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:
Mar. 06, 1984
Filed:
Aug. 31, 1981
Thomas J Morel, Houston, TX (US);
Stewart Haynes, Jr, Houston, TX (US);
Jack H Park, Houston, TX (US);
Texaco Inc., White Plains, NY (US);
Abstract
Disclosed is a process for the recovery of oil from a subterranean oil reservoir by miscible displacement using a predominantly nitrogen-containing gaseous displacing fluid which may contain lesser quantities of carbon dioxide. The miscibility of the first portion of the gaseous displacing phase injected into the formation is greater than the miscibility of the subsequent portion, as a consequence of increased concentrations of carbon dioxide and/or normally liquid hydrocarbons for the purpose of decreasing the time and distance which the gaseous nitrogen-containing displacing fluid must travel into the reservoir before attaining a conditionally miscible transition zone at reservoir conditions of temperature and pressure. The concentration of carbon dioxide and/or normally liquid hydrocarbons may be decreased in a reverse taper function, after which essentially pure nitrogen or nitrogen containing only minimal amounts of more soluble components may be injected into the formation.