Experimental equipment for fracture-vuggy carbonate reservoir and use method

Abstract

The invention belongs to the technical field of petroleum engineering and rock physics experiments, and discloses experimental equipment for a fracture-vuggy carbonate reservoir and a use method.The equipment comprises a rock core model, the feeding end of the rock core model is connected with a storage container, and the storage container comprises a water storage container, a gas storage container, a chemical container and a polymer container; the storage container is connected with a micro pump; the feeding pipe is connected with a mixing kettle through a pipeline; the kettle inlet pipeline is connected with the mixing kettle; a first valve is arranged on a pipeline for connecting the storage container and the feeding pipe; a second valve is arranged between each storage container and the corresponding pumping pipe; a temperature sensor and a pressure sensor are respectively arranged at the top end of the core model; and one end, far away from the discharge pipe and the meter, of the multiphase separator is connected with each storage container through a return pipe. According to the method, the characteristics of the fractured-vuggy carbonate reservoir, the oil-gas migration behavior and the effective exploitation method can be better understood, the oil-gas exploitation process can be optimized, and the exploration and development efficiency can be improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of petroleum engineering and rock physics experiments, and particularly relates to an experimental device for a fracture-cave type carbonate rock reservoir and a use method thereof. BACKGROUND

[0002] Carbonate rock is an important oil and gas reservoir rock, and a fracture-cave type reservoir thereof refers to a reservoir in which there are certain degrees of fractures and pores, and these spaces play an important role in storing and flowing oil, natural gas and the like. A physical simulation experiment device is usually used to study and simulate characteristics of such a reservoir, fluid behavior and some key problems in oil and gas exploitation.

[0003] A conventional device can usually only simulate displacement of a single fluid phase, such as pure water displacement or pure gas displacement, and cannot simultaneously simulate mixing and interaction of multiple fluids, because it cannot simulate multiphase flow, such as simultaneous existence of water, oil and gas, and the like, resulting in that the experiment device cannot accurately reflect complex flow conditions of a field reservoir.

[0004] A patent application with a patent publication number of CN102748018A and a name of a physical simulation experiment device and method for heavy oil reservoir gas injection and huff and puff oil production discloses a device including an injection system, a model system, a production control system and a data acquisition and control system, the injection system is connected to the model system to inject formation water, crude oil and huff and puff gas into the model system, an outlet end of the model system is connected to the production control system, the production control system is used to control production amount of an oil and gas mixture of the model system, and measure gas flow and oil production in the produced oil and gas mixture, the model system is also connected to the data acquisition and control system, the data acquisition and control system is used to acquire pressure, temperature and huff and puff gas flow data in the model body and monitor and process data in real time. The patent application can simulate injection of gas into a formation, huff and puff and recovery process, but cannot realize simulation of characteristics of a fracture-cave type carbonate rock reservoir and oil and gas migration behavior, and cannot simulate mixed flow of different phases such as oil, water and gas. SUMMARY

[0005] The application aims to provide an experimental device for a fracture-cave type carbonate rock reservoir and a use method thereof, and by setting a physical simulation experiment device with a water storage container, a gas storage container, a chemical container and a polymer container, characteristics of a fracture-cave type carbonate rock reservoir, oil and gas migration behavior and effective production methods can be better understood, which is helpful to optimize oil and gas production technology and improve efficiency of exploration and development.

[0006] To achieve the above object, the technical scheme adopted by the application is as follows.

[0007] In a first aspect, the present application provides an experimental device for a fractured-vug carbonate reservoir, comprising: a core model, a feeding pipe connected to the feeding end of the core model, a storage container connected to the feeding pipe through a pipeline, wherein the storage container comprises a water storage container, a gas storage container, a chemical container and a polymer container; a pumping pipe connected to the storage container through a pipeline away from the feeding pipe, wherein the pumping pipe is connected to a micro pump; a mixing kettle connected to the feeding pipe through a pipeline, wherein a first pump is arranged on the pipeline; an inlet pipe connected to each side of the storage container close to the feeding pipe, wherein the inlet pipe is connected to the mixing kettle; a first valve arranged on the pipeline connecting the storage container and the feeding pipe; a second valve arranged between the storage container and the pumping pipe; a discharge pipe connected to the discharge end of the core model, wherein the other end of the discharge pipe is connected to a multi-phase separator, and the oil outlet end of the multi-phase separator is connected to a meter; a temperature sensor and a pressure sensor arranged at the top end of the core model; and the multi-phase separator is connected to each storage container through a return pipe away from the discharge pipe and the meter.

[0008] Optionally, the temperature sensor and the pressure sensor are electrically connected to an analyzer through wires away from the core model.

[0009] Optionally, a third valve is arranged on the pipeline between the first pump and the feeding pipe.

[0010] Optionally, a second pump is further connected to the oil inlet end of the core model; the other end of the second pump is connected to an oil tank; and a fourth valve is arranged on the pipeline connecting the second pump and the core model.

[0011] Optionally, a fifth valve is arranged on the pipeline connecting the multi-phase separator and the meter; a seventh valve is arranged on the pipeline connecting the storage container and the inlet pipe; and an eighth valve is arranged on the return pipe between the third pump and the multi-phase separator.

[0012] Optionally, a ninth valve is arranged on the discharge pipe; each storage container is connected to the return pipe through four pipelines, and a sixth valve is arranged on each of the four pipelines; and a third pump is arranged on the return pipe.

[0013] Optionally, the feeding pipe is connected to the water storage container, the gas storage container, the chemical container and the polymer container through four pipelines respectively through a six-way valve.

[0014] Optionally, a constant temperature and pressure box is arranged outside the core model.

[0015] In a second aspect, the present application provides a use method of the experimental device for the fractured-vug carbonate reservoir, comprising the following steps:

[0016] The substances stored in the water storage container, the gas storage container, the chemical container and the polymer container are pumped into the core model for displacement simulation, and then the produced liquid is collected by the meter;

[0017] The substances are pumped into the mixing kettle by using the displacement modes of water flooding combined with polymer flooding, chemical flooding combined with polymer flooding and gas flooding combined with water flooding, and then the produced liquid is collected by the meter after the displacement simulation.

[0018] After the experiment is completed, the liquid flowing out of the discharge pipe is separated by the multiphase separator, the crude oil is collected by the meter, and the other substances are sequentially pumped into the corresponding water storage container, the gas storage container, the chemical container and the polymer container.

[0019] Optionally, the displacement mode of water flooding combined with polymer flooding is that the substances in the water storage container and the polymer container are pumped into the mixing kettle, the displacement mode of chemical flooding combined with polymer flooding is that the substances in the chemical container and the polymer container are pumped into the mixing kettle by the micro pump, and the displacement mode of gas flooding combined with water flooding is that the substances in the water storage container and the gas storage container are pumped into the mixing kettle.

[0020] Compared with the prior art, the present application has the following beneficial effects:

[0021] The present application can realize multiphase mixed displacement, can simulate the mixed flow of different phases such as oil, water and gas, can better simulate the real conditions of the oil reservoir on site, the collected data can more comprehensively reflect the influence of multiphase flow on the reservoir dynamic, can provide more accurate analysis and prediction, and can evaluate and optimize various enhanced oil recovery technologies including mixed phase displacement.

[0022] Further, the top end of the core model is respectively provided with a temperature sensor and a pressure sensor, which can facilitate the simulation of the high temperature and high pressure environment of the core.

[0023] Further, the water storage container, the gas storage container, the chemical container and the polymer container are respectively connected with the return pipe through the pipelines, and the sixth valve is arranged on the four pipelines.

[0024] Further, the water storage container, the gas storage container, the chemical container and the polymer container are respectively connected with the return pipe through the pipelines, and the sixth valve is arranged on the four pipelines. BRIEF DESCRIPTION OF DRAWINGS

[0025] The drawings described herein are for purposes of illustration only and are not intended to limit the scope of the present disclosure in any way. Additionally, the shapes and proportions of the various components depicted in the drawings are not intended to be limiting, and are not necessarily drawn to scale. In the drawings:

[0026] Fig. 1 It is a schematic diagram of the overall structure of the experimental equipment for a fractured-vuggy carbonate reservoir under high temperature and high pressure according to the present application;

[0027] Fig. 2 It is a schematic diagram of the valve of the experimental equipment for a fractured-vuggy carbonate reservoir under high temperature and high pressure according to the present application;

[0028] Fig. 3 It is a schematic diagram of the constant temperature and pressure tank of the experimental equipment for a fractured-vuggy carbonate reservoir under high temperature and high pressure according to the present application.

[0029] 1, core model; 2, feeding pipe; 3, water storage container; 4, gas storage container; 5, chemical container; 6, polymer container; 7, mixing kettle; 8, pumping pipe; 9, micro pump; 10, first pump; 11, second pump; 12, oil tank; 13, discharge pipe; 14, multi-phase separator; 15, meter; 16, first valve; 17, second valve; 18, third valve; 19, fourth valve; 20, temperature sensor; 21, pressure sensor; 22, wire; 23, analyzer; 24, fifth valve; 25, return pipe; 26, sixth valve; 27, seventh valve; 28, third pump; 29, eighth valve; 30, constant temperature and pressure tank; 31, ninth valve; 32, kettle inlet pipeline. DETAILED DESCRIPTION

[0030] In order to make the personnel in the technical field better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work should belong to the scope of protection of the present application.

[0031] It should be noted that when an element is referred to as being “disposed on” another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being “connected” to another element, it can be directly connected to the other element or there can be an intervening element. The terms “vertical”, “horizontal”, “left”, “right”, and similar expressions used herein are for purposes of illustration only and are not intended to be limiting.

[0032] 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. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0033] The application will be described in detail below with reference to the drawings.

[0034] As Figs. 1-3 shown, the experimental equipment of the fractured-vug carbonate reservoir under high temperature and high pressure includes a core model 1, a feeding pipe 2 connected to the feeding end of the core model 1, and a storage container connected to the feeding pipe 2 through a pipeline.

[0035] The storage container includes a water storage container 3, a gas storage container 4, a chemical container 5, and a polymer container 6, which can simulate the mixed flow of different phases respectively and better simulate the real conditions of the field reservoir.

[0036] The end of the storage container away from the feeding pipe 2 is connected to a pumping pipe 8 through a pipeline, the pumping pipe 8 is connected to a micro pump 9, the feeding pipe 2 is connected to a mixing kettle 7 through a pipeline, and the pipeline is provided with a first pump 10, and the side of the end of the storage container close to the feeding pipe 2 is connected to a kettle inlet pipeline 32 through a pipeline, and the kettle inlet pipeline 32 is connected to the mixing kettle 7.

[0037] The pipeline connected to the feeding pipe 2 of the storage container is provided with a first valve 16, and the pipeline between the storage container and the pumping pipe 8 is provided with a second valve 17. The first valve 16 and the second valve 17 can facilitate the separate control of the discharge of each storage container.

[0038] The discharge end of the core model 1 is connected to a discharge pipe 13, the other end of the discharge pipe 13 is connected to a multi-phase separator 14, the oil outlet end of the multi-phase separator 14 is connected to a meter 15, and the top end of the core model 1 is provided with a temperature sensor 20 and a pressure sensor 21 respectively, which can facilitate the simulation of the high temperature and high pressure environment of the core.

[0039] The end of the multi-phase separator 14 away from the discharge pipe 13 and the meter 15 is connected to each storage container through a return pipe 25.

[0040] Specifically, the water storage container 3, gas storage container 4, chemical container 5, and polymer container 6 are each connected to the return pipe 25 via pipes, and each of these four pipes is equipped with a sixth valve 26. The side of each of the water storage container 3, gas storage container 4, chemical container 5, and polymer container 6 near the feed pipe 2 is connected to an inlet pipe 32, which is connected to the mixing vessel 7. A seventh valve 27 is installed on the pipe connecting the water storage container 3, gas storage container 4, chemical container 5, and polymer container 6 to the inlet pipe 32.

[0041] The sixth valve 26 allows for convenient control of the entry of different storage containers into the metering device 15. The seventh valve 27 allows for convenient control of the entry of different storage containers into the mixing vessel 7.

[0042] The present invention discloses a method for using an experimental apparatus for fractured-vuggy carbonate reservoirs, comprising the following steps:

[0043] The substances stored in the water storage container 3, gas storage container 4, chemical container 5 and polymer container 6 are pumped into the core model 1 for displacement simulation, and the produced liquid is collected through the metering device 15 respectively.

[0044] The material was pumped into the mixing vessel 7 using water flooding, chemical flooding, and a combination of gas flooding and polymer flooding, respectively. After mixing, it was pumped into the core model 1 for displacement simulation. Finally, the produced liquid was collected through the metering device 15.

[0045] After the experiment was completed, the liquid flowing out through the discharge pipe 13 was separated by the multiphase separator 14. The crude oil entered the metering device 15, and the other substances were pumped into the corresponding water storage container 3, gas storage container 4, chemical container 5 and polymer container 6 in sequence.

[0046] Specifically, the displacement method combining water flooding and polymer flooding is as follows: the substances in the water storage container 3 and the polymer container 6 are pumped into the mixing vessel 7, respectively; the displacement method combining chemical flooding and polymer flooding is as follows: the substances in the chemical container 5 and the polymer container 6 are pumped into the mixing vessel 7 through the micro pump 9, respectively; the displacement method combining gas flooding and water flooding is as follows: the substances in the water storage container 3 and the gas storage container 4 are pumped into the mixing vessel 7, respectively.

[0047] In step S1, the first valve 16 and the second valve 17 of the water storage container 3, the gas storage container 4, the chemical container 5, and the polymer container 6 are opened sequentially and individually, while the first valve 16 and the second valve 17 of the other storage containers are closed at the same time; and the sixth valve 26 and the seventh valve 27 are closed at the same time.

[0048] In step S2, in the displacement method combining water drive and polymer drive, the seventh valve 27 and the second valve 17 of the water storage container 3 and the polymer container 6 are opened, while the seventh valve 27 and the second valve 17 of the gas storage container 4 and the chemical container 5 are closed.

[0049] In the displacement method combining chemical flooding and polymer flooding, the seventh valve 27 and the second valve 17 of the chemical container 5 and the polymer container 6 are opened, while the seventh valve 27 and the second valve 17 of the water storage container 3 and the gas storage container 4 are closed.

[0050] In the displacement method combining gas drive and water drive, the seventh valve 27 and the second valve 17 of the water storage container 3 and the gas storage container 4 are opened, while the seventh valve 27 and the second valve 17 of the chemical container 5 and the polymer container 6 are closed.

[0051] Example 1

[0052] like Figs. 1-3 As shown, the present invention provides an experimental device for fractured-vuggy carbonate reservoirs under high temperature and high pressure, comprising a core model 1, wherein the feed end of the core model 1 is connected to a feed pipe 2, the core model 1 is set inside a constant temperature and pressure chamber 30, and the feed pipe 2 is connected to a water storage container 3, a gas storage container 4, a chemical container 5 and a polymer container 6 respectively through a six-way valve via four pipes.

[0053] The ends of the water storage container 3, the gas storage container 4, the chemical container 5, and the polymer container 6 that are away from the feed pipe 2 are all connected to a pumping pipe 8 through a pipe, and the other end of the pumping pipe 8 is connected to a micro pump 9.

[0054] The mixing vessel 7 is connected to the feeding pipe 2 by a pipeline, and a first pump 10 is installed on the pipeline. A third valve 18 is installed on the pipeline between the first pump 10 and the feeding pipe 2.

[0055] A first valve 16 is installed between the water storage container 3, the gas storage container 4, the chemical container 5, and the polymer container 6 and the feeding pipe 2; a second valve 17 is installed between the water storage container 3, the gas storage container 4, the chemical container 5, and the polymer container 6 and the pumping pipe 8.

[0056] The oil inlet end of the core model 1 is also connected to a second pump 11; the other end of the second pump 11 is connected to an oil tank 12. A fourth valve 19 is installed on the pipeline connecting the second pump 11 and the core model 1.

[0057] The discharge end of the core model 1 is connected to a discharge pipe 13, and a ninth valve 31 is installed on the discharge pipe 13. The end of the discharge pipe 13 away from the core model 1 is connected to a multiphase separator 14, and the oil outlet end of the multiphase separator 14 is connected to a metering device 15. A fifth valve 24 is installed on the pipe connecting the multiphase separator 14 and the metering device 15.

[0058] Each of the water storage container 3, gas storage container 4, chemical container 5, and polymer container 6 has an inlet pipe 32 connected to the side of the container near the feed pipe 2 via a pipe. The inlet pipe 32 is connected to the mixing vessel 7. A seventh valve 27 is installed on the pipe connecting the water storage container 3, gas storage container 4, chemical container 5, and polymer container 6 to the inlet pipe 32.

[0059] Temperature sensor 20 and pressure sensor 21 are respectively installed at the top of core model 1. The ends of temperature sensor 20 and pressure sensor 21 away from core model 1 are electrically connected to analyzer 23 through wire 22.

[0060] The end of the multiphase separator 14 furthest from the discharge pipe 13 and the metering device 15 is connected to the water storage container 3, the gas storage container 4, the chemical container 5 and the polymer container 6 respectively through the return pipe 25.

[0061] The water storage container 3, gas storage container 4, chemical container 5 and polymer container 6 are respectively connected to the return pipe 25 through pipes, and each of these four pipes is equipped with a sixth valve 26.

[0062] A third pump 28 is installed on the return pipe 25, and an eighth valve 29 is installed on the return pipe 25 between the third pump 28 and the multiphase separator 14.

[0063] During the experiment, the substances stored in the water storage container 3, gas storage container 4, chemical container 5 and polymer container 6 were pumped into the core model 1 through the micro pump 9 for displacement simulation, and the produced liquid was collected through the meter 15.

[0064] After the experiment, the liquid flowing out through the discharge pipe 13 is separated by the multiphase separator 14. The crude oil enters the metering device 15, while the other substances are pumped sequentially into the corresponding water storage container 3, gas storage container 4, chemical container 5, and polymer container 6 by the third pump 28.

[0065] During the miscible displacement process, the chemicals are fed into the water storage container 3, the gas storage container 4, the chemical container 5, and the polymer container 6 through different pipelines and corresponding numbers of third pumps 28.

[0066] Example 2

[0067] In this embodiment, a single-phase displacement is first performed, with a single pipeline and a corresponding number of third pumps 28 individually delivering the contents to the corresponding water storage container 3, gas storage container 4, chemical container 5, and polymer container 6.

[0068] During the experiment, the substances stored in the water storage container 3, gas storage container 4, chemical container 5 and polymer container 6 were pumped into the core model 1 through the micro pump 9 for displacement simulation, and the produced liquid was collected through the meter 15.

[0069] The flow rate formula is used to describe the flow rate of fluid through a pipe, as follows:

[0070] Q = A / v

[0071] Where Q is the flow rate, A is the cross-sectional area of ​​the pipe, and v is the flow velocity.

[0072] When using a displacement method that combines water flooding and polymer flooding, the substances in the water storage container 3 and the polymer container 6 are pumped into the mixing vessel 7 through the micro pump 9. After mixing, they are pumped into the core model 1 through the first pump 10 for displacement simulation. Finally, the produced liquid is collected through the metering device 15.

[0073] The combined waterflooding and polymer flooding method is particularly suitable for reservoirs with low waterflooding efficiency and can improve the recovery rate of remaining oil.

[0074] When using a combination of chemical and polymer flooding, the substances in the chemical container 5 and the polymer container 6 are pumped into the mixing vessel 7 via a micro pump 9. After mixing, the mixture is pumped into the core model 1 via a first pump 10 for displacement simulation. Finally, the produced fluid is collected via a metering device 15. The combination of chemical and polymer flooding is particularly suitable for improving the oil-water interface efficiency in complex reservoirs and increasing the fluidity of crude oil.

[0075] The formula for calculating the concentration of a mixture is used to calculate the final concentration of two substances after mixing, as follows:

[0076] Cf = m1 / C1 + m2 / C2 / m1 + m2

[0077] Where Cf is the final concentration, m1 and m2 are the masses of each substance, and C1 and C2 are the initial concentrations of each substance.

[0078] When using a displacement method that combines gas and water drive, the substances in the water storage container 3 and the gas storage container 4 are pumped into the mixing vessel 7 through the micro pump 9. After mixing, they are pumped into the core model 1 through the first pump 10 for displacement simulation. Finally, the produced liquid is collected through the metering device 15.

[0079] The displacement efficiency formula is used to calculate the efficiency in displacement simulations, as follows:

[0080] E = Vr / Vi / ti * 100%

[0081] Where E is efficiency, Vr is the volume of produced liquid, Vi is the volume of injected liquid, and ti is the number of pumping cycles.

[0082] The pumping rate control formula is used to calculate the rate at which materials are pumped, as follows:

[0083] Q = V / t

[0084] Where Q is the pumping rate, V is the pumped volume, and t is the pumping time.

[0085] For certain special reservoirs, using a combination of gas flooding and water flooding can reduce gas overflow and improve oil recovery.

[0086] After the experiment, the liquid flowing out through the discharge pipe 13 is separated by the multiphase separator 14. The crude oil enters the metering device 15, while the other substances are pumped sequentially into the corresponding water storage container 3, gas storage container 4, chemical container 5, and polymer container 6 by the third pump 28. During the mixed-phase displacement, the liquid is sent into the water storage container 3, gas storage container 4, chemical container 5, and polymer container 6 through different pipelines and the corresponding number of third pumps 28. During the single-phase displacement, the liquid is sent into the corresponding water storage container 3, gas storage container 4, chemical container 5, and polymer container 6 through a single pipeline and the corresponding number of third pumps 28.

[0087] The flow control formula for branch flow is used to describe the sum of the flow rates of multiple branch flow sources in a pipeline, as follows:

[0088] Qt = Q1 + Q2 + ... + Qn

[0089] Where Qt is the total traffic, and Q1+Q2+...+Qn is the traffic of each branch.

[0090] Unless otherwise specified, the equipment components involved in the above embodiments are all conventional equipment components, and the structural settings, working methods or control methods involved are all conventional settings, working methods or control methods in the art unless otherwise specified.

[0091] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solutions of the present invention, as long as they do not depart from the spirit and scope of the technical solutions of the present invention, should be covered within the scope of the claims of the present invention.

Claims

1. An experimental apparatus for fractured-vuggy carbonate reservoirs, characterized in that, include: A core model (1) is provided, with a feeding pipe (2) connected to the feed end of the core model (1). The feeding pipe (2) is connected to a storage container via a pipe. The storage container includes a water storage container (3), a gas storage container (4), a chemical container (5), and a polymer container (6). The end of the storage container away from the feeding pipe (2) is connected to a pumping pipe (8) via a pipe. The pumping pipe (8) is connected to a micro pump (9). The feeding pipe (2) is connected to a mixing vessel (7) via a pipe, and a first pump (10) is installed on the pipe. The side of the storage container near the feeding pipe (2) is connected to an inlet pipe (32) via a pipe. (32) Connected to the mixing vessel (7); a first valve (16) is provided on the pipe connecting the storage container and the feeding pipe (2); a second valve (17) is provided between the storage container and the pumping pipe (8); the discharge end of the core model (1) is connected to the discharge pipe (13), the other end of the discharge pipe (13) is connected to the multiphase separator (14), and the oil outlet end of the multiphase separator (14) is connected to the meter (15); a temperature sensor (20) and a pressure sensor (21) are respectively provided at the top of the core model (1); the end of the multiphase separator (14) away from the discharge pipe (13) and the meter (15) is connected to each storage container through the return pipe (25).

2. The experimental apparatus for fractured-vuggy carbonate reservoirs according to claim 1, characterized in that, The ends of the temperature sensor (20) and pressure sensor (21) away from the core model (1) are electrically connected to the analyzer (23) via wires (22).

3. The experimental apparatus for fractured-vuggy carbonate reservoirs according to claim 1, characterized in that, A third valve (18) is installed on the pipeline between the first pump (10) and the feed pipe (2).

4. The experimental apparatus for a fractured-vuggy carbonate reservoir according to claim 1, characterized in that, The oil inlet end of the core model (1) is also connected to a second pump (11); the other end of the second pump (11) is connected to an oil tank (12); a fourth valve (19) is installed on the pipeline connecting the second pump (11) and the core model (1).

5. The experimental apparatus for a fractured-vuggy carbonate reservoir according to claim 1, characterized in that, A fifth valve (24) is installed on the pipe connecting the multiphase separator (14) and the meter (15); a seventh valve (27) is installed on the pipe connecting the storage container and the inlet pipe (32); and an eighth valve (29) is installed on the return pipe (25) between the third pump (28) and the multiphase separator (14).

6. The experimental apparatus for a fractured-vuggy carbonate reservoir according to claim 1, characterized in that, The discharge pipe (13) is equipped with a ninth valve (31); each storage container is connected to the return pipe (25) through four pipes, and each of the four pipes is equipped with a sixth valve (26); the return pipe (25) is equipped with a third pump (28).

7. The experimental apparatus for a fractured-vuggy carbonate reservoir according to claim 1, characterized in that, The feeding pipe (2) is connected to a water storage container (3), a gas storage container (4), a chemical container (5), and a polymer container (6) via four pipes through a six-way valve.

8. The experimental apparatus for fractured-vuggy carbonate reservoirs according to claim 1, characterized in that, A constant temperature and pressure chamber (30) is installed outside the core model (1).

9. A method of using the experimental apparatus for fractured-vuggy carbonate reservoirs as described in any one of claims 1 to 8, characterized in that, Includes the following steps: The substances stored in the water storage container (3), gas storage container (4), chemical container (5) and polymer container (6) are pumped into the core model (1) for displacement simulation, and the produced liquid is collected through the meter (15). The material was pumped into the mixing vessel (7) using displacement methods that combined water flooding and polymer flooding, chemical flooding and polymer flooding, and gas flooding and water flooding, respectively. After mixing, the material was pumped into the core model (1) for displacement simulation. Finally, the produced liquid was collected through the meter (15). After the experiment was completed, the liquid flowing out through the discharge pipe (13) was separated by the multiphase separator (14). The crude oil entered the metering device (15), and the other substances were pumped into the corresponding water storage container (3), gas storage container (4), chemical container (5) and polymer container (6) in sequence.

10. The method of using the experimental equipment for fractured-vuggy carbonate reservoirs according to claim 9, characterized in that, The displacement method combining water flooding and polymer flooding is as follows: the substances in the water storage container (3) and the polymer container (6) are pumped into the mixing vessel (7) respectively; the displacement method combining chemical flooding and polymer flooding is as follows: the substances in the chemical container (5) and the polymer container (6) are pumped into the mixing vessel (7) respectively through a micro pump (9); the displacement method combining gas flooding and water flooding is as follows: the substances in the water storage container (3) and the gas storage container (4) are pumped into the mixing vessel (7) respectively.

Images