Magnetized casing string tubulars
AssigneeSmith International, Inc.
InventorsKenneth Stenerson, Leon Ceh, Graham A. McElhinney
Life of this patent
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Abstract
A stack of magnetized casing tubulars includes a plurality of magnetized wellbore tubulars each of which includes a plurality of north and south magnetic poles imparted to a corresponding plurality of longitudinal positions along the tubulars. The plurality of wellbore tubulars are arranged into a stack having at least two rows and at least two columns, the wellbore tubulars are stacked side by side and atop one another such that the magnetic poles on one tubular are radially aligned with magnetic poles of an opposite polarity on adjacent tubulars. Such a configuration advantageously substantially eliminates weakening of the imparted magnetic field due to interaction of the magnetic poles on adjacent tubulars.
Claims6
A stack of magnetized casing tubulars, the stack comprising:
- a plurality of magnetized wellbore tubulars, each of the magnetized wellbore tubulars including a plurality of north and south magnetic poles imparted to a corresponding plurality of longitudinal positions along the tubulars, the magnetic poles imparted to substantially the same longitudinal positions on each of the tubulars;
- and
- the plurality of wellbore tubulars arranged into a stack having at least two rows and at least two columns, the wellbore tubulars stacked side by side and atop one another such that the magnetic poles on one tubular are radially aligned with magnetic poles of an opposite polarity on adjacent tubulars wherein the wellbore tubulars are arranged in a substantially rectangular grid with each interior wellbore tubular having four nearest neighbors.
A method for stacking magnetized wellbore tubulars, the method comprising:
- (a) receiving a plurality of magnetized wellbore tubulars, each of the magnetized wellbore tubulars including a plurality of north and south magnetic poles imparted thereto, the magnetic poles imparted to substantially the same longitudinal positions on each of the tubulars;
- and
- (b) arranging the wellbore tubulars in a stack having at least two rows and at least two columns, the wellbore tubulars stacked side by side and atop one another such that the magnetic poles on one tubular are radially aligned with magnetic poles of an opposite polarity on adjacent tubulars wherein the wellbore tubulars are arranged in a substantially rectangular grid with each interior wellbore tubular having four nearest neighbors.
Dependencies are inferred from the claim text.