Oil, gas and water three phase oil well continuous metering device and its measurement method

Abstract

The invention belongs to the fluid measuring technical field and relates to an oil, gas and water three-phase oil well continuous gauging device, which comprises a high-efficient gas-liquid separator; the high-efficient gas-liquid separator is connected with an oil, gas and water three-phase inflowing port; a gas phase outlet of the oil, gas and water three-phase inflowing port is connected with a gas phase measuring pipeline; a gas path temperature sensor, a gas path pressure sensor and a gas path endocone flowmeter with high-frequency differential pressure transmitter are arranged on the gas phase measuring pipeline; a liquid phase outlet of the high-efficient gas-liquid separator is connected with a liquid phase measuring pipeline; a liquid path Coriolis mass flowmeter and a liquid path endocone flowmeter are arranged on the liquid phase measuring pipeline; and the cross section of the pipeline for mounting the liquid path Coriolis mass flowmeter is more than the cross section of the pipeline for mounting the liquid path endocone flowmeter. The invention also provides a measuring method which is adopted by the device. The oil, gas and water three-phase oil well continuous gauging device has the advantages of a simple structure, no movable parts in the measuring sensor, convenient, reliable and accurate signal acquisition, and easy realization.

Description

technical field [0001] The invention belongs to the technical field of fluid measurement, and in particular relates to a system and method for measuring the phase holdup of oil, gas and water three-phase fluid and the flow rate of each phase. Background technique [0002] Crude oil is a typical multiphase flow, including three-phase substances of oil, gas and water. The oil phase refers to the liquid hydrocarbon phase in the oil well output fluid, the gas phase refers to natural gas, light hydrocarbon, and non-light hydrocarbon gas, and the water phase refers to Mineralizes the water, along with a small amount of solid phase (sand, wax, hydrate). Oil, gas, and water multiphase flow not only have a variety of flow patterns, but also have complex and changeable components during the flow process, making flow detection difficult. However, in order to carry out oilfield development reasonably, it is necessary to know the output of a single oil well, including the oil production...

AI Technical Summary

Problems solved by technology

The problem with this method is whether the gas-liquid ratio of the three-phase fluid in the sampling part is consistent with the ratio in the original flow; whether the sampling ratio (constant) itself is affected by the flow pattern, flow fluctuation, etc.

After the liquid in the metering tank is stabilized, calculate the flow rate and holdup of each phase by measuring the differential pressure and liquid level. This method is an intermittent measurement method and has a certain impact on the continuous operation of the oil well.

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