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. 11, 2012
Filed:
Dec. 18, 2009
Richard A. Rosthal, Richmond, CA (US);
Hong Zhang, El Sobrante, CA (US);
Cyrille Levesque, La Defense, FR;
Guozhong Gao, Watertown, MA (US);
H. Frank Morrison, Berkeley, CA (US);
David Alumbaugh, Berkeley, CA (US);
Richard A. Rosthal, Richmond, CA (US);
Hong Zhang, El Sobrante, CA (US);
Cyrille Levesque, La Defense, FR;
Guozhong Gao, Watertown, MA (US);
H. Frank Morrison, Berkeley, CA (US);
David Alumbaugh, Berkeley, CA (US);
Schlumberger Technology Corporation, Sugar Land, TX (US);
Abstract
The present disclosure relates to determining attenuation factors relating to an electromagnetic signal passing through, a conductive material seen by a real sensor. A sensor is provided and disposed proximate to the material. An alternating current is passed through the sensor and the impedance of the sensor is measured. The impedance of an ideal coil is obtained from the measured impedance using electromagnetic modeling combined with a circuit analysis of the coil impedance, and the attenuation factors for the real coil in straight or feedback mode are determined by electromagnetic modeling of casing attenuation factors and impedance of an ideal coil combined with equivalent circuit modeling of the sensor transfer functions. The attenuation factors seen by the real sensor may be determined in real-time or post-survey. The material may be magnetic or non-magnetic.