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. 02, 1993
Filed:
Oct. 29, 1990
Stanley C Gianzero, Austin, TX (US);
Roland E Chemali, Austin, TX (US);
Halliburton Logging Services, Inc., Houston, TX (US);
Abstract
A logging apparatus for measurement of earth formation resistivity is disclosed. The apparatus includes an elongated sonde having an insulated section and an electrically isolated conductive pad mounted for lateral extension into contact with a borehole wall. The electrically isolated conductive pad includes a plurality of current electrodes disposed longitudinally along the pad and a return electrode disposed on the reverse face thereof. A focussing section is utilized to provide varying depths of investigation by electrode current to preferably permit measurement of earth formation resistivity in the mudcake, flush zone, and uninvaded formation. In a preferred embodiment of the present invention, the conductive pad includes a pair of hingeably mounted sections which permit the apparatus to accommodate varying radii of curvature of boreholes.