a first simulation method:

(1) production of a microfluidic chip:

1) manufacturing a casting body slice by extracting a core rock sample from an actual reservoir stratum, and extracting a pore crack structure through microscope imaging;

2) etching the microfluidic chip according to the pore crack structure to produce a glass plate etching microscopic model;

3) gluing the other glass plate having an injection hole and a fluid extraction hole through vacuum bonding to obtain a microfluidic chip representing a real reservoir pore structure;

(2) saturating the liquid sulfur in the microfluidic chip:

placing the microfluidic chip in a high-temperature high-pressure visible reaction kettle, filling a sulfur intermediate container with sulfur powder, heating and melting the sulfur powder to a liquid sulfur state, and injecting the liquid sulfur into the microfluidic chip at high temperature until the liquid sulfur is saturated;

(3) cleaning the pipeline with nitrogen gas:

closing the connection route of the microfluidic chip and the three-way valve, and simultaneously opening the branch on the other side, so that the three-way valve is in direct communication with the back-pressure valve; nitrogen gas in the gas intermediate container bypasses the microfluidic chip along the branch and through the three-way valve, and directly flows into a recovery device through the back-pressure valve to clean the residual liquid sulfur in the processing pipeline until no liquid sulfur is generated in the recovery device; to avoid the influence of the liquid sulfur in the pipeline on the sulfur saturation in the micro-fluid control chip when the liquid sulfur is displaced by nitrogen gas;

(4) simulation of gas drive liquid sulfur:

adjusting a three-way valve, such that the three-way valve is in communication with the microfluidic chip, injecting nitrogen gas into the microfluidic chip, and acquiring a simulated state of gas-liquid sulfur two-phase flow through a high-speed camera;

(5) washing the pipeline with water:

closing the connection route of the three-way valve and the microfluidic chip, and simultaneously opening the branch on the other side, so that the three-way valve is in direct communication with the back-pressure valve; the water in the water intermediate container bypasses the microfluidic chip along the branch and through the three-way valve, and directly flows into a recovery device through the back-pressure valve to clean the residual gas in the processing pipeline until no obvious bubble is generated in the recovery device; to avoid the influence of the residual gas in the pipeline on the gas-liquid sulfur saturation in the microfluidic chip when the residual gas is displaced by water;

(6) liquid sulfur-gas-water three-phase simulation under the condition of driving the gas-liquid sulfur with water:

adjusting the three-way valve, such that the three-way valve is in communication with the microfluidic chip, injecting distilled water into the microfluidic chip, and acquiring a simulated state of liquid sulfur-gas-water three-phase flow through the high-speed camera;

or, a second simulation method:

the method is performed after steps (1) to (3) of the first simulation method:

(7) liquid sulfur-gas-water three-phase flow simulation under the condition of gas-water alternate injection:

the step is performed after steps (1) to (3), alternately opening a water intermediate container and a gas intermediate container to carry out the gas-water alternate displacement until the stable state, and acquiring a simulated state of liquid sulfur-gas-water three-phase flow through the high-speed camera;

the simulation device for liquid sulfur-gas-water multiphase flow comprising an injection unit, a high-temperature high-pressure visible reaction kettle, and a data acquisition unit;

the injection unit comprises an intermediate container, the intermediate container comprising a sulfur intermediate container, a water intermediate container, and a gas intermediate container;

the high-temperature high-pressure visible reaction kettle comprises a microfluidic chip, and the high-temperature high-pressure visible reaction kettle is connected with one end of the intermediate connector through a three-way valve G, to inject the fluid of the intermediate connector into the microfluidic chip through a connecting pipeline;

the data acquisition unit comprises a high-speed camera arranged right above the high-temperature high-pressure visible reaction kettle, and a computer connected with the high-speed camera, in order to observe the fluid changes in the microfluidic chip with real-time imaging.