دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: any logging device whose operation depends on a portion of the logging tool touching the wellbore.

n: any log in which the logging sonde must be put into contact with the walls of the hole or casing to obtain the log.

n: a special radioactivity log for open-hole surveying that responds to variations in the specific gravity of formations. It is a contact log (i.e., the logging tool is held against the wall of the hole). It emits neutrons and then measures the secondary gamma radiation that is scattered back to the detector in the instrument. The density log is an excellent porosity-measure device, especially for shaley sands. Some trade names are Formation Density Log, Gamma- Gamma Density Log, and Densilog.

one of a number of logging techniques that estimate the density of the formation.

n: a hard metal pad mounted on a borehole contact logging tool that contacts the well bore and prevents wear to the rest of the tool.