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Asphaltene content of heavy oil

  • US 10,012,074 B2
  • Filed: 01/11/2013
  • Issued: 07/03/2018
  • Est. Priority Date: 01/12/2012
  • Status: Active Grant
First Claim
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1. A method, comprising:

  • conveying a downhole tool within a borehole extending into a subterranean formation, wherein the subterranean formation comprises a fluid of varying viscosity;

    drawing fluid from the subterranean formation into the downhole tool;

    measuring fluorescence intensity of the drawn fluid via a sensor of the downhole tool; and

    estimating asphaltene content of the drawn fluid based on the measured fluorescence intensity utilizing a relationship between fluorescence intensity and asphaltene content given by;

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