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:
Aug. 09, 2022
Filed:
Jul. 24, 2019
King Fahd University of Petroleum and Minerals, Dhahran, SA;
Badr Ba Geri, Dhahran, SA;
Ibrahim Gomaa, Dhahran, SA;
Mohamed Mahmoud, Dhahran, SA;
Shirish Patil, Dhahran, SA;
KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS, Dhahran, SA;
Abstract
A method is described for removing a barite-quartz and a calcite-quartz filter cake from a well bore. The method involves contacting the filter cake with a first composition comprising NHF, NaBrO, NHCl, and NaNO. The NHCl and NaNOreact exothermically, and the heat produced drives the endothermic reaction of NHF and NaBrO, which produces HF for dissolution of the quartz in the filter cake. Filter cake comprising barite may be further treated with a second composition comprising a converting agent and a chelating agent. Filter cake comprising calcite may be treated with a first composition having an excess of NHCl and NaBrO, which react to produce HCl for calcite dissolution.