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. 19, 2006
Filed:
Sep. 17, 2002
Christian Chouzenoux, St. Cloud, FR;
Yves Manin, Le Plessis Robinson, FR;
Didier Pohl, Paris, FR;
Philippe Souhaite, Paris, FR;
Christian Chouzenoux, St. Cloud, FR;
Yves Manin, Le Plessis Robinson, FR;
Didier Pohl, Paris, FR;
Philippe Souhaite, Paris, FR;
Schlumberger Technology Corporation, Sugar Land, TX (US);
Abstract
Apparatus for monitoring an underground formation through which a borehole passes, comprises a conductive casing () located in the borehole () passing through the formation (); a plurality of sensors (-) for measuring an electrical property of the formation () located in the borehole () outside the casing () and electrically insulated therefrom; and an electrical current source () positioned in the borehole () passing through the formation () and arranged to inject a current into the formation (); the casing () having an electrically insulating coating () over the surface thereof, at least in the region of the sensors (-), and an electrically conductive portion () in electrical contact with the formation (); and a current supply () being connected to the casing () such that current flows into the formation () from the electrically conductive portion () which acts as the current source, the sensors (-) measuring the electrical property of the formation () resulting from such current flow.