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Gas-Oil Ratio of Live Crude Oils Determined by Near-Infrared Spectroscopy

Volume 55, Number 2 (Feb. 2001) Page 197-201

Mullins, Oliver C.; Daigle, Tim; Crowell, Chris; Groenzin, Henning; Joshi, Nikhil B.


The gas-oil ratio (GOR) of crude oil has a tremendous impact on the processes used for oil production from subsurface formations. Determination of GOR thus becomes of central importance to oil operating companies. Here, it is shown that near-infrared (NIR) spectral measurements on single-phase crude oils (with dissolved gas) can be used to obtain a reliable estimate of the GOR. A simple theoretical formulation accurately accounts for the data. Furthermore, the NIR measurement is shown to be compatible with process flow streams at elevated temperatures and pressures.