Estimating Thickness-Independent Horizontal and Vertical Permeabilities With Packer/Probe Wireline Formation Testers

摘要

A spherical-flow cubic-analysis procedure has been developed for estimating horizontal and vertical permeabilities, k_(vh), and k_v, respectively, solely from pressure-transient data acquired at an observation probe of a dual-packer/ probe wireline formation tester (WFT) for any wellbore-inclination angle. The procedure is based on an analytical spherical-flow equation and a conventional spherical-flow-analysis graph of the observed drawdown or buildup pressures. The procedure does not require knowledge of the formation thickness, h, or observing the radial-flow regime at the probe.