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:
Nov. 25, 1986
Filed:
Jun. 03, 1985
Greig J Clark, Calgary, CA;
Amerigo Technology Limited, Alberta, CA;
Abstract
A method of recovering hydrocarbon from an argillaceous subterranean rock formation involving the flooding of the formation with an aqueous fluid to displace the hydrocarbon from the formation. The method involves first subjecting the formation to an acid stimulation treatment by injecting a strongly acidic solution to dissolve acid soluble pore clogging materials, although this first step can be omitted, if desired. The formation is then treated with a solution containing an acid, a surfactant and a clay stabilizing agent. The concentration of the treatment solution is initially quite high but is gradually reduced until a certain threshold concentration is reached, after which a treatment solution having this threshold concentration is continuously injected into the formation to displace the hydrocarbon. The ingredients of the treatment solution exhibit a synergistic effect in maintaining a desirable rock permeability and a favorable mobility ratio between the treatment solution and the displaced hydrocarbons.