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:
Jun. 17, 2025
Filed:
Jul. 31, 2023
Inpex Corporation, Tokyo, JP;
Hirosaki University, Hirosaki, JP;
Nissan Chemical Corporation, Tokyo, JP;
Takashi Hiraoka, Tokyo, JP;
Hideharu Yonebayashi, Tokyo, JP;
Yoshihiro Miyagawa, Tokyo, JP;
Masanobu Sagisaka, Hirosaki, JP;
Masashi Abe, Sodegaura, JP;
INPEX CORPORATION, Tokyo, JP;
HIROSAKI UNIVERSITY, Hirosaki, JP;
NISSAN CHEMICAL CORPORATION, Tokyo, JP;
Abstract
An aqueous sol used in COfoam flooding, one of EOR flooding methods for recovering crude oil by injection into the oil reservoir of an onshore or offshore oil field, the aqueous sol increasing foam stability even over a substantial period of time, at high temperatures and pressures, and in salt water, thus improving crude oil recovery rate. The aqueous sol for increasing stability of froth or emulsion in a mixture containing carbon dioxide, water, and oil in COfoam flooding of EOR, the sol including silica particles having an average particle diameter of 1 to 100 nm as measured by dynamic light scattering and having surfaces at least partially coated with a silane compound having a hydrolyzable group, the silica particles serving as a dispersoid and dispersed in an aqueous solvent having a pH of 1.0 to 6.0 serving as a dispersion medium.