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LFA

Live fluid analyzer

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Differentiating oil-based contamination for efficient single-phase fluid sampling

The LFA live fluid analyzer module of the MDT modular formation dynamics tester minimizes the pumping time to acquire representative reservoir fluid for both downhole fluid analysis (DFA) and sample acquisition for laboratory analysis. The contents of the flowline are optically scanned to reliably detect water and oil via real-time spectroscopy and track contamination. The LFA analyzer’s gas refractometer differentiates between gas and liquid.
20,000-psi pressure rating
350-degF temperature rating
H₂S service

How it works: Optical absorption spectrometry

The miscibility of oil-based muds with formation hydrocarbons poses significant challenges for determining contamination by oil-based mud filtrate during downhole fluid analysis (DFA) and sample acquisition.

The LFA analyzer module’s absorption spectrometer uses visible and near-infrared light transmission to reliably detect water and oil by their unique absorption spectra. Because methane is present in all naturally occurring hydrocarbons and absent from drilling fluids, any methane detected is due to reservoir hydrocarbons and not filtrate and can be used to monitor contamination.

LFA live fluid analyzer
The LFA analyzer 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.
LFA live fluid analyzer
LFA single phase assurance graph
The increased sensitivity of the LFA analyzer to free gas ensures that a single-phase sample is collected downhole.
LFA single phase assurance graph

Single-phase assurance by bubblepoint monitoring

The LFA analyzer’s second sensor is a gas refractometer for differentiating between gas and liquid. By monitoring the bubblepoint of the produced fluid to ensure it is below the flowing pressure, representative single-phase fluid is acquired.
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Tech Paper Combining Pressure Falloff and Buildup Testing Using Wireline Formation Tester in Coal Bed Methane Environment

Growing interest in gas reservoirs in nonconventional environments includes coal bed methane, which constitutes a potential important source of hydrocarbon gas in the UK but has been traditionally eclipsed by the conventional offshore oil and gas production.

Case Study Fines Generation Controlled To Extract Low-Contamination Fluid Samples

Quicksilver Probe focused fluid extraction minimizes both drawdown and pumping time in high-weight oil-base mud.

Brochure LFA Live Fluid Analyzer

The LFA life fluid analyzer performs downhole optical analysis for identifying fluids as they flow through the MDT modular formation dynamics tester.

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