Saturn 3D Radial Probe for Fluid Sampling and Pressure Measurement

Self-sealing ports radially extract fluid while supporting the borehole to enable formation testing where not previously possible

Available in three tool diameters, the family of Saturn 3D radial probes brings the efficiency of zero-sump, large inlet area, circumferential flow to fluids and reservoir environments where conventional single-probe formation testers cannot function:

  • rugose or unstable boreholes
  • thinly laminated formations
  • tight, low-permeability formations
  • unconsolidated formations
  • heavy oil or near-critical fluids.

The resulting high-accuracy pressure measurements and downhole fluid analysis (DFA) provide critical primary data for understanding the reservoir to reduce uncertainties and risk, from pore to pipeline.

Saturn Radial Probe Collects Fluid and Measures Pressure at 0.05-mD/cP Mobility in 6-in Caspian Sea Well

Saturn Radial Probe Collects Fluid and Measures Pressure at 0.05-mD/cP Mobility in 6-in Caspian Sea Well


Oil samples and extended buildup in only 4.5-h total time on station in subsalt carbonate reservoir saves rig time and mitigates operational risk.
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Integral radial inlet with the industry’s largest surface flow area

The drain assembly of the Saturn 3D radial probe positions four self-sealing suction ports at 90° intervals against the borehole wall to pull fluid circumferentially from the reservoir, instead of funneling it to the single access point of a conventional probe. Because fluid is extracted across a large reservoir volume, flow is readily induced and sustained, even for viscous fluids and in low-mobility and laminated formations. The assembly also supports the formation to prevent sanding and collapse.

Pressure measurement at low mobility and low permeability

The technology that makes the Saturn probe excel at fluid extraction also empowers formation pressure testing. Whereas the highest-performing conventional probes lose functionality in mobilities ranging from 10- to 0.1-mD/cP, the Saturn probe performs reliably in mobilities extending down to 0.01 mD/cP. With minimal storage volume effects and greatly reduced susceptibility to supercharging, the Saturn probe brings unprecedented pressure testing capability to very tight formations.

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Redefining the Limits of Possible

The Saturn 3D radial probe increases the probe surface area by more than 90 times.
The Saturn probe’s larger surface flow area makes it easy to flow heavy oil at low mobilities and from low-permeability reservoirs for fluid sampling and pressure testing.
View surface area comparison