Improved method and system for measuring multiphase flow...

G - Physics – 01 – F

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G01F 1/74 (2006.01) G01F 1/44 (2006.01) G01F 15/08 (2006.01)

Patent

CA 2399536

An improved method and system for measuring a multi-phase flow in a pressure flow meter. An extended venturi (114) is used and pressure of the multi-phase flow is measured at three or more positions in the venturi, which define two or more pressure differentials in the flow conduit. The differential pressures are then used to calculate the mass flow of the gas phases, the total mass flow, and the liquid phase. The method for determining the mass flow of the high void fraction fluid flow and the gas flow includes certain steps. The first step is calculating a gas density for the gas flow (210). The next two steps are finding a normalized gas mass flow rate through the venturi and computing a gas mass flow rate (220). The following step is estimating the gas velocity in the venturi tube throat (230). The next step is calculating the pressure drop experienced by the gas phase due to work performed by the gas phase in accelerating the liquid phase between the upstream pressure measuring point (142) and the pressure measuring point in the venturi throat (240, 250).

Cette invention concerne une technique et un systèmes améliorés permettant de mesurer un débit multi-phase dans un débitmètre à pression. Dans un venturi à étranglement prolongé (114), on mesure la pression d'un débit multi-phase en au moins deux points, ce qui définit des différentiels de pression dans le conduit d'écoulement. Ces pressions différentielles servent à calculer le débit massique de la phase gazeuse, le débit massique total, et la phase liquide. La technique utilisée pour déterminer le débit massique du fluide à fraction de vide élevée et du débit gazeux comprend différentes étapes. La première étape consiste à calculer la densité du gaz du débit gazeux (210). Les deux étapes suivantes consistent à déterminer un débit massique gazeux normalisé au niveau du venturi et à calculer un débit massique gazeux (220). On estime ensuite la vitesse du gaz dans l'étranglement du tube de venturi (230). Enfin, on calcule la chute de pression survenue dans la phase gazeuse par suite du travail fournie par ladite phase gazeuse en termes d'accélération de la phase liquide entre le point de mesure de la pression en amont (142) et le point de mesure de la pression dans l'étranglement du venturi (240, 250).

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