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:
Apr. 02, 2002
Filed:
Nov. 24, 1998
Pabitra N. Sen, Ridgefield, CT (US);
Schlumberger Technology Corporation, Ridgefield, CT (US);
Abstract
A method for the determining a nuclear magnetic resonance characteristic of earth formations surrounding a borehole, includes the following steps: providing a logging device that is movable through the borehole, the logging device having a longitudinal axis; providing a first coil, in the logging device, for generating a magnetic field in the formations; providing a second coil in the logging device; applying a polarizing signal to the first coil; detecting, with the second coil, magnetic resonance of spins in the formations that are precessing around earth's magnetic field; and providing a third coil in the logging device, the third coil being operative to produce a further magnetic field in the borehole that reduces the contribution of spins in the borehole to the magnetic resonance detected by the second coil.