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:
Aug. 11, 2026
Filed:
Jul. 05, 2024
Schlumberger Technology Corporation, Sugar Land, TX (US);
Saad Omar, Cambridge, MA (US);
Schlumberger Technology Corporation, Sugar Land, TX (US);
Abstract
Techniques and apparatus for evaluating sensor placement and frequency selection for an electromagnetic inspection tool, and determining casing count and casing sizes in a multi-casing well are described. The electromagnetic inspection tool includes a transmitter and multiple receivers configured to operate at one or more frequencies. Each receiver is located at a different spacing from the transmitter. At least one of a casing count for a well or a respective size of each casing in the well is determined using multi-frequency, non-collocated induction measurements obtained via the electromagnetic inspection tool. The size of an innermost casing may be determined based on slope(s) of high frequency response(s) at spacings in a direct coupling zone of an electromagnetic field distribution. Each size of an outer casing(s) may be determined based in part on null frequency locations within the frequency domain responses at spacings in the transition zone of the electromagnetic field distribution.