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:
Feb. 28, 1989
Filed:
Nov. 19, 1987
Applicant:
Inventor:
Gary K Baird, Richmond, TX (US);
Assignee:
Halliburton Company, Duncan, OK (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01N / ; G01N / ; H01F / ;
U.S. Cl.
CPC ...
324221 ; 336110 ;
Abstract
For use with casing having flush joint collars, a detection system is set forth which comprises a tool body made of nonmagnetic material and enclosing abutted first, second and third permanent magnets. The magnets are axially aligned, abutted so that opposing poles are in contact with one another, thereby forming a magnetic field from the center magnet which is focused out into the metal of the casing. Separate detection coils spaced along the tool body detect signals induced by variations in magnetic reluctance as the tool traverses the cased well.