Other

Halliburton Energy Services, Inc.

Jean-Paul Bongiraud

Jean-Pierre Martin

Jean-Louis Coulomb

Phillippe Broun

Vincent Bongiraud, Legal Representative

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.

Method and device for determining the existence and location of stress-inducing forces on a rod

An apparatus comprising a probe having an elongated probe casing includes a magnetometer and a permanent magnet having a north-south magnetic axis disposed in an orientation relative to a longitudinal axis of a drill string or pipe casing when the probe is inserted into the drill string or the pipe casing. The permanent magnet is disposed in a non-vertical plane that does not contain the longitudinal axis to induce a magnetic field in the plane from the north of the magnetic axis to the south of the magnetic axis along a portion of a circumference of the drill string or the pipe casing. The magnetometer is to detect magnetization of the drill string or the pipe casing independently of movement of the permanent magnet. Additional apparatus and methods of analysis using the apparatus are disclosed.

Magnetic probe and processes of analysis

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.

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.

Method and device for determining the location of a rod fixing point

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.

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Varces Allieres et Risset, France

Jean-Paul Bongiraud