Automated Diluter For Calibration Of A Gas Chromatograph In Oilfield Applications

Patent metadata

Field	Value
Publication number	US-2025102478-A1
Application number	US-202318373759-A
Country	US
Kind code	A1
Filing date	Sep 27, 2023
Priority date	Sep 27, 2023
Publication date	Mar 27, 2025
Grant date	—

Abstract

A variety of methods and systems are disclosed, including, in one example, a method that includes extracting one or more dissolved gases from one or more fluid samples to form one or more extracted gases. The method also includes configuring a dilution rate with an information handling system, automatically diluting the one or more extracted gases with diluent at the dilution rate to form one or more diluted extracted gases and adding the one or more diluted extracted gases to a carrier gas to form sample gas. The method also includes separating one or more components of the sample gas with one or more gas chromatographs, measuring one or more analytes of the sample gas with one or more detectors, and calibrating the one or more gas chromatographs based at least in part on the measuring of the one or more analytes.

First claim

What is claimed is:

1 . A method comprising:
extracting one or more dissolved gases from one or more fluid samples to form one or more extracted gases; configuring a dilution rate with an information handling system; automatically diluting the one or more extracted gases with diluent at the dilution rate to form one or more diluted extracted gases; adding the one or more diluted extracted gases to a carrier gas to form sample gas; separating one or more components of the sample gas with one or more gas chromatographs; measuring one or more analytes of the sample gas with one or more detectors; and calibrating the one or more gas chromatographs based at least in part on the measuring of the one or more analytes.

2 . The method of claim 1 , wherein configuring the dilution rate is based at least in part on an instrument cycle time of at least one of the one or more gas chromatographs.

3 . The method of claim 1 , wherein configuring the dilution rate is based at least in part on a linearity or non-linearity of a calibration curve being rendered by the information handling system.

4 . The method of claim 1 , wherein configuring the dilution rate with the information handling system is based on one or more user interactions with a user interface, wherein the one or more user interactions indicate at least a target measurement density.

5 . The method of claim 1 , further comprising modifying in real-time the dilution rate with the information handling system.

6 . The method of claim 5 , wherein the modifying is based at least in part on a comparison between a measured and a target measurement density.

7 . The method of claim 1 , wherein automatically diluting the one or more extracted gases comprises increasing or decreasing concentration of one or more analytes of the one or more extracted gases to form the one or more diluted extracted gases.

8 . The method of claim 1 , wherein the diluent comprises N 2 and pentane.

9 . The method of claim 1 , wherein the automatic diluting of the one or more extracted gases at dilution rate comprises flowing diluent from a diluent source at a flow rate set by a flow control device, wherein the flow control device is communicatively coupled to the information handling system.

10 . The method of claim 1 , further comprising sampling a drilling fluid during a drilling operation.

11 . A method comprising:
extracting one or more dissolved gases from one or more fluid samples to form one or more extracted gases; configuring dilution rate with an information handling system; adding the one or more extracted gases to a carrier gas to form one or more mixtures comprising the one or more extracted gases and the carrier gas; automatically diluting the one or more mixtures with diluent at the dilution rate to form sample gas; separating one or more components of the sample gas with a gas chromatograph; measuring one or more analytes of the sample gas with one or more detectors of the gas chromatograph; and calibrating the one or more gas chromatographs based at least in part on the measuring of the one or more analytes.

12 . The method of claim 11 , wherein calibrating the one or more gas chromatographs comprises rendering one or more calibration curves across a range of at least two decades of concentration of at least one of the one or more analytes.

13 . A system comprising:
a fluid sample sources comprising one or more fluid samples; a gas extractor operable to extract one or more gases from the one or more fluid samples; a gas chromatograph, wherein the gas chromatograph is
in fluidic communication with the gas extractor, a carrier gas source, and a diluent source, and
communicatively coupled to an information handling system; and
one or more flow controllers operable to adjust flow of diluent at a dilution rate, wherein the information handling system is communicatively coupled to the one or more flow controllers and operable to configure the dilution rate.

14 . The system of claim 13 , wherein configuring the dilution rate is performed in real-time by the information handling system.

15 . The system of claim 14 , wherein configuring the dilution rate is based at least in part on a comparison between a target measurement density and an actual measurement density.

16 . The system of claim 13 , wherein the configuring the dilution rate is based on an instrument cycle time of at least the gas chromatograph.

17 . The system of claim 13 , further comprising a user interface, wherein the configuring of the dilution rate is based at least in part on a user interaction with the user interface.

18 . The system of claim 13 , wherein the flow of diluent decreases concentration of at least one analyte of interest of the one or more gases.

19 . The system of claim 13 , wherein the flow of diluent increases concentration of at least one analyte of interest of the one or more gases.

20 . The system of claim 13 , wherein the flow of diluent varies concentration of at least one analyte of interest across a range of at least two decades.

Assignees

• Halliburton Energy Services Inc

Inventors

• Rowe Mathew Dennis

Classifications

• G01N2030/025

  Gas chromatography · CPC title

• G01N30/88

  Integrated analysis systems specially adapted therefor, not covered by a single one of the groups G01N30/04 - G01N30/86 · CPC title

• G01N30/06

  Preparation · CPC title

• G01N2030/062

  extracting sample from raw material · CPC title

• G01N30/24

  Automatic injection systems · CPC title