Nissan Chemical Corporation

Inpex Corporation

Hirosaki University

Hideharu Yonebayashi

Masashi Abe

Masanobu Sagisaka

Takashi Hiraoka

Yoshihiro Miyagawa

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.

Growing community of inventors

Tokyo, Japan

Hideharu Yonebayashi