Schlumberger

LFA Live Fluid Analyzer

Overview Library

Identify fluid content to differentiate oil-base contamination for more efficient sampling

The LFA live fluid analyzer analyzes fluids as they flow through the MDT modular formation dynamics tester. In addition to differentiating hydrocarbon types, the LFA analyzer detects and measures the dissolved methane in the live reservoir fluids, which have remained in a single phase under pressure.

Quantify and monitor oil-base mud filtrate

Sampling reservoir fluids in a well drilled with oil-base mud (OBM) or synthetic OBM requires quantifying and monitoring the content of drilling fluid present with the reservoir hydrocarbons flowing through the MDT tester. At certain wavelengths of near-infrared light, the molecular bonds specifically associated with a hydrocarbon fluid vibrate. This vibration results in an absorption of light. The spectrometer of the LFA analyzer measures the light absorption for hydrocarbon identification.

Because methane is present in all naturally occurring hydrocarbons and is absent in driling fluids, any methane detected is due solely to reservoir hydrocarbons. Real-time methane detection and measurement by the LFA analyzer ensures that a high-quality sample is collected by determining when OBM filtrate contamination is reduced to the specified level of sample purity.

Achieve single-phase sampling

The LFA analyzer also incorporates a sensitive, reliable gas detection system that is used to ensure the collection of a valid single-phase fluid sample by adjusting the flowing pressure as necessary to remain above the bubblepoint.

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Differentiating Filtrate from Reservoir Hydrocarbons

The LFA spectrometer uses light in the visible and near infrared range to characterize the fluid flowing through the flowline. The refractometer provides discrimination between the liquid phase and the gas phase.
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