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Method and apparatus for balanced pressure sampling

  • US 7,913,554 B2
  • Filed: 06/16/2009
  • Issued: 03/29/2011
  • Est. Priority Date: 11/17/2004
  • Status: Active Grant
First Claim
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1. A method of sampling fluid from a formation penetrated by a borehole, comprising:

  • positioning a downhole tool having a flow line in the borehole;

    establishing an inlet port through which fluid passes from a first point in the formation into the flow line;

    establishing an outlet port through which fluid passes from the flow line into a second point in the formation;

    passing fluid between the formation and the flow line through the inlet and outlet ports to create a flow circuit between the inlet port and the outlet port; and

    performing an in-situ flow test of the formation using the created flow circuit;

    wherein an invaded zone in the formation acts as a barrier to fluid flow into the borehole along the flow circuit.

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