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. 01, 2025
Filed:
Apr. 08, 2024
Halliburton Energy Services, Inc., Houston, TX (US);
Hui Zhou, Houston, TX (US);
Preston Andrew May, Houston, TX (US);
Ayten Rady, Houston, TX (US);
Mohamed Metwally, Houston, TX (US);
HALLIBURTON ENERGY SERVICES, INC., HOUSTON, US;
Abstract
Drilling fluids and methods for drilling a wellbore. An example drilling fluid is a divalent brine aqueous base fluid having at least one dissolved divalent zinc salt and also a polymeric additive that is a cross-linked copolymer comprising a first comonomer of 2-acrylamido-2-methylpropanesulfonic acid in a first comonomer concentration of at least 50 mol % of the copolymer; wherein the polymeric additive additionally comprises a second comonomer comprising a N-vinyl amine-containing monomer, a terminal double bound-containing monomer, or a combination of a N-vinyl amine-containing monomer and a terminal double bound-containing monomer; wherein the second comonomer is present in a total second comonomer concentration of 50 mol % or less of the copolymer. The drilling fluid further includes a zinc solid.