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:
Nov. 12, 1991
Filed:
Jan. 04, 1990
Applicant:
Inventors:
Assignee:
Nowsco Well Service Ltd., Alberta, CA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
166279 ; 166300 ; 166304 ; 166307 ; 252-8553 ;
Abstract
The invention discloses a process for reducing sludging during acid treatment of an oil well by adding phosphinic acid or a soluble salt thereof and a source of cupric or cuprous ion. The addition of an iodide ion source to this combination aids its effectiveness in stronger acids.