Methods for analysis of pressure response in underground...

E - Fixed Constructions – 21 – B

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E21B 47/06 (2006.01)

Patent

CA 2606592

A method of analysing a reservoir pressure in an underground formation surrounding a well, comprising: determining the permeability of mud cake on the wall of the well in the region in which the pressure measurement is made; determining the thickness of mud cake on the well of the well in the region in which the pressure measurement is made; determining the hydrostatic pressure in the well in the region in which the pressure measurement is made; measuring the formation pressure at the wall of the well; calculating a pressure decay index from the mud cake permeability and thickness, the hydrostatic pressure and the measured pressure; and using the pressure decay index to analyse the measured pressure to derive the reservoir pressure.

L'invention concerne une méthode d'analyse de la pression de réservoir dans une formation souterraine entourant un puits. La méthode consiste à: déterminer la perméabilité d'un gâteau de boue présent sur la paroi du puits, dans la zone de réalisation de la mesure de pression; déterminer l'épaisseur du gâteau de boue sur la paroi du puits, dans la zone de réalisation de la mesure de pression; déterminer la pression hydrostatique dans le puits, dans la zone de réalisation de la mesure de pression; mesurer la pression de formation au niveau de la paroi du puits; calculer un coefficient de décroissance de la pression à partir de la perméabilité et de l'épaisseur du gâteau de boue, de la pression hydrostatique et de la pression mesurée; et exploiter le coefficient de décroissance de la pression pour analyser la pression mesurée et en déduire la pression de réservoir.

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