Baker Hughes Corporation

Sergey Efremov

David M Schneider

Robert Alan Estes

Paul Gerard Cairns

Samuel Bell

Sassan Dehlavi

W Allen Gilchrist, Jr

Matthew John Sale

Measurements made with a nuclear logging tool are partitioned into bins to provide an energy spectrum. The energy spectrum is calibrated by maximizing a measure of similarity with a reference spectrum.

Method of calibrating multi-channel nuclear energy spectra

This invention provides a measurement-while-drilling (MWD) downhole assembly for use in drilling boreholes which utilizes directional formation evaluation devices on a rotating assembly in conjunction with toolface orientation sensors. The data from the toolface orientation sensors are analyzed by a processor and toolface angle measurements are determined at defined intervals. Formation evaluation sensors operate substantially independently of the toolface orientation sensors and measurements of the formation evaluation sensors are analyzed in combination with the determined toolface angle to obtain formation parameters.

Measurement-while-drilling assembly using real-time toolface oriented measurements

A logging-while-drilling density sensor includes a gamma ray source and at least two NaI detectors spaced apart from the source for determining measurements indicative of the formation density. An acoustic caliper is used for making standoff measurements of the NaI detectors. Measurements made by the detectors are partitioned into standoff bins. An adaptive spine and rib method uses the standoff measurements to obtain density estimates. The method of the invention may also be used with neutron porosity logging devices.

Method of processing data from a dual detector LWD density logging instrument coupled with an acoustic standoff measurement

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Houston, TX, United States of America

Sergey Efremov