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. 04, 2012
Filed:
May. 08, 2008
Frank Morrison, Berkeley, CA (US);
Edward Nichols, Berkeley, CA (US);
Richard A. Rosthal, Richmond, CA (US);
Hong Zhang, El Sobrante, CA (US);
Luis E. Depavia, Orinda, CA (US);
Frank Morrison, Berkeley, CA (US);
Edward Nichols, Berkeley, CA (US);
Richard A. Rosthal, Richmond, CA (US);
Hong Zhang, El Sobrante, CA (US);
Luis E. DePavia, Orinda, CA (US);
Schlumberger Technology Corporation, Sugar Land, TX (US);
Abstract
Impedances of an electromagnetic (EM) coil positioned in a well lined with an electrically conductive liner are determined. The impedances correspond to plural frequencies of operation of the EM coil. Based on the impedances of the EM coil corresponding to the plural frequencies, an attenuation factor associated with the electrically conductive liner is determined.