Method of particle characterization based on fluorescence...

G - Physics – 01 – N

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G01N 15/10 (2006.01) G01N 15/14 (2006.01) G01N 21/64 (2006.01)

Patent

CA 2466102

The invention concerns a method for determining the particle size distribution (PSD) of bridging agents in fluids, particularly aqueous fluids used in hydrocarbon recovery such as drilling fluids, drill-in fluids, completion fluids, and the like. It was discovered that the PSD could be selectively determined for calcium carbonate as a bridging agent because it auto- fluoresces. The method is reproducible and is not bothered by the presence of other particles such as drill solids which interferes with conventional methods, for instance, light-scattering techniques. The light used to fluoresce the bridging agent may be filtered to a particular frequency if there are other components present that fluoresce. Flow cytometry is another technique that could be used to implement the invention.

L'invention concerne un procédé de détermination de la granulométrie (PSD) d'agents de pontage dans des fluides, en particulier de fluides aqueux utilisés dans la récupération d'hydrocarbures, tels que des boues de forage, des fluides de complétion, et similaires. On a mis en évidence que la granulométrie peut être déterminée de façon sélective pour le carbonate de calcium sous forme d'agent de pontage par son auto-fluorescence. Ledit procédé est reproductible sans être affecté par la présence d'autres particules telles que des solides de forage qui font obstacle aux procédés classiques, par exemple, des techniques de diffusion de la lumière. La lumière utilisée pour rendre fluorescent l'agent de pontage peut être filtrée à une fréquence particulière si d'autres composants présents deviennent fluorescents. La cytométrie de flux est une autre technique s'utilisant pour mettre en oeuvre l'objet de l'invention.

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