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. 15, 2008
Filed:
Feb. 01, 2006
Xiaolan Wang, Spring, TX (US);
Qi Qu, Spring, TX (US);
Mingjie KE, Spring, TX (US);
BJ Services Company, Houston, TX (US);
Abstract
A formulation containing a copolymer derived from a cationic monomer effectively inhibits and controls the formation of inorganic scales. Suitable copolymers include those comprising an acrylamide unit and a quaternary ammonium salt group, and optionally an acrylate and/or nitrogen heterocyclic monomer including those wherein the quaternary ammonium salt is a unit of the formula: wherein R is methyl or hydrogen; Ris a Cto Calkyl group, optionally substituted with halogen, hydroxyl and alkoxy groups, X is halogen; and R, Rand Rare independently selected from the group consisting of alkyl and alkoxy groups. Suitable nitrogen heterocyclic compounds include N-vinylpyrrolidone, N-vinylformamide, N-vinylacetamide, N-vinylcaprolactam, N-vinylimidazole and N-vinylpyridine. The copolymers have particular applicability in the control and inhibition of zinc sulfide or iron sulfide scales, typically formed when zinc bromide brines are used as fluids in the treatment of a gas or oil well, such as a completion fluid.