With 35# lubricating oil

air and water as the test media

a pilot study was performed on the flow velocity and the flow field of the oil-air-water three-phase in a vertical rise pipeWhen water flow rate was 3.18 m3·h-1

air flow rate was 0.25 m3·h-1

oil flow rate was 0.4 m3·h-1

highspeed camera was used to get the photography of oilinwater flow pattern

track bubble and drip

and measure the flow velocity and flow fieldAt the same time the velocity was compared with the one obtained by using the crosscorrelation method in digital particle image velocimetry technique (DPIV)The test results showed relatively small errors in the flow velocity and flow field determined by the tracking bubble and drip method and the crosscorrelation methodIt can be used in the measurement of flow velocity and flow field of oil-air-water three-phase flow.