Method for measuring flow of emulsion through combination of conductivity sensor and electromagnetic flowmeter

Abstract

The invention relates to a method for measuring the flow of emulsion through combination of a conductivity sensor and an electromagnetic flowmeter. The conductivity sensor is a focusing arc-shaped wall-to-wall type conductivity sensor. During data processing, voltage signals of the field focusing arc-shaped wall-to-wall type conductivity sensor under different flowing working conditions are subjected to normalization processing, and the moisture content measuring feature of the focusing arc-shaped wall-to-wall type conductivity sensor is extracted; a relation chart among the emulsion mixing flow rates measured by the electromagnetic flowmeter under the different flowing working conditions, the calibrated emulsion mixing flow rate and the moisture content is obtained according to a fitting function relation between the output voltage of the electromagnetic flowmeter under the all-water condition and the calibrated mixing flow rate; and by the adoption of the water holding ratio parameter measured by the field focusing arc-shaped wall-to-wall type conductivity sensor and the mixing flow rate parameter measured by the electromagnetic flowmeter, an oil-in-water emulsion drifting model is built, and the split-phase apparent velocity forecast is achieved.

Description

technical field [0001] The invention relates to a method for measuring the flow rate of oil-water two-phase flow of oil-in-water emulsion in wellbore under the action of surfactant flooding in the field of oil field dynamic monitoring. Background technique [0002] Due to the long-term use of water injection to exploit oil, the low-porosity and low-permeability oil and gas reservoirs in my country's old onshore oilfields have entered the middle and late stage of production, which is mainly characterized by low production and high water cut. By injecting surfactant aqueous solution into the formation to form an oil-water emulsion system, the oil recovery rate can be significantly improved. Therefore, the tertiary oil recovery technology based on surfactant flooding has been widely used in oil field production. Studying the flow measurement method of oil-water emulsion under the action of surfactant has important application significance for the well fluid production profile ...

AI Technical Summary

Problems solved by technology

However, the diameter of the oil droplets in the oil-in-water emulsion is mostly in the micron order, and it is very difficult to reconstruct the concentration distribution image of the micron-scale dispersed phase of the oil-in-water emulsion with the impedance imaging system

So far, there has been no report on the measurement method of the flow parameters of oil-in-water emulsions using a combination of field-focusing conductivity sensors and electromagnetic flowmeters.

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