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:
Aug. 25, 1987
Filed:
Jun. 20, 1986
Applicant:
Inventor:
John J Pritchard, Jr, Harvey, LA (US);
Assignee:
Shell Offshore Inc., Houston, TX (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
166365 ; 166297 ;
Abstract
A method and apparatus for abandoning an offshore oil or gas well drilled into the ocean floor having a plurality of concentric strings of pipe having throughbores and spaced to form an annular space between adjacent pipe strings. The invention includes perforating the pipe string with an explosive charge of a size, composition, and velocity so as to only penetrate one pipe string without damaging or penetrating any other pipe string in the well.