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Methods for measuring a formation supercharge pressure

  • US 7,243,537 B2
  • Filed: 03/01/2005
  • Issued: 07/17/2007
  • Est. Priority Date: 03/01/2004
  • Status: Active Grant
First Claim
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1. A method of determining the supercharge pressure in a formation intersected by a borehole having a wall, the method comprising:

  • disposing a formation pressure test tool into the borehole, said formation pressure test tool comprising a probe for isolating a portion of the borehole;

    extending said probe into sealing contact with the borehole wall;

    performing at least one drawdown test with said formation pressure test tool by drawing formation fluid into a drawdown chamber of said formation pressure test tool and measuring fluid pressure in said drawdown chamber;

    modeling the supercharge pressure of the formation using transient pressure effects caused by the dynamic properties of a mudcake formed on the borehole wall; and

    determining the supercharge pressure of the formation using said supercharge pressure model.

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