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Article Dans Une Revue Science and Technology for Energy Transition Année : 2023

Quantitative monitoring of dissolved gases in a flooded borehole: calibration of the analytical tools

Van-Hoan Le
Marie-Camille Caumon
Jacques Pironon
Philippe de Donato
Aurélien Randi
  • Fonction : Auteur
Catherine Lorgeoux
  • Fonction : Auteur
Odile Barres

Résumé

Gas monitoring is a prerequisite to understanding the exchange, diffusion, and migration processes of natural gases within underground environments, which are involved in several applications such as geological sequestration of CO 2 . In this study, three different techniques (micro-GC, infrared, and Raman spectroscopies) were deployed on an experimental flooded borehole for monitoring purposes after CO 2 injection. The aim was to develop a real-time chemical monitoring device to follow dissolved gas concentrations by measurements in water inside the borehole but also at the surface through a gas collection system in equilibrium with the borehole water. However, all three techniques must be calibrated to provide the most accurate quantitative data. For this, a first step of calibration in the laboratory was carried out. A new calibrations were required to determine partial pressure and/or concentrations of gases in water or in the gas collection system. For gas phase analysis, micro-GC, FTIR spectroscopy, and Raman spectroscopy were compared. New calibration of the micro-GC was done for CO 2 , CH 4 , and N 2 with uncertainty from ±100 ppm to 1.5 mol% depending on the bulk concentration and the type of gas. The FTIR and Raman spectrometers were previously calibrated for CO 2 , and CO 2 , N 2 , O 2 , CH 4 , and H 2 O, respectively with an accuracy of 1–6% depending on concentration scale, gas and spectrometer. Dissolved CO 2 in water was measured using a Raman spectrometer equipped with an immersion probe. The uncertainty on the predicted dissolved CO 2 concentration and partial pressure was ±0.003 mol·kg −1 and ±0.05 bar, respectively.
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Dates et versions

hal-04216514 , version 1 (25-09-2023)

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Paternité

Identifiants

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Van-Hoan Le, Marie-Camille Caumon, Jacques Pironon, Philippe de Donato, Médéric Piedevache, et al.. Quantitative monitoring of dissolved gases in a flooded borehole: calibration of the analytical tools. Science and Technology for Energy Transition, 2023, 78, pp.21. ⟨10.2516/stet/2023017⟩. ⟨hal-04216514⟩
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