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An improved predictive correlation for the induction time of CaCO3 scale formation during flow in porous media
E Stamatakis1, A Stubos, J Palyvos
1School of Chemical Engineering, National Technical University of Athens (NTUA), Greece; National Centre for Scientific Research Demokritos (NCSRD), 15310 Agia Paraskevi, Attica, Greece. manos@ife.no
Abstract:
The induction time, tind, of calcium carbonate precipitation in porous rocks was experimentally measured under dynamic conditions at temperatures from 25 to 120 degrees C with the use of a radiotracer technique, where the gamma-emitting nuclide 47Ca was used as a tracer in order to monitor the scale deposition at real time. Based upon nucleation theory and experimental observations, the following improved correlation is proposed: This equation predicts satisfactorily the induction time of calcium carbonate scale formation under specific dynamic (flow) conditions in the near-well region (T is the absolute temperature in K, and SI is the saturation index, SI=logSR, where SR is the saturation ratio).
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