ALEXANDRIA, Va., Nov. 11 -- United States Patent no. 12,466,988, issued on Nov. 11.
"Method for removing a filter cake from a borehole" was invented by Vittorio Antonio Sauro (Calgary, Canada), Alan Jones (Calgary, Canada), Vanessa Gonzalez (Calgary, Canada) and Ahmed Shahin (Calgary, Canada).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present disclosure relates to a method for removing a filter cake from a well in a subterranean formation without the need for mechanical isolation. The method comprises the steps of introducing a first alkaline aqueous fluid comprising an oxidizing agent into a borehole, introducing an activating agent selected from the group consisting of an aldehyde, a dialdehyde, a p...