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:
Dec. 01, 1987
Filed:
May. 06, 1986
Philip H Walters, Austin, TX (US);
Tensor, Inc., Round Rock, TX (US);
Abstract
A method of determining the orientation of a surveying instrument in a borehole from measurements of the earth's gravitational and magnetic fields wherein the azimuth angle is calculated directly without correcting an apparent azimuth. Those measurements are used to calculate the borehole axial magnetic component at each orientation of the surveying instrument in the borehole, and the borehole axial magnetic component is used, along with those measurements, to directly calculate the proper azimuth angle. In a preferred embodiment, measurements are taken at a plurality of orientations in the borehole and the borehole axial magnetic component is calculated in simultaneous equations and then compared to insure the accuracy of the azimuth computation at each orientation. The orientations are preferably non-colinear.