A test device for vortex-induced vibration interference phenomenon of deepwater riser bundle

Abstract

The application discloses a test device for vortex-induced vibration interference phenomenon of deepwater riser bundle, which comprises a support, a first track and a second track, the first track and the second track are slidably connected with the support and can be locked, a clamping mechanism, the clamping mechanism comprises a first clamping mechanism and a second clamping mechanism, the first clamping mechanism is slidably connected with the first track and can be locked, the second clamping mechanism is slidably connected with the second track and can be locked, and the first clamping mechanism and the second clamping mechanism are symmetrically arranged, the first clamping mechanism and the second clamping mechanism each comprise a frame, a clamp for clamping a riser 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, and the application has the beneficial effects that the application can realize continuous adjustment of the spacing of series and parallel risers, can realize continuous adjustment of the spacing and the flow angle of risers arranged in steps, and can control single or two-degree-of-freedom vibration of two model risers respectively.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of riser detection, and particularly relates to a test device for vortex-induced vibration interference phenomenon of deepwater riser bundle. BACKGROUND

[0002] Riser is an important equipment for offshore oil and gas development. Dry tree production riser of production platform equipment is usually configured in groups to form tandem, ladder and parallel arrangement, which are commonly known as tandem riser, ladder riser or parallel riser in the industry. Tandem riser refers to the flow direction being parallel to the plane formed by two risers or multiple risers, ladder riser refers to the flow direction being at an angle less than 90 degrees to the plane formed by two risers or multiple risers, and parallel riser refers to the flow direction being perpendicular to the plane formed by two risers or multiple risers.

[0003] When the sea current flows through the riser bundle, the riser first flowed through by the sea current is called the upstream riser, and the risers located in the wake of the upstream riser are all called downstream risers. Parallel risers are respectively called left and right side risers according to the direction of the sea 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 deepwater floating platforms, it is impossible to design the distance between multiple risers of a riser bundle to be a scale that does not cause interference. Therefore, in order to avoid strong interference between multiple risers of a riser bundle, the designer needs to reasonably design the riser bundle, that is, to consider both the space limitations of the platform and to avoid strong interference between the risers.

[0004] The current model tests of tandem riser, ladder riser and parallel riser have the following three shortcomings:

[0005] 1) Only single-diameter model pipe tests can be performed, so model pipes made of different materials must be used to change the elastic properties of the model pipes to change the vibration parameters of the model pipes.

[0006] 2) Both model risers cannot achieve single-degree-of-freedom vibration control, that is, the model risers cannot only produce one degree of freedom of vibration, so the influence of single-degree-of-freedom vibration on the wake and vibration of another riser cannot be studied.

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

[0008] The riser bundle on a deep water production platform is usually composed of more than 6 risers, which are usually arranged parallel to the two main axes of the platform plane. Due to the limitation of the platform space, the distance between the risers is the same in two directions, and the minimum distance is determined by the criterion that no interference is generated which can affect the structural safety. Since the direction of the sea current is variable, the position of the risers relative to the flow field will change, thus forming tandem, parallel and stepped arrangement of risers.

[0009] When vortex-induced vibration occurs, the vortex shedding from the upstream riser will have a great influence on the flow field of the downstream riser, so as to change the vortex shedding frequency and the shape of the vortex of the downstream riser, thus 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 shedding of the upstream riser, thus changing the vortex-induced vibration properties of the upstream riser. For parallel risers, the flow fields around the two risers will also have mutual interference effects to affect their respective vortex shedding, thus affecting their vortex-induced vibration. Studies have shown that within a certain distance range of the tandem risers, the vortex-induced vibration frequency of the downstream riser is lower than that of the upstream riser, and the amplitude is much greater than that of the upstream riser, but the influence of the existence and movement of the upstream / downstream riser on the lock-in range and lock-in frequency ratio of the downstream / upstream riser has not yet reached a research conclusion, even without research reports. For parallel risers, the current research only reveals that their vortex-induced vibration will produce a phase difference of 180 degrees, and other problems have not been reported. For the influence factors between the stepped arrangement risers, there are also few research reports due to the limitation of test conditions.

[0010] Currently, the test device of the tandem, parallel and stepped arrangement risers is usually composed of two separate portal supports, two or more circular holes are arranged on the crossbeam of each support, 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 misalignment distance of the parallel risers or the stepped arrangement risers designed for the test, and the distance between the two supports is determined according to the distance between the tandem risers or the flow angle of the stepped arrangement risers.

[0011] When the tandem and stepped arrangement riser tests are carried out, the installation distance of the two supports needs to be adjusted constantly, which is achieved by moving one of the two supports to change the distance between the tandem risers or the flow angle of the stepped arrangement risers, and the flow angle and the distance between the two risers of the stepped arrangement risers cannot be adjusted separately, but only the flow angle or the distance can be satisfied. When the parallel riser test is carried out, the adjustment of the distance can only be determined when the support is made, and it cannot be changed at any time during the test.

[0012] In addition, some phenomena that were not expected before the test may be found during the test, so that the test parameters need to be modified to increase the test groups for the newly found phenomena to determine the causes of the new phenomena or to determine the data of the new phenomena. However, the existing technology does not have this function, and the support needs to be redesigned and made for the test.

[0013] To solve the existing problems, we propose a test device for vortex-induced vibration interference phenomenon of deepwater riser bundle. SUMMARY

[0014] The purpose of the present application is to provide a test device for vortex-induced vibration interference phenomenon of deepwater riser bundle to solve the problems raised in the background art.

[0015] To achieve the above purpose, the present application provides the following technical solutions:

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

[0017] a support;

[0018] a first track and a second track, the first track and the second track being in sliding connection with the support and being lockable, the second track being arranged below the first track;

[0019] a clamping mechanism comprising a first clamping mechanism and a second clamping mechanism, the first clamping mechanism being in sliding connection with the first track and being lockable, the second clamping mechanism being in sliding connection with the second track and being lockable, the first clamping mechanism and the second clamping mechanism being arranged symmetrically;

[0020] The first clamping mechanism and the second clamping mechanism each comprise a frame, a clamp for clamping a riser, and a spring, the spring being in movable connection with the frame and being lockable, one end of the spring being fixedly connected with the clamp, and the other end being in movable connection with the frame and being lockable.

[0021] The motion trajectories of the first track and the second track are each 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 with the clamp of the first clamping mechanism, and the other end is fixedly connected with the clamp of the symmetric second clamping mechanism.

[0023] Preferably, the support is a hexahedron formed by 12 rod bodies fixedly connected two by two.

[0024] Preferably, the top 2 rod bodies of the support and the upper surfaces of the bottom 2 rod bodies of the support are each provided with a first slot body, the first track and the second track each comprise a first bolt body, the first bolt body penetrating and being threadedly connected with the corresponding first track and second track, one end of the first bolt body close to the first slot body being fixedly connected with a first sliding block, and the first slot body and the first sliding block cooperating.

[0025] Preferably, the first slot bodies are each dovetail slots, and the first sliding blocks are each dovetail sliding blocks.

[0026] Preferably, the first track and the second track are both rectangular plate bodies provided with channels, the upper surfaces of the first track and the second track are provided with second groove bodies, the first clamping mechanism and the second clamping mechanism both include second bolt bodies, the second bolt bodies penetrate and are threadedly connected with the frame, the ends of the second bolt bodies close to the second groove bodies are fixedly connected with second sliding blocks, and the second groove bodies and the second sliding blocks are matched.

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

[0028] Preferably, the number of springs in the first clamping mechanism and the second clamping mechanism is four.

[0029] The frame is a quadrilateral, the in-plane walls of the frame are all provided with third groove bodies, the ends of the springs away from the clamps are fixedly connected with third sliding blocks, and the third groove bodies and the third sliding blocks are matched and slidingly connected.

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

[0031] Preferably, the first track has two and is arranged side by side, and the second track has two and is arranged side by side.

[0032] Preferably, the clamp is a block body provided with a through hole, the clamping mechanism further includes a bolt for fixing the stand pipe, the bolt penetrates and is threadedly connected with the clamp, and the bolt abuts against the stand pipe in the test process.

[0033] Preferably, the first clamping mechanism and the second clamping mechanism are both provided with a plurality of bolts, the bolts penetrate and are threadedly connected with the frame, and the bolts are in contactable connection with the third sliding blocks.

[0034] The first track is above and the second track is below, and vertical support is provided for the stand pipe.

[0035] In the application, the spring is fixedly connected with the third sliding block, the third sliding block and the third groove body are matched and slidingly connected, the first track can slide on the support and can be locked, the second track can slide on the support and can be locked, the first clamping mechanism is slidingly connected with the first track and can be locked, the second clamping mechanism is slidingly connected with the second track and can be locked, and the end of the spring in the clamping mechanism is slidingly connected with the frame and can be locked. The above application design ensures that the test conditions in the experiment are realized, and the actual situation of the stand pipe in use is simulated.

[0036] Compared with the prior art, the application has the beneficial effects that: the application can realize continuous adjustment of the spacing of series and parallel stand pipes, can realize continuous adjustment of the spacing and flow angle of ladder arrangement stand pipes, and can control single or two-degree-of-freedom vibration of two model stand pipes respectively. BRIEF DESCRIPTION OF DRAWINGS

[0037] Fig. 1 It is a schematic diagram of the three-dimensional structure of the application.

[0038] Fig. 2 A schematic view of a perspective structure of the clamping mechanism of the present application;

[0039] Fig. 3 A schematic view of a cross-sectional structure of the clamping mechanism;

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

[0041] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0042] Please refer to Figs. 1 to 3 The present application provides several technical solutions:

[0043] Embodiment 1:

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

[0045] The support 1 is a hexahedron formed by fixing and connecting 12 rod bodies two by two, and the top 2 rod bodies of the support 1 and the upper surfaces of the bottom 2 rod bodies of the support 1 are each provided with a first groove body 100.

[0046] The first track 21 and the second track 22 are slidably connected and lockable with the support 1, the second track 22 is arranged below the first track 21, the movement trajectories of the first track 21 and the second track 22 are perpendicular to the movement trajectories of the first clamping mechanism 31 and the second clamping mechanism 32, the first track 21 has two and is arranged side by side, and the second track 22 has two and is arranged side by side. The lower surfaces of the two ends of the first track 21 and the second track 22 are provided with first sliding blocks, and the first sliding blocks are matched with the first groove body 100. The first track 21 and the second track 22 each comprise a first bolt body 201, the first bolt body 201 penetrates and is threadedly connected with the first track 21 and the second track 22, one end of the first bolt body 201 close to the first groove body 100 is fixedly connected with a first sliding block, and the first sliding block is matched with the first groove body 100. The first groove body 100 is a dovetail groove, and the first sliding block is a dovetail sliding block. The first track 21 and the second track 22 are rectangular plate bodies provided with channels, the upper surfaces of the first track 21 and the second track 22 are provided with second groove bodies 202, the first clamping mechanism 31 and the second clamping mechanism 32 each comprise a second bolt body 304, the second bolt body 304 penetrates and is threadedly connected with the frame 301, one end of the second bolt body 304 close to the second groove body 202 is fixedly connected with a second sliding block 305, and the second groove body 202 is matched with the second sliding block 305. The second groove body 202 is a dovetail groove, and the second sliding block 305 is a dovetail sliding block.

[0047] The first track 21 and the second track 22 are rectangular plate bodies provided with channels, the upper surfaces of the first track 21 and the second track 22 are provided with second groove bodies 202, the clamping mechanism comprises a first clamping mechanism 31 and a second clamping mechanism 32, the first clamping mechanism 31 is slidably connected and lockable with the first track 21, the second clamping mechanism 32 is slidably connected and lockable with the second track 22, 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 each comprise a frame 301, a clamp 302 for clamping a riser and a spring 303, the spring 303 is movably connected and lockable with the frame 301, one end of the spring 303 is fixedly connected with the clamp 302, and the other end is movably connected and lockable with the frame 301. The frame 301 is a quadrilateral, and the in-plane walls are each provided with a third groove body 311, one end of the spring 303 away from the clamp 302 is fixedly connected with a third sliding block 321, and the third groove body 311 is slidably connected with the third sliding block 321. The third groove body 311 is a dovetail groove, and the third sliding block 321 is a dovetail sliding block. The number of the springs 303 in the first clamping mechanism 31 and the second clamping mechanism 32 is four; the clamp 302 is a block body provided with a through hole, the clamping mechanism further comprises a bolt 4 for fixing the riser, the bolt 4 penetrates and is threadedly connected with the clamp 302, the bolt 4 abuts against the riser during the test, one end of the riser is fixedly connected with the clamp 302 of the first clamping mechanism 31, and the other end is fixedly connected with the clamp 302 of the symmetric 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 each provided with a plurality of bolts 4, and the bolts 4 are arranged in the frame 301 and are in contact with the third sliding block 321.

[0050] Working principle and use process of the application:

[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 passage of the clamp 302, and the bolts 4 on the clamp 302 are tightened against the riser. Then, the first bolt body 201 and the second bolt body 304 are tightened to lock the positions of the adjusted clamping mechanisms, the first track 21 and the second track 22. The device is started for testing. During the testing process, the third sliding block 321 that is not locked will slide in the third groove body 311 due to the action of the water flow, so as to ensure that the riser makes corresponding movement under the action of the vortex-induced force. If it is necessary to test the influence of the movement of the upstream or downstream riser of the series and stepped riser in one or two degrees of freedom on the downstream or upstream riser, and the influence of the movement of the parallel riser in one or two degrees of freedom on the adjacent riser, the corresponding bolts 4 of the frame 301 can be tightened to achieve the above-mentioned purposes.

[0052] Although the embodiments of the application have been shown and described (see the detailed description above), it can be understood by those of ordinary skill in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the application, and the scope of the application is defined by the appended claims and their equivalents.

[0053] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms “center”, “upper”, “lower”, “left”, “right”, “vertical”, “horizontal”, “inner”, “outer” and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms “first”, “second”, “third” are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0054] In the description of the application, it should be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

Claims

1. A test device for deep water riser bundle vortex-induced vibration interference phenomena, characterized by: The utility model relates to a kind of experimental device for testing the strength of vertical pipe, including Support (1); First track (21) and second track (22), the first track (21) and second track (22) are slidably connected with the support (1) and can be locked, the second track (22) is arranged below the first track (21); Clamping mechanism, the first clamping mechanism (31) and the second clamping mechanism (32) are included, the first clamping mechanism (31) is slidably connected with the first track (21) and can be locked, the second clamping mechanism (32) is slidably connected with the second track (22) and can be locked, the first clamping mechanism (31) and the second clamping mechanism (32) are symmetrically arranged, and 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 string, parallel riser during experiment; The first clamping mechanism (31) and the second clamping mechanism (32) include frame (301), clamp (302) for clamping riser and spring (303), the spring (303) is movably connected with the frame (301) and can be locked, one end of the spring (303) is fixedly connected with the clamp (302), and the other end is movably connected with the frame (301) and can be locked, the clamp (302) is block with through hole, and the clamping mechanism further includes bolt (4) for fixing riser, the bolt (4) is threadedly connected with the clamp (302), and bolt is pressed against riser during test process; The movement trajectory of the first track (21) and the second track (22) is perpendicular to the movement trajectory of the first clamping mechanism (31) and the second clamping mechanism (32); During test process, one end of riser is fixedly connected with the clamp (302) of the first clamping mechanism (31) in it, and the other end is fixedly connected with the clamp (302) of the symmetrical second clamping mechanism (32).

2. The test apparatus of vortex-induced vibration interference phenomena of a deep-water riser bundle according to claim 1, characterized in that: The support (1) is a hexahedron formed by 12 rod bodies fixedly connected two by two.

3. The test apparatus of vortex-induced vibration interference phenomena of a deep-water riser bundle according to claim 2, characterized in that: The top 2 rod bodies of the support (1) and the upper surfaces of the bottom 2 rod bodies of the support (1) are each provided with a first slot body (100), the first track (21) and the second track (22) each include a first peg body (201), the first peg body (201) is threadedly connected with the corresponding first track (21) and second track (22), and one end of the first peg body (201) close to the first slot body (100) is fixedly connected with a first sliding block, and the first sliding block cooperates with the first slot body (100).

4. The test apparatus of vortex-induced vibration interference phenomenon of deep water riser bundle according to claim 3, characterized in that, The first slot body (100) is all dovetail slot, and the first sliding block is all dovetail sliding block.

5. The test apparatus of vortex-induced vibration interference phenomenon of deep water riser bundle according to claim 1, characterized in that: The first track (21) and the second track (22) are rectangular plate bodies provided with channels, the upper surfaces of the first track (21) and the second track (22) are provided with second groove bodies (202), the first clamping mechanism (31) and the second clamping mechanism (32) each comprise a second bolt body (304), the second bolt body (304) penetrates and is threadedly connected with the frame (301), one end of the second bolt body (304) close to the second groove body (202) is fixedly connected with a second sliding block (305), and the second groove body (202) and the second sliding block (305) are matched.

6. The test apparatus of vortex-induced vibration interference phenomena of a deep-water riser bundle according to claim 5, characterized in that: The second groove body (202) is a dovetail groove, and the second sliding block (305) is a dovetail sliding block.

7. The test device for deep water riser VIV suppression according to claim 1, characterized in that: The number of the springs (303) in the first clamping mechanism (31) and the second clamping mechanism (32) is four. The frame (301) is a quadrilateral, four inner walls of the frame (301) are provided with third groove bodies (311), one end of the spring (303) away from the clamp (302) is fixedly connected with a third sliding block (321), the third groove body (311) and the third sliding block (321) are matched and are in sliding connection.

8. The test apparatus of vortex-induced vibration interference phenomena of a deep-water riser bundle according to claim 7, characterized in that: The third groove body (311) is a dovetail groove, and the third sliding block (321) is a dovetail sliding block.

9. The test device for deep water riser VIV suppression according to claim 1, characterized in that: The first track (21) has two and is arranged side by side, and the second track (22) has two and is arranged side by side.

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