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02500 PREDICTING OF WATER FILM THICKNESS AND VELOCITY FOR CORROSION RATE CALCULATION IN OIL-WATER FLOWS

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Product Number: 51300-02500-SG
ISBN: 02500 2002 CP
Author: Hua Shi, Hongbin Wang, W. Paul Jepson, and Lee D Rhyne
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Experiments studying oil-water flows were conducted in a 10-cm diameter, 40-m long, horizontal pipeline. Oil (viscosity 3 cP at 25°C) and ASTM substitute seawater were used at superficial mixture velocities ranging from 0.4 to 3.0m/s. in situ water cut and in situ velocity along the pipe across section have been measured at a temperature of 25°C and a carbon dioxide partial pressure of 0.13 MPa for a whole range of water cut. A novel mathematical segregated flow model, four-layer/phase was then developed for intermediate oil-water flow patterns of semi-segregated, semi-mixed and mixed as a three-phase model by incorporating experimental data. The mixed layer in the three-layer/phase model is further divided into water-in-oil (oil-continuous) and oil-in-water (water-continuous) layers by the phase inversion point. The experimental data are in good agreement with the predicted water film height from the model. Keywords: corrosion, large diameter pipe, multiphase flow, oil-water flow, phase inversion, segregated flow model, three-layer/phase model, four-layer/phase model
Experiments studying oil-water flows were conducted in a 10-cm diameter, 40-m long, horizontal pipeline. Oil (viscosity 3 cP at 25°C) and ASTM substitute seawater were used at superficial mixture velocities ranging from 0.4 to 3.0m/s. in situ water cut and in situ velocity along the pipe across section have been measured at a temperature of 25°C and a carbon dioxide partial pressure of 0.13 MPa for a whole range of water cut. A novel mathematical segregated flow model, four-layer/phase was then developed for intermediate oil-water flow patterns of semi-segregated, semi-mixed and mixed as a three-phase model by incorporating experimental data. The mixed layer in the three-layer/phase model is further divided into water-in-oil (oil-continuous) and oil-in-water (water-continuous) layers by the phase inversion point. The experimental data are in good agreement with the predicted water film height from the model. Keywords: corrosion, large diameter pipe, multiphase flow, oil-water flow, phase inversion, segregated flow model, three-layer/phase model, four-layer/phase model
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