Shell Oil Comapny

Yves Veran

Douwe Johannes Runia

Ulfert Cornelis Klomp

Floor Andre Hartog

Jean Eric Negre

A tracer release method for monitoring fluid flow in a well utilizes a deformable container having a liquid tracer material which container has an outlet which debouches into the neck portion of a venturi in a well conduit. The container has a wall which is at least partly exposed to the fluid pressure at the relatively wide in- or outlet of the venturi, so that an amount of tracer is injected continuously or discontinuously into the well effluents which is proportional to the pressure difference p across the venturi, which pressure difference p is indicative of the fluid density &rgr; and squared fluid velocity &ugr;.

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Rijswijk, Netherlands

Yves Veran