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Surface gas correction by group contribution equilibrium model

  • US 10,641,757 B2
  • Filed: 03/26/2014
  • Issued: 05/05/2020
  • Est. Priority Date: 03/27/2013
  • Status: Active Grant
First Claim
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1. A method for characterizing formation fluid, comprising:

  • extracting a gas sample from a fluid exposed to a formation during downhole operations;

    predetermining a chemical composition of a virgin fluid prior to exposing the virgin fluid to the formation;

    exposing the virgin fluid to the formation;

    measuring a temperature of the gas sample;

    determining from the gas sample a vapor-phase molar contribution of each of one or more components of interest in the fluid exposed to the formation;

    determining a partial vapor pressure for each component of interest using the temperature;

    determining a liquid-phase molar contribution of each component of interest using the determined partial vapor pressure and the determined vapor-phase molar contribution and a vapor-liquid group contribution equilibrium equation of state; and

    subtracting the predetermined chemical composition of the virgin fluid from a sum of the determined vapor-phase and liquid-phase molar contributions of all the components of the fluid exposed to the formation to characterize the formation fluid.

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