APPARATUS AND METHOD FOR CHARACTERIZING A RESERVOIR

摘要

An apparatus and method for characterizing a subsurface formation is provide d. The apparatus includes a tool body, a probe assembly carried by the tool body fo r sealing off a region of the borehole wall, an actuator for moving the probe assembly betwe en a retracted position for conveyance of the tool body and a deployed position for sealing off a region of the borehole wall and a perforator extending through the probe assembly for penetrating a portion of the sealed-off region of the borehole wall. The tool may be provided with first and second drilling shafts with bits for penetrating various surfaces. The metho d involves sealing off a region of a wall of an open borehole penetrating the formation, creati ng a perforation through a portion of the sealed-off region of the borehole wall and testing the formation.