Method of determining the extent of recovery of materials...

E - Fixed Constructions – 21 – B

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E21B 47/10 (2006.01) C09K 7/00 (2000.01)

Patent

CA 2448435

Disclosed is a method of determining the extent of recovery of materials injected into a oil well comprising the steps of : a) preparing a material to be injected into an oil well ; b) admixing therewith a chemical tracer compound at a predetermined concentration ; c) injecting the admixture into an oil well ; d) recovering from the oil well a production fluid ; e) analysing the production fluid for the concentration of the chemical tracer present in the production fluid ; and f) calculating the amount of admixture recovered from the oil well using the concentration of the chemical tracer present in the production fluid as a basis for the calculation. Fluorinated benzoic acids are disclosed as a preferred tracer.

Cette invention concerne un procédé permettant de déterminer l'ampleur de la récupération des matériaux injectée dans un puits de pétrole. Ce procédé consiste à : a) préparer le matériau destiné à être injecté dans un puits de pétrole; b) ajouter un composé de marquage chimique selon une concentration prédéterminée; c) injecter le mélange dans un puits de pétrole; d) récupérer hors du puits un fluide de production; e) analyser la concentration du marqueur chimique dans le fluide de production; et f) calculer le volume de mélange récupéré dans le puits de pétrole à partir de la concentration de marqueur chimique dans le fluide de production. Dans le cadre de cette invention, le marqueur préféré est constitué par des acides benzoïques fluorés.

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