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:
Oct. 11, 2011
Filed:
Oct. 03, 2008
Bruce I. Girrell, Traverse City, MI (US);
Thomas A. Johnson, Kalkaska, MI (US);
Ameet V. Joshi, Traverse City, MI (US);
Douglas A. Spencer, Williamsburg, MI (US);
Bruce I. Girrell, Traverse City, MI (US);
Thomas A. Johnson, Kalkaska, MI (US);
Ameet V. Joshi, Traverse City, MI (US);
Douglas A. Spencer, Williamsburg, MI (US);
Microline Technology Corporation, Traverse City, MI (US);
Abstract
A tool disposable within a well pipe, such as for detecting a freepoint of a well pipe, includes an electromagnet capable of inducing a magnetic field within a wall of a well pipe. The tool includes a Barkhausen noise sensing device capable of sensing magnetic Barkhausen noise in response to the electromagnet inducing the magnetic field within the wall of the well pipe. The tool may be moved along the well pipe so as make two passes of the tool along the well pipe, with one pass being performed while the well pipe is less stressed and the other pass being performed while the well pipe is more stressed, with the output of the tool during a first pass being compared to the output of the tool during a second pass to determine the location of the freepoint of the well pipe.