CN103105281A - Test device used for researching marine riser interference laws under top tension ratio effect - Google Patents
Test device used for researching marine riser interference laws under top tension ratio effect Download PDFInfo
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- CN103105281A CN103105281A CN2013100144643A CN201310014464A CN103105281A CN 103105281 A CN103105281 A CN 103105281A CN 2013100144643 A CN2013100144643 A CN 2013100144643A CN 201310014464 A CN201310014464 A CN 201310014464A CN 103105281 A CN103105281 A CN 103105281A
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Abstract
The invention relates to a test device used for researching marine riser interference laws under a top tension ratio effect. The test device used for researching the marine riser interference laws under the top tension ratio effect comprises a support, stand pipe models, hinged joints and pulleys. The pulleys are fixed on the top of the support, the hinged joints comprise an upper hinged joint and a lower hinged joint, the lower ends of the stand pipe models are connected with the lower hinged joint, the upper ends of the stand pipe models are connected with the upper hinged joint, and double-screw bolts are arranged on a top plate of the upper hinged bolt. The test device used for researching the marine riser interference laws under the top tension ratio effect is characterized in that performed holes are formed in the top of the support and a baseboard of the support, the upper ends of the double-screw bolts are connected with steel strands penetrating through the top of the support, the steel strands are connected with balancing weight bypassing the pulleys, and the lower hinged joint is fixed on the baseboard of the support through the double-screw bolts and the performed holes on the baseboard. The test device used for researching the marine riser interference laws under the top tension ratio effect can effectively achieve hinge joint, exert a top tension ratio, simulate engineering practices through changing arrangement modes and gaps of the stand pipe models in the tests of the marine riser interference laws, and thus getting accurate test data and conclusions.
Description
Technical field
The invention belongs to marine riser facility laying technology field, be specifically related to a kind of test unit for research marine riser interference law.
Background technology
Marine riser is the main web member between ocean platform and subsea wellheads, is mainly used in transporting fluid, and guiding probing or oil well overhaul instrument and pipeline enter oil well etc.As a kind of contact channel in sea and seabed, can be used for fixed platform, floating platform and probing boats and ships etc.Pipeline between each ocean platform and subsea wellheads is all numerous, generally has multiple arrangement form, as in tandem, arrange and interlaced arrangement etc. shoulder to shoulder, when having circulation out-of-date, standpipe can be subject to the impact of other standpipe wake flows, and the interference between standpipe occurs.Due to the existence of interfering, make the form that comes off of kinematic behavior, dynamic response and the whirlpool of standpipe compare all with single standpipe larger variation can occur.And marine riser is mostly for delivery of combustible and explosive articles such as oil, rock gases, in case failure will cause serious environmental pollution and secondary disaster.Therefore, marine riser is carried out the experimental study of interference law, seem extremely necessary.
In the working condition of reality, the upper end of marine riser is connected with the slippage joint of platform or bottom of ship, the lower end is connected with subsea wellheads by universal joint, when platform or boats and ships move under wave action, standpipe has enough degree of freedom to move thereupon, and at platform or boats and ships, its length occurs to change when vertically shaking.Meanwhile, marine riser or the important component part of mooring system can be used as the support active redundancy pipeline.Therefore, when the interference test of carrying out marine riser, connected mode and top tension force are two factors must considering.
But interfere in test at the marine riser that carries out at present, often well model engineering is actual, makes the conclusion that draws not have cogency.The problem that exists in process of the test mainly contains: stem joint mostly is fixed, is not hinged; Though standpipe is tensioning state, can not adjusts and measure the size of top tension force; With in once testing, do not have or seldom study for spacing and the arrangement mode of standpipe.
Summary of the invention
The objective of the invention is to overcome above shortcomings in existing experimental technique, a kind of device that more meets the interference test of marine riser working condition is provided, thereby improved the accuracy that marine riser is interfered test.
A kind of test unit for research top tension force effect Ocean standpipe interference law mainly comprises support, riser model, articulated joint and pulley; Pulley is fixed in the top of support; Articulated joint comprises articulated joint and lower articulated joint, and the lower end of riser model is connected with lower articulated joint, and the upper end of riser model connects upper articulated joint; On the top board of upper articulated joint, double-screw bolt is installed, it is characterized in that: be respectively arranged with preformed hole on the top of support and base plate, the preformed hole that a top of the trellis is passed in the upper end of double-screw bolt connects steel strand wires, and steel strand wires are walked around pulley and are connected with balancing weight; Lower articulated joint is fixed on the base plate of support by the preformed hole on screw and base plate.
Through verification experimental verification, that device of the present invention can be realized effectively is hinged, apply top tension force, and can be by arrangement mode and the spacing of change riser model in the test of marine riser interference law, well model engineering is actual, thereby draws test figure and conclusion accurately.
Description of drawings
Fig. 1 is the front view of the test unit of the marine riser interference law under research of the present invention top tension force effect;
Fig. 2 is the stereographic map of Fig. 1;
Fig. 3 is the stereo amplification figure of upper articulated joint in Fig. 1.
Embodiment
Embodiment 1 as shown in Figure 1, a kind of test unit for research top tension force effect Ocean standpipe interference law mainly comprises support 2, riser model 5, pulley 1 and articulated joint; Pulley 1 is fixed in the top of support 2; Articulated joint comprises articulated joint 4 and lower articulated joint 6; The lower end of riser model 5 is connected with lower articulated joint 6, and the upper end of riser model 5 connects upper articulated joint 5; On the top board 14 of upper articulated joint 4, double-screw bolt is installed, the screw thread specification of double-screw bolt and the perforate on top board 14 match, and tighten and make its end to expose the bottom surface of top board 14, then select the nut of appropriate size again to tighten.
As shown in Figure 2, be provided with preformed hole on the top of support 2 and base plate 7, be respectively vertical preformed hole 11 and horizontal preformed hole 12.
The preformed hole at support 2 tops is passed in the upper end of double-screw bolt, curves crotch, is connected with an end of steel strand wires; Steel strand wires are walked around pulley, and the other end is connected with balancing weight 3.
As shown in Figure 2, the structure of lower articulated joint 6 and upper articulated joint 4 are just the same, during installation, upper articulated joint 4 are inverted, and are lower articulated joint 6; Pass preformed hole on the support base plate and the perforate on lower articulated joint top board with screw, lower articulated joint 6 is fixed on the base plate of support.
Riser model 5 refers to generally select steel pipe, copper pipe and pvc pipe etc. according to the material of experiment condition and the determined suitable simulation vortex-induced vibration of marine riser rule of scale model; The two ends of this riser model 5 are connected with the standpipe connecting hole of upper articulated joint 4, lower articulated joint 6 respectively.
Described pulley is 4, and pulley 1a, 1b are one group, and pulley 1c, 1d are one group; These two groups of pulleys respectively with riser model 5b and 5a, and articulated joint consists of two systems that apply top tension force.
As shown in Figure 3, upper articulated joint comprises footstock part, bearing cross and base portion; Footstock partly comprises top board 14, bearing seat I15 and bearing 18; Top board 14 center perforates are also ploughed silk, and during test, connecting stud also applies pulling force in the top, thereby realize applying the function of top tension force; Bearing seat I15 top is connected with top board 14, and the bottom perforate is also established draw-in groove, embeds bearing 18;
The bearing cross comprises bearing bracket stand I16 and bearing bracket stand II17; The two ends of bearing bracket stand I16, bearing bracket stand II17 are slightly thinner than center section, can just pass bearing; Center section overstriking and the perforate of bearing bracket stand I make bearing bracket stand II17 just pass and to block, and consist of " ten " font; Bearing bracket stand I16 is connected with bearing seat II19, and bearing bracket stand II17 is connected with bearing seat I15; The major function of bearing cross is to make the footstock part can rotate freely with base portion, thereby realizes hinged function fully.
Base portion comprises base 20, bearing seat II19 and bearing 18; Bearing seat II19 bottom is connected with base 20, and the top perforate is also established draw-in groove, embeds bearing 18; The function of bearing seat II19 is identical with the function of bearing seat I15; Open pipe connecting hole 21 in the bottom surface of base 20 and plough silk; Standpipe connecting hole 21 is connected with the riser model 5 of selecting.
The test unit of the research top tension force effect that the is used for Ocean standpipe interference law of embodiment 2 the present embodiment, basic identical with the apparatus structure of embodiment 1, difference only is: lower articulated joint 6 does not comprise top board 14, directly the screw of the bearing seat I15 of lower articulated joint and the preformed hole on the support base plate is fixed together with screw.Adopt this kind mode, can make lower articulated joint more firm with being connected of support.
As shown in Figure 2, adopt the test unit of above-described embodiment 1 when carrying out marine riser interference experimental study, need to use respectively at the two ends of riser model articulated joint 4 and lower articulated joint 6, and lower articulated joint 6 is fixed on the base plate 7 of test bracket.By constantly applying the top tension force of known dimensions, change the size of outflow and spacing and the arrangement mode of riser model, use the method for testing of strainometer and grating fibers, the interference law of marine riser is studied.
1, according to testing requirements and model scale, select suitable riser model (as copper pipe), then plough silk in its end, two ends, make its screw thread can be respectively match and tighten with the screw thread of the standpipe connecting hole 21 of upper articulated joint 4 and lower articulated joint 6;
2, according to the result of numerical simulation, locate along riser model with regard to the key point of signals collecting, evenly paste foil gauge along 90 ° of directions, and lead-in wire is connected with signal pickup assemblies such as dynamic resistance strain instruments;
3, the screw thread specification of double-screw bolt with to conform to the perforate of top board 14, tighten and make its end to expose the bottom surface of top board 14, then select the nut of appropriate size again to tighten; The upper end of double-screw bolt is passed respectively vertical preformed hole 11, the horizontal preformed hole 12 of a top of the trellis and curved crotch, be connected with an end of steel strand wires; Steel strand wires are walked around pulley, and the other end is connected with balancing weight;
4, according to the result of numerical simulation, in the upper end of outflow incoming flow direction, locate and lay doppler flowmeter, be used for the flow velocity of the real time measure outflow;
5, system assembles complete after, according to test condition, system debugs to signal acquiring system, top tension force application system, outflow mensuration.After each system works is normal, apply outflow.After treating that outflow is stable, add or reduce the balancing weight of known weight, can reach the effect that applies top tension force.
6, after the test under corresponding levels outflow condition is completed, according to the measurement result of doppler flowmeter, regulate the outflow flow velocity to next stage, then change top tension force, follow this workflow, until the interference off-test of this spacing and arrangement mode.
7, the spacing between longitudinally preformed hole 11 change riser model 5a, 5b, the position of moving respectively pulley 1b and 1c according to the position of riser model, follow procedures 5 and 6 flow process, complete the interference test of riser model longitudinal arrangement successively.
8, along the horizontal spacing between preformed hole 12 change riser model 5a, 5b, the position of moving respectively pulley 1a and 1b according to the position of riser model, follow procedures 5 and 6 flow process, complete the interference test that standpipe is arranged shoulder to shoulder successively.
9, the data that test gathered are processed, and the rule that the marine riser under the different outflows of research and top tension force effect is interfered test is reached a conclusion.
In whole system, because plurality of positions need to be boxed out, ploughed silk and complement one another, when testing preparation, need to according to test condition, need be designed for uniformity and process the size of perforate and the specification of screw thread in advance, to reach good test effect.
Claims (1)
1. a test unit of studying top tension force effect Ocean standpipe interference law, mainly comprise support, riser model, articulated joint and pulley; Pulley is fixed in the top of support; Articulated joint comprises articulated joint and lower articulated joint, and the lower end of riser model is connected with lower articulated joint, and the upper end of riser model connects upper articulated joint; On the top board of upper articulated joint, double-screw bolt is installed, it is characterized in that: be respectively arranged with preformed hole on the top of support and base plate, the preformed hole that a top of the trellis is passed in the upper end of double-screw bolt connects steel strand wires, and steel strand wires are walked around pulley and are connected with balancing weight; Lower articulated joint is fixed on the base plate of support by the preformed hole on screw and base plate.
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Cited By (6)
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| CN105319043A (en) * | 2015-06-18 | 2016-02-10 | 浙江海洋学院 | Vertically-arranged flexible pipe eddy torrent vibration experiment device |
| CN105424315A (en) * | 2015-11-05 | 2016-03-23 | 河海大学 | Device and method for measuring impact on horizontal bearing performance of pile foundation from waves |
| CN110031167A (en) * | 2019-04-04 | 2019-07-19 | 上海交通大学 | Simulate two-tube interference dynamic response experimental provision under vertical forced oscillation state |
| CN111076891A (en) * | 2020-01-02 | 2020-04-28 | 中国石油大学(华东) | Riser vortex-induced vibration simulation fixing device for experiments |
| CN115824617A (en) * | 2023-02-14 | 2023-03-21 | 中国石油大学(华东) | Deep sea non-riser pipe column system dynamic response test device, method and application |
| CN116202722A (en) * | 2023-04-26 | 2023-06-02 | 山东科技大学 | Marine riser group interference effect test device under combined action of internal and external flows |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105319043A (en) * | 2015-06-18 | 2016-02-10 | 浙江海洋学院 | Vertically-arranged flexible pipe eddy torrent vibration experiment device |
| CN105424315A (en) * | 2015-11-05 | 2016-03-23 | 河海大学 | Device and method for measuring impact on horizontal bearing performance of pile foundation from waves |
| CN110031167A (en) * | 2019-04-04 | 2019-07-19 | 上海交通大学 | Simulate two-tube interference dynamic response experimental provision under vertical forced oscillation state |
| CN111076891A (en) * | 2020-01-02 | 2020-04-28 | 中国石油大学(华东) | Riser vortex-induced vibration simulation fixing device for experiments |
| CN115824617A (en) * | 2023-02-14 | 2023-03-21 | 中国石油大学(华东) | Deep sea non-riser pipe column system dynamic response test device, method and application |
| CN115824617B (en) * | 2023-02-14 | 2023-08-08 | 中国石油大学(华东) | Power response test device, method and application of deep sea marine riser-free pipe column system |
| CN116202722A (en) * | 2023-04-26 | 2023-06-02 | 山东科技大学 | Marine riser group interference effect test device under combined action of internal and external flows |
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