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Methods for downhole sampling of tight formations

  • US 8,397,817 B2
  • Filed: 08/18/2010
  • Issued: 03/19/2013
  • Est. Priority Date: 08/18/2010
  • Status: Active Grant
First Claim
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1. A method of sampling a subterranean formation, comprising the steps ofsuspending a tool with side bore drilling, fluid storage and pumping capability from the surface to a desired location in a well;

  • creating a side bore into the wall of a well traversing said formation;

    sealing said wall around the side bore to provide a pressure seal between said side bore and said well;

    pressurizing the side bore beyond a pressure inducing formation fracture while maintaining said seal;

    pumping a fracturing fluid adapted to prevent a complete closure of said fracture from a reservoir inside said tool through said side bore into said fracture; and

    reversing the pumping to sample formation fluid through said fracture and said side bore.

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