Simulation device and method for propagation of continuous pulse waves in multiphase medium

Abstract

The embodiment of the invention provides a simulation device and method for propagation of continuous pulse waves in a multiphase medium, and relates to the technical field of oil and gas field exploration and development. The device comprises a sand-filled shock tube which is filled with a filling medium and is used for simulating a multiphase medium environment; the shock wave pressure sensors are used for monitoring pulse pressure signals in the sand-filled shock wave tube; the continuous pulse wave generation assembly comprises a plurality of pulse wave generators and is used for generating pulse waves and spreading the pulse waves to the sand-filled shock tube; the constant-pressure air source is used for inflating the pulse wave generator; the electromagnetic valves are used for adjusting inflation of the corresponding pulse wave generators; the controller is used for controlling opening and closing of the electromagnetic valve and receiving pulse pressure signals of the shock wave pressure sensor. The device overcomes the defect that the propagation rule of the continuous pulse waves in the multiphase medium cannot be simulated in the prior art by acquiring quantitative pressure change data of the continuous pulse waves propagating in the multiphase medium.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas field exploration and development, and particularly relates to an apparatus and method for simulating the propagation of continuous pulse waves in multiphase media. Background Art

[0002] As the development of conventional oil and gas resources enters the middle and late stages, further strengthening the exploration and development of unconventional reservoirs is the key to ensuring energy security. Transmitting and receiving wave signals into the reservoir and inversely calculating the physical properties of the reservoir through waveform monitoring is the most commonly used oil and gas exploration technology. In addition, wave-based enhanced oil recovery has also been proven to be a clean oil and gas field development technology. The applied excitation wave can generate an additional pressure gradient at the pore throats, promoting the flow of fluids through the pore throats and ultimately achieving the effect of expanding the swept volume.

[0003] The propagation and attenuation laws of waves in multiphase media such as oil, gas, water, and rock in the reservoir are the key to distinguishing each phase medium and rock types. Currently, the research on wave propagation in porous media mainly focuses on numerical simulations of wave fields, such as CN119781031A, CN119884608A, CN114861415A, CN119808449A, CN114779325A, and CN112987088A, etc. The research on physical models mainly produces physical models through indoor similarity theory. Although there are also technologies that can simulate the propagation of waves in fluid-saturated porous media, such as CN115966129A, this technology only conducts qualitative research and cannot monitor the quantitative pressure change law.

[0004] A shock tube is a device that uses gas to be compressed in a geometrically restricted pipe and burst and expand when the ultimate pressure is reached, thereby generating a shock wave. The shock tube, combined with a shock wave monitoring sensor, can quantitatively obtain the pressure propagation law of the shock wave, thus solving the above problems. However, currently, the application of shock tubes mainly studies the propagation and attenuation laws of shock waves in air, and the shock wave occurs only once and cannot simulate the generation of pulse waves, such as CN119649783A, CN117470038A, CN117074467A, and CN113777213A, etc.

[0005] Prior Art 1: A Chinese invention patent application with the publication number CN119043631A applied by the National University of Defense Technology of the Chinese People's Liberation Army in 2024. This patent application provides a test device and method for simulating the propagation law and wave elimination efficiency of shock waves in a wave elimination 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 elimination chamber to be tested. Shock wave pressure sensors are respectively installed at positions on the input detection section and the output detection section close to the first test section and on the first test section for testing the shock wave parameters at each characteristic position. This patent application can test and obtain the propagation law and wave elimination efficiency of shock waves passing through various simulated wave elimination chambers, is easy to implement, and has strong versatility. However, this patent application has the following problems: (1) It mainly monitors and simply tests the maximum wave intensity of the shock wave before and after passing through the wave elimination chamber to calculate the wave elimination rate, and cannot evaluate the propagation law of the pulse wave; (2) It cannot simulate the excitation process of continuous pulse waves; (3) It cannot simulate the propagation law of pulse waves in multi-phase media.

[0006] Prior Art 2: A Chinese invention patent application with the publication number CN113848392A applied by Xidian University in 2021. This patent application provides a measurement device and test method for the propagation characteristics of multi-frequency low-frequency electromagnetic waves based on a shock tube. This device uses a low-frequency electromagnetic composite probe to sense multi-frequency low-frequency electromagnetic wave signals under the influence of plasma, outputs low-frequency electric field signals and low-frequency magnetic field signals, and the multi-frequency receiving and measuring device obtains the propagation characteristics of multi-frequency low-frequency electromagnetic waves by processing waveform data; uses a multi-frequency transmitting device to generate and radiate multi-frequency low-frequency electromagnetic wave signals outward. This patent application realizes the simultaneous measurement of the electric field component and magnetic field component of multi-frequency low-frequency electromagnetic waves at the same position based on an improved shock tube, improves the consistency of the test conditions for shock wave plasma parameters, and improves the measurement efficiency of shock tube experiments. However, this patent application has the following problems: (1) This device combines a multi-frequency generating device for generating electromagnetic waves and an ignition device for generating shock waves. Its essence is to use the shock wave excited by the shock tube to form a wrapped plasma around the low-frequency electromagnetic composite probe, aiming to use the low-frequency electromagnetic composite probe to sense the influence of plasma on the low-frequency electromagnetic waves generated by the multi-frequency generating device. This device cannot study the propagation law of the wave excited by the shock tube.

[0007] (2) This device also does not consider the study of the propagation law of pulse waves in multi-phase media.

[0008] Therefore, there is an urgent need to develop a device to solve the above problems existing in the prior art. Summary of the Invention

[0009] The objective of the embodiments of the present invention is to provide an analog device and method for the propagation of continuous pulse waves in multiphase media, so as to solve at least one problem existing in the prior art.

[0010] To achieve the above objective, in a first aspect, the embodiments of the present invention provide an analog device for the propagation of continuous pulse waves in multiphase media. The device includes: a sand-filled shock tube, which is filled with a filling medium inside and is used to simulate a multiphase medium environment; a plurality of shock wave pressure sensors, which are respectively arranged at preset pressure measurement positions inside the sand-filled shock tube and are used to monitor the pulse pressure signals inside the sand-filled shock tube; a continuous pulse wave generating assembly, which is connected to the sand-filled shock tube and includes a plurality of pulse wave generators for generating pulse waves and propagating them to the sand-filled shock tube; a constant pressure gas source, which is connected to the pulse wave generators and is used to inflate the pulse wave generators; electromagnetic valves, which are arranged on the pipelines between the constant pressure gas source and the pulse wave generators, corresponding to the pulse wave generators one by one, and are used to adjust the inflation of the corresponding pulse wave generators; and a controller, which is used to control the opening and closing of the electromagnetic valves and receive the pulse pressure signals from the shock wave pressure sensors.

[0011] Optionally, the filling medium includes sand filling and multiphase media. Among them, the sand filling includes no sand filling or quartz sand, and the multiphase media includes pure air, saturated water or saturated oil.

[0012] Optionally, the pulse wave generator includes: an inflation and pressure-holding tube, the first end of which is connected to the constant pressure gas source and is used to receive the gas from the constant pressure gas source; an inflation and pressure-holding tube sealing end cap, which is arranged at the second end of the inflation and pressure-holding tube and is used to seal the second end of the inflation and pressure-holding tube; and a second diaphragm, which is arranged at the second end of the inflation and pressure-holding tube and is used to rupture and release high-pressure gas to generate a pulse wave when the pressure inside the inflation and pressure-holding tube reaches a preset pressure threshold.

[0013] Optionally, the controller is used to perform the following operations: control the electromagnetic valves to open in sequence based on a preset time interval and a preset number of openings. After each electromagnetic valve is opened, perform the following steps: when the second diaphragm of the pulse wave generator corresponding to the electromagnetic valve ruptures to form a pulse wave, control the electromagnetic valve to close; receive the pulse pressure signals from the shock wave pressure sensors; when there is no data response from the shock wave pressure sensors, stop receiving signals; and draw a pressure curve graph based on the received pulse pressure signals from the shock wave pressure sensors to obtain the simulation results of the propagation of continuous pulse waves in multiphase media.

[0014] Optionally, the continuous pulse wave generating assembly further 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.

[0015] Optionally, the device further includes: a first end cap, adopting a threaded structure and provided with a rubber gasket, for hermetically connecting the wave propagation tube and the sand-filled shock tube; a first diaphragm, disposed at the connection of the wave propagation tube and the sand-filled shock tube, for separating the wave propagation tube and the sand-filled shock tube.

[0016] Optionally, the device further includes: a pressure sensor monitoring chamber, corresponding to the shock wave pressure sensor one by one, disposed outside the corresponding shock wave pressure sensor, for separating the shock wave pressure sensor from the filling medium, so as to provide a clean space for the shock wave pressure sensor.

[0017] Optionally, the device further includes: a second end cap, disposed at the second end of the sand-filled shock tube, for sealing the second end of the sand-filled shock tube.

[0018] Optionally, the device further includes: an outlet end, located on the second end cap, for discharging the fluid in the sand-filled shock tube; a filter screen, disposed between the second end of the sand-filled shock tube and the outlet end, for preventing the solids in the sand-filled shock tube from entering the outlet end.

[0019] 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 any one of the above-mentioned devices for simulation. The method includes: controlling the electromagnetic valves to be opened in sequence based on a preset time interval and a preset number of openings. After each electromagnetic valve is opened, the following steps are executed: when a pulse wave is formed after the rupture of the second diaphragm of the pulse wave generator corresponding to the electromagnetic valve, controlling the electromagnetic valve to close; receiving the pulse pressure signal of the shock wave pressure sensor; when there is no data response from the shock wave pressure sensor, stopping receiving the signal; drawing a pressure curve graph based on the received pulse pressure signal of the shock wave pressure sensor to obtain the simulation result of the propagation of continuous pulse waves in a multiphase medium.

[0020] Optionally, the method further includes: comparing and analyzing the pressure curve graphs obtained under different simulation parameters to obtain the difference analysis result of the pulse wave propagation law under different simulation parameters, where 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, and the temperature.

[0021] Through the above technical solution, a filling medium can be prepared in a sand-filled shock tube to simulate a multiphase medium environment, so as to simulate the propagation law of pulse waves in a multiphase medium. The continuous pulse wave generating assembly includes a plurality of pulse wave generators. By using a controller to control a plurality of electromagnetic valves to be continuously opened at a certain time interval, a plurality of pulse wave generators can generate continuous pulse waves, so as to simulate the excitation process of continuous pulse waves. A shock wave pressure sensor is arranged 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, so as to obtain the quantitative pressure change data of the pulse wave propagating in the multiphase medium, overcoming the defect that the prior art cannot simulate the propagation law of continuous pulse waves in a multiphase medium. In addition, the design principle of the present invention is reliable, the structure is simple, and it has a very wide application prospect, which is of great significance to promoting oil and gas exploration and development.

[0022] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent specific implementation part. Brief Description of the Drawings

[0023] The 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 specific implementation manners, they are used to explain the embodiments of the present invention, but do not constitute a limitation to the embodiments of the present invention. In the drawings: Figure 1 is a schematic structural diagram of a simulation device for the propagation of continuous pulse waves in a multiphase medium provided by an embodiment of the present invention; Figure 2 is a schematic structural diagram of a continuous pulse wave generating assembly provided by an embodiment of the present invention; Figure 3 is a schematic flowchart of a simulation method for the propagation of continuous pulse waves in a multiphase medium provided by an embodiment of the present invention; Figure 4 is a schematic diagram of pressure curves at two pressure measurement points in the first group of simulation experiments provided by an embodiment of the present invention; Figure 5 is a schematic diagram of pressure curves at two pressure measurement points in the second group of simulation experiments provided by an embodiment of the present invention; Figure 6 is a schematic diagram of pressure curves at two pressure measurement points in the third group of simulation experiments provided by an embodiment of the present invention; Figure 7 is a schematic diagram of pressure curves at two pressure measurement points in the fourth group of simulation experiments provided by an embodiment of the present invention; Figure 8 is a schematic diagram of pressure curves at two pressure measurement points in the fifth group of simulation experiments provided by an embodiment of the present invention.

[0024] Description of the Reference Numerals 1 Constant pressure gas source 2 Electromagnetic valve 3 Electromagnetic valve controller 4 Pulse wave generator 5 Computer 6 Wave propagation tube 7 First end cap 8 First diaphragm 9 Shock wave pressure sensor 10 Pressure sensor monitoring chamber 11 Sand-filled shock tube 12 Second end cap 13 Filter screen 14 Outlet end 4-1 Inflatable pressure-holding tube 4-2 Sealing end cap of inflatable pressure-holding tube 4-3 Second diaphragm Specific implementation manners The following will detail the specific implementation manners of the embodiments of the present invention in conjunction with the accompanying drawings. It should be understood that the specific implementation manners described herein are only for explaining and illustrating the embodiments of the present invention, and are not used to limit the embodiments of the present invention.

[0025] It should be noted that the acquisition, transmission, storage, use, processing, etc. of data in the technical solution of this application all comply with the relevant regulations of laws and regulations. In the embodiments of this application, some industry-existing solutions such as certain software, components, models, etc. may be mentioned. They should be regarded as exemplary, and their purpose is only to illustrate the feasibility in the implementation of the technical solution of this application, but it does not mean that the applicant has already or necessarily used this solution.

[0026] Figure 1 It is a schematic structural diagram of an analog device for the propagation of continuous pulse waves in a multiphase medium provided by the embodiments of the present invention. As Figure 1 shown, the device includes the following structures.

[0027] A sand-filled shock tube 11, which is filled with a filling medium inside and is used to simulate a multiphase medium environment, and its length can be set according to actual needs.

[0028] Multiple shock wave pressure sensors 9, which are respectively arranged at preset pressure measurement positions inside the sand-filled shock tube 11 and are used to monitor the pulse pressure signals inside the sand-filled shock tube 11. Their quantity can be set based on the length of the sand-filled shock tube 11 and the simulation requirements. The longer the length of the sand-filled shock tube 11 and the denser the data required to be monitored by the simulation, the more the quantity set. When simulating the propagation and attenuation variation laws of pulse waves in porous media, at least two need to be set.

[0029] A continuous pulse wave generating assembly, which is connected to the sand-filled shock tube 11 and includes multiple pulse wave generators 4, and is used to generate pulse waves and propagate them to the sand-filled shock tube 11.

[0030] A constant pressure gas source 1, which is connected to the pulse wave generator 4 and is used to inflate the pulse wave generator 4.

[0031] The electromagnetic valve 2 is arranged on the pipeline between the constant pressure gas source 1 and the pulse wave generator 4, corresponds to the pulse wave generator 4 one by one, and is used to adjust the inflation of the corresponding pulse wave generator 4.

[0032] The controller is used to control the opening and closing of the electromagnetic valve 2 and receive the pulse pressure signal of the shock wave pressure sensor 9.

[0033] 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 controllable. The purpose is to evaluate the propagation law of continuous pulse waves in a multiphase medium such as a saturated fluid through an indoor experimental device, so as to provide a theoretical basis and data support for clarifying the real propagation law of continuous pulse waves in reservoirs during the exploration and development of oil and gas fields such as ultrasonic exploration and wave production.

[0034] Before using the device to simulate the propagation of continuous pulse waves in multiphase media, first fill the sand-filled shock tube 11 with filling medium to simulate the multiphase medium environment; then connect the various structures and check the air tightness of each part; after checking, set the parameters in the controller and start the simulation. During the simulation, the electromagnetic valve 2 is opened or closed according to the control of the controller. When a certain electromagnetic valve 2 is opened, the pipeline where the electromagnetic valve 2 is located is connected, so that the gas in the constant pressure gas source 1 passes into the pulse wave generator 4 of the pipeline to pressurize the pulse wave generator 4. When the pressure of the pulse wave generator 4 reaches a certain value, the pulse wave generator 4 releases high-pressure gas, generates a pulse wave and propagates to the sand-filled shock tube 11. At this time, the electromagnetic 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 in the sand-filled shock tube 11 can monitor the pulse pressure signal in the sand-filled shock tube 11 and transmit the signal to the controller, thereby obtaining quantitative pressure change data of 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, so as to obtain quantitative pressure change data of continuous pulse waves propagating in multiphase media, so as to study the propagation law of pulse waves in multiphase media.

[0035] Further, 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. The filling medium is selected according to specific experimental requirements. In some embodiments, the sand filling permeability and porosity of the filling medium can be designed based on the target reservoir and the sand filling amount can be calculated.

[0036] Figure 2 is a schematic diagram of the structure of a continuous pulse wave generating component provided by an embodiment of the present invention, such as Figure 2 As shown, the pulse wave generator 4 includes the following structure.

[0037] The gas-filled pressure-holding tube 4-1, the first end of the gas-filled pressure-holding tube 4-1 is connected to the constant-pressure gas source 1 for receiving the gas from the constant-pressure gas source 1.

[0038] The gas-filled pressure-holding tube sealing end cap 4-2 is arranged at the second end of the gas-filled pressure-holding tube 4-1 for sealing the second end of the gas-filled pressure-holding tube 4-1.

[0039] The second diaphragm 4-3 is arranged at the second end of the gas-filled pressure-holding tube 4-1 for rupturing and releasing high-pressure gas to generate a pulse wave when the pressure in the gas-filled pressure-holding tube 4-1 reaches a preset pressure threshold.

[0040] When pressurizing the pulse wave generator 4, the gas-filled pressure-holding tube 4-1 receives gas and holds the pressure. When the air pressure continuously increases and reaches the preset pressure threshold, the second diaphragm 4-3 ruptures and releases high-pressure gas to generate a pulse wave. During the simulation process, by controlling multiple pulse wave generators 4 to continuously hold pressure and burst, continuous pulse waves can be excited. Among them, the preset pressure threshold is the pressure resistance value of the selected second diaphragm 4-3, such as 3 Mpa.

[0041] Furthermore, the controller is used to perform the following operation steps.

[0042] Step S101: Control the electromagnetic valves 2 to be opened in sequence based on a preset time interval and a preset number of openings. After each electromagnetic valve 2 is opened, perform the following steps: When the second diaphragm 4-3 of the pulse wave generator 4 corresponding to the electromagnetic valve 2 ruptures to form a pulse wave, control the electromagnetic valve 2 to close; receive the pulse pressure signal of the shock wave pressure sensor 9.

[0043] Step S102: When there is no data response from the shock wave pressure sensor 9, stop receiving the signal.

[0044] Step S103: Draw a pressure curve graph based on the received pulse pressure signal of the shock wave pressure sensor 9 to obtain the simulation result of the propagation of continuous pulse waves in a multiphase medium.

[0045] It can be understood that due to the rupture of the second diaphragm 4-3, the gas-filled pressure-holding tube 4-1 will no longer be able to hold the pressure. If the electromagnetic valve 2 is still kept open at this time, it will affect the pulse pressure signals generated by other pulse wave generators 4. Therefore, after the second diaphragm 4-3 of a certain pulse wave generator 4 ruptures, the electromagnetic valve 2 corresponding to this pulse wave generator 4 must be closed to ensure the accuracy of the subsequent received pulse pressure signals.

[0046] Further, the continuous pulse wave generating assembly further 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, for forming a propagation channel of the pulse wave from the pulse wave generator 4 to the sand-filled shock tube 11.

[0047] Further, the device further includes: a first end cap 7, adopting a threaded structure and provided with a rubber gasket, for hermetically connecting the wave propagation tube 6 and the sand-filled shock tube 11; a first diaphragm 8, arranged at the connection of the wave propagation tube 6 and the sand-filled shock tube 11, for separating the wave propagation tube 6 and the sand-filled shock tube 11. Among them, the first diaphragm 8 adopts a waterproof diaphragm to prevent the fluid in the sand-filled shock tube 11 from entering the wave propagation tube 6 and having no influence on the propagation of the pulse wave.

[0048] Further, the device further includes: a pressure sensor monitoring chamber 10, corresponding to the shock wave pressure sensor 9 one by one, arranged outside the corresponding shock wave pressure sensor 9, for separating 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 has no influence on the propagation of the pulse wave.

[0049] Further, the device further includes: a second end cap 12, arranged at the second end of the sand-filled shock tube 11, for sealing the second end of the sand-filled shock tube 11.

[0050] Further, the device further includes: an outlet end 14, located on the second end cap 12, for discharging the fluid in the sand-filled shock tube 11; a filter screen 13, arranged between the second end of the sand-filled shock tube 11 and the outlet end 14, for preventing the solids in the sand-filled shock tube 11 from entering the outlet end 14. Among them, the filter screen 13 can be selected as a water-resistant filter screen to avoid being affected by the fluid in the sand-filled shock tube 11.

[0051] In some embodiments of the present invention, the above device is used for simulation, and the following steps S201 to S203 are executed before the simulation to meet the simulation requirements.

[0052] Step S201: Connect the sand-filled shock tube 11 and the second end cap 12, and place the filter screen 13 between the sand-filled shock tube 11 and the outlet end 14.

[0053] The placed filter screen 13 can be fixed in various ways. For example, the filter screen 13 is first placed at the second end of the sand-filled shock tube 11, and then the second end cover 12 is tightened with the second end of the sand-filled shock tube 11 to fix the filter screen. It is also possible to first cut the filter screen 13 to a size that matches the second end cover 12 and pre-place it inside the second end cover 12, and then tighten the second end cover 12 with the second end of the sand-filled shock tube 11 to fix the filter screen. The present invention does not limit this.

[0054] Step S202: Based on the target reservoir, design the sand-filled permeability, porosity in the sand-filled shock tube 11 and calculate the sand filling amount. A pressure sensor monitoring chamber 10 is buried at the preset pressure measurement site 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. Fill the inside of the sand-filled shock tube 11 with sand and compact it, and saturate the fluid (including but not limited to one or more of gas, water, crude oil) inside it according to the preset experiment. For example, when simulating the propagation of a pulse wave in a water-solid two-phase fluid, saturate it with water, and when simulating the propagation of a pulse wave in an oil-solid two-phase fluid, saturate it with oil.

[0055] Specifically, when filling the inside of the sand-filled shock tube 11 with sand, fill it from the first end of the sand-filled shock tube 11 and compact it. When saturating the fluid, first place the sand-filled shock tube 11 vertically with the second end down, and at this time the outlet end 14 is in a closed state; then add fluid to the first end until the fluid overflows, and at this time open the outlet end 14 to make the fluid slowly flow out from the outlet end 14; continue to add fluid to the first end to form a fluid flow inside the sand-filled shock tube 11 to saturate it more fully; after saturating the fluid, close the outlet end 14, and use the first end cover 7 and the first diaphragm 8 to physically isolate it at the second end.

[0056] In addition, if replacing the multiphase medium, for example, replacing the saturated water with saturated oil, the sand-filled shock tube 11 can be first placed vertically with the second end down and the outlet end 14 opened, and then oil is added from the first end, so as to realize the process of the oil discharging the water from the sand-filled shock tube 11.

[0057] Step S203: Connect the device and verify the airtightness. If the airtightness meets the requirements, the simulation can be started. Figure 1 Connect the device and verify the airtightness. If the airtightness meets the requirements, the simulation can be started.

[0058] After one simulation is completed, 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 the simulations are completed, disassemble the device and clean it. When cleaning the sand-filled shock tube 11, the outlet end 14 can be first opened to release the pressure and drain the fluid inside the sand-filled shock tube 11, so as to facilitate disassembly and cleaning.

[0059] Figure 3 It is a schematic flow chart of a simulation method for the propagation of continuous pulse waves in a multiphase medium provided by an embodiment of the present invention. This method is simulated based on the device described in any one of the above, and this method includes the following steps S101 to S103.

[0060] Step S101: Control the electromagnetic valves 2 to be opened in sequence based on a preset time interval and a preset number of openings. After each electromagnetic valve 2 is opened, perform the following steps: When a pulse wave is formed after the rupture of the second diaphragm 4-3 of the pulse wave generator 4 corresponding to the electromagnetic valve 2, control the electromagnetic valve 2 to close; receive the pulse pressure signal of the shock wave pressure sensor 9.

[0061] Step S102: When there is no data response from the shock wave pressure sensor 9, stop receiving signals.

[0062] Step S103: Draw a pressure curve graph based on the pulse pressure signal received by the shock wave pressure sensor 9 to obtain the simulation result of the propagation of continuous pulse waves in a multiphase medium.

[0063] This method is executed by a controller. For specific implementation, please refer to Figure 1 , and the electromagnetic valves 2 can be opened in sequence by the control software of the computer 5 with the help of the electromagnetic valve controller 3 according to the preset time interval and the preset number of openings.

[0064] Furthermore, the method further includes: comparing and analyzing the pressure curve graphs obtained under different simulation parameters to obtain the difference analysis result of the pulse wave propagation law under different simulation parameters. Among them, the simulation parameters include the type of filling medium, the preset time interval, the preset number of openings, the pressure resistance value of the second diaphragm 4-3, and the temperature.

[0065] Embodiment 1: The operation process of this embodiment is as follows: (1) Preparing the sand-filled shock tube; (2) Connecting the device; (3) Exciting continuous pulse waves; (4) Monitoring and recording the data of the shock wave pressure sensor in real time; (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 laws of different factors.

[0066] In this embodiment, five groups of simulations are carried out. The inner diameter of the sand-filled shock tube is selected as 10 cm, the outer diameter is 11 cm, and the pressure resistance value of the second diaphragm is 3 MPa. There are at least four pulse wave generators in the continuous pulse wave generating component.

[0067] It should also be noted that when the temperature rises, the propagation speed of the wave will increase. In this embodiment, the temperature can be set based on the temperature of the target reservoir, and an existing temperature adjustment device can be used to adjust the temperature in the simulation experiment.

[0068] The specific parameters are shown in Table 1. The position of the pressure measurement point can be adjusted within a certain range. For example, a 10 cm adjustment range can be reserved, and the actual position at 2 m can be set between 1.9 m and 2 m. The number of pulse wave emitters, that is, the preset number of openings, can be adjusted according to the requirements of the simulation experiment and the total number of pulse wave emitters. The continuous excitation pulse wave frequency is determined based on a preset time interval. For example, if 0.1 s is set, the continuous excitation pulse wave frequency is 10 Hz.

[0069] Table 1 Simulation parameters of continuous pulse wave propagation in multiphase media

[0070] The first group: Step 1: Connect the second end cap 12 of the sand-filled shock tube 11, and place a filter screen 13 between the sand-filled shock tube 11 and the outlet end 14.

[0071] Step 2: Do not perform any pre-filling treatment inside the sand-filled shock tube 11, and connect a shock wave pressure sensor 9 at 1 m and 2 m of the sand-filled shock tube 11 respectively.

[0072] Step 3: According to Figure 1 Connect the device and verify the airtightness.

[0073] Step 4: Through the control software of the computer 5, use the electromagnetic valve controller 3 to open the electromagnetic valve 2 corresponding to the first pulse wave generator, continuously fill the gas into the gas charging and pressure holding tube 4-1 of the pulse wave generator and hold the pressure. When the pressure-bearing capacity of the second diaphragm 4-3 of the first pulse wave generator reaches the upper limit of pressure bearing, the diaphragm ruptures to release high-pressure gas to form a high-pressure pulse wave, and at this time the electromagnetic valve 2 is immediately closed.

[0074] 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.

[0075] Step 6: Stop the experiment when there is no data response from the shock wave pressure sensor 9.

[0076] The second group: Continue on the basis of the first group of experiments: Step 1: The computer 5 controls the software to control the electromagnetic valve controller 3 to sequentially open the electromagnetic valves 2 corresponding to the second, third, and fourth pulse wave generators according to the set time interval (0.1 s), and continuously inject gas into the pulse wave generator air charging and pressure holding tubes and hold the pressure. When the pressure bearing capacity of the second diaphragms 4-3 of the second, third, and fourth pulse wave generators reaches the upper limit of pressure bearing, the diaphragms rupture in sequence to release high-pressure gas to form high-pressure pulse waves, and the corresponding electromagnetic valves are immediately closed. At this time, three consecutive shock waves are generated at a frequency of 10 Hz and enter the sand-filled shock tube 11.

[0077] Step 2: 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.

[0078] Step 3: Stop the experiment when there is no data response from the shock wave pressure sensor 9, and disassemble the device.

[0079] The third group: Step 1: Connect the second end cap 12 of the sand-filled shock tube 11, and place a filter screen 13 between the sand-filled shock tube 11 and the outlet end 14 to prevent the sand grains in the shock tube from entering the outlet end 14.

[0080] Step 2: Based on the target reservoir, design the sand filling permeability in the sand-filled shock tube 11 to be about 2 D and the porosity to be about 35%, and calculate the sand filling amount. Burry a pressure sensor monitoring chamber 10 and a shock wave pressure sensor 9 at 1 m and 2 m positions in the sand-filled shock tube 11 respectively. Do not perform saturated fluid treatment in the sand-filled shock tube 11, that is, it is in a saturated gas state inside.

[0081] Step 3: According to Figure 1 Connect the device and verify the airtightness.

[0082] Step 4: The computer 5 controls the software to control the electromagnetic valve controller 3 to open the electromagnetic valve 2 corresponding to the first pulse wave generator, and continuously inject gas into the pulse wave generator air charging and pressure holding tube and hold the pressure. When the pressure bearing capacity of the second diaphragm 4-3 of the first pulse wave generator reaches the upper limit of pressure bearing, the diaphragm ruptures to release high-pressure gas to form a high-pressure pulse wave, and at this time the electromagnetic valve 2 is immediately closed.

[0083] 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.

[0084] Step 6: Stop the experiment when there is no data response from the shock wave pressure sensor 9, disassemble the device, and clean the experimental equipment.

[0085] The fourth group: Continue to carry out on the basis of the end of the third group of experiments: Step 1: The computer 5 controls the software to use the electromagnetic valve controller 3 to sequentially open the electromagnetic valves 2 corresponding to the second, third, and fourth pulse wave generators according to the set time interval (0.1 s), and continuously inject gas into the gas charging and pressure holding tubes of the pulse wave generators and hold the pressure. When the pressure bearing capacities of the second diaphragms 4-3 of the second, third, and fourth pulse wave generators reach the upper limit of pressure bearing, the diaphragms rupture in sequence to release high-pressure gas to form high-pressure pulse waves, and the corresponding electromagnetic valves are immediately closed. At this time, three consecutive shock waves are generated at a frequency of 10 Hz and enter the sand-filled shock tube 11.

[0086] Step 2: 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.

[0087] Step 3: Stop the experiment when the shock wave pressure sensor 9 has no data response, disassemble the device, and clean the experimental equipment.

[0088] The fifth group: Step 1: Connect the second end cap 12 of the sand-filled shock tube 11, and place a filter screen 13 between the sand-filled shock tube 11 and the outlet end 14 to prevent the sand grains in the shock tube from entering the outlet end 14.

[0089] Step 2: Based on the target reservoir, design the sand filling permeability in the sand-filled shock tube 11 to be about 2 D and the porosity to be about 35%, and calculate the sand filling amount. Burry a pressure sensor monitoring chamber 10 and a shock wave pressure sensor 9 at 1 m and 2 m of the sand-filled shock tube 11 respectively. The sand-filled shock tube 11 is subjected to saturated water treatment, and the water saturation can reach more than 99%, that is, its internal is in a saturated water state.

[0090] Step 3: According to Figure 1 Connect the device and verify the airtightness.

[0091] Step 4: The computer 5 controls the software to use the electromagnetic valve controller 3 to sequentially open the electromagnetic valves 2 corresponding to the first, second, and third pulse wave generators according to the set time interval (0.1 s), and continuously inject gas into the gas charging and pressure holding tubes of the pulse wave generators and hold the pressure. When the pressure bearing capacities of the second diaphragms 4-3 of the first, second, and third pulse wave generators reach the upper limit of pressure bearing, the diaphragms rupture in sequence to release high-pressure gas to form high-pressure pulse waves, and the corresponding electromagnetic valves are immediately closed. At this time, three consecutive shock waves are generated at a frequency of 10 Hz and enter the sand-filled shock tube 11.

[0092] 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.

[0093] Step 6: Stop the experiment when the shock wave pressure sensor 9 has no data response, disassemble the device, and clean the experimental equipment.

[0094] After the above five groups of simulation experiments were completed, the pulse wave pressure signals recorded by the monitoring were respectively plotted as curve graphs to compare and analyze the propagation laws of pulse waves in multiphase media under different simulation parameters: (1) By comparing the first group and the second group, the propagation law of continuously excited pulse waves in air can be clarified (the first group is equivalent to a control experiment for monitoring the propagation law of shock waves in a conventional shock tube); (2) By comparing the first group and the third group, the difference in the propagation law of a single pulse wave in a sand-filled porous medium and its propagation law in a pure gas medium can be compared separately; (3) By comparing the second group and the fourth group, the propagation law of continuously pulsed waves in a porous medium can be clarified; (4) By comparing the fourth group and the fifth group, the difference in the propagation laws of continuously pulsed waves in gas-solid two-phase and liquid-solid two-phase can be clarified.

[0095] Figure 4 It is a schematic diagram of the pressure curves at two pressure measurement points in the first group of simulation experiments provided by the embodiments of the present invention. Figure 5 It is a schematic diagram of the pressure curves at two pressure measurement points in the second group of simulation experiments provided by the embodiments of the present invention. Figure 6 It is a schematic diagram of the pressure curves at two pressure measurement points in the third group of simulation experiments provided by the embodiments of the present invention. Figure 7 It is a schematic diagram of the pressure curves at two pressure measurement points in the fourth group of simulation experiments provided by the embodiments of the present invention. Figure 8 It is a schematic diagram of the pressure curves at two pressure measurement points in the fifth group of simulation experiments provided by the embodiments of the present invention. Please refer to Figures 4 to 8 , it can be found that the pressure curve fluctuates violently, the speed at which the pressure curve reaches the peak value is fast, but the attenuation is slow. Among them, the results of the first group are similar to the existing research results, such as (1) Cheng Shuai, Tong Nianxue, Liu Wenxiang, etc. Control method for shock wave attenuation process of explosion wave simulated shock tube based on high-pressure gas drive [J]. Explosion and Shock Waves, 2024, 44(05): 74-80, (2) Song Yuhan, Chen Xiangfeng, Yang Xinyu, etc. Influence of bursting disc rupture mechanism on shock wave propagation characteristics in an explosion shock tube [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 group and the second group, it can be found that there is a superposition effect of fluctuations in three consecutive excitation waves; (2) By comparing the first group and the third group, it can be found that in the sand-filled shock tube, the excitation wave mainly propagates through solids and gases, and the time to receive the pressure signal is advanced because the wave propagates faster in solids; (3) By comparing the second group and the fourth group, it can be seen that there is still a superposition effect of continuously excited waves in the sand-filled shock tube, but the peak value change of the superposition is significantly lower than that of the second group, but the overall pressure curve remains at a relatively high level; (4) By comparing the fourth group and the fifth group, it can be seen that the propagation and attenuation speeds of waves in the saturated water porous medium are faster, and the superposition effect of continuously excited waves also exists.

[0096] In view of the problems existing in the existing experimental devices and methods for evaluating the propagation law of pulsed waves in shock tubes, such as the inability to evaluate the propagation law of continuous pulsed waves and the inability to evaluate the propagation law in porous media and multiphase media, the present invention realizes the evaluation of the propagation law of continuous pulsed waves in multiphase media by establishing a continuous pulsed wave generating component to generate continuous pulsed waves and a sand-filled shock tube to simulate the porous media of saturated fluid, and combining the two, providing in-door experimental support for oil and gas seismic exploration, ultrasonic exploration and wave exploitation.

[0097] This application is described with reference to the flowcharts and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of flows and / or blocks in the flowcharts and / or block diagrams, can be realized by computer program instructions. These computer program instructions can be provided to the processors of general-purpose computers, special-purpose computers, embedded processors, or other programmable data processing devices to generate a machine, so that the instructions executed by the processors of the computer or other programmable data processing devices generate means for realizing the functions specified in Figure 1 one or more flows and / or Figure 1 blocks.

[0098] These computer program instructions can 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 generate a manufactured article including instruction means, and the instruction means realizes the functions specified in Figure 1 one or more flows and / or Figure 1 blocks.

[0099] These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process, and thus the instructions executed on the computer or other programmable device provide steps for realizing the functions specified in Figure 1 one or more flows and / or Figure 1 blocks.

[0100] In a typical configuration, a computing device includes one or more processors (CPUs), an input / output interface, a network interface, and a memory.

[0101] The memory may include non-permanent memory in the form of computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0102] Computer-readable media includes permanent and non-permanent, removable and non-removable media and can store information by any method or technology. The 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 memory (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, CD-ROM, digital versatile discs (DVD) or other optical storage, magnetic cassettes, magnetic tape disk storage or other magnetic storage devices, or any other non-transitory medium 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 media such as modulated data signals and carrier waves.

[0103] It should also be noted that the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0104] The above are only embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the scope of the claims of the present application.

Claims

1. An analog device for 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), respectively arranged at preset pressure measuring positions in the sand-filled shock wave tube (11), and used for monitoring 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 multi-phase medium, wherein the sand filling includes no sand filling or quartz sand, and the multi-phase medium includes pure air, saturated water or saturated oil.

3. The device according to claim 1, wherein The pulse wave generator (4) comprises: An inflation pressure-holding tube (4-1), a first end of the inflation pressure-holding tube (4-1) being connected to the constant-pressure gas source (1) and being used for receiving gas from the constant-pressure gas source (1); An air-filling and pressure-holding tube sealing end cover (4-2), arranged at the second end of the air-filling and pressure-holding tube (4-1), and used for sealing the second end of the air-filling 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, wherein The controller is used 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, and 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, stopping receiving signals; A pressure curve graph 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), so as to form 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 also includes: A first end cover (7) having a threaded structure and provided with a rubber gasket, and used for sealingly connecting the wave propagation tube (6) and the sand-filled shock tube (11); The first diaphragm (8) is arranged at the connection of 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 includes: The pressure sensor monitoring chamber (10) corresponds to the shock wave pressure sensor (9) one by one and is arranged outside the corresponding shock wave pressure sensor (9) to separate the shock wave pressure sensor (9) from the filling medium and provide a clean space for the shock wave pressure sensor (9).

8. The device according to claim 1, characterized in that The device further includes: The second end cap (12) is arranged 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 includes: The outlet end (14) is located on the second end cap (12) and is used to discharge the fluid in the sand-filled shock tube (11); The filter screen (13) is arranged between the second end of the sand-filled shock tube (11) and the outlet end (14) and is used to prevent the solids in the sand-filled shock tube (11) from entering the outlet end (14).

10. A simulation method for the propagation of continuous pulse waves in a multiphase medium, characterized in that, The method is simulated based on the device described in claim 3, and the method includes: Controlling the electromagnetic valves (2) to be opened in sequence based on a preset time interval and a preset number of openings. After each electromagnetic valve (2) is opened, the following steps are executed: When the second diaphragm (4-3) of the pulse wave generator (4) corresponding to the electromagnetic valve (2) ruptures to form a pulse wave, controlling the electromagnetic valve (2) to close; Receiving the pulse pressure signal of the shock wave pressure sensor (9); When there is no data response from the shock wave pressure sensor (9), stopping receiving the signal; Drawing a pressure curve graph based on the received pulse pressure signal of the shock wave pressure sensor (9) to obtain the simulation result of the propagation of continuous pulse waves in a multiphase medium.

11. The method according to claim 10, wherein The method further includes: Comparatively analyzing the pressure curve graphs obtained under different simulation parameters to obtain the difference analysis result of the pulse wave propagation law under different simulation parameters, wherein 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.

Images