Vorrichtung und Verfahren zum Steuern des Wasserprozentsatzes.

摘要

Fluid from an oil well being tested is allowed to accumulate in a settling tank and, after a predetermined settling time, is pumped through a flowmeter (25) and a water-cut meter (30). The water-cut meter first determines the impedance of the free water pumped from the tank and later determines the impedance of the oil/water emulsion flowing from the tank. The ratio of the emulsion impedance to the free water impedance is proportional to percent water-cut of the fluid during the water-continuous phase. When the flowing emulsion becomes an oil-continuous phase, the system utilizes probe impedance for the water-cut determination. The water-cut and flow rate signals are combined to calculate the total oil and water content of the settling tank fluid. The magnitude of the phase difference between high frequency current and voltage probe signals is used to determine the point at which the flowing emulsion becomes an oil-continuous phase.