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Method and apparatus for ultrasound velocity measurements in drilling fluids

  • US 20060101916A1
  • Filed: 11/21/2003
  • Published: 05/18/2006
  • Est. Priority Date: 12/31/2002
  • Status: Active Grant
First Claim
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1. - A method for determining a velocity of ultrasound propagation in a drilling fluid in a downhole environment, comprising:

  • disposing a first ultrasound transducer (37) adjacent to a second ultrasound transducer (39) such that the front face (37f) of the first transducer (37) is offset from the front face (39f) of the second ultrasound transducer (39) by a predetermined radial offset distance (Δ

    Df). emitting an ultrasound pulse into the drilling fluid in a borehole using the first ultrasound transducer (37);

    detecting the ultrasound pulse after the ultrasound pulse has travelled through the drilling fluid a distance (d); and

    determining the velocity of ultrasound propagation from the distance (d) and the travel time (t).

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