Multizone production monitoring system

E - Fixed Constructions – 21 – B

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E21B 47/06 (2006.01) E21B 23/03 (2006.01) E21B 47/10 (2006.01)

Patent

CA 2286758

In a multiple connected well, spaced apart production packers (26a-D) isolate independent zones (15-18) from one another. In each isolated production zone, a side pocket mandrel (30) with a full opening bore (40A) has lengthwise extending side by side pockets (40B, 40C, 40D) for receiving a static pressure measurement instrument or tool (90); for providing an elongated pressure differential flow passageway; and for receiving a differential pressure measuring tool (74). Fluid flow in the production zone is channelled through the flow passageway to the full opening bore (40A) and the fluid is communicated to the static pressure measuring tool (90) and to the differential pressure tool (74). The static pressure and differential pressure of the fluid flow from each production zone is independently measured at the time of production and sequentially and repetitively read out at the earth's surface. From the pressure measurements and flow equations, the production flow is determined.

Dans le cas d'un puits à connexions multiples, des garnitures d'étanchéité de production (26A-D) viennent isoler les unes des autres des zones indépendantes (15-18). Dans chaque zone ainsi isolée, un mandrin à poche latérale (30) pourvu d'un alésage totalement ouvert (40A) est muni de poches disposées côte à côte (40B, 40C, 40D) accueillant un instrument ou un outil de mesure de pression statique, formant un passage allongé pour le flux de pression différentielle, et accueillant un outil de mesure de la pression différentielle (74). Le flux de fluide dans la zone de production est canalisé dans le passage d'écoulement vers l'alésage totalement ouvert (40A), le fluide étant en communication avec l'outil de mesure de pression statique (90) et l'outil de mesure de pression différentielle (74). La pression statique et la pression différentielle du flux de fluide provenant de chaque zone de production sont mesurées indépendamment lors de la production, puis de façon séquentielle, et enfin affichées de façon répétitive à la surface. L'évaluation du flux de production se fait à partir d'équations de mesures de pression et d'écoulement.

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