Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Reexamination Certificate
2005-02-04
2008-09-09
Porta, David P. (Department: 2884)
Radiant energy
Geological testing or irradiation
Well testing apparatus and methods
Reexamination Certificate
active
07423258
ABSTRACT:
The present invention provides a method and apparatus for estimating a property of a fluid downhole by exposing the fluid to modulated light downhole and sensing changes in intensity of infrared radiation from the downhole fluid to estimate the property of the downhole fluid. The present invention senses changes in intensity of light by converting the changes to transient changes in temperature of a detector, such as a pyroelectric detector. The present invention performs spectroscopic analysis of fluids by optically filtering the light allowed to impinge on a pyroelectric detector, converting the changes in temperature of the pyroelectric detector to a signal and converting the signal to estimate the property of the downhole fluid. The light source is modulated by mechanically chopping the beam or by electrically pulsing the light source or by steering the beam between different path lengths of sample or between a reference cell (filled with a reference fluid or empty) and a sample-filled cell.
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Bergren Paul
DiFoggio Rocco
Baker Hughes Incorporated
Madan, Mossman and Sriram, P.C.
Porta David P.
Vu Mindy
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