Western Atlas International, Inc.

Mohammad J Davarzani

Norman R Carlson

Method and apparatus are disclosed for determining the water cut of an oil-water flow in a wellbore having a known deviation angle less than 90. A first step includes generating a set of predicted response curves where each response curve relates discrete selected values of the water cut to test values representative of a value of the flow mixture functionally related to measured responses of a selected logging instrument capable of distinguishing between the water and oil phases of the flow mixture for a selected oil-water total flow rate and at a borehole deviation within a selected range of deviation values that include the known borehole deviation. Then the selected logging instrument combination is introduced into the borehole for measuring the total flow rate of the oil-water mixture and the values representative of the responses of the selected logging instrument distinguishing between the oil and water phases of the oil-water mixture. A value functionally related to the measured value representative of the responses of the selected logging instrument is generated. From the set of predicted response curves an estimated value of the water cut of the oil-water mixture at the measured borehole total flow rate of the oil-water mixture is determined in response to the generated value functionally related to the measured value representative of the responses of the selected logging tool.

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Houston, TX, United States of America

Mohammad J Davarzani