A method for extracting oil from petroleum deposits with non-uniform permeability.

摘要

The invention relates to a method for the tertiary recovery of petroleum from underground petroleum deposits having a deposit temperature TL, into which at least one injection well and at least one production well are sunk, comprising at least the following method steps: i) injecting a flooding agent into the petroleum deposit through at least one injection well, wherein a formulation (F) having a temperature TF that is higher than the temperature TL is used as the flooding agent, ii) cooling the flooding agent from step i) in the petroleum deposit, and iii) injecting a further flooding agent into the petroleum deposit through at least one injection well and withdrawing petroleum through at least one production well, wherein the formulation (F) contains raw glycerin (R) having the following composition: 80 to 90 wt% glycerin, 10 to 20 wt% water, 0 to 10 wt% inorganic salts, and 0 to 1 wt% organic compounds, wherein the wt% specifications are in relation to the total weight of the raw glycerin (R).