System and Method for Analyzing a Gaseous Sample Extracted From a Drilling Fluid Coming From a Wellbore
First Claim
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1. A system for analyzing a gaseous sample extracted from a drilling fluid coming from a wellbore, wherein the system comprises a surface assembly, situated outside of the wellbore and including:
- an extractor for extracting a gaseous sample from the drilling fluid,a quantification device connected to the extractor for quantifying at least a gaseous constituent contained the gaseous sample,wherein the quantification device comprises at least a photoacoustic cell in fluid communication with the extractor, at least a light source for emitting a light beam at a predetermined emission spectrum in the photoacoustic cell, at least an acoustic detector positioned in the photoacoustic cell and a processor for calculating a parameter relative to the quantity of the gaseous constituent on the basis of a signal obtained from the detector.
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Abstract
The disclosure relates to a system and method for analyzing a gaseous sample extracted from a drilling fluid coming from a wellbore. The system comprises a surface assembly, situated outside of the wellbore and including:
- an extractor for extracting a gaseous sample from the drilling fluid,
- a quantification device connected to the extractor for quantifying at least a gaseous constituent contained the gaseous sample.
The quantification device comprises at least a photoacoustic cell in fluid communication with the extractor, at least a light source for emitting a light beam at a predetermined emission spectrum in the photoacoustic cell, at least an acoustic detector positioned in the photoacoustic cell and a processor for calculating a parameter relative to the quantity of the gaseous constituent on the basis of a signal obtained from the detector.
41 Citations
15 Claims
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1. A system for analyzing a gaseous sample extracted from a drilling fluid coming from a wellbore, wherein the system comprises a surface assembly, situated outside of the wellbore and including:
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an extractor for extracting a gaseous sample from the drilling fluid, a quantification device connected to the extractor for quantifying at least a gaseous constituent contained the gaseous sample, wherein the quantification device comprises at least a photoacoustic cell in fluid communication with the extractor, at least a light source for emitting a light beam at a predetermined emission spectrum in the photoacoustic cell, at least an acoustic detector positioned in the photoacoustic cell and a processor for calculating a parameter relative to the quantity of the gaseous constituent on the basis of a signal obtained from the detector. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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10. The system according to claim 1, comprising at least two photoacoustic cells in parallel or in series.
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11. The system according to claim 1, wherein at least one of the wavelength values of the light sources are chosen in the following areas:
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Between 3.30 and 3.45 μ
m,Between 6.67 and 6.75 μ
mBetween 1, 58 and 1, 67 μ
mBetween 7.52 and 7.70 μ
mBetween 12, 05 and 12, 34 μ
m.
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12. The system according to claim 1, wherein the emission spectrum of the light beams are chosen so that the detector is able to detect gaseous constituents comprising at least one atom of carbon, including in particular an alkane with less than 15 carbon atoms and in particular methane (C1), ethane (C2), propane (C3) such as n-propane or isopropane, butane (C4) such as isobutane or other isomers of butane, pentane (C5) such as isopentane or other isomers of pentane.
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13. The system according to claim 1, wherein the emission spectrum of the light beams are chosen so that the detector is able to detect two isotopes of at least a gaseous constituent such as comprising at least one atom of carbon and in particular methane, ethane or propane, the processor being configured to calculate the isotopic ratio of the gaseous constituents on the basis of the signal obtained from the detectors.
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14. A method for analyzing a gaseous sample containing at least a gaseous constituent extracted from a drilling fluid coming from a wellbore, comprising:
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extracting a gaseous sample from the drilling fluid with a surface assembly situated outside of the wellbore, emitting at least a light beam having a predetermined emission spectrum in a photoacoustic cell where the gaseous sample is contained, detecting an acoustic signal due to the interactions of the light beam and the gaseous sample for the predetermined emission spectrum, calculating a parameter relative to the quantity of at least one of the gaseous constituent on the basis of a signal obtained from the detector. - View Dependent Claims (15)
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Specification