Online rapid detection method for fluorescent microspheres in offshore oilfield produced liquid

The invention discloses an on-line rapid detection method for fluorescent microspheres in offshore oilfield produced liquid, which comprises the following steps: (1) producing water as a background within a period of time before microsphere fluorescence is not injected, and detecting the fluorescent light intensity in the background by taking the fluorescent light intensity as a reference; (2) after the microspheres are injected, online sampling is carried out according to a certain sampling period and sampling number, 1000ml of output liquid is sampled each time, the output liquid is centrifugally separated into an upper oil phase and a lower water phase, and the fluorescence intensity in the water phase is detected; (3) setting a monitoring period and monitoring time, acquiring multiple groups of water-phase fluorescence light intensity according to the step (2), taking an average value of the multiple groups of water-phase fluorescence light intensity as a fluorescent microsphere measured value, and compar