The Subsea Red Eye® Water-Cut meter is fully qualified to the rigorous API 17D design standard. It is the first fully-marinized subsea water-cut meter on the market. Now true multiphase water cut is affordable on every well. This is the first stand-alone water-cut meter designed for subsea operation. The Subsea Red Eye also offers unparalleled water detection capabilities.
Using near-infrared absorption, the Weatherford Red Eye subsea water-cut meter provides water-onset detection, water-cut measurement, and water-to-hydrate inhibitor ratio measurement. The meter operates in a full three-phase flow stream at any gas volume fraction, and is unaffected by changes in salinity, hydrogen sulfide, or carbon dioxide, thus eliminating the need for corrections related to those factors. It is capable of measuring water cut in a multiphase line and enabling the measurement of relative concentrations of water and hydrate inhibitor.
A subsea flow measurement system typically measures the commingled production from multiple wells. The meter enables operators to track the water production of each individual well. It also offers the ability to track hydrate inhibitor concentrations to ensure that conditions are outside of the hydrate formation range.
Continuous, accurate, and reliable water-cut readings for the life of your oil or gas well
Weatherford is drawing on the performance of the successful Red Eye MP water-cut meter and taking it to the seafloor. Designed to handle the harsh subsea environment, the Red Eye subsea water-cut meter provides robust measurement in oil or gas wells. In addition, the meter can measure relative concentrations of water and typical hydrate inhibitors such as methanol.
With its advanced technology, the Red Eye subsea water-cut meter provides extremely sensitive water-onset detection and is unaffected by changes in salinity, hydrogen sulfide (H2S) or carbon dioxide (CO2) content. The unit is not required to correct for changes in these parameters, unlike other technologies. Also the hardware is ruggedized and marinized to accommodate stringent requirements of subsea applications.
Because of its compact, cost-effective design, you can easily justify a Red Eye subsea meter on each well to measure water cut, recognize water breakthrough, provide a redundant water-cut measurement to multiphase meters, directly measure hydrate inhibitors in the flowline, or trend water behavior in the reservoir.
Industry’s only full-range multiphase water-cut meter
Weatherford has redefined the water-cut meter market by creating a device that measures water-cut and water-methanol concentration without being affected by the presence of free gas. There is no need to know how much gas is present (gas volume fraction) or the pressure-volume-temperature (PVT) properties of the gas, which makes the meter easy to configure and operate.
By measuring key wavelengths in the near-infrared (NIR) spectrum, the Red Eye subsea water-cut meter can easily distinguish water, methanol, and liquid hydrocarbon. At one key wavelength, waterbased absorption is more than 2,500 times greater than any other component in the stream. This remarkable sensitivity enables the meter to detect water at or below 0.25 bbl/MMscf. The unit can also determine if there is insufficient liquid to make an accurate water-cut measurement, which prevents user from taking incorrect action based on inaccurate readings.
Red Eye advantages
• Nonnuclear
• 0 to 100% water-cut detection
• Accurate water-cut in 0 to 99.5% gas void fraction (GVF)
• Low power requirement
• Minimal communication bandwidth required
• Lifespan of 25 or more years
• Mounting options: on the tree or flowline
• Minimal intrusion into the pipeline
Typical Applications
The Red Eye subsea water-cut meter is a reservoir management and production optimization tool. Its optimal use is on dedicated flowlines where individual wells can be monitored. The meter can be mounted upstream or downstream from the choke, in the jumper, or on the manifold skid. The sensor probe projects into the flowstream, so it cannot be used in a pigged line.
• Gas wells
The capability to work in high-gas streams makes the Red Eye product the first practical stand-alone water-cut meter for wet-gas wells. It is insensitive to changes in water- and condensate-density changes.
• Water breakthrough
The unit has an extra optical channel that is extremely sensitive to the presence of water, which enables the meter to directly measure minute changes in low concentrations of water. By trending this measurement, the user can detect if and when water breakthrough occurs.
Hydrate-inhibitor measurement
Because the meter measures methanol and other hydrate inhibitors, it provides a valuable part of a flow-assurance (FA) solution. By monitoring relative concentrations of oil, water, and inhibitor, you know if you are injecting too much or too little inhibitor and can implement a more efficient and cost-effective FA solution.
• Oil wells
Red Eye technology was originally developed for oil wells, and all its capabilities for surface wells remain or have been enhanced for the subsea version. The meter can monitor and adjust its power output as needed, can monitor its own health, and can be recalibrated or receive new firmware remotely.
• Redundancy measurement
The Red Eye subsea meter can be used as a redundant water-cut measurement device as a backup to a subsea multiphase flowmeter (MPFM). Typically, water cut is the most difficult measurement for an MPFM to make. If knowing water-cut measurement is crucial, an operator can use the Red Eye subsea meter with the MPFM to provide redundant measurement for this critical parameter.
• Virtual metering and flow-assurance software support
Some of the most critical inputs for virtual metering (VM) and FA software applications are the direct measurements provided by the Red Eye subsea water-cut meter. The addition of this meter to any subsea production system enables the user to better implement these software packages.
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