PVTxy relationship experimental system for measuring thick oil multi-component mixed system

Abstract

The present application provides a kind of for measuring thick oil multivariate mixed system PVTxy relationship experimental system, including multiple balance still, multiple gas storage tank, thick oil tank, sample collector and gas chromatograph, multiple gas storage tank is connected to multiple balance still respectively, different kinds of gas is stored respectively, the thick oil tank is equipped with thick oil, different kinds of gas and thick oil are mixed evenly in multiple balance still and reach equilibrium, can simulate different pressure, temperature, volume and component oil-gas mixture, after the oil-gas mixture in the balance still reaches equilibrium, the sample collector is collected oil-gas mixture, the gas chromatograph is tested to the component distribution of oil-gas mixture collected by the sample collector.The experimental system for measuring thick oil multivariate mixed system PVTxy relationship can significantly improve the efficiency of oil-gas mixing, shorten the overall time to reach mixed equilibrium, realize the purpose of measuring the component distribution of multivariate oil-gas mixture after equilibrium.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of multi-component thermal fluid heavy oil recovery, in particular to a system for measuring PVTxy relationship experiment of heavy oil multi-component mixed system. BACKGROUND

[0002] The world is rich in heavy oil resources and widely distributed, and the development of heavy oil resources helps to promote the utilization of oil resources and economic development. However, due to the high viscosity, large density, thin oil layer thickness and large flow resistance of heavy oil, the use of conventional technology for light oil recovery for heavy oil reservoir recovery is not ideal, and how to more economically and effectively recover heavy oil has become a common problem faced by the world oil industry.

[0003] Multi-component thermal fluid recovery technology is a new technology for recovering heavy oil in recent years, which can expand the volume of heavy oil, reduce the viscosity and interfacial tension of heavy oil and produce a dissolved gas drive effect, thereby increasing the recovery efficiency of heavy oil and becoming one of the most potential oil recovery technologies. In the process of using multi-component thermal fluid recovery technology to recover heavy oil, the phase equilibrium state of multi-phase mixed gas has a great influence on the recovery efficiency of heavy oil, and the study of the phase equilibrium state of multi-phase mixed gas is of great significance for optimizing injection and production parameters and improving heavy oil recovery efficiency.

[0004] Most of the existing phase equilibrium test experimental systems are for single gas or binary mixed gas, and there is insufficient research on ternary and above mixed fluids. Chinese patent CN201510542284.1 proposes a fluid phase state analysis device and its analysis method, which includes at least one set of analysis unit, the analysis unit includes: a first container, a second container and a sample transfer device, the sample transfer device realizes the accurate transfer of the test sample through the volume change of its internal space, and measures the change of the corresponding parameters of the sample. The device can directly observe the single-phase and two-phase state of crude oil macroscopically, and can perform P-V relationship analysis and flash test under different phase conditions microscopically, and through the measurement of multiple fine volume changes, the bubble point pressure, gas-oil ratio, formation volume factor and other formation parameters of the formation oil are accurately obtained. For the problem of high-cost phase state research of hydrocarbon analysis pure samples, the device and its analysis method solve the problem of micro-sample basic phase state parameter test, and save the oil and gas field sampling operation cost. The device obtains the physical property parameters of the oil by measuring multiple fine volume changes, which can be used to analyze the dynamic change of the gas drive front position during gas drive, and solves the problem of micro-sample phase state test.

[0005] CN201810060357.7 discloses a portable fluid PVT property measuring device and method. The device comprises a high-temperature and high-pressure visual sample chamber, a fixing support, and a rotating unit. The high-temperature and high-pressure visual sample chamber comprises a sapphire tube, a first plug and a second plug arranged on both sides of the sapphire tube, a sampling port arranged on the first plug, a sample inlet, a pressure measuring port and an adjusting port arranged on the second plug, and a volume adjusting unit arranged in the sapphire tube through the adjusting port. The volume adjusting unit is connected with the sapphire tube. A pressure monitoring unit is arranged on the volume adjusting unit, one end of the pressure monitoring unit is connected with the pressure measuring port, and the other end is connected with a monitoring terminal. The device has the advantages of integrated structure, small sample amount, small equipment volume, portability, and convenience in laboratory experiments and on-site experiments. The measuring device has the advantages of small volume and light weight, and can be used to measure the PVT properties of fluid on site.

[0006] CN201922047289.3 discloses an injection gas expansion experiment device. The device comprises a PVT cylinder, a piston arranged on one side of the PVT cylinder, a high-pressure resistant transparent plate arranged on the other side of the PVT cylinder, a stepping motor for driving the piston, an oil injection pipe arranged at the bottom of the PVT cylinder, a gas injection pipe, a pressure gauge and a plurality of sampling branch pipes arranged at the top of the PVT cylinder, and a sampling steel cylinder. One end of each sampling branch pipe extends into the PVT cylinder, and the distance from the other end of each sampling branch pipe to the bottom of the PVT cylinder decreases in sequence. A scale is arranged on the high-pressure resistant transparent plate, and the distance from each sampling branch pipe to the bottom of the PVT cylinder is marked on the sampling branch pipe. The scale arranged on the high-pressure resistant transparent plate can be used to directly read the expansion of crude oil before and after gas injection. The plurality of sampling branch pipes arranged at different distances from the bottom of the PVT cylinder can be used to sample and analyze any layer of crude oil in the PVT cylinder. The fixed sampling branch pipes have better sealing performance than the movable sampling pipes. The device can directly read the expansion of petroleum before and after gas injection, and is more convenient to use than other devices. In addition, the existing mixed system phase equilibrium test experiment system has the problems of long oil and gas equilibrium time, single application condition range, and no component distribution measurement of the sample, which restricts the research on the phase equilibrium state of the multi-phase mixed gas and limits the production effect of the multi-component thermal fluid production technology.

[0007] The above prior arts are quite different from the present application, and cannot solve the technical problems we want to solve. Therefore, we have invented a new experimental system for measuring the PVTxy relationship of a multi-component mixed system of heavy oil. SUMMARY

[0008] The present application aims to provide a PVTxy relationship experimental system for measuring a heavy oil multi-component mixed system, which solves the problems of long time required for oil and gas balance measurement, single application working condition range and no component distribution measurement of samples in the prior art.

[0009] The present application can be achieved by the following technical solutions: a PVTxy relationship experimental system for measuring a heavy oil multi-component mixed system, comprising a plurality of balance kettles, a plurality of gas storage tanks, a heavy oil tank, a sample collector and a gas chromatograph, wherein the plurality of gas storage tanks are respectively connected to the plurality of balance kettles and respectively store different kinds of gas, the heavy oil tank is respectively connected to the plurality of balance kettles and contains heavy oil, different kinds of gas and heavy oil are mixed uniformly in the plurality of balance kettles to reach balance, an oil and gas mixture with different pressures, temperatures, volumes and components can be simulated, the sample collector is respectively connected to the plurality of balance kettles, and the oil and gas mixture in the balance kettle is collected after reaching balance, and the gas chromatograph is connected to the sample collector to test the component distribution of the oil and gas mixture collected by the sample collector.

[0010] The present application can also be achieved by the following technical solutions:

[0011] The PVTxy relationship experimental system for measuring a heavy oil multi-component mixed system further comprises a plurality of high-precision pumps, which are respectively connected to the plurality of gas storage tanks and the heavy oil tank to control the proportion of different kinds of gas and heavy oil entering the plurality of balance kettles.

[0012] The PVTxy relationship experimental system for measuring a heavy oil multi-component mixed system further comprises a plurality of pressure measuring devices, which are located between the plurality of balance kettles and the plurality of gas storage tanks to detect the pressure of the plurality of gas storage tanks.

[0013] The PVTxy relationship experimental system for measuring a heavy oil multi-component mixed system further comprises a plurality of density meters, which are respectively connected to the plurality of balance kettles to measure the density of the oil and gas mixture.

[0014] The PVTxy relationship experimental system for measuring a heavy oil multi-component mixed system further comprises a sample collector, which is respectively connected to the plurality of balance kettles to collect the oil and gas mixture.

[0015] The number of the plurality of gas storage tanks is three, which respectively store N2, CO2 and water vapor.

[0016] The PVTxy relationship experimental system for measuring a heavy oil multi-component mixed system further comprises a PVT instrument, which is respectively connected to the plurality of balance kettles to monitor the pressure, temperature and volume of the oil and gas mixture to determine whether the oil and gas mixture reaches balance.

[0017] The balance kettle comprises a balance kettle end cover, a PVT cylinder, an energized coil and a plurality of free rolling balls, the PVT cylinder is externally wound with the energized coil, the energized coil is energized to generate a magnetic field to promote the plurality of free rolling balls to move irregularly in the PVT cylinder, the up-and-down irregular movement of the plurality of free rolling balls is realized by changing the current direction, the components in the PVT cylinder are stirred, and the uniform distribution of the components is promoted.

[0018] The balance kettle further comprises a bottom groove, the plurality of free rolling balls are stalled in the bottom groove without the action of an external magnetic field, and the bottom groove is internally provided with a plurality of grooves matched in size with the plurality of free rolling balls.

[0019] The balance kettle further comprises a heating jacket, which is located outside the PVT cylinder, is connected to the PVT instrument, and is controlled by the PVT instrument to realize the setting and monitoring of the temperature of the oil-gas mixing process in the balance kettle.

[0020] The balance kettle end cover comprises an end cover body, an air injector, a sampling pipe and an oil injector, the air injector is connected to the plurality of gas storage tanks respectively, the oil injector is connected to the heavy oil tank, the sampling pipe is connected to the sample collector, the outlet of the air injector is located below the outlet of the oil injector, and the oil injector and the air injector work simultaneously to shorten the time for the oil-gas mixture to reach equilibrium.

[0021] The present application is based on the advantages of the existing heavy oil-gas mixing system measurement experiment system, and an improved experimental system for measuring the PVTxy (P-pressure, V-specific volume, T-temperature, x-the proportion of each component in the liquid phase after phase equilibrium, and y-the proportion of each component in the gas phase after phase equilibrium) relationship of a heavy oil multi-component mixing system is invented, which is composed of three balance kettles, three gas storage tanks, a heavy oil tank, a gas chromatograph, a PVT instrument, a densimeter and a plurality of sample collectors, valves and high-precision metering pumps. The test system accelerates the balance of the oil-gas mixture through the cooperation of the energized coil and the free rolling balls. The design of the three balance kettles can realize the output of the phase equilibrium data of the oil-gas mixture under multiple working conditions. The design of the gas chromatograph can measure the component distribution of the oil-gas mixture, and finally obtain the relationship formula of pressure, temperature, volume and components. In summary, the present application can efficiently and accurately obtain the phase equilibrium relationship of the oil-gas mixture. Compared with the prior art, the beneficial effects are:

[0022] (1) By increasing the energized coil outside the PVT cylinder and cooperating with the free rolling balls in the balance kettle, the efficiency of oil-gas mixing can be significantly improved.

[0023] (2) By designing the internal structure of the balance kettle end cover, adding an oil injector and an air injector, the gas and heavy oil can achieve good mixing effect at the initial stage of entering the balance kettle, and the time for the whole mixture to reach equilibrium is shortened.

[0024] (3) By increasing the gas chromatograph in the experimental system can achieve the purpose of measuring the composition distribution of the multi-component oil and gas mixture after equilibrium. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a structural diagram of a specific embodiment of the experimental system for measuring PVTxy relationship of a heavy oil multi-component mixture of the present application;

[0026] Figure 2 is a schematic diagram of a bottom groove adapted to the free rolling ball in the balance kettle in which three free rolling balls can be placed in a specific embodiment of the present application;

[0027] Figure 3 is a schematic diagram of the internal structure of the top end cover adapted to the balance kettle in a specific embodiment of the present application;

[0028] In the figure: 1-valve, 2-high precision metering pump, 3-PVT instrument, 4-heavy oil tank, 5-sample collector, 6-gas chromatograph, 7-density meter, 8-sample collector, 9-balance kettle end cover, 10-electric coil, 11-free rolling ball, 12-bottom groove, 13-heating jacket, 14-pressure measurer, 15-gas storage tank, 16-end cover body, 17-air ejector, 18-sampling tube, 19-oil sprayer. DETAILED DESCRIPTION

[0029] It should be noted that the following detailed description is exemplary in nature and is intended to provide further description of the present application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0030] It is to be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments consistent with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0031] The experimental system for measuring PVTxy relationship of a heavy oil multi-component mixture of the present application is composed of three balance kettles, three gas storage tanks, a heavy oil tank, a gas chromatograph, a PVT instrument, a density meter, and a plurality of sample collectors, valves and high-precision metering pumps. The balance kettle is composed of a balance kettle end cover, an electric coil, a free rolling ball, a bottom groove, a PVT cylinder and a heating jacket. The balance kettle end cover is composed of an end cover body, an air ejector, a sampling tube and an oil sprayer.

[0032] The experimental test system includes, but is not limited to three balanced kettle structure, can realize multiple working condition under oil and gas mixture pressure, temperature, volume and component multiple data output at the same time, improve the experimental efficiency.

[0033] The free rolling ball is arranged in the balanced kettle, the PVT cylinder is wound with a power coil, and the power coil controls the up-down movement of the free rolling ball, and promotes the balance of the oil and gas mixture.

[0034] The PVT instrument monitors the pressure, temperature and volume of the oil and gas mixture, and is used to judge whether the oil and gas mixture reaches balance.

[0035] The gas chromatograph is used to measure the component distribution of the oil and gas mixture after balance, and is used to obtain the relationship between temperature, pressure, volume and component.

[0036] The gas tank can include, but is not limited to, N2, CO2 and water vapor.

[0037] The following are several specific embodiments of the application

[0038] Example 1

[0039] In application of a specific embodiment 1 of the present application, an experimental system for measuring PVTxy relationship of a heavy oil multi-component mixture system of the present application mainly comprises three equilibrium stills, three gas storage tanks, a heavy oil tank, a gas chromatograph, a PVT instrument, a densimeter and a plurality of sample collectors, valves and high-precision metering pumps. The three equilibrium stills are structurally identical and each comprises an end cover, a PVT cylinder, a magnetic coil, three freely rolling balls, a heating jacket and a bottom groove. The gas storage tanks and the heavy oil tank are connected to the high-precision metering pumps, which control the proportions of the components introduced into the equilibrium stills, and the valves control the opening and closing of the gas path and the oil path. The oil-gas mixing process is carried out in the equilibrium stills, and the order of the components introduced into the three equilibrium stills is controlled by the opening and closing of the valves. The mixing process in the equilibrium stills is carried out by simultaneously opening the valves controlling the gas path and the oil path, so that the gas and the heavy oil are introduced into the equilibrium stills at the same time, and the frequencies of the two pumps are controlled to make the flow times of the two components in the pipelines approximately equal. A sample collection tube, an oil injector and a gas injector are arranged in the end cover of the equilibrium still. The outlet of the gas injector is located below the outlet of the oil injector, and the simultaneous operation of the two injectors can shorten the time for the oil-gas mixture to reach equilibrium. The PVT cylinder of the equilibrium still is controlled by the PVT instrument, which is used to set and monitor the temperature of the oil-gas mixing process in the equilibrium still. The PVT cylinder is externally wound with an energized coil, and the magnetic field generated by the energized coil causes the freely rolling balls to move randomly. By changing the direction of the current, the freely rolling balls in the cylinder move up and down randomly, stir the components in the cylinder, promote the uniform distribution of the components, and shorten the time required for equilibrium. The three freely rolling balls are located in each equilibrium still and are stationary in the bottom groove of the equilibrium still under the action of no external magnetic field. The bottom groove is provided with three recesses matched with the sizes of the freely rolling balls. The PVT instrument is connected to the equilibrium stills and can simultaneously set and monitor the pressure, temperature and volume parameters in the three equilibrium stills. When the parameters in the equilibrium stills no longer fluctuate with time, it is considered that the multi-component fluid in the cylinder has reached equilibrium. The sample collector for component measurement collects the oil-gas mixture that has reached equilibrium, and the component distribution in the collector is tested by the gas chromatograph.

[0040] Embodiment 2

[0041] In application of a specific embodiment 2 of the present application, the experimental system for measuring PVTxy relationship of a heavy oil multi-component mixture system proposed by the present application mainly designs the idea of realizing efficient and accurate measurement of oil-gas mixture phase equilibrium. As shown in Figure 1As shown, the experimental system mainly consists of three equilibrium kettles, three gas tanks, a heavy oil tank, a gas chromatograph, a PVT instrument, a densimeter and several sample collection devices. The equilibrium kettle is composed of an equilibrium kettle end cover 9, an energized coil 10, a freely rolling ball 11, a bottom groove 12 and a heating jacket 13. The energized coil 10 is wound outside the equilibrium kettle, and the energized coil 10 generates a magnetic field to promote the irregular movement of the freely rolling ball 11. The energized coil 10 realizes the up-and-down movement of the freely rolling ball 11 by changing the current direction, aiming to shorten the time required for the oil-gas mixture in the equilibrium kettle to reach equilibrium.

[0042] As shown in Figure 2 The bottom groove 12 is provided with three recesses matching the size of the freely rolling ball. When the energized coil 10 is not energized, the freely rolling ball 11 is not affected by the external magnetic field and is located in the recess in the bottom groove 12.

[0043] The sample collector 5 is used to collect the uniformly mixed substances in the equilibrium kettle and is connected with the gas chromatograph to measure the internal component relationship. The sample collector 8 is a simple substance collection device, and the collected substances can be stored or used for other purposes.

[0044] As shown in Figure 3 The equilibrium kettle end cover 9 is composed of an end cover body 16, an air injector 17, a sampling tube 18 and an oil sprayer 19. The outlet of the air injector 17 is located at the lower end of the outlet of the oil sprayer 19, which is designed to make the oil-gas mixture have a certain mixing at the initial stage of entering the equilibrium kettle, thereby shortening the time required for the oil-gas to reach equilibrium. The outlet of the sampling tube 18 is connected with the inlet of the sample collector 5, the densimeter 7 and the sample collector 8 through valves, respectively. The outlet of the sample collector 5 is connected with the inlet of the gas chromatograph 6, realizing the measurement of the component distribution and density of the oil-gas after reaching equilibrium. The outlet of the gas tank 15 is connected with the inlet of the air injector 17 through a valve and a pressure measurer 14, which is arranged between the valve and the air injector 17 and is used to detect the pressure of each gas tank to ensure the safety of the experimental device. The inlet of the gas tank 15 is connected with the outlet of the valve 1, and the inlet of the valve 1 is connected with the outlet of the high-precision metering pump 2. The valve 1 and the high-precision metering pump 2 control the proportion and flow of the gas entering the air injector 17. The outlet of the heavy oil tank 4 is connected with the inlet of the oil sprayer 19, and the inlet of the heavy oil tank 4 is connected with a valve and a high-precision metering pump in sequence. The valve and the high-precision metering pump control the flow of the heavy oil entering the heavy oil tank 4. The outlet of the PVT instrument 3 is connected with a high-precision metering pump and a valve in sequence, and the outlet of the valve is connected with the equilibrium kettle. The PVT instrument 3 controls the operation of the heating jacket 13, realizing the setting and monitoring of the temperature of the oil-gas mixing process in the equilibrium kettle. The densimeter 7 is used to measure the density of the mixed substances, as a basic physical property data of the substances.

[0045] Example 3

[0046] In a specific embodiment 3 of the application, the experimental system tests the work flow of oil and gas phase equilibrium: the valve and high-precision metering pump control the flow of thick oil tank 4 and gas tank 15 into the balance kettle. When the thick oil and gas enter the balance kettle, the energized coil 10 is energized, the free rolling ball 11 starts to move up and down irregularly, accelerates the oil and gas mixture balance, the PVT instrument 3 monitors the pressure, temperature and volume of the oil and gas mixture in the balance kettle, when the values of pressure, temperature and volume monitored by the PVT instrument do not fluctuate with time, the oil and gas mixture in the balance kettle reaches equilibrium. The energized coil 10 stops energizing, the free rolling ball 11 stops moving up and down irregularly, and falls into the groove of the bottom groove 12. The sampling tube 18 takes the sample of the balanced oil and gas mixture, and transports it to the sample collector 5 and the densimeter 7 through the valve. The sample collector 5 transports the oil and gas mixture sample to the gas chromatograph 6, and the gas chromatograph 6 tests the component distribution of the oil and gas mixture. The heating jacket 13 adjusts the temperature of the oil and gas mixture, and the above experimental test process is repeated. The temperature, pressure and volume data measured by the PVT instrument 3 and the component distribution data measured by the gas chromatograph 6 can obtain the relationship between the temperature, pressure, volume and component of the oil and gas mixture.

[0047] Finally, it should be noted that: the above only for the preferred embodiments of the application, and not for the purpose of limiting the application, although the application has been described in detail with reference to the foregoing examples, for those skilled in the art, it still can be modified, or part of the technical features of the equivalent replacement. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the application, should be included in the protection scope of the application.

[0048] In addition to the technical features described in the specification, they are known to those skilled in the art.

Claims

1. An experimental system for measuring the PVTxy relationship of a multi-component mixture of heavy oil, characterized in that, This experimental system for measuring the PVTxy relationship of a multi-component mixture of heavy oil includes multiple equilibrium vessels, multiple gas storage tanks, a heavy oil tank, a sample collector, and a gas chromatograph. The gas storage tanks are connected to the equilibrium vessels and store different types of gases. The heavy oil tanks are connected to the equilibrium vessels and contain heavy oil. The different gases and heavy oil are mixed uniformly in the equilibrium vessels until equilibrium is reached, simulating oil-gas mixtures with different pressures, temperatures, volumes, and compositions. The sample collector is connected to each of the equilibrium vessels. After the oil-gas mixture in the equilibrium vessels reaches equilibrium, the mixture is collected. The gas chromatograph is connected to the sample collector to measure the component distribution of the oil-gas mixture collected by the sample collector. The equilibrium vessel includes an end cap, a PVT cylinder, an energized coil, and multiple free-rolling balls. The energized coil is wound around the outside of the PVT cylinder. When the energized coil is energized, it generates a magnetic field that causes the multiple free-rolling balls to move randomly within the PVT cylinder. By changing the direction of the current, the multiple free-rolling balls move up and down randomly, stirring the components within the PVT cylinder and promoting uniform distribution of the components. The end cap of the equilibrium vessel includes an end cap body, an injector, a sampling tube, and an oil injector. The injector is connected to the multiple gas storage tanks, the oil injector is connected to the heavy oil tank, and the sampling tube is connected to the sample collector. The outlet of the injector is located below the outlet of the oil injector. The oil injector and the injector work simultaneously to shorten the time for the oil-gas mixture to reach equilibrium.

2. The experimental system for measuring the PVTxy relationship of a heavy oil multi-component mixture according to claim 1, characterized in that, The experimental system for measuring the PVTxy relationship of a multi-component mixture of heavy oil also includes multiple high-precision pumps, which are respectively connected to the multiple gas storage tanks and the heavy oil tank to control the proportion of different types of gas and heavy oil introduced into the multiple equilibrium vessels.

3. The experimental system for measuring the PVTxy relationship of a multi-component mixture system in heavy oil according to claim 1, characterized in that, The experimental system for measuring the PVTxy relationship of a heavy oil multi-component mixture also includes multiple pressure measuring instruments located between the multiple balance vessels and the multiple gas storage tanks to detect the pressure of the multiple gas storage tanks.

4. The experimental system for measuring the PVTxy relationship of a heavy oil multi-component mixture according to claim 1, characterized in that, The experimental system for measuring the PVTxy relationship of a heavy oil multi-component mixture also includes a densitometer, which is connected to the plurality of equilibrium vessels to measure the density of the oil-gas mixture.

5. The experimental system for measuring the PVTxy relationship of a multi-component mixture system in heavy oil according to claim 1, characterized in that, The experimental system for measuring the PVTxy relationship of a heavy oil multi-component mixture also includes a sample collector, which is connected to the plurality of equilibrium vessels to collect oil-gas mixtures.

6. The experimental system for measuring the PVTxy relationship of a heavy oil multi-component mixture according to claim 1, characterized in that, The number of gas storage tanks is three, which store N2, CO2 and water vapor respectively.

7. The experimental system for measuring the PVTxy relationship of a multi-component mixture system of heavy oil according to claim 1, characterized in that, The experimental system for measuring the PVTxy relationship of a heavy oil multi-component mixture also includes a PVT instrument, which is connected to the multiple equilibrium vessels to monitor the pressure, temperature and volume of the oil-gas mixture to determine whether the oil-gas mixture has reached equilibrium.

8. The experimental system for measuring the PVTxy relationship of a heavy oil multi-component mixture according to claim 1, characterized in that, The balancing vessel also includes a bottom trough in which the plurality of free-rolling balls remain stationary without the action of an external magnetic field. The bottom trough is provided with a plurality of grooves that match the size of the plurality of free-rolling balls.

9. The experimental system for measuring the PVTxy relationship of a heavy oil multi-component mixture according to claim 1, characterized in that, The balance vessel also includes a heating jacket located outside the PVT cylinder and connected to the PVT instrument. The PVT instrument controls the operation of the heating jacket to set and monitor the temperature of the oil-gas mixing process inside the balance vessel.

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