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

Abstract

The present application discloses a method, device, equipment and medium for determining the instantaneous interfacial tension of a mixed-phase system. Among them, the scheme raises the confining pressure of a high-pressure holder that clamps a Hele-Shaw model to a first preset pressure, and raises the temperature of the high-pressure holder 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 holder 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 holder at the second preset pressure through a back-pressure valve connected to the outlet end of the high-pressure holder; 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 based on the first viscosity, the second viscosity, the injection time, the preset injection speed, the number of finger-like protrusions, the injection hole size and the spacing of the Hele-Shaw model. This technical solution can simply and easily determine the instantaneous interfacial tension of a mixed-phase system.

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 miscible system. Background Art

[0002] As conventional oil and gas reservoirs become increasingly depleted, the importance of tight oil and gas resources is becoming increasingly apparent. However, due to the low microscopic pore size and high pore-throat ratio of tight oil and gas resources, conventional water injection is insufficient to meet the development needs of these reservoir types. Against this backdrop, miscible flooding technologies, such as the injection of gases like CO2 and natural gas, have become a key technology for developing these reservoirs.

[0003] In oil and gas reservoirs, miscibility is defined as the ability of two or more fluids to mix in any proportion to form a single phase. This refers to the state of miscibility achieved when the interfacial tension between the two or more phases is zero. The key to miscible flooding technology is determining the instantaneous interfacial tension of the miscible system. Currently, this is typically determined using theoretical calculations or experimental testing. Theoretical calculations are not very accurate, while experimental testing methods such as capillary tube experiments, rising bubble instruments, or the interfacial tension vanishing method require high equipment and testing costs. Furthermore, under high pressure, the influence of interphase mass transfer makes the measurement of instantaneous interfacial tension difficult, making it difficult to meet the testing requirements. This leads to a lack of understanding of the microscopic seepage mechanisms of miscible systems, creating difficulties and risks in the practical application 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 the 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 sequentially from the inlet of the high-pressure holder at a preset injection rate, and maintaining the pressure at the outlet of the high-pressure holder at a second preset pressure via a back-pressure valve connected to the outlet of the high-pressure holder 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 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 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 the instantaneous interfacial tension of a mixed phase system is provided, the device comprising:

[0012] a high-temperature and high-pressure environment setting module, configured to increase the confining pressure of a high-pressure holder 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, configured to sequentially inject a first substance having a first viscosity and a second substance having a second viscosity into the Hele-Shaw model from the inlet of the high-pressure holder at a preset injection rate, and to maintain the pressure at the outlet of the high-pressure holder at a second preset pressure via a back-pressure valve connected to the outlet of the high-pressure holder 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;

[0014] a finger-like protrusion number determination module, configured to, after the first substance is injected, record the injection duration 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 duration;

[0015] and a transient interfacial tension determination module, configured to determine the transient interfacial tension based on the first viscosity, the second viscosity, the injection duration, 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 the 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 as follows: the confining pressure of a high-pressure holder holding a Hele-Shaw model is increased to a first preset pressure, and the temperature of the high-pressure holder is increased to a preset temperature; a first substance having a first viscosity and a second substance having a second viscosity are sequentially injected into the Hele-Shaw model from the inlet of the high-pressure holder at a preset injection rate; during the injection of the second substance, the outlet pressure of the high-pressure holder is maintained at the second preset pressure by a back-pressure valve connected to the outlet of the high-pressure holder; 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; and the instantaneous interfacial tension is determined based on the first viscosity, the second viscosity, the injection time, the preset injection rate, 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, utilizing 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 following briefly introduces the drawings required for use in the description of the embodiments. 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 any creative work.

[0024] Figure 1 This 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;

[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 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;

[0027] 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;

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

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

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

[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 variations thereof 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 clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0032] Example 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 performed 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 holder holding the Hele-Shaw model to a first preset pressure, and raising the temperature of the high-pressure holder to a preset temperature.

[0035] When a low-viscosity fluid displaces a high-viscosity fluid, Saffman-Taylor instability occurs in the Hele-Shaw model. In an embodiment of the present invention, a test device is constructed 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 actual reservoir environment for the Hele-Shaw model. The confining pressure simulates the pressure exerted on the rock by the surrounding rock mass. The first preset pressure and temperature can be determined based on actual conditions. For example, the first preset pressure can be 9 MPa, and the preset temperature can be 50°C.

[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: regulating 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, and the confining pressure of the high-pressure holder, which holds the Hele-Shaw model, can be increased via a horizontal flow pump connected to the inlet of the high-pressure holder. After reaching a first preset pressure, the temperature of the high-pressure holder is raised to a preset temperature via a temperature control module within the high-pressure holder. During the temperature increase process, the horizontal flow pump can be used to continuously control the confining pressure of the high-pressure holder to stabilize at the first preset pressure. The beneficial effect of this technical solution is that it provides a high-temperature and high-pressure environment for the transient interfacial tension of the mixed-phase system, thereby making the test results 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 compressed air may be used to blow dry the above equipment 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 sequentially from the inlet of the high-pressure clamp at a preset injection rate. During the injection of the second substance, maintaining the pressure at the outlet of the high-pressure clamp at a second preset pressure via a back-pressure valve connected to the outlet 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 can be stored in an intermediate container in advance. After the 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 the 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 injected into the Hele-Shaw model in sequence from the inlet end of the high-pressure holder 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 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; injecting the second substance with a second viscosity into the Hele-Shaw model from the inlet end of the high-pressure holder at a preset injection speed, and maintaining the pressure at the outlet end of the high-pressure holder at the second preset pressure through a back pressure valve connected to the outlet end of the high-pressure holder during the injection of the second substance.

[0046] In the Hele-Shaw model, Saffman-Taylor instability occurs only when a fluid with lower viscosity displaces a fluid with higher viscosity. Therefore, a first substance with higher viscosity can be injected into the Hele-Shaw model from the inlet of the high-pressure holder at a preset injection rate, followed by a second substance with lower viscosity, also at a preset injection rate.

[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, 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.

[0049] Due to the difference in viscosity between the first substance and the second substance, the front edge of the displacing phase fluid easily penetrates 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 lower viscosity. The number of finger-like protrusions can be determined by collecting images of the Hele-Shaw model after injection using an image collector.

[0051] Specifically, the second substance is injected after the first substance is injected, and the time when the second substance injection starts is used as the initial time; an image of the Hele-Shaw model is obtained through an image collector, and the time when the image is obtained is used as the injection time; and the difference between the injection time and the initial time is used 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 can be installed directly above the Hele-Shaw model. The microscope is connected to a video display computer. The microscope is controlled to align with the Hele-Shaw model to acquire an image. The acquired target image can be displayed on the video display computer.

[0054] Furthermore, the number of finger-like protrusions can be determined based on the target image. A technician can observe the number of finger-like protrusions in the target image and input it into the program for determining the instantaneous interfacial tension of the mixed system. Alternatively, a finger-like protrusion number determination model can be trained in advance 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 finger-like protrusion number determination model.

[0055] S140. Determine instantaneous interfacial tension according to the first viscosity, the second viscosity, the injection duration, 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 Saffman-Taylor instability occurs, a mathematical relationship exists between the first viscosity, the second viscosity, the injection duration, the preset injection rate, the number of finger-like protrusions, the injection hole size in the Hele-Shaw model, the spacing between the Hele-Shaw model, and the instantaneous interfacial tension. This mathematical relationship can be used to determine the instantaneous interfacial tension.

[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 velocity, 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] The first viscosity η1 is determined differently depending on the properties of the first substance. 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 The injection hole radius r0 and spacing m of the Hele-Shaw model can be determined in step S130. The injection hole radius r0 and spacing m can be determined by the pre-set parameters of the Hele-Shaw model. The preset injection speed V can be the speed set by the plunger pump that provides the injection power. The first viscosity η1 and the second viscosity η2 can be obtained by pre-testing the viscosity. a, b, and c can be determined based on experimental experience. Furthermore, the instantaneous interfacial tension can be determined using 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 is used to determine 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] In the second step, 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 the CO2 and hydrocarbon substances are respectively connected to the inlet end of the high-pressure holder 4;

[0066] Step 3: Figure 2 After the connected devices are evacuated, the confining pressure of the high-pressure holder 4 holding the Hele-Shaw model 5 is increased to a first preset pressure 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 using the first plunger pump 2;

[0067] Step 4: After the hydrocarbons are fully saturated, continue injecting hydrocarbons, 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 rate, and use the microscope 6 to inspect the Hele-Shaw model 5. The video display computer 1 connected to the microscope 6 obtains an observation image and records the injection duration. The light source 12 is used to provide illumination for the microscope 6 to prevent the observation image obtained by the video display computer 1 from being unclear.

[0069] Step 6. Determine the instantaneous interfacial tension based on the viscosity of the hydrocarbon material, the viscosity of CO2, the injection time, the preset injection rate, the number of finger-like protrusions in the observation 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, the method comprising: 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 with a first viscosity and a second substance with a second viscosity into the Hele-Shaw model in sequence from an inlet end of the high-pressure clamp at a preset injection speed, and maintaining the outlet pressure of the high-pressure clamp at a second preset pressure through 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 based on 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 uses 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 measurement of the interfacial tension between different media. First, this solution can realize the measurement of interfacial tension under different temperature and pressure conditions, ensuring that the measurement results are more consistent 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 phase media with interphase mass transfer, thereby providing technical support for quantitatively determining the size distribution of capillary forces in the non-miscible phase carbon dioxide / natural gas-crude oil system and quantitatively describing the microscopic seepage laws. Finally, this solution has low requirements for the required test equipment, low cost of establishing the measurement system, and strong scalability.

[0071] Example 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 this 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 increasing the confining pressure of the high-pressure clamp holding the Hele-Shaw model to at least two first preset pressures, and increasing 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 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, hexadecane is displaced by carbon dioxide at a preset temperature of 25° C., and 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 in sequence from the inlet of the high-pressure clamp at a preset injection rate. During the injection of the second substance, the pressure at the outlet of the high-pressure clamp is maintained at a second preset pressure by a back-pressure valve connected to the outlet 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: Determine 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 correspondence between the first preset pressures and the instantaneous interfacial tensions according to the first preset pressures and the instantaneous interfacial tensions corresponding to 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 also be determined based on whether the correlation is positive or negative.

[0082] For example, 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. The measured instantaneous interfacial tensions are 9.2 mN / min, 6.88 mN / min, and 4.58 mN / min, respectively.

[0084] From the above data, it can be seen 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 rules 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 holder holding a Hele-Shaw model to at least two first preset pressures, and raising the temperature of the high-pressure holder to a preset temperature; wherein the values ​​of the first preset pressures are different; injecting a first substance having a first viscosity and a second substance having a second viscosity into the Hele-Shaw model from an inlet of the high-pressure holder in sequence at a preset injection rate; and maintaining the pressure at the outlet of the high-pressure holder at a second preset pressure via a back pressure valve connected to an outlet of the high-pressure holder during 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; 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 based on the first viscosity, the second viscosity, the injection time, the preset injection rate, the number of finger-like protrusions, the injection hole size of the Hele-Shaw model, and the spacing of the Hele-Shaw model; and determining the corresponding relationship between the first preset pressure and the instantaneous interfacial tension based on 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] Example 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 this 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: Raise the confining pressure of the high-pressure holder holding the Hele-Shaw model to a first preset pressure, and raise the temperature of the high-pressure holder 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 of the high-pressure clamp at a preset injection rate. During the injection of the second substances, maintain the pressure at the outlet of the high-pressure clamp at a second preset pressure via a back-pressure valve connected to the outlet 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, different types of first substances can be displaced by using the same type of second substance 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., decane and dodecane are displaced respectively by carbon dioxide.

[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: Determine instantaneous interfacial tension based on the first viscosity, the second viscosity, the injection duration, 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 first substance 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 performing data fitting on 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 and the instantaneous interfacial tension of the first substance can be determined to be positive or negative.

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

[0098] From the above data, it can be seen 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 rules 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 following steps: raising the confining pressure of a high-pressure holder holding a Hele-Shaw model to a first preset pressure, and raising the temperature of the high-pressure holder 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 holder in sequence at a preset injection rate; during the injection of the second substance, maintaining the pressure at the outlet end of the high-pressure holder at the second preset pressure through a back pressure valve connected to the outlet end of the high-pressure holder; 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 based on 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; based on the type of each first substance and the instantaneous interfacial tension corresponding to the type of the first substance, the corresponding relationship between the type of the first substance and the instantaneous interfacial tension is determined. This technical solution provides data support for the productivity of oil wells 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] Example 4

[0102] Figure 5 This is a schematic diagram 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 includes:

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

[0104] a miscible displacement process simulation module 420 for sequentially injecting a first material having a first viscosity and a second material having a second viscosity from the inlet of the high-pressure holder into the Hele-Shaw model at a preset injection rate, wherein during the injection of the second material, a back pressure valve connected to the outlet of the high-pressure holder is used to maintain the pressure at the outlet of the high-pressure holder at a second preset pressure; wherein the first viscosity is greater than the second viscosity, and the first preset pressure is greater than the second preset pressure;

[0105] a finger-like protrusion number determination module 430 for recording the injection duration of the second substance after the first substance is injected, and determining the number of finger-like protrusions formed by the second substance in the first substance corresponding to the injection duration;

[0106] The instantaneous interfacial tension determination module 440 is used to determine the instantaneous interfacial tension based on 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] An 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 holder holding a Hele-Shaw model to a first preset pressure and increases the temperature of the high-pressure holder to a preset temperature; sequentially injects a first substance having a first viscosity and a second substance having a second viscosity into the Hele-Shaw model from an inlet of the high-pressure holder at a preset injection rate; during the injection of the second substance, a back-pressure valve connected to an outlet of the high-pressure holder maintains the outlet pressure of the high-pressure holder at the second preset pressure; 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; and determines the instantaneous interfacial tension based on the first viscosity, the second viscosity, the injection time, the preset injection rate, 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, utilizing 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 substance injection unit, configured to inject a first substance having a first viscosity into the Hele-Shaw mold from an inlet of the high-pressure holder at a preset injection rate, and to adjust the pressure at the outlet of the high-pressure holder to a second preset pressure via a back-pressure valve connected to the outlet of the high-pressure holder;

[0110] A second material injection unit is used to inject a second material having 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, a back pressure valve connected to the outlet end of the high-pressure clamp is used to maintain the pressure at the outlet end of the high-pressure clamp at a second preset pressure.

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

[0112] a high-pressure environment setting unit, configured to adjust the confining pressure of the high-pressure holder 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 holding the Hele-Shaw model;

[0113] The high temperature environment setting unit is used to increase 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 number determination module 430 includes:

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

[0116] The finger-like protrusion number determining unit is configured to determine, 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.

[0117] Furthermore, the instantaneous interfacial tension determination module 440 is specifically configured 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 velocity, 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, configured to respectively increase the confining pressure of a high-pressure holder 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 impact degree determination module is used to determine 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 after determining the instantaneous interfacial tension.

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

[0126] a miscible displacement process simulation unit, configured to sequentially inject 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 of the high-pressure holder at a preset injection rate; wherein each type of the first substance contains a different number of carbon atoms;

[0127] Accordingly, the device further comprises:

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

[0129] An apparatus 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] Example 5

[0131] Figure 6 A schematic diagram of the structure of an apparatus 10 that can be used to implement an embodiment of the present application is shown. The apparatus is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The apparatus 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, device 10 includes at least one processor 11 and a memory, such as a read-only memory (ROM) 12 and a random access memory (RAM) 13, communicatively connected to the at least one processor 11. The memory stores a computer program executable by the at least one processor, and processor 11 can perform various appropriate actions and processes based on the computer program stored in the read-only memory (ROM) 12 or loaded from storage unit 18 into the random access memory (RAM) 13. RAM 13 can also store various programs and data required for the operation of device 10. Processor 11, ROM 12, and RAM 13 are interconnected via a bus 14. An input / output (I / O) interface 15 is also connected to bus 14.

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

[0134] The processor 11 can be various general-purpose and / or specialized 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, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 11 executes the various methods and processes described above, such as the 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 can 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 can 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 can be performed. Alternatively, in other embodiments, the processor 11 can be configured to execute the method for determining the instantaneous interfacial tension of a mixed-phase system by any other appropriate means (e.g., by means of firmware).

[0136] Various embodiments of the systems and techniques described 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), system-on-chip systems (SOCs), programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments can include being implemented in one or more computer programs that are executable and / or interpreted on a programmable system that includes 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] 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, such that when the computer program is executed by the processor, the functions / operations specified in the flowcharts and / or block diagrams are implemented. The computer program may be executed entirely on the machine, partially on the machine, as a stand-alone software package, partially on the machine and partially on a remote machine, or entirely on a remote machine or server.

[0138] In the context of the present application, a computer-readable storage medium can be a tangible medium that can contain or store a computer program for use by an instruction execution system, device or equipment or used in combination with an instruction execution system, device or equipment. A computer-readable storage medium can 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 can be a machine-readable signal medium. A more specific example of a machine-readable storage medium can 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 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 can be implemented in a computing system that includes back-end 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 front-end components (e.g., a user computer with a graphical user interface or 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 back-end components, middleware components, or front-end components. The components of the system can 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 clients and servers. The clients and servers are typically remote from each other and typically interact via a communication network. This client-server relationship arises through computer programs running on the respective computers, creating a client-server relationship. The server may be a cloud server, also known as a cloud computing server or cloud host. This server is a hosting product within the cloud computing service ecosystem that addresses the management difficulties and limited scalability of traditional physical hosting and VPS services.

[0142] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in this application can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of this application can be achieved. This is not limited herein.

[0143] The above specific embodiments do not constitute a limitation on the scope of protection of this application. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application shall be included within the scope of protection 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 sequentially from the inlet of the high-pressure holder at a preset injection rate, and maintaining the pressure at the outlet of the high-pressure holder at a second preset pressure via a back-pressure valve connected to the outlet of the high-pressure holder 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 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 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 rate, comprising: Injecting a first substance having a first viscosity into the Hele-Shaw mold from an inlet of the high-pressure holder at a preset injection rate, and adjusting the pressure at the outlet of the high-pressure holder to a second preset pressure via a back-pressure valve connected to the outlet of the high-pressure holder; A second substance having a second viscosity is injected into the Hele-Shaw mold from the inlet end of the high-pressure holder at a preset injection rate, and during the injection of the second substance, the pressure at the outlet end of the high-pressure holder is maintained at a second preset pressure by a back pressure valve connected to the outlet end of the high-pressure holder.

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: regulating the confining pressure of the high-pressure holder holding the Hele-Shaw model to a first preset pressure by a horizontal flow pump connected to an inlet end of the high-pressure holder holding the Hele-Shaw model; The temperature of the high-voltage holder is raised to a preset temperature by a heater in the high-voltage holder.

4. The method according to claim 1, wherein 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, wherein 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 velocity, 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 Raising the confining pressure of the high-pressure holder holding the Hele-Shaw model to a first preset pressure includes: 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: A corresponding relationship between the first preset pressure and the instantaneous interfacial tension is determined according to each of the first preset pressures and the instantaneous interfacial tension corresponding to each of the first preset pressures.

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 rate, comprising: 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 sequentially from an inlet end of the high-pressure holder at a preset injection rate; wherein each type of the first substance contains a different number of carbon atoms; Accordingly, after determining the instantaneous interfacial tension, the method further comprises: According to the type of each first substance 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 the instantaneous interfacial tension of a mixed phase system, characterized in that: The device comprises: a high-temperature and high-pressure environment setting module, configured to increase the confining pressure of a high-pressure holder 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, configured to sequentially inject a first substance having a first viscosity and a second substance having a second viscosity into the Hele-Shaw model from the inlet of the high-pressure holder at a preset injection rate, and to maintain the pressure at the outlet of the high-pressure holder at a second preset pressure via a back-pressure valve connected to the outlet of the high-pressure holder 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; a finger-like protrusion number determination module, configured to, after the first substance is injected, record the injection duration 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 duration; and a transient interfacial tension determination module, configured to determine the transient interfacial tension based on the first viscosity, the second viscosity, the injection duration, 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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