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:
Dec. 07, 1982
Filed:
Jun. 30, 1980
Helmut Schulz, Harrison, NY (US);
Other;
Abstract
An enhanced petroleum oil recovery method for increasing the quantity of oil recoverable from an underground deposit thereof is provided which involves injecting into a first point in such deposit a liquid mixture of low molecular weight, light hydrocarbons; alternately reducing and raising the back pressure exerted on said deposit so as to alternately induce boiling and condensation of said light hydrocarbon mixture; recovering from a second point in said deposit under controlled back pressure a mixture of said light hydrocarbons and oil; separating the light hydrocarbons from the extracted petroleum oil by distillation; and then recycling the light hydrocarbons to the injection step. Another aspect of the invention involves utilizing the essential features thereof for the recovery of oil from oil-bearing sands, e.g. tar sands, which are mined and brought to the surface.