Constant-volume tube piston type oil, gas and water three-phase flow meter on basis of gas and liquid pre-separation and measuring method

Abstract

The invention provides a constant-volume tube piston type oil, gas and water three-phase flow meter on the basis of gas and liquid pre-separation. The constant-volume tube piston type oil, gas and water three-phase flow meter comprises a gas and liquid separation portion, a wet natural gas metering portion and an oil and water two-phase flow metering portion. The gas and liquid separation portion comprises a cyclone machine, a buffer tank and a drain valve; the wet natural gas metering portion comprises a constant-volume cylindrical metering tube, and a piston capable of moving up and down is arranged in the constant-volume cylindrical metering tube; two electromagnetic valves for controlling gas inflow, exhaust and reversing are respectively connected to two ends of the metering tube of the wet natural gas metering portion; temperature and pressure transmitters are further mounted on the metering tube of the wet natural gas metering portion; the oil and water two-phase metering portion comprises a vertical constant-volume cylindrical metering tube, and a piston capable of moving up and down is arranged in the vertical constant-volume cylindrical metering tube; two electric valves for controlling liquid inflow, drainage and reversing are respectively connected to two ends of the metering tube of the oil and water two-phase flow metering portion; temperature and pressure difference transmitters are further mounted on the metering tube of the oil and water two-phase flow metering portion. The constant-volume tube piston type oil, gas and water three-phase flow meter has the advantages that flow of oil, gas and water can be metered in an online manner by the aid of the constant-volume tube piston type oil, gas and water three-phase flow meter, and the constant-volume tube piston type oil, gas and water three-phase flow meter is high in precision and free of radioactive rays owing to a volume type metering means.

Description

technical field [0001] The invention belongs to the technical field of multiphase flow measurement of crude oil well production fluid, and relates to a constant volume tube piston type oil-gas-water three-phase flowmeter based on gas-liquid pre-separation and a measurement method. Background technique [0002] Crude oil well production fluid mainly contains oil, natural gas, water and other media. When it is transported in pipelines, whether it is oil-gas-water three-phase mixed transport, oil-water two-phase transport or natural gas wet gas transport, it is a typical multiphase flow problem. [0003] The oil-gas-water multiphase flowmeter is an instrument for measuring the flow of oil, gas, and water three-phase media when the crude oil exploited in the oilfield is transported in the pipeline, and can be widely used in onshore oilfields and offshore oil industries. Due to the complexity of multiphase flow, the development of oil, gas and water multiphase flowmeters is more ...

AI Technical Summary

Problems solved by technology

Most of the currently commercialized three-phase flowmeters have phase density, phase holdup and phase velocity measurement components to facilitate the measurement of the mass flow of each phase fluid, but for the flow and phase of oil well production fluid In the occasions where the holdup fluctuation range is large and the flow is complex, the application of the existing technology is still very difficult

At present, the effective phase holdup measurement of multiphase flowmeter mainly relies on radiation technology, but in recent years, my country has greatly improved the supervision of the use of radiation, and discouraged the use of radiation. Quite wary and generally unwelcome

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