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. 24, 2009
Filed:
Dec. 20, 2006
Applicants:
Gerald Meeten, Ware, GB;
Michael Paul Barrett, Histon, GB;
Inventors:
Gerald Meeten, Ware, GB;
Michael Paul Barrett, Histon, GB;
Assignee:
Schlumberger Technology Corporation, Cambridge, MA (US);
Primary Examiner:
Int. Cl.
CPC ...
G01N 27/83 (2006.01);
U.S. Cl.
CPC ...
Abstract
A casing position locator for detecting structural features of a borehole casing, the locator including: a plurality of field generators for generating respective dynamic magnetic fields which combine to provide a dynamic test magnetic field to interact with the casing, where the test field includes a magnetic field null point located where the respective dynamic magnetic fields substantially cancel each other out; and a sensor for detecting a change in the position of the null point, relative to the sensor, due to the interaction.