U.S. Patent No. 10,563,117 B2, entitled, “CRUDE OIL RECOVERY CHEMICAL FLUIDS” was issued to Nissan Chemical America Corporation on February 18, 2020. The inventors are John Edmond Southwell from Glen Ellyn, Illinois (US), Satoru Murakami from Chiba (JP) and Isao Oota from Chiba (JP).
A crude oil recovery chemical fluid is described and claimed. This fluid has been shown to exhibit excellent resistance to salt and high temperatures. This crude oil recovery chemical fluid includes a silane compound, an aqueous silica sol having an average particle diameter of from about 3 nm to about 200 nm, two or more anionic surfactants, and one or more nonionic surfactants.