Radiant energy – Geological testing or irradiation – With sampling
Patent
1997-04-10
1999-01-12
Glick, Edward J.
Radiant energy
Geological testing or irradiation
With sampling
250256, 250343, 25033913, G01N 2135, G01N 3324
Patent
active
058594302
ABSTRACT:
A borehole tool analyzes the composition of gases flowing from a formation. The tool includes an optical fluid analyzer (OFA) and a gas analysis module (GAM). The OFA determines when fluid flowing into the tool has become substantially only gas. The gas is then diverted to the GAM, thereby avoiding the possibility of oil depositing itself on a optical window and interfering with a proper analysis. The GAM includes a near infrared ray light source, at least one photo-detector, a gas sample cell (or cells) having portions with different path lengths, each portion having an optical window, and fiber optics which direct light in first paths from the source to the sample cell, and from the sample cell to the photo-detectors. By providing cells with different path lengths, issues of dynamic range are obviated. The GAM also preferably includes a second optical path which goes directly from the light source to the photo-detectors and is used for canceling drift, and a third optical path which goes from the light source, through a known standard such as methane to the photo-detectors and is used for compensation of shifts in actual hydrocarbon peak locations or shifts in optical filter wavelengths. Analysis of the different hydrocarbon gas components of the gas stream is conducted by analysis of selected CH vibrational peaks in the 5700 cm.sup.-1 to 6100 cm.sup.-1 range.
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Mullins Oliver C.
Wu Xu
Glick Edward J.
Gordon David P.
Jiron Darren M.
Schlumberger Technology Corporation
Smith Keith G. W.
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