Tool and method for evaluating fluid dynamic properties of a...

E - Fixed Constructions – 21 – B

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E21B 47/06 (2006.01) E21B 44/04 (2006.01) E21B 47/04 (2006.01)

Patent

CA 2681156

The permeability of the cement annulus surrounding a casing is measured by locating a tool inside the casing, placing a probe of the tool in contact with the cement annulus, measuring the change of pressure in the probe over time, where the change in pressure over time is a function of among other things, the initial probe pressure, the formation pressure, and the permeability, and using the measured change over time to determine an estimated permeability. The estimated permeability is useful in determining whether carbon dioxide can be effectively sequestered in the formation below or at the depth of measurement without significant leakage through the cement annulus.

Selon l'invention, la perméabilité d'un anneau de ciment entourant un coffrage est mesurée par placement d'un outil à l'intérieur du coffrage, par placement d'une sonde de l'outil en contact avec l'anneau de ciment, par mesure du changement de pression dans la sonde au cours du temps, le changement de pression au cours du temps étant une fonction, entre autres, de la pression de sonde initiale, de la pression et de la perméabilité de la formation, et par utilisation du changement au cours du temps mesuré pour déterminer une perméabilité estimée. La perméabilité estimée est utile pour déterminer si du dioxyde de carbone peut être efficacement séquestré dans la formation au-dessous ou à la profondeur de mesure sans fuite significative à travers l'anneau en ciment.

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