Method and arrangement for oil well test system

An arrangement for calculating the fluid phase fractions of gas, oil and water and the oil-water emulsion interface in an oil well stream which comprises:

• an elongate vertically arranged sampling chamber having an inlet for receiving a well stream sample and an outlet for purging a sample from said sampling chamber;
• an electrically nonconductive hollow tube extending vertically through the sampling chamber;
• a source of pressurizable conductive fluid selectively connectable to the lower end of the hollow tube for selectively introducing such fluid into the tube while a well steam sample is present in the sampling chamber;
• a plurality of capacitance indicators arranged at discrete spaced locations vertically within the hollow tube;
• capacitance measuring circuitry electrically coupled to the plurality of capacitance indicators to generate values representative of changing capacitance as the fluid fills the chamber, and
• data processing means coupled to the capacitance measuring circuitry for utilizing capacitance values to compute the phase fractions of gas, oil and water and oil-water emulsion for a well steam sample.