CN104712266B - A kind of active and passive control synergistic standpipe equipment for inhibiting of vibration and method - Google Patents

Abstract

The invention relates to a riser vibration suppressing device and method with synergistic active and passive control. The device consists of two symmetrical rotating assemblies, a short separating disc, a long separating disc, two control rods with left-handed spiral ribs and Consists of two control levers with right-hand helical ribs. When seawater impacts on the device, the four control rods with spiral ribs can rotate around their respective central axes to inject energy into the boundary layer of the standpipe's flow, and realize the energy-free active control of the riser vibration. The short separation disk and the long separation disk divide the space for the development of the wake vortex, further destroy the development of the wake vortex, and realize the passive control of the riser vibration. This device overcomes the high energy consumption of traditional active control and the singleness of passive control, combines the advantages of active and passive control, and can effectively suppress the vibration of the riser.

Description

A riser vibration suppression device and method with active and passive control synergy

technical field

The invention belongs to the technical field of laying of marine riser facilities, and in particular relates to a riser vibration suppression device and method with active and passive control synergy.

Background technique

At present, my country's onshore oil and gas resources are in short supply, and the development of offshore oil and gas is not high enough, forcing the dependence on foreign oil and gas to increase steadily, and the energy crisis is highlighted. Therefore, vigorously developing offshore oil and gas, especially deep-sea oil and gas resources, is a key measure to reverse this situation. As the "life passage" of offshore platforms and underwater wellheads, whether the marine riser can work normally in the harsh marine environment is a key factor that determines the efficient and safe development of deep-sea oil and gas. When seawater flows through the riser, due to the separation of the boundary layer around the flow, alternate shedding vortices will be formed on both sides of the riser, thereby exciting the riser to vibrate. With the increase of development depth, the length-to-diameter ratio of the marine riser increases, the flexibility of the riser increases, and the probability of fatigue failure of the riser caused by vortex-induced vibration becomes higher and higher. Once the riser fails, it will not only cause serious economic losses, but also cause irreparable damage to the surrounding marine ecological environment. Therefore, it is urgent to design a device that can effectively suppress the vibration of the riser.

Existing marine riser vibration suppression devices are mainly divided into two types: active control and passive control. Among them, the active suppression device requires additional energy input, the connection is relatively complicated, and the working conditions are relatively harsh, but the suppression effect is obvious. The passive suppression device mainly achieves vibration suppression by changing the shape of the pipe string, including separation discs, fairings, auxiliary cylinders, spiral strakes, spoiler ribbons, etc., of which the separation discs, fairings, and spoiler streamers are only applicable to specific directions. The incoming flow, and the suppression effect is general. However, the direction of the actual sea current changes rapidly, and it is urgent to design a vibration suppression device that can adapt to multi-directional incoming currents and combines the advantages of active and passive control.

Contents of the invention

The problem to be solved by the present invention is to provide a simple structure, reliable performance, combined with the advantages of active and passive control, and can be applied to the coordination of active and passive control of incoming flow in different directions, aiming at the shortcomings of existing marine riser vibration suppression devices. An active riser vortex-induced vibration suppression device and method.

In order to achieve the above object, the present invention adopts the following technical solutions:

A riser vibration suppression device with active and passive control synergy consists of upper and lower symmetrical rotating assemblies, a short separation disc, a long separation disc, two control rods with left-hand spiral ribs and two control rods with right-hand spiral ribs composition. The rotating assembly is composed of an inner ring and an outer ring nested together; the inner ring is composed of two symmetrical half-ring steel components, which are fitted on the standpipe from both sides and fixed by bolts; the outer surface of the inner ring is processed with a T-shaped The chute; the outer ring is also composed of two symmetrical half-ring steel members, each half-ring member has a rectangular parallelepiped socket in the center, and two round holes symmetrical to the rectangular parallelepiped socket are opened on the half ring. There are limit steps, and the angle between the center of the two round holes and the center of the outer ring is 90°; the inner surface of the half-ring member between the two round holes is processed with a T-shaped buckle with an arc length of 90°; the outer ring Put it on the outer side of the inner ring, and make the T-shaped buckle screw into the T-shaped chute of the inner ring, and fix it through bolt connection. Both ends of the short separation disc and the long separation disc are processed with cuboid pins, and the cuboid pins are inserted into the cuboid sockets on the outer ring to realize the fixing of the short separation disc and the long separation disc. Left-hand spiral ribs are processed on the control lever with left-hand spiral ribs, right-hand spiral ribs are processed on the control lever with right-hand spiral ribs; both ends of the control lever with left-hand spiral ribs and right-hand spiral ribs are processed with convex rings, One control lever with left-hand helical rib and one control lever with right-hand helical rib are respectively inserted into the round holes on the left and right sides of the short separation disc facing away from the riser, the other control lever with left-hand helical rib and the other with right-hand helical rib The control rods are respectively inserted into the round holes on the left and right sides of the long separation disc facing away from the standpipe, and the outer convex ring contacts the limit steps in the round holes. Two control rods with left-hand spiral ribs and two control rods with right-hand spiral ribs are clamped between the round holes of the outer rings of the upper and lower rotating components. Helical ribbed levers and levers with right-handed helical ribs rotate about their central axis.

Among them, the spiral outer diameter d of the control rod with left-hand spiral ribs and the control rod with right-hand spiral ribs is 0.05 to 0.2 times the outer diameter D of the riser, and the length H of the control rod with left-hand spiral ribs and the control rod with right-hand spiral ribs is 5D ~8D. The gap G1 between the control rod with left-hand spiral rib and the control rod with right-hand spiral rib and the standpipe ₁ is 0.1D～0.6D, and the gap G2 between the short separation disc and the long separation disc and the stand pipe ₁ is 0.1D ~0.6D.

A standpipe vibration suppression device with active and passive control synergy can provide a riser vibration suppression method with active and passive control synergy. A rotational moment around the shaft of the riser pipe will be generated, so that the short separation disc and the long separation disc drive the rotating assembly and two control rods with left-hand helical ribs and two control rods with right-hand helical ribs to rotate around the shaft of the riser pipe until The short and long separation discs are parallel to the water flow. The left-hand spiral rib with the left-hand spiral rib control lever will drive the control lever with the left-hand spiral rib to rotate clockwise after being impacted by the water flow, and the right-hand spiral rib with the right-hand spiral rib control lever will drive the control lever with the right-hand spiral rib to rotate clockwise after being impacted by the water flow Anticlockwise rotation. The left and right sides of the short separation disc and the long separation disc facing away from the standpipe are equipped with left-hand spiral rib control rods and right-hand spiral rib control rods, which rotate around their respective central axes to inject energy into the boundary layer of the flow around the standpipe and delay the separation of the boundary layer point, which weakens the strength of vortex shedding and reduces the size of the shedding vortex, thereby realizing energy-free active control of riser vibration. The short separation disk and the long separation disk divide the space for the development of the wake vortex, further destroying the development of the wake vortex, thereby realizing the passive control of the riser vibration. Under the synergistic effect of such active and passive control, the vibration of the riser can be effectively suppressed.

The present invention has the following advantages due to the adoption of the above technical scheme:

1. The invention can realize free rotation, is suitable for vibration suppression of incoming flow in all directions, and adapts to the real ocean environment where the flow direction changes rapidly;

2. This device overcomes the high energy consumption of traditional active control and the singleness of passive control, combines the advantages of active and passive control, and realizes the synergy of active and passive control;

3. The active control rod with spiral ribs and the separation disc of this device are made of plastic, which responds quickly to the rotation of the impact of the water flow, and can provide a certain buoyancy for the riser at the same time, with low cost and easy replacement.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the present invention

Fig. 2 is a schematic diagram of the structure of the inner ring of the present invention

Fig. 3 is a structural schematic diagram of the outer ring of the present invention, the control rod with left-hand spiral ribs and the control rod with right-hand spiral ribs

Fig. 4 is A-A sectional schematic diagram of the present invention

Fig. 5 is a structural schematic diagram of the short separation disc and the long separation disc of the present invention

Fig. 6 is the working schematic diagram of the present invention after being impacted by water flow

Among them: 1. Riser; 2. Inner ring; 3. Outer ring; 4. T-shaped buckle; 5. T-shaped chute; 6. Short separation disc; 7. Long separation disc; 8. With left-hand spiral rib control Rod; 9. Control rod with right-hand spiral rib; 10. Round hole; 11. Cuboid jack; 12. Cuboid pin; 13. Limiting step; 14. Outward convex ring; 15. Left-hand spiral rib; rib.

detailed description

The specific implementation of the present invention will be further described below in conjunction with accompanying drawing:

As shown in Figure 1, a riser vibration suppression device with active and passive control synergy consists of two symmetrical rotating assemblies, the upper and lower, the short separation disc 6, the long separation disc 7, and two control rods 8 with left-handed spiral ribs. Form with two belt right-hand helical rib control rods 9. The rotating assembly is composed of an inner ring 2 and an outer ring 3 nested together; as shown in Figure 2, the inner ring 2 is composed of two symmetrical half-ring steel components, which are fitted on the riser 1 from both sides and fixed by bolts ; The outer surface of the inner ring 2 is processed with a circle of T-shaped chute 5; as shown in Figure 3 and Figure 4, the outer ring 3 is also composed of two symmetrical half-ring steel components, and a cuboid socket is opened in the middle of each half-ring component 11, and two round holes 10 symmetrical to the cuboid socket 11 are opened on the half ring, and a limit step 13 is arranged in the round hole 10, and the angle between the center of the two round holes 10 and the center of the outer ring 3 is 90° ; A T-shaped buckle 4 with an arc length angle of 90° is processed on the inner surface of the half-ring member between the two round holes 10; the outer ring 3 is set on the outer side of the inner ring 2, and the T-shaped buckle 4 is screwed into the inner ring The T-shaped chute 5 of 2 is fixed by bolt connection. As shown in Figure 1 and Figure 5, both ends of the short separation disc 6 and the long separation disc 7 are processed with cuboid pins 12, and the cuboid pins 12 are inserted into the cuboid jacks 11 on the outer ring 3 to realize the separation of the short separation disc 6 and the long separation disc. Fixing of disc 7. As shown in Figure 1 and Figure 6, left-hand spiral ribs 15 are processed on the control rod 8 with left-hand spiral ribs, and right-hand spiral ribs 16 are processed on the control rod 9 with right-hand spiral ribs; Both ends of the rib control rod 9 are processed with convex rings 14, and a control rod 8 with a left-hand spiral rib and a control rod 9 with a right-hand spiral rib are respectively inserted into the left and right sides of the short separation disc 6 facing away from the standpipe 1 The round hole 10, another control rod 8 with left-hand spiral ribs and another control rod 9 with right-hand spiral ribs are respectively inserted into the round holes 10 on the left and right sides of the long separation disc 7 facing away from the standpipe 1, and make the outer convex ring 14 contacts the limiting step 13 in the circular hole 10 . Two control rods 8 with left-handed spiral ribs and two control rods 9 with right-hand spiral ribs are clamped between the round holes 10 of the outer rings 3 of the upper and lower rotating components, and the convex ring 14 is aligned with the limit step 13 Contact can make the control rod 8 with the left-hand helical rib and the control rod 9 with the right-hand helical rib rotate around its central axis.

Among them, the spiral outer diameter d of the control rod 8 with left-hand spiral ribs and the control rod 9 with right-hand spiral ribs is 0.05 to 0.2 times the outer diameter D of the riser 1, and the control rod 8 with left-hand spiral ribs and the control rod 9 with right-hand spiral ribs The length H is 5D-8D. The gap G1 between the control rod 8 with left-hand spiral ribs and the control rod 9 with right-hand spiral ribs and the standpipe ₁ is 0.1D to 0.6D, and the gap G between the short separation disc 6 and the long separation disc 7 and the stand pipe 1 ₂ is 0.1D to 0.6D.

A standpipe vibration suppression device with active and passive control synergy can provide a riser vibration suppression method with active and passive control synergy. Different, there will be a rotational moment around the pipe axis of the standpipe 1, so that the short separation disc 6 and the long separation disc 7 drive the rotating assembly and two control rods 8 with left-hand spiral ribs and two control rods 9 with right-hand spiral ribs to wind together Standpipe 1 pipe shaft rotates until the short separation disc 6 and the long separation disc 7 are parallel to the flow direction of the water flow. The left-hand spiral rib 15 with the left-hand spiral rib control lever 8 will drive the left-hand spiral rib control lever 8 to rotate clockwise after being impacted by the water flow, and the right-hand spiral rib 16 with the right-hand spiral rib control lever 9 will drive the right-hand spiral rib 16 after being impacted by the water flow. The spiral rib control rod 9 rotates counterclockwise. The left-hand spiral rib control rod 8 and the right-hand spiral rib control rod 9 on the left and right sides of the short separation disc 6 and the long separation disc 7 facing away from the standpipe 1 rotate around their respective central axes to inject energy into the boundary layer around the standpipe 1, Delaying the separation point of the boundary layer weakens the strength of the vortex shedding and reduces the size of the shedding vortex, thereby realizing energy-free active control of the vibration of the standpipe 1 . The short separation disc 6 and the long separation disc 7 divide the space for the development of the wake vortex, further destroying the development of the wake vortex, thereby realizing the passive control of the vibration of the riser 1 . Under the cooperative action of such active and passive control, the vibration of the riser 1 can be effectively suppressed.

Example:

When installing this device, first install the rotating assembly below, put the inner ring 2 on the standpipe 1 from both sides, and fix it with bolts; the outer ring 3 is screwed on the outside of the inner ring 2, and fixed with bolts; separate the short Insert the cuboid pin 12 at the tail end of the disk 6 and the long separation disk 7 into the cuboid socket 11 on the outer ring 3; insert a control rod 8 with a left-hand spiral rib and a control rod 9 with a right-hand spiral rib into the back-facing standpipe respectively 1, insert the other control rod 8 with left-hand spiral ribs and the other control rod 9 with right-hand spiral ribs into the left and right sides of the long separation disc 7 facing away from the standpipe 1 The circular hole 10, and make the outer convex ring 14 contact the limit step 13 in the circular hole 10, two control rods 8 with left-hand spiral ribs and two control rods 9 with right-hand spiral ribs are symmetrical about the center of the standpipe 1 pipe axis; Finally, install the upper rotating assembly, put the inner ring 2 on the riser 1 from both sides, and fix it with bolts. The outer ring 3 is screwed on the outside of the inner ring 2, and fixed with bolts. The rib control rod 8 and two right-hand spiral rib control rods 9 are clamped between the round holes 10 of the upper and lower rotating assembly outer rings 3, and the short separation disc 6 and the long separation disc 7 are clamped between the upper and lower two. Between the cuboid sockets 11 of the outer ring 3 of each rotating assembly.

After the installation is completed, the marine riser 1 is placed in seawater. When the seawater impacts on the riser vibration suppression device that cooperates with active and passive control, due to the difference in force between the short separation disc 6 and the long separation disc 7, a The rotational torque around the tube axis of standpipe 1 makes the short separating disc 6 and long separating disc 7 drive the rotating assembly and two control rods 8 with left-hand spiral ribs and two control rods 9 with right-hand spiral ribs to wind around the tube axis of standpipe 1 together Rotate until the short separation disc 6 and the long separation disc 7 are parallel to the flow direction of the water flow. The left-hand spiral rib 15 with the left-hand spiral rib control lever 8 will drive the left-hand spiral rib control lever 8 to rotate clockwise after being impacted by the water flow, and the right-hand spiral rib 16 with the right-hand spiral rib control lever 9 will drive the right-hand spiral rib 16 after being impacted by the water flow. The spiral rib control rod 9 rotates counterclockwise. The left-hand spiral rib control rod 8 and the right-hand spiral rib control rod 9 on the left and right sides of the short separation disc 6 and the long separation disc 7 facing away from the standpipe 1 rotate around their respective central axes to inject energy into the boundary layer around the standpipe 1, Delaying the separation point of the boundary layer weakens the strength of the vortex shedding and reduces the size of the shedding vortex, thereby realizing energy-free active control of the vibration of the standpipe 1 . The short separation disk 6 and the long separation disk 7 divide the space for the development of the wake vortex, further destroying the development of the wake vortex, thereby realizing the passive control of the vibration of the riser 1 . Under the cooperative action of such active and passive control, the vibration of the riser 1 can be effectively suppressed.

Claims (3)

1. A standpipe vibration suppression device with active and passive control synergy, characterized in that it consists of two symmetrical rotating assemblies, the upper and lower, a short separation disc (6), a long separation disc (7), two left-handed The spiral rib control rod (8) and two right-hand spiral rib control rods (9) are composed; the rotating assembly is composed of an inner ring (2) and an outer ring (3); the inner ring (2) is composed of two symmetrical The inner ring (2) has a T-shaped chute (5) processed on the outer surface; the outer ring (3) is also composed of two symmetrical half-ring steel members, and each half-ring member has a Cuboid jack (11), and on half ring, offer two round holes (10) symmetrical about cuboid jack (11), be provided with limit step (13) in round hole (10), two round holes (10) ) The angle between the center of the circle and the center of the outer ring (3) is 90°; the inner surface of the semi-ring member between the two circular holes (10) is processed with a T-shaped buckle (4) with an arc length angle of 90°; The outer ring (3) is set on the outer side of the inner ring (2), and the T-shaped buckle (4) is screwed into the T-shaped chute (5) of the inner ring (2); the short separation disc (6) and the long separation disc ( Both ends of 7) are processed with rectangular parallelepiped pins (12), insert the rectangular parallelepiped pins (12) into the rectangular parallelepiped sockets (11) on the outer ring (3) to realize the fixing of the short separation disc (6) and the long separation disc (7) The left-hand spiral rib (15) is processed on the control lever (8) with left-hand spiral rib, and the right-hand spiral rib (16) is processed on the control lever (9) with right-hand spiral rib; the control lever (8) with left-hand spiral rib and belt Both ends of the right-hand spiral rib control rod (9) are processed with convex rings (14), and a control rod with a left-hand spiral rib (8) and a control rod with a right-hand spiral rib (9) are respectively inserted into the vertical The short separation disk (6) of the tube (1) has circular holes (10) on the left and right sides, and the other control rod (8) with the left-hand spiral rib and the other control rod (9) with the right-hand spiral rib are respectively inserted into the back vertical The long separation disk (7) of the tube (1) has round holes (10) on the left and right sides, and makes the outer convex ring (14) contact the limit step (13) in the round hole (10); two left-handed spiral ribs The control rod (8) and two control rods (9) with right-hand spiral ribs are clamped between the circular holes (10) of the upper and lower rotating assembly outer rings (3), and the convex ring (14) is connected to the limit The line contact of the bit step (13) can make the control lever (8) with the left-hand spiral rib and the control lever (9) with the right-hand spiral rib rotate around its central axis. 2. A standpipe vibration suppressing device with active and passive control synergy as claimed in claim 1, characterized in that: a spiral outer control rod (8) with a left-hand spiral rib (8) and a control rod (9) with a right-hand spiral rib The diameter d is 0.05 to 0.2 times the outer diameter D of the standpipe (1); the length H of the control rod with left-hand spiral ribs (8) and the control rod with right-hand spiral ribs (9) is 5D to 8D; the control rod with left-hand spiral ribs (8) and the gap G1 between the control rod with right-hand spiral ribs (9) and the standpipe ( ₁ ) is 0.1D ~ 0.6D, the short separation disc (6) and the long separation disc (7) and the standpipe (1) ) between the gap G ₂ is 0.1D ~ 0.6D. 3. The riser vibration suppression method of active and passive control synergy provided by a kind of active and passive control synergistic riser vibration suppression device as claimed in claim 1, it is characterized in that: seawater impact is in active and passive control synergy When the active standpipe vibration suppression device is on, due to the difference in force between the short separation disc (6) and the long separation disc (7), a rotational moment around the tube axis of the standpipe (1) will be generated, so that the short separation disc (6) ) and the long separation disc (7) drive the rotating assembly and two control rods with left-hand spiral ribs (8) and two control rods with right-hand spiral ribs (9) to rotate around the pipe axis of the standpipe (1) until the short separation disc (6) and the long separation disc (7) are parallel to the flow direction of the water flow; the left-hand spiral rib (15) with the left-hand spiral rib control rod (8) will drive the left-hand spiral rib control rod (8) to rotate clockwise after being impacted by the water flow , the right-hand spiral rib (16) with the right-hand spiral rib control rod (9) will drive the right-hand spiral rib control rod (9) to rotate counterclockwise after being impacted by the water flow; the short separation disc (6) facing away from the standpipe (1) ) and the long separating disc (7) with left-hand spiral rib control rod (8) and right-hand spiral rib control rod (9) rotate around their respective central axes on the left and right sides, inject energy into the boundary layer around the riser (1), and extend The separation point of the rear boundary layer weakens the strength of the vortex shedding and reduces the size of the shedding vortex, thereby realizing energy-free active control of the vibration of the standpipe (1); the short separation disc (6) and the long separation disc (7) are separated The space for the development of the wake vortex is opened, and the development of the wake vortex is further destroyed, thereby realizing the passive control of the vibration of the standpipe (1); under the synergy of such active and passive control, the vibration of the standpipe (1) can be effectively suppressed .