دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: the standard unit of measurement for neutron logs. Standardisation of this unit results from the calibration of each logging tool model in the API neutron test pit at the University of Houston.

n: a high-energy gamma ray emitted when the nucleus of an atom captures a neutron and becomes intensely excited. Capture gamma rays are counted by the neutron logging detector.

compensated neutron log. Radioactive neutron source bombards the formation with high energy neutrons, which are slowed and captured by atoms of the formation. The low energy neutrons are reflected back to the tool and counted. The amount of neutrons retur

n: a measure and record of limestone porosity. The log is produced using one source and two detectors instead of just one detector, as an uncompensated neutron log does. A compensated neutron log is less influenced by borehole effects than an uncompensated neutron log. See borehole effect.

n: Schlumberger/Anadrill LWD tool that bombards the formation with fast neutron. Detectors measure the slowed neutrons that are bounced back by Hydrogen atoms. Used to deduce porosity, lithology, clay analysis, and gas detection.

n: a special neutron log used mainly in air- or gas-drilled holes to help determine formation porosity. An epithermal neutron log detects epithermal neutrons, which are neutrons released at energy levels higher than those released in normal neutron logging.

formation density compensated neutron log.

n: a part of the nucleus of all atoms except hydrogen. Under certain conditions, neutrons can be emitted from a substance when its nucleus is penetrated by gamma particles from a highly radioactive source. This phenomenon is used in neutron logging.