 3 and the lower clamp 7 remains stable and reliable.

[0055] Based on the above embodiment, the rocker arm 2 is provided with a sliding groove 8, which is arranged along the extension direction of the rocker arm 2. Multiple through holes are evenly distributed in the sliding groove 8, and the through holes are used to install the upper clamp 6 or the lower clamp 7.

[0056] Specifically, as shown in the attached document Figure 8 As shown, the rocker arm 2 is a hollow rod with grooves 8 on all four surfaces. Multiple through holes are also provided in the grooves 8, which are evenly distributed along the grooves 8. The positions of the upper clamp 6 and the lower clamp 7 can be set along the rocker arm 2. The upper clamp 6 and the lower clamp 7 are both composed of two Ω-shaped clamps and T-shaped nuts. One of the Ω-shaped clamps is provided with a nut, and the clamp and nut are preferably integrally formed so that the clamp and the rocker arm 2 can be detachably connected by a threaded connection, and the positions of the upper clamp 6 and the lower clamp 7 can be easily adjusted.

[0057] In some embodiments, the pushing component 4 is an electric actuator, the rocker arm 2 is rotatably connected to the base plate 1 via a hinge 10, one end of the electric actuator is rotatably connected to the rocker arm 2 via a hinge 10, and the other end of the electric actuator is rotatably connected to the base plate 1 via a hinge 10.

[0058] For details, please refer to the appendix. Figure 2 With appendix Figure 3Considering that the laboratory environment is not convenient for configuring pneumatic components and that the model uses multiple power components, the optimal choice for the push component 4 is an electric actuator with an encoder for the reciprocating swing motion. This will enable uniform reciprocating motion, withstand axial force, and control the reciprocating angle and swing frequency. Both ends of the electric actuator are hinged 10 and can be rotatably connected to the base plate 1 and the swing rod 2 to ensure freedom of movement.

[0059] Based on the above embodiment, the rocker arm 2 is provided with a parallel balance bar 9, which is used to improve the structural strength of the rocker arm 2.

[0060] Specifically, to achieve the same reciprocating swing angle, this experimental section aims to achieve ±30° reciprocation (with the direction perpendicular to the base plate 1 as 0°). The maximum displacement of the industrial electric actuator is selected as 600mm, providing a traction force of 1500N. Theoretical calculations show that the installation positions at both ends of the electric actuator connector are approximately 780mm and 950mm away from the rotation center of the hinge 10, respectively. To better observe the influence of pipe bending deformation on the multiphase flow pattern, the swing rod 2 is set to 4m. Considering that the 4m long swing rod 2 is upright and needs to perform reciprocating swing motion, it will generate stress and strain, forming bending displacement that affects the experimental results. To reduce deformation, the general swing rod is improved into a rectangular double rod to improve the structural strength of the swing rod 2.

[0061] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0062] The foregoing has provided a detailed description of the equivalent mechanism for realizing the bending and swaying of a riser under ocean current conditions, as provided by this invention. Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core ideas of this invention. It should be noted that those skilled in the art can make various improvements and modifications to this invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this invention.

Claims

1. A mechanism for achieving the equivalent bending and swaying of a riser under ocean current, characterized in that, include: Base plate (1); A rocker arm (2) is rotatably mounted on the base plate (1), and a vertical tube (3) is provided on the rocker arm (2) along the extension direction of the rocker arm (2). A push assembly (4) is provided, with its two ends connected to the base plate (1) and the rocker arm (2) respectively. The push assembly (4) is used to push the rocker arm (2) to rotate. The traction device (5) is provided with at least two and is evenly arranged on the rocker arm (2). The rocker arm (2) is connected to the riser (3) and is used to pull the riser (3) to move and bend in a direction perpendicular to the rocker arm (2). Each of the traction devices (5) includes a rotating device (5-1) and a traction rope (5-2). The rotating device (5-1) is fixedly connected to the traction rope (5-2). The traction rope (5-2) is connected to the riser (3). The rotating device (5-1) is used to drive the traction rope (5-2) and enable the traction rope (5-2) to drive the riser (3) to move and bend. The traction device (5) also includes a bracket (5-3) and two pulleys (5-4). The two pulleys (5-4) are respectively located at both ends of the bracket (5-3). The traction rope (5-2) is wound around the pulleys (5-4) and connected to the riser (3). The rotating device (5-1) is provided with a groove, the traction rope (5-2) is wound around the output end of the rotating device (5-1) and the middle part of the traction rope (5-2) is fixed in the groove, and the two ends of the traction rope (5-2) are respectively wound around the pulleys (5-4) at both ends of the same bracket (5-3) and connected to the rotating clamp (5-5). The rotating clamp (5-5) is slidably and rotatably mounted on the bracket (5-3), and the rotating clamp (5-5) can slide along the bracket (5-3). The rotating clamp (5-5) includes two clamping plates (5-51), two fixed shafts (5-52) and two sets of pulleys (5-53). The two ends of the traction rope (5-2) are respectively connected to the two fixed shafts (5-52).

2. The equivalent mechanism for realizing the bending and swaying of a riser under ocean current as described in claim 1, characterized in that, The riser (3) is installed on the rocker arm (2) by a clamp. The clamp includes an upper clamp (6) and a lower clamp (7). The upper clamp (6) is rotatably located at the upper end of the rocker arm (2), and the lower clamp (7) is rotatably located at the lower end of the rocker arm (2).

3. The equivalent mechanism for realizing the bending and swaying of a riser under ocean current as described in claim 2, characterized in that, The rocker arm (2) is provided with a groove (8), which is arranged along the extension direction of the rocker arm (2). Multiple through holes are evenly distributed in the groove (8), and the through holes are used to install the upper clamp (6) or the lower clamp (7).

4. The equivalent mechanism for realizing the bending and swaying of a riser under ocean current as described in claim 1, characterized in that, The pushing component (4) is an electric actuator. The rocking rod (2) is rotatably connected to the base plate (1) through a hinge (10). One end of the electric actuator is rotatably connected to the rocking rod (2) through the hinge (10), and the other end of the electric actuator is rotatably connected to the base plate (1) through the hinge (10).

5. The equivalent mechanism for realizing the bending and swaying of a riser under ocean current action according to any one of claims 1 to 4, characterized in that, The rocker arm (2) is provided with a parallel balance bar (9), which is used to improve the structural strength of the rocker arm (2).

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