Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Reexamination Certificate
2005-07-19
2010-06-22
Porta, David P (Department: 2884)
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
C250S269100
Reexamination Certificate
active
07741605
ABSTRACT:
A method of detecting gas conveyed in a drilling fluid (M) returning from a well (26), which method comprises the steps of:(a) extracting gas from said drilling fluid (M);(b) transmitting infra-red radiation through said gas; and(c) detecting with a detector (50) infra-red red radiation that has passed through said gas and providing an output signal representative thereof;characterised by the step of:(d) examining the intensity of a portion of the infra-red spectrum within a range of approximately 3.1 μm and 3.6 μm to estimate whether or not said gas comprises any light or heavy hydrocarbons.
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Debliek John Wesley
Gunn Scott Edwin
Porta David P
Taningco Marcus H
Varco I/P Inc.
Williams Morgan & Amerson P.C.
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