Testing device for vortex-induced vibration interference phenomenon of deepwater vertical tube bundle

Abstract

The invention discloses a testing device for a vortex-induced vibration interference phenomenon of a deepwater vertical tube bundle. The first rail and the second rail are in sliding connection with the support and can be locked; the clamping mechanisms comprise the first clamping mechanism and the second clamping mechanism, the first clamping mechanism is connected with the first track in a sliding mode and can be locked, the second clamping mechanism is connected with the second track in a sliding mode and can be locked, and the first clamping mechanism and the second clamping mechanism are symmetrically arranged; each of the first clamping mechanism and the second clamping mechanism comprises a frame, a clamp for clamping the vertical pipe and a spring, the spring is movably connected with the frame and can be locked, the spring is fixedly connected with the clamp, and the other end of the spring is movably connected with the frame and can be locked; the device has the beneficial effects that the continuous adjustment of the distance between the stand pipes in series and in parallel can be realized, and the continuous adjustment of the distance between the stand pipes in step arrangement and the incident flow angle can be realized; single or two-degree-of-freedom vibration of the two model stand pipes can be controlled respectively.

Description

Technical Field

[0001] The invention belongs to the technical field of riser detection, and in particular relates to a test device for vortex-induced vibration interference phenomenon of a deepwater riser bundle. Background Art

[0002] Riser is an important equipment for deepwater offshore oil and gas development. The main tree production risers equipped on production platforms are usually arranged in groups, forming a series, ladder and parallel arrangement, which are usually called series, ladder risers or parallel risers in the industry. Series risers refer to the flow velocity direction parallel to the plane formed by two or more risers, ladder risers refer to the flow velocity and the plane formed by two or more risers at an angle of less than 90 degrees, and parallel risers refer to the flow velocity direction perpendicular to the plane formed by two or more risers.

[0003] When the ocean current flows through these riser bundles, the riser that the ocean current flows through first is called the upstream riser, and the risers located at the wake of the upstream riser are called downstream risers; the parallel risers are called left and right risers respectively according to the direction of the ocean current. Studies have shown that when vortex-induced vibration occurs, interference will occur between adjacent risers, and the strength of the interference depends on the distance between the two risers and their motion state. Due to the space limitations of deep-water floating platforms, it is impossible to design the distance between multiple risers in a riser bundle to a scale where interference does not occur. Therefore, in order to avoid strong interference between multiple risers in a riser bundle, designers need to reasonably design the riser bundle, that is, to consider both the space limitations on the platform and to avoid strong interference between risers.

[0004] The current model tests of tandem risers, stepped risers and parallel risers have the following three disadvantages:

[0005] 1) Only single diameter model tubes can be tested. Therefore, model tubes made of different materials must be used to change the elastic properties of the model tubes to change the vibration parameters of the model tubes.

[0006] 2) Both model risers cannot achieve single-degree-of-freedom vibration control, that is, it is impossible to achieve the model riser generating only one-degree-of-freedom vibration. Therefore, it is impossible to study the impact of single-degree-of-freedom vibration on the wake and vibration of the other riser.

[0007] 3) The relative position of the two model tubes cannot be adjusted continuously, and the distance between the two model tubes can only be adjusted according to the position set on the test device. Therefore, the turning point of the wake change cannot be accurately captured.

[0008] The riser bundle on a deepwater oil production platform usually consists of more than 6 risers, which are usually arranged parallel to the two main axes of the platform plane. Due to the limitation of platform space, the spacing between the risers is the same in both directions, and the minimum spacing is based on the principle of not causing interference that is sufficient to affect the safety of the structure. Since the direction of the ocean current changes, the position of the risers relative to the flow field will change, thus forming tandem, parallel and stepped risers.

[0009] When vortex-induced vibration occurs, the vortex street discharged from the upstream riser will have a great impact on the flow field of the downstream riser, so as to change the vortex discharge frequency and vortex shape of the downstream riser, thereby changing the vortex-induced vibration frequency and amplitude of the downstream riser. At the same time, the existence of the downstream riser will also affect the vortex discharge of the upstream riser, thereby changing the vortex-induced vibration properties of the upstream riser. For parallel risers, the flow fields around the two risers will also produce mutual interference and affect their respective vortex discharges, thereby affecting their vortex-induced vibrations. Studies have shown that within a certain spacing range of tandem risers, the vortex-induced vibration frequency of the downstream riser is lower than that of the upstream riser, while the amplitude is much larger than that of the upstream riser. However, there has been no research conclusion or even research report on the influence of the existence and movement of the upstream / downstream risers on the locking range and locking frequency ratio of the downstream / upstream risers. For parallel risers, current research has only revealed that their vortex-induced vibration will produce a 180-degree phase difference, and other issues have not been reported. For the influencing factors between the stepped risers, there are few research reports due to the limitations of experimental conditions.

[0010] At present, the test equipment for series, parallel and stepped risers is usually composed of two separate gantry brackets. Two or more circular holes are set on the crossbeam of each bracket. The diameter of the circular hole is the same as the diameter of the model pipe used for the test. The distance between the two circular holes is determined according to the offset distance of the parallel risers or stepped risers designed in the test, and the distance between the two brackets is determined according to the spacing of the series risers or the flow angle of the stepped risers.

[0011] When testing the tandem and stepped risers, the installation spacing of the two brackets needs to be constantly adjusted. This is done by moving one of the two brackets to change the spacing of the tandem risers or the flow angle of the stepped risers. The flow angle of the stepped risers and the distance between the two risers cannot be adjusted separately, and can only meet the flow angle or distance. When testing the parallel risers, the adjustment spacing can only be determined when the brackets are made, and cannot be changed at any time during the test.

[0012] In addition, some unexpected phenomena may be discovered during the test, which may require modifying the test parameters and increasing the number of test groups to determine the cause of the new phenomenon or the data that produces the new phenomenon. However, the existing technology does not have this function, and the only option is to redesign and manufacture the bracket for testing.

[0013] In order to solve the existing problems, we propose a test device for the vortex-induced vibration interference phenomenon of deepwater riser bundles. Summary of the invention

[0014] The object of the present invention is to provide a test device for the vortex-induced vibration interference phenomenon of a deepwater riser bundle, so as to solve the problems raised in the above-mentioned background technology.

[0015] To achieve the above object, the present invention provides the following technical solutions:

[0016] A test device for vortex-induced vibration interference phenomenon of deepwater riser bundle, comprising:

[0017] Bracket;

[0018] A first track and a second track, wherein the first track and the second track are slidably connected to the bracket and can be locked, and the second track is arranged below the first track;

[0019] The clamping mechanism comprises a first clamping mechanism and a second clamping mechanism, wherein the first clamping mechanism is slidably connected to the first track and can be locked, and the second clamping mechanism is slidably connected to the second track and can be locked, and the first clamping mechanism and the second clamping mechanism are symmetrically arranged;

[0020] The first clamping mechanism and the second clamping mechanism both include a frame, a clamp for clamping the riser, and a spring. The spring is movably connected to the frame and can be locked. One end of the spring is fixedly connected to the clamp, and the other end is movably connected to the frame and can be locked.

[0021] The motion trajectories of the first track and the second track are both perpendicular to the motion trajectories of the first clamping mechanism and the second clamping mechanism;

[0022] During the test, one end of the riser is fixedly connected to the clamp of the first clamping mechanism, and the other end is fixedly connected to the clamp of the symmetrical second clamping mechanism.

[0023] Preferably, the bracket is a hexahedron formed by 12 rods fixedly connected in pairs.

[0024] Preferably, the upper surfaces of the two rods at the top of the bracket and the two rods at the bottom of the bracket are provided with a first groove body, and the first track and the second track both include a first bolt body, the first bolt body passes through and is threadedly connected to the corresponding first track and the second track, and the first bolt body is fixedly connected to the first slider at one end close to the first groove body, and the first groove body and the first slider cooperate.

[0025] Preferably, the first groove bodies are all dovetail grooves, and the first sliders are all dovetail sliders.

[0026] Preferably, the first rail and the second rail are both rectangular plates with channels, and the upper surfaces of the first rail and the second rail are provided with second grooves. The first clamping mechanism and the second clamping mechanism both include a second bolt body, which passes through and is threadedly connected to the frame. The second bolt body is fixedly connected to a second slider at one end close to the second groove body, and the second groove body and the second slider cooperate with each other.

[0027] Preferably, the second groove body is a dovetail groove, and the second slider is a dovetail slider.

[0028] Preferably, the number of springs in the first clamping mechanism and the second clamping mechanism are both 4;

[0029] The frame is a quadrilateral, and the inner wall is provided with a third slot body, one end of the spring away from the clamp is fixedly connected with a third slide block, and the third slot body and the third slide block are matched and slidably connected.

[0030] Preferably, the third groove body is a dovetail groove, and the third slider is a dovetail slider.

[0031] Preferably, there are two first tracks arranged side by side, and there are two second tracks arranged side by side.

[0032] Preferably, the clamp is a block provided with a through hole, and the clamping mechanism further comprises a bolt for fixing the standpipe, the bolt passes through and is threadedly connected to the clamp, and the bolt presses against the standpipe during the test.

[0033] Preferably, the first clamping mechanism and the second clamping mechanism are both provided with a plurality of bolts, the bolts penetrate through and are threadedly connected to the frame, and the bolts are contactably connected to the third sliding block.

[0034] The first track of the present invention is located at the top and the second track is located at the bottom, providing vertical support for the riser.

[0035] In the present invention, the spring is fixedly connected to the third slider, the third slider and the third slot body cooperate and are slidably connected, the first track can slide and be locked on the bracket, the second track can slide and be locked on the bracket, the first clamping mechanism is slidably connected and lockable to the first track, the second clamping mechanism is slidably connected and lockable to the second track, and one end of the spring in the clamping mechanism is slidably connected and lockable to the frame. The above invention design ensures the realization of the test conditions in the experiment and simulates the actual situation of the riser in use.

[0036] Compared with the prior art, the beneficial effects of the present invention are: the present invention can realize continuous adjustment of the spacing between series and parallel risers, can realize continuous adjustment of the spacing and flow angle of stepped risers; and can control the single or two-degree-of-freedom vibration of the two model risers respectively. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0038] Figure 2 It is a three-dimensional structural schematic diagram of the clamping mechanism of the present invention;

[0039] Figure 3 is a schematic diagram of the cross-sectional structure of the clamping mechanism;

[0040] In the figure: 1- bracket; 100- first slot body; 201- first bolt body; 202- second slot body; 21- first track; 22- second track; 301- frame; 302- clamp; 303- spring; 304- second bolt body; 305- second slider; 31- first clamping mechanism; 311- third slot body; 32- second clamping mechanism; 321- third slider; 4- bolt. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] See also Figures 1 to 3 , the present invention provides several technical solutions:

[0043] Embodiment 1:

[0044] A test device for vortex-induced vibration interference phenomenon of deepwater riser bundle, comprising:

[0045] The bracket 1 is a hexahedron formed by 12 rods fixedly connected in pairs, and the upper surfaces of the two rods at the top of the bracket 1 and the two rods at the bottom of the bracket 1 are both provided with a first groove 100.

[0046] The first rail 21 and the second rail 22 are slidably connected to the bracket 1 and can be locked. The second rail 22 is arranged below the first rail 21; the movement trajectories of the first rail 21 and the second rail 22 are perpendicular to the movement trajectories of the first clamping mechanism 31 and the second clamping mechanism 32; there are two first rails 21 and they are arranged side by side, and there are two second rails 22 and they are arranged side by side. The lower surfaces of both ends of the first rail 21 and the second rail 22 are provided with first sliders, and the first slot body 100 cooperates with the first slider. The first rail 21 and the second rail 22 both include a first bolt body 201, which penetrates and is threadedly connected to the first rail 21 and the second rail 22. The first bolt body 201 is fixedly connected to the first slider at one end close to the first slot body 100, and the first slider cooperates with the first slot body 100. The first slot body 100 is a dovetail groove, and the first sliders are dovetail sliders. The first track 21 and the second track 22 are both rectangular plates with channels, and the upper surfaces of the first track 21 and the second track 22 are provided with second slots 202. The first clamping mechanism 31 and the second clamping mechanism 32 both include a second bolt 304, which penetrates and is threadedly connected to the frame 301. The second bolt 304 is fixedly connected to a second slider 305 at one end close to the second slot 202, and the second slot 202 and the second slider 305 cooperate. The second slot 202 is a dovetail slot, and the second slider 305 is a dovetail slider.

[0047] The first track 21 and the second track 22 are both rectangular plates with channels. The upper surfaces of the first track 21 and the second track 22 are provided with a second slot 202. The clamping mechanism includes a first clamping mechanism 31 and a second clamping mechanism 32. The first clamping mechanism 31 is slidably connected to the first track 21 and can be locked. The second clamping mechanism 32 is slidably connected to the second track 22 and can be locked. The first clamping mechanism 31 and the second clamping mechanism 32 are symmetrically arranged. The first clamping mechanism 31 and the second clamping mechanism 32 both include a frame 301, a clamp 302 for clamping a vertical pipe, and a spring 303. The spring 303 is movably connected to the frame 301 and can be locked. One end of the spring 303 is fixedly connected to the clamp 302, and the other end is movably connected to the frame 301 and can be locked. The frame 301 is a quadrilateral, and the inner wall is provided with a third slot 311. The end of the spring 303 away from the clamp 302 is fixedly connected to a third slider 321. The third slot 311 and the third slider 321 cooperate and are slidably connected. The third slot body 311 is a dovetail slot, and the third slider 321 is a dovetail slider. The number of springs 303 in the first clamping mechanism 31 and the second clamping mechanism 32 are both 4; the clamp 302 is a block with a through hole, and the clamping mechanism also includes a bolt 4 for fixing the standpipe, the bolt 4 passes through and is threadedly connected to the clamp 302. During the test, the bolt 4 is against the standpipe, one end of the standpipe is fixedly connected to the clamp 302 of the first clamping mechanism 31, and the other end is fixedly connected to the clamp 302 of the symmetrical second clamping mechanism 32.

[0048] Embodiment 2:

[0049] On the basis of Embodiment 1, the first clamping mechanism 31 and the second clamping mechanism 32 are both provided with a plurality of bolts 4 , and the bolts 4 are both passed through the frame 301 and are contactably connected with the third sliding block 321 .

[0050] The working principle and use process of the present invention:

[0051] During the experiment, the first clamping mechanism 31 of the first track 21 and the second clamping mechanism 32 of the second track 22 are adjusted according to the arrangement of the series and parallel risers. After the adjustment is completed, the riser is inserted into the channel of the clamp 302, and the bolt 4 on the clamp 302 is tightened to resist the riser, and then the first bolt body 201 and the second bolt body 304 are tightened to lock the positions of the adjusted clamping mechanism, the first track 21, and the second track 22, and the equipment is turned on for testing. During the test, due to the effect of water flow, the unlocked third slider 321 will slide in the third slot 311 to ensure that the riser makes corresponding movements under the action of vortex excitation force. If it is necessary to test the influence of one or two degrees of freedom of the movement of the upstream or downstream riser of the series and ladder risers on its downstream or upstream riser, and the influence of one or two degrees of freedom of the movement of the parallel riser on its adjacent riser, it can be achieved by tightening the corresponding bolts 4 of the frame 301.

[0052] Although embodiments of the present invention have been shown and described (see the above detailed description for details), it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

[0053] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0054] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

Claims

1. A test device for the vortex-induced vibration interference phenomenon of deepwater riser bundles, Features: include Bracket (1); A first track (21) and a second track (22), wherein the first track (21) and the second track (22) are slidably connected to the bracket (1) and can be locked, and the second track (22) is arranged below the first track (21); The clamping mechanism comprises a first clamping mechanism (31) and a second clamping mechanism (32), wherein the first clamping mechanism (31) is slidably connected to the first track (21) and can be locked, and the second clamping mechanism (32) is slidably connected to the second track (22) and can be locked, and the first clamping mechanism (31) and the second clamping mechanism (32) are symmetrically arranged; The first clamping mechanism (31) and the second clamping mechanism (32) both comprise a frame (301), a clamp (302) for clamping a vertical pipe, and a spring (303); the spring (303) is movably connected to the frame (301) and can be locked; one end of the spring (303) is fixedly connected to the clamp (302), and the other end is movably connected to the frame (301) and can be locked; The movement trajectories of the first track (21) and the second track (22) are both perpendicular to the movement trajectories of the first clamping mechanism (31) and the second clamping mechanism (32); During the test, one end of the riser is fixedly connected to the clamp (302) of the first clamping mechanism (31), and the other end is fixedly connected to the clamp (302) of the symmetrical second clamping mechanism (32).

2. The test device for the vortex-induced vibration interference phenomenon of a deepwater riser bundle according to claim 1, Features: The bracket (1) is a hexahedron formed by 12 rods fixedly connected in pairs.

3. The test device for the vortex-induced vibration interference phenomenon of a deepwater riser bundle according to claim 2, Features: The upper surfaces of the two rods at the top of the bracket (1) and the two rods at the bottom of the bracket (1) are both provided with a first groove body (100); the first track (21) and the second track (22) both comprise a first bolt body (201); the first bolt body (201) penetrates through and is threadedly connected to the corresponding first track (21) and second track (22); one end of the first bolt body (201) close to the first groove body (100) is fixedly connected to a first slider; the first slider cooperates with the first groove body (100).

4. The test device for the vortex-induced vibration interference phenomenon of a deepwater riser bundle according to claim 3, It is characterized in that The first slot bodies (100) are all dovetail slots, and the first sliding blocks are all dovetail sliding blocks.

5. The test device for the vortex-induced vibration interference phenomenon of a deepwater riser bundle according to claim 1, Features: The first track (21) and the second track (22) are both rectangular plates provided with channels, the upper surfaces of the first track (21) and the second track (22) are provided with second grooves (202), the first clamping mechanism (31) and the second clamping mechanism (32) both comprise a second bolt (304), the second bolt (304) passes through and is threadedly connected to the frame (301), one end of the second bolt (304) close to the second groove (202) is fixedly connected to a second slider (305), and the second groove (202) and the second slider (305) cooperate.

6. The test device for the vortex-induced vibration interference phenomenon of a deepwater riser bundle according to claim 5, Features: The second groove body (202) is a dovetail groove, and the second slider (305) is a dovetail slider.

7. The test device for the vortex-induced vibration interference phenomenon of a deepwater riser bundle according to claim 1, Features: The number of the springs (303) in the first clamping mechanism (31) and the number of the second clamping mechanism (32) are both 4; The frame (301) is a quadrilateral, and the four inner walls are each provided with a third groove body (311). One end of the spring (303) away from the clamp (302) is fixedly connected to a third slider (321), and the third groove body (311) and the third slider (321) are matched and slidably connected.

8. The test device for the vortex-induced vibration interference phenomenon of a deepwater riser bundle according to claim 7, Features: The third groove body (311) is a dovetail groove, and the third slider (321) is a dovetail slider.

9. The test device for vortex-induced vibration interference phenomenon of deepwater riser bundle according to claim 1, Features: There are two first rails (21) arranged side by side, and there are two second rails (22) arranged side by side.

10. The test device for vortex-induced vibration interference phenomenon of deepwater riser bundle according to claim 1, Features: The clamp (302) is a block with a through hole. The clamping mechanism also includes a bolt (4) for fixing the vertical pipe. The bolt (4) passes through and is threadedly connected to the clamp (302). During the test, the bolt presses against the vertical pipe.

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