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:
Feb. 01, 2005
Filed:
Jun. 16, 2003
Roland E. Chemali, Kingwood, TX (US);
Paul Pastusek, The Woodlands, TX (US);
Friedhelm Makohl, Hermannsburg, DE;
René N. Ritter, Celle, DE;
Martin Townley Evans, Thorpe St. Andrew, GB;
Stanley T. Hewitt, Slidell, LA (US);
Roland E. Chemali, Kingwood, TX (US);
Paul Pastusek, The Woodlands, TX (US);
Friedhelm Makohl, Hermannsburg, DE;
René N. Ritter, Celle, DE;
Martin Townley Evans, Thorpe St. Andrew, GB;
Stanley T. Hewitt, Slidell, LA (US);
Baker Hughes Incorporated, Houston, TX (US);
Abstract
A method and apparatus for obtaining a resistivity measurement of an earth formation surrounding a borehole in an MWD device uses an electrode for injecting current into the earth formation and an electrode for obtaining a responsive signal from the borehole. The electrodes are located on the drill bit arm or blade. Measured resistivity values are obtained at the location of the drill bit. Measurements can be taken in both oil-based mud and water-based mud environments. Maximum or minimum resistivity can be used to best represent the resistivity of the surrounding formation.