Method study of the production well, based on the study of the formation fluid in the parameters of the axial flux mixture and comprising moving the device into the perforation interval, measuring density of the mixture consisting of an integrated device, binding depth readings and the solution geological tasks registered curves, characterized in that, with in order to increase the reliability of solutions geological problems in marginal wells by increasing the sensitivity of the method, create mode mechanical degassing fluid at d renirovanii formation and measuring the change in the dynamic viscosity of the mixture at a level tributary slot when mixed radial and axial fluid flow, and temperature of this mixture, the dynamic viscosity of the mixture is measured using a vibratory resonator flow-submerged type, arranged along the axis of the instrument, followed by determination of the kinematic viscosity mixture with regard to its density and temperature, wherein the measurement is carried out at a different mechanical degassing fluid mode by changing the drawdown with the possibility awn register multiple curves kinematic viscosity in the range of perforations, which decide and geological problems.
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