Co2 concentration measurement in dry gas mixtures

Patent metadata

Field	Value
Publication number	US-2018156751-A1
Application number	US-201715723893-A
Country	US
Kind code	A1
Filing date	Oct 3, 2017
Priority date	Aug 13, 2013
Publication date	Jun 7, 2018
Grant date	—

Abstract

Described herein is an apparatus and methods for characterizing a fluid composition including exposing electrolyte to one fluid mixture, collecting a signal from an electrode in contact with the electrolyte, and simultaneously exposing the electrolyte to a second fluid, collecting a signal from a second electrode in contact with the electrolyte exposed to the second fluid, and comparing the signal difference between the electrodes with the Nerst equation wherein the temperature of the electrolyte is above 488° C. Carbon dioxide, nitrogen, and/or oxygen may be present in the fluid and/or the second fluid.

First claim

We claim:

1 . A method for characterizing a fluid composition, comprising:
exposing electrolyte to a fluid with a composition; collecting a signal from an electrode in contact with the electrolyte; exposing the electrolyte to a second fluid; collecting a signal from a second electrode in contact with the electrolyte exposed to the second fluid; and comparing the signals using the Nerst equation, wherein the the temperature of the electrolyte is above 488° C.

2 . The method of claim 1 , wherein the first fluid is exposed by controlling a fluid pressure.

3 . The method of claim 1 , wherein the second fluid is exposed by controlling a second fluid pressure.

4 . The method of claim 1 , wherein the pressure of the fluid and the second fluid are within 0.5 psi of each other.

5 . The method of claim 1 , wherein the composition is controlled by adjusting the flow of the fluid, the second fluid, or both through a flowmeter.

6 . The method of claim 1 , wherein the composition is controlled by premixing gases in a pressure chamber.

7 . The method of claim 1 , wherein the composition is controlled by generating pure gases in a fixed ratio.

8 . The method of claim 1 , wherein a composition of the second fluid is estimated by comparing the signals from the electrodes wherein the electrolyte is contact with the first and second fluids.

9 . The method of claim 8 , wherein the first fluid comprises a gas selected from the group consisting of carbon dioxide, oxygen, nitrogen, and a combination thereof.

10 . The method of claim 8 , wherein the second fluid comprises a gas selected from the group consisting of carbon dioxide, oxygen, nitrogen, and a combination thereof.

11 . The method of claim 1 , wherein the electrolyte in contact with the first fluid and second fluid comprises carbonate.

12 . The method of claim 1 , wherein the electrolyte in contact with the first and second fluids comprises lithium carbonate and potassium carbonate.

13 . The method of claim 1 , wherein the electrolyte is molten.

14 . The method of claim 1 , wherein the electrolyte is a solid at and below 480° C.

Assignees

• Schlumberger Technology Corp

Inventors

• Perez Albert
• Ramakrishnan Terizhandur S
• Zhang Wenlin
• Jiang Li
• Koveleski Roy
• Elias Quincy K

Classifications

• G01N27/403 Primary

  Cells and electrode assemblies · CPC title

• G01N27/4074

  for detection of gases other than oxygen · CPC title