Residual Fluid Saturations by Dean and Stark Analysis
ICS can accurately measure water saturations and calculate the Oil Saturations (gravimetrically) using the Dean and Stark Technique.
6 units to run analyses on plug size (1 inch or 1.5 inch) samples are installed. Space for expansion, if required is available.
The Dean and Stark room is a fireproof room with the units placed in isolated cabinets. The room is airconditioned thus preventing excessive humidity from condensing in and on the condensers.
Toluene is predistilled to ensure that water, if any in the toluene is removed prior to the analysis.
The samples are placed in preweighed tares and loaded in the Dean and Stark Apparatus.
The samples are run for continuous minimum period of 72 hours during which water collected in the receiving tubes are monitored. If the process is required to be extended, the units are run on an 8 hour basis.
The samples then undergo further cleaning in toluene and methanol and are weighed at each stage of cleaning.
Grain Volume, grain density and pore volumes of the samples are measured.
Water and oil saturations are calculated using the data generated from the process.
Salient Points of the Dean and Stark Method
Clay hydroxyl waters are not removed.
Accurate water saturations are obtained.
Little attention required during distillation.
Higher concentrations of brines may require higher boiling points of solvents.
Wettability may be altered.
Gypsum bearing cores and shales are subject to damage.
Accurate oil and water density and water salinity imperative for calculations.