METHOD FOR DETERMINING PROFILE OF FLUID INFLUX AND PARAMETERS OF BOREHOLE ENVIRONMENT Russian patent published in 2012 - IPC E21B47/00 E21B47/06 

FIELD: oil and gas industry.

SUBSTANCE: well flow rate is changed in compliance with the method for determining the profile of fluid influx and parameters of borehole environment after continuous operation of the well with constant well flow rate during the time which is sufficient to provide minimum influence of production duration on speed of the next temperature change of the fluids supplied from productive formations to the well. Pressure on working face of the well is measured before and after the flow rate is measured. Temperature of influx of fluids supplied to the well is measured for each formation. Time versus fluid influx temperature graph and derivative versus influx temperature graph is built according to the logarithm of the time that passed after the flow rate change. As per the above derivative versus temperature graphs as per time logarithm there determined are the times when temperature derivative reaches constant value, and relative flow rates of formations are calculated as per mathematical expression. As per time versus fluid influx temperature graph there determined is fluid temperature change by this time, and skin factors of formations are calculated as per mathematical expression.

EFFECT: higher determination accuracy.

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