Schlumberger

InSitu Viscosity Reservoir Fluid Viscosity Sensor

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Direct measurement of formation fluid viscosity at reservoir conditions

The InSitu Viscosity reservoir fluid viscosity sensor accurately measures hydrocarbon viscosity at reservoir conditions in real time. This newest member of the InSitu Fluid analyzer real-time downhole fluid analysis (DFA) system expands the scope of the detailed fluid fingerprint delivered in real time, instead of waiting for discrete sample analysis from a laboratory. The miniaturized InSitu Viscosity sensor measures viscosity across the range of light to heavy oil in downhole environments: from 0.2 to 300 cP at an accuracy of ±10%.

Vibrating wire method

The measurement principle of the sensor’s vibrating wire is based on its medium-dependent vibration characteristics. The more viscous the fluid, the more abruptly and rapidly the vibration of the sensing element lessens than compared with its behavior in a less-viscous fluid. The oleophilic properties of the sensor make it possible to measure formation hydrocarbon viscosity in the presence of up to 10% immiscible contamination by water. The InSitu Viscosity sensor also incorporates a platinum resistance-temperature detector for temperature measurement at an accuracy of ±1.3 degF.

Vibrating rod method

Viscosity measurement requires density input, which can be obtained from the density-viscosity (DV) rod of the InSitu Density reservoir fluid density sensor or manually entered. In addition to density measurement in any fluid type, the DV rod sensor measures viscosity in miscible systems (oil sampling in oil-base mud) with a range of 0.2 to 50 cP and an accuracy of ±12%.

HPHT qualification

Both the InSitu Viscosity and InSitu Density sensors are high-pressure and high-temperature qualified, and the InSitu Density sensor is also qualified for corrosive environments.

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Fluid Flow and Pressure Data Where Not Previously Possible

Saturn 3D Radial Probe
The self-sealing Saturn 3D radial probe flows fluid circumferentially from the reservoir to extend formation testing to low permeabilities, heavy oil, unconsolidated reservoirs, near-critical fluids, and rugose boreholes.
Visit Saturn 3D Radial Probe page