A method of determination of fluid influx profile and near-wellbore space parameters

The method enables the determination of the fluids' influx parameters and parameters of the near-wellbore areas in multi-layered reservoirs. A bottom hole pressure is measured. After a long-term operation of the well at a constant production rate For a predetermined time after which the production rate is changed. The predetermined time being a time sufficient to provide a minimum influence of the production time on the rate of the subsequent change of the temperature of the fluids flowing from the production layers into the wellbore. The bottom hole pressure and the temperature of each layer are measured after the change in production rate. The graphs of temperature variation with time are plotted and relative flow rates and skin factors of the layers are calculated using points where temperature derivatives are stable.