A gas-liquid multiphase metering device

Abstract

A gas-liquid multi-phase metering device comprises a measuring probe and is characterized in that a small-volume component measuring cavity is arranged in a large-volume volume measuring cavity used to measure volume, the measuring probe is disposed in the component measuring cavity, and a body of the component measuring cavity is controlled to communicate with a body of the volume measuring cavity or to self-close through a moving mechanism; the gas-liquid multi-phase metering device can effectively measure a component ratio of a medium and can also meter both a liquid and a gas.

Description

technical field [0001] The invention belongs to a metering device, in particular to a gas-liquid multiphase metering device. Background technique [0002] At present, there are more accurate products on the market for measuring the liquid volume at the wellhead of the oil field, which use the weighing principle, but the structure is complex and costly, and it can only measure the total liquid volume, so its use is very limited; the principle of tipping bucket counting can theoretically measure accurately Liquid volume, but with the fouling in the metering bucket, the volume in the bucket and the balance point of the flip will change, causing huge errors. Since the metering bucket is a movable and irregular part, automatic erasure is difficult to achieve. Therefore, although the tipping bucket metering device is used in oil fields It has existed for decades, but it has not been able to be promoted and used in batches. [0003] The oil-gas-water three-phase metering device si...

AI Technical Summary

Problems solved by technology

[0004] 1. The conventional water content meter is very sensitive to the gas contained in the liquid phase, and a small gas content will bring a large measurement error of the water content;

[0005] 2. The physical properties of the oil-gas-water mixture buried underground for thousands of years and tens of thousands of years are very complex. If the gas-liquid separation is good and the oil-water separation is preliminary, the residence time must be prolonged, which directly leads to the increase in the volume of the separator. If the volume is large Production and installation and maintenance costs will increase;

[0006] 3. Heating can assist gas-liquid separation and liquid-phase oil-water and impurity separation to improve measurement accuracy, but heating a large volume of medium consumes a lot of energy, and the power is too large to distribute power on site;

[0007] 4. Since the conventional online water content meter is a real-time measurement, in addition to being disturbed by gas, the emulsification state of the oil-water mixture and the impurities contained will have unpredictable effects on the measurement results, and the accuracy cannot be guaranteed. fully demonstrates this;

[0008] 5. As long as the three-phase metering devices with a certain accuracy can be guaranteed on the market, they are all bulky and costly, which limits their application in oilfield wellheads

Wellhead digitalization is an important basis for digital oilfields, but due to the large number of oil wells, it is determined that the three-phase metering device must have low purchase cost, low installation and maintenance cost, otherwise it is difficult to popularize and use

[0009] To sum up, at present, in order to complete single well production measurement, liquid and gas volume metering devices must be matched with water cut meters, and the existing liquid and gas volume metering devices have the defects of large volume and high cost, which are greatly restricted in actual promotion

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