Method, device and equipment for determining instantaneous interfacial tension of mixed-phase system and medium

Abstract

The invention discloses a method, a device and equipment for determining instantaneous interfacial tension of a mixed-phase system and a medium. According to the scheme, the confining pressure of a high-pressure clamping device clamping the Hel-Shaw model is increased to first preset pressure, and the temperature of the high-pressure clamping device is increased to preset temperature; a first substance with the first viscosity and a second substance with the second viscosity are sequentially injected into the Hel-Shaw model from the inlet end of the high-pressure clamping device according to the preset injection speed, and the pressure of the outlet end of the high-pressure clamping device is kept to be second preset pressure through a back-pressure valve connected with the outlet end of the high-pressure clamping device in the second substance injection process; recording the injection duration of the second substance and determining the number of finger-shaped bulges formed in the first substance by the second substance corresponding to the injection duration; and the instantaneous interfacial tension is determined according to the first viscosity, the second viscosity, the injection duration, the preset injection speed, the number of the finger-shaped protrusions and the size and distance of injection holes of the Hel-Shaw model. According to the technical scheme, the instantaneous interfacial tension of the mixed-phase system can be simply and easily determined.

Description

Technical Field

[0001] The present application relates to the technical field of oil and gas field development, and in particular to a method, device, equipment and medium for determining the instantaneous interfacial tension of a mixed phase system. Background Art

[0002] As conventional oil and gas reservoirs become increasingly depleted, the importance of tight oil and gas resources is gradually becoming apparent. However, due to the characteristics of low microscopic pore size and high pore-throat ratio, the development effect of conventional water injection is difficult to meet the development needs of this type of reservoir. In this context, miscible flooding technology represented by injecting CO2, natural gas and other gases has become an important technical means for the development of this type of reservoir.

[0003] In oil and gas reservoirs, miscibility is defined as two or more fluids that can be mixed into a single phase in any proportion, that is, miscibility is achieved when the interfacial tension of the two or more phases is zero. The key to miscible flooding technology is to determine the instantaneous interfacial tension of the miscible system. At present, theoretical calculations or experimental tests are usually used to determine the instantaneous interfacial tension of the miscible system. Among them, the theoretical calculation accuracy is not high; and experimental test methods such as the capillary test method, the bubble riser method or the interfacial tension disappearance method, on the one hand, have high equipment requirements and high testing costs; on the other hand, under high pressure conditions, the mass transfer between phases affects the determination of the instantaneous interfacial tension, which makes it difficult to meet the test requirements of the instantaneous interfacial tension. As a result, the microscopic seepage mechanism of the miscible system is not clearly understood, which causes certain difficulties and risks to the actual application effect and uncertainty analysis of miscible gas flooding in tight oil reservoirs.

[0004] Therefore, how to provide a technical solution that can simply and easily determine the instantaneous interfacial tension of a mixed-phase system is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0005] The present application provides a method, device, equipment and medium for determining the instantaneous interfacial tension of a mixed-phase system, which can simply and easily determine the instantaneous interfacial tension of a mixed-phase system by utilizing the viscous fingering phenomenon.

[0006] According to one aspect of the present application, a method for determining instantaneous interfacial tension of a mixed phase system is provided, the method comprising:

[0007] Raising the confining pressure of a high-pressure holder holding the Hele-Shaw model to a first preset pressure, and raising the temperature of the high-pressure holder to a preset temperature;

[0008] Injecting a first substance having a first viscosity and a second substance having a second viscosity into the Hele-Shaw model from the inlet end of the high-pressure clamp in sequence at a preset injection speed, and maintaining the pressure at the outlet end of the high-pressure clamp at a second preset pressure through a back pressure valve connected to the outlet end of the high-pressure clamp during the injection of the second substance; wherein the first viscosity is greater than the second viscosity, and the first preset pressure is greater than the second preset pressure;

[0009] After the injection of the first substance is completed, recording the injection time of the second substance, and determining the number of finger-like protrusions formed by the second substance in the first substance corresponding to the injection time;

[0010] The instantaneous interfacial tension is determined according to the first viscosity, the second viscosity, the injection time, the preset injection speed, the number of finger-like protrusions, the injection hole size of the Hele-Shaw model and the spacing of the Hele-Shaw model.

[0011] According to another aspect of the present application, a device for determining instantaneous interfacial tension of a mixed phase system is provided, the device comprising:

[0012] A high-temperature and high-pressure environment setting module, used to increase the confining pressure of a high-pressure holder for holding the Hele-Shaw model to a first preset pressure, and to increase the temperature of the high-pressure holder to a preset temperature;

[0013] A miscible displacement process simulation module, used for sequentially injecting a first substance with a first viscosity and a second substance with a second viscosity from the inlet end of the high-pressure clamp into the Hele-Shaw model at a preset injection speed, and during the injection of the second substance, maintaining the pressure at the outlet end of the high-pressure clamp at a second preset pressure through a back pressure valve connected to the outlet end of the high-pressure clamp; wherein the first viscosity is greater than the second viscosity, and the first preset pressure is greater than the second preset pressure;

[0014] a finger-like protrusion quantity determination module, configured to record the injection time of the second substance after the injection of the first substance is completed, and determine the number of finger-like protrusions formed by the second substance in the first substance corresponding to the injection time;

[0015] The instantaneous interfacial tension determination module is used to determine the instantaneous interfacial tension according to the first viscosity, the second viscosity, the injection time, the preset injection speed, the number of finger-like protrusions, the injection hole size of the Hele-Shaw model and the spacing of the Hele-Shaw model.

[0016] According to another aspect of the present application, a device for determining instantaneous interfacial tension of a mixed phase system is provided, the device comprising:

[0017] at least one processor; and

[0018] a memory communicatively connected to the at least one processor; wherein,

[0019] The memory stores a computer program that can be executed by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the method for determining the instantaneous interfacial tension of a mixed-phase system described in any embodiment of the present application.

[0020] According to another aspect of the present application, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the method for determining the instantaneous interfacial tension of a mixed-phase system described in any embodiment of the present application when executed.

[0021] The technical solution provided by the present application is to raise the confining pressure of the high-pressure clamp holding the Hele-Shaw model to a first preset pressure, and raise the temperature of the high-pressure clamp to a preset temperature; inject a first substance with a first viscosity and a second substance with a second viscosity into the Hele-Shaw model from the inlet end of the high-pressure clamp in sequence according to a preset injection speed, and keep the outlet end pressure of the high-pressure clamp at the second preset pressure through a back pressure valve connected to the outlet end of the high-pressure clamp during the injection of the second substance; record the injection time of the second substance and determine the number of finger-like protrusions formed by the second substance in the first substance corresponding to the injection time; determine the instantaneous interfacial tension according to the first viscosity, the second viscosity, the injection time, the preset injection speed, the number of finger-like protrusions, the injection hole size of the Hele-Shaw model and the spacing of the Hele-Shaw model. The present technical solution, using the viscous fingering phenomenon, can simply and easily determine the instantaneous interfacial tension of a mixed phase system.

[0022] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present application, nor is it intended to limit the scope of the present application. Other features of the present application will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 A flow chart of a method for determining instantaneous interfacial tension of a mixed phase system provided in Example 1 of the present application;

[0025] Figure 2 A schematic diagram of a mixed phase system instantaneous interfacial tension testing device provided in an embodiment of the present invention;

[0026] Figure 3 A flow chart of a method for determining instantaneous interfacial tension of a mixed phase system provided in Example 2 of the present application;

[0027] Figure 4 A flow chart of a method for determining instantaneous interfacial tension of a mixed phase system provided in Example 3 of the present application;

[0028] Figure 5 A schematic diagram of the structure of a device for determining instantaneous interfacial tension of a mixed phase system provided in Example 4 of the present application;

[0029] Figure 6 It is a schematic diagram of the structure of an apparatus for implementing a method for determining the instantaneous interfacial tension of a mixed-phase system in an embodiment of the present application. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work should fall within the scope of protection of the present application.

[0031] It should be noted that the terms "first", "second", "preset", "target", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0032] Embodiment 1

[0033] Figure 1This is a flow chart of a method for determining the instantaneous interfacial tension of a mixed phase system provided in Example 1 of the present application. This embodiment is applicable to the case of determining the interfacial tension between any two fluids of different viscosities. The method can be executed by a device for determining the instantaneous interfacial tension of a mixed phase system. The device for determining the instantaneous interfacial tension of a mixed phase system can be implemented in the form of hardware and / or software. The device for determining the instantaneous interfacial tension of a mixed phase system can be configured in a device with data processing capabilities. Figure 1 As shown, the method includes:

[0034] S110, raising the confining pressure of the high-pressure clamp that clamps the Hele-Shaw model to a first preset pressure, and raising the temperature of the high-pressure clamp to a preset temperature.

[0035] Among them, when a low-viscosity fluid displaces a high-viscosity fluid, Saffman-Taylor instability phenomenon will occur in the Hele-Shaw model. The embodiment of the present invention builds a test equipment based on the Saffman-Taylor instability phenomenon to analyze the Saffman-Taylor instability phenomenon and determine the instantaneous interfacial tension of the mixed phase system.

[0036] In the embodiment of the present invention, in order to make the test environment closer to the real reservoir environment, the temperature and pressure of the Hele-Shaw model may be increased to a preset temperature and a preset pressure respectively.

[0037] The high pressure clamp is used to clamp the Hele-Shaw model and simulate the real reservoir environment for the Hele-Shaw model. The confining pressure is the pressure exerted on the rock by the surrounding rock mass of the simulated rock. The first preset pressure and the preset temperature can be determined according to the actual situation. For example, the first preset pressure can be 9MPa and the preset temperature can be 50℃.

[0038] Optionally, the confining pressure of the high-pressure clamp that clamps the Hele-Shaw model is increased to a first preset pressure, and the temperature of the high-pressure clamp is increased to a preset temperature, including: adjusting the confining pressure of the high-pressure clamp that clamps the Hele-Shaw model to the first preset pressure through a horizontal flow pump connected to the inlet end of the high-pressure clamp that clamps the Hele-Shaw model; and increasing the temperature of the high-pressure clamp to a preset temperature through a heater in the high-pressure clamp.

[0039] Specifically, the relevant test equipment can be evacuated first, and the confining pressure of the high-pressure clamp can be increased by a horizontal flow pump connected to the inlet end of the high-pressure clamp that clamps the Hele-Shaw model; after the pressure reaches the first preset pressure, the temperature of the high-pressure clamp can be increased to a preset temperature by a temperature control module in the high-pressure clamp. During the temperature increase process, the confining pressure of the high-pressure clamp can be continuously controlled by the horizontal flow pump to be stable at the first preset pressure. The beneficial effect of the above technical solution is that it provides a high-temperature and high-pressure environment for the instantaneous interfacial tension of the mixed-phase system, so that the test results are more reliable and practical.

[0040] Optionally, before establishing the high temperature and high pressure environment, kerosene may be used to clean the pipelines and related containers, and then the above equipment may be blown dry using compressed air to eliminate residual kerosene and kerosene vapor.

[0041] S120. Injecting a first substance having a first viscosity and a second substance having a second viscosity into the Hele-Shaw model in sequence from the inlet end of the high-pressure clamp at a preset injection speed. During the injection of the second substance, the pressure at the outlet end of the high-pressure clamp is maintained at a second preset pressure by a back pressure valve connected to the outlet end of the high-pressure clamp; wherein the first viscosity is greater than the second viscosity, and the first preset pressure is greater than the second preset pressure.

[0042] The first substance may be a hydrocarbon substance, such as heptane, decane, dodecane, hexadecane, etc. The second substance may be carbon dioxide, natural gas, etc.

[0043] In an embodiment of the present invention, the first substance and the second substance may be stored in an intermediate container in advance, respectively, and after a high temperature and high pressure environment is established, they are injected into the Hele-Shaw model from the inlet end of the high pressure holder through a connecting channel between the intermediate container and the high pressure holder.

[0044] Specifically, the first substance can be dyed with an oil-soluble fluorescent agent and the dyed first substance can be stored in a first intermediate container, and the second substance can be stored in a second intermediate container and pressurized to a second preset pressure; wherein the first intermediate container is connected to the inlet end of the high-pressure clamp, and the second intermediate container is connected to the inlet end of the high-pressure clamp.

[0045] Optionally, a first substance with a first viscosity and a second substance with a second viscosity are sequentially injected from the inlet end of the high-pressure clamp into the Hele-Shaw model at a preset injection speed, including: injecting the first substance with a first viscosity into the Hele-Shaw model from the inlet end of the high-pressure clamp at a preset injection speed, and adjusting the pressure at the outlet end of the high-pressure clamp to a second preset pressure through a back pressure valve connected to the outlet end of the high-pressure clamp; injecting the second substance with a second viscosity into the Hele-Shaw model from the inlet end of the high-pressure clamp at a preset injection speed, and maintaining the pressure at the outlet end of the high-pressure clamp at the second preset pressure through a back pressure valve connected to the outlet end of the high-pressure clamp during the injection of the second substance.

[0046] In the Hele-Shaw model, the Saffman-Taylor instability phenomenon occurs only when a fluid with a low viscosity displaces a fluid with a high viscosity. Therefore, the first substance with a high viscosity can be injected into the Hele-Shaw model from the inlet of the high-pressure holder at a preset injection speed, and then the second substance with a low viscosity can be injected into the Hele-Shaw model from the inlet of the high-pressure holder at a preset injection speed.

[0047] Since the pressure in the second intermediate container storing the second substance is the second preset pressure, after the first substance is injected into the Hele-Shaw model, the pressure at the outlet of the high-pressure clamp needs to be adjusted to the second preset pressure through the back pressure valve connected to the outlet of the high-pressure clamp to ensure that the pressures in the second intermediate container and the high-pressure clamp are equal when the second substance is injected.

[0048] S130, after the first substance is injected, recording the injection time of the second substance and determining the number of finger-like protrusions formed by the second substance in the first substance.

[0049] Due to the difference in viscosity between the first substance and the second substance, it is easy for the front edge of the displacing phase fluid to penetrate into the displaced phase fluid in a finger-like manner.

[0050] The finger-like protrusions are finger-like phenomena formed by the second material with a relatively low viscosity. The number of finger-like protrusions can be determined by collecting images of the Hele-Shaw model after injection using an image collector, and the number of finger-like protrusions can be determined based on the collected images.

[0051] Specifically, the second substance is injected after the first substance is injected, and the injection start time of the second substance is taken as the initial time; an image of the Hele-Shaw model is acquired through an image acquisition device, and the time when the image is acquired is taken as the injected time; the difference between the injected time and the initial time is taken as the injection duration of the second substance.

[0052] Optionally, determining the number of finger-like protrusions formed by the second substance in the first substance corresponding to the injection duration includes: detecting the Hele-Shaw model through a microscope to obtain a target image of the Hele-Shaw model during the injection process; and determining, based on the target image, the number of finger-like protrusions formed by the second substance in the first substance corresponding to the injection duration.

[0053] Specifically, a microscope and a light source may be installed directly above the Hele-Shaw model, the microscope being connected to a video display computer, and the image may be acquired by controlling the microscope to align with the Hele-Shaw model, and the acquired target image may be displayed on the video display computer.

[0054] Furthermore, the number of finger-like protrusions can be determined based on the target image. The technician can observe the number of finger-like protrusions in the target image and input the result into the program for determining the instantaneous interfacial tension of the mixed-phase system. Alternatively, a model for determining the number of finger-like protrusions can be pre-trained based on an image set containing finger-like protrusions and annotated with the number of finger-like protrusions, and the number of finger-like protrusions can be output based on the model for determining the number of finger-like protrusions.

[0055] S140, determining instantaneous interfacial tension according to the first viscosity, the second viscosity, the injection time, the preset injection speed, the number of finger-like protrusions, the injection hole size of the Hele-Shaw model, and the spacing of the Hele-Shaw model.

[0056] Generally, when the Saffman-Taylor instability occurs, there is a certain mathematical relationship between the first viscosity, the second viscosity, the injection time, the preset injection speed, the number of finger-like protrusions, the injection hole size of the Hele-Shaw model, the spacing of the Hele-Shaw model and the instantaneous interfacial tension. The instantaneous interfacial tension can be solved and determined through the mathematical relationship.

[0057] Optionally, determining the instantaneous interfacial tension according to the first viscosity, the second viscosity, the injection time, the preset injection speed, the number of finger-like protrusions, the injection hole size of the Hele-Shaw model, and the spacing of the Hele-Shaw model includes:

[0058] The instantaneous interfacial tension is determined using the following formula:

[0059]

[0060] Among them, n Ais the number of finger-like protrusions, r0 is the injection hole radius of the Hele-Shaw model, V is the preset injection speed, t is the injection time, m is the spacing of the Hele-Shaw model, η1 is the first viscosity, η2 is the second viscosity, σ is the instantaneous interfacial tension, and a, b and c are constants.

[0061] When the properties of the first substance are different, the method for determining the first viscosity η1 is also different. When the first substance is a Newtonian fluid, the first viscosity η1 is a constant; when the first substance is a non-Newtonian fluid, the first viscosity η1 can be determined using the following formula:

[0062] Specifically, the injection time t and the number of finger-like protrusions n A It can be determined by step S130, the injection hole radius r0 and the spacing m of the Hele-Shaw model can be determined by the parameters preset by the Hele-Shaw model, the preset injection speed V can be the speed set by the plunger pump that provides the material injection power, the first viscosity η1 and the second viscosity η2 can be obtained by pre-performing viscosity test experiments, and a, b and c can be determined based on experimental experience. Further, the instantaneous interfacial tension can be determined by the above mathematical relationship.

[0063] For example, Figure 2 Schematic diagram of a mixed phase system instantaneous interfacial tension test device provided in an embodiment of the present invention. Figure 2 The test equipment shown here determines the instantaneous interfacial tension of a mixed phase system as follows:

[0064] The first step is to use kerosene to clean the pipelines and related containers, and then use compressed air to blow dry the above cleaning equipment to eliminate residual kerosene and kerosene vapor;

[0065] Step 2: After the gaseous CO2 is introduced into the second intermediate container 7, it is pressurized to a second preset pressure; at the same time, the hydrocarbon sample required for the experiment is dyed with an oil-soluble fluorescent agent and introduced into the first intermediate container 3; the first intermediate container 3 and the second intermediate container 7 containing CO2 and hydrocarbon substances are respectively connected to the inlet end of the high-pressure holder 4;

[0066] Step 3: Figure 2 After each of the connected devices is evacuated, the confining pressure of the high-pressure holder 4 holding the Hele-Shaw model 5 is increased to a first preset pressure by using the horizontal flow pump 13; then the dyed hydrocarbon material in the first intermediate container 3 is injected into the Hele-Shaw model 5 by using the first plunger pump 2;

[0067] Step 4: Continue to inject hydrocarbon material after the hydrocarbon is saturated, and control the pressure at the outlet of the high-pressure holder 4 to reach a second preset pressure through the back pressure valve 10, the manual pump 11 and the container 9 connected to the outlet of the high-pressure holder 4;

[0068] Step 5: Use the second plunger pump 8 to inject the gaseous or liquid CO2 in the second intermediate container 7 into the Hele-Shaw model 5 at a preset injection speed, use the microscope 6 to detect the Hele-Shaw model 5, and obtain the observation image and record the injection time through the video display computer 1 connected to the microscope 6; wherein the light source 12 is used to provide illumination for the microscope 6 to avoid unclear observation images obtained by the video display computer 1;

[0069] Step 6. Determine the instantaneous interfacial tension based on the viscosity of the hydrocarbon, the viscosity of CO2, the injection time, the preset injection speed, the number of finger-like protrusions in the observed image, the injection hole size of the Hele-Shaw model, and the spacing of the Hele-Shaw model.

[0070] An embodiment of the present invention provides a method for determining the instantaneous interfacial tension of a mixed phase system, wherein the method comprises the following steps: raising the confining pressure of a high-pressure clamp that clamps a Hele-Shaw model to a first preset pressure, and raising the temperature of the high-pressure clamp to a preset temperature; injecting a first substance having a first viscosity and a second substance having a second viscosity into the Hele-Shaw model from an inlet end of the high-pressure clamp in sequence at a preset injection speed, and maintaining the outlet end pressure of the high-pressure clamp at a second preset pressure via a back pressure valve connected to an outlet end of the high-pressure clamp during the injection of the second substance; recording the injection time of the second substance and determining the number of finger-like protrusions formed by the second substance in the first substance corresponding to the injection time; and determining the instantaneous interfacial tension according to the first viscosity, the second viscosity, the injection time, the preset injection speed, the number of finger-like protrusions, the injection hole size of the Hele-Shaw model, and the spacing of the Hele-Shaw model. This technical solution takes the Saffman-Taylor unstable flow phenomenon in a two-phase system as the observation object. Through the established experimental process and experimental equipment, the number of finger-like protrusions recorded during the Saffman-Taylor unstable flow is used to calculate the interfacial tension between the two phases, thereby realizing the determination of the interfacial tension between different media. First, this solution can realize the determination of interfacial tension under different temperature and pressure conditions, ensuring that the measurement results are more in line with the actual temperature and pressure conditions of the reservoir. Secondly, this interfacial tension test scheme has no specific requirements for the test medium, and can realize the test of instantaneous interfacial tension between mixed media with interphase mass transfer, thereby providing technical support for quantitatively determining the size distribution of capillary forces in the non-miscible stage carbon dioxide / natural gas-crude oil system and quantitatively describing the microscopic seepage law. Finally, this scheme has low requirements for the required test equipment, low cost for establishing the measurement system, and strong scalability.

[0071] Embodiment 2

[0072] Figure 3 This is a flow chart of a method for determining the instantaneous interfacial tension of a mixed phase system provided in Example 2 of the present application. This example is optimized based on the above example. Figure 3 As shown, the method of this embodiment specifically includes the following steps:

[0073] S210, respectively raising the confining pressure of the high-pressure clamp for clamping the Hele-Shaw model to at least two first preset pressures, and raising the temperature of the high-pressure clamp to a preset temperature; wherein the values ​​of the first preset pressures are different.

[0074] Specifically, a plurality of first preset pressures may be set respectively to determine the instantaneous interfacial tension of the mixed-phase system at different first preset pressures, and further determine the corresponding relationship between the first preset pressure and the instantaneous interfacial tension.

[0075] Exemplarily, heptane is displaced by carbon dioxide at a preset temperature of 50° C., and the first preset pressures are set to 9.3 MPa, 7.92 MPa, and 4.48 MPa, respectively.

[0076] As another example, when hexadecane is displaced by carbon dioxide at a preset temperature of 25° C., the first preset pressures are set to 8.2 MPa, 9.2 MPa, and 10.7 MPa, respectively.

[0077] S220, injecting a first substance having a first viscosity and a second substance having a second viscosity into the Hele-Shaw model from the inlet end of the high-pressure clamp in sequence at a preset injection speed, and during the injection of the second substance, maintaining the pressure at the outlet end of the high-pressure clamp at a second preset pressure through a back pressure valve connected to the outlet end of the high-pressure clamp; wherein the first viscosity is greater than the second viscosity, and the first preset pressure is greater than the second preset pressure.

[0078] S230: After the first substance is injected, record the injection time of the second substance, and determine the number of finger-like protrusions formed by the second substance in the first substance corresponding to the injection time.

[0079] S240, determining instantaneous interfacial tension according to the first viscosity, the second viscosity, the injection time, the preset injection speed, the number of finger-like protrusions, the injection hole size of the Hele-Shaw model, and the spacing of the Hele-Shaw model.

[0080] S250: Determine a corresponding relationship between the first preset pressure and the instantaneous interfacial tension according to each of the first preset pressures and the instantaneous interfacial tension corresponding to each of the first preset pressures.

[0081] In an embodiment of the present invention, the relationship between the first preset pressure and the instantaneous interfacial tension can be determined by performing data fitting on the first preset pressure and the instantaneous interfacial tension of different types of displacement phases, and the correlation between the first preset pressure and the instantaneous interfacial tension of different types of displacement phases can be determined based on whether the correlation is positively correlated or negatively correlated.

[0082] Exemplarily, when heptane is displaced by carbon dioxide at a preset temperature of 50° C., the first preset pressures are set to 9.3 MPa, 7.92 MPa, and 4.48 MPa, respectively, and the measured instantaneous interfacial tensions are 0.35 mN / min, 1.37 mN / min, and 7.92 mN / min, respectively.

[0083] As another example, when hexadecane is displaced by carbon dioxide at a preset temperature of 25° C., the first preset pressures are set to 8.2 MPa, 9.2 MPa, and 10.7 MPa, respectively, and the measured instantaneous interfacial tensions are 9.2 mN / min, 6.88 mN / min, and 4.58 mN / min, respectively.

[0084] It can be seen from the above data that, for the same type of alkane, the higher the first preset pressure is, the smaller the interfacial tension between carbon dioxide and the alkane is, and the two are negatively correlated.

[0085] Furthermore, the oil well productivity and the overall development effect and law of the tight oil reservoir can be analyzed based on the relationship between the first preset pressure and the interfacial tension.

[0086] An embodiment of the present invention provides a method for determining the instantaneous interfacial tension of a mixed phase system, the method comprising: raising the confining pressure of a high-pressure clamp that clamps a Hele-Shaw model to at least two first preset pressures, and raising the temperature of the high-pressure clamp to a preset temperature; wherein the values ​​of the first preset pressures are different; injecting a first substance with a first viscosity and a second substance with a second viscosity into the Hele-Shaw model from an inlet end of the high-pressure clamp in sequence at a preset injection speed, and during the injection of the second substance, maintaining the pressure at the outlet end of the high-pressure clamp at a second preset pressure through a back pressure valve connected to the outlet end of the high-pressure clamp; wherein the first viscosity is greater than the second viscosity, and the first preset pressure is greater than the second preset pressure; recording the injection time of the second substance and determining the number of finger-like protrusions formed by the second substance in the first substance corresponding to the injection time; determining the instantaneous interfacial tension according to the first viscosity, the second viscosity, the injection time, the preset injection speed, the number of finger-like protrusions, the injection hole size of the Hele-Shaw model, and the spacing of the Hele-Shaw model; determining the corresponding relationship between the first preset pressure and the instantaneous interfacial tension according to each first preset pressure and the instantaneous interfacial tension corresponding to each first preset pressure. This technical solution provides data support for the oil well productivity and the overall development effect and law of tight oil reservoirs by determining the law between the first preset pressure and the instantaneous interfacial tension.

[0087] Embodiment 3

[0088] Figure 4 This is a flow chart of a method for determining the instantaneous interfacial tension of a mixed phase system provided in Example 3 of the present application. This example is optimized based on the above example. Figure 4 As shown, the method of this embodiment specifically includes the following steps:

[0089] S310, raising the confining pressure of the high-pressure clamp that clamps the Hele-Shaw model to a first preset pressure, and raising the temperature of the high-pressure clamp to a preset temperature.

[0090] S320. Inject at least two types of first substances with a first viscosity and a second substance with a second viscosity into the Hele-Shaw model in sequence from the inlet end of the high-pressure clamp at a preset injection speed. During the injection of the second substance, the pressure at the outlet end of the high-pressure clamp is maintained at a second preset pressure by a back pressure valve connected to the outlet end of the high-pressure clamp; wherein each type of first substance contains a different number of carbon atoms, the first viscosity is greater than the second viscosity, and the first preset pressure is greater than the second preset pressure.

[0091] Specifically, under the same high temperature and high pressure environment, the same type of second substance may be used to displace different types of first substances, so as to determine the relationship between the type of displaced phase and the interfacial tension.

[0092] Exemplarily, under an environment where the first preset pressure is 6 MPa and the preset temperature is 25° C., carbon dioxide is used to displace decane and dodecane, respectively.

[0093] S330: After the first substance is injected, record the injection time of the second substance, and determine the number of finger-like protrusions formed by the second substance in the first substance corresponding to the injection time.

[0094] S340, determining instantaneous interfacial tension according to the first viscosity, the second viscosity, the injection time, the preset injection speed, the number of finger-like protrusions, the injection hole size of the Hele-Shaw model and the spacing of the Hele-Shaw model.

[0095] S350: Determine a correspondence between the type of the first substance and the instantaneous interfacial tension according to the type of each of the first substances and the instantaneous interfacial tension corresponding to the type of the first substance.

[0096] In an embodiment of the present invention, the relationship between the number of carbon atoms and the instantaneous interfacial tension can be determined by fitting the data of the number of carbon atoms and the instantaneous interfacial tension of different types of displacement phases, or the correlation between the number of carbon atoms of the first substance and the instantaneous interfacial tension can be determined to be positive or negative.

[0097] Exemplarily, under an environment where the first preset pressure is 6 MPa and the preset temperature is 25° C., carbon dioxide is used to displace decane and dodecane, respectively, and the measured instantaneous interfacial tensions are 2.53 mN / min and 2.87 mN / min, respectively.

[0098] From the above data, we can see that under the same conditions of temperature and pressure, the lighter the alkane, that is, the fewer carbon atoms it contains, the smaller the interfacial tension between carbon dioxide and the alkane, and the two are negatively correlated.

[0099] Furthermore, the oil well productivity and the overall development effect and law of tight oil reservoirs can be analyzed based on the relationship between the type of the first substance and the interfacial tension.

[0100] An embodiment of the present invention provides a method for determining the instantaneous interfacial tension of a mixed phase system, wherein the method comprises the steps of increasing the confining pressure of a high-pressure clamp that clamps a Hele-Shaw model to a first preset pressure, and increasing the temperature of the high-pressure clamp to a preset temperature; respectively injecting at least two types of first substances having a first viscosity and a second substance having a second viscosity into the Hele-Shaw model from an inlet end of the high-pressure clamp in sequence at a preset injection speed, and maintaining the pressure at the outlet end of the high-pressure clamp at a second preset pressure through a back pressure valve connected to the outlet end of the high-pressure clamp during the injection of the second substance; wherein the number of carbon atoms contained in each type of the first substance is different, the first viscosity is greater than the second viscosity, and the first preset pressure is greater than the second preset pressure; after the first substance is injected, the injection time of the second substance is recorded, and the number of finger-like protrusions formed by the second substance in the first substance corresponding to the injection time is determined; the instantaneous interfacial tension is determined according to the first viscosity, the second viscosity, the injection time, the preset injection speed, the number of finger-like protrusions, the injection hole size of the Hele-Shaw model, and the spacing of the Hele-Shaw model; the corresponding relationship between the type of each first substance and the instantaneous interfacial tension corresponding to the type of the first substance is determined. This technical solution provides data support for the oil well productivity and the overall development effect and law of tight oil reservoirs by determining the law between the type of the first substance and the instantaneous interfacial tension.

[0101] Embodiment 4

[0102] Figure 5 This is a schematic diagram of a structure of a device for determining the instantaneous interfacial tension of a mixed phase system provided in Example 4 of the present application. Figure 5 As shown, the device comprises:

[0103] A high-temperature and high-pressure environment setting module 410 is used to increase the confining pressure of a high-pressure clamp holding the Hele-Shaw model to a first preset pressure, and to increase the temperature of the high-pressure clamp to a preset temperature;

[0104] A miscible displacement process simulation module 420, for sequentially injecting a first substance having a first viscosity and a second substance having a second viscosity from the inlet end of the high-pressure clamp into the Hele-Shaw model at a preset injection speed, and during the injection of the second substance, maintaining the pressure at the outlet end of the high-pressure clamp at a second preset pressure through a back pressure valve connected to the outlet end of the high-pressure clamp; wherein the first viscosity is greater than the second viscosity, and the first preset pressure is greater than the second preset pressure;

[0105] The finger-like protrusion quantity determination module 430 is used to record the injection time of the second substance after the injection of the first substance is completed, and determine the number of finger-like protrusions formed by the second substance in the first substance corresponding to the injection time;

[0106] The instantaneous interfacial tension determination module 440 is used to determine the instantaneous interfacial tension according to the first viscosity, the second viscosity, the injection time, the preset injection speed, the number of finger-like protrusions, the injection hole size of the Hele-Shaw model and the spacing of the Hele-Shaw model.

[0107] The embodiment of the present invention provides a device for determining the instantaneous interfacial tension of a mixed phase system, the device increases the confining pressure of a high-pressure clamp holding a Hele-Shaw model to a first preset pressure, and increases the temperature of the high-pressure clamp to a preset temperature; injects a first substance with a first viscosity and a second substance with a second viscosity into the Hele-Shaw model from the inlet end of the high-pressure clamp in sequence according to a preset injection speed, and during the injection of the second substance, maintains the outlet end pressure of the high-pressure clamp at the second preset pressure through a back pressure valve connected to the outlet end of the high-pressure clamp; records the injection time of the second substance and determines the number of finger-like protrusions formed by the second substance in the first substance corresponding to the injection time; determines the instantaneous interfacial tension according to the first viscosity, the second viscosity, the injection time, the preset injection speed, the number of finger-like protrusions, the injection hole size of the Hele-Shaw model, and the spacing of the Hele-Shaw model. This technical solution, using the viscous fingering phenomenon, can simply and easily determine the instantaneous interfacial tension of a mixed phase system.

[0108] Furthermore, the miscible displacement process simulation module 420 includes:

[0109] A first material injection unit, used for injecting a first material having a first viscosity into the Hele-Shaw model from an inlet end of the high-pressure clamp at a preset injection speed, and adjusting the pressure at the outlet end of the high-pressure clamp to a second preset pressure through a back pressure valve connected to the outlet end of the high-pressure clamp;

[0110] The second material injection unit is used to inject a second material with a second viscosity into the Hele-Shaw model from the inlet end of the high-pressure clamp at a preset injection speed, and during the injection of the second material, the pressure at the outlet end of the high-pressure clamp is maintained at a second preset pressure through a back pressure valve connected to the outlet end of the high-pressure clamp.

[0111] Furthermore, the high temperature and high pressure environment setting module 410 includes:

[0112] A high-pressure environment setting unit, used for adjusting the confining pressure of the high-pressure holder for holding the Hele-Shaw model to a first preset pressure through a horizontal flow pump connected to an inlet end of the high-pressure holder for holding the Hele-Shaw model;

[0113] The high temperature environment setting unit is used to raise the temperature of the high voltage clamp to a preset temperature through a heater in the high voltage clamp.

[0114] Furthermore, the finger-like protrusion quantity determination module 430 includes:

[0115] a target image acquisition unit, used to detect the Hele-Shaw model through a microscope to acquire a target image of the Hele-Shaw model during the injection process;

[0116] The finger-like protrusion quantity determination unit is used to determine the number of finger-like protrusions formed by the second substance in the first substance corresponding to the injection duration according to the target image.

[0117] Furthermore, the instantaneous interfacial tension determination module 440 is specifically used to:

[0118] The instantaneous interfacial tension is determined using the following formula:

[0119]

[0120] Among them, n A is the number of finger-like protrusions, r0 is the injection hole radius of the Hele-Shaw model, V is the preset injection speed, t is the injection time, m is the spacing of the Hele-Shaw model, η1 is the first viscosity, η2 is the second viscosity, σ is the instantaneous interfacial tension, and a, b and c are constants.

[0121] Furthermore, the high temperature and high pressure environment setting module 410 includes:

[0122] A high temperature and high pressure environment setting unit, used to respectively increase the confining pressure of the high pressure clamp holding the Hele-Shaw model to at least two first preset pressures; wherein the values ​​of the first preset pressures are different;

[0123] Accordingly, the device further comprises:

[0124] The high-pressure environment influence degree determination module is used to determine the corresponding relationship between the first preset pressure and the instantaneous interface tension according to each of the first preset pressures and the instantaneous interface tension corresponding to each of the first preset pressures after determining the instantaneous interface tension.

[0125] Furthermore, the miscible displacement process simulation module 420 includes:

[0126] A miscible displacement process simulation unit, used for respectively injecting at least two types of first substances with a first viscosity and a second substance with a second viscosity into the Hele-Shaw model in sequence from the inlet end of the high-pressure holder at a preset injection speed; wherein the number of carbon atoms contained in each type of the first substance is different;

[0127] Accordingly, the device further comprises:

[0128] The substance type influence degree determination module is used to determine the corresponding relationship between the type of the first substance and the instantaneous interfacial tension according to the type of each of the first substances and the instantaneous interfacial tension corresponding to the type of the first substance after determining the instantaneous interfacial tension.

[0129] A device for determining the instantaneous interfacial tension of a mixed-phase system provided in an embodiment of the present application can execute a method for determining the instantaneous interfacial tension of a mixed-phase system provided in any embodiment of the present application, and has functional modules and beneficial effects corresponding to the execution method.

[0130] Embodiment 5

[0131] Figure 6 A schematic diagram of a device 10 that can be used to implement an embodiment of the present application is shown. The device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workbenches, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The device can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present application described and / or required herein.

[0132] like Figure 6 As shown, the device 10 includes at least one processor 11, and a memory connected to the at least one processor 11, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., wherein the memory stores a computer program that can be executed by at least one processor, and the processor 11 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or the computer program loaded from the storage unit 18 to the random access memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the device 10 can also be stored. The processor 11, ROM 12 and RAM 13 are connected to each other through a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0133] A number of components in the device 10 are connected to the I / O interface 15, including: an input unit 16, such as a keyboard, a mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a disk, an optical disk, etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the device 10 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks.

[0134] The processor 11 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, digital signal processors (DSPs), and any appropriate processors, controllers, microcontrollers, etc. The processor 11 executes the various methods and processes described above, such as a method for determining the instantaneous interfacial tension of a mixed phase system.

[0135] In some embodiments, the method for determining the instantaneous interfacial tension of a mixed phase system may be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as a storage unit 18. In some embodiments, part or all of the computer program may be loaded and / or installed on the device 10 via the ROM 12 and / or the communication unit 19. When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more steps of the method for determining the instantaneous interfacial tension of a mixed phase system described above may be performed. Alternatively, in other embodiments, the processor 11 may be configured to execute the method for determining the instantaneous interfacial tension of a mixed phase system in any other appropriate manner (e.g., by means of firmware).

[0136] Various implementations of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various implementations can include: being implemented in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0137] The computer programs for implementing the methods of the present application may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that when the computer programs are executed by the processor, the functions / operations specified in the flow charts and / or block diagrams are implemented. The computer programs may be executed entirely on the machine, partially on the machine, partially on the machine and partially on a remote machine as a stand-alone software package, or entirely on a remote machine or server.

[0138] In the context of the present application, a computer readable storage medium may be a tangible medium that may contain or store a computer program for use by or in conjunction with an instruction execution system, device or equipment. A computer readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, a computer readable storage medium may be a machine readable signal medium. A more specific example of a machine readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0139] To provide interaction with a user, the systems and techniques described herein can be implemented on a device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and a pointing device (e.g., a mouse or trackball) through which the user can provide input to the device. Other types of devices can also be used to provide interaction with the user; for example, the feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including acoustic input, voice input, or tactile input).

[0140] The systems and techniques described herein may be implemented in a computing system that includes backend components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes frontend components (e.g., a user computer with a graphical user interface or a web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such backend components, middleware components, or frontend components. The components of the system may be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0141] A computing system may include a client and a server. The client and the server are generally remote from each other and usually interact through a communication network. The client and server relationship is generated by computer programs running on the corresponding computers and having a client-server relationship with each other. The server may be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system to solve the defects of difficult management and weak business scalability in traditional physical hosts and VPS services.

[0142] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps recorded in this application can be executed in parallel, sequentially or in different orders, as long as the expected results of the technical solution of this application can be achieved, and this document is not limited here.

[0143] The above specific implementations do not constitute a limitation on the protection scope of this application. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of this application should be included in the protection scope of this application.

Claims

1. A method for determining the instantaneous interfacial tension of a mixed phase system, characterized in that: The method comprises: Raising the confining pressure of a high-pressure holder holding the Hele-Shaw model to a first preset pressure, and raising the temperature of the high-pressure holder to a preset temperature; Injecting a first substance having a first viscosity and a second substance having a second viscosity into the Hele-Shaw model from the inlet end of the high-pressure clamp in sequence at a preset injection speed, and maintaining the pressure at the outlet end of the high-pressure clamp at a second preset pressure through a back pressure valve connected to the outlet end of the high-pressure clamp during the injection of the second substance; wherein the first viscosity is greater than the second viscosity, and the first preset pressure is greater than the second preset pressure; After the injection of the first substance is completed, recording the injection time of the second substance, and determining the number of finger-like protrusions formed by the second substance in the first substance corresponding to the injection time; The instantaneous interfacial tension is determined according to the first viscosity, the second viscosity, the injection time, the preset injection speed, the number of finger-like protrusions, the injection hole size of the Hele-Shaw model and the spacing of the Hele-Shaw model.

2. The method according to claim 1, characterized in that Injecting a first substance having a first viscosity and a second substance having a second viscosity into the Hele-Shaw model in sequence from an inlet end of the high-pressure holder at a preset injection speed, comprising: Injecting a first substance having a first viscosity into the Hele-Shaw model from the inlet end of the high-pressure holder at a preset injection speed, and adjusting the pressure at the outlet end of the high-pressure holder to a second preset pressure through a back pressure valve connected to the outlet end of the high-pressure holder; A second substance having a second viscosity is injected into the Hele-Shaw model from the inlet end of the high-pressure clamp at a preset injection speed, and during the injection of the second substance, the pressure at the outlet end of the high-pressure clamp is maintained at a second preset pressure through a back pressure valve connected to the outlet end of the high-pressure clamp.

3. The method according to claim 1, characterized in that Raising the confining pressure of a high-pressure holder holding the Hele-Shaw model to a first preset pressure, and raising the temperature of the high-pressure holder to a preset temperature, comprising: By means of a horizontal flow pump connected to an inlet end of a high-pressure holder for holding the Hele-Shaw model, a confining pressure of the high-pressure holder for holding the Hele-Shaw model is adjusted to rise to a first preset pressure; The temperature of the high-voltage clamp is raised to a preset temperature by a heater in the high-voltage clamp.

4. The method according to claim 1, characterized in that: Determining the number of finger-like protrusions formed by the second substance in the first substance corresponding to the injection duration includes: Detecting the Hele-Shaw model through a microscope to obtain a target image of the Hele-Shaw model during the injection process; The number of finger-like protrusions formed by the second substance in the first substance corresponding to the injection duration is determined according to the target image.

5. The method according to claim 1, characterized in that Determining instantaneous interfacial tension according to the first viscosity, the second viscosity, the injection time, the preset injection speed, the number of finger-like protrusions, the injection hole size of the Hele-Shaw model, and the spacing of the Hele-Shaw model includes: The instantaneous interfacial tension is determined using the following formula: Among them, n A is the number of finger-like protrusions, r0 is the injection hole radius of the Hele-Shaw model, V is the preset injection speed, t is the injection time, m is the spacing of the Hele-Shaw model, η1 is the first viscosity, η2 is the second viscosity, σ is the instantaneous interfacial tension, and a, b and c are constants.

6. The method according to claim 1, characterized in that The confining pressure of the high pressure holder holding the Hele-Shaw model is increased to a first preset pressure, including: Raising the confining pressure of the high-pressure clamp holding the Hele-Shaw model to at least two first preset pressures respectively; wherein the values ​​of the first preset pressures are different; Accordingly, after determining the instantaneous interfacial tension, the method further comprises: According to each of the first preset pressures and the instantaneous interfacial tension corresponding to each of the first preset pressures, a corresponding relationship between the first preset pressures and the instantaneous interfacial tension is determined.

7. The method according to claim 1, characterized in that Injecting a first substance having a first viscosity and a second substance having a second viscosity into the Hele-Shaw model in sequence from an inlet end of the high-pressure holder at a preset injection speed, comprising: Injecting at least two types of first substances with a first viscosity and a second substance with a second viscosity into the Hele-Shaw model in sequence from the inlet end of the high-pressure holder at a preset injection speed; wherein the number of carbon atoms contained in each type of the first substance is different; Accordingly, after determining the instantaneous interfacial tension, the method further comprises: According to the type of each of the first substances and the instantaneous interfacial tension corresponding to the type of the first substance, a corresponding relationship between the type of the first substance and the instantaneous interfacial tension is determined.

8. A device for determining instantaneous interfacial tension of a mixed phase system, characterized in that: The device comprises: A high-temperature and high-pressure environment setting module, used to increase the confining pressure of a high-pressure holder for holding the Hele-Shaw model to a first preset pressure, and to increase the temperature of the high-pressure holder to a preset temperature; A miscible displacement process simulation module, used for sequentially injecting a first substance with a first viscosity and a second substance with a second viscosity from the inlet end of the high-pressure clamp into the Hele-Shaw model at a preset injection speed, and during the injection of the second substance, maintaining the pressure at the outlet end of the high-pressure clamp at a second preset pressure through a back pressure valve connected to the outlet end of the high-pressure clamp; wherein the first viscosity is greater than the second viscosity, and the first preset pressure is greater than the second preset pressure; a finger-like protrusion quantity determination module, configured to record the injection time of the second substance after the injection of the first substance is completed, and determine the number of finger-like protrusions formed by the second substance in the first substance corresponding to the injection time; The instantaneous interfacial tension determination module is used to determine the instantaneous interfacial tension according to the first viscosity, the second viscosity, the injection time, the preset injection speed, the number of finger-like protrusions, the injection hole size of the Hele-Shaw model and the spacing of the Hele-Shaw model.

9. An electronic device, characterized in that: The device comprises: at least one processor; and a memory communicatively connected to the at least one processor; wherein, The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can perform the method for determining the instantaneous interfacial tension of a mixed-phase system according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the method for determining the instantaneous interfacial tension of a mixed-phase system according to any one of claims 1 to 7 when executed.

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