Schlumberger Technology Corporation

Schlumberger Technology Corporation Sugar

Francoise Allioli

Christian Stoller

Marie-Laure Mauborgne

Mauro Manclossi

Fabien Haranger

Laurent Laval

Luisa Nicoletti

A method for correcting elemental yields obtained from gamma ray spectra includes acquiring a plurality of elemental yields corresponding to a plurality of time intervals; summing one of the plurality of elemental yields with an accumulated negative yield to compute a corrected yield; setting the accumulated negative yield to a minimum of zero and the computed corrected yield; resetting the corrected yield to a maximum of zero and the computed corrected yield; and repeating the summing, the setting, and the resetting, for each of the acquired plurality of elemental yields to compute a corresponding plurality of corrected elemental yields.

Out of range gamma ray elemental yield suppression

A system that may identify when a pulsed neutron generator is operating while disposed in an undesirable environment, such as in air, may include a pulsed neutron generator designed to emit neutrons in an environment. The system may also include a radiation detector designed to take measurements of the neutrons. The system may also include data processing circuitry designed to determine if the environment surrounding the pulsed neutron generator is air based at least in part on a neutron signal obtained by the radiation detector. The determination may include comparing one or more characteristics of the neutron signal with corresponding reference characteristics.

Systems and methods for detecting a neutron generator operating in air

The disclosure relates to a method for correcting a downhole natural gamma-ray measurement performed in a wellbore. A gamma-ray measurement including at least a gamma-ray count rate is obtained by a gamma-ray detector disposed in a bottom hole assembly having a mud channel inside of the assembly, such that mud flows downwards in the mud channel and upwards outside of the assembly and a neutron source situated above the gamma-ray detector and activating the mud. The method includes:

Method and system for correcting a natural gamma-ray measurement performed in a wellbore

This disclosure is related to a downhole tool to be lowered into a wellbore, having a longitudinal axis and an outer surface, the tool including:

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Clamart, France

Francoise Allioli