Table T1. Acronyms and units used for logging-while-drilling tools.
 
Tool
Output
Explanation
Unit
ADN
Azimuthal density-neutron tool

ROMT Density (rotationally processed) g/cm3

RHOB Density (average bulk density) g/cm3

TNPH Thermal neutron porosity pu

PEF Photoelectric effect b/e-




ISONIC
IDEAL sonic-while-drilling tool

DTRA Delta-time receiver array m/s

ITT integrated transit time s
RAB
Resistivity-at-the-bit tool

GR Total gamma ray API

RING Ring resistivity m

BIT Bit resistivity m

RBS Shallow-focused button resistivity m

RMS Medium-focused button resistivity m

RDS Deep-focused button resistivity m

RAB images

Quality control logs


ROP*5 5-ft averaged rate of penetration m/hr

RPMRAB Rotational speed rpm

GTAB Gamma ray time after bit min

RTAB Ring time after bit min

CHRA ISONIC coherence receiver array


ISTAB ISONIC time after bit min

DRHO Bulk density correction g/cm3

DCAL Differential caliper in

DTAB Density time after bit min

NTAB Neutron after bit min

Note: IDEAL = Anadrill Integrated Drilling and Logging system.