An integrated chemical sensor for downhole CO2 monitoring in carbon sequestration

Yang Li; Ning Liu; Liangxiong Li; Reid Grigg; Robert Lee

doi:10.1117/12.817772

30 April 2009 An integrated chemical sensor for downhole CO₂ monitoring in carbon sequestration

Yang Li, Ning Liu, Liangxiong Li, Reid Grigg, Robert Lee

Proceedings Volume 7312, Advanced Environmental, Chemical, and Biological Sensing Technologies VI; 73120B (2009) https://doi.org/10.1117/12.817772
Event: SPIE Defense, Security, and Sensing, 2009, Orlando, Florida, United States

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.

Citation Download Citation

Yang Li, Ning Liu, Liangxiong Li, Reid Grigg, and Robert Lee "An integrated chemical sensor for downhole CO₂ monitoring in carbon sequestration", Proc. SPIE 7312, Advanced Environmental, Chemical, and Biological Sensing Technologies VI, 73120B (30 April 2009); https://doi.org/10.1117/12.817772

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