Patent application number | Description | Published |
20100018306 | METHOD AND DEVICE FOR DETERMINING THE EXISTENCE AND LOCATION OF STRESS-INDUCING FORCES ON A ROD - The present invention relates to methods for determining the existence and location of parasitic stress-inducing forces on a substantially cylindrical rod portion | 01-28-2010 |
20100045278 | PROBE FOR ANALYSIS OF A COLLECTION OF RODS OR TUBES - The invention concerns a probe for analysis of a collection of rods or tubes comprising an elongated casing which bears, at a first end, at least one first magnetometer and, at a position sufficiently remote from the magnetometer, a permanent magnet, the north-south axis of which is perpendicular to the axis of the rods. | 02-25-2010 |
20100156403 | METHOD AND DEVICE FOR DETERMINING THE LOCATION OF THE STICKING POINT OF A ROD MADE OF MAGNETORESTRICTIVE MATERIAL LOCATED IN A WELL - The present invention relates to methods for determining the location of the sticking point Pc of a hollow rod or pipe | 06-24-2010 |
20100181994 | METHOD AND DEVICE FOR DETERMINING THE LOCATION OF A ROD FIXING POINT - 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. | 07-22-2010 |
20110227564 | PROBE FOR ANALYSIS OF A STRING OF RODS OR TUBES IN A WELL - Various embodiments comprise a probe for analysis of a collection of rods or tubes, including an elongated casing which bears, at a first end, at least one first magnetometer and, at a position sufficiently remote from the magnetometer, a permanent magnet, the north-south axis of which may be perpendicular to the axis of the rods. Additional apparatus, systems, and methods are disclosed. | 09-22-2011 |
20120313632 | METHOD AND DEVICE FOR DETERMINING THE EXISTENCE AND LOCATION OF STRESS-INDUCING FORCES ON A ROD - In various embodiments, apparatus and methods of operating the apparatus are provided to determine existence and location of parasitic stress threes on a rod portion, the rod portion made of a magnetostrictive material and having a hollow tube. The apparatus may include a device comprising an envelope made of a non-magnetic material, a magnetic field source disposed inside the envelope, a motor to set the magnetic field source in rotational motion on the inside of the envelope, and a sensor to measure a value of the magnetic field and to deliver a signal representative of the value of the magnetic field. Operation of the apparatus may include penetration of the envelope into a portion of the hollow tube of the rod portion and translation of the envelope along the portion of the hollow tube. Additional apparatus, systems, and methods are disclosed. | 12-13-2012 |
20130024146 | METHOD FOR DETERMINING THE MAGNETISATION OF THE HULL OF A SHIP, AND ASSOCIATED DEVICE - A method of taking a plurality of measurements of the magnetic field using the plurality of sensors; includes assessing the inductive magnetic excitation; and determining the likely distribution of magnetic sources on the surface of the hull by resolving a system of equations derived from modeling the physical phenomena at play, on the basis of the plurality of measurements taken and the assessed inductive magnetic excitation. The model describes the induced magnetic sources as a distribution of dipolar sources and the remanent magnetic sources as a distribution of monopolar sources. A device ( | 01-24-2013 |
20140097704 | METHOD AND SYSTEM FOR CONTROLLING THE TURN-ON TIME OF A DEVICE THAT INCLUDES A MAGNETIC CIRCUIT - The invention relates to a method and a system for controlling the switching time of a device that includes a magnetic circuit and a conductive winding. | 04-10-2014 |