Determining fluid chemistry of formation fluid by downhole reagent injection spectral analysis
First Claim
1. A method for analyzing formation fluid in an earth formation surrounding a borehole, the method comprising:
- in a formation tester having a reagent container coupled to a fluids analyzer via a flow line, storing analytical reagent in the reagent container;
transporting the formation tester downhole;
drawing formation fluid into the flow-line at least once such that the formation fluid is in communication with the fluids analyzer whereby the fluids analyzer establishes a baseline analysis;
while the formation tester remains downhole, mixing a predetermined amount of the analytical reagent with the formation fluid in view of the formation fluid baseline analysis;
moving a reacted mixture of formation fluid and analytical reagent fluid through a spectral analyzer cell in the fluids analyzer; and
performing spectral analysis on the reacted mixture while downhole.
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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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Citations
23 Claims
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1. A method for analyzing formation fluid in an earth formation surrounding a borehole, the method comprising:
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in a formation tester having a reagent container coupled to a fluids analyzer via a flow line, storing analytical reagent in the reagent container; transporting the formation tester downhole; drawing formation fluid into the flow-line at least once such that the formation fluid is in communication with the fluids analyzer whereby the fluids analyzer establishes a baseline analysis; while the formation tester remains downhole, mixing a predetermined amount of the analytical reagent with the formation fluid in view of the formation fluid baseline analysis; moving a reacted mixture of formation fluid and analytical reagent fluid through a spectral analyzer cell in the fluids analyzer; and performing spectral analysis on the reacted mixture while downhole. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification