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:
Jul. 28, 2026
Filed:
Jun. 12, 2025
Saudi Arabian Oil Company, Dhahran, SA;
Rajendra Arunkumar Kalgaonkar, Dhahran, SA;
Vikrant Bhavanishankar Wagle, Dhahran, SA;
Qasim Sahu, Dhahran, SA;
SAUDI ARABIAN OIL COMPANY, Dhahran, SA;
Abstract
Methods for sealing high-permeability zones in subterranean formations are disclosed. The methods involve introducing a treatment fluid comprising polyacrylamide, acid, and water into a subterranean formation containing high- and low-permeability zones. The treatment fluid preferentially enters high-permeability zones, where polyacrylamide remains inactive in acidic conditions but swells upon neutralization, thereby at least partially sealing these zones. This sealing diverts subsequent fluid flow into low-permeability zones, enhancing hydrocarbon recovery. In formations with water-producing zones, the polyacrylamide selectively absorbs water, reducing unwanted water production. The treatment fluid may also include additives such as corrosion inhibitors, intensifiers, iron stabilizers, and chelants to improve operational performance. The disclosed methods provide controlled zonal coverage and improved stimulation efficiency in carbonate reservoirs.