Wells – Processes – With indicating – testing – measuring or locating
Patent
1996-02-05
1998-02-24
Tsay, Frank
Wells
Processes
With indicating, testing, measuring or locating
1662551, 166 665, E21B 4709
Patent
active
057203458
ABSTRACT:
A borehole instrument that detects the joints of successive axial lengths of magnetic material enclosing a borehole while traveling along the inside of the enclosure by detecting anomalous magnetic fields indicative of the enclosure's joints. One embodiment of the invention is to measure the distance the instrument travels along the inside of the borehole enclosed or cased with a magnetic material by traversing along a borehole while measuring one or more magnetic field parameters interior to the enclosure of the magnetic casing, processing the measured parameters to detect anomalous static magnetic fields that are indicative of the joints of the casing lengths; determining the distance traveled along the borehole at each joint by summing the known lengths of the casing; correlating the discrete distances computed at the casing joints with a primary distance measuring device that is higher resolution but lower in accuracy, and calibrating the primary device using the discrete distances known at the casing joints. Further embodiments include detecting pre-magnetized enclosures or implanted magnetic markers.
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Price Timothy M.
Van Steenwyk Donald H.
Applied Technologies Associates, Inc.
Tsay Frank
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