Red Eye® 2G Water-Cut Meter

The Red Eye 2G water-cut meter uses patented optical sensor technology to accurately measure the full range of water cut (0 to 100%) in a commingled oil and water stream. Very high accuracy across all water-cut levels and easy installation and configuration make this unique meter suitable for numerous applications. The meter can be used in stand alone mode to measure and report instantaneous water cut and in conjunction with the net oil computer (NOC) to perform timed production well tests, or as part of the Red Eye multiphase metering system (REMMS).


  • Unmatched accuracy in real world situations
  • Insensitive to entrained gas
  • Ignores salinity and dissolved gas
  • Easy installation, calibration and service

How Does the Red Eye 2G Water-Cut Meter Work?

The measurement is based on near-infrared absorption spectroscopy where oil and water are easily differentiated.

The Red Eye 2G water-cut meter achieves unmatched accuracy at high water-cut levels as well as lower water-cut measurements by simultaneously measuring multiple wavelengths that include both water and oil absorbent peaks.

Absorption Spectroscopy

Red Eye 2G Water-Cut Meter

The graph shows several bands of infrared wavelengths that are absorbed by the components of the produced fluids.

Unmatched Accuracy in Production Environments

The Red Eye 2G water-cut meter delivers high accuracy performance under actual production environments, not just in laboratory conditions. Water-cut measurement uncertainties are less than 2% even with situations of varying salinity and when entrained gas is present.

Gas Volume Fraction (GVF) Effects

This meter is designed to handle real-world issues such as entrained gas. By using the technique of multiple wavelength measurements as employed by the Red Eye water-cut meter, great tolerance to varying gas conditions is possible. GVFs of up to 5% have no effect on unit accuracy and up to 20% have only minimal effect.

Emulsion Handling and Salinity Effects

The Red Eye 2G water-cut meter works with emulsions as well as fluids that separate easily. Emulsions tend to cause light scattering in addition to absorption. The scattering is equal at all wavelengths whereas the absorption is strongly dependent on wavelength. The water-cut meter nulls out the scattering effect and measures the absorptions which are directly related to the water cut. Salinity has no effect on the measurement since water absorption is based on the water molecule itself, not the dissolved salts. Accuracy is, therefore, unaffected by different and changing salinities.

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