Method of enhanced oil recovery employing nitrogen injection

Details Method of enhanced oil recovery employing nitrogen injection Method of enhanced oil recovery employing nitrogen injection

1981-08-31

1984-03-06

Suchfield, George A.

Wells

Processes

Distinct, separate injection and producing wells

166268, E21B 4322

Patent

active

044348525

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.

REFERENCES:
patent: 1978655 (1934-10-01), Straight
patent: 3209824 (1965-10-01), Koch, Jr. et al.
patent: 3245467 (1968-04-01), Fitch
patent: 3386506 (1968-06-01), Quance
patent: 3811501 (1974-05-01), Burnett et al.
patent: 4299286 (1981-11-01), Alston

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