Determining fluid chemistry of formation fluid by downhole...

Chemistry: analytical and immunological testing – Geochemical – geological – or geothermal exploration – In situ testing

Reexamination Certificate

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C436S164000, C436S165000, C436S166000

Reexamination Certificate

active

07427504

ABSTRACT:
A method for analyzing formation fluid in earth formation surrounding a borehole includes storing analytical reagent in a reagent container in a fluids analyzer in a formation tester and moving the formation tester, including the reagent, downhole. Reagent from the reagent container is injected into formation fluid in the flow-line to make a mixture of formation fluid and reagent. The mixture is moved through a spectral analyzer cell in the fluids analyzer to produce a time-series of optical density measurements at a plurality of wavelengths. A characteristic of formation fluid is determined by spectral analysis of the time-series of optical density measurements.

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