Hirosaki University

Nissan Chemical Industries Limited

Nissan Chemical Corporation

Inpex Corporation

Masanobu Sagisaka

Masahiro Hida

Masashi Abe

Takashi Hiraoka

Yasufumi Shikauchi

Hideharu Yonebayashi

Yoshihiro Miyagawa

Kotaro Kudo

Shuho Iwama

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.

Silica nanoparticles for crude oil recovery using carbon dioxide, and crude oil recovery method

There is provided a highly branched hydrocarbon based surfactant for stabilizing a water/supercritical carbon dioxide microemulsion. A surfactant comprising: a sulfate compound of Formula (1):R&#x2014;OSOM&#x2003;&#x2003;(1)(where Ris a Chydrocarbon group having a branched chain; and M is a hydrogen atom, an alkali metal, ammonium, a basic amino acid residue, an alkanolamine residue having a Chydroxyalkyl group, or an aliphatic alkanolammonium) for stabilizing a water/supercritical carbon dioxide microemulsion.

Surfactant for stabilizing water/supercritical carbon dioxide microemulsion

A surfactant for water/supercritical carbon dioxide microemulsions that can achieve high water dispersion ability, water/supercritical carbon dioxide microemulsion forming ability under a moderate condition, and high water solubilization rate and that reduces burden on the environment and ecosystem. Provided are a surfactant for stabilizing a water/supercritical carbon dioxide microemulsion including a compound of Formula (I) and a water/supercritical carbon dioxide microemulsion including the surfactant. The compound of Formula (I) has the structure: 

Surfactant

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Hirosaki, Japan

Masanobu Sagisaka