Positioning method and tool for determining the position of the tool in a casing downhole
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United States of America Patent
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Aug 8, 2017
Grant Date -
Jun 5, 2014
app pub date -
Jul 11, 2012
filing date -
Jul 11, 2011
priority date (Note) -
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Abstract
The invention relates to a positioning method for determining a position of a downhole tool moving at a velocity in a casing in a well, comprising the steps of measuring a magnitude and/or direction of a magnetic field by means of a first sensor several times over a time period while moving along a first part of the casing manufactured from metal, determining a manufacturing pattern of the casing along the first part from the measurement measuring a magnitude and/or direction of a magnetic field by means of the first sensor several times over a time period while moving along a second part of the casing manufactured from metal, determining the velocity of the tool along the second part, adjusting the determined velocity of the tool along the second part based upon the manufacturing pattern.
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