학술논문
Flooding to recover oil from subterranean formations and employing injection of hot, low-viscosity polymer solution that becomes more viscous than the oil out in the formation
Document Type
Patent
Author
Source
Patent File Date: Filed date 23 Dec 1985
Subject
Language
English
Abstract
A method is described of recovering oil from an oil-containing subterranean formation penetrated by an injection means and production means. The method comprises injecting through the injection means and into the formation at least a slug of a hot polymer solution that will reduce its viscosity at elevated temperatures and recover its viscosity when the temperature decreases. The injection is carried out through a thermally stimulated zone extending to at least five feet from the wellhead and having temperatures in the range of only a few degrees above the general formation temperature to more than 250/sup 0/F., such that the thickened aqueous polymer solution can be injected through the thermally stimulated zone without incurring significant losses in the production of oil from the production means during the injection of the polymer solution through the injection means.