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:
Jul. 23, 2013
Filed:
Jun. 01, 2009
Neil W. Smith Bergstrom, Englewood, CO (US);
James N. Towle, Seattle, WA (US);
Matthew A. White, Templeton, CA (US);
Neil W. Smith Bergstrom, Englewood, CO (US);
James N. Towle, Seattle, WA (US);
Matthew A. White, Templeton, CA (US);
Scientific Drilling International, Inc., Houston, TX (US);
Abstract
Downhole magnetic measurement devices and methods are provided for estimation of magnetic fields during drilling. In certain embodiments, a triaxial vector magnetometer is provided and affixed to a drill string subassembly. While the drill string subassembly is rotating, as during drilling operations, an average total magnetic field value (B) is determined as an average of the instantaneous vector magnitudes of the three measured orthogonal component magnetic fields. In this way, near-bit estimates of the downhole magnetic field may be obtained and used for a variety of functions. These downhole magnetic measurement devices may be useful determining magnetic fields, and estimating borehole inclination and azimuth of drill string subassemblies during drilling operations. Additionally, downhole magnetic measurement devices may be used for detecting the presence and distance to external ferromagnetic materials. In this way, these devices may be used for various applications, including, well avoidance, well intercept, and verification of instrument integrity.