A device and method for simulating the propagation of continuous pulse waves in multiphase media

Abstract

An embodiment of the present invention provides a device and method for simulating the propagation of continuous pulse waves in a multiphase medium, which relates to the technical field of oil and gas field exploration and development. The device includes: a sand-filled shock tube, which is filled with a filling medium and is used to simulate a multiphase medium environment; a plurality of shock wave pressure sensors, which are used to monitor the pulse pressure signal in the sand-filled shock tube; a continuous pulse wave generating assembly, including a plurality of pulse wave generators, which are used to generate pulse waves and propagate them to the sand-filled shock tube; a constant pressure gas source, which is used to inflate the pulse wave generator; an electromagnetic valve, which is used to regulate the inflation of the corresponding pulse wave generator; and a controller, which is used to control the opening and closing of the electromagnetic valve and receive the pulse pressure signal from the shock wave pressure sensor. The device overcomes the defect that the existing technology cannot simulate the propagation law of continuous pulse waves in multiphase media by obtaining quantitative pressure change data of continuous pulse waves propagating in multiphase media.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas field exploration and development, and in particular to a device and method for simulating the propagation of continuous pulse waves in a multiphase medium. Background Art

[0002] As conventional oil and gas resource development enters its mid- to late-stage, further intensifying the exploration and development of unconventional reservoirs is crucial for ensuring energy security. Transmitting and receiving wave signals into reservoirs and inverting reservoir physical properties through waveform monitoring is the most commonly used oil and gas exploration technique. Furthermore, wave motion production has also been proven to be a clean oil and gas field development technology. The applied excitation waves can generate additional pressure gradients at pore throats, promoting fluid flow and ultimately expanding the swept volume.

[0003] The propagation and attenuation patterns of waves in multiphase reservoir media, such as oil, gas, water, and rock, are key to distinguishing between different phases and rock types. Current research on wave propagation in porous media focuses on numerical simulations of wave fields, such as those reported in CN119781031A, CN119884608A, CN114861415A, CN119808449A, CN114779325A, and CN112987088A. Physical model research primarily utilizes laboratory similarity theory to create physical models. While there are techniques for simulating wave propagation in porous media containing fluids, such as those reported in CN115966129A, these techniques are only qualitative and cannot monitor quantitative pressure variations.

[0004] A shock tube is a device that generates shock waves by compressing gas within a geometrically restricted pipe, causing it to explode and expand when the pressure reaches its limit. Combined with shock wave monitoring sensors, shock tubes can quantitatively measure the pressure propagation patterns of shock waves, thereby resolving the aforementioned issues. However, current applications of shock tubes primarily focus on studying the propagation and dissipation patterns of shock waves in air. Furthermore, shock waves occur only once and cannot simulate the generation of pulse waves, as exemplified by the publications in CN119649783A, CN117470038A, CN117074467A, and CN113777213A.

[0005] Prior art 1: Chinese invention patent application with publication number CN119043631A filed by the National University of Defense Technology of the People's Liberation Army of China in 2024. This patent application provides a test device and method for simulating the shock wave propagation law and wave absorption efficiency of a wave absorption chamber, including a driving section mainly composed of a shock tube device for generating simulated shock waves, an input detection section, and an output detection section. The first test section is equipped with a simulated wave absorption chamber to be tested, and shock wave pressure sensors are installed on the input detection section and the output detection section near the first test section and on the first test section respectively, for testing the shock wave parameters at each characteristic position. This patent application can test and obtain the shock wave propagation law and wave absorption efficiency of various simulated wave absorption chambers, is easy to implement, and has strong versatility. However, this patent application has the following problems:

[0006] (1) The main monitoring method is to simply test the maximum wave intensity of the shock wave before and after passing through the wave attenuation chamber to calculate the wave attenuation rate, but it cannot evaluate the propagation law of the pulse wave;

[0007] (2) Unable to simulate the excitation process of continuous pulse waves;

[0008] (3) It is impossible to simulate the propagation law of pulse waves in multiphase media.

[0009] Prior art 2: A Chinese invention patent application with publication number CN113848392A filed by Xidian University in 2021. This patent application provides a multi-frequency-point low-frequency electromagnetic wave propagation characteristic measurement device and test method based on a shock tube. The device uses a low-frequency electromagnetic composite probe to sense multi-frequency-point low-frequency electromagnetic wave signals under the influence of plasma, outputs low-frequency electric field signals and low-frequency magnetic field signals, and a multi-frequency receiving and measuring device obtains the propagation characteristics of multi-frequency-point low-frequency electromagnetic waves by processing waveform data; and uses a multi-frequency-point transmitting device to generate and radiate multi-frequency-point low-frequency electromagnetic wave signals outward. This patent application realizes the simultaneous measurement of the electric field component and the magnetic field component of multi-frequency-point low-frequency electromagnetic waves at the same position based on the improved shock tube, improves the consistency of the experimental conditions of the shock plasma parameters, and improves the measurement efficiency of the shock tube experiment. However, this patent application has the following problems:

[0010] (1) This device combines two devices: a multi-frequency point generator to generate electromagnetic waves and an ignition device to generate shock waves. Its essence is to use the shock waves excited by the shock tube to form a plasma wrapped around the low-frequency electromagnetic composite probe. The purpose is to use the low-frequency electromagnetic composite probe to sense the influence of the plasma on the low-frequency electromagnetic waves generated by the multi-frequency point generator. This device cannot be used to study the propagation law of the shock tube excitation wave.

[0011] (2) This device also does not consider the study of the propagation law of pulse waves in multiphase media.

[0012] Therefore, it is urgent to develop a device to solve the above problems in the prior art. Summary of the Invention

[0013] The purpose of the embodiments of the present invention is to provide a device and method for simulating the propagation of continuous pulse waves in a multiphase medium, so as to solve at least one problem existing in the prior art.

[0014] In order to achieve the above-mentioned objectives, in the first aspect, an embodiment of the present invention provides a simulation device for the propagation of continuous pulse waves in a multiphase medium, the device comprising: a sand-filled shock tube, which is filled with a filling medium and is used to simulate a multiphase medium environment; a plurality of shock wave pressure sensors, respectively arranged at preset pressure measuring positions in the sand-filled shock tube, for monitoring the pulse pressure signal in the sand-filled shock tube; a continuous pulse wave generating assembly, connected to the sand-filled shock tube, comprising a plurality of pulse wave generators, for generating pulse waves and propagating them to the sand-filled shock tube; a constant pressure gas source, connected to the pulse wave generator, for inflating the pulse wave generator; an electromagnetic valve, arranged on a pipeline between the constant pressure gas source and the pulse wave generator, corresponding one-to-one to the pulse wave generator, for regulating the inflation of the corresponding pulse wave generator; a controller, for controlling the opening and closing of the electromagnetic valve, and receiving the pulse pressure signal of the shock wave pressure sensor.

[0015] Optionally, the filling medium includes sand filling and multiphase medium, wherein the sand filling includes no sand filling or quartz sand, and the multiphase medium includes pure air, saturated water or saturated oil.

[0016] Optionally, the pulse wave generator includes: an inflation pressure tube, the first end of which is connected to the constant pressure gas source and is used to receive gas from the constant pressure gas source; an inflation pressure tube sealing end cap, which is arranged at the second end of the inflation pressure tube and is used to seal the second end of the inflation pressure tube; a second diaphragm, which is arranged at the second end of the inflation pressure tube and is used to rupture and release high-pressure gas to generate a pulse wave when the pressure in the inflation pressure tube reaches a preset pressure threshold.

[0017] Optionally, the controller is used to perform the following operations: control the solenoid valves to open in sequence based on a preset time interval and a preset number of openings, and after each solenoid valve is opened, perform the following steps: when the second diaphragm of the pulse wave generator corresponding to the solenoid valve ruptures to form a pulse wave, control the solenoid valve to close; receive the pulse pressure signal of the shock wave pressure sensor; when the shock wave pressure sensor has no data response, stop receiving the signal; draw a pressure curve based on the pulse pressure signal received from the shock wave pressure sensor to obtain a simulation result of the propagation of a continuous pulse wave in a multiphase medium.

[0018] Optionally, the continuous pulse wave generating assembly also includes: a wave propagation tube, the first end of the wave propagation tube is connected to the pulse wave generator, and the second end of the wave propagation tube is connected to the first end of the sand-filled shock tube, for forming a propagation channel for the pulse wave from the pulse wave generator to the sand-filled shock tube.

[0019] Optionally, the device also includes: a first end cover, which adopts a threaded structure and is provided with a rubber gasket, which is used to seal the connection between the wave propagation tube and the sand-filled shock tube; a first diaphragm, which is arranged at the connection between the wave propagation tube and the sand-filled shock tube, and is used to separate the wave propagation tube and the sand-filled shock tube.

[0020] Optionally, the device further includes: a pressure sensor monitoring chamber, which corresponds one-to-one to the shock wave pressure sensor and is arranged outside the corresponding shock wave pressure sensor, for separating the shock wave pressure sensor from the filling medium to provide a clean space for the shock wave pressure sensor.

[0021] Optionally, the device further includes: a second end cover, disposed at the second end of the sand-filled shock tube, for sealing the second end of the sand-filled shock tube.

[0022] Optionally, the device also includes: an outlet end, located on the second end cover, for discharging the fluid in the sand-filled shock tube; a filter screen, arranged between the second end of the sand-filled shock tube and the outlet end, for preventing solids in the sand-filled shock tube from entering the outlet end.

[0023] On the other hand, the present invention provides a method for simulating the propagation of continuous pulse waves in a multiphase medium. The method is based on the simulation of any one of the devices described above, and the method includes: controlling the electromagnetic valves to open in sequence based on a preset time interval and a preset number of openings, and after each of the electromagnetic valves is opened, performing the following steps: when the second diaphragm of the pulse wave generator corresponding to the electromagnetic valve ruptures to form a pulse wave, controlling the electromagnetic valve to close; receiving the pulse pressure signal of the shock wave pressure sensor; when the shock wave pressure sensor has no data response, stopping receiving the signal; drawing a pressure curve based on the pulse pressure signal received from the shock wave pressure sensor to obtain a simulation result of the propagation of a continuous pulse wave in a multiphase medium.

[0024] Optionally, the method further includes: performing comparative analysis on the pressure curves obtained under different simulation parameters to obtain difference analysis results of the pulse wave propagation laws under different simulation parameters, wherein the simulation parameters include the type of the filling medium, the preset time interval, the preset opening number, the pressure resistance value of the second diaphragm, and the temperature.

[0025] Through the above technical solution, a filling medium can be filled in the sand-filled shock tube to simulate a multiphase medium environment, thereby simulating the propagation law of pulse waves in a multiphase medium. The continuous pulse wave generating component includes a plurality of pulse wave generators, and a controller is used to control a plurality of electromagnetic valves to be opened continuously at a certain time interval, so that the plurality of pulse wave generators can generate continuous pulse waves, thereby simulating the excitation process of continuous pulse waves. A shock wave pressure sensor is provided in the sand-filled shock tube. The sensor can monitor the pulse pressure signal in the sand-filled shock tube and transmit the signal to the controller, thereby obtaining quantitative pressure change data of the pulse wave propagating in the multiphase medium, overcoming the defect that the existing technology cannot simulate the propagation law of continuous pulse waves in the multiphase medium. In addition, the design principle of the present invention is reliable, the structure is simple, and it has a very broad application prospect, which is of great significance to promoting oil and gas exploration and development.

[0026] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following detailed description, they are used to explain the embodiments of the present invention, but do not constitute a limitation of the embodiments of the present invention. In the accompanying drawings:

[0028] Figure 1 Schematic diagram of the structure of a simulation device for continuous pulse wave propagation in a multiphase medium provided by an embodiment of the present invention;

[0029] Figure 2 1 is a schematic structural diagram of a continuous pulse wave generating assembly provided by an embodiment of the present invention;

[0030] Figure 3 1 is a flow chart of a method for simulating the propagation of a continuous pulse wave in a multiphase medium provided by an embodiment of the present invention;

[0031] Figure 4 1 is a schematic diagram of pressure curves at two pressure measuring points in the first set of simulation experiments provided by an embodiment of the present invention;

[0032] Figure 5 1 is a schematic diagram of pressure curves at two pressure measuring points in the second set of simulation experiments provided by an embodiment of the present invention;

[0033] Figure 6 1 is a schematic diagram of pressure curves at two pressure measuring points in the third set of simulation experiments provided by an embodiment of the present invention;

[0034] Figure 7 1 is a schematic diagram of pressure curves at two pressure measuring points in the fourth set of simulation experiments provided by an embodiment of the present invention;

[0035] Figure 8 3 is a schematic diagram of pressure curves at two pressure measuring points in the fifth set of simulation experiments provided by an embodiment of the present invention.

[0036] Description of Reference Numerals

[0037] 1 Constant pressure gas source 2 Solenoid valve

[0038] 3. Solenoid valve controller 4. Pulse wave generator

[0039] 5 computers 6 wave propagation tube

[0040] 7 first end cap 8 first diaphragm

[0041] 9 Shock wave pressure sensor 10 Pressure sensor monitoring room

[0042] 11 Sand-filled shock tube 12 Second end cap

[0043] 13 filter 14 outlet

[0044] 4-1 Inflatable pressure tube 4-2 Inflatable pressure tube sealing end cap

[0045] 4-3 Second diaphragm DETAILED DESCRIPTION

[0046] The following describes the specific implementation of the embodiment of the present invention in detail with reference to the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the embodiment of the present invention and is not used to limit the embodiment of the present invention.

[0047] It should be noted that the acquisition, transmission, storage, use, and processing of data in the technical solution of this application are in compliance with the relevant provisions of laws and regulations. In the embodiments of this application, certain software, components, models, and other existing solutions in the industry may be mentioned. These should be considered as exemplary. Their purpose is only to illustrate the feasibility of implementing the technical solution of this application, but it does not mean that the applicant has or will necessarily use such solutions.

[0048] Figure 1 FIG. 1 is a schematic diagram of a structure of a simulation device for continuous pulse wave propagation in a multiphase medium provided by an embodiment of the present invention. Figure 1 As shown, the device includes the following structure.

[0049] The sand-filled shock tube 11 is filled with a filling medium and is used to simulate a multiphase medium environment. The length of the sand-filled shock tube 11 can be set according to actual needs.

[0050] Multiple shock wave pressure sensors 9 are installed at pre-set pressure measurement locations within the sand-filled shock tube 11 to monitor the pulse pressure signal within the sand-filled shock tube 11. The number of shock wave pressure sensors 9 can be set based on the length of the sand-filled shock tube 11 and the simulation requirements. The longer the sand-filled shock tube 11 and the more intensive the simulation monitoring requirements, the greater the number of shock wave pressure sensors 9 to be installed. When the simulation requires monitoring the propagation and attenuation patterns of the pulse wave within the porous medium, at least two shock wave pressure sensors 9 are required.

[0051] The continuous pulse wave generating assembly is connected to the sand-filled shock tube 11 and includes a plurality of pulse wave generators 4 for generating pulse waves and transmitting the pulse waves to the sand-filled shock tube 11 .

[0052] The constant pressure gas source 1 is connected to the pulse wave generator 4 and is used to inflate the pulse wave generator 4 .

[0053] The electromagnetic valve 2 is provided on the pipeline between the constant pressure gas source 1 and the pulse wave generator 4 , corresponds to the pulse wave generator 4 on a one-to-one basis, and is used to adjust the inflation of the corresponding pulse wave generator 4 .

[0054] The controller is used to control the opening and closing of the electromagnetic valve 2 and receive the pulse pressure signal from the shock wave pressure sensor 9.

[0055] The present invention provides a simulation device for the propagation of continuous pulse waves in multiphase media, which has simple equipment, easy operation, and modular upgrade and control. The device aims to evaluate the propagation law of continuous pulse waves in a multiphase medium such as a saturated fluid through an indoor experimental device, and provide a theoretical basis and data support for clarifying the actual propagation law of continuous pulse waves in reservoirs during oil and gas field exploration and development processes such as ultrasonic exploration and wave production.

[0056] Before using this device to simulate the propagation of continuous pulse waves in a multiphase medium, the sand-filled shock tube 11 is first filled with a filling medium to simulate a multiphase medium environment. The various components are then connected and the airtightness of each component is checked. Once these are complete, parameters are set in the controller and the simulation begins. During the simulation, the solenoid valve 2 opens or closes according to the controller's control. When a solenoid valve 2 is opened, the pipeline in which it resides is connected, allowing the gas in the constant-pressure gas source 1 to flow into the pulse wave generator 4 in that pipeline, pressurizing the pulse wave generator 4. When the pressure in the pulse wave generator 4 reaches a certain value, the pulse wave generator 4 releases high-pressure gas, generating a pulse wave that propagates to the sand-filled shock tube 11. At this point, the solenoid valve 2 can be closed by the controller. After the pulse wave propagates to the sand-filled shock tube 11, the shock wave pressure sensor 9 within the sand-filled shock tube 11 monitors the pulse pressure signal within the sand-filled shock tube 11 and transmits this signal to the controller, thereby obtaining quantitative pressure change data for the pulse wave propagating in the multiphase medium. When the controller controls multiple electromagnetic valves 2 to open continuously at a certain time interval, multiple pulse wave generators 4 can generate continuous pulse waves, thereby obtaining quantitative pressure change data of the continuous pulse waves propagating in the multiphase medium, so as to study the propagation law of the pulse waves in the multiphase medium.

[0057] Furthermore, the filling medium includes sand packing and multiphase medium, wherein the sand packing includes no sand packing or quartz sand, and the multiphase medium includes pure air, saturated water, or saturated oil. The filling medium is selected based on specific experimental requirements. In some embodiments, the sand packing permeability and porosity of the filling medium can be designed based on the target reservoir, and the sand packing amount can be calculated.

[0058] Figure 2 FIG. 1 is a schematic structural diagram of a continuous pulse wave generating component provided by an embodiment of the present invention. Figure 2 As shown, the pulse wave generator 4 includes the following structure.

[0059] The inflation and pressure-holding tube 4 - 1 , wherein the first end of the inflation and pressure-holding tube 4 - 1 is connected to the constant-pressure gas source 1 and is used to receive gas from the constant-pressure gas source 1 .

[0060] The inflation and pressure-holding tube sealing end cover 4 - 2 is provided at the second end of the inflation and pressure-holding tube 4 - 1 and is used to seal the second end of the inflation and pressure-holding tube 4 - 1 .

[0061] The second diaphragm 4-3 is provided at the second end of the inflation and pressure holding tube 4-1, and is used for rupturing and releasing high-pressure gas to generate a pulse wave when the pressure in the inflation and pressure holding tube 4-1 reaches a preset pressure threshold.

[0062] When pressure is applied to the pulse wave generator 4, the gas-filled pressure-holding tube 4-1 receives gas and holds the pressure. As the pressure continues to increase, reaching a preset pressure threshold, the second diaphragm 4-3 ruptures, releasing high-pressure gas to generate a pulse wave. During the simulation, continuous pulse waves can be generated by controlling multiple pulse wave generators 4 to hold pressure and then burst. The preset pressure threshold is the pressure resistance of the selected second diaphragm 4-3, for example, 3 MPa.

[0063] Furthermore, the controller is used to perform the following steps.

[0064] Step S101: Control the electromagnetic valves 2 to open in sequence based on a preset time interval and a preset opening number. After each electromagnetic valve 2 is opened, perform the following steps:

[0065] When the second diaphragm 4 - 3 of the pulse wave generator 4 corresponding to the electromagnetic valve 2 ruptures to form a pulse wave, the electromagnetic valve 2 is controlled to close; and the pulse pressure signal of the shock wave pressure sensor 9 is received.

[0066] Step S102: When the shock wave pressure sensor 9 has no data response, stop receiving signals.

[0067] Step S103: drawing a pressure curve diagram based on the received pulse pressure signal of the shock wave pressure sensor 9 to obtain a simulation result of the propagation of the continuous pulse wave in the multiphase medium.

[0068] It is understandable that due to the rupture of the second diaphragm 4-3, the inflation pressure tube 4-1 will no longer be able to maintain pressure. If the solenoid valve 2 remains open at this time, it will affect the pulse pressure signals generated by other pulse wave generators 4. Therefore, when the second diaphragm 4-3 of a pulse wave generator 4 ruptures, the solenoid valve 2 corresponding to this pulse wave generator 4 must be closed to ensure the accuracy of the subsequent pulse pressure signals received.

[0069] Furthermore, the continuous pulse wave generating assembly also includes: a wave propagation tube 6, the first end of the wave propagation tube 6 is connected to the pulse wave generator 4, and the second end of the wave propagation tube 6 is connected to the first end of the sand-filled shock tube 11, which is used to form a propagation channel for the pulse wave from the pulse wave generator 4 to the sand-filled shock tube 11.

[0070] Furthermore, the device further includes: a first end cap 7 having a threaded structure and a rubber gasket, which is used to seal the connection between the wave propagation tube 6 and the sand-filled shock tube 11; and a first diaphragm 8, which is provided at the connection between the wave propagation tube 6 and the sand-filled shock tube 11 and is used to separate the wave propagation tube 6 from the sand-filled shock tube 11. The first diaphragm 8 is a waterproof diaphragm to prevent the fluid in the sand-filled shock tube 11 from entering the wave propagation tube 6 and to prevent the propagation of the pulse wave from being affected.

[0071] Furthermore, the device further includes a pressure sensor monitoring chamber 10, corresponding one-to-one with each shock wave pressure sensor 9 and disposed outside the corresponding shock wave pressure sensor 9, for isolating the shock wave pressure sensor 9 from the filling medium to provide a clean space for the shock wave pressure sensor 9. It should be noted that the pressure sensor monitoring chamber 10 is made of a waterproof filter membrane and does not affect the propagation of the pulse wave.

[0072] Furthermore, the device further includes: a second end cover 12 , which is provided at the second end of the sand-filled shock tube 11 and is used to seal the second end of the sand-filled shock tube 11 .

[0073] Furthermore, the device further includes: an outlet port 14 located on the second end cap 12, for discharging the fluid in the sand-filled shock tube 11; and a filter screen 13 disposed between the second end of the sand-filled shock tube 11 and the outlet port 14, for preventing solids in the sand-filled shock tube 11 from entering the outlet port 14. The filter screen 13 can be a water-resistant filter screen to avoid being affected by the fluid in the sand-filled shock tube 11.

[0074] In some embodiments of the present invention, the above-mentioned apparatus is used to perform simulation, and the following steps S201 to S203 are performed before the simulation to meet the simulation requirements.

[0075] Step S201 : Connect the sand-filled shock tube 11 to the second end cover 12 , and place the filter screen 13 between the sand-filled shock tube 11 and the outlet end 14 .

[0076] The inserted filter screen 13 can be fixed in a variety of ways, for example, by first placing the filter screen 13 on the second end of the sand-filled shock tube 11, and then tightening the second end cover 12 to the second end of the sand-filled shock tube 11 to fix the filter screen. Alternatively, the filter screen 13 can be first cut to a size that matches the second end cover 12 and pre-placed in the second end cover 12, and then tightening the second end cover 12 to the second end of the sand-filled shock tube 11 to fix the filter screen. The present invention is not limited to this.

[0077] Step S202: Based on the target reservoir, the permeability and porosity of the sand filling in the sand-filled shock tube 11 are designed and the amount of sand filling is calculated. A pressure sensor monitoring chamber 10 is buried in the preset pressure measuring position to provide a clean space for the shock wave pressure sensor 9 to monitor the pressure. The pressure sensor monitoring chamber 10 and the shock wave pressure sensor 9 can be fixed by screws or other means. Gravel is filled into the sand-filled shock tube 11 and compacted. According to the preset experiment, the fluid (including but not limited to one or more of gas, water, and crude oil) is saturated inside the sand-filled shock tube 11. For example, the propagation of the simulated pulse wave in the water-solid two-phase fluid is saturated with water, and the propagation of the simulated pulse wave in the oil-solid two-phase fluid is saturated with oil.

[0078] Specifically, when filling gravel into the sand-filled shock tube 11, fill and compact it from the first end of the sand-filled shock tube 11. When saturating the fluid, first place the sand-filled shock tube 11 vertically with the second end at the bottom, and the outlet end 14 is in a closed state; then add fluid to the first end until the fluid overflows, then open the outlet end 14 and allow the fluid to slowly flow out from the outlet end 14; continue to add fluid to the first end to form a fluid flow in the sand-filled shock tube 11, and the saturation is more complete; after the saturation of the fluid is completed, close the outlet end 14, and use the first end cover 7 and the first diaphragm 8 to physically seal the second end.

[0079] In addition, if a multiphase medium is replaced, for example, saturated water is replaced with saturated oil, the sand-filled shock tube 11 can be placed vertically with the second end at the bottom, and the outlet end 14 can be opened, and then oil can be added from the first end to achieve the process of the oil expelling the water from the sand-filled shock tube 11.

[0080] Step S203: According to Figure 1 Connect the device and verify the airtightness. If the airtightness meets the requirements, you can start the simulation.

[0081] After a simulation is complete, the device can be disassembled, the filling medium inside the sand-filled shock tube 11 and the second diaphragm 4-3 can be replaced, and the next simulation can be carried out. After all simulations are completed, the device is disassembled and cleaned. When cleaning the sand-filled shock tube 11, the outlet port 14 can be opened to release the pressure and drain the fluid inside the sand-filled shock tube 11, making it easier to disassemble and clean.

[0082] Figure 3 It is a flow chart of a method for simulating the propagation of a continuous pulse wave in a multiphase medium provided by an embodiment of the present invention. The method is based on any one of the above-mentioned devices for simulation, and the method includes the following steps S101 to S103.

[0083] Step S101: Control the electromagnetic valves 2 to open in sequence based on a preset time interval and a preset opening number. After each electromagnetic valve 2 is opened, perform the following steps:

[0084] When the second diaphragm 4 - 3 of the pulse wave generator 4 corresponding to the electromagnetic valve 2 ruptures to form a pulse wave, the electromagnetic valve 2 is controlled to close; and the pulse pressure signal of the shock wave pressure sensor 9 is received.

[0085] Step S102: When the shock wave pressure sensor 9 has no data response, stop receiving signals.

[0086] Step S103: drawing a pressure curve diagram based on the received pulse pressure signal of the shock wave pressure sensor 9 to obtain a simulation result of the propagation of the continuous pulse wave in the multiphase medium.

[0087] This method is executed by the controller. For specific implementation, please refer to Figure 1 The electromagnetic valves 2 can be opened in sequence according to a preset time interval and a preset opening number by means of the electromagnetic valve controller 3 through the control software of the computer 5 .

[0088] Furthermore, the method further includes: comparing and analyzing pressure curves obtained under different simulation parameters to obtain difference analysis results of the pulse wave propagation law under different simulation parameters. The simulation parameters include the type of the filling medium, the preset time interval, the preset number of openings, the pressure resistance value of the second diaphragm 4-3, and the temperature.

[0089] Example 1:

[0090] The operation process of this embodiment is as follows: (1) pre-filling the sand-filled shock tube; (2) connecting the device; (3) exciting the continuous pulse wave; (4) real-time monitoring and recording of the shock wave pressure sensor data; (5) data processing and analysis; (6) replacing the sand-filled shock tube medium or the continuous pulse wave generating component, and repeating the above steps to clarify the influence of different factors.

[0091] In this embodiment, five simulations were performed, wherein the inner diameter of the sand-filled shock tube was 10 cm, the outer diameter was 11 cm, and the pressure resistance of the second diaphragm was 3 MPa. The continuous pulse wave generating assembly is provided with at least four pulse wave generators.

[0092] It should also be noted that when the temperature rises, the propagation speed of the wave will increase. In this embodiment, the temperature setting can be based on the temperature of the target reservoir, and the existing temperature adjustment device is used for temperature adjustment in the simulation experiment.

[0093] Specific parameters are shown in Table 1. The pressure measurement point locations can be adjusted within a certain range. For example, a 10cm adjustment range can be reserved, and the 2m point can actually be set between 1.9m and 2m. The number of pulse wave transmitters, or the preset number of pulse wave transmitters, can be adjusted based on the simulation requirements and the total number of pulse wave transmitters. The continuous excitation pulse wave frequency is determined by the preset time interval. For example, a setting of 0.1s results in a continuous excitation pulse wave frequency of 10Hz.

[0094] Table 1 Simulation parameters of continuous pulse wave propagation in multiphase media

[0095]

[0096] Group 1:

[0097] Step 1: Connect the second end cap 12 of the sand-filled shock tube 11 and place the filter 13 between the sand-filled shock tube 11 and the outlet end 14 .

[0098] Step 2: No pre-filling treatment is performed in the sand-filled shock tube 11 , and a shock wave pressure sensor 9 is connected at 1 m and 2 m of the sand-filled shock tube 11 respectively.

[0099] Step 3: Follow Figure 1 Connect the unit and verify airtightness.

[0100] Step 4: Using the control software on computer 5 and the solenoid valve controller 3, open the solenoid valve 2 corresponding to the first pulse wave generator, continuously filling and holding the pressure in the pulse wave generator's inflation and pressure-holding tube 4-1. When the pressure-bearing capacity of the first pulse wave generator's second diaphragm 4-3 reaches its upper limit, the diaphragm ruptures, releasing high-pressure gas to form a high-pressure pulse wave. At this point, the solenoid valve 2 immediately closes.

[0101] Step 5: Use the shock wave pressure sensor 9 to monitor and obtain the pulse wave pressure signal in the sand-filled shock tube 11 in real time.

[0102] Step 6: Stop the experiment when the shock wave pressure sensor 9 has no data response.

[0103] Group 2:

[0104] After the first set of experiments, we will continue to carry out:

[0105] Step 1: Using computer 5 control software and electromagnetic valve controller 3, the corresponding electromagnetic valves 2 of the second, third, and fourth pulse wave generators are sequentially opened at set intervals (0.1s), continuously filling and holding the pressure in the respective pulse wave generator inflation and pressure-holding tubes with gas. When the pressure-bearing capacity of the second diaphragms 4-3 of the second, third, and fourth pulse wave generators reaches the upper pressure limit, the diaphragms rupture in sequence, releasing high-pressure gas to form a high-pressure pulse wave, and the corresponding electromagnetic valves immediately close. At this point, three consecutive shock waves are generated at a frequency of 10 Hz and enter the sand-filled shock wave tube 11.

[0106] Step 2: Use the shock wave pressure sensor 9 to monitor and obtain the pulse wave pressure signal in the sand-filled shock wave tube 11 in real time.

[0107] Step 3: When the shock wave pressure sensor 9 has no data response, stop the experiment and disassemble the device.

[0108] Group 3:

[0109] Step 1: Connect the second end cap 12 of the sand-filled shock tube 11 and place a filter 13 between the sand-filled shock tube 11 and the outlet 14 to prevent sand particles in the shock tube from entering the outlet 14 .

[0110] Step 2: Based on the target reservoir, the sand-filled shock tube 11 is designed with a permeability of approximately 2D and a porosity of approximately 35%. The sand filling volume is calculated. A pressure sensor monitoring chamber 10 and a shock wave pressure sensor 9 are embedded at 1m and 2m, respectively, into the sand-filled shock tube 11. No saturated fluid treatment is performed within the sand-filled shock tube 11; that is, the interior is in a saturated gas state.

[0111] Step 3: Follow Figure 1 Connect the unit and verify airtightness.

[0112] Step 4: Using computer 5 control software and electromagnetic valve controller 3, open electromagnetic valve 2 corresponding to the first pulse wave generator, continuously filling the pulse wave generator's inflation and pressure-holding tube with gas and holding the pressure. When the pressure-bearing capacity of the first pulse wave generator's second diaphragm 4-3 reaches its upper limit, the diaphragm ruptures, releasing high-pressure gas to form a high-pressure pulse wave, and electromagnetic valve 2 immediately closes.

[0113] Step 5: Use the shock wave pressure sensor 9 to monitor and obtain the pulse wave pressure signal in the sand-filled shock tube 11 in real time.

[0114] Step 6: When the shock wave pressure sensor 9 has no data response, stop the experiment, disassemble the device, and clean the experimental equipment.

[0115] Group 4:

[0116] After the third group of experiments, we will continue to carry out the following:

[0117] Step 1: Using computer 5 control software and electromagnetic valve controller 3, the corresponding electromagnetic valves 2 of the second, third, and fourth pulse wave generators are sequentially opened at set intervals (0.1s), continuously filling and holding the pressure in the respective pulse wave generator inflation and pressure-holding tubes with gas. When the pressure-bearing capacity of the second diaphragms 4-3 of the second, third, and fourth pulse wave generators reaches the upper pressure limit, the diaphragms rupture in sequence, releasing high-pressure gas to form a high-pressure pulse wave, and the corresponding electromagnetic valves immediately close. At this point, three consecutive shock waves are generated at a frequency of 10 Hz and enter the sand-filled shock wave tube 11.

[0118] Step 2: Use the shock wave pressure sensor 9 to monitor and obtain the pulse wave pressure signal in the sand-filled shock wave tube 11 in real time.

[0119] Step 3: When the shock wave pressure sensor 9 has no data response, stop the experiment, disassemble the device, and clean the experimental equipment.

[0120] Group 5:

[0121] Step 1: Connect the second end cap 12 of the sand-filled shock tube 11 and place a filter 13 between the sand-filled shock tube 11 and the outlet 14 to prevent sand particles in the shock tube from entering the outlet 14 .

[0122] Step 2: Based on the target reservoir, the sand-filled shock tube 11 is designed with a permeability of approximately 2D and a porosity of approximately 35%. The sand filling volume is calculated. A pressure sensor monitoring chamber 10 and a shock wave pressure sensor 9 are embedded at 1m and 2m, respectively, into the sand-filled shock tube 11. The sand-filled shock tube 11 is saturated with water, achieving a water saturation of over 99%, effectively saturating the interior with water.

[0123] Step 3: Follow Figure 1 Connect the unit and verify airtightness.

[0124] Step 4: Using computer 5 control software and electromagnetic valve controller 3, the electromagnetic valves 2 corresponding to the first, second, and third pulse wave generators are sequentially opened at set intervals (0.1s), continuously filling and holding the pressure in the respective pulse wave generator inflation and pressure-holding tubes. When the pressure-bearing capacity of the second diaphragms 4-3 of the first, second, and third pulse wave generators reaches the upper pressure limit, the diaphragms rupture in sequence, releasing high-pressure gas to form a high-pressure pulse wave, and the corresponding electromagnetic valves immediately close. At this point, three consecutive shock waves are generated at a frequency of 10Hz and enter the sand-filled shock wave tube 11.

[0125] Step 5: Use the shock wave pressure sensor 9 to monitor and obtain the pulse wave pressure signal in the sand-filled shock tube 11 in real time.

[0126] Step 6: When the shock wave pressure sensor 9 has no data response, stop the experiment, disassemble the device, and clean the experimental equipment.

[0127] After the completion of the above five groups of simulation experiments, the monitored and recorded pulse wave pressure signals were plotted into curves to conduct comparative analysis on the propagation laws of pulse waves in multiphase media under different simulation parameters: (1) By comparing the first and second groups, the propagation laws of continuous excitation pulse waves in air can be clarified (the first group is equivalent to the control experiment of shock wave propagation laws monitored by conventional shock tube); (2) By comparing the first and third groups, the propagation laws of single pulse waves in sand-filled porous media can be compared separately with the differences in their propagation laws in pure gas media; (3) By comparing the second and fourth groups, the propagation laws of continuous pulse waves in porous media can be clarified; (4) By comparing the fourth and fifth groups, the differences in the propagation laws of continuous pulse waves in gas-solid two-phase and liquid-solid two-phase can be clarified.

[0128] Figure 4 is a schematic diagram of pressure curves at two pressure measuring points in the first set of simulation experiments provided by an embodiment of the present invention. Figure 5 is a schematic diagram of pressure curves at two pressure measuring points in the second set of simulation experiments provided by an embodiment of the present invention, Figure 6 is a schematic diagram of pressure curves at two pressure measuring points in the third set of simulation experiments provided by an embodiment of the present invention, Figure 7 1 is a schematic diagram of pressure curves at two pressure measuring points in the fourth set of simulation experiments provided by an embodiment of the present invention. Figure 8 This is a schematic diagram of the pressure curves at two pressure measuring points in the fifth set of simulation experiments provided by the embodiment of the present invention. Figures 4 to 8 , it can be found that the pressure curve fluctuates more violently, the pressure curve reaches the peak faster, but decays more slowly. Among them, the results of the first group are similar to the existing research results, such as (1) Cheng Shuai, Tong Nianxue, Liu Wenxiang, et al. Control method of shock wave attenuation process of shock tube based on explosion wave simulation driven by high-pressure gas [J]. Explosion and Shock Wave, 2024, 44(05): 74-80, (2) Song Yuhan, Chen Xiangfeng, Yang Xinyu, et al. Influence of rupture mechanism of explosion fragments in explosion shock tube on shock wave propagation characteristics [J]. Journal of Tsinghua University (Science and Technology), 2025, 65(01): 152-164, which also proves the reliability of the simulation data of this invention. Through comparative analysis, the following analysis results are obtained: (1) By comparing the first and second groups, it can be found that there is a superposition effect of fluctuations in the three continuous excitation waves; (2) By comparing the first and third groups, it can be found that the excitation waves in the sand-filled shock tube mainly propagate from solids and gases, and the time of receiving the pressure signal is advanced. This is because the wave propagates faster in the solid; (3) By comparing the second and fourth groups, it can be seen that there is still a superposition effect in the continuous excitation waves in the sand-filled shock tube, but the superposition peak value change is significantly lower than that of the second group, but the pressure curve as a whole remains at a high level; (4) By comparing the fourth and fifth groups, it can be seen that the propagation and attenuation speed of waves in the saturated water porous medium is faster, and the superposition effect of continuous excitation waves also exists.

[0129] The present invention addresses the problems of the existing shock tube experimental device and method for evaluating the propagation law of pulse waves, such as the inability to evaluate the propagation law of continuous pulse waves and the inability to evaluate the propagation law in porous media and multiphase media. By establishing a continuous pulse wave generating component to excite continuous pulse waves and a sand-filled shock tube to simulate a porous medium with saturated fluid, and combining the two for application, the evaluation of the propagation law of continuous pulse waves in multiphase media is achieved, providing indoor experimental support for oil and gas seismic, ultrasonic exploration and wave development.

[0130] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0131] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0132] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0133] In a typical configuration, a computing device includes one or more processors (CPUs), input / output interfaces, network interfaces, and memory.

[0134] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0135] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can be implemented using any method or technology for information storage. Information can be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to, phase-change RAM (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassettes, magnetic disk storage or other magnetic storage devices, or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable media does not include transitory computer-readable media, such as modulated data signals and carrier waves.

[0136] It should also be noted that the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, commodity, or apparatus that includes a series of elements includes not only those elements but also other elements not explicitly listed, or includes elements inherent to such process, method, commodity, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a ..." does not exclude the presence of other identical elements in the process, method, commodity, or apparatus that includes the element.

[0137] The above are merely embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should all be included within the scope of the claims of the present application.

Claims

1. A device for simulating the propagation of continuous pulse waves in a multiphase medium, characterized in that: The device comprises: A sand-filled shock tube (11) having a filling medium therein for simulating a multiphase medium environment; A plurality of shock wave pressure sensors (9) are respectively arranged at preset pressure measuring positions in the sand-filled shock wave tube (11) and are used to monitor the pulse pressure signal in the sand-filled shock wave tube (11); a continuous pulse wave generating assembly connected to the sand-filled shock wave tube (11), comprising a plurality of pulse wave generators (4) for generating pulse waves and transmitting the pulse waves to the sand-filled shock wave tube (11); a constant pressure gas source (1), connected to the pulse wave generator (4), and used to inflate the pulse wave generator (4); an electromagnetic valve (2), arranged on a pipeline between the constant pressure gas source (1) and the pulse wave generator (4), corresponding one to one with the pulse wave generator (4), and used for regulating the inflation of the corresponding pulse wave generator (4); A controller is used to control the opening and closing of the electromagnetic valve (2) and to receive the pulse pressure signal from the shock wave pressure sensor (9).

2. The device according to claim 1, characterized in that The filling medium includes sand filling and multiphase medium, wherein the sand filling includes no sand filling or quartz sand, and the multiphase medium includes pure air, saturated water or saturated oil.

3. The device according to claim 1, characterized in that The pulse wave generator (4) comprises: an inflation and pressure-holding tube (4-1), wherein a first end of the inflation and pressure-holding tube (4-1) is connected to the constant-pressure gas source (1) and is used to receive gas from the constant-pressure gas source (1); An air-inflating and pressure-holding tube sealing end cover (4-2) is provided at the second end of the air-inflating and pressure-holding tube (4-1) and is used to seal the second end of the air-inflating and pressure-holding tube (4-1); The second diaphragm (4-3) is arranged at the second end of the inflation pressure holding tube (4-1) and is used for rupturing and releasing high-pressure gas to generate a pulse wave when the pressure in the inflation pressure holding tube (4-1) reaches a preset pressure threshold.

4. The device according to claim 3, characterized in that The controller is configured to perform the following operations: The electromagnetic valves (2) are controlled to open in sequence based on a preset time interval and a preset opening number. After each electromagnetic valve (2) is opened, the following steps are performed: When the second diaphragm (4-3) of the pulse wave generator (4) corresponding to the electromagnetic valve (2) ruptures to form a pulse wave, the electromagnetic valve (2) is controlled to close; receiving a pulse pressure signal from the shock wave pressure sensor (9); When the shock wave pressure sensor (9) has no data response, stop receiving signals; A pressure curve is drawn based on the pulse pressure signal received from the shock wave pressure sensor (9), and a simulation result of the propagation of a continuous pulse wave in a multiphase medium is obtained.

5. The device according to claim 1, characterized in that The continuous pulse wave generating component also includes: A wave propagation tube (6), wherein a first end of the wave propagation tube (6) is connected to the pulse wave generator (4), and a second end of the wave propagation tube (6) is connected to a first end of the sand-filled shock wave tube (11), for forming a propagation channel for the pulse wave from the pulse wave generator (4) to the sand-filled shock wave tube (11).

6. The device according to claim 5, characterized in that The device further comprises: A first end cap (7) having a threaded structure and provided with a rubber gasket for sealingly connecting the wave propagation tube (6) and the sand-filled shock tube (11); A first diaphragm (8) is provided at the connection between the wave propagation tube (6) and the sand-filled shock tube (11) and is used to separate the wave propagation tube (6) from the sand-filled shock tube (11).

7. The device according to claim 1, characterized in that The device further comprises: A pressure sensor monitoring chamber (10) corresponds one-to-one to the shock wave pressure sensor (9), is arranged outside the corresponding shock wave pressure sensor (9), and is used to separate the shock wave pressure sensor (9) from the filling medium to provide a clean space for the shock wave pressure sensor (9).

8. The device according to claim 1, characterized in that The device further comprises: A second end cap (12) is provided at the second end of the sand-filled shock tube (11) and is used to seal the second end of the sand-filled shock tube (11).

9. The device according to claim 8, characterized in that The device further comprises: An outlet end (14), located on the second end cover (12), is used to discharge the fluid in the sand-filled shock tube (11); A filter screen (13) is provided between the second end of the sand-filled shock tube (11) and the outlet end (14), and is used to prevent solids in the sand-filled shock tube (11) from entering the outlet end (14).

10. A method for simulating the propagation of continuous pulse waves in a multiphase medium, characterized in that: The method is based on the simulation of the device according to claim 3, and the method includes: The electromagnetic valves (2) are controlled to open in sequence based on a preset time interval and a preset opening number. After each electromagnetic valve (2) is opened, the following steps are performed: When the second diaphragm (4-3) of the pulse wave generator (4) corresponding to the electromagnetic valve (2) ruptures to form a pulse wave, the electromagnetic valve (2) is controlled to close; receiving a pulse pressure signal from the shock wave pressure sensor (9); When the shock wave pressure sensor (9) has no data response, stop receiving signals; A pressure curve is drawn based on the pulse pressure signal received from the shock wave pressure sensor (9), and a simulation result of the propagation of a continuous pulse wave in a multiphase medium is obtained.

11. The method according to claim 10, characterized in that The method further comprises: The pressure curves obtained under different simulation parameters were compared and analyzed to obtain the difference analysis results of the pulse wave propagation law under different simulation parameters. The simulation parameters include the type of the filling medium, the preset time interval, the preset opening quantity, the withstand voltage value of the second diaphragm (4-3), and the temperature.

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