Experimental device and method for simulating three-phase flow-induced vibration of deep-sea hydrate extraction riser

Abstract

The present invention discloses a three-phase flow-induced vibration simulation experimental device and method for a deep-sea hydrate production riser, comprising: an experimental water pool, a pipe string system, a data testing system, a three-phase flow flow generation system, and an experimental bench arranged in the experimental water pool; the three-phase flow flow generation system comprises an air compressor, a gas storage tank, a particle funnel, a water tank, a water pump, a solid pump, a mud pump, and a phase mixer; the pipe string system comprises a simulation pipe and an upper joint simulator and a lower joint simulator, the experimental bench comprises an experimental steel frame and a driving device, and the data testing system comprises a three-dimensional displacement sensor, an acceleration sensor, a dynamic strain gauge, a strain gauge, and a data acquisition instrument. The present invention develops and proposes a vibration simulation experimental device and an experimental method for a hydrate production riser, provides simulation experimental guidance for the design and operation of the riser, promotes the development of hydrate solid fluidization production technology, and has important academic significance and engineering application value.

Description

Technical Field

[0001] The invention relates to a three-phase flow-induced vibration simulation experimental device and method for a deep-sea hydrate mining riser, belonging to the technical field of oil and gas drilling and mining. Background Art

[0002] Natural gas hydrates are increasingly valued as a low-carbon unconventional energy source and are considered to be the most promising successor energy source in the 21st century. Realizing the commercial exploitation of natural gas hydrates is a major requirement for my country's energy security and deep-sea strategy. Academician Zhou Shouwei proposed the solid fluidization mining technology for marine hydrates. The core idea is to transfer the hydrate ore body to a closed gas, liquid, and solid multiphase mining riser through mechanical crushing and fluidization, and lift it to the offshore platform using external pressure. Its advantage is that it does not change the temperature and pressure of the hydrate ore layer, and directly crushes the ore body into solid particles for transmission, thereby avoiding a series of engineering geological and environmental disasters caused by the decomposition of seabed hydrates. It is an innovative technology for the green and safe exploitation of natural gas hydrates.

[0003] The solid fluidized hydrate mining system is mainly composed of an offshore platform, a seawater injection pipe, a mining riser, an intermediate warehouse, a conveying hose and a self-propelled mining vehicle. Its working principle is to use a mining vehicle to mine and crush the hydrate minerals on the seabed, and then transport them to the intermediate warehouse through a conveying hose, where they are mixed with the seawater in the injection pipe to form a hydrate slurry, which is then lifted to the sea surface platform with the help of a pump group and a mining riser. Therefore, the mining riser is the core equipment of the solid fluidized hydrate mining equipment and the artery of the entire system. During the lifting process, the mining riser is affected by the combined influence of internal gas-liquid-solid multiphase flow (the hydrate ore body is naturally decomposed into natural gas due to environmental factors), external ocean random loads, upper platform movement and its own structure (large aspect ratio structure - the ratio of length to diameter is greater than 1000), and is prone to complex nonlinear flow-induced vibrations (large vibrations and high-frequency vibrations), resulting in serious accidents such as instability, friction perforation, and fatigue fracture of the riser.

[0004] At present, the vibration analysis theory and safety control method of hydrate production riser are the main bottlenecks in the development of solid fluidized production technology. The lack of a hydrate wellbore gas-liquid-solid three-phase two-dimensional flow and a riser nonlinear flow-induced vibration simulation test bench has failed to fully reveal the wellbore gas-liquid-solid three-phase flow characteristics and the riser's vibration response characteristics, nonlinear behavior and parameter influence mechanism, making it difficult to effectively guide the design and operation of the riser. This has become a key scientific issue in breaking through the bottleneck of solid fluidized production technology. Summary of the invention

[0005] In order to overcome the problems in the prior art, the present invention provides a three-phase flow-induced vibration simulation experimental device for a deep-sea hydrate production riser.

[0006] The technical solution provided by the present invention to solve the above technical problems is: comprising an experimental water pool, a pipe string system, a data testing system, a three-phase flow generation system and an experimental bench arranged in the experimental water pool;

[0007] The three-phase flow system comprises an air compressor, an air storage tank, a particle hopper, a water tank, a water pump, a solid pump, a mud pump, and a phase mixer; the upper parts of the particle hopper, the solid pump, and the phase mixer are connected in sequence through pipelines; the middle parts of the air compressor, the air storage tank, and the phase mixer are connected in sequence through pipelines; the bottoms of the water tank, the water pump, and the phase mixer are connected in sequence through pipelines; the mud pump is connected to the bottom of the phase mixer through a pipeline;

[0008] The pipe string system includes a simulation pipe and an upper joint simulator and a lower joint simulator. The upper joint simulator includes a stiffness adjustment device and an upper slider. The upper end of the simulation pipe is connected to the upper slider through the stiffness adjustment device. The lower joint simulator includes a rotatable universal joint and a lower slider. The lower end of the simulation pipe is connected to the lower slider through the rotatable universal joint. Both ends of the simulation pipe are connected to a mud pump and a phase mixer through long hoses.

[0009] The experimental bench comprises an experimental steel frame and two driving devices, wherein rails are arranged at the upper and lower ends of the experimental steel frame, and the upper slider and the lower slider are respectively slidably installed in the two rails of the experimental steel frame, and the two driving devices respectively drive the upper slider and the lower slider to move in the rails;

[0010] The data testing system includes a three-dimensional displacement sensor, an acceleration sensor, a dynamic strain gauge, a strain gauge and a data acquisition instrument. The simulation tube is provided with a test short section, and the three-dimensional displacement sensor and the acceleration sensor are both installed on the test short section. The data acquisition instrument is electrically connected to the three-dimensional displacement sensor and the acceleration sensor respectively. The strain gauge is installed on the outer wall of the simulation tube, and the dynamic strain gauge is electrically connected to the strain gauge.

[0011] A further technical solution is that a solid flow meter and a valve are provided between the solid pump and the phase mixer.

[0012] A further technical solution is that a pressure reducing valve, an orifice flowmeter and a second valve are provided between the gas storage tank and the phase mixer.

[0013] A further technical solution is that a liquid flow meter and a valve three are provided between the water pump and the phase mixer.

[0014] A further technical solution is that an ultrasonic flow meter and a valve four are provided between the mud pump and the phase mixer.

[0015] A further technical solution is that the simulation tube is a polytetrafluoroethylene tube.

[0016] A further technical solution is that the driving device includes two winches and steel wire ropes, the two winches are respectively installed at the left and right ends of the experimental steel frame, and the two winches are connected to the simulation pipe through the steel wire ropes.

[0017] A further technical solution is that the number of the strain gauges is 32, and they are divided into 8 strain gauge groups, one strain gauge group has 4 strain gauges, and the 8 strain gauge groups are evenly distributed on the outer wall of the simulation tube from top to bottom.

[0018] A further technical solution is that the stiffness adjustment device is a spring.

[0019] A hydrate multiphase flow simulation experimental method comprises the following steps:

[0020] 1) Adjust the spring so that the simulated tube is in a tight state, similar to the actual situation;

[0021] 2) Place quartz sand into the particle funnel, inject clean water into the water tank, and turn on the air compressor to fill the air tank with air;

[0022] 3) Turn on the water pump and the solid pump, adjust the pressure reducing valve, control the orifice flowmeter, the liquid flowmeter and the solid flowmeter to adjust the content of different phases, open the valve, mix the gas-liquid-solid three phases in the phase mixer, turn off the mud pump, control the simulation tube to keep it still, turn off the data acquisition instrument, and do not measure data for a period of time;

[0023] 4) Observe the vibration of the simulated pipe string. When the vibration is relatively stable, turn on the motor to make the pipe string move back and forth. Turn on the data acquisition instrument to start measuring the vibration data of the simulated pipe and save it to the computer.

[0024] 5) changing the flowmeters of each phase, repeating steps 1), 2), 3), and 4), measuring the vibration data of the simulation tube under different phase contents, and processing the experimental data;

[0025] 6) Eliminate the influence of pre-tension in experimental data;

[0026] 7) Use modal analysis to process experimental data;

[0027] 8) Then use the frequency analysis method to process the experimental data.

[0028] The present invention has the following beneficial effects: the present invention forms a theoretical method for vibration analysis of hydrate production risers, provides theoretical guidance for the design and operation of risers, promotes the development of hydrate solid fluidization production technology, and has important academic significance and engineering application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the present invention.

[0030] As shown in the figure: 1-particle funnel; 2-solid pump; 3-solid flowmeter; 4-valve one; 5-air compressor; 6-air storage tank; 7-pressure reducing valve; 8-orifice flowmeter; 9-valve two; 10-water tank; 11-water pump; 12-liquid flowmeter; 13-valve three; 14-phase mixer; 15-valve four; 16-ultrasonic flowmeter; 17-mud pump; 18-lower slider; 19-rotatable universal joint; 20-simulation tube; 21-strain gauge; 22-spring; 23-upper slider; 24-experimental steel frame; 25-slide rail. DETAILED DESCRIPTION

[0031] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. 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.

[0032] like Figure 1 As shown, the three-phase flow-induced vibration simulation experimental device for deep-sea hydrate production riser of the present invention comprises an experimental water pool, a pipe string system, a data testing system, a three-phase flow generation system and an experimental bench arranged in the experimental water pool;

[0033] The three-phase flow making system comprises an air compressor 5, an air storage tank 6, a particle hopper 1, a water tank 10, a water pump 11, a solid pump 2, a mud pump 17, and a phase mixer 14; the upper parts of the particle hopper 1, the solid pump 2, and the phase mixer 14 are connected in sequence through pipelines; the middle parts of the air compressor 5, the air storage tank 6, and the phase mixer 14 are connected in sequence through pipelines; the bottoms of the water tank 10, the water pump 11, and the phase mixer 14 are connected in sequence through pipelines; the mud pump 17 is connected to the bottom of the phase mixer 14 through a pipeline; a solid flowmeter 3 and a valve 1 4 are provided between the solid pump 2 and the phase mixer 14, a pressure reducing valve 7, an orifice flowmeter 8, and a valve 2 9 are provided between the air storage tank 6 and the phase mixer 14, a liquid flowmeter 12 and a valve 3 13 are provided between the water pump 11 and the phase mixer 14, and an ultrasonic flowmeter 16 and a valve 4 15 are provided between the mud pump 17 and the phase mixer 14;

[0034] The pipe string system includes a simulated pipe 20 and an upper joint simulator and a lower joint simulator. The upper joint simulator includes a spring 22 and an upper slider 23. The upper end of the simulated pipe 20 is connected to the upper slider 23 through the spring 22. The lower joint simulator includes a rotatable universal joint 19 and a lower slider 18. The lower end of the simulated pipe 20 is connected to the lower slider through a rotatable universal joint. Both ends of the simulated pipe 20 are connected to a mud pump 17 and a phase mixer 14 respectively through long hoses.

[0035] The experimental bench comprises an experimental steel frame 24 and two driving devices. The upper and lower ends of the experimental steel frame 24 are provided with tracks 25. The upper slider 23 and the lower slider 18 are respectively slidably installed in the two tracks 25 of the experimental steel frame 24. The two driving devices respectively drive the upper slider 23 and the lower slider 18 to move in the tracks 25. The size of the experimental water pool is 30m×15m×3m. The experimental steel frame is welded by I-shaped steel, with a length of 12.5m and a height of 3.5m.

[0036] The data testing system includes a three-dimensional displacement sensor, an acceleration sensor, a dynamic strain gauge, a strain gauge 21 and a data acquisition instrument. A test short section is provided on the simulation tube 20, and the three-dimensional displacement sensor and the acceleration sensor are both installed on the test short section. The data acquisition instrument is electrically connected to the three-dimensional displacement sensor and the acceleration sensor respectively. The strain gauge 21 is installed on the outer wall of the simulation tube 20, and the dynamic strain gauge is electrically connected to the strain gauge 21.

[0037] In this embodiment, the upper end of the simulation tube 20 uses a spring 22 to simulate the effect of the heave compensator, and the lower end uses a rotatable universal joint 19 to connect with the lower slider 18. In order to simulate the situation that the low-order vibration of the deep-sea hydrate production riser is controlled by tension and the bending stiffness has little effect as realistically as possible, the riser model is proposed to use Teflon tubes (polytetrafluoroethylene) with a low elastic modulus, and at the same time, a bracket with sufficient rigidity (using an I-shaped steel frame) is made for the riser column model to reduce its influence on the riser vibration. The fixed pulley plus the winch realizes the simultaneous movement of the upper and lower ends to simulate the uniform flow effect. The vibration response of the riser is measured by a three-dimensional displacement sensor, an acceleration sensor, a dynamic strain gauge and a strain gauge to verify and correct the gas-liquid-solid three-phase flow-induced vibration model of the hydrate production riser.

[0038] In this embodiment, the driving device includes two winches and steel wire ropes. The two winches are respectively installed at the left and right ends of the experimental steel frame 24, and the two winches are connected to the upper end or the lower end of the simulation tube 20 through the steel wire ropes; in this way, when the simulation tube 20 needs to move to the left on the track 25, the two winches at the left end of the experimental steel frame 24 rotate forward, and the two winches at the other end rotate reversely; conversely, when the simulation tube 20 needs to move to the right on the track 25, the two winches at the left end of the experimental steel frame 24 rotate reversely, and the two winches at the other end rotate forward.

[0039] In this embodiment, if Figure 1 As shown, the number of the strain gauges 21 is 32, which are divided into 8 strain gauge groups. One strain gauge group has 4 strain gauges 21, and the 8 strain gauge groups are evenly distributed on the outer wall of the simulation tube 20 from top to bottom.

[0040] A hydrate multiphase flow simulation experimental method, characterized in that it comprises the following steps:

[0041] 1) Adjust the spring 22 so that the simulated tube 20 is in a tight state, similar to the actual situation;

[0042] 2) Put quartz sand into the particle funnel 1, inject clean water into the water tank 10, turn on the air compressor 5, and fill the air storage tank 6 with air;

[0043] 3) Turn on the water pump 11 and the solid pump 2, adjust the pressure reducing valve 7, control the orifice flowmeter 8, the liquid flowmeter 12 and the solid flowmeter 3 to adjust the content of different phases, open the valve, mix the gas-liquid-solid three phases in the phase mixer, turn off the mud pump 17 and control the simulation tube 20 to keep it still, turn off the data acquisition instrument, and do not measure data for a period of time;

[0044] 4) Observe the vibration of the simulated pipe string. When the vibration is relatively stable, turn on the motor to make the pipe string move back and forth. Turn on the data acquisition instrument to start measuring the vibration data of the simulated pipe and save it to the computer.

[0045] 5) changing the flowmeters of each phase, repeating steps 1), 2), 3), and 4), measuring the vibration data of the simulation tube 20 at different contents of each phase, and processing the experimental data;

[0046] 6) Eliminate the influence of pre-tension in experimental data;

[0047] Pre-tension will also vibrate periodically and affect the experimental data, so the influence of pre-tension must be eliminated. The vibration in the CF (crossflow) direction is symmetrical, and the strain caused by pre-tension is also equal. Therefore, the bending strain caused by vibration in the CF direction is:

[0048]

[0049] Where: ε VIV-CF is the bending strain in the CF direction; ε CF1 is the bending strain generated in the CF1 direction; ε CF2 is the bending strain generated in the CF2 direction.

[0050] During the stable period, the mean of the bending strain time history caused by vibration can be considered to be zero, so it can be assumed that:

[0051]

[0052] Where: is the time history average of the bending strain caused by vibration.

[0053] From equations (1) and (2), we can get

[0054]

[0055]

[0056] Therefore, the bending strain caused by vibration in the IL (inline) direction is:

[0057]

[0058] 7) Use modal analysis to process experimental data;

[0059] Assuming that the tubing string undergoes a small deformation movement, the displacement of the axis of the completion tubing string in the flow direction at a certain time can be expressed by the following formula:

[0060]

[0061] Where: t is time (s); z is the axial coordinate of the pipe string; l is the length of the pipe string (m); w(t,z) is the displacement on the axis (m); φ i (z) is the mode shape; P i (t) is the modal weight.

[0062] The curvature of the flow direction of the pipe axis is:

[0063]

[0064] The pipe column can be simplified as a simply supported beam, and its vibration mode can be expressed as:

[0065]

[0066] Substituting the displacement mode shape into equation (11), the curvature can be transformed into:

[0067]

[0068] The curvature and strain are related as follows:

[0069]

[0070] Where: ε(t,z) is the flow surface strain of the pipe string; R is the pipe string radius (m).

[0071] Combining equation (8) and equation (10), we can get

[0072]

[0073] Where: θ i (z) is the mode shape; e1(t) is the mode weight.

[0074]

[0075]

[0076] The coordinate along the length direction is Z m , m = 1, 2, 3...M, the measured signal is expressed as:

[0077] C m (t)=ε(t,Z m )+η m (t) (14)

[0078] Where: C m (t) is the measurement signal; ε(t,Z m ) is the strain signal; η m (t) is the noise signal.

[0079] Assuming that the natural vibration mode is a sine function and assuming that the analysis using the Nth order mode can meet the requirements, then,

[0080]

[0081] First, the expansion of the i-th order mode shape at M test points is:

[0082] φ i =[φ i (z1),φ i (z1),...,φ i (z M )] T (16)

[0083] Then the N-order mode is expanded at M test points to obtain an M×N matrix:

[0084] φ=[φ1,φ1,...,φ N ] (17)

[0085] The matrix of measurement signal, noise signal and modal weight is as follows:

[0086] c(t)=[c1(t),c2(t),...,c M (t)] T (18)

[0087] η(t)=[η1(t),η2(t),...,η M (t)] T (19)

[0088] e(t)=[e1(t),e2(t),...,e N (t)] T (20)

[0089] Formula (18) can be written as:

[0090] c(t)=φe(t)+η(t) (21)

[0091] For the above formula, there is an exact solution only when the number of measurement points is equal to the number of modes involved in the calculation, that is, when M=N. Without considering the noise error, the solution is:

[0092]

[0093] Use in the formula Represents the displacement weight obtained by the solution. Due to the influence of noise, There is a certain deviation from the true solution e(t). When the number of modes involved in the calculation is less than the number of measurement points, equation (20) does not hold and the least squares method is needed to solve it, which can be obtained:

[0094]

[0095] In the formula, H=(φ T φ) -1 φ T , obtained from formula (23) After that, the column displacement w(t,z) can be obtained by equations (21) and (22).

[0096] 8) Then use frequency analysis method to process the experimental data;

[0097] When vibration occurs, the pipe string will vibrate periodically in both the lateral and flow directions, which can be expressed by the Fourier series as follows:

[0098]

[0099] Where: A n is the amplitude; n is the angular frequency; t is a certain moment; θ is the initial phase angle.

[0100] Since the vibration frequency is a periodic function that does not change with time during the vibration process, the original waveform of the signal can be decomposed into a sine wave or a cosine wave. After sampling at equal intervals, the continuous signal is N discrete points. At this time, the series can be expressed as:

[0101]

[0102] Where: A0, A k , B k , A N / 2 are constants respectively; N is the serial number of the continuous signal corresponding to a certain moment.

[0103] Solving equation (25), the highest fitting frequency number n is N / 2, which is called the Nyquist frequency. In summary, by performing fast Fourier transform on the collected signal, the corresponding tension response amplitude and response frequency can be obtained.

[0104] The simulation tube in this method is designed using similar theory:

[0105] (1) Geometric similarity

[0106] The geometrical dimensions of the corresponding parts of the entity and the model are proportional to a constant. Let L s , B s ,d s and L m , B m ,d m Represent the length, width and draft of the entity and model respectively, then:

[0107]

[0108] Where: λ is the scale ratio;

[0109] The corresponding area A of the entity and the model s With A m The ratio is:

[0110]

[0111] The corresponding volume of the entity and the model and The ratio is:

[0112]

[0113] (2) Froude similarity criterion

[0114] The model experiment also needs to satisfy Froude similarity, that is, the Froude numbers (Fr) of the model and the entity need to be equal, so as to ensure the correct similarity relationship between the gravity and inertia effects between the model and the entity.

[0115] Table 1 Conversion relationship between various physical quantities of the model and the entity

[0116]

[0117] The above description is not intended to impose any form of limitation on the present invention. Although the present invention has been disclosed through the above embodiments, it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. A three-phase flow-induced vibration simulation experimental device for deep-sea hydrate extraction riser, characterized in that: It includes an experimental water pool, a pipe string system, a data testing system, a three-phase flow generation system and an experimental bench set in the experimental water pool; The three-phase flow system comprises an air compressor, an air storage tank, a particle hopper, a water tank, a water pump, a solid pump, a mud pump, and a phase mixer; the upper parts of the particle hopper, the solid pump, and the phase mixer are connected in sequence through pipelines; the middle parts of the air compressor, the air storage tank, and the phase mixer are connected in sequence through pipelines; the bottoms of the water tank, the water pump, and the phase mixer are connected in sequence through pipelines; the mud pump is connected to the bottom of the phase mixer through a pipeline; The pipe string system includes a simulation pipe and an upper joint simulator and a lower joint simulator. The upper joint simulator includes a stiffness adjustment device and an upper slider. The upper end of the simulation pipe is connected to the upper slider through the stiffness adjustment device. The lower joint simulator includes a rotatable universal joint and a lower slider. The lower end of the simulation pipe is connected to the lower slider through the rotatable universal joint. Both ends of the simulation pipe are connected to a mud pump and a phase mixer through long hoses. The experimental bench comprises an experimental steel frame and two driving devices, wherein rails are arranged at the upper and lower ends of the experimental steel frame, and the upper slider and the lower slider are respectively slidably installed in the two rails of the experimental steel frame, and the two driving devices respectively drive the upper slider and the lower slider to move in the rails; The data testing system includes a three-dimensional displacement sensor, an acceleration sensor, a dynamic strain gauge, a strain gauge and a data acquisition instrument. The simulation tube is provided with a test short section, and the three-dimensional displacement sensor and the acceleration sensor are both installed on the test short section. The data acquisition instrument is electrically connected to the three-dimensional displacement sensor and the acceleration sensor respectively. The strain gauge is installed on the outer wall of the simulation tube, and the dynamic strain gauge is electrically connected to the strain gauge.

2. The three-phase flow-induced vibration simulation experimental device for deep-sea hydrate production riser according to claim 1 is characterized in that: A solid flow meter and a valve are arranged between the solid pump and the phase mixer.

3. The three-phase flow-induced vibration simulation experimental device for deep sea water hydrate production riser according to claim 1 is characterized in that: A pressure reducing valve, an orifice flowmeter and a second valve are arranged between the gas storage tank and the phase mixer.

4. The three-phase flow-induced vibration simulation experimental device for deep-sea hydrate extraction riser according to claim 1 is characterized in that: A liquid flow meter and a valve are arranged between the water pump and the phase mixer.

5. The three-phase flow-induced vibration simulation experimental device for deep sea water hydrate production riser according to claim 1 is characterized in that: An ultrasonic flow meter and a valve 4 are arranged between the mud pump and the phase mixer.

6. The three-phase flow-induced vibration simulation experimental device for deep-sea hydrate production riser according to claim 1 is characterized in that: The simulation tube is a polytetrafluoroethylene tube.

7. The three-phase flow-induced vibration simulation experimental device for deep-sea hydrate production riser according to claim 1 is characterized in that: The driving device includes two winches and steel wire ropes. The two winches are respectively installed at the left and right ends of the experimental steel frame, and the two winches are connected to the simulation pipe through the steel wire ropes.

8. The three-phase flow-induced vibration simulation experimental device for deep sea water hydrate production riser according to claim 1 is characterized in that: The number of the strain gauges is 32, which are divided into 8 strain gauge groups. One strain gauge group has 4 strain gauges, and the 8 strain gauge groups are evenly distributed on the outer wall of the simulation tube from top to bottom.

9. The three-phase flow-induced vibration simulation experimental device for deep-sea hydrate production riser according to claim 1 is characterized in that: The stiffness adjusting device is a spring.

10. A hydrate multiphase flow simulation experimental method, characterized in that: The following steps are involved: 1) Adjust the spring so that the simulated tube is in a tight state, similar to the actual situation; 2) Place quartz sand into the particle funnel, inject clean water into the water tank, and turn on the air compressor to fill the air tank with air; 3) Turn on the water pump and the solid pump, adjust the pressure reducing valve, control the orifice flowmeter, the liquid flowmeter and the solid flowmeter to adjust the content of different phases, open the valve, mix the gas-liquid-solid three phases in the phase mixer, turn off the mud pump, control the simulation tube to keep it still, turn off the data acquisition instrument, and do not measure data for a period of time; 4) Observe the vibration of the simulated pipe string. When the vibration is relatively stable, turn on the motor to make the pipe string move back and forth. Turn on the data acquisition instrument to start measuring the vibration data of the simulated pipe and save it to the computer. 5) changing the flowmeters of each phase, repeating steps 1), 2), 3), and 4), measuring the vibration data of the simulation tube under different phase contents, and processing the experimental data; 6) Eliminate the influence of pre-tension in experimental data; 7) Use modal analysis to process experimental data; 8) Then use the frequency analysis method to process the experimental data.

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