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Assessing downhole WBM-contaminated connate water

  • US 20040000400A1
  • Filed: 12/13/2002
  • Published: 01/01/2004
  • Est. Priority Date: 11/28/2001
  • Status: Active Grant
First Claim
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1. A method for assessing water-based mud filtrate concentration in a downhole fluid sample drawn from the borehole of an oil well, comprising:

  • a) pumping a water-based mud having a water-soluble fluorescent dye tracer into the borehole;

    b) pumping sample fluid from a selected downhole location through a downhole flow line;

    c) illuminating sample fluid in an excitation region of the downhole flow line with fluorescence excitation light; and

    d) measuring fluorescence emission from the excitation region to produce a measured value representing the fraction of water-based mud filtrate in the sample fluid.

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