Abstract
Summary A new method of obtaining three-phase holdup (oil/water/gas) information in horizontal wells has been field tested. The method uses the data available from a pulsed-neutron tool. This measurement uses the inelastic near/far countrate ratio in addition to the near and far carbon/oxygen (C/O) ratios. The inelastic near/far countrate ratio response is dominated by gas in the borehole, whereas the near and far C/O ratios are used to separate the water and oil contributions of the borehole and formation. By using a linear programming approach, this information is combined to produce quantitative three-phase holdup answers. Calibration ofthe measurement is achieved by the combined use of laboratory measurements and Monte Carlo modeling predictions. To obtain independent verification of the three-phase holdup answer, a local probe tool was run in combination with the pulsedneutron tool. The local probe tool is sensitive to two phases (water and hydrocarbon) and, hence, can be used for a partial verification of results. Field-test results show good agreement between the two independent measurements under various conditions of gas, oil, and water holdup in the horizontal borehole.
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