Process for the production of nanoparticles and compositions
AssigneesPetroleo Brasileiro S.A. - Petrobras, Universidade de Sao Paulo-USP
InventorsKoiti ARAKI, Sergio Hiroshi TOMA, Delmárcio Gomes DA SILVA, Henrique Eisi TOMA, Rita de Cássia Comis WAGNER, Bernardo Coutinho Camilo DOS SANTOS, Alex Tadeu de Almeida WALDMANN
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Abstract
This invention describes the development of technology for the preparation of superparamagnetic lipophilic nanofluids, as well as of drilling fluid additives based on the aforementioned nanofluids, which improve the properties which form walls or mud filter cakes and concomitantly act as contrast agents in RMN logging.
Claims16
-16. (canceled)
Process of the production of nanoparticles, characterized by comprising the following steps:
- a) Preparing a precursor from a reaction of at least one carboxylate, preferentially aliphatic, with at least one transition metal ion, selected from the group consisting of Fe(III), Co(III), Mn(III), Cr(III), Ni(II), Cu(II) and Zn(II) in aqueous medium;
- b) Under reflux, adding to the precursor of the step a) a high boiling point oil phase (180 to 310° C.), and at least one reducing agent.
Dependencies are inferred from the claim text.