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Correlation between clay type and performance of swelling inhibitors based on polyetherdiamine in aqueous fluids
Author(s) -
Silva Ítalo Guimarães Medeiros,
Bertolino Luiz Carlos,
Lucas Elizabete Fernandes
Publication year - 2019
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.47661
Subject(s) - swelling , aqueous solution , oil shale , drilling fluid , adsorption , chemical engineering , chemistry , materials science , viscosity , swelling capacity , kinetics , rheology , nuclear chemistry , composite material , organic chemistry , geology , drilling , paleontology , physics , quantum mechanics , engineering , metallurgy
In this work, the linear swelling of four samples of natural clays was evaluated, using poly(propylene glycol) bis(2‐aminopropyl ether)M ¯ n ~230 g mol −1 (PEDA‐230) andM ¯ n ~400 g mol −1 (PEDA‐400) as shale inhibitors for water‐based drilling fluids, in comparison to a commercial shale inhibitor. The swelling kinetics was described by a semiempirical equation. A correlation was found between the cation exchange capacity of the clays and the diffusion kinetic constant of the inhibitors. Increased molar mass of PEDA favored swelling inhibition. The swelling inhibition was also evaluated by rheology, and the results were in agreement with the linear swelling tests. Scanning electron microscopy demonstrated the occurrence of microfractures on the clay surface after water contact, as well as the adsorption of the different shale inhibitors on the clay surfaces after contact with the aqueous inhibited fluid. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47661.