Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Reexamination Certificate
2007-02-06
2007-02-06
Gabor, Otilia (Department: 2884)
Radiant energy
Geological testing or irradiation
Well testing apparatus and methods
C250S268000, C250S254000, C250S253000, C250S256000, C250S255000
Reexamination Certificate
active
10798686
ABSTRACT:
The present invention describes a unique method and apparatus for applying near-infrared spectroscopy to estimate weight percent of methane in crude oil from which one can then infer gas-oil ratio (GOR) of crude oils downhole in real time while collecting a fluid sample. The correlation equations provided by this invention use two wavelengths, one centered at 1670 and the other centered at 1682 nm. Both wavelengths are primarily sensitive to the methane peak absorption. To significantly improve the fit, non-spectroscopic parameters, such as temperature or pressure, can be included in the correlation equation. Also, this invention can be used to monitor sample cleanup by monitoring the increase in GOR associated with cleanup as a fluid being pumped from the formation transitions from mostly gas-free filtrate to mostly gas-containing crude oil.
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Baker Hughes Incorporated
Gabor Otilia
Madan Mossman & Sriram P.C.
Sung Christine
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