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

Abstract

The invention discloses a device and method for simulating competitive dissolution characteristics of injection gas in an oil-water mixed environment, and the device comprises a temperature-adjustable test box, the bottom of which is provided with a support; the high-pressure kettle is fixed on the bracket, an exhaust assembly is arranged in the high-pressure kettle, and a stirring assembly is mounted at the top of the high-pressure kettle; the fluid injection system comprises a gas container, a formation water container and a formation crude oil container, and the gas container, the formation water container and the formation crude oil container all communicate with the pressure assembly; the flash evaporation system is arranged in the temperature-adjustable test box, a plurality of fluid outlets are vertically formed in the side face of the high-pressure kettle, and the flash evaporation system is communicated with the fluid outlets in the side face of the high-pressure kettle; the data collector system comprises a data collection unit and a terminal system; an air outlet is formed in the top of the high-pressure kettle and is provided with a valve. The device can simulate the dissolution characteristics of the injected gas in the oil and water mixed environment in different stages of the oil reservoir development process, and can effectively guide the field actual production.

Description

Technical Field

[0001] The 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 most used energy, oil is the "blood" of modern industry. Oil resources have been widely used in all walks of life and have long been deeply rooted in people's daily lives. It is also an indispensable strategic resource for the survival and development of the country, and plays a vital role in ensuring the country's economic and social development and even national defense security. However, oil is a non-renewable energy source with limited reserves, so it is particularly important to maximize the recovery of oil resources stored in the strata. At present, low-permeability oil reservoirs account for a high proportion of my country's proven oil reserves, but the reservoir permeability of low-permeability oil reservoirs is low and difficult to effectively exploit. Therefore, the technology to improve the recovery rate of low-permeability and ultra-low-permeability oil reservoirs has received widespread attention.

[0003] At present, mature technologies for developing low permeability reservoirs include water injection, gas injection, fracturing and other technologies. Among them, gas injection oil recovery is considered to be the most effective way to improve the recovery rate of low permeability and ultra-low permeability reservoirs. After the gas is injected into the reservoir, it will partially dissolve into the crude oil to improve the fluidity of the crude oil, promote the expansion of the crude oil volume, and drive the crude oil to improve the recovery rate of crude oil. Among them, CO2 has the strongest solubility in crude oil and has the best oil recovery effect. The use of CO2 flooding can also achieve the storage of greenhouse gas CO2. In addition to crude oil, the reservoir also contains bound water. The solubility of CO2 in different phases is different. The coexistence of oil and water will affect the dissolution of gas. Especially for further gas drive of oil reservoirs after water drive, the initial water content is high, and the competitive solubility of CO2 in oil and water phases will be more different. The prior art 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 injection development, 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. 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 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 the liquid inlet of the autoclave through a delivery pipeline, and the gas container, the formation water container and the formation crude oil container being connected to a pressure assembly;

[0009] A flash evaporation system, wherein the flash evaporation system is arranged in the temperature-adjustable test box, 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 at the top of the autoclave, and a valve is installed on the gas outlet.

[0012] According to the device for simulating competitive dissolution characteristics of injected gas in an oil-water mixed environment provided by the present invention, the exhaust component 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 the bottom of the top cover of the autoclave is rotatably connected to a magnetic stirrer, 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, and 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 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 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, the flash evaporation tubes are fixedly connected to the side walls 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, the gas container, and the 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 simulating an oil reservoir that has not been flooded with water, then implement S3, S5-S7; if simulating an oil reservoir that has been flooded with water, then implement S4-S7;

[0022] S3: According to the bound water saturation and reservoir reserves interpreted by well logging, the oil-water volume ratio R of the reservoir is determined, the formation water container is connected with the autoclave, a certain amount of formation water is injected into the autoclave, the gas in the autoclave is discharged by using the exhaust assembly, the pressure of the formation water in the autoclave is continuously applied, and then the pressure of the formation water in the autoclave is increased to the reservoir pressure, the formation crude oil container is connected with the autoclave, 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 cut off, the gas container is connected with the autoclave, and part of the injection gas is injected into the autoclave at a constant pressure, and the autoclave and the gas container are kept connected during the experiment;

[0023] S4, according to the bound water saturation, the original reserves of the reservoir, and the crude oil recovery rate after water injection development interpreted by well logging, determine the volume ratio R2 of the remaining oil and water in the reservoir, inject a certain amount of formation water into the autoclave, use the exhaust component to exhaust the gas in the autoclave, continue to apply pressure, and then pressurize the formation water pressure in the autoclave to the reservoir pressure, connect the formation crude oil container with the autoclave, and transfer a certain amount of formation crude oil into the autoclave at a constant pressure according to the proportional coefficient R2, cut off the formation water container and the formation crude oil container, connect the gas container with the autoclave, inject part of the injection gas into the autoclave at a constant pressure, start the stirring system, and 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 into the autoclave through the gas container to the initial pressure;

[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 oil and water volumes;

[0025] S6, the flash evaporation system extracts water samples and oil samples from the fluid outlets at the corresponding positions of the autoclave. 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 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 dissolution amount 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 amount 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 drawings required for use in the embodiments will be briefly introduced below. 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 creative work.

[0030] Figure 1 This is a schematic structural diagram of a device for simulating 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 be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work 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 delivery pipeline, and the gas container, the formation water container and the formation crude oil container are all connected to the pressure component;

[0038] Flash evaporation system: the flash evaporation system is arranged in the temperature-adjustable test box 1, and 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;

[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. The data acquisition unit 10 is connected to the terminal system 9 by signals.

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

[0041] A gas outlet 11 is provided at 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 dissolution amount 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 amount 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 disposed 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 of the autoclave 14, and this space is used as a reaction space.

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

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

[0047] Further optimization scheme, the gas container, the formation water container and the formation crude oil container are respectively connected with a second piston in sliding connection, and pressure chambers are respectively 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, and the pressure chambers are connected with the pressure assembly. The pressure between the second piston and the pressure chambers at the bottom of the gas container, the formation water container and the formation crude oil container is respectively controlled by the second displacement pump 6, so that the corresponding fluids in the three containers are input into the autoclave 14, and a diverter is used in the middle for control. The setting of the diverter can control a single connecting pipe, so that the connection of a single connecting pipe can be controlled. When the water and oil injection is completed, the corresponding connecting pipe can be cut off so that only the gas container is connected to the autoclave 14, thereby controlling the pressure in 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 tops 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] Further optimizing the scheme, 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, and the pressure sensor and the temperature sensor are both connected to the terminal system 9 by signal. The pressure and temperature in the autoclave 14 are monitored by the pressure sensor and the temperature sensor respectively, which is convenient for 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 simulating an oil reservoir that has not been flooded with water, then implement S3, S5-S7; if simulating an oil reservoir that has been flooded with water, then implement S4-S7;

[0055] S3 determines the oil-water volume ratio R of the reservoir according to the bound water saturation and reservoir reserves interpreted by logging, connects the formation water container with the autoclave 14, injects a certain amount of formation water into the autoclave 14, uses the exhaust assembly to discharge the gas in the autoclave 14, continuously applies pressure, and then presses the formation water pressure in the autoclave 14 to the reservoir pressure, connects the formation crude oil container with the autoclave 14, transfers a certain amount of formation crude oil into the autoclave 14 at a constant pressure according to the proportional coefficient R, cuts off the formation water container and the formation crude oil container, connects the gas container with the autoclave 14, injects part of the injection gas into the autoclave 14 at a constant pressure, and keeps the autoclave 14 and the gas container connected during the experiment;

[0056] S4, according to 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 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 by using the exhaust component, the pressure of the formation water in the autoclave 14 is continuously applied, and then the pressure of the formation water in the autoclave 14 is compressed to the reservoir pressure, the formation crude oil container is connected to the autoclave 14, 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 cut off, the gas container is connected to the autoclave 14, part of the injection gas is injected into the autoclave 14 at a constant pressure, the stirring system is turned on, and the injection gas is fully dissolved 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 into the autoclave 14 through the gas container to the initial pressure;

[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 oil and water volumes;

[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, and the pressure needs to be kept constant during the extraction process to ensure that the fluid does not undergo phase change, read the corresponding oil-gas mixed volume and water-gas mixed volume, calculate the solubility of the injected gas in the oil phase and the solubility in the water phase, and compare the solubility of the gas in different phases and the degree of influence between them;

[0059] S7, the experiment is ended, and the autoclave 14 is cleaned for the next experiment. After the experiment is finished, the autoclave 14 is cleaned, and the water-oil injection ratio, injection gas composition, pressure, etc. can be further changed to study the competitive dissolution law 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 for Physical Properties of Oil and Gas Reservoir Fluids".

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

[0062] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A device for simulating the 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), wherein the high pressure autoclave (14) is fixed on the support (5), an exhaust assembly is provided in the high pressure autoclave (14), and a stirring assembly is 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 the 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 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), the data acquisition unit (10) being signal-connected to the terminal system (9); The top of the autoclave (14) is provided with a gas outlet (11), and a valve is installed on the gas outlet (11).

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 comprises a magnetic stirrer (13) fixedly connected to the top cover of the autoclave (14); the bottom of the top cover of the autoclave (14) is rotatably connected to a magnetic stirrer (12); 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: The gas container, the formation water container and the formation crude oil container are respectively slidably connected with a second piston, and pressure chambers are respectively 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, and the pressure chambers are 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 connecting pipes, and the connecting pipes are 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 comprises connecting pipes which are respectively fixedly connected to the top of the gas container, the formation water container and the formation crude oil container. 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.

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) comprises 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), and the pressure sensor and the temperature sensor are both connected to the terminal system (9) by signal.

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).

9. A method for simulating the competitive dissolution characteristics of injected gas in an oil-water mixed environment, based on the device for simulating the competitive dissolution characteristics of injected gas in an oil-water mixed environment according to any one of claims 1 to 8, characterized in that: The following steps are involved: 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 simulating an oil reservoir that has not been flooded with water, then implement S3, S5-S7; if simulating an oil reservoir that has been flooded with water, then implement S4-S7; S3: According to the bound water saturation and reservoir reserves interpreted by well logging, the oil-water volume ratio R of the reservoir is determined, the formation water container is connected to the autoclave (14), a certain amount of formation water is injected into the autoclave (14), the gas in the autoclave (14) is discharged by using an exhaust assembly, the pressure of the formation water in the autoclave (14) 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), 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 cut off, the gas container is connected to the autoclave (14), and a part of the injection gas is injected into the autoclave (14) at a constant pressure, and the autoclave (14) and the gas container are kept connected during the experiment; S4, according to 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 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 by using an exhaust component, and the pressure of the formation water in the autoclave (14) 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 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 cut off, the gas container is connected to the autoclave (14), and part of the injection gas is injected into the autoclave (14) 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 (14) will decrease, and the injection 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 oil and water volumes; S6, the flash evaporation system extracts the water sample and the oil sample from the fluid outlets at the corresponding positions 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, the solubility of the injected gas in the oil phase and the solubility in the water phase are calculated, and the solubility of the gas in different phases and the degree of influence between them are compared; S7, end the experiment, clean the autoclave (14) and carry out the next experiment.

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