InSitu CO2

Measurement of CO2 Content with the InSitu Fluid Analyzer System

Carbon dioxide is present in the fluids of many reservoirs and must be accurately accounted for when developing hydrocarbon reserves. However, reliable quantification of CO₂ from reservoir fluid samples can be difficult, especially if there is water in the collected samples, because CO₂ easily reacts with water, whether from mud filtrate contamination or formation water.

The measurement of CO₂ content by the InSitu Fluid Analyzer system is performed with the filter array spectrometer. A dedicated channel to the CO₂ absorption peak is complemented with dual baseline channels above and below that subtract out the overlapping spectrum of hydrocarbon and small amounts of water. The new channels and enhanced algorithm make it possible to plot the CO₂ content in real time, together with upper and lower accuracy tolerances on the measurement. This gives increased confidence in the measurement accuracy under different environments.