US 12,276,609 B2
Fluorescence spectroscopy for estimation of fluid contamination
Sandip Maity, Manama (BH); and Ansgar Cartellieri, Lower Saxony (DE)
Assigned to BAKER HUGHES OILFIELD OPERATIONS LLC, Houston, TX (US)
Filed by Sandip Maity, Manama (BH); and Ansgar Cartellieri, Lower Saxony (DE)
Filed on Aug. 16, 2022, as Appl. No. 17/888,578.
Prior Publication US 2024/0060889 A1, Feb. 22, 2024
Int. Cl. G01N 21/64 (2006.01); G01N 1/14 (2006.01); G01N 21/88 (2006.01)
CPC G01N 21/64 (2013.01) [G01N 1/14 (2013.01); G01N 21/88 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method of analyzing a fluid, comprising:
acquiring a sample of the fluid extracted from a subterranean region proximate to a borehole, the borehole including an injected fluid;
applying light having a first excitation wavelength to the fluid sample, and measuring a first fluorescence spectrum;
comparing the first fluorescence spectrum to at least one of: a reference fluorescence spectrum corresponding to a fluid having injected fluid contamination, and a second fluorescence spectrum based on applying light having a second excitation wavelength to the fluid sample; and
estimating a level of contamination of the fluid sample with the injected fluid based on the comparing, wherein comparing the first fluorescence spectrum to the reference fluorescence spectrum includes identifying a first peak in the first fluorescence spectrum, identifying a second peak in the reference fluorescence spectrum, and estimating a wavelength shift between the first peak and the second peak.