Schlumberger

CFA Composition Fluid Analyzer

Overview Library

Accurate optical measurement of hydrocarbons and water content guides representative fluid sampling

The CFA composition fluid analyzer module of the MDT modular formation dynamics tester optically scans the contents of the flowline to ensure that representative, high-purity samples are collected. Pumping time for both downhole fluid analysis (DFA) and sample acquisition is minimized through using the CFA analyzer to monitor contamination levels.

Hydrocarbon composition from optical absorption spectrometry

As single-phase reservoir gas flows through the CFA analyzer, a near-infrared optical absorption spectrometer determines in real time the concentration of

  • methane (C1)
  • ethane-propane-butane-pentane (C2–C5)
  • heavier hydrocarbon molecules (C6+)
  • H2O.

With this compositional information, you get the condensate yield, or gas/condensate ratio (CGR), which is the inverse of the GOR.

Single-phase assurance from fluorescence measurement

The CFA analyzer also measures fluorescence emission to identify fluid type and ensure that samples are acquired above the dewpoint for a gas condensate.

Compositional information to optimize completion and production

Optical analysis provides critical real-time information about reservoirs: fluid scanning to identify a compositional gradient in a thick reservoir, identification of layers with different fluids, downhole determination of dewpoint, secondary recovery monitoring, and sampling purity in wells with oil-base mud.

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Determine Purity with Flowline Monitoring of Fluid Type and Gas Fraction

Near-infrared optical absorption spectrometry and fluorescence emission measurements are used to determine gas-fraction concentrations and to identify fluid types, respectively, as fluids flow through the CFA module.
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