Schlumberger Technology Corporation

Jean-Remy Olesen

Donald Kenney Steinman

Donald C McKeon

Mehrzad Mahdavi

Hugh D Scott

George C Summerfield

A nuclear spectroscopy method and apparatus for obtaining qualitative and quantitative information related to water flow, comprising the steps of:

Nuclear oxygen activation method and apparatus for detecting and

A borehole logging method for determining thermal neutron decay characteristics of a formation surrounding the borehole, comprises the following steps. The formation surrounding the borehole is irradiated from a location within the borehole with a burst of neutrons and indications of the concentration of the diffusing thermal neutrons are detected in at least three time gates following the burst of neutrons. Corresponding count rate signals in response to the detected neutrons are produced. Thereafter, the count rate signals are combined in a predetermined manner to separate a characteristic of the thermal neutron decay rate of the formation from associated neutron diffusion characteristics which are monotonically decreasing with time. The steps of irradiating, detecting and combining are then repeated at different depth locations within the borehole and a recording of the rate of decay of thermal neutrons as a function of borehole depth is produced.

Thermal decay time logging method

A method for investigating a gravel pack located in the annulus between the tubing/screen and the casing of a borehole, comprising the steps of:

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Sugar Land, TX, United States of America

Jean-Remy Olesen