InSitu Fluid Analyzer Real-Time Downhole Fluid Analysis System

Quantitative fluid measurements at reservoir conditions, in real time

The InSitu Fluid Analyzer real-time downhole fluid analysis (DFA) system integrates InSitu Family downhole quantitative fluid properties measurements to deliver a comprehensive characterization of reservoir fluids at reservoir conditions. Quantified, accurate fluid data that was previously unachievable from wireline logs or the laboratory analysis of collected samples is now possible:

  • hydrocarbon composition (C1, C2, C3–C5, and C6+)
  • gas/oil ratio (GOR)
  • live-oil density and viscosity
  • CO2
  • pH of water (aquifer, connate, injection, or water-base mud [WBM] filtrate)
  • reservoir fluid color
  • free-gas detection
  • downhole fluorescence (dew precipitation in retrograde gas condensates)
  • flowline pressure and temperature (regime of the sample chamber, not the probe)
  • resistivity of reservoir water
  • oil-base mud (OBM) filtrate contamination.

Investigate fluids at their source

The foundation of DFA by the InSitu Fluid Analyzer system is dual optical absorption spectroscopy that introduces the first downhole deployment of a laboratory-grade grating spectrometer in addition to the conventional filter array spectrometer. The filter array spectrometer measures wavelengths in the visible to near-infrared (VIS-NIR) range across 20 channels that indicate the color and molecular vibration absorptions of the reservoir fluid and also show the main absorption peaks of water and CO2. The grating spectrometer focuses 16 channels on the 1,600- to 1,800-nm range, where reservoir fluid has characteristic absorptions that reflect the molecular structure.

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Learn About New Advances in DFA Science

Physics of Reservoir Fluids Video
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