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EXPERIMENTAL STUDY OF INTERACTION SHALE-FLUID THROUGH IMMERSION TESTS

Claudio Rabe, Sérgio Augusto Barreto da Fontoura, Franklin dos Santos Antunes

Abstract



The present work has as objective the study of the behavior of preserved shale
samples when immersed in aqueous solutions. The obtained results show that the
solutions presented high variations of pH, salinity and electric conductivity, what
indicates ionic migration of salts from the rock to the fluid, and small variations of
Redox potential. Chemical analysis indicate strong migrations of ions from the
rock to the fluid. It can also be observed that the solutions become cloudy, denser
and more viscous. Besides, the samples suffer elevations of its water content,
small variation of its cation exchange capacity and chemical composition, loss of
solid material from superficial disintegration and the development of fractures in
the cores. This work contributes to the understanding of the shale behavior in
presence of drilling fluid water base.


Keywords


interaction shale-fluid; immersion tests; physical-chemical.

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DOI: http://dx.doi.org/10.5380/reterm.v1i2.3508