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Formation tester tool assembly and methods of use

  • US 7,260,985 B2
  • Filed: 05/20/2005
  • Issued: 08/28/2007
  • Est. Priority Date: 05/21/2004
  • Status: Active Grant
First Claim
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1. A downhole apparatus comprising:

  • a drill collar having an outer surface for interaction with an earth formation;

    an extendable sample device having a bore and recessed beneath said outer surface in a first position to extend beyond said outer surface to a second position;

    a first draw down chamber slidably retaining a first draw down piston, said first draw down piston actuatable between a first position and a second position and said first draw down chamber in fluid communication with said extendable sample device;

    a flow line between said extendable sample device and said first draw down chamber, said bore and said flow line to receive at least formation fluid from the earth formation; and

    a second draw down chamber slidably retaining a second draw down piston, said second draw down chamber in fluid series with said first draw down chamber and said extendable sample device.

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