Neil William Smith Bergstrom
Engineers at Crestridge Cir, Englewood, CO
License number
Colorado 63023
Issued Date
Jul 6, 2006
Renew Date
Jul 6, 2006
Expiration Date
Jan 18, 2007
Type
Engineer Intern
Address
Address
10909 E Crestridge Cir, Englewood, CO 80111
Professional information
Downhole Magnetic Measurement While Rotating And Methods Of Use
US Patent:
8490717, Jul 23, 2013
Filed:
Jun 1, 2009
Appl. No.:
12/475927
Inventors:
Neil W. Smith Bergstrom - Englewood CO, US
James N. Towle - Seattle WA, US
Matthew A. White - Templeton CA, US
James N. Towle - Seattle WA, US
Matthew A. White - Templeton CA, US
Assignee:
Scientific Drilling International, Inc. - Houston TX
International Classification:
E21B 47/00
US Classification:
175 40, 324346
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.