Teleco Oilfield Services Inc.

Baker Hughes Corporation

Steven Rountree

Carl Allison Perry

Guy A Daigle

Mark E Wassell

John Grunbeck

George Talmadge

Roy Nordstrom

James Tsang

Joseph Dudek, Jr

William Bruck

Leonard Goldman

A method and apparatus for nuclear logging, and in particular, neutron porosity logging is presented. In accordance with the present invention, a pair of spaced lithium detectors, preferably Li.sup.6 I crystal or Li.sup.6 doped glass are used to detect neutrons emitted from a borehole formation being logged. In addition, novel data processing is used to strip the gamma-ray peak from the spectrum developed by the lithium detectors.

Method and apparatus for nuclear logging using lithium detector

An apparatus for nuclear logging is presented. In accordance with the present invention, nuclear detectors and electronic components are all mounted in chambers within the sub wall with covers being removably attached to the chambers. A single bus for delivering both power and signals extends through the sub wall between either end of the tool. This bus terminates at a modular ring connector positioned on each tool end. This tool construction (including sub wall mounted sensors and electronics, single power and signal bus, and ring connectors) is also well suited for other formation evaluation tools used in measurement-while-drilling applications.

Apparatus for nuclear logging employing sub wall mounted detectors and

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Layafette, LA, United States of America

Steven Rountree