FREMGANGSMAATE VED UTVINNING AV PETROLEUM FRA ET UNDERJORDISK RESERVOAR

TITLE: METHOD OF RECOVERING PETROLEUM FROM A SUBTERRANEAN RESERVOIR INCORPORATING A POLYETHER POLYOL A method of recovering petroleum from a subterranean reservoir preferably comprising the st:eps of: (1) introducing through an injection well a predeterminable amount of a polyether polyol having the formula: wherein: A is an alkylene oxide group, -CiH2iO-; O is oxygen; i is a positive integer from 2 to about 10 inclusive, j is a positive integer no greater than about 100; k is a positive integer no greater than about 100; N is nitrogen; R1 is one of hydrogen, a monovalent hydrocarbon group containing less than about C11, or ¢ALH!; L is a positive integer no greater than about 100; R is a hydrocarbon moiety of a non-aromatic polyol or an aromatic polyol containing only one aromatic ring, a primary or secondary amine, a primary or secondary polyamine, a primary or secondary amino alcohol, or hydrogen; and m + n is no greater than about 4 when R is other than hydrogen and one of m and n is zero and the other is unity when R is hydrogen, said polyether polyol at about 25.degree.C: (a) being less than about 1% by volume soluble in water and in isooctane; (b) having a solubllity parameter in the range of between about 6.9 and about 8.5; and (c) spreading at the interface between distilled water and refined mineral oil to form a film having a thickness no greater than about 20 Angstroms at a film pressure of about 16 dynes per cm; (2) contacting said petroleum in said reservoir with an effective thin film forming amount of said polyether polyol; and (3) introducing into the formation an aqueous injection medium to urge said petroleum toward and through a producing well. 1a