Vortex-induced vibration suppression device, marine riser system and oil extraction system

Abstract

The invention provides a vortex-induced vibration suppression device, a marine riser system and an oil extraction system. The vortex-induced vibration suppression device comprises a flow guide body and two thrust devices. The flow guide body is of a streamline structure and used for being arranged on the outer side of the marine riser in a sleeving mode, and the flow guide body is in clearance fit with the marine riser. The thrust devices are used for tightly holding the outer side of the marine riser and are arranged at the two ends of the flow guide body correspondingly so as to limit the flow guide body to move in the axial direction of the marine riser. The thrust devices are in sliding contact with the end part of the flow guide body or the distance between the two thrust devices is greater than the axial length of the flow guide body. According to the vortex-induced vibration suppression device provided by the invention, the flow guide body can freely rotate around the marine riser so as to adapt to a marine environment in which the flow direction frequently changes, so that the front-back direction of the flow guide body is always parallel to the flow direction of ocean current. The flow guide body is connected with the marine riser without a bearing, so that the weight and installation and application difficulty of the device are greatly reduced. The thrust device is used for limiting the axial movement of the flow guide body, and installation is easy and convenient.

Description

Technical Field

[0001] The present invention relates to the field of marine engineering technology, and in particular to a vortex-induced vibration suppression device, a marine riser system and an oil production system. Background Art

[0002] Marine risers are extremely slender. Under the action of ocean currents, periodic alternating vortices will appear on both sides of the risers. These periodic vortices will then induce periodic hydrodynamic loads around the risers. When the frequency of the hydrodynamic load is close to a certain order of natural frequency of the riser, the riser will vibrate significantly perpendicular to and along the flow direction. This phenomenon is called vortex-induced vibration. Vortex-induced vibration is one of the important causes of riser fatigue damage, greatly shortening the service life of the riser.

[0003] In order to weaken and suppress the vortex-induced vibration of the riser, the engineering community has covered the surface of the riser with different forms of suppression devices, which can be mainly divided into two categories: active suppression devices and passive suppression devices. Active suppression devices require external energy input, which is costly and impractical in actual marine engineering. In contrast, passive suppression devices do not require external energy, are easy to manufacture and install, and have been widely used in marine engineering.

[0004] The guide plate is a common passive suppression device. In the actual marine environment, the flow direction is complex and changeable. Rotatable guide plates are usually used. The tail can be deflected to the flow direction under the impact of the incoming flow, which has a good vortex-induced vibration suppression effect. Existing rotatable guide plates usually rely on bearings to provide rotational freedom. However, the bearings suitable for real marine risers are heavy and difficult to install. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a vortex-induced vibration suppression device, a marine riser system and an oil production system, which aim to solve the problem in the related art that the rotatable guide plate is rotatably connected to the marine riser through a bearing, and the bearing is heavy and difficult to install.

[0006] The present invention provides a vortex-induced vibration suppression device, a marine riser system and an oil production system, comprising:

[0007] A body guide, wherein the body guide is a streamlined structure, and is used to be sleeved on the outer side of the marine riser, and the body guide is clearance-matched with the marine riser;

[0008] Two thrust devices, the thrust devices are used to hold the outer side of the marine riser tightly, and the two thrust devices are respectively arranged at two ends of the guide body, the thrust devices are in sliding contact with the ends of the guide body, or the distance between the two thrust devices is greater than the axial length of the guide body.

[0009] According to the vortex-induced vibration suppression device provided by the present invention, the guide body comprises:

[0010] A fairing, wherein the outer side of the fairing is streamlined, and a mounting hole is provided near the front side of the fairing, and the mounting hole is in clearance with the marine riser;

[0011] The tail plate is formed by extending rearward from the tail end of the fairing.

[0012] According to the vortex-induced vibration suppression device provided by the present invention, the deflector includes:

[0013] Install the barrel;

[0014] A conical connector, the large end of which is connected to the outer side surface of the mounting tube, and the outer side surface of the conical connector is smoothly connected to the outer side surface of the mounting tube, and the tail plate is connected to the small end of the conical connector.

[0015] According to the vortex-induced vibration suppression device provided by the present invention, the conical connector is a closed structure with a hollow interior.

[0016] According to the vortex-induced vibration suppression device provided by the present invention, the interior of the conical connector is hollow, and the hollow portion of the conical connector is connected to the outside, and a low-density buoyancy material is arranged in the hollow of the conical connector.

[0017] According to the vortex-induced vibration suppression device provided by the present invention, the thrust device includes a circular ring formed by connecting two half rings, the inner diameter of the circular ring is equal to the outer diameter of the marine riser, the outer diameter of the circular ring is larger than the maximum distance between the inner side wall of the mounting hole and the axis of the circular ring, and the central angle of the half ring constituting the thrust device is less than 180 degrees.

[0018] According to the vortex-induced vibration suppression device provided by the present invention, the outer diameter of the mounting tube is D, and the length of the tail plate in the front-to-back direction is L t is 0.2D.

[0019] According to the vortex-induced vibration suppression device provided by the present invention, the distance L between the tail end of the tail plate and the front end of the deflector is c It is 1.33D.

[0020] The present invention also provides a marine riser system, comprising a marine riser and at least one vortex-induced vibration suppression device as described above, wherein a plurality of the vortex-induced vibration suppression devices are sequentially sleeved on the marine riser along the axial direction of the marine riser.

[0021] The present invention also provides an oil production system, comprising the vortex-induced vibration suppression device as described above or the marine riser system as described above.

[0022] The present invention adopts the above technical solution, which has the following advantages:

[0023] The vortex-induced vibration suppression device provided by the present invention comprises a guide body and two thrust devices. The guide body is a streamlined structure, which is used to be sleeved on the outside of the marine riser, and the guide body and the marine riser are matched with each other in a clearance. In this way, the guide body can rotate relative to the marine riser around the axis of the marine riser, and the streamlined structure can effectively suppress the generation of vortex-induced vibration. The thrust device is used to hold the outside of the marine riser tightly, and the two thrust devices are respectively arranged at both ends of the guide body, so that the thrust device can limit the axial movement of the guide body along the marine riser. The thrust device and the end of the guide body are in sliding contact or the distance between the two thrust devices is greater than the axial length of the guide body. Both methods can prevent the thrust device from limiting the rotation of the guide body around the axis. In the vortex-induced vibration suppression device provided by the present invention, the guide body can rotate freely around the marine riser to adapt to the marine environment with frequent changes in flow direction, so that the front and rear directions of the guide body are always parallel to the flow direction of the ocean current. The connection between the guide body and the marine riser does not require a bearing, which greatly reduces the weight of the device and the difficulty of installation and application. The thrust device is used to limit the axial movement of the guide body, and its installation is simple and convenient.

[0024] Furthermore, in the marine riser system and the oil production system provided by the present invention, since both are provided with the vortex-induced vibration suppression device as described above, they have the same advantages as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a front view of the connection between the vortex-induced vibration suppression device provided by one embodiment of the present invention and the marine riser;

[0027] Figure 2 is a top view of a vortex-induced vibration suppression device provided by an embodiment of the present invention;

[0028] Figure 3 is a schematic structural diagram of a thrust device provided by an embodiment of the present invention;

[0029] Figure 4 It is a schematic diagram of the assembly process of a vortex-induced vibration suppression device provided in one embodiment of the present invention.

[0030] Reference numerals:

[0031] 100: marine riser; 210: mounting tube; 220: conical connector; 230: tail plate; 300: half ring. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are 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 creative work are within the scope of protection of the present invention.

[0033] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0035] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0037] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0038] The vortex-induced vibration suppression device provided by the present invention comprises a guide body and two thrust devices. The guide body is a streamlined structure, which is used to be sleeved on the outside of the marine riser, and the guide body and the marine riser are matched with each other in a clearance. In this way, the guide body can rotate relative to the marine riser around the axis of the marine riser, and the streamlined structure can effectively suppress the generation of vortex-induced vibration. The thrust device is used to hold the outside of the marine riser tightly, and the two thrust devices are respectively arranged at both ends of the guide body, so that the thrust device can limit the axial movement of the guide body along the marine riser. The thrust device and the end of the guide body are in sliding contact or the distance between the two thrust devices is greater than the axial length of the guide body. Both methods can prevent the thrust device from limiting the rotation of the guide body around the axis. In the vortex-induced vibration suppression device provided by the present invention, the guide body can rotate freely around the marine riser to adapt to the marine environment with frequent changes in flow direction, so that the front and rear directions of the guide body are always parallel to the flow direction of the ocean current. The connection between the guide body and the marine riser does not require a bearing, which greatly reduces the weight of the device and the difficulty of installation and application. The thrust device is used to limit the axial movement of the guide body, and its installation is simple and convenient.

[0039] Combine the following Figures 1 to 4 The vortex-induced vibration suppression device of the present invention is described.

[0040] An embodiment of the present invention provides a vortex-induced vibration suppression device, comprising a guide body and two thrust devices.

[0041] The diverter is a streamlined structure, which is used to be sleeved on the outside of the marine riser 100, so that seawater can flow smoothly through the diverter to suppress the generation of vortex-induced vibration. The diverter and the marine riser 100 are matched with each other in a clearance, so that the diverter can rotate around the axis of the marine riser 100 relative to the marine riser 100. The flow direction of the ocean current is complex and changeable. When the flow direction of the ocean current changes, the ocean current will drive the diverter to adaptively rotate to an angle parallel to the flow direction of the ocean current, and the head end of the diverter faces the direction of the ocean current.

[0042] The thrust stoppers include two thrust stoppers, which are used to hold the outer side of the marine riser 100 tightly, that is, after the thrust stoppers are installed on the outer side of the marine riser 100, at least the axial position of the thrust stoppers remains fixed. The two thrust stoppers are respectively arranged at both ends of the guide body to limit the axial movement of the guide body. Since the guide body needs to rotate around the axis, the thrust stoppers need to be in sliding contact with the ends of the guide body to prevent the friction between the guide body and the thrust stoppers from being too large and thus limiting the rotation of the guide body. Alternatively, the distance between the two thrust stoppers is slightly larger than the axial length of the guide body, so that there is a gap between the guide body and the thrust stoppers to prevent the thrust stoppers from limiting the rotation of the guide body.

[0043] In the vortex-induced vibration suppression device provided by the present invention, the guide body and the marine riser 100 are clearance-matched, so that the guide body can rotate freely around the marine riser 100 to adapt to the marine environment where the flow direction changes frequently, so that the front and rear direction of the guide body is always parallel to the flow direction of the ocean current. The connection between the guide body and the marine riser 100 does not require a bearing, which greatly reduces the weight of the device and the difficulty of installation and application. The thrust device is used to limit the axial movement of the guide body, and the installation is simple and convenient.

[0044] In some embodiments, the guide body includes a guide cover and a tail plate 230 .

[0045] The top and bottom of the shroud can be both planes, and the side of the shroud can be streamlined to reduce the resistance of seawater flowing through, thereby suppressing the generation of vortex-induced vibration. A mounting hole is provided near the front of the shroud, and the mounting hole passes through the top and bottom of the shroud. The inner diameter of the mounting hole is slightly larger than the outer diameter of the marine riser 100 to achieve clearance fit between the shroud and the marine riser 100, so that the shroud can rotate around the marine riser 100.

[0046] The tail plate 230 is formed by extending backward from the tail end of the fairing. When the direction of the ocean current changes, the seawater forms a pressure difference on both sides of the tail plate 230, thereby driving the fairing to rotate around the marine riser 100 until it rotates to a position where the front and rear directions of the fairing are parallel to the ocean current. At this time, the pressure on both sides of the tail plate 230 is equal.

[0047] In some embodiments, the air duct includes a mounting cylinder 210 and a tapered connecting body 220 .

[0048] The interior of the installation tube 210 is the above-mentioned installation hole, which is used to be sleeved on the outer side of the marine riser 100. The large end of the conical connector 220 is connected to the outer side of the installation tube 210, and the outer side of the conical connector 220 is smoothly connected to the outer side of the installation tube 210, and the tail plate 230 is connected to the small end of the conical connector 220. In this way, the combination of the installation tube 210 and the conical connector 220 can form a streamlined structure.

[0049] The mounting tube 210 , the conical connector 220 and the tail plate 230 may be an integrally formed structure.

[0050] In some embodiments, the conical connector 220 can be a closed structure with a hollow interior, so that the weight and density of the entire guide body can be reduced. The conical connector 220 can provide a certain buoyancy for the guide body to reduce the squeezing force between the guide body and the thrust device located below, thereby reducing the friction between the two.

[0051] In some embodiments, the interior of the conical connector 220 is hollow, and the hollow part is an open structure, that is, connected to the outside, and a low-density buoyancy material is arranged in the hollow part. After being filled with the low-density buoyancy material, a certain buoyancy can be provided for the guide body to reduce the squeezing force between the guide body and the thrust device located below, thereby reducing the friction between the two.

[0052] For example, after a certain amount of low-density buoyancy material is filled, the guide body can reach a neutral buoyancy state and float in the seawater. At this time, the guide body will not be squeezed by the thrust device, thereby preventing the friction between the two from hindering the rotation of the guide body.

[0053] In some embodiments, the thrust device is of split design and consists of two half rings 300 , which are connected to form a circular ring. The inner diameter of the thrust device is equal to the outer diameter of the marine riser 100 so that it can fit the outer wall of the marine riser 100 .

[0054] Since the guide body is fitted with the marine riser 100 in a clearance, the guide body will move in the radial direction of the marine riser 100. Therefore, the outer diameter of the thrust device is made larger than the maximum distance between the inner side wall of the mounting hole and the axis of the thrust device. In this way, no matter how the guide body moves, the thrust device can cover the mounting hole of the guide body, so as to limit the axial movement of the guide body.

[0055] The central angle of the half ring 300 constituting the thrust device is smaller than 180 degrees. Bolt holes are provided at the ends of the half ring 300. When the two half rings 300 are attached to the marine riser 100, there is a gap between the opposite ends of the two half rings 300. By passing bolts through the opposite bolt holes and tightening them, the end gap of the two half rings 300 can be reduced, thereby making the two half rings 300 tightly embrace the outer side of the marine riser 100.

[0056] In some embodiments, the outer diameter of the mounting tube 210 may be D, and the length of the tail plate 230 in the front-to-back direction may be L. t It can be 0.2D, and the distance L between the tail end of the tail plate 230 and the front end of the air deflector is c It can be 1.33D.

[0057] As an embodiment of the present invention, the specific assembly process of the vortex-induced vibration suppression device is as follows: Figure 4 A schematic diagram of the assembly process of the vortex-induced vibration suppression device is given. First, the guide body is mounted on the marine riser 100 from bottom to top. When the guide body is moved to an appropriate position, a pair of half rings 300 are placed at the upper and lower ends of the guide body, respectively, and then bolts are inserted into the bolt holes of the half rings 300 and nuts are locked, so that the half rings 300 are tightly held on the marine riser 100, completing the assembly of the vortex-induced vibration suppression device.

[0058] The vortex-induced vibration suppression device provided by the present invention can realize the free rotation of the guide body without relying on bearings, and can control the guide body to be in a neutral buoyancy state, further optimizing the performance of the vortex-induced vibration suppression device. In addition, the guide body adopts a streamlined configuration, which can reduce the flow resistance of the marine riser 100 while suppressing the vortex-induced vibration of the marine riser 100.

[0059] An embodiment of the present invention further provides a marine riser system, comprising a marine riser 100 and at least one vortex-induced vibration suppression device as described above, wherein a plurality of vortex-induced vibration suppression devices are sequentially connected in series on the outside of the marine riser 100. Since the vortex-induced vibration suppression device as described above is provided, the system has the same advantages as described above.

[0060] An embodiment of the present invention further provides an oil production system, which has the same advantages as described above because it is provided with the vortex-induced vibration suppression device as described above or the marine riser system as described above.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A vortex-induced vibration suppression device, characterized in that: include: A body guide, the body guide being a streamlined structure, the body guide being used to be sleeved on the outside of the marine riser (100), and the body guide and the marine riser (100) being in clearance fit; Two thrust devices, the thrust devices are used to hold the outer side of the marine riser (100) tightly, and the two thrust devices are respectively arranged at two ends of the guide body, the thrust devices are in sliding contact with the ends of the guide body, or the distance between the two thrust devices is greater than the axial length of the guide body.

2. The vortex-induced vibration suppression device according to claim 1, characterized in that: The flow guide comprises: A fairing, wherein the outer side surface of the fairing is streamlined, and a mounting hole is provided near the front side of the fairing, and the mounting hole is clearance-matched with the marine riser (100); A tail plate (230) is formed by extending rearward from the tail end of the fairing.

3. The vortex-induced vibration suppression device according to claim 2, characterized in that: The deflector comprises: Mounting cylinder (210); A conical connector (220), the large end of which is connected to the outer side surface of the mounting tube (210), and the outer side surface of the conical connector (220) is smoothly connected to the outer side surface of the mounting tube (210), and the tail plate (230) is connected to the small end of the conical connector (220).

4. The vortex-induced vibration suppression device according to claim 3, characterized in that: The conical connector (220) is a closed structure with a hollow interior.

5. The vortex-induced vibration suppression device according to claim 3, characterized in that: The interior of the conical connector (220) is hollow, and the hollow portion of the conical connector (220) is connected to the outside, and a low-density buoyancy material is arranged in the hollow of the conical connector (220).

6. The vortex-induced vibration suppression device according to claim 2, characterized in that: The thrust stop device comprises a circular ring formed by connecting two half rings (300), the inner diameter of the circular ring is equal to the outer diameter of the marine riser (100), the outer diameter of the circular ring is greater than the maximum distance between the inner side wall of the mounting hole and the axis of the circular ring, and the central angle of the half ring (300) constituting the thrust stop device is less than 180 degrees.

7. The vortex-induced vibration suppression device according to claim 3, characterized in that: The outer diameter of the mounting tube (210) is D, and the length of the tail plate (230) in the front-to-back direction is L. t is 0.2D.

8. The vortex-induced vibration suppression device according to claim 7, characterized in that: The distance L between the tail end of the tail plate (230) and the front end of the air deflector is c It is 1.33D.

9. A marine riser system, characterized in that: It comprises a marine riser (100) and at least one vortex-induced vibration suppression device according to any one of claims 1 to 8, wherein a plurality of the vortex-induced vibration suppression devices are sequentially sleeved on the marine riser (100) along the axial direction of the marine riser (100).

10. An oil production system, characterized in that: It comprises the vortex-induced vibration suppression device as described in any one of claims 1 to 8 or the marine riser system as described in claim 9.

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