Down hole gas analyzer method and apparatus
First Claim
1. A bore hole apparatus for analyzing the carbon dioxide concentration in a sample down hole in a bore hole, comprising:
- a chamber having a piston for defining an initial sample volume in the chamber for containing an initial fluid sample wherein the piston is slidably disposed within the chamber for selectively expanding the chamber initial volume of the chamber and decreasing the pressure within the chamber to decompress the fluid sample;
a transmitter for discharging infrared light a first sensor for measuring at least one of absorption, transmittance or attenuated total reflectance of infrared light for the 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.
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Accused Products
Abstract
A logging while drilling and wire line system for analyzing the concentration of carbon dioxide or another substance, in a sample down hole in a bore hole. A chamber is filled with a sample that may be fluid, or condensate and gas. The interior chamber volume is selectably expandable for decompression of the sample. The sample may alternately be decompressed by allowing a sample at formation pressure to enter the chamber at a lower pressure, thereby decompressing the sample. A sensor measures the absorbance, transmittance or attenuated total reflectance of the infrared light. Mid and near infrared light is utilized to identify carbon dioxide, water and a plurality of hydrocarbons. A wiper cleans the transmitter and sensor between readings to reduce measurement error caused by fluid sample contamination.
42 Citations
26 Claims
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1. A bore hole apparatus for analyzing the carbon dioxide concentration in a sample down hole in a bore hole, comprising:
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a chamber having a piston for defining an initial sample volume in the chamber for containing an initial fluid sample wherein the piston is slidably disposed within the chamber for selectively expanding the chamber initial volume of the chamber and decreasing the pressure within the chamber to decompress the fluid sample;
a transmitter for discharging infrared light a first sensor for measuring at least one of absorption, transmittance or attenuated total reflectance of infrared light for the 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, 12)
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10. A bore hole apparatus for analyzing the carbon dioxide concentration in a sample down hole in a bore hole, comprising:
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a chamber having a piston wherein the piston is slidably disposed within the chamber for defining an initial sample volume in the chamber for receiving an initial fluid sample, wherein the initial sample volume of the chamber is selectively expanded, to reduce the the pressure in the sample chamber to a pressure lower than the pressure of the sample prior to the sample entering the chamber, thereby selectively decompressing the sample as it enters the initial sample volume;
a transmitter for discharging infrared light;
a first sensor for measuring at least one of absorption, transmittance or attenuated total reflectance of infrared light for the fluid sample, the first sensor generating a signal representing the carbon dioxide concentration in the fluid sample; and
a device for receiving said signal and for determining the sample carbon dioxide concentration. - View Dependent Claims (11, 13, 15, 16, 17, 18, 19, 20, 21, 22, 24, 25, 26)
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14. A method for analyzing the carbon dioxide concentration in a sample down hole in a bore hole, comprising:
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providing a chamber having a piston for defining an initial sample volume in the chamber for containing an initial fluid sample wherein the piston is slidably disposed within the chamber for selectively expanding the chamber initial volume of the chamber and decreasing the pressure within the chamber to decompress the fluid sample;
providing a transmitter for discharging infrared light;
providing a first sensor for measuring at least one of absorption, transmittance or attenuated total reflectance of infrared light for the fluid sample and for generating a signal representing the carbon dioxide concentration in the fluid sample; and
providing a processor for receiving said signal and for determining the fluid sample carbon dioxide concentration.
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23. A method for for analyzing the carbon dioxide concentration in a sample down hole in a bore hole, comprising:
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providing a chamber having a piston wherein the piston is slidably disposed within the chamber for defining an initial sample volume in the chamber for receiving an initial fluid sample, wherein the initial sample volume of the chamber is selectively expanded, to reduce the the pressure in the sample chamber to a pressure lower than the pressure of the sample prior to the sample entering the chamber, thereby selectively decompressing the sample as it enters the initial sample volume;
providing a transmitter for discharging infrared light;
providing a first sensor for measuring at least one of absorption, transmittance or attenuated total reflectance of infrared light for the fluid sample, the first sensor generating a signal representing the carbon dioxide concentration in the fluid sample; and
providing a device for receiving said signal and for determining the sample carbon dioxide concentration.
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Specification