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- Title
Correlation between clay type and performance of swelling inhibitors based on polyetherdiamine in aqueous fluids.
- Authors
Silva, Ítalo Guimarães Medeiros; Lucas, Elizabete Fernandes; Bertolino, Luiz Carlos
- Abstract
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) and M¯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. Representation of a drilling rig and different geological formations (left). Microscopy images of highly compacted clay before the contact with water (center). Clay swelling caused by water led to the occurrence of several microfractures (top right). PEDA effectively minimized the clay swelling (bottom right).
- Subjects
AMINES; SWELLING of materials; CLAY; AQUEOUS solutions; RHEOLOGY; DIFFUSION kinetics
- Publication
Journal of Applied Polymer Science, 2019, Vol 136, Issue 25, pN.PAG
- ISSN
0021-8995
- Publication type
Article
- DOI
10.1002/app.47661