Fluid Density Radioactive Tool

What Is Fluid Density Radioactive Tool?

The Netssu FDR (Fluid Density Radioactive Tool) measures borehole fluid density by a radioactive technique. Part of the fluid flow passes through the tool between a low activity Americium 241 gamma source and a scintillation gamma-ray detector. An increase in the average fluid density in the sample volume causes a reduction in received counts. The detector is shielded to reduce interference from the radioactive scale. The electronics interface to the One-Line™ tool bus for use in memory or surface readout PL tool strings. The single conductor passes through the tool carrying telemetry and power.

Purpose

The purpose of the FDR is to measure fluid density of a sample as it flows through the tool. The average density of this volume is measured whether the flow is single or multiphase. This measurement can be used to determine the proportions of two phases of different but known densities in a two-phase fluid mixture. For example, water fraction may be calculated. If, in addition, the total fluid mixture flowrate and the slippage of one phase relative to the other are known then calculations can be made to determine the flowrate of each of the two fluids along the axis of the well. Note that fluid density outside the sample volume is not measured. The measure cavity is asymmetrical to prevent preferential hold up of a single phase.

Applications

• Multiphase production profiling.
• Fluid Identification.
• Horizontal/highly deviated wells.
• High fluid flow rates.

For more information, please contact us.