An online identification method of gas-liquid two-phase flow pattern in gathering-riser system

Abstract

The invention discloses an online identification method for a gas-liquid two-phase-flow flow pattern in a gathering and transportation-vertical pipe system. The online identification method is used for pre-processing a vertical pipe top pressure signal to be identified of the gathering and transportation-vertical pipe system; a characteristic parameter vector comprising three main components is extracted through statistical parameter calculation and man component analysis; then the characteristic parameter vector is input into a multi-class classifier of a pre-trained least squares support vector machine, so that the attribution of the vertical pipe top pressure signal in four basic classes including a first type of serious section plug flow, a second type of serious section plug flow, a flow pattern for transiting to the serious section plug flows, and a mixed type flow pattern of vibration type serious section plug flow and stable flowing; when the attribution belongs to the mixed type flow pattern of the vibration type serious section plug flow and the stable flowing, characteristic parameters in two frequency regions of the signal to be processed are input into two types of trained classifiers to determine the final attribution. The online identification method has high identification rate, strong portability and good field adaptability, and can effectively meet the online identification requirements.

Description

【Technical field】 [0001] The invention belongs to the technical field of petroleum engineering multiphase flow detection, and relates to a method for identifying flow patterns of gas-liquid two-phase flow. 【Background technique】 [0002] In the offshore oil industry, the flow pattern of oil and gas two-phase flow is very important to the safe operation of the oil field. Gathering-riser systems are often used in industry to transport oil and gas resources from oil wells to processing platforms. During the transmission process, the oil-gas multiphase mixture in the gathering-riser system often presents various flow patterns, and some flow patterns can cause equipment damage or production reduction. Therefore, the flow pattern in the oil and gas pipeline must be strictly controlled to ensure the safety of production. [0003] Analyzing and discriminating the gas-liquid two-phase flow pattern in the gathering-riser system is the first step in effective control. The usual metho...

AI Technical Summary

Problems solved by technology

Pressure differential measurement technology has irreplaceable advantages in the flow pattern recognition method due to its simple installation and better industrialization. However, since a large number of pressure differential sensors may be installed on the pipeline, there is a problem of pressure differential signal selection, that is, to select Is it closely related to the flow pattern or choose the contradiction of easy installation

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