Device and method for simulating competitive dissolution characteristics of injected gas in oil-water mixed environment

Abstract

The present invention discloses a device and method for simulating the competitive dissolution characteristics of injected gas in an oil-water mixed environment, comprising: a temperature-adjustable test chamber with a bracket mounted on the bottom; an autoclave fixed to the bracket, an exhaust assembly within the autoclave, and a stirring assembly mounted on the top of the autoclave; a fluid injection system comprising a gas container, a formation water container, and a formation crude oil container, all of which are connected to a pressure assembly; a flash evaporation system disposed within the temperature-adjustable test chamber, with a plurality of fluid outlets vertically defined on the side of the autoclave, the flash evaporation system being respectively connected to the fluid outlets on the side of the autoclave; a data acquisition system comprising a data acquisition unit and a terminal system; and an air outlet disposed on the top of the autoclave, with a valve mounted on the air outlet. The present invention can simulate the dissolution characteristics of injected gas in an oil-water mixed environment at different stages of the reservoir development process, effectively guiding actual on-site production.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas development, and in particular to a device and method for simulating competitive dissolution characteristics of injected gas in an oil-water mixed environment. Background Art

[0002] As the most widely used and consumed energy source, oil is the lifeblood of modern industry. Oil resources are widely used across all industries and have long been a part of people's daily lives. They are also an indispensable strategic resource for national survival and development, playing a vital role in safeguarding national economic and social development, and even national defense. However, oil is a non-renewable energy source with limited reserves, making it crucial to maximize the recovery of oil resources stored in strata. Low-permeability reservoirs currently account for a significant portion of my country's proven oil reserves. However, these reservoirs have low permeability, making them difficult to effectively exploit. Consequently, technologies to improve the recovery rate of low- and ultra-low-permeability oil reservoirs have garnered significant attention.

[0003] Currently, mature technologies for developing low-permeability reservoirs include water injection, gas injection, and fracturing. Gas injection is considered the most effective method for enhancing oil recovery in low- and ultra-low-permeability reservoirs. Once injected, gas partially dissolves in the crude oil, improving its fluidity and causing its volume to expand, while also driving the oil to increase oil recovery. CO2, due to its strongest solubility in crude oil, offers the best oil recovery. CO2 flooding also allows for the sequestration of the greenhouse gas CO2. In addition to crude oil, oil reservoirs also contain bound water. CO2 has different solubility in different phases, and the coexistence of oil and water can affect gas dissolution. Especially for oil reservoirs that are further gas-flooded after water flooding, the initial water content is high, and the competitive solubility of CO2 in the oil and water phases will be more different. The existing technology lacks a simulation device for the solubility characteristics of injected gas in crude oil and water during gas injection and oil production in original oil reservoirs and oil reservoirs after water flooding development, the solubility of injected gas in different phases in an environment where oil and water coexist, and the composition change law after the injected gas dissolution equilibrium. Based on this, the present invention provides a simulation device and method for the competitive solubility characteristics of injected gas in an oil-water mixed environment. Summary of the Invention

[0004] The purpose of the present invention is to provide a device and method for simulating the competitive dissolution characteristics of injected gas in an oil-water mixed environment, so as to solve the problems existing in the prior art.

[0005] To achieve the above-mentioned object, the present invention provides the following solution: The present invention provides a device for simulating the competitive dissolution characteristics of injected gas in an oil-water mixed environment, comprising:

[0006] A temperature-adjustable test box, wherein a bracket is installed at the bottom of the temperature-adjustable test box;

[0007] An autoclave, the autoclave is fixed on the bracket, the autoclave has an exhaust assembly inside, and a stirring assembly is installed on the top of the autoclave;

[0008] a fluid injection system, the fluid injection system comprising a gas container, a formation water container, and a formation crude oil container, the gas container, the formation water container, and the formation crude oil container being connected to a liquid inlet of the autoclave via a delivery pipeline, and the gas container, the formation water container, and the formation crude oil container being all connected to a pressure assembly;

[0009] A flash evaporation system is provided in the temperature-adjustable test chamber, and a plurality of fluid outlets are vertically opened on the side of the autoclave, and the flash evaporation system is respectively connected to the fluid outlets on the side of the autoclave;

[0010] A data acquisition system, wherein the data acquisition system comprises a data acquisition unit and a terminal system, wherein the data acquisition unit is installed in the autoclave and is signal-connected to the terminal system;

[0011] Wherein, a gas outlet is provided on the top of the autoclave, and a valve is installed on the gas outlet.

[0012] According to the device for simulating the competitive dissolution characteristics of injected gas in an oil-water mixed environment provided by the present invention, the exhaust assembly includes a first piston slidably arranged in the autoclave, a pressure medium is filled between the first piston and the bottom of the autoclave, and the bottom of the autoclave is fixedly connected to a first displacement pump.

[0013] According to the device for simulating the competitive dissolution characteristics of injected gas in an oil-water mixed environment provided by the present invention, the stirring assembly includes a magnetic stirrer fixedly connected to the top cover of the autoclave, and a magnetic stirrer is rotatably connected to the bottom of the top cover of the autoclave, and the magnetic stirrer is transmission-coordinated with the magnetic stirrer.

[0014] According to the device for simulating the competitive dissolution characteristics of injected gas in an oil-water mixed environment provided by the present invention, second pistons are slidably connected in the gas container, the formation water container and the formation crude oil container, respectively. Pressure chambers are formed between the bottom of the gas container and the second piston, between the bottom of the formation water container and the second piston, and between the bottom of the formation crude oil container and the second piston, respectively. The pressure chambers are connected to the pressure assembly.

[0015] According to the device for simulating the competitive dissolution characteristics of injected gas in an oil-water mixed environment provided by the present invention, the pressure component is connected to a second displacement pump, and the bottoms of the gas container, the formation water container and the formation crude oil container are respectively fixedly connected with connecting pipes, and the connecting pipes are connected to the second displacement pump.

[0016] According to the device for simulating the competitive dissolution characteristics of injected gas in an oil-water mixed environment provided by the present invention, the delivery pipeline includes connecting pipes fixedly connected to the tops of the gas container, the formation water container and the formation crude oil container, respectively. The liquid inlet of the autoclave is fixedly connected to a main pipeline, a diverter is installed at one end of the main pipeline, and the connecting pipes are respectively connected to the ports of the diverter.

[0017] According to the device for simulating the competitive dissolution characteristics of injected gas in an oil-water mixed environment provided by the present invention, the data acquisition unit includes a pressure sensor and a temperature sensor, the probe of the pressure sensor and the probe of the temperature sensor are both arranged in the autoclave, and the pressure sensor and the temperature sensor are both connected to the terminal system signal.

[0018] According to the device for simulating competitive dissolution characteristics of injected gas in an oil-water mixed environment provided by the present invention, the flash evaporation system includes a plurality of flash evaporation tubes fixedly connected to the side wall of the autoclave, and a gas meter is installed on the flash evaporation tubes.

[0019] The method for simulating competitive dissolution characteristics of injected gas in an oil-water mixed environment includes the following steps:

[0020] S1, injecting the configured formation water, injection gas, and formation crude oil into the formation water container, gas container, and formation crude oil container respectively, and adjusting the temperature of the adjustable temperature test box so that the temperature of the adjustable temperature test box is the reservoir temperature;

[0021] S2: If the reservoir has not been water flooded, then S3, S5-S7 are implemented; if the reservoir has been water flooded, then S4-S7 are implemented;

[0022] S3 determines the reservoir oil-water volume ratio R based on the bound water saturation and reservoir reserves interpreted by well logging. A formation water container is connected to the autoclave, and a certain amount of formation water is injected into the autoclave. The gas in the autoclave is exhausted using a vent assembly, and pressure is continuously applied until the pressure of the formation water in the autoclave reaches the reservoir pressure. A formation crude oil container is connected to the autoclave, and a certain amount of formation crude oil is transferred into the autoclave at a constant pressure according to the proportional coefficient R. The formation water container and the formation crude oil container are disconnected, and a gas container is connected to the autoclave. A portion of the injection gas is injected into the autoclave at a constant pressure. The connection between the autoclave and the gas container is maintained throughout the experiment.

[0023] S4, based on the bound water saturation, original reserves of the reservoir, and crude oil recovery after waterflooding interpretation, the volume ratio R2 of the remaining oil and water in the reservoir is determined, a certain amount of formation water is injected into the autoclave, the gas in the autoclave is discharged using an exhaust assembly, and the pressure of the formation water in the autoclave is continuously increased to the reservoir pressure. The formation crude oil container is connected to the autoclave, and a certain amount of formation crude oil is transferred to the autoclave at a constant pressure according to the proportional coefficient R2. The formation water container and the formation crude oil container are disconnected, and the gas container is connected to the autoclave. A portion of injection gas is injected into the autoclave at a constant pressure, and the stirring system is turned on to allow the injection gas to fully dissolve in the oil-water mixed environment. As the injection gas dissolves, the pressure in the autoclave will decrease, and the injection gas is replenished to the initial pressure through the gas container.

[0024] When the volume of the S5 gas container does not exceed 0.1 mL within 5 hours, the injected gas dissolves and diffuses in the oil and water in equilibrium, and the positions of the gas, oil, oil, and water interfaces are determined based on the initial injected volumes of oil and water;

[0025] S6: The flash evaporation system extracts water and oil samples from the fluid outlets at the corresponding positions of the autoclave. The pressure must be kept constant during the extraction process to ensure that the fluids do not undergo phase change. The corresponding oil-gas mixed volume and water-gas mixed volume are read, and the solubility of the injected gas in the oil phase and the solubility in the water phase are calculated respectively. The solubility of the gas in the different phases and the degree of mutual influence between them are compared.

[0026] S7, end the experiment, clean the autoclave and proceed to the next experiment.

[0027] The present invention discloses the following technical effects:

[0028] The present invention can simulate the dissolution characteristics of injected gas in crude oil and water during gas injection oil production in original oil reservoirs and oil reservoirs after water injection development, grasp the solubility of injected gas in different phases under the coexistence of oil and water and the composition change law after the injected gas dissolution equilibrium, which plays an important guiding role in determining the gas injection volume and grasping the influence of gas dissolution on the properties of crude oil and water. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 This is a schematic structural diagram of the device for simulating the competitive dissolution characteristics of injected gas in an oil-water mixed environment according to the present invention.

[0031] Among them, 1. Adjustable temperature test chamber; 2. Fluid injection system; 3. First displacement pump; 4. First piston; 5. Bracket; 6. Second displacement pump; 7. Flash tube; 8. Gas meter; 9. Terminal system; 10. Data acquisition unit; 11. Gas outlet; 12. Magnetic stirrer; 13. Magnetic stirrer; 14. Autoclave. DETAILED DESCRIPTION

[0032] 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 ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] Reference Figure 1 The present invention provides a device for simulating competitive dissolution characteristics of injected gas in an oil-water mixed environment, comprising:

[0035] A temperature-adjustable test box 1, wherein a bracket 5 is installed at the bottom of the temperature-adjustable test box 1;

[0036] The autoclave 14 is fixed on the bracket 5, the autoclave 14 has an exhaust assembly inside, and a stirring assembly is installed on the top of the autoclave 14;

[0037] The fluid injection system 2 includes a gas container, a formation water container, and a formation crude oil container. The gas container, the formation water container, and the formation crude oil container are connected to the liquid inlet of the autoclave 14 through a transmission pipeline. The gas container, the formation water container, and the formation crude oil container are all connected to the pressure component;

[0038] The flash evaporation system is arranged in the temperature-adjustable test chamber 1. A plurality of fluid outlets are vertically opened on the side of the autoclave 14. The flash evaporation system is respectively connected to the fluid outlets on the side of the autoclave 14.

[0039] The data acquisition system includes a data acquisition unit 10 and a terminal system 9. The data acquisition unit 10 is installed in the autoclave 14 and is signal-connected to the terminal system 9.

[0040] The terminal system 9 can be configured according to the specific use environment, for example, it can be a single chip microcomputer or controlled by a PLC, ARM (Advanced RISC Machine: high-end reduced instruction set machine), FPGA (Field-Programmable Gate Array: Field Programmable Gate Array) and the like, which is not specifically limited in this embodiment;

[0041] A gas outlet 11 is provided on the top of the autoclave 14 , and a valve is installed on the gas outlet 11 .

[0042] The present invention can simulate the dissolution characteristics of injected gas in crude oil and water during gas injection oil production in original oil reservoirs and oil reservoirs after water injection development, grasp the solubility of injected gas in different phases under the coexistence of oil and water and the composition change law after the injected gas dissolution equilibrium, which plays an important guiding role in determining the gas injection volume and grasping the influence of gas dissolution on the properties of crude oil and water.

[0043] According to a further optimized solution, the exhaust assembly includes a first piston 4 slidably arranged in the autoclave 14 , a pressure medium is filled between the first piston 4 and the bottom of the autoclave 14 , and the bottom of the autoclave 14 is fixedly connected to a first displacement pump 3 .

[0044] The first displacement pump 3 is used to control the pressure medium in the autoclave 14, thereby controlling the first piston 4 to slide in the autoclave 14, thereby controlling the pressure in the space between the first piston 4 and the autoclave cover 14, and this space serves as a reaction space.

[0045] To further optimize the solution, the stirring assembly includes a magnetic stirrer 13 fixedly connected to the top cover of the autoclave 14, and a magnetic stirrer 12 is rotatably connected to the bottom of the top cover of the autoclave 14. The magnetic stirrer 13 is matched with the magnetic stirrer 12 in a transmission manner.

[0046] The magnetic stirrer 13 and the magnetic stirring bar 12 are used in combination to achieve stirring in the autoclave 14 .

[0047] A further optimization scheme involves slidingly connecting a second piston to each of the gas container, formation water container, and formation crude oil container. Pressure chambers are formed between the bottom of the gas container and the second piston, between the bottom of the formation water container and the second piston, and between the bottom of the formation crude oil container and the second piston, respectively, and are connected to the pressure assembly. A second displacement pump 6 controls the pressure between the second piston and the pressure chambers at the bottoms of the gas, formation water, and formation crude oil containers, respectively, thereby feeding the corresponding fluids in the three containers into the autoclave 14. A flow divider is used for control in between. The flow divider allows for control of individual connecting pipes, ensuring controllable connectivity. Once water and oil injection is complete, the corresponding connecting pipes can be disconnected, leaving only the gas container connected to the autoclave 14, thereby controlling the pressure within the autoclave.

[0048] According to a further optimized solution, the pressure assembly is connected to a second displacement pump 6 , and the bottoms of the gas container, the formation water container and the formation crude oil container are respectively fixedly connected with connecting pipes, which are connected to the second displacement pump 6 .

[0049] To further optimize the solution, the delivery pipeline includes connecting pipes fixedly connected to the top of the gas container, the formation water container and the formation crude oil container respectively. The liquid inlet of the autoclave 14 is fixedly connected to a main pipeline, a diverter is installed at one end of the main pipeline, and the connecting pipes are respectively connected to the ports of the diverter.

[0050] To further optimize the solution, the data acquisition unit 10 includes a pressure sensor and a temperature sensor. The probes of the pressure sensor and the temperature sensor are both located within the autoclave 14 and are connected to the terminal system 9. The pressure and temperature sensors are used to monitor the pressure and temperature within the autoclave 14, respectively, to facilitate subsequent experiments.

[0051] According to a further optimized solution, the flash evaporation system includes a plurality of flash evaporation tubes 7 , which are fixedly connected to the side wall of the autoclave 14 , and a gas meter 8 is installed on the flash evaporation tubes 7 .

[0052] The method for simulating competitive dissolution characteristics of injected gas in an oil-water mixed environment includes the following steps:

[0053] S1, injecting the configured formation water, injection gas, and formation crude oil into the formation water container, the gas container, and the formation crude oil container respectively, and adjusting the temperature of the adjustable temperature test box 1 so that the temperature of the adjustable temperature test box 1 is the reservoir temperature;

[0054] S2: If the reservoir has not been water flooded, then S3, S5-S7 are implemented; if the reservoir has been water flooded, then S4-S7 are implemented;

[0055] S3 determines the reservoir oil-water volume ratio R based on the bound water saturation and reservoir reserves interpreted by well logging. The formation water container is connected to the autoclave 14, and a certain amount of formation water is injected into the autoclave 14. The gas in the autoclave 14 is exhausted using an exhaust assembly. The pressure is continuously applied until the pressure of the formation water in the autoclave 14 reaches the reservoir pressure. The formation crude oil container is connected to the autoclave 14, and a certain amount of formation crude oil is transferred into the autoclave 14 at a constant pressure according to the proportional coefficient R. The formation water container and the formation crude oil container are disconnected. The gas container is connected to the autoclave 14, and a portion of the injection gas is injected into the autoclave 14 at a constant pressure. The connection between the autoclave 14 and the gas container is maintained during the experiment.

[0056] S4, based on the bound water saturation, original reserves of the reservoir, and crude oil recovery rate after water flooding interpretation, the volume ratio R2 of the remaining oil and water in the reservoir is determined, a certain amount of formation water is injected into the autoclave 14, the gas in the autoclave 14 is discharged using an exhaust assembly, and the pressure of the formation water in the autoclave 14 is continuously increased to the reservoir pressure. The formation crude oil container is connected to the autoclave 14, and a certain amount of formation crude oil is transferred into the autoclave 14 at a constant pressure according to the proportional coefficient R2. The formation water container and the formation crude oil container are disconnected, and the gas container is connected to the autoclave 14. A portion of injection gas is injected into the autoclave 14 at a constant pressure. The stirring system is turned on to allow the injection gas to fully dissolve in the oil-water mixed environment. As the injection gas dissolves, the pressure in the autoclave 14 will decrease, and the injection gas is replenished to the initial pressure in the autoclave 14 through the gas container;

[0057] When the volume of the S5 gas container does not exceed 0.1 mL within 5 hours, the injected gas dissolves and diffuses in the oil and water in equilibrium, and the positions of the gas, oil, oil, and water interfaces are determined based on the initial injected volumes of oil and water;

[0058] S6, the flash evaporation system extracts the water sample and the oil sample from the fluid outlet at the corresponding position of the autoclave 14. The pressure must be kept constant during the extraction process to ensure that the fluid does not undergo phase change. The corresponding oil-gas mixed volume and water-gas mixed volume are read, and the solubility of the injected gas in the oil phase and the solubility in the water phase are calculated respectively. The solubility of the gas in the different phases and the degree of mutual influence between them are compared;

[0059] S7, the experiment ends, and the autoclave 14 is cleaned for the next experiment. After the experiment is completed, the autoclave 14 is cleaned, and the water-oil injection ratio, injection gas composition, and pressure can be further changed to study the competitive dissolution of the injection gas in the oil and water phases at different development stages.

[0060] In this embodiment, the configuration of the formation crude oil is carried out in accordance with GB / T26981, 2011 "Analysis Methods of Physical Properties of Oil and Gas Reservoir Fluids".

[0061] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0062] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A device for simulating competitive dissolution characteristics of injected gas in an oil-water mixed environment, characterized in that: include: A temperature-adjustable test box (1), wherein a bracket (5) is installed at the bottom of the temperature-adjustable test box (1); A high-pressure autoclave (14), the high-pressure autoclave (14) being fixed on the bracket (5), an exhaust assembly being provided in the high-pressure autoclave (14), and a stirring assembly being installed on the top of the high-pressure autoclave (14); A fluid injection system (2), the fluid injection system (2) comprising a gas container, a formation water container and a formation crude oil container, the gas container, the formation water container and the formation crude oil container being connected to a liquid inlet of the autoclave (14) via a delivery pipeline, and the gas container, the formation water container and the formation crude oil container being all connected to a pressure assembly; A flash evaporation system, wherein the flash evaporation system is arranged in the temperature-adjustable test box (1), a plurality of fluid outlets are vertically opened on the side of the autoclave (14), and the flash evaporation system is respectively connected to the fluid outlets on the side of the autoclave (14); A data acquisition system, the data acquisition system comprising a data acquisition unit (10) and a terminal system (9), the data acquisition unit (10) being installed in the autoclave (14), and the data acquisition unit (10) being signal-connected to the terminal system (9); The top of the autoclave (14) is provided with an air outlet (11), and a valve is installed on the air outlet (11); The method for simulating competitive dissolution characteristics of injected gas in an oil-water mixed environment includes the following steps: S1, injecting the configured formation water, injection gas, and formation crude oil into the formation water container, the gas container, and the formation crude oil container respectively, and adjusting the temperature of the temperature-adjustable test box (1) so that the temperature of the temperature-adjustable test box (1) is the reservoir temperature; S2: If the reservoir has not been water flooded, then S3, S5-S7 are implemented; if the reservoir has been water flooded, then S4-S7 are implemented; S3 determines the volume ratio coefficient R of oil and water in the reservoir based on the bound water saturation and reservoir reserves interpreted by well logging, connects the formation water container with the autoclave (14), injects a certain amount of formation water into the autoclave (14), uses an exhaust assembly to discharge the injected gas in the autoclave (14), continuously applies pressure, and then pressurizes the formation water pressure in the autoclave (14) to the reservoir pressure, connects the formation crude oil container with the autoclave (14), and transfers formation crude oil into the autoclave (14) at a constant pressure according to the volume ratio coefficient R of oil and water in the reservoir, cuts off the formation water container and the formation crude oil container, connects the gas container with the autoclave (14), and injects a portion of the injected gas into the autoclave (14) at a constant pressure, and maintains the autoclave (14) and the gas container connected during the experiment; S4, based on the bound water saturation, the original reserves of the reservoir, and the crude oil recovery rate after water injection development interpreted by well logging, the volume ratio coefficient R2 of the remaining oil and water in the reservoir is determined, a certain amount of formation water is injected into the autoclave (14), the injected gas in the autoclave (14) is discharged by using an exhaust assembly, and the pressure is continuously applied, and then the pressure of the formation water in the autoclave (14) is increased to the reservoir pressure, the formation crude oil container is connected to the autoclave (14), and the formation crude oil is transferred into the autoclave (14) at a constant pressure according to the volume ratio coefficient R2 of oil and water, the formation water container and the formation crude oil container are cut off, the gas container is connected to the autoclave (14), and part of the injected gas is injected into the autoclave (14) at a constant pressure, the stirring system is turned on, and the injected gas is fully dissolved in the oil-water mixed environment. As the injected gas dissolves, the pressure in the autoclave (14) decreases, and the injected gas is replenished into the autoclave (14) through the gas container to the initial pressure; When the volume of the S5 gas container does not exceed 0.1 mL within 5 hours, the injected gas dissolves and diffuses in the oil and water in equilibrium, and the positions of the gas, oil, oil, and water interfaces are determined based on the initial injected volumes of oil and water; S6, the flash evaporation system extracts the water sample and the oil sample from the fluid outlet at the corresponding position of the autoclave (14). The pressure needs to be kept constant during the extraction process to ensure that the fluid does not undergo phase change. The corresponding oil-gas mixed volume and water-gas mixed volume are read, and the solubility of the injected gas in the oil phase and the solubility in the water phase are calculated respectively. The solubility of the gas in different phases and the degree of mutual influence between them are compared; S7, end the experiment, clean the autoclave (14) and proceed to the next experiment.

2. The device for simulating competitive dissolution characteristics of injected gas in an oil-water mixed environment according to claim 1, characterized in that: The exhaust assembly comprises a first piston (4) slidably arranged in the autoclave (14), a pressure medium is filled between the first piston (4) and the bottom of the autoclave (14), and the bottom of the autoclave (14) is fixedly connected to a first displacement pump (3).

3. The device for simulating competitive dissolution characteristics of injected gas in an oil-water mixed environment according to claim 1, characterized in that: The stirring assembly includes a magnetic stirrer (13) fixedly connected to the top cover of the autoclave (14), and a magnetic stirrer (12) is rotatably connected to the bottom of the top cover of the autoclave (14), and the magnetic stirrer (13) is in transmission cooperation with the magnetic stirrer (12).

4. The device for simulating competitive dissolution characteristics of injected gas in an oil-water mixed environment according to claim 1, characterized in that: A second piston is slidably connected to the gas container, the formation water container and the formation crude oil container, respectively. A pressure chamber is formed between the bottom of the gas container and the second piston, between the bottom of the formation water container and the second piston, and between the bottom of the formation crude oil container and the second piston, respectively. The pressure chamber is connected to the pressure assembly.

5. The device for simulating competitive dissolution characteristics of injected gas in an oil-water mixed environment according to claim 4, characterized in that: The pressure assembly is connected to a second displacement pump (6), and the bottoms of the gas container, the formation water container, and the formation crude oil container are respectively fixedly connected with a connecting pipe, and the connecting pipe is connected to the second displacement pump (6).

6. The device for simulating competitive dissolution characteristics of injected gas in an oil-water mixed environment according to claim 1, characterized in that: The delivery pipeline includes connecting pipes fixedly connected to the top of the gas container, the formation water container and the formation crude oil container respectively. The liquid inlet of the autoclave (14) is fixedly connected to a main pipeline. A diverter is installed at one end of the main pipeline. The connecting pipes are respectively connected to the ports of the diverter.

7. The device for simulating competitive dissolution characteristics of injected gas in an oil-water mixed environment according to claim 1, characterized in that: The data acquisition unit (10) includes a pressure sensor and a temperature sensor. The probe of the pressure sensor and the probe of the temperature sensor are both arranged in the autoclave (14). The pressure sensor and the temperature sensor are both connected to the terminal system (9) for signal transmission.

8. The device for simulating competitive dissolution characteristics of injected gas in an oil-water mixed environment according to claim 1, characterized in that: The flash evaporation system comprises a plurality of flash evaporation tubes (7), wherein the flash evaporation tubes (7) are fixedly connected to the side wall of the autoclave (14), and a gas meter (8) is installed on the flash evaporation tubes (7).

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