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Mud cake probe extension apparatus and method

  • US 8,499,831 B2
  • Filed: 01/19/2010
  • Issued: 08/06/2013
  • Est. Priority Date: 01/23/2009
  • Status: Active Grant
First Claim
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1. An apparatus, comprising:

  • a downhole tool configured for conveyance within a wellbore extending into a subterranean formation, the downhole tool comprising;

    a probe assembly comprising an inlet having one or more filter openings, a packer comprising an elastomeric material surrounding the inlet, and a filter piston actuatable between an extended position and a retracted position and having an external end, wherein;

    in the extended position, the external end protrudes past the inlet to form an opening in the subterranean formation and substantially close the filter openings in the inlet; and

    in the retracted position, the filter piston is retracted within the inlet to expose the filter openings to the subterranean formation through the opening.

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