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:
Dec. 13, 2011
Filed:
Feb. 09, 2009
Jean-pierre Martin, Le Vaudreuil, FR;
Phillippe Broun, Saint-Egreve, FR;
Jean-paul D. Bongiraud, Varces Allieres et Risset, FR;
Vincent Bongiraud, Legal Representative, Le Villard, FR;
Jean-louis Coulomb, Saint-Ismier, FR;
Jean-Pierre Martin, Le Vaudreuil, FR;
Phillippe Broun, Saint-Egreve, FR;
Jean-Paul D. Bongiraud, Varces Allieres et Risset, FR;
Vincent Bongiraud, legal representative, Le Villard, FR;
Jean-Louis Coulomb, Saint-Ismier, FR;
Other;
Abstract
The invention concerns the methods for determining, relative to a point Po, the location of a fixing point Pf of a rod T located in an environment Mi wherein prevails a permanent magnetic field Ch. The inventive method is characterized in that it consists in studying the variations of the magnetic flux which passes through the windows F when the rod is and is not subjected to a torque about its axis A, said windows having substantially the same area and being connected to the rod T respectively in different points Px, Px+1, . . . located on the portion of the rod delimited by the assumed site of the fixing point Pf, and including the point Po, and having each a given position relative to the magnetic field lines of force when the rod is not subjected to the torque. The invention also concerns a device for implementing said method. The invention is advantageously applicable to determining the location of the sticking point of a string of hollow drill rods in an oil well.