The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 24, 1998
Filed:
Feb. 05, 1996
Timothy M Price, Templeton, CA (US);
Donald H Van Steenwyk, San Marino, CA (US);
Applied Technologies Associates, Inc., Paso Robles, CA (US);
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.