The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 11, 2025
Filed:
Dec. 02, 2021
Petroleo Brasileiro S.a.—petrobras, Rio de Janeiro, BR;
Universidade Federal DO Rio Grande DO Norte, Rio Grande do Norte, BR;
Carolina Rayanne Barbosa De Araujo, Parnamirim, BR;
Dennys Correia Da Silva, Natal, BR;
Guilherme Mentges Arruda, Natal, BR;
Marcos Allyson Felipe Rodrigues, Natal, BR;
Alcides De Oliveira Wanderley Neto, Parnamirim, BR;
Daniel Alberton Haas, Rio de Janeiro, BR;
Leonardo Alencar De Oliveira, Rio de Janeiro, BR;
PETROLEO BRASILEIRO S.A.—PETROBRAS, Rio de Janeiro, BR;
UNIVERSIDADE FEDERAL DO RIO GRANDE DO NORTE, Rio Grande Do Norte, BR;
Abstract
The present invention provides for obtaining microemulsion formulations without the presence of an oil phase, and processes for making and using them for removing oil from solid surfaces, specifically sandstone rocks. The microemulsion formulations contain nonionic surfactants of different degrees of ethoxylation (lauryl alcohol with 10, 8 and 6 ethoxylation bonds), short-chain alcohol (1-butanol) and distilled water for the extraction of heavy crude oil impregnated in sandstone rocks. The formulations presented are capable of using low active matter compositions, unlike classical microemulsions which, in most cases, require a high amount of surfactant.