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Formation Evaluation While Drilling

  • US 20080087470A1
  • Filed: 11/20/2007
  • Published: 04/17/2008
  • Est. Priority Date: 12/19/2005
  • Status: Abandoned Application
First Claim
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1. A sample module for a sampling while drilling tool positionable in a wellbore penetrating a subterranean formation, comprising:

  • a sample chamber having an inlet;

    a sample fluid flowline operatively connectable to the sample chamber inlet for passing a downhole fluid thereto;

    a primary piston slidably disposed within the sample chamber and dividing the sample chamber into a sample volume and a buffer volume, the primary piston having a first face in fluid communication with the sample volume and a second face in fluid communication with the buffer volume;

    a secondary piston having a first face in fluid communication with the buffer volume and a second face; and

    a buffer fluid disposed in the buffer volume.

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