Real-time calibration for downhole spectrometer
First Claim
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1. An apparatus for performing real-time analysis of a subterranean formation fluid, comprising:
- a light source configured to transmit at least a sample signal through a sample of the subterranean formation fluid and a reference signal;
at least one photodetector configured to continuously detect the sample and reference signals;
an electronics assembly configured to compensate for drift in the detected sample signal in real-time based on the value of the detected reference signal.
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Abstract
An apparatus for performing real-time analysis of a subterranean formation fluid includes a light source configured to transmit at least a sample signal through a sample of the subterranean formation fluid and a reference signal, at least one photodetector configured to continuously detect the sample and reference signals, and an electronics assembly configured to compensate for drift in the detected sample signal in real-time based on the value of the detected reference signal.
44 Citations
32 Claims
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1. An apparatus for performing real-time analysis of a subterranean formation fluid, comprising:
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a light source configured to transmit at least a sample signal through a sample of the subterranean formation fluid and a reference signal;
at least one photodetector configured to continuously detect the sample and reference signals;
an electronics assembly configured to compensate for drift in the detected sample signal in real-time based on the value of the detected reference signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for analyzing a subterranean formation fluid, comprising:
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transmitting a sample signal through a sample of the subterranean formation fluid;
continuously transmitting a reference signal;
continuously detecting the sample and reference signals using at least one photodetector;
correcting drift in the detected sample signal in real-time based on the value of the detected reference signal. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A method for analyzing a downhole fluid, comprising:
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transmitting a sample signal through a sample of the downhole fluid using a light source;
transmitting a reference signal using the light source;
continuously measuring the reference signal to compensate for drift in the sample signal in real-time. - View Dependent Claims (30)
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31. An apparatus for performing real-time analysis of a subterranean formation fluid, comprising:
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a light source;
a reference signal continuously transmitted by the light source;
a sample signal transmitted by the light source through a sample of the subterranean formation fluid;
a modulator for modulating the sample and reference signals at different frequencies;
at least one photodetector configured to continuously detect the sample and reference signals;
an electronics assembly configured to demodulate the sample signal and the reference and to compensate for drift in the detected sample signal in real-time based on the value of the detected reference signal.
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32. An apparatus for performing real-time analysis of a subterranean formation fluid, comprising:
a downhole tool, the downhole tool comprising a fluid analysis module, the fluid analysis module comprising;
a light source configured to transmit at least a sample signal through a sample of the subterranean formation fluid and a reference signal;
at least one photodetector configured to continuously detect the sample and reference signals;
an electronics assembly configured to compensate for drift in the detected sample signal in real-time based on the value of the detected reference signal.
Specification