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Apparatus and method for detecting the presence of gas in a borehole flow stream

  • US 5,167,149 A
  • Filed: 08/28/1990
  • Issued: 12/01/1992
  • Est. Priority Date: 08/28/1990
  • Status: Expired due to Term
First Claim
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1. A method for analyzing in a borehole apparatus the volume of gas in a multiphase fluid obtained from a formation, comprising:

  • containing the fluid within the borehole,directing light towards the contained fluid;

    reflecting light away from the fluid with an interface of the fluid at an angle of incidence within a range that extends from less than a Brewster angle to more than a critical angle of gas;

    detecting the light reflected from the interface;

    obtaining data related to the angle of incidence of the reflected light; and

    categorizing the gas volume present in the multiphase fluid obtained from the formation according to the data related to the angle of incidence of the reflected light using the Brewster angle of gas and the critical angle of gas.

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