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Apparatus and method for characterizing a reservoir

  • US 7,703,526 B2
  • Filed: 02/08/2008
  • Issued: 04/27/2010
  • Est. Priority Date: 06/30/2004
  • Status: Active Grant
First Claim
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1. An apparatus for perforating a cased borehole penetrating a subsurface formation, comprising:

  • a tool body adapted for conveyance within the cased borehole;

    a first drilling shaft having a first drill bit connected to an end thereof for perforating a portion of the casing lining the borehole wall;

    a second drilling shaft having a second drill bit connected to an end thereof for extending through the perforation in the casing and perforating a portion of the borehole wall;

    a drilling motor assembly for applying torque and translatory force to the first and second drilling shafts; and

    a coupling assembly for selectively coupling the drilling motor assembly to one of the first drilling shaft, the second drilling shaft, and combinations thereof, wherein the coupling coupling assembly comprises a gear assembly operatively connected to both the first and second drilling shafts.

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