×

PETROLEUM-FLUID PROPERTY PREDICTION FROM GAS CHROMATOGRAPHIC ANALYSIS OF ROCK EXTRACTS OR FLUID SAMPLES

  • US 20140208825A1
  • Filed: 08/02/2013
  • Published: 07/31/2014
  • Est. Priority Date: 08/03/2012
  • Status: Active Grant
First Claim
Patent Images

1. A method of analyzing reservoir fluid property comprising:

  • a) obtaining a rock extract or fluid sample from a subterranean reservoir;

    b) analyzing the rock extract or fluid sample by gas chromatography to provide a gas chromatogram;

    c) calculating chromatographic peak area for three or more alkanes in the gas chromatogram;

    d) selecting a representative series of three or more alkane peaks for analysis;

    e) optionally, normalizing the alkane peak areas across the representative series;

    f) optionally, converting the chromatographic peak areas of the selected series to mole percent or weight percent;

    g) obtaining a plot of the concentration in terms of peak area, mole percent or weight percent, against carbon number or molecular weight;

    h) fitting an equation to plotted concentrations obtained from (g);

    i) determining goodness of fit (R2) for the equation to the plotted peaks;

    j) re-selecting the representative series of alkane peaks and repeating (e), (f), (g), (h), (i) and (j) as needed to obtain suitable goodness of fit;

    k) identifying calibration petroleum sample or samples with similar plot; and

    l) assigning one or more fluid properties from the calibration petroleum sample or samples to the rock extract or fluid sample with unknown property.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×