| 摘要 |
<p>The invention concerns a method for evaluating the hydraulic head of a porous stratum delimited by two sides zlow and zhigh which consists in generating a periodic modulation of the flow rate of the well, in lowering into the well and activating for some periods at the depth zlow a measuring production logging tool probe, extracting, from the measurements obtained the amplitude ΔQlow of the sinusoidal component of the flow rate modulation related to one of the imposed periods T, the amplitude of ΔPlow of sinusoidal component of the pressure modulation related to the same period T, and the phase delay of the pressure sinusoidal wave relative to that of the flow rate Φlow, determining the response Rlow = ΔPlow/ΔQlow e-iΦlow, raising the probe up to the elevation zhigh, and determining the complex response Rhigh = ΔPhigh/ΔQhigh e-iΦhigh, calculating the complex response Rstratum = Rhigh°Rlow/Rlow Rhigh, in assuming a physical model for the strata by numerical inversion of the mathematical formula providing the theoretical complex response, determining the hydraulic characteristics of the stratum defined by the measured response Rstratum, calculating the productivity index of the well IPstratum related to the stratum concerned and deducing the average reservoir pressure PG in the stratum based on the formula PG = PF + Qstratum/IP.</p> |
