(159u) Monitoring Carbon Dioxide for Carbon Capture, Utilization, and Storage (CCUS) Applications

Accurate and continuous monitoring of dissolved gases – in particular carbon dioxide – in high pressure conditions is still an outstanding challenge in many field applications, including carbon capture and storage and enhanced oil recovery. Transmission infrared (IR) measurements are commonly used for sensing of gaseous mixtures because the relative ease with which they can be obtained. However, their accuracy can be very sensitive to the sample’s scattering properties even under ideal measurement conditions. Besides, these measurements are typically useful for sensing dissolved gases in liquids when the transmission path lengths are below 100 μm. In this paper, we propose a new spectroscopic system for quantitative identification of dissolved gases. This system integrates Raman spectrometer with surface or existing downhole measurements for sensing gases dissolved in water/oil. Identification is achieved by translating spectral peaks of suitable magnitudes to molar ratios of gas components. In fact, this system is complementary to the existing transmission IR measurements and enables a more accurate approach to identify multiple gas components dissolved in both aqueous phase and hydrocarbon liquids.