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Proceedings Paper

An integrated chemical sensor for downhole CO2 monitoring in carbon sequestration
Author(s): Yang Li; Ning Liu; Liangxiong Li; Reid Grigg; Robert Lee
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Paper Abstract

A Severinghaus-type CO2 sensor was prepared for in-situ downhole CO2 monitoring during geological carbon sequestration. The sensor consists of: a porous support material; gas-permeable membranes coated onto the inner and outer surface of the support material; a metal-oxide electrode and a reference electrode; and an internal electrolyte composed of equal amounts of bicarbonate source and a halide salt. The sensor was tested by measuring the output potential between the metal-oxide electrode and the reference electrode. The prepared CO2 sensor demonstrated an excellent linear interrelation between the sensor response potential and the logarithm of the CO2 concentration at high pressure. A microcontroller-based data acquisition system was designed for downhole CO2 sensor data logging, which could convert the sensor's analog signal to a digital signal without discharging the sensor during data collection.

Paper Details

Date Published: 1 May 2009
PDF: 10 pages
Proc. SPIE 7312, Advanced Environmental, Chemical, and Biological Sensing Technologies VI, 73120B (1 May 2009); doi: 10.1117/12.817772
Show Author Affiliations
Yang Li, New Mexico Institute of Mining and Technology (United States)
Ning Liu, New Mexico Institute of Mining and Technology (United States)
Liangxiong Li, New Mexico Institute of Mining and Technology (United States)
Reid Grigg, New Mexico Institute of Mining and Technology (United States)
Robert Lee, New Mexico Institute of Mining and Technology (United States)


Published in SPIE Proceedings Vol. 7312:
Advanced Environmental, Chemical, and Biological Sensing Technologies VI
Tuan Vo-Dinh; Robert A. Lieberman; Günter Gauglitz, Editor(s)

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