Online viscosity detection device and method for high-temperature and high-pressure thick oil-gas mixed fluid

The invention provides an online viscosity detection device and method for high-temperature and high-pressure thick oil-gas mixed fluid, and belongs to the technical field of petroleum and natural gas yield increase. The system comprises a circulating mechanism, a temperature control mechanism and a data acquisition and processing system, the circulating mechanism comprises a circulating pump, a high-temperature and high-pressure container, a dosing pump, a high-pressure reversing valve, an air compressor and a main pipeline, and the high-temperature and high-pressure container and the main pipeline are both connected with the high-pressure reversing valve; the dosing pump is used for injecting liquid in the high-temperature and high-pressure container into the main pipeline; the air compressor injects air into the main pipeline; and the circulating pump and the high-pressure reversing valve enable the oil-gas mixed fluid to circularly flow. The data collecting and processing system collects and processes phy