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:
Mar. 05, 2013
Filed:
Apr. 28, 2010
David L. Alumbaugh, Berkeley, CA (US);
Cyrille Levesque, Sugar Land, TX (US);
Ping Zhang, Albany, CA;
Guozhong Gao, Watertown, MA (US);
David L. Alumbaugh, Berkeley, CA (US);
Cyrille Levesque, Sugar Land, TX (US);
Ping Zhang, Albany, CA;
Guozhong Gao, Watertown, MA (US);
Schlumberger Technology Corporation, Sugar Land, TX (US);
Abstract
Methods and related systems are described for analyzing electromagnetic survey data. Electromagnetic survey data of a subterranean formation is obtained using at least a downhole transceiver deployed in a borehole and a transceiver positioned on the surface, or in the same or another borehole. Limits are defined for casing correction coefficients that account for effects of the borehole casing. A constrained inversion process is performed solving for the casing correction coefficients within the defined limits, and for one or more parameters of a model representing attributes, such as resistivity, of the subterranean formation.