Retrieving a sample of formation fluid in a cased hole

E - Fixed Constructions – 21 – B

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E21B 49/10 (2006.01)

Patent

CA 2434659

Retrieving a sample of formation fluid from a formation layer traversed by a cased borehole comprising making a plurality of perforation sets through the casing wall into the formation layer, wherein the orientation of the perforation sets is so selected that the angle between adjacent perforation sets equals 360~ divided by the number of perforation sets; lowering a sampling tool into the borehole to the first perforation set; taking a sample from the formation and storing the sample in the first fluid sample container; positioning the sampling tool near the next perforation set, taking a sample from the formation and storing the sample in the next fluid sample container; and repeating the latter step until samples from all perforation sets have been taken, and retrieving the sampling tool.

Pour récupérer un échantillon de fluide formation provenant d'une couche de formation traversée par un trou de forage tubé, on effectue une pluralité de perforations dans la paroi du tubage pour atteindre la couche de formation, l'orientation des perforations étant sélectionnée de manière à ce que l'angle entre les perforations adjacentes soit égal à 360· divisé par le nombre des perforations; on fait descendre un outil d'échantillonnage dans le trou de forage jusqu'à la première perforation; on prélève un échantillon de la formation et on stocke l'échantillon dans le contenant destiné au premier échantillon de fluide; on positionne l'outil d'échantillonnage à proximité de la perforation suivante, on prélève un échantillon de la formation et on stocke l'échantillon dans le contenant destiné à l'échantillon de fluide suivant; et on recommence cette dernière étape jusqu'à ce qu'on ait prélevé des échantillons provenant de toutes les perforations, puis on récupère l'outil d'échantillonnage.

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