دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

any of several radioactive, chemical or physical properties logs that are run in a cased hole environment. May be conveyed by electric line, coiled tubing, slick line (memory logs) or drill pipe (LWD).

n: Schlumberger/Anadrill LWD tool which combines density and neutron porosity in one tool. Useful for gas detection, porosity evaluation, and lithology determination.

n: Schlumberger/Anadrill LWD tool that measures resistivity at two depths of investigation. Also measures spectral gamma ray to give relative proportion of potassium, thorium, and uranium.

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: (LWD) logging measurements obtained by measurementwhile- drilling techniques as the well is being drilled.

n: The measurement of formation properties during the excavation of the hole, or shortly thereafter, through the use of tools integrated into the bottomhole assembly. LWD, while sometimes risky and expensive, has the advantage of measuring properties of a fo

a technique using a suite of logs that are part of the drilling BHA. The formation properties are measured while drilling (although 40 to 60 feet back from the bit) and the information is pulsed to the surface.

abbr: logging while drilling.

see Logging While Drilling.

mud operated pulse.