US 12,467,017 B2
Microemulsion systems for extraction and displacement of oil in sandstone rocks
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); and Leonardo Alencar De Oliveira, Rio de Janeiro (BR)
Assigned to PETROLEO BRASILEIRO S.A.—PETROBRAS, Rio de Janeiro (BR); and UNIVERSIDADE FEDERAL DO RIO GRANDE DO NORTE, Rio Grande Do Norte (BR)
Filed by PETROLEO BRASILEIRO S.A.—PETROBRAS, Rio de Janeiro (BR); and UNIVERSIDADE FEDERAL DO RIO GRANDE DO NORTE, Rio Grande do Norte (BR)
Filed on Dec. 2, 2021, as Appl. No. 17/540,727.
Claims priority of application No. 1020210082119 (BR), filed on Apr. 29, 2021.
Prior Publication US 2022/0348843 A1, Nov. 3, 2022
Int. Cl. C09K 23/42 (2022.01); B09C 1/10 (2006.01); C11D 1/72 (2006.01); C11D 3/43 (2006.01); C11D 17/00 (2006.01)
CPC C11D 1/721 (2013.01) [B09C 1/10 (2013.01); C09K 23/42 (2022.01); C11D 3/43 (2013.01); C11D 17/0017 (2013.01); C11D 2111/14 (2024.01)] 3 Claims
OG exemplary drawing
 
1. A method of making a microemulsion formulation, the method comprising mechanically stirring the microemulsion formulation at a speed of up to 1,000 rpm until a single clear phase is formed, wherein the microemulsion formulation consists of a non-ionic surfactant lauryl alcohol ethoxylate in a concentration ranging from 0.01% to 5%, a short-chain alcohol in a concentration ranging from 0.01% to 5%, and water in a concentration ranging from 90% to 99.98%.