Small shunt multiphase flowmeter and its adjustment method

Abstract

The present invention provides a small split-type multi-phase flowmeter and its adjustment method, wherein the small split-type multi-phase flowmeter includes: a vertically arranged and used to split the measured gas-liquid two-phase fluid into a flow from the upward direction A branch pipe for a fluid and a second fluid flowing downward, a first branch connected to the upper outlet of the branch pipe for the passage of the first fluid, and a second branch connected to the lower outlet of the branch pipe for the passage of the second fluid The first flow regulating valve and the first flow meter are connected in series on the first branch, the second flow regulating valve and the second flow meter are connected in series on the second branch, and the flow computer passes through the first fluid and the second fluid In the case of forming a single-phase fluid, obtain the gas flow ratio reference value and the liquid flow ratio reference value respectively measured by the first flowmeter and the second flowmeter, and compare them with the gas and liquid flow measurement values ​​under the multiphase flow measurement state Compare and determine the error of gas flow and liquid flow; realize self-adjustment adjustment.

Description

technical field [0001] The invention designs fluid flow measurement, and in particular relates to a small shunt type multiphase flowmeter and its adjustment method. Background technique [0002] Multiphase fluid is a common flow condition in petroleum, chemical industry, pipeline transportation and other fields. At present, in the fields of oil and gas, shale gas, and chemical industry, online non-separated multiphase flow measurement devices are developing rapidly, and various measurement principles and structures emerge in endlessly. [0003] For gas-liquid mixed fluid with high or low gas-liquid ratio, large mixed flow rate, and small liquid phase, it is very difficult for a multiphase flowmeter to accurately measure the gas-liquid two-phase flow; and for gas-liquid mixed fluid with a small gas phase, the flow rate The mixing effect is poor, the fluctuation is large, and the multiphase flow measurement error is large; the existing multiphase flowmeter generally has a sma...

AI Technical Summary

Problems solved by technology

Due to the complexity and variability of multiphase fluids, users always doubt the authenticity and reliability of its measurement. The phase flowmeter was the first to be suspected of having a problem, and it was impossible to judge whether the multiphase flowmeter was out of tolerance on site. The only way was to use traditional large-scale separate metering equipment for calibration. The separate metering equipment is bulky and requires a lot of installation and connection work. , especially for high-pressure and high-flow oil and gas wells, the connecting pipes require large hoisting equipment, which takes a long time to assemble

In addition, the multiphase flowmeter itself needs to be adjusted regularly, and the adjustment cost is very high. It takes nearly 10,000 yuan to measure and adjust a medium-high pressure oil and gas well in China, and it costs even It costs tens of thousands of dollars, which is a world problem that has plagued multiphase flow measurement for a long time

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