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Analysis of downhole OBM-contaminated formation fluid

  • US 6,274,865 B1
  • Filed: 02/23/1999
  • Issued: 08/14/2001
  • Est. Priority Date: 02/23/1999
  • Status: Expired due to Term
First Claim
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1. A method for determining OBM filtrate fraction of downhole fluid, using a borehole tool having a pump, a flowline, and an optical analyzer, the method comprising the steps of:

  • a) pumping downhole fluid through the analyzer;

    b) measuring OD of downhole fluid to produce a series of OD values at intervals of time; and

    c) calculating an OD asymptotic ratio indicative of OBM filtrate fraction.

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