Fast recognition method for gas-liquid two-phase flow mass flow pattern based on along-the-way signal coupling

Abstract

The invention discloses a fast recognition method for a gas-liquid two-phase flow mass flow pattern based on along-the-way signal coupling.The fast recognition method is characterized by including the steps that 1, pressure difference signals of pressure difference measuring devices at different positions, along the way, of a gathering and transportation vertical pipe system are collected, and real-time filtering is conducted in the collecting process, wherein the number of the pressure difference measuring devices installed on a vertical pipe section is equal to or larger than two, and the number of the pressure difference measuring devices between the top of a vertical pipe and a gas-liquid separator is equal to or larger than one; 2, the filtered pressure difference signals are nondimensionalized to obtain a non-dimensional sample; 3, non-dimensional characteristics of all the pressure difference signals of the non-dimensional sample are calculated; 4, the non-dimensional characteristics are input into a preset judgment model to obtain a flow pattern type.The mass flow pattern is fast recognized based on the fast indication action on the flow pattern type by the coupling relation of the along-the-way signals, within short time, of the gathering and transportation vertical pipe system.

Description

technical field [0001] The invention belongs to the technical field of multiphase flow detection in petroleum engineering, and in particular relates to a rapid identification method for the overall flow pattern of gas-liquid two-phase flow based on along-process signal coupling. Background technique [0002] In offshore oil and gas development, in order to save pipeline laying costs, gas-liquid gathering and transportation (mixed transportation) is often used to lift crude oil, natural gas and water from the seabed to the production platform on the sea surface. Among them, the pipe section from the seabed to the sea surface is called the riser. Since a platform usually collects the output of multiple oil wells, there is a certain length of pipe section laid along the bottom of the riser from the bottom of the riser to the wellhead. The special structure of submarine pipe-standpipe makes the flow pattern of the gas-liquid mixture in the riser pipe different from the flow pat...

AI Technical Summary

Problems solved by technology

However, in the existing identification methods, what adopts is "one-to-one" mode (Chinese invention patent CN100573100C, Chinese invention patent application CN104807589A) or "one-to-many" mode (Chinese invention patent CN100507509C), because the support vector machine is a A binary classification mechanism, the number of support vector machines required for the above mode is large, and each time the discrimination is made, all the support vector machines have to work once, and the discrimination process is complicated

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