Multiphase flow measurement method based on double-section impedance type long waist cone sensor

The invention belongs to the fluid measurement technology field and relates to a multiphase flow measurement method based on a double-section impedance type long waist cone sensor. The adopted sensor comprises a cone throttling element, a systolic blood pressure drop differential pressure transmitter, a permanent pressure loss differential pressure transmitter and an electrical sensitive sensor. The method comprises the following steps: collecting two pairs of differential pressure signals generated by the cone throttling element; utilizing the electrical sensitive sensor to collect an electrical signal; calculating the total mass flow rate, the each-phase mass flow rate and the each-phase mass content according to a double-differential pressure model of a single throttling element; utilizing a support vector machine to realize classify, identify and pre-judge a flow pattern according to the measurement data of the differential pressure signals and the electrical signal; adopting a capacitance model to measure a mixed fluid dielectric constant; adopting a conductivity model to measure the mixed fluid conductivity; and calculating the procedure parameter of oil-gas-water three-phase flow. The multiphase flow measurement method is not influenced by the fact that whether a multiphase flow continuous phase is conducted or not, has the characteristics of high measurement precision,high reliability and the like and can obtain more measurement information.