Patent ID: 7891417
Filing Date: 2011-02-22
Classification: E21B,G01V

Abstract:
1. In an open hole well traversing an earth formation, and improvement comprising: a) a tubular delivery means extending through the open hole well; b) an insulated sonde supported by said tubular delivery means; c) an array of at least partially insulated electrodes located and spaced on said insulated sonde and adapted to measure transient streaming potential voltage signals representative of transient pressure variations adjacent said at least partially insulated electrodes; and d) a processor means coupled to said array of said at least partially insulated electrodes, said processor means for generating an indication of a parameter of the earth formation utilizing indications of said transient streaming potential voltage signals, said indication of a parameter of the earth formation selected from the group including at least one indication of formation permeability and at least one indication of formation fracture.