Effects of Organic Salts in the Physico-Chemical Properties of Shales
This paper present a study of changes in physic-chemical properties of preserved shale samples when immersed in organic salt solutions. The changes in the immersion fluid are also discussed. An offshore Brazilian shale was used throughout the study. the lab tests were conducted with three kinds of formate brimes. The obtained results indicated that the samples suffered reductions in water content and increased the ph of rock. Changes were observed in the chemical composition of rock pore fluid and in the cation exchange capacity as a function of preponderant ions in the organic salt solution. This immersion test shows great potential in understanding the interaction between drilling fluids and shales.