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:
Jun. 26, 2012
Filed:
May. 05, 2009
Jean-pierre Martin, Garches, FR;
Phillippe Broun, Saint-Egreve, FR;
Jean-paul Bongiraud, Varces Allieres et Risset, FR;
Vincent Bongiraud, Legal Representative, Le Villard, FR;
Jean-louis Coulomb, Saint-Ismier, FR;
Jean-Pierre Martin, Garches, FR;
Phillippe Broun, Saint-Egreve, FR;
Jean-Paul Bongiraud, Varces Allieres et Risset, FR;
Vincent Bongiraud, legal representative, Le Villard, FR;
Jean-Louis Coulomb, Saint-Ismier, FR;
Halliburton Energy Services, Inc., Houston, TX (US);
Abstract
The present invention relates to methods for determining the existence and location of parasitic stress-inducing forces on a substantially cylindrical rod portion defined along a first axis and when this rod is made of a magnetostrictive material. The method according to the invention is essentially characterized in that it consists in magnetizing the wall of the rod portion in a pseudo-helixcentered on the first axis, in applying a forced stress between the two ends of the rod portion, in measuring, along the rod portion, the magnitude of the magnetic field created by the rod portion after it has been subjected to the forced stress, these measurements being taken in a direction substantially parallel to the first axis, and from these measurements, in deducing the existence and location of the parasitic stress-inducing forces on the rod portion. The invention also relates to a device for implementing this method. Advantageous application to the determining of the location of a sticking point Pc of a hollow drill rod string which has become stuck in an oil well.