A method of determining the per stratum reserve quality of...

E - Fixed Constructions – 21 – B

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E21B 49/00 (2006.01)

Patent

CA 2487090

The present invention relates to a method of evaluating the hydraulic potential of a porous stratum defined between two depths z low and z high, the method consisting in generating periodic modulation in the rate of flow from the well, in lowering down the well and in activating for a few periods at the depth z low a measuring PLT sonde, in extracting from the resulting measurements the amplitude .DELTA.Q low of the sinusoidal component of the flow rate modulation relating to one of the imposed periods T, the amplitude .DELTA.P low of the sinusoidal component of the pressure modulation relating to the same period T, and the phase delay of the pressure sinewave relative to the flow rate sinewave .phi.low, in determining the response (see formula I) in raising the sonde to depth z high, and in determining the complex response (see formula II) in calculating the complex response (see formula III) in postulating a physical model for the stratum by numerically inverting the mathematical formula giving the theoretical complex response, in determining the hydraulic characteristics of the stratum defined by the measured response R stratum, in calculating the well productivity index IP stratum relating to the stratum in question, and in deducing therefrom the mean deposit pressure P D in the stratum using the formula: (see formula IV)

La présente invention concerne un procédé d'évaluation du potentiel hydraulique d'une strate poreuse délimitée par deux cotes z¿bas? et z¿haut ?consistant à générer une modulation périodique du débit du puits; à descendre dans le puits et l'activer durant quelques périodes à la profondeur z¿bas? une sonde PLT de mesure, à extraire; des mesures obtenues l'amplitude .DELTA.Q¿b?,~ de la composante sinusoïdale de la modulation du débit relative à l'une T des périodes imposées, l'amplitude .DELTA.P¿bas? de la composante sinusoïdale de la modulation de la pression relative â la même période T, et le retard de phase de l'onde sinusoïdale de la pression par rapport à celle du débit (pbas, à déterminer la réponse R¿bas? = bas e-?i?¿,? ¿à .DELTA.Q¿bas? remonter la sonde jusqu'à la cote z¿haut? et déterminer la réponse complexe ?R¿haut = ?haut¿ e-?i?¿, à calculer la réponse complexe Rstrate = Rhaut Rbas ¿y ?~Q¿haut? ?R¿bas - R¿haut? à postuler un modèle physique pour la strate par inversion numérique de la formule mathématique donnant la réponse complexe théorique, déterminer lescaractéristiques hydrauliques de la strate définie par la réponse mesurée Rstrare , à calculer l'indice de productivité du puits IPstrate relatif à la strate considérée et en déduire la pression de gisement moyenne PG dans la strate selon la formule P¿G? =P¿F? + Q pte.

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