Method and apparatus for analysing composition of hydrocarbon and carbon dioxide gases liberated from drilling fluids

摘要

In various embodiments is described a device and method for rapidly analyzing compositions of gases liberated from drilling fluid using spectral absorption analysis. Specifically the invention describes flowing the sample gas thru a closed path gas cell, irradiating the sample gas with a wide band infrared emitter in the 2 to 5μm wavelength range, measuring the infrared absorbance spectrum in the range of 2 to 5μm using a spectrometer and determining the composition of the gas sample using multivariate analysis of the spectrum. The composition includes the concentration of any one or more, either singularly or in combination, of hydrocarbon gases containing one to eight carbon atoms and carbon dioxide gas.