Claims
- 1. A downhole fluorescence spectrometer apparatus comprising:
a sonde for traversing a well bore; a sample cell for holding a formation sample during testing, the sample cell further comprising a window for passage of light into a sample in the sample cell; an ultraviolet light source for illuminating the sample in the sample cell; and a photo detector for measuring optical spectra to determine a parameter of interest for the sample.
- 2. The fluorescence spectrometer of claim 1, wherein parameter of interest is the peak fluorescence wave length for determining API gravity.
- 3. The fluorescence spectrometer of claim 1, further comprising:
a UV LED light source.
- 4. The fluorescence spectrometer of claim 3, the UV light source further comprising an array of UV LEDs.
- 5. The fluorescence spectrometer of claim 1, further comprising:
a tracer added to filtrate for determining sample clean up of formation filtrate versus crude oil by detecting the degree of the tracer present in the sample.
- 6. The fluorescence spectrometer of claim 5, wherein the tracer is a red or infrared fluorescent.
- 7. The fluorescence spectrometer of claim 1, further comprising:
a depressurization device for depressurizing the sample; and a processor determining an asphaltene precipitation pressure based on a blue green fluorescence ratio change over a depressurization curve.
- 8. The fluorescence spectrometer of claim 1, further comprising:
a correction formula for each channel comprising a correction factor for raw fluorescence response with respect to temperature.
- 9. The fluorescence spectrometer of claim 1, further comprising:
a correction factor dimming of a UV LED Light Source as temperature increases.
- 10. The fluorescence spectrometer of claim 1, further comprising:
a correction factor differences in amplifier gains between channels.
- 11. The fluoresecence spectrometer of claim 1, further comprising:
a processor for monitoring sample cleanup based on fluorescent spectra.
- 12. A method for performing downhole fluorescence spectrometer comprising:
traversing a well bore with a sonde; illuminating with ultraviolet light a formation sample in a sample cell, through a window for passage of light into a sample in the sample cell; and measuring optical spectra to determine a parameter of interest for the sample.
- 13. The method of claim 12, further comprising:
determining API gravity based on peak flourescence for the sample.
- 14. The method of claim 12, further comprising:
providing a UV LED light source.
- 15. The method of claim 12, further comprising:
providing an array of UV LEDs as a UV LED light source.
- 16. The method of claim 12, further comprising:
adding a tracer to filtrate for determining sample clean up of formation filtrate versus crude oil by detecting the degree of the tracer present in the sample.
- 17. The method of claim 16, wherein the tracer is a red or infrared fluorescent.
- 18. The method of claim 12, further comprising:
depressurizing the sample; and determining an asphaltene precipitation pressure based on a blue green fluorescence ratio change over a depressurization curve.
- 19. The method of claim 12, further comprising:
applying a correction formula for each channel comprising a correction factor for raw fluorescence response with respect to temperature.
- 20. The method of claim 12, further comprising:
applying a correction factor dimming of a UV LED Light Source as temperature increases.
- 21. The method of claim 12, further comprising:
applying a correction factor differences in amplifier gains between channels.
- 22. The method of claim 12, further comprising:
monitoring sample cleanup based on fluorescent spectra.
- 23. A computer readable medium containing computer instructions that when executed by a computer perform a method for performing downhole fluorescence spectrometer comprising:
traversing a well bore with a sonde; illuminating with ultraviolet light a formation sample in a sample cell, through a window for passage of light into a sample in the sample cell; and measuring fluorescent spectra to determine a parameter of interest for the sample.
- 24. The medium of claim 23, further comprising:
determining API gravity based on peak fluorescence wavelength of the sample.
- 25. The medium of claim 23, further comprising:
providing a UV LED light source.
- 26. The medium of claim 23, further comprising:
providing an array of UV LEDs as a UV LED light source.
- 27. The medium of claim 23, further comprising:
adding a tracer to filtrate for determining sample clean up of formation filtrate versus crude oil by detecting the degree of the tracer present in the sample.
- 28. The medium of claim 27, wherein the tracer is a red fluorescent.
- 29. The medium of claim 23, further comprising:
depressurizing the sample; and determining an asphaltene precipitation pressure based on a blue green fluorescence ratio change over a depressurization curve.
- 30. The medium of claim 23, further comprising:
applying a correction formula for each channel comprising a correction factor for raw fluorescence response with respect to temperature.
- 31. The medium of claim 23, further comprising:
applying a correction factor dimming of a UV LED Light Source as temperature increases.
- 32. The medium of claim 23, further comprising:
applying a correction factor differences in amplifier gains between channels.
- 33. The medium of claim 23, further comprising:
monitoring sample cleanup based on fluorescence spectra.
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This patent application is a continuation in part of and takes priority from U.S. patent application Ser. No. 10/453,717 filed on Jun. 3, 2003 entitled “A Method and Apparatus for a Downhole Fluorescence Spectrometer” by DiFoggio et al. This patent application also takes priority from U.S. Provisional Patent Application serial No. 60/385,633 filed on Jun. 4, 2002 entitled “A Method and Apparatus for a Downhole Fluorescence Spectrometer” by DiFoggio et al. This application is related to U.S. patent application Ser. No. 10/162,023, entitled “A Method and Apparatus for a High Resolution Downhole Spectrometer” by Rocco DiFoggio, Paul Bergen and Arnold Walkow, filed on Jun. 4, 2002 which is hereby incorporated herein by reference in its entirety. This application is related to U.S. patent application Ser. No. 10/162,030, entitled “A Method and Apparatus for a Derivative Spectrometer” by Rocco DiFoggio, Paul Bergen and Arnold Walkow, filed on Jun. 4, 2002 which is hereby incorporated herein by reference in its entirety. This application is related to the U.S. patent application Ser. No. 10/119,492 filed on Apr. 10, 2002 by Rocco DiFoggio et al., entitled “A Method and Apparatus for Downhole Refractometer And Attenuated Reflectance Spectrometer” which is hereby incorporated herein by reference in its entirety.
Provisional Applications (1)
|
Number |
Date |
Country |
|
60385633 |
Jun 2002 |
US |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
10453717 |
Jun 2003 |
US |
Child |
10641327 |
Aug 2003 |
US |