Downhole carbon dioxide gas analyzer
First Claim
1. A bore hole apparatus for analyzing the carbon dioxide concentration in a fluid sample down hole in a bore hole, comprising:
- a decompression chamber having a piston for defining an initial volume in the decompression chamber for containing the fluid sample wherein the piston is slidably disposed within the decompression chamber for controllably expanding the decompression chamber initial volume of the decompression chamber and decreasing the pressure within the decompression chamber to decompress the fluid sample;
a transmitter for discharging mid-infrared light;
a first sensor for measuring the absorption of mid-infrared light by the decompressed fluid sample and for generating a signal representing the carbon dioxide concentration in the fluid sample; and
a processor for receiving said signal and for determining the fluid sample carbon dioxide concentration.
1 Assignment
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Accused Products
Abstract
A logging tool system for analyzing the carbon dioxide concentration in a fluid sample downhole in a borehole. A chamber is filled with the fluid sample and is closed to isolate the fluid sample from the borehole. The interior chamber volume is expanded to decompress the fluid sample, and a transmitter discharges light in the mid-infrared range. A sensor measures the absorbance of mid-infrared light by the decompressed fluid sample and generates a signal representing the carbon dioxide concentration. Mid-infrared light absorbance in the range between 4.1 and 4.4 microns can be analyzed by the processor to identify the carbon dioxide concentration in the fluid sample, and infrared absorbance in the mid-infrared range between 3.2 and 3.6 microns can be analyzed to identify methyl and metheylene components. A wiper cleans the transmitter and sensor between readings to reduce measurement errors caused by fluid sample contamination.
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Citations
23 Claims
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1. A bore hole apparatus for analyzing the carbon dioxide concentration in a fluid sample down hole in a bore hole, comprising:
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a decompression chamber having a piston for defining an initial volume in the decompression chamber for containing the fluid sample wherein the piston is slidably disposed within the decompression chamber for controllably expanding the decompression chamber initial volume of the decompression chamber and decreasing the pressure within the decompression chamber to decompress the fluid sample;
a transmitter for discharging mid-infrared light;
a first sensor for measuring the absorption of mid-infrared light by the decompressed fluid sample and for generating a signal representing the carbon dioxide concentration in the fluid sample; and
a processor for receiving said signal and for determining the fluid sample carbon dioxide concentration. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for analyzing the carbon dioxide concentration in a fluid sample down hole in a bore hole, comprising the steps of:
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deploying into a bore hole a housing containing a decompression chamber having a piston and integrated wiper for defining an initial volume in the decompression chamber to define the piston being set to define an initial chamber volume;
receiving a measured quantity of the fluid sample into the initial chamber volume;
closing said chamber to isolate the fluid sample from the bore hole;
expanding said initial chamber volume to decompress the fluid sample;
operating a transmitter to discharge mid-infrared light through the decompressed fluid sample; and
operating a sensor to measure the decompressed fluid sample mid-infrared light absorbance and to generate a signal representing the carbon dioxide concentration. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A method for analyzing the carbon dioxide concentration in a fluid sample down hole in a bore hole, comprising the steps of:
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deploying a decompression chamber having a piston and integrated wiper for defining an initial volume in the decompression chamber into the bore hole, the piston being set to define an initial chamber volume;
decompressing the decompression chamber so that a vacuum exists in the decompression chamber;
moving the fluid sample into the evacuated chamber volume;
operating a transmitter to discharge mid-infrared light through the decompressed fluid sample; and
operating a sensor to measure the decompressed fluid sample mid-infrared light absorbance and to generate a signal representing the carbon dioxide concentration.
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Specification