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:
Oct. 02, 2001
Filed:
Dec. 01, 1999
Brian Clark, Sugar Land, TX (US);
Richard A. Rosthal, Houston, TX (US);
Dean M. Homan, Sugar Land, TX (US);
Dzevat Omeragic, Sugar Land, TX (US);
Stephen D. Bonner, Sugar Land, TX (US);
Scott S. Chesser, Richmond, TX (US);
Thomas D. Barber, Houston, TX (US);
Schlumberger Technology Corporation, Sugar Land, TX (US);
Abstract
Methods and apparatus for making directional measurements of earth formations surrounding a borehole. New antenna coil shield designs are utilized to provide selective attenuation of at least one electromagnetic energy field component as the component interacts with the shield. The new shields are implemented in several downhole tool configurations to provide azimuthally focused formation measurements. In effect, the new shield filters interacting electromagnetic energy field components to pass those components corresponding to a magnetic dipole oriented at an angle from the tool axis. The shields thereby alter a coil's envelope of influence to electromagnetic energy. The new shields also form part of a system for making directional measurements while drilling.