Three-phase flow of two immiscible liquids and a gas has been studied very little so far, even though this type of flow often occurs in the fields of petroleum production and boiling mixtures. A new method with the combination of horizontal-downward vertical tube and an orifice to measure the flowrates is presented. The measuring principle is that the frictional pressure drop in downward vertical tube is replaced by that in the horizontal tube, the void fraction is derived from the gravitational pressure drop, then the volume fraction of the individual phase can also be got. The individual flowrates can be calculated if the water fraction is available. This method is suitable to many kinds of oil wells to measure the flowrates of crude oil, natural gas and water. The parameters needing to be measured are less than that of other methods. According to the experimental results, this method has high accuracy, the measuring error is less than 10%, and it gets higher accuracy under the higher pressure conditions.
Experimental investigation of the measurement for oil, gas and water flowrates in three-phase slug flow
1997
6 Seiten, 7 Quellen
Conference paper
English
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