In-situ permeability determining method
 A method of determining the permeability of a particular stratum in an earth formation traversed by a borehole includes injecting a liquid into the borehole at a first pressure thereby causing liquid flow into the stratum. A first flow rate of the liquid is determined at the first pressure. The pressure of the liquid being injected into the borehole is then changed to a second pressure level and a second flow rate of the liquid flowing into the stratum is determined at the second pressure. An indication of the permeability of the stratum is then derived in accordance with the two pressures, the two flow rates and known characteristics of the stratum. 
Texaco Inc.
E E
E21B E21B
inventional inventional
Wayne F. Donald J. Dan M. Albert P.
Warren Dowling Arnold Richter, Jr.