Electricity: measuring and testing – Of geophysical surface or subsurface in situ – By magnetic means
Reexamination Certificate
2009-02-09
2011-12-13
Aurora, Reena (Department: 2858)
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
By magnetic means
C324S209000
Reexamination Certificate
active
08076940
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.
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Bongiraud Jean-Paul D.
Bongiraud, legal representative Vincent
Broun Phillippe
Coulomb Jean-Louis
Martin Jean-Pierre
Aurora Reena
Schwegman Lundberg & Woessner, P.A.
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