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:
Sep. 28, 1993
Filed:
Jul. 14, 1992
Robert Lockhart, Lafayette, LA (US);
Other;
Abstract
This invention discloses a method which utilizes an improved spotting fluid composition to release a stuck drill string in the bore hole of an underground formation employing an aqueous drilling fluid, the improved composition used in contacting the mud cake which has been deposited on the well bore face against which the drill string has become stuck, the improved spotting fluid composition comprising of one or more carboxylic acids with specific chemical and physical properties. The acid or acids of choice must be used in the acid form and must have a pKa value maximum of 6.5, ambiant temperature water solubility minimum of 0.5 moles per liter and must generate a maximum pH of 4.0 in water at ambiant temperature.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile