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Method for in-situ analysis of formation parameters

  • US 6,672,386 B2
  • Filed: 06/06/2002
  • Issued: 01/06/2004
  • Est. Priority Date: 06/06/2002
  • Status: Expired due to Fees
First Claim
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1. A method of determining at least one formation parameter of interest, comprising;

  • a. sampling fluid from a formation using a tool having a sample chamber and a fluid sampling device;

    b. determining time dependent pressure in a corresponding time dependent tool volume;

    c. determining a corresponding draw rate of the formation fluid as a function of time; and

    d. using a sum of said tool volume pressure, a sum of a time derivative of said tool volume pressure, and a sum of said draw rate as input data for a regression analysis wherein, the output of the regression analysis represents the at least one formation parameter of interest.

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