Oil-gas-water three phase flow continuously metering system

Abstract

This is a continuous measuring system of tri-phase flux that consists of oil, gas and water. The system comprises horizontal tri-phase analyzer, level gauge, electric control valve, hydraulic pump punching sand, gas flow counter, oil duct counter, watercourse counter, pressure sensor and so on. This invention can be used to measure tri-phase flux of oil, gas and water in the oil field. It is characterized by adopting horizontal tri-phase analyzer used in small-sized highly effective oil chamber internally-arranged, and adopts observing and controlling scheme of pressurization and stability of bi-liquid-level, keeping pressure, water-oil interface in the water header and liquid level of oil chamber stable, carrying-off the effect about the fluctuation of incoming gas flow or incoming liquid flow to the separating effect and measuring accuracy, increasing accuracy of flow discharged measuring and accomplishing series automatic gauging of oil, gas and water.

Description

technical field [0001] The invention is a continuous metering system of oil, gas and water three-phase flow. It is used for automatic and continuous measurement of oil, gas and water production in oil fields. Background technique [0002] With the deepening of oilfield development, especially after the oilfield enters the high water cut period, the gas production and liquid production of oil wells generally fluctuate greatly, and there are no rules to follow; low-yield oil wells also have intermittent liquid production, and the intermittent time varies. Short-term measurement is difficult to obtain the real output; oil well production varies greatly and fluctuates greatly, resulting in large difference and fluctuation in the output of associated gas in different oil wells; there are many sand and impurities in the oil well production fluid, which has a great impact on the instrument and its measurement . At present, the traditional metering system...

AI Technical Summary

Problems solved by technology

The defect of this prior art is: the first, utilize radiation attenuation instrument to measure gas-liquid ratio and oil-water ratio, instrument has radioactivity, volume is big, precision is low, and price is expensive

Second, the capacitance method is only applicable to the situation where the oil in the oil-gas-water mixture is the continuous phase, but at present, most oil fields in China have entered a high water cut period, and the capacitance method is no longer applicable when the water in the mixture is the continuous phase

Third, using a differential pressure sensor to measure the differential pressure of the pipeline can only obtain the total density of the oil-gas-water mixture in the sampling pipeline. It is necessary to deduce complex mathematical formulas to obtain the ratios of each phase. When the water content in the mixture is high, each phase The ratio calculation error is large and the measurement accuracy is low

The traditional three-phase separation metering system adopts the method of metering after three-phase separation of oil, gas and water, and its volume is generally large. The gas outlet of the separator adopts a self-operated pressure regulating valve to control the gas discharge, and the self-operated pressure regulating valve is mechanically operated and cannot be continuous. Smoothly adjust the internal pressure of the separator. When there is a large fluctuation in the incoming gas or liquid volume, it is easy to exceed the processing capacity of the system, resulting in poor separation effect and a serious drop in measurement accuracy.

This system has not been completely unattended, and it cannot automatically handle various failures, which increases the inconvenience of control and management.

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