Device and method for metering oil-gas-water three-phase flow in thickened oil in whole range

Abstract

The invention provides a device for metering oil-gas-water three-phase flow in thickened oil in a whole range. The device comprises a Venturi flow meter 3, a double-energy gamma ray phase fraction instrument 2, a tank 5 and a differential pressure transmitter 6, wherein the double-energy gamma ray phase fraction instrument 2 is arranged on a vertical round tube at the upstream and the downstream of the Venturi flow meter or on a throat portion of a Venturi tube and comprises a double-energy gamma ray generator and a gamma ray detector, and due to the arrangement mode of the double-energy gamma ray generator and the gamma ray detector, gamma rays emitted by the double-energy gamma ray generator can penetrate through a tube cross section of the throat portion of the Venturi tube 3 in the radial direction and arrive at the gamma ray detector; the tank 5 is located at the downstream of the Venturi tube 3 and is used for accumulating or discharging the thickened oil, the top of the tank is provided with a gas outlet, and the bottom of the tank is provided with a liquid outlet; due to the arrangement mode of the differential pressure transmitter 6, the differential pressure transmitter 6 can measure differential pressure delta P between a lower pressure tapping and a liquid level caused by accumulation of the thickened oil in the tank 5. The invention further relates to a method for metering oil-gas-water three-phase flow in the thickened oil in the whole range.

Description

technical field [0001] The invention belongs to the field of heavy oil flow measurement. Background technique [0002] Among the world's oil and gas resources, heavy oil resources account for a considerable proportion. "Heavy oil" refers to crude oil with degassed crude oil viscosity greater than 100mPaS and relative density greater than 0.92 at the oil layer temperature, or heavy oil. According to statistics, the world's heavy oil reserves account for about 70% of the world's undeveloped crude oil reserves. The country with the richest reserves of heavy oil resources in the world is Canada, followed by Venezuela, the former Soviet Union, the Middle East, the United States, and China. With the exploitation of traditional crude oil and the increasing demand for energy in the world, heavy oil will surely occupy an increasingly important position in the future energy structure. Therefore, no matter from the point of view of the whole world's resources, or from the reality of...

AI Technical Summary

Problems solved by technology

However, when this method is applied to heavy oil, it is often encountered that the flow rate of heavy oil is lower than the lower limit of the measurement range of the Venturi flowmeter, or the heavy oil is in intermittent flow (that is, the flow rate is intermittent), which makes flow measurement impossible.

That is, the full-scale measurement of heavy oil flow cannot be realized

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